Journal articles: 'Bimetallic'

1

Yang, Chunpeng, Byung Hee Ko, Sooyeon Hwang, Zhenyu Liu, Yonggang Yao, Wesley Luc, Mingjin Cui, et al. "Overcoming immiscibility toward bimetallic catalyst library." Science Advances 6, no. 17 (April 2020): eaaz6844. http://dx.doi.org/10.1126/sciadv.aaz6844.

Full text

Abstract:

Bimetallics are emerging as important materials that often exhibit distinct chemical properties from monometallics. However, there is limited access to homogeneously alloyed bimetallics because of the thermodynamic immiscibility of the constituent elements. Overcoming the inherent immiscibility in bimetallic systems would create a bimetallic library with unique properties. Here, we present a nonequilibrium synthesis strategy to address the immiscibility challenge in bimetallics. As a proof of concept, we synthesize a broad range of homogeneously alloyed Cu-based bimetallic nanoparticles regardless of the thermodynamic immiscibility. The nonequilibrated bimetallic nanoparticles are further investigated as electrocatalysts for carbon monoxide reduction at commercially relevant current densities (>100 mA cm−2), in which Cu0.9Ni0.1 shows the highest multicarbon product Faradaic efficiency of ~76% with a current density of ~93 mA cm−2. The ability to overcome thermodynamic immiscibility in multimetallic synthesis offers freedom to design and synthesize new functional nanomaterials with desired chemical compositions and catalytic properties.

APA, Harvard, Vancouver, ISO, and other styles

2

Cao, Chong Jiang, Xiao Geng Liu, and Qin Liu. "Synthesis of Nanostructured PdMo Electrocatalysts for Oxygen Reduction Reaction in Fuel Cells." Advanced Materials Research 785-786 (September 2013): 390–94. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.390.

Full text

Abstract:

Carbon black supported Pd-Mo bimetallical nanoparticles are prepared by Strong Electrostatic Adsorption (SEA) method. A series of Pd-Mo catalysts were prepared by selective deposition of the [Pd (NH3)4]+2cationion onto the supported MoO3phase. The prepared materials are characterized by N2-BET, powder XRD and STEM. The results showed that good dispersion of bimetallic nanoparticles on the carbon support is observed from STEM images. Oxygen reduction measurements performed by linear sweep voltammetry indicat the good catalytic activity of Pd-Mo by SEA compared to dry impregnation (DI) bimetallic catalysts since the SEA technique produced more well dispersed and intimately designed bimetallic particles after reduction.

APA, Harvard, Vancouver, ISO, and other styles

3

Nogues-Marco, Pilar. "Competing Bimetallic Ratios: Amsterdam, London, and Bullion Arbitrage in Mid-Eighteenth Century." Journal of Economic History 73, no. 2 (May 23, 2013): 445–76. http://dx.doi.org/10.1017/s0022050713000326.

Full text

Abstract:

This article analyzes the stability of bimetallism for countries operating in integrated bullion markets that enact different legal ratios. I articulate a new theoretical framework to demonstrate that two countries can both be bimetallic only if they coordinate their legal ratios. The theoretical framework is applied to the mid-eighteenth century when London's legal ratio was 3.8 percent higher than that of Amsterdam. I find that Amsterdam was effectively on the bimetallic standard, whereas London was on a de facto gold standard.

APA, Harvard, Vancouver, ISO, and other styles

4

Platts, James A., Benson M. Kariuki, and Paul D. Newman. "Welcoming Neighbour or Inhospitable Host? Selective Second Metal Binding in 5- and 6-Phospha-Substituted Bpy Ligands." Molecules 29, no. 5 (March 5, 2024): 1150. http://dx.doi.org/10.3390/molecules29051150.

Full text

Abstract:

The controlled formation of mixed-metal bimetallics was realised through use of a fac-[Re(CO)3(N,N′-bpy-P)Cl] complex bearing an exogenous 2,4,6-trioxa-1,3,5,7-tetramethyl-8-phosphaadamantane donor at the 5-position of the bpy. The introduction of gold, silver, and rhodium with appropriate secondary ligands was readily achieved from established starting materials. Restricted rotation about the C(bpy)-P bond was observed in several of the bimetallic complexes and correlated with the relative steric bulk of the second metal moiety. Related chemistry with the 6-substituted derivative proved more limited in scope with only the bimetallic Re/Au complex being isolated.

APA, Harvard, Vancouver, ISO, and other styles

5

Hangargi, Sumeet. "Performance Evaluation of Bimetallic Piston." International Journal of Psychosocial Rehabilitation 24, no. 4 (April 30, 2020): 5775–81. http://dx.doi.org/10.37200/ijpr/v24i4/pr2020383.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Flandreau, Marc. "The French Crime of 1873: An Essay on the Emergence of the International Gold Standard, 1870–1880." Journal of Economic History 56, no. 4 (December 1996): 862–97. http://dx.doi.org/10.1017/s0022050700017502.

Full text

Abstract:

This article attempts to provide a new view of how the bimetallic standard was maintained before 1873 and how it came to change into a monometallic gold standard between 1870 and 1880. The conventional view that the gold standard emerged out of the contradictions of bimetallism is not persuasive. Instead, this article claims that bimetallism might have survived and provides an alternative explanation of the emergence of the gold standard. Political and historical factors proved essential in precipitating the uncoordinated emergence of the international gold standard.

APA, Harvard, Vancouver, ISO, and other styles

7

Thesner, CJ, A. Falch, G. Cornelia, and CE Van Sittert. "Using site occupation disorder to build bulk structures of Ni1-xAlx." Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie 40, no. 1 (January 24, 2022): 174–79. http://dx.doi.org/10.36303/satnt.2021cosaami.33.

Full text

Abstract:

Raney nickel shows potential as an electrocatalyst for the oxygen evolution reaction (OER). However, the catalytic activity of Raney nickel varies with its properties. These properties are related to the composition of the bimetallic precursor used to synthesise Raney nickel. The bimetallic precursor consists of a combination of bimetallic phases. Various studies have been done on the well-known bimetallic phases, namely, Ni2Al3, NiAl and NiAl3. However, to get a more comprehensive understanding of the influence of the bimetallic precursor on the properties of Raney nickel, a larger spectrum of bimetallic phases needs to be evaluated. In this study, the Site Occupation Disorder (SOD) program was used to build solid-state structures (bimetallic phases) with various Ni1-xAlx bimetallic ratios. These Ni1-xAlx bimetallic phases were evaluated, and unique configurations for each Ni1-xAlx bimetallic ratio were obtained. The unique configurations were geometrically optimised using the General Utility Lattice Program (GULP) at 0K. These optimised unique configurations were thermodynamically evaluated over a range of 0.1K – 1200K, and the most stable configurations with a probability higher than 10% were identified. This study found that the stable non-homogeneous configurations fall within a range of 20% - 80% Ni content. A weight average combination of these configurations of the bimetallic phases will produce a non-homogeneous precursor with an average Ni content of 20% - 80%, which is in close agreement with experimental results. The approach in this study enables researchers to obtain a larger, repeatable spectrum of bimetallic phases for the investigation of Raney nickel precursors.

APA, Harvard, Vancouver, ISO, and other styles

8

Guczi, L., D. Bazin, Z. Schay, and I. Kovács. "Nanoscale bimetallic catalysts: are they really bimetallic?" Surface and Interface Analysis 34, no. 1 (August 2002): 72–75. http://dx.doi.org/10.1002/sia.1255.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Verma, Alkadevi, Rajeev Kumar Gupta, Madhulata Shukla, Manisha Malviya, and Indrajit Sinha. "Ag–Cu Bimetallic Nanoparticles as Efficient Oxygen Reduction Reaction Electrocatalysts in Alkaline Media." Journal of Nanoscience and Nanotechnology 20, no. 3 (March 1, 2020): 1765–72. http://dx.doi.org/10.1166/jnn.2020.17154.

