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Journal articles on the topic 'Surface complexation structure'

Author: Grafiati

Published: 25 May 2024

Last updated: 19 July 2025

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1

Maldonado-Valderrama, Julia, Yan Yang, Maykel Jiménez-Guerra, Teresa del Castillo-Santaella, José Ramos, and Alberto Martín-Molina. "Complexation of DNA with Thermoresponsive Charged Microgels: Role of Swelling State and Electrostatics." Gels 8, no. 3 (2022): 184. http://dx.doi.org/10.3390/gels8030184.

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Micro- and nanogels are being increasingly used to encapsulate bioactive compounds. Their soft structure allows large loading capacity while their stimuli responsiveness makes them extremely versatile. In this work, the complexation of DNA with thermoresponsive microgels is presented. To this end, PEGylated charged microgels based on poly-N-isopropylacrylamide have been synthesized, allowing one to explore the electrostatics of the complexation. Cationic microgels complexate spontaneously by electrostatic attraction to oppositely charged DNA as demonstrated by electrophoretic mobility of the c

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Sun, Yubing, Xiangxue Wang, Wencheng Song, Songhua Lu, Changlun Chen, and Xiangke Wang. "Retracted Article: Mechanistic insights into the decontamination of Th(iv) on graphene oxide-based composites by EXAFS and modeling techniques." Environmental Science: Nano 4, no. 1 (2017): 222–32. http://dx.doi.org/10.1039/c6en00470a.

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3

Varadachari, Chandrika, Tarit Chattopadhyay, and Kunal Ghosh. "The crystallo-chemistry of oxide-humus complexes." Soil Research 38, no. 4 (2000): 789. http://dx.doi.org/10.1071/sr99053.

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Complexation of humic substances with goethite, hematite, gibbsite, and boehmite has been explained from a viewpoint of crystal structure of the minerals. Theoretical analysis of crystal surface structures revealed the following. (i) Residual charge carried by O or OH on surfaces of gibbsite is –1/2; on boehmite it is –3/2 or –1/2; on goethite it is –4/3, –2/3, or –1/3; and on hematite it is –3/2, –1, or –1/2. Cations adsorbed to neutralise these charges can form bridging links with humic acid; higher charges form stronger links. (ii) Surfaces of goethite, hematite, and gibbsite also contain o

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Dong, Yaqiong, Jianjun Liang, Zhengyang E, et al. "Preparation of biochar/iron mineral composites and their adsorption of methyl orange." RSC Advances 14, no. 46 (2024): 33977–86. http://dx.doi.org/10.1039/d4ra05529b.

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Biochar loaded with Fe-containing minerals was synthesized to enhance the adsorption of methyl orange (MO). The composites exhibited high surface area, pore structure, and adsorption sites, utilizing electrostatic attraction, complexation, π–π interactions, and hydrogen bonding.

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Sposito, Garrison. "Surface Reactions in Natural Aqueous Colloidal Systems." CHIMIA 43, no. 6 (1989): 169. https://doi.org/10.2533/chimia.1989.169.

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Natural colloids are mixtures of inorganic and organic polymers resulting from weathering processes. These materials include layer-type aluminosilicates, hydrous oxides, and biodegraded organic matter. Regardless of their molecular structure, these polymeric constituents present reactive functional groups of two principal kinds at the colloid/aqueous solution interface: siloxane ditrigonal cavities and inorganic or organic hydroxy groups. The reactive proportion of each kind of functional group at a colloid surface depends on the extent of chemical weathering and the composition of the materia

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Hiemstra, Tjisse, Rasoul Rahnemaie, and Willem H. van Riemsdijk. "Surface complexation of carbonate on goethite: IR spectroscopy, structure and charge distribution." Journal of Colloid and Interface Science 278, no. 2 (2004): 282–90. http://dx.doi.org/10.1016/j.jcis.2004.06.014.

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7

TIWARY, AMIT S., PARTHA SARATHI SENGUPTA, and ASOK K. MUKHERJEE. "MODELING THE GROUND STATE GEOMETRY AND ESTIMATING THE CHARGE TRANSFER TRANSITION ENERGY OF THE TOLUENE–ICl MOLECULAR COMPLEX BY AB INITIO AND DFT METHODS." Journal of Theoretical and Computational Chemistry 07, no. 03 (2008): 331–46. http://dx.doi.org/10.1142/s0219633608003782.