Full text

Abstract:

The alkaline medium oxygen reduction reaction (ORR) activities of Ag–Cu bimetallic nanoparticles (BNPs), consisting of neighboring Ag and Cu domains, were studied and compared with those of pure Ag and Cu nanoparticles prepared by the same polyol route. Three variations of Ag–Cu BNPs viz. Ag–Cu (4:1), Ag–Cu (2:1), Ag–Cu (1:1) BNPs were considered. The electrocatalytic performances of these nanoparticles were investigated by using different techniques, such as cyclic voltammetry (CV) and linear sweep voltammograms (LSV). The Ag–Cu bimetallics demonstrated synergistic ORR electrocatalytic activity compared to pure Ag or Cu. Optimum values of these parameters were observed for Ag–Cu (4:1) BNPs. According to LSV, the reduction peak position is at lower applied potential and showed higher intensity for the Ag–Cu (4:1) as compared to Ag–Cu (2:1) and Ag–Cu (1:1) BNPs. Density Functional Theory (DFT) calculations show that charge transfer from Cu to Ag (in the bimetallic nanoparticles) results in their stronger oxygen interaction and water activation properties relative to that of pure Ag nanoparticles.

APA, Harvard, Vancouver, ISO, and other styles

10

Sun, Zekang. "Study on manufacturing and mechanical properties of stainless-clad bimetallic steel." Applied and Computational Engineering 25, no. 1 (November 7, 2023): 83–88. http://dx.doi.org/10.54254/2755-2721/25/20230740.

Full text

Abstract:

The stainless-clad bimetallic steel not only has strong corrosion resistance, but also has low production cost and high strength. Compared with a single stainless steel or ordinary carbon steel material, the strengths of stainless-clad bimetallic steel are obvious, such as a wider market prospect and better material properties. Presently, the stainless-clad bimetallic steel has been successfully applied in the maintenance system of railway steel bridge panels and high-rise building curtain wall. In order to promote the application of stainless-clad bimetallic steel in structural engineering, this paper systematically introduces the manufacturing process of the stainless-clad bimetallic steel, including production technology and welding technology. In addition, the mechanical properties such as corrosion resistance and composite interface properties are studied and analyzed. The research of the stainless-clad bimetallic steel has important economic significance, social significance and strategic value. It is hoped that results from this paper can provide reference for researches on the stainless-clad bimetallic steel in the further.

APA, Harvard, Vancouver, ISO, and other styles

11

Zhang, Mengyang, Keyu Xu, Ning Sun, Yanling Zhuang, Longlu Wang, and Dafeng Yan. "Bimetallic Single-Atom Catalysts for Electrocatalytic and Photocatalytic Hydrogen Production." Catalysts 13, no. 11 (October 30, 2023): 1409. http://dx.doi.org/10.3390/catal13111409.

Full text

Abstract:

Electrocatalytic and photocatalytic hydrogen evolution reactions (HERs) provide a promising approach to clean energy generation. Bimetallic single-atom catalysts have been developed and explored to be advanced catalysts for HER. It is urgent to review and summarize the recent advances in developing bimetallic single-atom HER catalysts. Firstly, the fundamentals of bimetallic single-atom catalysts are presented, highlighting their unique configuration of two isolated metal atoms on their supports and resultant synergistic effects. Secondly, recent advances in bimetallic single-atom catalysts for electrocatalytic HER under acidic/alkaline conditions are then reviewed, including W-Mo, Ru-Bi, Ni-Fe, Co-Ag, and other dual-atom systems on graphene and transition metal dichalcogenides (TMDs) with enhanced HER activity versus monometallic analogs due to geometric and electronic synergies. Then, photocatalytic bimetallic single-atom catalysts on semiconducting carbon nitrides for solar H2 production are also discussed. Finally, an outlook is provided on opportunities and challenges in precisely controlling bimetallic single-atom catalyst synthesis and gaining in-depth mechanistic insights into bimetallic interactions. Further mechanistic and synthetic studies on bimetallic single-atom catalysts will be imperative for developing optimal systems for efficient and sustainable hydrogen production.

APA, Harvard, Vancouver, ISO, and other styles

12

Boltersdorf, Jonathan, Asher C. Leff, Gregory T. Forcherio, Joshua P. McClure, and Cynthia A. Lundgren. "Surface Plasmon Resonant Gold-Palladium Bimetallic Nanoparticles for Promoting Catalytic Oxidation." MRS Advances 4, no. 33-34 (2019): 1877–86. http://dx.doi.org/10.1557/adv.2019.222.

Full text

Abstract:

AbstractColloidal gold-palladium (Au-Pd) bimetallic nanoparticles were used as catalysts to study the ethanol (EtOH) photo-oxidation cycle, with an emphasis towards driving carbon-carbon (C-C) bond cleavage at low temperatures. Au-Pd bimetallic alloy and core-shell nanoparticles were prepared to synergistically couple a plasmonic absorber (Au) with a catalytic metal (Pd) with composite optical and catalytic properties tailored towards promoting photocatalytic oxidation. Catalysts utilizing metals that exhibit localized surface plasmon resonance (SPR) can be harnessed for light-driven enhancement for small molecule oxidation via augmented photocarrier generation/separation and photothermal conversion. The coupling of Au to Pd in an alloy or core-shell nanostructure maintains SPR-induced charge separation, mitigates the poisoning effects on Pd, and allows for improved EtOH oxidation. The Au-Pd nanoparticles were coupled to semiconducting titanium dioxide photocatalysts to probe their effects on plasmonically-assisted photocatalytic oxidation of EtOH. Complete oxidation of EtOH to CO2 under solar simulated-light irradiation was confirmed by monitoring the yield of gaseous products. Bimetallics provide a pathway for driving desired photocatalytic and photoelectrochemical reactions with superior catalytic activity and selectivity.

APA, Harvard, Vancouver, ISO, and other styles

13

Sinfelt, John H. "Bimetallic Catalysts." Scientific American 253, no. 3 (September 1985): 90–98. http://dx.doi.org/10.1038/scientificamerican0985-90.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Montejano-Carrizales, J. M., and J. L. Morán-López. "Bimetallic nanostructures." Surface Science 239, no. 1-2 (December 1990): 169–77. http://dx.doi.org/10.1016/0039-6028(90)90628-l.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Montejano-Carrizales, J. M., and J. L. Morán-López. "Bimetallic nanostructures." Surface Science 239, no. 1-2 (December 1990): 178–88. http://dx.doi.org/10.1016/0039-6028(90)90629-m.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Schenk, Wolfdieter A., and Thomas Gutmann. "Bimetallic complexes." Journal of Organometallic Chemistry 552, no. 1-2 (February 1998): 83–89. http://dx.doi.org/10.1016/s0022-328x(97)00582-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Gutmann, Thomas, Eberhard Dombrowski, Nicolai Burzlaff, and Wolfdieter A. Schenk. "Bimetallic complexes." Journal of Organometallic Chemistry 552, no. 1-2 (February 1998): 91–98. http://dx.doi.org/10.1016/s0022-328x(97)00583-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Fournier, René, and Sabeen Afzal-Hussain. "Bimetallic cages." Journal of Chemical Physics 138, no. 5 (February 7, 2013): 054303. http://dx.doi.org/10.1063/1.4789417.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Ismail, Wan Zakiah Wan, and Judith M. Dawes. "Synthesis and Characterization of Silver-Gold Bimetallic Nanoparticles for Random Lasing." Nanomaterials 12, no. 4 (February 11, 2022): 607. http://dx.doi.org/10.3390/nano12040607.