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Out of several plausible isomeric structures of the toluene–ICl charge transfer (CT) complex, the most feasible one was determined by a detailed ab initio and DFT study at the HF, B3LYP, and mPW1PW91 levels using 6-31++G(d, p) basis set. Potential energy surface scans were performed with six possible structures ( I and Cl facing the o-, m-, and p-carbon atoms of toluene separately); the structures at the local minima of the surfaces were subjected to frequency calculation and the ones having no negative frequency were accepted as the real structure in the ground state. These structures were th

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Zimmermann, C. J., N. Ryde, N. Kallay, R. E. Partch, and E. Matijević. "Plasma modification of polyvinyltoluene and polystyrene latices." Journal of Materials Research 6, no. 4 (1991): 855–60. http://dx.doi.org/10.1557/jmr.1991.0855.

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Polyvinyltoluene (PVT) latex particles were etched with O2 or CF4/O2 plasma and polystyrene (PS) latex by the O2 plasma. While the effect of these treatments on the surface topology and the specific surface area was minor, the electrokinetic measurements showed a significant change in the surface charge characteristics. The interpretation of the results in terms of a surface complexation model, taking the Stern–Gouy–Chapman structure of the interfacial layer into consideration, yielded the values of the corresponding equilibrium constants, which indicated that the chemical nature and the densi

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Wang, Kun, Yuchao Tang, Xinyu Zhang, Xianhuai Huang, and Beiping Zhang. "Study of the Reaction Mechanism of the Excessive Adsorption of Mn2+ from Water by In Situ Synthesis of MnO2@SiO2 Colloid as an Adsorbent." International Journal of Molecular Sciences 26, no. 7 (2025): 2928. https://doi.org/10.3390/ijms26072928.

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An in situ-generated MnO2@SiO2 colloidal (ISMC) composite was used for the adsorption of Mn2+ ions in water. The adsorption capacity of ISMC at a concentration of 1 mg/L at 25 °C was as high as 3017.97 mg/g for the original concentration of 50 mg/L Mn2+ ions. Material characterization revealed that it is a porous sponge with a fibrous structure with a rough surface, many folds, and abundant pores, and these features provide many adsorption sites, which are conducive to the attachment of Mn2+ ions on its surface. ISMC has an isoelectric point of 3.5, indicating a negative surface charge that fa

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10

Son, Yeongkyun, Tae-Hyun Kim, Daekeun Kim, and Yuhoon Hwang. "Porous Clay Heterostructure with Alginate Encapsulation for Toluene Removal." Nanomaterials 11, no. 2 (2021): 388. http://dx.doi.org/10.3390/nano11020388.

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A volatile organic compound adsorbent based on a porous clay heterostructure (PCH) with alginate biopolymer was successfully prepared. From N2 adsorption–desorption analysis, the specific surface area, pore volume, and pore size of bentonite were dramatically increased after introducing the porous structure. Following complexation with alginate (Alg-PCH), the pore volume and pore size were not significantly affected by pore structure. The thermal stability of Alg-PCH shows enhanced thermal stability compared to alginate and alginate beads. The morphology layered structure of Alg-PCH was carrie

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Colin-Garcia, M., A. Heredia, A. Negron-Mendoza, F. Ortega, T. Pi, and S. Ramos-Bernal. "Adsorption of HCN onto sodium montmorillonite dependent on the pH as a component to chemical evolution." International Journal of Astrobiology 13, no. 4 (2014): 310–18. http://dx.doi.org/10.1017/s1473550414000111.

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AbstractThe aim of this work is to study the behaviour of hydrogen cyanide (HCN) adsorbed onto mineral surfaces (sodium montmorillonite, a clay mineral) in different pH environments as a possible prebiotic process for complexation of organics. Our experimental results show that specific sites on the surface of the clay increased the concentration of HCN molecules dependent on the pH values. Moreover, this adsorption can occur through physical and chemical interactions enhanced by the channel structure of the sodium montmorillonite. The three-dimensional channelling structure of the clay accumu

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Larsson, Maja A., Ingmar Persson, Carin Sjöstedt, and Jon Petter Gustafsson. "Vanadate complexation to ferrihydrite: X-ray absorption spectroscopy and CD-MUSIC modelling." Environmental Chemistry 14, no. 3 (2017): 141. http://dx.doi.org/10.1071/en16174.

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Environmental contextVanadium, a metal pollutant from fossil fuels and slags, may be toxic, thereby necessitating an understanding of its environmental chemistry. One important factor that controls the mobility and bioavailability of vanadium is its binding to iron oxides. This study focuses on the characterization and modelling of vanadium adsorption onto ferrihydrite. The new model can be used to simulate the transport and bioavailability of vanadium in the environment. AbstractThe mobility of vanadium in the environment is influenced by sorption to metal (hydr)oxides, especially those conta

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de Jonge, L. W., P. Moldrup, and P. Schjønning. "Soil Infrastructure, Interfaces and Translocation Processes in Inner Space (''Soil-it-is''): towards a road map for the constraints and crossroads of soil architecture and biophysical processes." Hydrology and Earth System Sciences Discussions 6, no. 2 (2009): 2633–78. http://dx.doi.org/10.5194/hessd-6-2633-2009.