Full text

Abstract:

We developed rough silver-gold bimetallic nanoparticles for random lasing. Silver nanoparticles were synthesized based on a citrate-reduction method and the gold (III) chloride trihydrate was added to produce bimetallic nanoparticles. Gold atoms were deposited on the surface of the silver (Ag) through galvanic replacement reactions after the solution was stored at room temperature. Sample characterization and a spectrometry experiment were performed where bimetallic nanoparticles with nanogaps and the extinction of the nanoparticles were observed. The aim of this research is to synthesize nanoparticles for random dye laser in a weakly scattering regime. The novel bimetallic nanoparticles were added to Rhodamine 640 solution to produce random lasing. We found that random dye laser with bimetallic nanoparticles produced spectral narrowing and lasing threshold compared to random dye laser with silver nanoparticles. We attribute that to the localized surface plasmon effects which increase local electromagnetic field to provide sufficient optical gain for random lasing. The rough surface of bimetallic nanoparticles also contributes to the properties of random lasing. Thus, we suggest that the rough bimetallic nanoparticles can be used to develop random lasers.

APA, Harvard, Vancouver, ISO, and other styles

20

Patrylak, Lyubov, Oleksandra Pertko, Yuliya Voloshyna, Angela Yakovenko, Volodymyr Povazhnyi, Oleksandr Melnychuk, and Kostyantyn Zlochevskyi. "Linear Hexane Isomerization Over Bimetallic Zeolite Catalysts." Chemistry & Chemical Technology 15, no. 3 (August 15, 2021): 330–35. http://dx.doi.org/10.23939/chcht15.03.330.

Full text

Abstract:

The aim of this study was to evaluate the activity and selectivity in isomerization of n-hexane of bimetallic zeolite catalysts containing a nickel transition metal in addition to palladium. Bimetallic bifunctional linear alkane isomerization catalysts based on the hydrogen form of MFI zeolite have been synthesized. The porous properties of the samples were investigated by means of low-temperature nitrogen adsorption/desorption, the size of the metal component – by TEM, and the catalytic properties – in the micro-pulse isomerization of n-hexane. Antisymbatic correlation between the temperature of the maximum yield of hexane isomers and the amount of nickel in the sample was found for a stable palladium content. The introduction of nickel allows to reduce the optimum process temperature from 598 to 523 K.

APA, Harvard, Vancouver, ISO, and other styles

21

Halaczek, D. "Analysis of Manufacturing Bimetallic Tubes by the Cold Drawing Process." Archives of Metallurgy and Materials 61, no. 1 (March 1, 2016): 241–48. http://dx.doi.org/10.1515/amm-2016-0045.

Full text

Abstract:

Drawing processes apply to obtain the bimetallic tubes from the different metals and alloys, combined in the solid state, which significantly affects the specificity of this process. The manufacturing of bimetallic tubes by drawing process depends on many factors which include: preparation of the surface of materials joined in the solid state, the geometric parameters of the working tool, technological parameters of the drawing process (drawing speed, type of lubricant, the use of back pull etc.). Generally, the cold drawing process of producing the bimetallic tubes refers to metals which have high ductility (copper, aluminum, etc.). The tube sinking (tube drawing without a mandrel) of bimetallic tubes together with joining them at the interface of the two metal in the solid-state is applied for tubes of the diameter range between 6 to 20 mm and based on of the reducing the diameter of the tube. However, a slight increase of wall thickness ca. 0.05 ÷ 0.10 mm can appear, which is not dangerous phenomenon in case of producing the bimetallic tubes by joining in the solid-state. The aim of the research was to investigate the technology of tubes drawing process from non-ferrous metal, drawing process of bimetallic tubes and the production of bimetallic tubes in layers composition: cooper Cu-ETP - brass CuZn37 and CuZn37 brass - copper Cu-ETP in the tube sinking process. The research program included: production of bimetallic tubes with a different composition (Cu- ETP-CuZn37 and CuZn37-Cu-ETP) and a different percentage of the cross-section components; analysis of changes of tube wall thickness and the layer composition of the bimetallic tube, based on measurements on the workshop microscope; analysis of the material flow in the process of the bimetallic tubes production based on the measurements results of a profilograph CP-200.

APA, Harvard, Vancouver, ISO, and other styles

22

Zielińska-Jurek, Anna. "Progress, Challenge, and Perspective of Bimetallic TiO2-Based Photocatalysts." Journal of Nanomaterials 2014 (2014): 1–17. http://dx.doi.org/10.1155/2014/208920.

Full text

Abstract:

Bimetallic TiO2-based photocatalysts have attracted considerable attention in recent years as a class of highly active catalysts and photocatalysts under both UV and Vis light irradiation. Bimetallic noble metal structures deposited on TiO2possess the ability to absorb visible light, in a wide wavelength range (broad LSPR peak), and therefore reveal the highest level of activity as a result of utilization of a large amount of incident photons. On the other hand they can enhance the rate of trapping photoexcited electrons and inhibit the recombination process due to the capability of the storage of photoexcited electrons. Based on literature two groups of bimetallic photocatalysts were distinguished. The first group includes bimetallic TiO2photocatalysts (BMOX), highly active under UV and Vis light irradiation in a variety of oxidation reactions, and the second group presents bimetallic photocatalysts (BMRED) exceptionally active in hydrogenation reactions. This review summarizes recent advances in the preparation and environmental application of bimetallic TiO2-based photocatalysts. Moreover, the effects of various parameters such as particle shape, size, amount of metals, and calcination on the photocatalytic activity of bimetallic TiO2-based photocatalysts are also discussed.

APA, Harvard, Vancouver, ISO, and other styles

23

Jung, Hyeon, Seung Lee, Ravindranadh Koutavarapu, Sung Kim, Hyun Choi, and Myong Choi. "Enhanced Catalytic Dechlorination of 1,2-Dichlorobenzene Using Ni/Pd Bimetallic Nanoparticles Prepared by a Pulsed Laser Ablation in Liquid." Catalysts 8, no. 9 (September 10, 2018): 390. http://dx.doi.org/10.3390/catal8090390.

Full text

Abstract:

Bimetallic nanoparticles (NPs) exhibit advantageous electrical, optical, and catalytic properties. Among the various NP synthesis methods, pulsed laser ablation in liquid (PLAL) is currently attracting much attention because of its simplicity and versatility. In this study, a pulsed laser was used to produce nickel/palladium (Ni/Pd) bimetallic NPs in methanol and deionized water. The morphological and optical properties of the resulting Ni/Pd bimetallic NPs were characterized. The synthesized Ni/Pd bimetallic NPs were used for the dechlorination of 1,2-dichlorobenzene (1,2-DCB) under various conditions. The dechlorination rates of 1,2-DCB while using single (Ni and Pd) and bimetallic (Ni powder/Pd and Ni/Pd) NPs were investigated. The results showed that the Ni/Pd bimetallic NPs with 19.16 wt.% Pd exhibited much enhanced degradation efficiency for 1,2-DCB (100% degradation after 30 min). Accordingly, the results of enhanced the degradation of 1,2-DCB provide plausible mechanism insights into the catalytic reaction.

APA, Harvard, Vancouver, ISO, and other styles

24

Santoveña, A., C. Rodriguez-Proenza, J. A. Maya-Cornejo, A. Ruiz-Baltazar, D. Bahena, J. Ledesma, R. Pérez, and R. Esparza. "Characterization Microstructural and Electrochemical of AgPd Alloy Bimetallic Nanoparticles." MRS Advances 2, no. 50 (2017): 2857–63. http://dx.doi.org/10.1557/adv.2017.561.