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Abstract. Soil functions and their impact on health, economy and the environment are evident at the macro scale but determined at the micro scale, based on interactions between soil micro-architecture and the transport and transformation processes occurring in the pore and particle networks and at their interfaces. Soil structure formation and its resilience to disturbance are highly dynamic features affected by management (energy input), moisture (matric potential), and solids composition and complexation (organic carbon, OC, and clay interactions). In this paper we review and put into perspe

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Gu, Zhiqiang, Qi Zhang, Guobi Sun, et al. "Pretreatment of Biogas Slurry by Modified Biochars to Promote High-Value Treatment of Wastewater by Microalgae." Sustainability 15, no. 4 (2023): 3153. http://dx.doi.org/10.3390/su15043153.

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High concentrations of contaminants such as ammonia nitrogen and organic matter in full-strength wastewater severely inhibit the growth of microalgae, contributing to lower biomass accumulation and contaminant removal efficiency. To overcome this limitation, modified biochars prepared from pine sawdust and sugarcane bagasse were used in this study as an adsorbent–desorbent for the pretreatment of wastewater to promote the growth of microalgae. The results showed that the two modification methods (acid/alkaline modification and magnesium salt modification) used in the experiment could increase

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15

Hiemstra, Tjisse, Annette Hofmann, Juan C. Mendez, and Yilina Bai. "Surface Complexation and Reactivity of Ferrihydrite in Relation to its Surface and Mineral Structure, with Applications to Natural Systems." Reviews in Mineralogy and Geochemistry 91A, no. 1 (2025): 175–227. https://doi.org/10.2138/rmg.2025.91a.06.

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Niu, Huiqun, Hongying Yang, and Linlin Tong. "Structural Characterization and Adsorption Capability of Carbonaceous Matters Extracted from Carbonaceous Gold Concentrate." Minerals 11, no. 1 (2020): 23. http://dx.doi.org/10.3390/min11010023.

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In this paper, the structures of element carbon and humic acid extracted from carbonaceous gold concentrate were characterized employing a variety of analytical methods. The extracted amounts of ECE (elemental carbon extract) and HAE (humic acid extract) were 14.84–38.50 and 11.55–28.05 mg g−1, respectively. SEM and porosity analysis indicated that ECE occurred mostly as irregular blocky particles with a mesoporous surface with the average pore diameter being 31.42 nm. The particle size of ECE was mainly ranged from 5.5 to 42 μm and the specific surface area was 20.35 m2 g−1. The physicochemic

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SHIN, DONG-MYUNG, DONG-MEE SONG, GEEWON CHUNG, and KYEONGTAE KIM. "COMPLEXATION OF AROMATIC MOLECULES WITH NEW CALIXARENE DERIVATIVES CONTAINING TWO ARYL SULFIDE RINGS." Journal of Nonlinear Optical Physics & Materials 14, no. 04 (2005): 513–20. http://dx.doi.org/10.1142/s0218863505002967.

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The cuplike structure of calix[4]arenes is one of the most attractive features, which has been observed both in the solid state and in solution. The newly synthesized 5,11,17,23-tetrakis(3-mercaptopropyl)calix[4]arene (1) and 25,26,27,28-tetrakis(5-mercaptopenthoxy)calix[4]arene containing aryl sulfide rings (2), have four alkyl thiol linkages, which allow the calixarenes to attach onto the gold surface. Surface plasmon resonance (SPR) spectroscopy allows us to monitor the binding of calixarene derivatives on the gold surface. The 1 and 2 bind very effectively on the gold surface and self-asse

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18

Ashrafi, Frydon, Tahereh Mahbobi, and Ashraf Sadat Ghasemi. "Computational study adsorption of mercaptopurine in generation G3 and G5 PAMAM dendrimers." Ciência e Natura 37 (December 21, 2015): 12. http://dx.doi.org/10.5902/2179460x20822.

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Due to its unique properties of dendrimers as well as with high-level groups, a special ability to carry drugs. In this study compared the interaction between the two generations of poly (amidoamine) PAMAM (G3and G5) dendrimers and the drug 6-mercaptopurine (6-MP) and the drug entrapment within the structure of dendrimers the electrostatic and covalent complexation of drugs to the dendrimer surface have been studied. The use of drug-dendrimer complex enhanced drug solubility and bioavailability of the drug.

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19

Issaoui, Chokri, Hammouda Chebbi, Khaled Alouani, and Abderrahmen Guesmi. "Crystal structure and Hirshfeld surface analysis of the new cyclodiphosphazane [EtNP(S)NMe2]2." Acta Crystallographica Section E Crystallographic Communications 73, no. 5 (2017): 682–86. http://dx.doi.org/10.1107/s2056989017005187.