Full text

Abstract:

ABSTRACTBimetallic nanoparticles are of special interest for their potential applications to fuel cells, among the bimetallic systems, AuPd bimetallic nanoparticles have received great interest as they can be widely used as effective catalysts for various electrochemical reactions. Monodisperse AgPd alloy nanoparticles were synthesized by polyol method using silver nitrate and potassium tetrachloropalladate(II) in ethylene glycol as the reducing agent at 160 °C. Structural, compositional and electrochemical characterizations of synthesized bimetallic nanoparticles were investigated. High-angle annular dark field scanning/transmission electron microscopy (HAADF-STEM) images and parallel beam X-ray diffraction (XRD) of the bimetallic nanoparticles were obtained. XRD and the contrast of the HAADF-STEM images show that the bimetallic nanoparticles have an alloy structure. Cyclic voltammetry was carried out in order to confirm the electrochemical responses of the AgPd/C electrocatalysts for methanol oxidation. Thanks to the narrow size distribution of the AgPd alloy bimetallic nanoparticles (9.15 nm) the supported AgPd/C electrocatalysts have high catalytic activity toward methanol electro-oxidation.

APA, Harvard, Vancouver, ISO, and other styles

25

Lee, CH, JP Park, CV Tyne, and YH Moon. "Analysis of warping during flat rolling of bimetallic slabs." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 17 (January 16, 2015): 3153–61. http://dx.doi.org/10.1177/0954406214568820.

Full text

Abstract:

The current study analyzes the warping behavior of bimetallic slabs during the flat rolling process. An analytical model that predicts the degree of warping during the rolling of bimetallic slabs is developed, based on differential bending, which occurs due to the mismatch in longitudinal elongation. The warping model focuses on the mismatch of the lengthwise elongation, due to differences in the deformation resistances of constituent materials in the bimetallic slab. With this analytical model, warping can be predicted for various processing parameters, such as initial thickness ratios and rolling reductions. To validate the model, flat rolling experiments using Al1050/Al6061 bimetallic slabs, produced by continuous clad casting, were conducted. The deformation characteristics of the bimetallic slabs during rolling were also assessed by a finite element analysis using the commercial code, FORGE™. The results from the current study show that the warping behavior of bimetallic slabs during flat rolling can be characterized with a high degree of reliability.

APA, Harvard, Vancouver, ISO, and other styles

26

Komarasamy, Mageshwari, Lei Li, Brandon Taysom, Ayoub Soulami, Glenn Grant, Darrell Herling, and Scott Whalen. "Co-Extrusion of Dissimilar Aluminum Alloys via Shear-Assisted Processing and Extrusion." Coatings 14, no. 1 (December 27, 2023): 42. http://dx.doi.org/10.3390/coatings14010042.

Full text

Abstract:

Bimetallic tubes are used when a component requires more than one performance requirement, for instance, strength/creep resistance and oxidation/corrosion resistance. Shear-assisted processing and extrusion (ShAPE) can be used to fabricate extrudates that are comparable or superior in performance relative to conventionally manufactured extrudates. For the first time, ShAPE has been successfully employed in producing bimetallic Al tubing consisting of 6061 and 7075 Al alloys. Both light and electron microscopy techniques were used to investigate the integrity of the tubes, especially the interface between the core and cladding of the bimetallic tubes. Void-free bimetallic tubes were produced using ShAPE. Quantification of tube integrity was carried out with tensile testing under as-extruded and post-aged conditions. All the bimetallic tubes in the as-extruded samples exhibited uniform elongation above 5% with good tensile strength. Key insights such as material flow during bimetallic tube extrusion were obtained from the characterization of remnant billet and simulation results from a smoothed particle hydrodynamics model.

APA, Harvard, Vancouver, ISO, and other styles

27

Szumełda, Tomasz, Alicja Drelinkiewicz, Francesco Mauriello, Maria Grazia Musolino, Anna Dziedzicka, Dorota Duraczyńska, and Jacek Gurgul. "Tuning Catalytic Properties of Supported Bimetallic Pd/Ir Systems in the Hydrogenation of Cinnamaldehyde by Using the “Water-in-Oil” Microemulsion Method." Journal of Chemistry 2019 (February 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/4314975.

Full text

Abstract:

Supported Pd/Ir bimetallic catalysts were synthesized by the “water-in-oil” microemulsion method at different precursor concentrations and characterized by XRD, XPS, SEM, TEM, and cyclic voltammetry. Depending on the preparation conditions, formation of bimetallic catalysts with different metal segregation and surface composition can be easily obtained, thus tuning the bimetallic structure of catalysts as well as their relative catalytic properties. Bimetallic Pd/Ir systems were efficiently tested in the hydrogenation of cinnamaldehyde showing a better performance than analogous monometallic catalysts.

APA, Harvard, Vancouver, ISO, and other styles

28

Sun, Lijuan, Xiaoyu Li, Zhiqiang Xu, Kenan Xie, and Li Liao. "Synthesis and catalytic application of magnetic Co–Cu nanowires." Beilstein Journal of Nanotechnology 8 (August 25, 2017): 1769–73. http://dx.doi.org/10.3762/bjnano.8.178.

Full text

Abstract:

A rapid, template-free method was developed to prepare magnetic, bimetallic Co–Cu nanowires via liquid phase reduction and metal replacement under an external magnetic field. The characterization results confirmed that the as-prepared product was bimetallic Co–Cu nanowires with a desirable linear structure. Additionally, the magnetic hysteresis loop showed that the bimetallic Co–Cu nanowires were paramagnetic, which meant they could be easily separated from the reaction mixture. Furthermore, they were applied to the hydrolysis system of ammonia borane as a catalyst for the first time. More importantly, the catalysis results showed that the bimetallic nanowires possessed appealing catalytic performance. Therefore, a rapid and facile synthesis method is introduced which is capable of preparing bimetallic Co–Cu nanowires with great potential for industrial applications.

APA, Harvard, Vancouver, ISO, and other styles

29

Vanko, Branislav, Pavol Sejč, and Zuzana Gábrišová. "Making of Bimetallic Semi-Finished Products for the Production of Elements for Joining Dissimilar Materials Using the Resistance Element Soldering." Strojnícky časopis - Journal of Mechanical Engineering 74, no. 3 (November 1, 2024): 121–30. http://dx.doi.org/10.2478/scjme-2024-0039.

Full text

Abstract:

Abstract The contribution is devoted to the making of bimetallic semi-finished products for the production of elements, which are used to joining dissimilar materials, metal sheets to plastics, using the Resistance Element Soldering. During the making of bimetallic semi-finished products by gravity casting, defects occurred and, moreover, the proposed method of casting was not very productive. Therefore, centrifugal casting of bimetallic semi-finished products was proposed, which enables the production of a larger number of semi-products with higher quality in one casting cycle. The method was verified by preparing bimetallic semi-finished products Cu-Sn91Zn9 and Cu-Sn60Pb40. The non-destructive X-ray test proved the reliability of the centrifugal casting in the serial production of high quality bimetallic semi-finished products.

APA, Harvard, Vancouver, ISO, and other styles

30

Jia, Yanlong, Huiping Qi, Mengmeng Pei, Zhenjiang Li, Fangcheng Qin, and Lu Jia. "Hot Deformation Behavior Coordination and Processing Maps of 40Cr/Q345B Bimetallic Blank by Centrifugal Casting." Metals 12, no. 8 (July 29, 2022): 1281. http://dx.doi.org/10.3390/met12081281.

Full text

Abstract:

The compact cast-rolling compound forming of bimetallic ring is an efficient process for manufacturing large bimetallic rings. The difference in hot deformation behavior of the two metals directly affects the coordinated deformation of bimetals during hot rolling. In this paper, hot compression tests of 40Cr/Q345B bimetallic blank produced by centrifugal casting were carried out at temperatures of 950–1200 °C and strain rates of 0.005–5 s−1. Based on the comparisons of flow stress behavior, activation energy, and activation volume, hot deformation behavior coordination of 40Cr/Q345B bimetallic blank was investigated. Processing maps were established to study the optimum processing windows for 40Cr/Q345B bimetallic blank. Under the same deformation conditions, 40Cr shows lower overall flow stress than Q345B, which facilitate the coordinated deformation of the bimetallic blank during rolling, and the flow stress difference between 40Cr and Q345B decreases with the increase of temperature. It was connected with the increase in the second phase particles pinning effect for higher MnS content in Q345B. The common rate-controlling mechanism for 40Cr and Q345B is the thermal breaking of attractive junctions and movement of jogged screw dislocations. The bimetallic blanks exhibit good deformation coordination in the optimum processing window (1030–1100 °C and 0.5–1 s−1 with a strain of 0.6).

APA, Harvard, Vancouver, ISO, and other styles

31

Fu, C. H., Y. M. Ge, Q. W. Zhan, A. H. Wang, J. L. Zhou, and Z. H. H. Pan. "Immobilization of erosion ions in seawater by Fe-Al bimetallic hydroxide." Digest Journal of Nanomaterials and Biostructures 17, no. 4 (October 25, 2022): 1099–109. http://dx.doi.org/10.15251/djnb.2022.174.1099.

Full text

Abstract:

Immobilization of erosion ions in seawater by Fe-Al bimetallic hydroxide was systematically analyzed. Firstly, Fe-Al bimetallic hydroxide was synthesized in the simulated solution of marine concrete crack area, and immobilization of chloride ion and sulfate ion was studied. The treatment effects of chloride ion and sulfate ion were obviously different, indicating that it had selectivity for ion immobilization. Secondly, immobilization of hydroxyl ion by bimetallic hydroxide was also demonstrated according to the high alkali environment in marine concrete crack area. The pH value of simulated solution decreased significantly, and the more solid products, the greater the decrease. Finally, microstructure and composition of Fe-Al bimetallic hydroxide was studied by SEM and EDS. The crystal presented spherical and spherical accumulation, which provided a natural place for immobilization of erosion ions. In addition to Fe, Al C, O, Na and Mg, chlorine and sulfur were found in Fe-Al bimetallic hydroxides. The simulated solution treated by Fe-Al bimetallic hydroxides was studied by FTIR. Erosion ions entered the interlayer structure of Fe-Al bimetallic hydroxide through ion exchange, while lactate ions were replaced into simulated solution. The results provided a new idea for improving the repair effect of concrete crack based on microbial mineralization.

APA, Harvard, Vancouver, ISO, and other styles

32

Dlamini, Nkosinathi Goodman, Albertus Kotze Basson, and Viswanadha Srirama Rajasekhar Pullabhotla. "Synthesis and Characterization of Various Bimetallic Nanoparticles and Their Application." Applied Nano 4, no. 1 (January 3, 2023): 1–24. http://dx.doi.org/10.3390/applnano4010001.

Full text

Abstract:

Bimetallic nanoparticles are a complex nanoscale combination of two metal constituents. The superior properties of bimetallic nanoparticles (BNPs) compared with monometallic nanoparticles have attracted much attention from both scientific and technological perspectives. In recent years, many fabrication techniques have been proposed, and the detailed characterization of bimetallic nanoparticles has been made possible by the rapid advancement of nanomaterial analysis techniques. Metallic nanoparticles can be classified according to their origin, size, and structure, and their synthesis process can be physical, chemical, or biological. Bimetallic nanoparticles are more attractive than metal nanoparticles due to their unique mixing patterns and synergistic effects of two metal nanoparticles forming the bimetal. In this review, the different bimetallic synthesis methods and various characterization techniques are discussed. The paper will also discuss various applications for bimetallic nanoparticles. Different characterization techniques for bimetallic nanoparticles include X-ray diffraction (XRD) to investigate crystallinity and phase composition; the morphology and composition analysis of nanoparticles are studied using a scanning electron microscope fitted with an energy-dispersive X-ray analyzer (EDX); transmission electron microscopy (TEM), UV–vis spectrum, FTIR, and TGA analysis are also among the characterization tools used. Finally, we report on the various applications of BNPs, which include antimicrobial activity, pollutant removal, and wastewater application.

APA, Harvard, Vancouver, ISO, and other styles

33

Dubey, Supriya, Abha Shukla, and Rishi Kumar Shukla. "Green synthesis, characterization, and biological activities of Zn, Cu monometallic and bimetallic nanoparticles using Borassus flabellifer leaves extract." Current Chemistry Letters 12, no. 4 (2023): 799–812. http://dx.doi.org/10.5267/j.ccl.2023.4.002.

Full text

Abstract:

In the present work, Zn, Cu monometallic and bimetallic nanoparticles were synthesized using leaves extract of Borassus flabellifer. Plant extract acts as both surfactant and reducing agent. The synthesized nanoparticles were characterised by UV-Vis, XRD, FESEM, EDX, and HRTEM techniques. UV-Vis spectroscopy is used to monitor the synthesis of nanoparticles. XRD technique was used to confirm the amorphous nature of nanoparticles. The FESEM images demonstrate that the shape of the nanoparticles such as Zn monometallic (pseudo-spherical), Cu monometallic (rod), Zn-Cu bimetallic are (pseudo-spherical and rod-shaped). HRTEM images show the approximate size of the Zn, Cu monometallic and Zn-Cu bimetallic nanoparticles is 3.0 nm, 3.52 nm and 2.2 nm respectively. EDX spectra confirm the presence of Zn, Cu and O in the sample. Synthesized Zn, Cu monometallic nanoparticles, and Zn-Cu bimetallic nanoparticles were used to evaluate their possible antimicrobial, antidiabetic and antioxidant properties. Bimetallic nanoparticles displayed higher antioxidant, antidiabetic, and antimicrobial properties in the comparison of monometallic nanoparticles. The results suggest that Zn-Cu bimetallic nanoparticles have greater potential than monometallic nanoparticles.

APA, Harvard, Vancouver, ISO, and other styles

34

Riaz, Tauheeda, Soha Nayyar, Tayyaba Shahzadi, Maria Zaib, Sammia Shahid, Sana Mansoor, Mohsin Javed, et al. "The Biogenic Synthesis of Cobalt Monometallic and Cobalt–Zinc Bimetallic Nanoparticles Using Cymbopogan citratus L. Leaf Extract and Assessment of Their Activities as Efficient Dye Removal and Antioxidant Agents." Agronomy 12, no. 10 (October 14, 2022): 2505. http://dx.doi.org/10.3390/agronomy12102505.

Full text

Abstract:

In this work, green synthesized cobalt monometallic and cobalt–zinc bimetallic NPs were prepared by bioreduction of metallic salts with Cymbopogan citratus plant extract. Biosynthesized cobalt nanoparticles (NPs) and cobalt–zinc bimetallic NPs were characterized using diverse techniques such as FTIR, UV-Visible spectroscopy, SEM, XRD, and EDX analyses. UV-visible spectra for green-synthesized cobalt monometallic and cobalt–zinc bimetallic NPs were in the range between 300 to 350 nm, which confirmed the formation of stable monometallic and bimetallic NPs. The average particle size of CoNPs calculated by XRD analysis was found to be 22.77 nm and that of Co-Zn BMNPs was 14.8 nm. Different functional groups in the Cymbopogan citratus plant extract, which served as a reducing and stabilizing agent for NPs, were identified by FTIR spectra. Cobalt NPs and cobalt–zinc bimetallic NPs were used in the evaluation of antioxidant, anti-inflammatory, and dye degradation activity. Green-synthesized cobalt monometallic NPs and cobalt–zinc bimetallic NPs exhibited excellent antioxidant activity with the scavenging of DPPH free radicals. Green synthesized cobalt NPs and cobalt–zinc bimetallic NPs were utilized for the removal of methylene blue (MB) dye. Different parameters such as the effect of temperature, pH, and dye concentration on adsorbent doses were analyzed and optimized. The best dye removal percentage was obtained with Co-Zn BMNPs compared with CoNPs. Cobalt NPs and cobalt–zinc bimetallic NPs did not display good anti-inflammatory activity because of the presence of secondary metabolites which inhibited them to react with proteins.