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The cyclic compound 2,4-bis(dimethylamino)-1,3-diethylcyclodiphosphazane-2,4-dithione [systematic name: 2,4-bis(dimethylamino)-1,3-diethyl-1,3,2λ5,4λ5-diazadiphosphetidine-2,4-dithione], C8H22N4P2S2or [EtNP(S)NMe2]2, is member of a class of molecules that may be used, by virtue of their complexation properties, for the extraction of metals. This compound was characterized in solution by (1H and31P) NMR, and in the solid state by energy-dispersive X-ray spectroscopy (EDX) and by X-ray crystallography. In the crystal, the molecule sits on an inversion centre such that the P and N atoms form a ce

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Levourch, Gaëlle, Noureddine Lebaz, and Abdelhamid Elaissari. "Hydrophilic Submicron Nanogel Particles for Specific Recombinant Proteins Extraction and Purification." Polymers 12, no. 6 (2020): 1413. http://dx.doi.org/10.3390/polym12061413.

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In biomedical diagnosis and bionanotechnologies, the extraction and purification of proteins and protein derivatives are of great interest. In fact, to purify recombinant proteins for instance, new methodologies and well appropriate material supports need to be established and also to be evaluated. In this work, hydrophilic nanohydrogel particles were prepared for recombinant proteins extraction for purification purpose. The prepared nanohydrogel polymer-based particles are hydrophilic below the volume phase transition temperature (TVPT) and dehydrated above the TVPT, due to the thermally sens

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21

DAI, WEI, RUI LI, HAIQIN JIN, and SHIFANG WANG. "MOLECULAR SIMULATION OF HYDROGEN ADSORPTION IN ALUMINUM ORGANIC FRAMEWORK." Modern Physics Letters B 27, no. 13 (2013): 1350095. http://dx.doi.org/10.1142/s0217984913500954.

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With the aid of molecular simulations, a new aluminum organic framework structure is designed, and the hydrogen storage capability of the designed structure is studied using grand canonical Monte Carlo technique. Results show that the hydrogen storage capacity of aluminum organic framework at 77 K and 1 MPa is about 430 hydrogen molecules per unit cell, the corresponding weight density be equivalent to 17.45 wt.%. The preferential adsorption site is located at the aluminum–oxygen cluster. Hydrogen molecules are preferentially distributed on the surface of Al ions. The complexation of organic l

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Grama, Lavinia, Daniela-Lucia Muntean, and A. Curticăpean. "Unsaturated Heteropolyoxotungstates with Platinum Cation Complexation." Acta Medica Marisiensis 60, no. 2 (2014): 34–36. http://dx.doi.org/10.2478/amma-2014-0007.

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Abstract Background: Polyanions are a special category of coordination compounds with a large development in last years. By coordination of metal oxoions at the lacunary polyoxometalates are obtained new compounds which are studied for theirs possible antitumoral and antiviral activities. The polyoxometalates can bind cations by oxygen atoms from their saturated surface structure or by embedding in vacant sites. Material and method: The methods used for determining cation coordination with the unsaturated polyoxotungstate are spectrophotometry and conductometry. The solutions used in this stud

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Bharadwaj, Namita, and Jaishri Kaushik. "Nano Synthesis and Characterization of Complex Derived from Silver Metal Conjugated with Midodrine Hydrochloride." Oriental Journal Of Chemistry 37, no. 1 (2021): 157–61. http://dx.doi.org/10.13005/ojc/370121.

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The stability constant Kf for the complexation of Ag(Ⅰ) metal ion with Midodrine hydrochloride were determinedby spectrophotometric method at room temperature .The colored complexes were measured at 300 nm. The stability constant of the complexes were found to be 5.47 by mole ratio method. The stoichiometry of the complexes formed between the Midodrine drug and Ag (Ⅰ) metal ion are 1:1 M/L ratio. Silver conjugated Midodrine hydrochloride Nano synthesized and characterized by UV/Visible spectroscopy, SEM, XRD and FT-IR. The UV/Visible spectra of Midodrine –Ag nanoparticle in the range of 322 nm

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Sharma, Rakesh K. "Design, synthesis, and application of chelating polymers for separation and determination of trace and toxic metal ions. A green analytical method." Pure and Applied Chemistry 73, no. 1 (2001): 181–86. http://dx.doi.org/10.1351/pac200173010181.