APA, Harvard, Vancouver, ISO, and other styles

35

Halaczek, Dariusz, and Eugniusz Hadasik. "The Influence of the Components of the Bimetallic Tubes for the Way of Deforming in the Hollow Drawing Process." Solid State Phenomena 246 (February 2016): 225–30. http://dx.doi.org/10.4028/www.scientific.net/ssp.246.225.

Full text

Abstract:

Processes for producing bimetallic tubes can be divided for: producing the bimetallic tubes in the cold process, with preheating or with the heat treatment after each pull. First method relates to the metal with high ductility (copper, copper alloys, aluminum, aluminum alloys, zinc, etc.), second to the metals or bi-metal components, in one of which has significantly different plastic properties from the second for example: low-carbon steel, high alloy steel, etc. One of the methods for the production of bimetallic tubes is hollow cold drawing process. In this process the wall thickness is changed, which means the wall becomes thicker, the wall becomes thinner or remains unchanged. The aim of the research was to determine the effect of the influence of the share of components of bimetallic cooper tube species M1E, and the copper tube - species M63 in the arrangement M1E - M63 and M63 - M1E in the tubes hollow drawing process for the distribution and size of deformation of the individual layers. The research program included:- production of the bimetallic tubes by hollow drawing with a different percentage of the cross-section components and with a variable arrangement of layers,- determination of the size and distribution of true strain of the individual layers on the cross-section of bimetallic tube,- determination of replacement/equivalent strain for the deformable wall of the bimetallic tube,- evaluation of the usability of the graph of changes in thickness of the tube wall in the hollow drawing process for the drawing process of the bimetallic tubes.

APA, Harvard, Vancouver, ISO, and other styles

36

Li, Fa Gen, Xun Ji Li, An Qing Fu, Ze Liang Chang, Xian Ming Li, and Quan Feng. "Technical and Economic Analysis on Bimetallic Clad Pipes for Sour Service." Materials Science Forum 944 (January 2019): 950–55. http://dx.doi.org/10.4028/www.scientific.net/msf.944.950.

Full text

Abstract:

With the development of sour gas fields in China, the problem of corrosion protection about gathering and transporting pipes used in CO2/H2S-containing condition gradually appeared, and the demand for economic and technical anticorrosion measures became more and more urgent. As we known, non-metallic material could not give consideration to performance and price, carbon steel with corrosion inhibitor was sometimes still seriously corroded and corrosion resistant alloy pipes was too expensive to use independently. Moreover, for bimetallic lined pipes it had hard to get rid of some inherent safety risks. Therefore, bimetallic clad pipes might be the best options for sour service. In order to provide theoretical basis and technical support for engineering application, taking typical sour environment as an example, fit for purpose of materials, processes and cost about bimetallic clad pipes were conducted in this paper. By analyzing materials applicable range, comparing processes reliability and sorting out anticorrosion cost, the superiority about bimetallic clad pipes would be fully demonstrated from the perspective of technology and economy. The results showed that UNS N08825 rather than non-metallic pipe, carbon steel and low alloy steel, UNS S31603 and UNS S31803 could withstand corrosion in sour environments. Additionally UNS N08825 bimetallic clad pipes are more cheaper than UNS N08825, and more reliable than bimetallic lined pipes. Meanwhile UNS N08825 bimetallic clad pipes more economic than carbon steel with corrosion inhibitor in the whole life cycle. In summary, UNS N08825 bimetallic clad pipes, which has the greatest economic and technical superiority in the whole life cycle, might be suitable for sour service.

APA, Harvard, Vancouver, ISO, and other styles

37

Hashem, Amr H., Gharieb S. El-Sayyad, Abdulaziz A. Al-Askar, Samy A. Marey, Hamada AbdElgawad, Kamel A. Abd-Elsalam, and Ebrahim Saied. "Watermelon Rind Mediated Biosynthesis of Bimetallic Selenium-Silver Nanoparticles: Characterization, Antimicrobial and Anticancer Activities." Plants 12, no. 18 (September 17, 2023): 3288. http://dx.doi.org/10.3390/plants12183288.

Full text

Abstract:

One of the most hazardous diseases that influences human health globally is microbial infection. Therefore, bimetallic nanoparticles have received much attention for controlling microbial infections in the current decade. In the present study, bimetallic selenium–silver nanoparticles (Se-Ag NPs) were effectively biosynthesized using watermelon rind WR extract through the green technique for the first time. UV-visible spectroscopy, transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX) methods were used to characterize the produced NPs. The results indicated that the bimetallic Se-Ag NPs had synergistic antimicrobial activity at low concentrations, which helped to reduce the toxicity of Ag NPs after the bimetallic Se-Ag NPs preparation and increase their great potential. Se-Ag NPs with sizes ranging from 18.3 nm to 49.6 nm were detected by TEM. Se-Ag NP surfaces were uniformly visible in the SEM picture. The cytotoxicity of bimetallic Se-Ag NPs was assessed against the Wi38 normal cell line to check their safety, where the IC50 was 168.42 µg/mL. The results showed that bimetallic Se-Ag NPs had antibacterial action against Candida albicans, Escherichia coli, Pseudomonas aeruginosa, Klebsiella oxytoca, Bacillus subtilis, and Staphylococcus aureus with a minimum inhibitory concentration (MIC) of 12.5 to 50 µg/mL. Additionally, bimetallic Se-Ag NPs had promising anticancer activity toward the MCF7 cancerous cell line, where the IC50 was 21.6 µg/mL. In conclusion, bimetallic Se-Ag NPs were biosynthesized for the first time using WR extract, which had strong antibacterial, antifungal and anticancer properties.

APA, Harvard, Vancouver, ISO, and other styles

38

Ruffino, Francesco. "Light-Scattering Simulations from Spherical Bimetallic Core–Shell Nanoparticles." Micromachines 12, no. 4 (March 26, 2021): 359. http://dx.doi.org/10.3390/mi12040359.

Full text

Abstract:

Bimetallic nanoparticles show novel electronic, optical, catalytic or photocatalytic properties different from those of monometallic nanoparticles and arising from the combination of the properties related to the presence of two individual metals but also from the synergy between the two metals. In this regard, bimetallic nanoparticles find applications in several technological areas ranging from energy production and storage to sensing. Often, these applications are based on optical properties of the bimetallic nanoparticles, for example, in plasmonic solar cells or in surface-enhanced Raman spectroscopy-based sensors. Hence, in these applications, the specific interaction between the bimetallic nanoparticles and the electromagnetic radiation plays the dominant role: properties as localized surface plasmon resonances and light-scattering efficiency are determined by the structure and shape of the bimetallic nanoparticles. In particular, for example, concerning core-shell bimetallic nanoparticles, the optical properties are strongly affected by the core/shell sizes ratio. On the basis of these considerations, in the present work, the Mie theory is used to analyze the light-scattering properties of bimetallic core–shell spherical nanoparticles (Au/Ag, AuPd, AuPt, CuAg, PdPt). By changing the core and shell sizes, calculations of the intensity of scattered light from these nanoparticles are reported in polar diagrams, and a comparison between the resulting scattering efficiencies is carried out so as to set a general framework useful to design light-scattering-based devices for desired applications.

APA, Harvard, Vancouver, ISO, and other styles

39

Akpınar, D. E., S. Dilibal, and U. Gürol. "Experimental investigation on WAAM-based functional hard-facing bimetallic part." Journal of Mining and Metallurgy, Section B: Metallurgy, no. 00 (2024): 20. http://dx.doi.org/10.2298/jmmb240505020a.

Full text

Abstract:

The traditional manufacturing of functional hard-facing bimetallic parts typically involves cladding hard-facing materials onto a base metal, a process that is often complex, costly, and time-consuming. This paper proposes utilizing the Wire Arc Additive Manufacturing (WAAM) process as an alternative approach for producing functional hard-facing bimetallic parts using hard-facing solid welding wire, with the objective of enhancing wear resistance. In this study, the hard-facing bimetallic part was built through the deposition of the Hardcor 600 G hard-facing welding wire onto the deposited 316L Si austenitic stainless steel. After the initial visual inspection and digital radiographic tests, hardness distribution was examined along with the macro and microstructural evaluations. In the subsequent analyses, tensile and Charpy V-notch tests were conducted using the extracted samples from the manufactured bimetallic part. The mechanical properties of functional hard-facing bimetallic parts revealed distinct properties across the bimetallic part, with the Hardcor 600 G side demonstrating higher strength compared to the SS 316L Si side. Additionally, the Charpy-V notch test unveiled a notable difference in impact resistance, with the SS 316L Si side being the highest, the Hardcor 600 G side the lowest, and the interface in between. Finally, the results present the WAAM process as a viable alternative for manufacturing functional hard-facing bimetallic components, particularly for applications demanding enhanced wear resistance.

APA, Harvard, Vancouver, ISO, and other styles

40

Rodríguez-Proenza, Carlos, Juan Palomares-Báez, Marco Chávez-Rojo, Amado García-Ruiz, Cristy Azanza-Ricardo, Alan Santoveña-Uribe, Gabriel Luna-Bárcenas, José Rodríguez-López, and Rodrigo Esparza. "Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles." Materials 11, no. 10 (October 2, 2018): 1882. http://dx.doi.org/10.3390/ma11101882.

Full text

Abstract:

Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts. The structures of bimetallic nanoparticles depend mainly on the synthesis conditions and the miscibility of the two components. In this work, PdPt alloyed-bimetallic nanoparticles (NPs) were synthesized through the polyol method, and characterized using spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM). High-angle annular dark-field (HAADF)-STEM images of bimetallic nanoparticles were obtained. The contrast of images shows that nanoparticles have an alloy structure with an average size of 8.2 nm. Together with the characterization of nanoparticles, a systematic molecular dynamics simulations study focused on the structural stability and atomic surface segregation trends in 923-atom PdPt alloyed-bimetallic NPs was carried out.

APA, Harvard, Vancouver, ISO, and other styles

41

Shen, Yinlong, Weiguang Gong, Baicun Zheng, and Lei Gao. "Ni-Mg Bimetallic Catalysts for Preparation of Multi-Walled Carbon Nanotubes from Polypropylene: Influence of the Ratio of Ni/Mg." Nano 11, no. 04 (April 2016): 1650044. http://dx.doi.org/10.1142/s1793292016500442.

Full text

Abstract:

This study designs Ni–Mg bimetallic catalysts for preparation of multi-walled carbon nanotubes (MWCNTs) from polypropylene (PP). The study further investigates the influence of Mg content on the catalytic activity of Ni catalyst. It is found that bimetallic Ni–Mg catalysts have higher reduction temperature, smaller Ni particle size and improved stability. Consequently, the addition of Mg not only enhances the yield of MWCNTs, but simultaneously improves the morphology and graphitization of MWCNTs. The activities of the bimetallic Ni–Mg catalysts are dependent on their composition. Among the different Ni–Mg bimetallic catalysts ration, Ni–Mg catalyst shows the highest activity when the ratio of Ni/Mg is 9/1. Moreover, the obtained MWCNTs presents smooth surface with highest graphitization degree. With our bimetallic Ni–Al catalyst, it is promising to achieve mass production of MWCNTs by using waste polymers as feedstock.

APA, Harvard, Vancouver, ISO, and other styles

42

Luo, Jun, Xiao Luo, Yonghai Gan, Xiaoming Xu, Bin Xu, Zhuang Liu, Chengcheng Ding, Yibin Cui, and Cheng Sun. "Advantages of Bimetallic Organic Frameworks in the Adsorption, Catalysis and Detection for Water Contaminants." Nanomaterials 13, no. 15 (July 28, 2023): 2194. http://dx.doi.org/10.3390/nano13152194.

Full text

Abstract:

The binary metal organic framework (MOF) is composed of two heterometallic ions bonded to an organic ligand. Compared with monometallic MOFs, bimetallic MOFs have greatly improved in terms of structure, porosity, active site, adsorption, selectivity, and stability, which has attracted wide attention. At present, many effective strategies have been designed for the synthesis of bimetallic MOF-based nanomaterials with specific morphology, structure, and function. The results show that bimetallic MOF-based nanocomposites could achieve multiple synergistic effects, which will greatly improve their research in the fields of adsorption, catalysis, energy storage, sensing, and so on. In this review, the main preparation methods of bimetallic MOFs-based materials are summarized, with emphasis on their applications in adsorption, catalysis, and detection of target pollutants in water environments, and perspectives on the future development of bimetallic MOFs-based nanomaterials in the field of water are presented.

APA, Harvard, Vancouver, ISO, and other styles

43

Sun, Yanping, Jianxin Ma, Faisal Ahmad, Yelan Xiao, Jingyang Guan, Tong Shu, and Xueji Zhang. "Bimetallic Coordination Polymers: Synthesis and Applications in Biosensing and Biomedicine." Biosensors 14, no. 3 (February 22, 2024): 117. http://dx.doi.org/10.3390/bios14030117.

Full text

Abstract:

Bimetallic coordination polymers (CPs) have two different metal ions as connecting nodes in their polymer structure. The synthesis methods of bimetallic CPs are mainly categorized into the one-pot method and post-synthesis modifications according to various needs. Compared with monometallic CPs, bimetallic CPs have synergistic effects and excellent properties, such as higher gas adsorption rate, more efficient catalytic properties, stronger luminescent properties, and more stable loading platforms, which have been widely applied in the fields of gas adsorption, catalysis, energy storage as well as conversion, and biosensing. In recent years, the study of bimetallic CPs synergized with cancer drugs and functional nanomaterials for the therapy of cancer has increasingly attracted the attention of scientists. This review presents the research progress of bimetallic CPs in biosensing and biomedicine in the last five years and provides a perspective for their future development.

APA, Harvard, Vancouver, ISO, and other styles

44

Aggarwal, Hamender Kumar, Rahul Chhibber, Navneet Arora, and Rajeev Mehta. "Experimental Analysis of Thermal Fatigue in Bimetallic Welds." Materials Science Forum 880 (November 2016): 124–27. http://dx.doi.org/10.4028/www.scientific.net/msf.880.124.

Full text

Abstract:

The bimetallic weld joints are widely utilized in the pressurized water reactors, boiling water reactors, heat exchangers in process industries, heat transport piping system utilized in nuclear plants, etc. The present study is aimed at analyzing the bimetallic weld strength degradation due to thermal fatigue. For generating thermal fatigue like conditions, an experimental test rig has been developed. The bimetallic weld between low alloy steel SA 516 grade 70 and stainless steel 304 L was prepared. The experimental results show that, heating time, notch radius and number of cycles have the effect on tensile properties of bimetallic welds.

APA, Harvard, Vancouver, ISO, and other styles

45

Wang, Qi, Qi Fei Zheng, and De Fu Li. "Development of Copper Alloy-Steel Bimetallic Bearing Materials and Manufacturing Technology." Materials Science Forum 993 (May 2020): 374–83. http://dx.doi.org/10.4028/www.scientific.net/msf.993.374.

Full text

Abstract:

Combining copper alloy with steel back to make bearing bush can not only improve the strength of bearing bush, but also prolong the life of bearing bush, which is called bimetallic bearing. In this paper, the development status of copper alloy materials in bimetallic bearing bushes and the manufacturing principle and characteristics of copper alloy-steel bimetallic bearing bushes are summarized, and the defects of several manufacturing processes are analyzed. This paper summarizes the research on improving the performance of copper-steel bimetallic bearing bush. Finally, the development direction of the preparation process of copper alloy-steel bimetal is prospected.