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A green analytical method was developed for separation and preconcentration of trace amounts of copper from aqueous samples using aurin tricarboxylic acid-immobilized silica gel (ATA-SG). This was done by determining chemical speciation and stability constant of Cu-ATA complex. The pH-metric studies indicate strong complexation of Cu with ATA (log bCu2ATA = 19.56). Species distribution curve for Cu-ATA complex indicates almost 100% complexation of copper, with ATA forming Cu2ATA as the predominant species. Considering the selectivity and strong interaction of ATA toward copper, ATA was immobil

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Hiemstra, Tjisse, and Johannes Lützenkirchen. "Development and Modus Operandi relating Surface Structure and Ion Complexation Modeling for Important Metal (Hydr)oxides." Reviews in Mineralogy and Geochemistry 91A, no. 1 (2025): 13–84. https://doi.org/10.2138/rmg.2025.91a.02.

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Zuo, Youming, Zirui He, Weidong Yang, et al. "Preparation of Neohesperidin–Taro Starch Complex as a Novel Approach to Modulate the Physicochemical Properties, Structure and In Vitro Digestibility." Molecules 28, no. 9 (2023): 3901. http://dx.doi.org/10.3390/molecules28093901.

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Neohesperidin (NH), a natural flavonoid, exerts multiple actions, such as antioxidant, antiviral, antiallergic, vasoprotective, anticarcinogenic and anti-inflammatory effects, as well as inhibition of tumor progression. In this study, the NH–taro starch complex is prepared, and the effects of NH complexation on the physicochemical properties, structure and in vitro digestibility of taro starch (TS) are investigated. Results showed that NH complexation significantly affected starch gelatinization temperatures and reduced its enthalpy value (ΔH). The addition of NH increased the viscosity and th

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Rakhmonova, Dilnoza, Lobar Gapurova, Surayyo Razzoqova, et al. "5-Amino-1H-benzimidazole-2(3H)-thione: molecular, crystal structure and Hirshfeld surface analysis." Acta Crystallographica Section E Crystallographic Communications 78, no. 2 (2022): 231–34. http://dx.doi.org/10.1107/s2056989022000792.

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The title compound, C7H7N3S, which has potential biological activity, can be used as a ligand in metal complexation. This compound exists as the thione tautomer in the crystal phase, which is confirmed by the study of its molecular structure. The amino group has pyramidal configuration. In the crystal phase, the two independent molecules in the asymmetric unit form tetramers as a result of N—H...S hydrogen bonds. These tetramers are linked by N—H...N hydrogen bonds, forming chains/tubes in the [010] direction. The Hirshfeld surface analysis showed that the highest contribution to the total sur

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Wang, Ning, Huihui Du, Qiaoyun Huang, et al. "Surface complexation modeling of Cd(II) sorption to montmorillonite, bacteria, and their composite." Biogeosciences 13, no. 19 (2016): 5557–66. http://dx.doi.org/10.5194/bg-13-5557-2016.

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Abstract. Surface complexation modeling (SCM) has emerged as a powerful tool for simulating heavy metal adsorption processes on the surface of soil solid components under different geochemical conditions. The component additivity (CA) approach is one of the strategies that have been widely used in multicomponent systems. In this study, potentiometric titration, isothermal adsorption, zeta potential measurement, and extended X-ray absorption fine-structure (EXAFS) spectra analysis were conducted to investigate Cd adsorption on 2 : 1 clay mineral montmorillonite, on Gram-positive bacteria Bacill

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Topuz, Fuat, and Tamer Uyar. "Electrospinning of Cyclodextrin Functional Nanofibers for Drug Delivery Applications." Pharmaceutics 11, no. 1 (2018): 6. http://dx.doi.org/10.3390/pharmaceutics11010006.

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Electrospun nanofibers have sparked tremendous attention in drug delivery since they can offer high specific surface area, tailored release of drugs, controlled surface chemistry for preferred protein adsorption, and tunable porosity. Several functional motifs were incorporated into electrospun nanofibers to greatly expand their drug loading capacity or to provide the sustained release of the embedded drug molecules. In this regard, cyclodextrins (CyD) are considered as ideal drug carrier molecules as they are natural, edible, and biocompatible compounds with a truncated cone-shape with a rela

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Simon Justin, A., P. Vickraman, and B. Joji Reddy. "Investigation on Carbonsphere@Nickel Cobalt Sulfide Core-shell Nanocomposite for Asymmetric Supercapacitor Application." Energy Harvesting and Systems 6, no. 1-2 (2019): 1–13. http://dx.doi.org/10.1515/ehs-2019-0003.

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Abstract The carbon sphere (CS)@nickel cobalt sulfide core-shell nanocomposite at five different mole ratios have been synthesized by a facile low-temperature water-bath method without any thermal treatment. The XRD results on CS, NiCo2S4 and its ternary complexation confirms nanocomposite formation which matches with the cubic structure. The FTIR confirms the complexation of CS and metal-sulfide core-shell. TEM morphology shows CS at NiCo2S4 forming a core-shell which appears as interlinked bunch of grapes. The BET surface analysis observes the high surface area for the core-shell. The XPS st

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Verma, Parveen Kumar, and Prasanta Kumar Mohapatra. "Luminescence spectroscopic investigations of europium complexes formed in the kaolinite-humic acid/citric acid systems." Radiochimica Acta 108, no. 11 (2020): 859–71. http://dx.doi.org/10.1515/ract-2019-3148.

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AbstractIn the present study, the nature of Eu(III) complexes (Eu(III) was used as a surrogate for Am(III)) formed in kaolinite–humic acid (HA)/citric acid (CA) system was investigated by luminescence spectroscopy. In addition to the ternary system (kaolinite + Eu + L(CA/HA)), the binary system (Eu-L) was also looked at for a better understanding of the complexes formed at the kaolinite surface. The lifetime and emission spectra of Eu-L complexes on the kaolinite surface differ considerably as compared to the same in the aqueous phase. The Eu-HA aqueous complexation shows differences in the ex

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de Jonge, L. W., P. Moldrup, and P. Schjønning. "Soil Infrastructure, Interfaces & Translocation Processes in Inner Space ("Soil-it-is"): towards a road map for the constraints and crossroads of soil architecture and biophysical processes." Hydrology and Earth System Sciences 13, no. 8 (2009): 1485–502. http://dx.doi.org/10.5194/hess-13-1485-2009.

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Abstract. Soil functions and their impact on health, economy, and the environment are evident at the macro scale but determined at the micro scale, based on interactions between soil micro-architecture and the transport and transformation processes occurring in the soil infrastructure comprising pore and particle networks and at their interfaces. Soil structure formation and its resilience to disturbance are highly dynamic features affected by management (energy input), moisture (matric potential), and solids composition and complexation (organic matter and clay interactions). In this paper we

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Ding, Jiajia, Yu Tian, Tao Lu, and Jiang Kang. "Study on the adsorption of heavy metals by biochar modified with different modifiers under room temperature." E3S Web of Conferences 293 (2021): 03014. http://dx.doi.org/10.1051/e3sconf/202129303014.

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In order to obtain an environment-friendly biochar adsorption material with excellent adsorption performance, the biochar made from corn straw was modified with FeCl3, Na2S and KMnO4 as modifiers, and the adsorption effect of biochar on several heavy metal ions in water before and after modification was studied. The properties of biochar before and after modification were characterized by SEM, XRD, FTIR and BET, and the adsorption mechanism was discussed. The results showed that the three modified reagents could effectively improve the adsorption capacity of biochar for three heavy metal ions

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Yin, Zhou, Johannes Lützenkirchen, Nicolas Finck, Noémie Celaries, Kathy Dardenne, and Hans Chr Bruun Hansen. "Adsorption of arsenic(V) onto single sheet iron oxide: X-ray absorption fine structure and surface complexation." Journal of Colloid and Interface Science 554 (October 2019): 433–43. http://dx.doi.org/10.1016/j.jcis.2019.07.024.

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Chroni, Angeliki, Aleksander Forys, Barbara Trzebicka, Adam Alemayehu, Vaclav Tyrpekl, and Stergios Pispas. "Poly[oligo(ethylene glycol) methacrylate]-b-poly[(vinyl benzyl trimethylammonium chloride)] Based Multifunctional Hybrid Nanostructures Encapsulating Magnetic Nanoparticles and DNA." Polymers 12, no. 6 (2020): 1283. http://dx.doi.org/10.3390/polym12061283.

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We report on the preparation of novel and multifunctional hybrid spherical-shaped nanostructures involving a double-hydrophilic block copolymer, namely the neutral cationic poly[oligo(ethylene glycol) methacrylate]-b-poly[(vinyl benzyl trimethylammonium chloride)] (POEGMA-b-PVBTMAC) diblock copolymer, initially complexed with hydrophilic anionic magnetic nanoparticles (MNPs), and subsequently, with short deoxyribonucleic acid (113 bases DNA). The POEGMA-b-PVBTMAC copolymer, the copolymer/MNPs and the copolymer/MNPs/DNA tricomponent hybrid electrostatic complexes were studied by dynamic/electro

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Xing, Zhaoliang, Chong Zhang, Naifan Xue, et al. "High-Frequency Surface Insulation Strength with Nanoarchitectonics of Disiloxane Modified Polyimide Films." Polymers 14, no. 1 (2021): 146. http://dx.doi.org/10.3390/polym14010146.

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High-frequency power transformers are conducive to the reliable grid connection of distributed energy sources. Polyimide is often used for the coating insulation of high-frequency power transformers. However, creeping discharge will cause insulation failure, therefore, it is necessary to use disiloxane for the purpose of modifying the molecular structure of polyimide. This paper not only introduces 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane (GAPD) with a molar content of 1%, 2%, and 5% to polyimide, but also tests both the physical and chemical properties of the modified film and the

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Bystrický, Slavomír, Anna Malovíková, Tibor Sticzay, and Karel Bláha. "Complexation of poly(Lys-Ala) and poly(Lys-Ala-Ala-Ala) with pectins and potassium oligogalacturonates." Collection of Czechoslovak Chemical Communications 53, no. 11 (1988): 2833–42. http://dx.doi.org/10.1135/cccc19882833.

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The selected model polypeptides poly(Lys-Ala) and poly(Lys-Ala-Ala-Ala) underwent a helix-forming interaction with potassium pectates and pectinates of various esterification degree (E) and with some potassium oligogalacturonates (n = 2-5, 9, 13). Formation of the complex quantitatively monitored by a circular dichroic measurement showed that the specific band distribution of charged side chains of lysine units at the surface of helical structure does not constitute grounds for the local mode of interaction. Potassium pectinate of esterification degree E 57%, corresponding to polypeptides by c

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Lodeiro, Pablo, Adrian Fuentes, Roberto Herrero, and Manuel E. Sastre de Vicente. "CrIII binding by surface polymers in natural biomass: the role of carboxylic groups." Environmental Chemistry 5, no. 5 (2008): 355. http://dx.doi.org/10.1071/en08035.

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Environmental context. Large quantities of chromium are discharged into the environment as a result of its widespread use in modern industries, and consequently, chromium could constitute a serious pollution problem. Adsorption onto natural biomass offers real potential as a way of removing chromium from the environment, because such adsorbents contain biopolymers with particular chemical stability and selectivity towards metals. In addition, natural biomass constitutes an eco-friendly and cost-effective alternative to the existing methods. Here, specific interactions between chromium and the

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Shi, Min-Min, Mang Wang, and Hong-Zheng Chen. "Preparation and photoconductivity of PVP-CoPc self-assembled film." Journal of Materials Research 13, no. 12 (1998): 3550–54. http://dx.doi.org/10.1557/jmr.1998.0483.

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Through the complexation of cobalt phthalocyanine (CoPc) and a film of poly[4-vinyl- pyridine] (PVP) polarized by an electric field, a new type of preferentially oriented self-assembled film (PVP-CoPc) was obtained. The characterization of the film by differential scanning calorimetry (DSC), angle-dependent x-ray photoelectron spectroscopy (XPS), and Fourier transform infrared reflection absorption spectroscopy (FTIR-RAS) revealed that the planes of pyridine rings oriented perpendicular to the film surface, while the planes of phthalocyanine rings were oriented parallel with, and coordinated o

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Huang, Xing Qi, Xiao Rong Li, Da Wei Zhang, Chang Jun Xue, and Ai Qin Zhang. "Application of Polycarboxylate Superplasticizer in the Concrete." Materials Science Forum 898 (June 2017): 2076–80. http://dx.doi.org/10.4028/www.scientific.net/msf.898.2076.

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Compared with the traditional water reducer, polycarboxylicwater-reducing agent exhibits the advantages of high water-reducing rate, cement paste fluidity and low slump loss, etc. The structure of polycarboxylates water reducing agent molecular is comb type. Water reducing agent can be used in the molecular design because it has high water reducing rate, low dosage, good slump stability, and have great potential in increase strength. In recent years, it has attracted many researchers' attention. Water reducing agent can block or destroy cement granular flocculation structure, through the surfa

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Santo, Kolattukudy P., and Alexander V. Neimark. "Effects of metal-polymer complexation on structure and transport properties of metal-substituted polyelectrolyte membranes." Journal of Colloid and Interface Science 602 (November 2021): 654–68. http://dx.doi.org/10.1016/j.jcis.2021.06.018.

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Abraham, Leggins, Tiju Thomas, and Moorthi Pichumani. "Correlation of micellar aggregation – complexation regimes to discern stability of micellar structure and nano-encapsulation." Journal of Colloid and Interface Science 547 (July 2019): 234–44. http://dx.doi.org/10.1016/j.jcis.2019.04.003.

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Burdonov, A. E., N. V. Vchislo, E. A. Verochkina, and I. B. Rozentsveig. "Synthesis of new dithiocarbamate and xanthate complexes and their application in enrichment processes." Proceedings of Universities. Applied Chemistry and Biotechnology 13, no. 2 (2023): 160–71. http://dx.doi.org/10.21285/2227-2925-2023-13-2-160-171.

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Ore flotation is the main and defining technological process in ore benefication and non-ferrous metals production. The flotation process requires the use of a variety of chemical reagents, including collectors, frothers, surface modifiers, and pH regulators. The development and selection of suitable reagents for the processed material play a vital role in efficient flotation. The flotation activity of collectors depends fundamentally on the composition and structure of the hydrophobic and hydrophilic fragments forming the flotation agent molecule, as well as on the nature of the ore that unde

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Pokrovsky, O. S., G. S. Pokrovski, and J. Schott. "Gallium(III) adsorption on carbonates and oxides: X-ray absorption fine structure spectroscopy study and surface complexation modeling." Journal of Colloid and Interface Science 279, no. 2 (2004): 314–25. http://dx.doi.org/10.1016/j.jcis.2004.06.095.

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Andrews, Mark A., Eric J. Voss, George L. Gould, Wim T. Klooster, and Thomas F. Koetzle. "Regioselective Complexation of Unprotected Carbohydrates by Platinum(II): Synthesis, Structure, Complexation Equilibria, and Hydrogen-Bonding in Carbonate-Derived Bis(phosphine)platinum(II) Diolate and Alditolate Complexes." Journal of the American Chemical Society 116, no. 13 (1994): 5730–40. http://dx.doi.org/10.1021/ja00092a025.

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Yi, Man, and Yucheng Chen. "Enhanced phosphate adsorption on Ca-Mg-loaded biochar derived from tobacco stems." Water Science and Technology 78, no. 11 (2018): 2427–36. http://dx.doi.org/10.2166/wst.2019.001.

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Abstract Tobacco stems were used as precursors to prepare biochars (YGs) and develop Ca-Mg-loaded biochars (CMYGs) to enhance phosphate adsorption from aqueous solutions. Some influencing factors, such as pH, adsorption time, temperature, and structure characterization, were investigated. Fourier transform infrared (FTIR) spectra and X-ray diffraction (XRD) patterns showed several new peaks, indicating that Mg(OH)2 and MgO have been present on the surface of the CMYGs. The adsorption could reach equilibrium in 100 min reaction. The equilibrium data were well described by the Langmuir and Freun

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Zhang, Song, Guanyu Liang, Yongjun Xian, and Shuming Wen. "Enhancing Sulfidization and Flotation of Smithsonite Using Eco-Friendly Triethanolamine: Insights from Experimental and Simulation Studies." Molecules 29, no. 14 (2024): 3433. http://dx.doi.org/10.3390/molecules29143433.

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Triethanolamine (TEA) is a promising eco-friendly alternative to inorganic ammonia for enhancing surface sulfidization and flotation recovery of smithsonite. Micro-flotation experiments revealed an enhancement in smithsonite recovery to 95.21% with TEA modification, comparable to the results obtained using ammonia. The mechanisms behind the ability of TEA to enhance the sulfidization process were investigated through surface analysis and molecular dynamics simulations. TEA modification increased the content of sulfidization products, the proportion of crucial S22− in adsorbed products, and the

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Pantaleone, Stefano, Cecilia Irene Gho, Riccardo Ferrero, Valentina Brunella та Marta Corno. "Exploration of the Conformational Scenario for α-, β-, and γ-Cyclodextrins in Dry and Wet Conditions, from Monomers to Crystal Structures: A Quantum-Mechanical Study". International Journal of Molecular Sciences 24, № 23 (2023): 16826. http://dx.doi.org/10.3390/ijms242316826.

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Cyclodextrins (CDs) constitute a class of cyclic oligosaccharides that are well recognized and largely applied in the drug delivery field, thanks to their biocompatibility, low cost, and the possibility to be derivatized in order to tune and optimize the complexation/release of the specific drug. The conformational flexibility of these systems is one of their key properties and requires a cost-effective methodology to be studied by combining the accuracy of results with the possibility of exploring a large set of conformations. In the present paper, we have explored the conformational potentia

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Ching-Lin, Ho, Kuo Shu-Lung, and Kao I-Chan. "Study on the Stabilization of Lead in Soil with Phosphate Rock." European Journal of Advances in Engineering and Technology 9, no. 12 (2022): 70–76. https://doi.org/10.5281/zenodo.10647114.

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<strong>ABSTRACT</strong> This study selected the most representative agricultural soil in Taiwan, prepared the Pb-contaminated soil via manual simulation, and added phosphate rock to the soil, whereby it could be used as a material for restoring Pb-contaminated soil. The objective is to explore the release of Pb in the simulated Pb-contaminated soil washed with various extractants and compare the results. Additionally, this study explores the release of Pb in test soil after appropriate amounts of phosphate rock were added to it. First, the pH of the test soil, Lp series soil, indicates that

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Mizuhata, Yoshiyuki, Takahiro Sasamori, Nobuhiro Takeda, and Norihiro Tokitoh. "A Stable Neutral Stannaaromatic Compound: Synthesis, Structure and Complexation of a Kinetically Stabilized 2-Stannanaphthalene." Journal of the American Chemical Society 128, no. 4 (2006): 1050–51. http://dx.doi.org/10.1021/ja057531d.

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