APA, Harvard, Vancouver, ISO, and other styles

46

Sviderskiy, S. A., O. S. Dement'eva, M. I. Ivantsov, A. A. Grabchak, M. V. Kulikova, and A. L. Maksimov. "Hydrogenation of CO2 over Biochar-Supported Catalysts." Нефтехимия 63, no. 2 (April 15, 2023): 239–49. http://dx.doi.org/10.31857/s0028242123020089.

Full text

Abstract:

The study investigates hydrogenation of CO2 over mono- and bimetallic catalysts supported on biochar. In this reaction, bimetallic iron–cobalt catalysts were shown to surpass monometallic iron and cobalt catalysts in terms of catalytic performance. The optimal combination of performance parameters was reached at an iron to cobalt ratio of 3 : 1. The composition and genesis of the active phase in the bimetallic Fe–Co catalyst were identified, and the CO2 hydrogenation mechanism was suggested for an iron-dominated bimetallic catalyst. Using biochar as a support was found to provide an active phase composition favorable for CO2 hydrogenation.

APA, Harvard, Vancouver, ISO, and other styles

47

., Sarjiyana, Subagiyo Subagiyo, and Lisa Agustriyana. "PENGARUH PENGATURAN KUAT ARUS DAN VOLTASE TERHADAP KEKUATAN TARIK PADA PENGELASAN BIMETAL PLAT BAJA KARBON RENDAH DAN STAINLESS STEEL 304 DENGAN LAS GMAW." Jurnal Energi dan Teknologi Manufaktur (JETM) 4, no. 02 (December 31, 2021): 7–12. http://dx.doi.org/10.33795/jetm.v4i02.103.

Full text

Abstract:

A manufactured product in the form of a mixture of dissimilar materials (bimetal) must be considered, including: selecting the right metal, selecting the appropriate filler, setting the current and voltage, etc. For this reason, research related to bimetallic welding using Gas Metal Arc Welding (GMAW) was conducted. The aims were to determine the effect of current on the tensile strength of bimetallic welding of low carbon steel and stainless steel 304 using GMAW welding, to determine the effect of voltage on the tensile strength of bimetallic welding, and to determine the effect of the interaction of current and voltage on the tensile strength of bimetallic welding using welding. GMAW. The research method used is experimental where the results of bimetallic welding are tested by the destructive test method. The results showed that current, voltage, and the strong interaction between current and voltage affect the tensile strength of bimetallic welding of low carbon steel and stainless steel 304 using GMAW welding. The use of amperes between 120A-160A and a voltage of 19V-22V gives a small difference and a tensile strength of 300 MPa-330 MPa.

APA, Harvard, Vancouver, ISO, and other styles

48

Lončarević, Andrea, Karla Ostojić, Inga Urlić, and Anamarija Rogina. "Preparation and Properties of Bimetallic Chitosan Spherical Microgels." Polymers 15, no. 6 (March 16, 2023): 1480. http://dx.doi.org/10.3390/polym15061480.

Full text

Abstract:

The aim of this work was to prepare bimetallic chitosan microgels with high sphericity and investigate the influences of metal-ion type and content on the size, morphology, swelling, degradation and biological properties of microgels. Amino and hydroxyl groups of chitosan (deacetylation degree, DD, of 83.2% and 96.9%) served as ligands in the Cu2+–Zn2+/chitosan complexes with various contents of cupric and zinc ions. The electrohydrodynamic atomization process was used to produce highly spherical microgels with a narrow size distribution and with surface morphology changing from wrinkled to smooth by increasing Cu2+ ions’ quantity in bimetallic systems for both used chitosans. The size of the bimetallic chitosan particles was estimated to be between 60 and 110 µm for both used chitosans, and FTIR spectroscopy indicated the formation of complexes through physical interactions between the chitosans’ functional groups and metal ions. The swelling capacity of bimetallic chitosan particles decreases as the DD and copper (II) ion content increase as a result of stronger complexation with respect to zinc (II) ions. Bimetallic chitosan microgels showed good stability during four weeks of enzymatic degradation, and bimetallic systems with smaller amounts of Cu2+ ions showed good cytocompatibility for both used chitosans.

APA, Harvard, Vancouver, ISO, and other styles

49

Бардин, Т., and В. Дробенко. "РІВНЯННЯ НЕСТАЦІОНАРНОЇ ЗАДАЧІ ТЕПЛОПРОВІДНОСТІ КОНСТРУКТИВНОГО ВУЗЛА ТЕРМОМЕТРИЧНОГО ПРИСТРОЮ СИСТЕМ ОЗБРОЄННЯ ТА ВІЙСЬКОВОЇ ТЕХНІКИ." Collection of scientific works of Odesa Military Academy, no. 20 (December 14, 2023): 101–7. http://dx.doi.org/10.37129/2313-7509.2023.20.101-107.

Full text

Abstract:

Means of contact thermometry are widely used in various complexes of devices of weapons systems and military equipment. Such means basically involve the use of mechanical contact, in particular, bimetallic temperature transmitters, which are the most widely used thermometer variants in practice. To ensure the proper level of metrological and operational characteristics of bimetallic thermometers, reliable and adequate methods of calculating thermodynamic parameters (distributions of temperature, deformations, stresses caused by force and temperature loads) of the bimetallic package are necessary. The presented work describes an approach to the calculation of non-stationary temperature distribution in a solid-state element of a complex shape, which simulates the operation of a bimetallic thermometer sensor using the contact method. The calculated dependences obtained are the basis for modeling bimetallic thermometers of various structural forms and standard sizes. In order to constructively improve the thermometric system, it is proposed to make bimetallic plates non-one-pieces, but with additional structural inclusions, in the presence of which the temperature distribution and, accordingly, the stress state will approach to uniaxial one. Keywords: differential equations, integration constants, displays of primary heat exchangers, calculation dependencies, information transfer, metrological, operational characteristics, temperature, density, thermal conductivity of the medium.

APA, Harvard, Vancouver, ISO, and other styles

50

Sawicki, Sylwester, Henryk Dyja, and Sebastian Mróz. "Metallographic Analysis of Bimetallic Ribbed Bars Produced from Feedstock Mill of the Surfacing Method TIG and of the Method ESS LM Received." Solid State Phenomena 199 (March 2013): 454–59. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.454.

Full text

Abstract:

A considerable increase in interest in using corrosion resistant steel clad ribbed bars in the construction industry has been observed in recent years. This is owing to the particular properties of these bars, namely high durability and rigidity, good mechanical properties, and high corrosion resistance. Bimetallic ribbed bars can be manufactured in medium-size and small shape mills from previously produced bimetallic feedstock. The manufacture of ribbed bars with an outer layer of corrosion-resistant steel is a complicated process that involves numerous technological problems. The most important of which include the obtaining of bimetallic feedstock with the adequate strength of the bond in the region of junction between the core and the clad layer, and assuring the even plastic flow of both bimetallic layers during the process of rolling in the elongating and forming passes in the shape Mill. Failure to meet these conditions may result in a delamination of the bimetallic band during rolling or the formation of other defects, which will disqualify the finished bimetallic bar [1÷4]. In the paper the metallographic analysis of bimetallic ribbed bars steel-steel resistant to corrosion produced from bimetallic feedstock mill of the surfacing method TIG and of the method ESS LM received. Surfacing method TIG and ESS LM method are the affirmed processes the receipt the bars plated is characterizing the large strength of bond two different metals. Moreover, in this study, the authors present the bond strength of interface of bimetallic joint of the cross section on the test bar. The core was of the constructional carbon steel C45E and the clad layer was made of the corrosion resistant steel X2CrNi18-10. Plastometric tests were performed on a Gleeble 3800 plastometer owned by the Institute of Modelling and Automation of Plastic Working Processes, using strain rates of 0.1 s-1, 1.0 s-1 and 10 s-1 respectively [1÷3, 7].

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Bimetallic'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles