Articoli di riviste: "SILICONE MICROSPHERE"

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Yu, Jibo, Elfed Lewis, Gilberto Brambilla e Pengfei Wang. "Temperature Sensing Performance of Microsphere Resonators". Sensors 18, n. 8 (1 agosto 2018): 2515. http://dx.doi.org/10.3390/s18082515.

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In recent years, many temperature sensing devices based on microsphere resonators have emerged, attracting an increasing research interest. For the purpose of this review article, microsphere resonators are divided according to their constituting materials, namely silicone, silica, compound glass, and liquid droplet. Temperature monitoring relies mainly on the thermo-optic/thermal expansion of the microspheres and on the fluorescence of the doped ions. This article presents a comprehensive review of the current state of the art of microsphere based temperature sensing and gives an indication of future directions.

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d'Almeida, J. R. M. "Evaluation of the Compressive Yield Strength of Hollow Glass Microsphere – Epoxy Composites as a Function of the Microsphere/ Epoxy Interface Strength". Polymers and Polymer Composites 15, n. 6 (settembre 2007): 445–51. http://dx.doi.org/10.1177/096739110701500603.

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The compressive yield strength of glass microsphere – epoxy composites was evaluated as a function of the interface strength. The behaviour of composites with microspheres without any surface treatment was compared with that of composites fabricated with silane-treated and silicone oil-treated microspheres. Varying the hardener-to-epoxy ratio of the matrix also modified the interface. The results were compared with those derived from theoretical models, and it was shown that for hollow glass microsphere composites the effect of surface treatment can be quantitatively described using extant models. Changes in the reinforcing effect and stress concentration factor caused by the presence of the microspheres are discussed, and the experimental results explained.

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Okoshi, Masayuki. "Fabrication of Superhydrophobic Silicone Rubber with Periodic Micro/Nano-Suction Cup Structure by ArF Excimer Laser-Induced Photodissociation". Nanomaterials 9, n. 6 (7 giugno 2019): 870. http://dx.doi.org/10.3390/nano9060870.

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A 193-nm ArF excimer laser was used to induce the photodissociation of Si–O bonds of silicone rubber in order to fabricate a periodic micro/nano-suction cup silicone structure, approximately 1 μm in diameter and 2 μm in height at regular intervals of 2.5 μm. The laser was focused on Al-coated silicone rubber by each silica glass microsphere 2.5 μm in diameter, which covered the entire surface of the silicone rubber. The silicone rubber underneath each microsphere photochemically swelled after laser-ablating the coated Al to limit the diameter of the swelling. Simultaneously, the coated Al was able to adjust the focal point to the surface of the silicone rubber to form a hole approximately 500 nm in diameter, centered at the swollen silicone. The dependences of the thickness of the coated-Al and the laser pulse number are discussed, based on the observations of a scanning electron microscope (SEM) and an atomic force microscope (AFM). The superhydrophobic property of the fabricated micro/nano-suction cup structure was successfully found.

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Yoon, Seok Ho, Hyoung Jin Choi e Hyoung Joon Jin. "Carbon Nanotubes-Adsorbed Polymeric Microspheres for Electrorheological Fluids". Key Engineering Materials 321-323 (ottobre 2006): 917–20. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.917.

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Surface-conductive microspheres consisting of poly(methyl methacrylate) (PMMA) (6.5 μm) core and carbon nanotubes (CNTs)-adsorbed shell were prepared using a simple process involving the blending of two colloidal solution; an aqueous CNT dispersion with surfactants and an aqueous PMMA microsphere colloid. These were adopted as the suspended particles for electrorheological (ER) fluids, in which the electrical conductivity originated primarily from the surface-coated conducting CNT layers. The CNT-adsorbed polymeric microspheres were monodisperse and spherical in shape. The CNT-PMMA composite suspensions in silicone oil showed the typical ER characteristics of forming a chain-like structure under an applied electric field. The CNT-PMMA composite microspheres exhibited a conductivity ranging from 5.2×10-4 to 6.3×10-5 S/cm, which is an acceptable conductivity range for ER fluids. This phenomenon can be explained by the interfacial polarizability of CNTs adsorbed on the surface of the polymeric microspheres.

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Yoon, Seok Ho, Min Sung Kang, Hun Sik Kim e Hyoung Joon Jin. "Electrically Conducting Silk Fibroin Microspheres by Incorporation of Multiwalled Carbon Nanotubes on their Surfaces". Materials Science Forum 544-545 (maggio 2007): 977–80. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.977.

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Electrorheological (ER) particles were obtained by the adsorption of multiwalled carbon nanotubes (MWCNT) on the surface of silk fibroin microspheres. The resulting spherical polymeric microspheres consist of a silk fibroin core and an MWCNT shell, which is electrically conducting. The silk fibroin microspheres were prepared by the phase separation of the silk fibroin and poly(ethylene oxide) (PEO) blend solution, and the MWCNT dispersion was prepared by ultrasonication with cetyltrimethylammonium bromide (CTAB) surfactant. The ER particles were prepared using a simple process involving the blending of the silk fibroin microsphere suspension and aqueous MWCNT dispersion. The morphology of the ER particles was examined by field emission scanning electron microscopy (FESEM) and their electrical conductivity measured by the four-probe method was 4.8×10-4 S/cm. The prepared composite microspheres suspended in silicone oil showed typical ER characteristics, including the formation of a chain-like structure under an applied electric field (1.9 kV/mm). This phenomenon can be explained by the interfacial polarizability of the MWCNTs adsorbed on the surface of the polymeric microspheres.

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Gu, Wen Juan, Ying Li e Bang Gui He. "Research on the Strengthen of Silicone Rubber". Advanced Materials Research 663 (febbraio 2013): 377–80. http://dx.doi.org/10.4028/www.scientific.net/amr.663.377.

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A new kind of microsphere filler was synthesized with octyltrimethoxysilane (WD13) and tetraethoxysilane (TEOS) by sol-gel method. The morphology of the filler was measured by TEM. The so synthesized spheres were added into the silicone rubber. Both the strain-stress and the water contact angle of the silicone rubber were researched. The results showed that both the mechanical property and the hydrophobic performance of the composite were improved compared with the blank specimen. The possible strengthen mechanism of the filler was discussed. The neotype silica sphere researched in this paper could react with the silicone rubber chains which perfects the vulcanization of the silicone rubber. This kind of sphere filler exhibits many merits for usage as filler.

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Liu, Xin, Guohui Wang, Jiahua Pei, Zhi Wang e Zhanjun Wu. "Fabrication and mechanical properties of a novel epoxy-hollow glass microsphere composite". Journal of Composite Materials 52, n. 12 (21 settembre 2017): 1627–32. http://dx.doi.org/10.1177/0021998317730895.

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According to the demand of deep-sea buoyancy material with high compression strength and low density, a novel epoxy-hollow glass microsphere composite was manufactured and characterized. Firstly, the epoxy resin is modified by chemical modification methods using poly(methyltriethoxysilane) to improve the toughness of epoxy resin. Then, the ammonium bicarbonate is used as the foaming agent to add into the epoxy resin to produce the bubbles. After mixing with a small amount of hollow glass microsphere, the modified epoxy-hollow glass microsphere composite with foams is fabricated. IR spectrum indicates that the silicone has been successfully grafted on the epoxy resin chain, which benefits the toughness of the resin. It can be found that a lot of smaller bubbles exist on the surface of hollow glass microsphere by SEM, which further reduces the density of the modified epoxy-hollow glass microsphere composite. The compression strength has been significantly improved since the bubbles on the surface of glass beads play the role of a buffer balloon and there are few air bubbles in the resin matrix. The coefficient of water absorption for the modified epoxy-hollow glass microsphere composite also increased. The flexural strength of the modified epoxy-hollow glass microsphere composite was slightly reduced at the same time. The results here confirm a promising method for buoyancy materials to promote the compression strength and reduce the density.

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Ronecker, Julia C., e Benjamin A. Evans. "Ligand-Targeted Binding of a Novel Silicone Magnetic Microsphere". Biophysical Journal 104, n. 2 (gennaio 2013): 522a—523a. http://dx.doi.org/10.1016/j.bpj.2012.11.2891.

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Ronecker, Julie C., e Benjamin A. Evans. "A Novel Silicone Magnetic Microsphere for Ligand-Targeted Drug Delivery". Biophysical Journal 102, n. 3 (gennaio 2012): 584a. http://dx.doi.org/10.1016/j.bpj.2011.11.3182.

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Mo, Yanqiang, Peihong Xue, Qiang Yang, Hao Liu, Xu Zhao, Jiaqi Wang, Meihua Jin e Yuhong Qi. "Composite Slow-Release Fouling Release Coating Inspired by Synergistic Anti-Fouling Effect of Scaly Fish". Polymers 13, n. 16 (5 agosto 2021): 2602. http://dx.doi.org/10.3390/polym13162602.

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Inspired by the antifouling properties of scaly fish, the conventional silicone coating with phenylmethylsilicone oil (PSO/PDMS) composite coating was fabricated and modified with single layer polystyrene (PS) microsphere (PSO/PDMS-PS) arrays. The fish scale like micro-nano structures were fabricated on the surface of bio-inspired coating, which can reduce the contact area with the secreted protein membrane of fouling organisms effectively and prevent further adhesion between fouling organisms and bio-inspired coating. Meanwhile, PSO exuded to the coating surface has the similar function with mucus secreted by fish epidermis, which make the coating surface slithery and will be polished with the fouling organisms in turbulent waters. Compared to PSO/PDMS coating without any structure and conventional silicone coating, PSO/PDMS-PS showed better antiadhesion activity against both marine bacteria and benthic diatom (Navicula sp.). Additionally, the existence of PS microspheres can reduce the release rate of PSO greatly, which will extend the service life of coating. Compared to PSO/PDMS coating, the sustained release efficiency of PSO/PDMS-PS coating can reach 23.2%. This facile method for fabricating the bio-inspired composite slow-release antifouling coating shows a widely fabricating path for the development of synergistic anti-fouling coating.

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Jang, Inseok, Wan-Ho Kim, Sie-Wook Jeon, Hyeon Kim e Jae-Pil Kim. "Enhancement of light-emitting diode reliability using silicone microsphere in encapsulant". Microelectronics Reliability 67 (dicembre 2016): 94–98. http://dx.doi.org/10.1016/j.microrel.2016.10.009.

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CHOI, HYOUNG J., YUN H. CHO, MIN S. CHO e MYUNG S. JHON. "ELECTRORHEOLOGY OF POLYANILINE-COATED POLY(METHYLMETHACRYLATE) MICROSPHERE SUSPENSIONS IN SILICONE OIL". International Journal of Modern Physics B 16, n. 17n18 (20 luglio 2002): 2507–13. http://dx.doi.org/10.1142/s021797920201258x.

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Electrorheological (ER) suspensions containing spherical-monodispersed polymer particles in silicone oil were investigated. The core was poly(methylmethacrylate) (PMMA), obtained by dispersion polymerization method, and the shell, coated on monodisperse PMMA particles, was polyaniline(PA) prepared by in-situ polymerization of aniline in aqueous acidic medium. Both steady shear and dynamic tests were conducted under various electric field strength and particle concentrations in order to study flow and viscoelastic properties of the PAPMMA based ER fluids. Dielectric spectra of the ER fluids obtained were found to given a clue both to analyze their electrical polarization properties and to interpret flow behavior of the PAPMMA ER fluids.

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Han, Tian-Long, Bi-Fan Guo, Guo-Dong Zhang e Long-Cheng Tang. "Facile Synthesis of Hollow Glass Microsphere Filled PDMS Foam Composites with Exceptional Lightweight, Mechanical Flexibility, and Thermal Insulating Property". Molecules 28, n. 6 (13 marzo 2023): 2614. http://dx.doi.org/10.3390/molecules28062614.

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The feature of low-density and thermal insulation properties of polydimethylsiloxane (PDMS) foam is one of the important challenges of the silicone industry seeking to make these products more competitive compared to traditional polymer foams. Herein, we report a green, simple, and low-cost strategy for synthesizing ultra-low-density porous silicone composite materials via Si-H cross-linking and foaming chemistry, and the sialylation-modified hollow glass microspheres (m-HM) were used to promote the HM/PDMS compatibility. Typically, the presence of 7.5 wt% m-HM decreases the density of pure foam from 135 mg/cm−3 to 104 mg/cm−3 without affecting the foaming reaction between Si-H and Si-OH and produces a stable porous structure. The optimized m-HM-modified PDMS foam composites showed excellent mechanical flexibility (unchanged maximum stress values at a strain of 70% after 100 compressive cycles) and good thermal insulation (from 150.0 °C to 52.1 °C for the sample with ~20 mm thickness). Our results suggest that the use of hollow microparticles is an effective strategy for fabricating lightweight, mechanically flexible, and thermal insulation PDMS foam composite materials for many potential applications.

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Hocking, Edwards JE, e PI Hynd. "Cutaneous circulation is correlated with Merino wool production". Australian Journal of Agricultural Research 45, n. 4 (1994): 757. http://dx.doi.org/10.1071/ar9940757.

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Laser Doppler velocimetry was used to investigate the cutaneous circulation and its relationship to wool growth in Finewool and Strongwool Merinos. Skin blood flow measured with the laser Doppler velocimeter (LDV) was highly correlated with estimates of blood flow obtained using 57Co-labelled microspheres (R2 = 0.85; P < 0.01), although the absolute values estimated by the microsphere technique were significantly higher (P < 0.001). Strongwool Merinos had a greater rate of blood flowing through the skin than Finewool Merinos, and this was associated with both wool production per unit area of skin (R2 = 0.27, P < 0.01) and with the total volume of germinative tissue in the skin (R2 = 0.54; P < 0.04). The relationship between the microvascular anatomy of the skin and blood flow was also examined in four Finewool Merinos and four Strongwool Merinos. Silicone rubber was infused into the deep circumflex iliac artery within the abdominal flank, from which an index of the area of vascular tissue per unit volume of skin was estimated. This index was not related to blood flow, wool growth or follicle density within nor between strains of Merinos. Both the usefulness and limitations of the LDV are discussed, and it was concluded that (a) blood flow has an important role in the level of wool produced both within and between strains of Merinos, and (b) laser Doppler velocimetry is a useful tool for the study of blood flow in the skin of sheep.

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Liu, Xi, Song Hu, Yan Tang, Zhongye Xie, Junbo Liu e Yu He. "Selecting a Proper Microsphere to Combine Optical Trapping with Microsphere-Assisted Microscopy". Applied Sciences 10, n. 9 (30 aprile 2020): 3127. http://dx.doi.org/10.3390/app10093127.

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Microsphere-assisted microscopy serves as an effective super-resolution technique in biological observations and nanostructure detections, and optical trapping is widely used for the manipulation of small particles like microspheres. In this study, we focus on the selection of microsphere types for the combination of the optical trapping and the super-resolution microsphere-assisted microscopy, by considering the optical trapping performances and the super-resolution imaging ability of index-different microspheres in water simultaneously. Finally, the polystyrene (PS) sphere and the melamine formaldehyde (MF) sphere have been selected from four typical index-different microspheres normally used in microsphere-assisted microscopy. In experiments, the optically trapped PS/MF microsphere in water has been used to achieve super-resolution imaging of a 139 nm line-width silicon nanostructure grating under white light illumination. The image quality and the magnification factor are affected by the refractive index contrast between the microspheres and the immersion medium, and the difference of image quality is partly explained by the photonic nanojet. This work guides us in selecting proper microspheres, and also provides a label-free super-resolution imaging technique in many research fields.

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Liu, Yunpeng, Le Li, Hechen Liu, Mingjia Zhang, Aijing Liu, Lei Liu, Li Tang, Guoli Wang e Songsong Zhou. "Hollow polymeric microsphere-filled silicone-modified epoxy as an internally insulated material for composite cross-arm applications". Composites Science and Technology 200 (novembre 2020): 108418. http://dx.doi.org/10.1016/j.compscitech.2020.108418.

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Liu, Lian Yun, Ting Ting Zhang, Hui Zhang, Xia Xia Bai e Stefano Polizzi. "Synthesis of Silicon Microspheres". Materials Science Forum 848 (marzo 2016): 505–18. http://dx.doi.org/10.4028/www.scientific.net/msf.848.505.

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The synthesis of silicon microspheres is of outmost importance, especially for the production of optical and electrical devices due to their unique properties displayed by this material. In this paper, we review the research on the synthesis of silicon microspheres, including one physical method, the drop method and several chemical methods, such as vapor-phase reaction, vapor-solid reaction, liquid phase reaction and magnesio-thermal reduction method. The formation mechanisms for silicon microsphere particles are also summarized.

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Romanov, Aleksey, Elena Romanova e Evgeny Chernyshov. "Elaboration of technology for manufacturing aluminum-based metal-matrix composite material strengthened with hollow ceramic microspheres for using thereof in underwater equipment". MATEC Web of Conferences 298 (2019): 00060. http://dx.doi.org/10.1051/matecconf/201929800060.

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This paper deals with the study of capabilities for strengthening an aluminum alloy with hollow ceramic microspheres. The results of the microstructural analysis and the investigation of strength properties for the aluminum-silicon alloying system are described herein. For comparison Experiments have been carried out for comparison both with classical microspheres and with chromium- and chromium-carbide-coated microspheres to increase the melt adhesion to a microsphere

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Liu, Hechen, Aijing Liu, Yunpeng Liu, Le Li, Zhuopeng Xie, Zhanpeng Guo e Xiaolin Li. "Electrical and Hydrolysis-resistance Properties of Silicone-Modified Resin/Microsphere Syntactic Foam for Composite Cross-arms Insulation Application". IEEE Transactions on Dielectrics and Electrical Insulation 28, n. 1 (febbraio 2021): 248–56. http://dx.doi.org/10.1109/tdei.2020.008819.

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Yuan, Yan, Shen Diao, Caide Zhao, Shuhua Ge, Xue Wang e Baorong Duan. "Preparation of Hollow Glass Microsphere/Organic Silicone Resin Composite Material with Low Dielectric Constant by In-Situ Polymerization". Silicon 12, n. 6 (6 agosto 2019): 1417–23. http://dx.doi.org/10.1007/s12633-019-00234-1.

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Медведев, А. В., А. А. Дукин, Н. А. Феоктистов e В. Г. Голубев. "Сферический распределенный брэгговский отражатель cо всенаправленной стоп-зоной в ближней ИК-области спектра". Физика и техника полупроводников 53, n. 7 (2019): 917. http://dx.doi.org/10.21883/ftp.2019.07.47867.9077.

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Spherical distributed Bragg reflectors (SDBR) for near-infrared applications are elaborated via plasma-enhanced chemical-vapor deposition. They consist of the alternating quarter-wave layers of amorphous hydrogenized silicon (a-Si:H) and amorphous silicon oxide (a-SiO2) deposited onto a glass microsphere or quartz microsphere, doped by erbium ions with a diameter of 500 microns. The reflection and transmission spectra of the SDBR are measured at different points of its surface. A wide band with a high reflectance and a low transmittance – a stop-band is detected. It is demonstrated that for different radial directions from the center of the microspheres the stop-bands overlap, forming an omnidirectional stop-band. The influence of the omnidirectional stop-band on spontaneous emission of erbium ions (1.53 micron) from the quartz microsphere is studied. It is shown that the omnidirectional stop-band suppresses the intensity of spontaneous emission by more than an order of magnitude.

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Ganachari, Sharanabasava V., Veerabhadragouda B. Patil, Nagaraj R. Banapurmath, Manzoore Elahi M. Soudagar, Kiran Shahapurkar, Ashraf Elfasakhany, Mishal Alsehli et al. "The Investigation of Mixed Ferrofluids Containing Iron Oxide nanoparticles and Microspheres". Advances in Materials Science and Engineering 2021 (9 dicembre 2021): 1–11. http://dx.doi.org/10.1155/2021/7616666.

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The aim of the present work is the synthesis and characterization of iron oxide (Fe3O4) nanoparticles. These nanoparticles are coated with oleic acid and polyvinyl butyral and mixed with microspheres and further developed ferrofluids with silicon oil. Studies of the performance of the nanoparticles in these ferrofluids with and without coating agents were carried out. The nanoparticles were synthesized using the chemical co-precipitation technique and coated with oleic acid and polyvinyl butyral, and it further mixed with microsphere ferrofluids and developed using silicon oil. The prepared Fe3O4 nanoparticles and their coated forms of oleic acid and polyvinyl butyral were mixed with microspheres; furthermore, ferrofluids were developed with silicon oil. All forms of these ferrofluids are characterized for morphology and phase purity (SEM, XRD, and FTIR). The iron oxide (Fe3O4) nanoparticles have shown different magnetic properties, differentiating macroscopic iron oxide in suspended particles. The ratio of surface to volume increases along with the decrease in atomic size, essential for assessing the surface morphological properties. The magneto-rheological (MR) fluids were determined, and shear stress of Expancel microsphere mixed iron oxide nanoparticle with and without them was found almost equal. However, the ferrofluid with PVB coated nanoparticles and microspheres emerged as a stable rheological ferrofluid, sustaining high shear stress and low viscosity with increasing shear rate. Also, shear rates up to 650 s−1 have been observed, showing very high shear stress withstanding capacity. The stability and performance of the magnetic colloidal ferrofluids depend on the thermal contribution and the balance between attractive/repulsive interactions.

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Wan, Yong, Zhong Yu Cai, Ming Hui Jia, Chao Li e Wan Qin Yang. "Fabrication of Colloidal Crystals on Different Patterned Silicon Substrates by Self-Assembly Method". Advanced Materials Research 850-851 (dicembre 2013): 92–95. http://dx.doi.org/10.4028/www.scientific.net/amr.850-851.92.

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Silica and polystyrene (PS) microspheres assembled on two quite different patterned silicon substrates, cross-like pillar pattern and eye-like pattern, respectively. The results indicated that the surface pattern imposes a predetermined lattice orientation in colloidal crystals (CCs). Other influent factors, such as microsphere size, the altitude of pattern and the concentration of colloidal suspension, may also play an important role on the self-assembly process.

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Hou, Jiaoyi, Yuntai Shi, Zihao Li, Jiaqi Wu, Yongjun Gong, Weifeng Zou, Han Zuo e Dayong Ning. "Numerical simulation and experimental study on flexible buoyancy material of hollow glass microsphere and silicone rubber for small deep-sea soft robots". Applied Materials Today 21 (dicembre 2020): 100875. http://dx.doi.org/10.1016/j.apmt.2020.100875.

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Lv, Chao, Shu Ming Wen, Shao Jun Bai e Yi Jie Wang. "Preparation of Novel Magnetic Fluorescent Microspheres Obtained by Chemical Method". Advanced Materials Research 726-731 (agosto 2013): 1591–95. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1591.

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The aim of this study is to analyze the properties of microspheres, which was obtained from an iron tailings. The flow-sheet of chemical method consists of chemical co-precipitation of Fe3O4 magnetic microspheres, SiO2 packaged and amino silicon alkylation modification with anthrone under NaBH4 existence. The results show that microspheres can be obtained successfully and it not only has a strong magnetism, but also has a fluorescence effort with the irradiating processing by ultraviolet with a wavelength of 282nm. This microsphere particle is a kind of high-value, environmentally-friendly products, it can be traced and served as a magnetic guide due to its magnetism and fluorescence properties, which has a big potential in medical technology and biological science.

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Lv, Shasha, Tao Huang e Hao Yu. "Silicon rubber/expandable microsphere based triboelectric nanogenerator for harvesting biomechanical energy". Journal of Physics: Conference Series 2076, n. 1 (1 novembre 2021): 012098. http://dx.doi.org/10.1088/1742-6596/2076/1/012098.

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Abstract Triboelectric nanogenerator (TENG) is favorable for harvesting adaptable and complex biomechanical energy in our daily life. Here, silicon rubber/expandable microsphere TENG was achieved by spin-coating a mixture of expandable microspheres and silicon rubber on a flat plate with conductive fabric. Furthermore, self-made flexible TPU/MWCNTs electrodes replaced commercial conductive fabric to make TENG more adapt to skin of human body. Finally, the optimized TENG in this work demonstrates energy harvesting capabilities and can be applied in self-powered sensor systems and provides new dimensions for biomechanical energy harvesters and wearable self-powered electronics.

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Yang, Rui Xia, Chen Xin, Peng Gao e Fan Yang. "Fabrication of Microfluidic Chip and Test of a Hydro-Focusing Based on Sheath Flow". Advanced Materials Research 468-471 (febbraio 2012): 1697–701. http://dx.doi.org/10.4028/www.scientific.net/amr.468-471.1697.

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Silicon etching is an essential process step for the fabrication of micro-electro-mechanical systems (MEMS). However, the rough edge of the silicon etching technology has some resistance to microspheres. This study presents fabrication process of the SU-8 photoresists mold which provides sharp edges and smooth sidewalls of the channel and details the RIE bonding of PDMS and glass substrate to realize the fabrication of microfluidic chips. This paper also investigates the hydrodynamic focusing and microsphere single-pass based on sheath flow with the aid of the plunger piston, which is important to the further combination of the microfluidic chip and the flow cytometry.

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Li, Xingcan, Li Lin, Hongyang Wang, Zeguo Shang, Jinyuan Lv e Yi Hao. "New Method for Measuring the Scattering Phase Function of Micron/Nano Particles". Photonics 10, n. 5 (28 aprile 2023): 511. http://dx.doi.org/10.3390/photonics10050511.

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The scattering phase function is crucial to analyze the light transport in the micron/nano particle suspensions. A new method including a liquid–particle system and reference system is proposed to measure the scattering phase function of the liquid–particle suspensions. In this method, a reference system of a standard particle is used to obtain the correction factor to compensate for the influence of the cuvette. Experimental validation was conducted for monodisperse silicon dioxide microspheres and monodisperse polystyrene microspheres. By considering the influence of the cuvette, both theoretical and experimental analyses prove that the proposed method can achieve a good result in the measurement of the scattering phase function of liquid–particle suspensions for particles with unknown size parameters and optical constants, especially when the size parameter of the particle is larger than 10. The correction factors of scattering light distribution of silicon dioxide microsphere suspensions with various mean particle sizes were obtained and analyzed. This method provides an alternative and simple way of measuring the scattering phase function of micron/nano particle suspensions.

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Gurbatov, Stanislav, Vladislav Puzikov, Evgeny Modin, Alexander Shevlyagin, Andrey Gerasimenko, Eugeny Mitsai, Sergei A. Kulinich e Aleksandr Kuchmizhak. "Ag-Decorated Si Microspheres Produced by Laser Ablation in Liquid: All-in-One Temperature-Feedback SERS-Based Platform for Nanosensing". Materials 15, n. 22 (15 novembre 2022): 8091. http://dx.doi.org/10.3390/ma15228091.

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Combination of dissimilar materials such as noble metals and common semiconductors within unified nanomaterials holds promise for optoelectronics, catalysis and optical sensing. Meanwhile, difficulty of obtaining such hybrid nanomaterials using common lithography-based techniques stimulates an active search for advanced, inexpensive, and straightforward fabrication methods. Here, we report one-pot one-step synthesis of Ag-decorated Si microspheres via nanosecond laser ablation of monocrystalline silicon in isopropanol containing AgNO3. Laser ablation of bulk silicon creates the suspension of the Si microspheres that host further preferential growth of Ag nanoclusters on their surface upon thermal-induced decomposition of AgNO3 species by subsequently incident laser pulses. The amount of the AgNO3 in the working solution controls the density, morphology, and arrangement of the Ag nanoclusters allowing them to achieve strong and uniform decoration of the Si microsphere surface. Such unique morphology makes Ag-decorated Si microspheres promising for molecular identification based on the surface-enhanced Raman scattering (SERS) effect. In particular, the designed single-particles sensing platform was shown to offer temperature-feedback modality as well as SERS signal enhancement up to 106, allowing reliable detection of the adsorbed molecules and tracing their plasmon-driven catalytic transformations. Considering the ability to control the decoration degree of Si microspheres by Ag nanoclusters via amount of the AgNO3, the developed one-pot easy-to-implement PLAL synthesis holds promise for gram-scale production of high-quality hybrid nanomaterial for various nanophotonics and sensing applications.

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Wu, Chengtie, Wei Fan, Michael Gelinsky, Yin Xiao, Jiang Chang, Thor Friis e Gianaurelio Cuniberti. "In situ preparation and protein delivery of silicate–alginate composite microspheres with core-shell structure". Journal of The Royal Society Interface 8, n. 65 (25 maggio 2011): 1804–14. http://dx.doi.org/10.1098/rsif.2011.0201.

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The efficient loading and sustained release of proteins from bioactive microspheres remain a significant challenge. In this study, we have developed bioactive microspheres which can be loaded with protein and then have a controlled rate of protein release into a surrounding medium. This was achieved by preparing a bioactive microsphere system with core-shell structure, combining a calcium silicate (CS) shell with an alginate (A) core by a one-step in situ method. The result was to improve the microspheres' protein adsorption and release, which yielded a highly bioactive material with potential uses in bone repair applications. The composition and the core-shell structure, as well as the formation mechanism of the obtained CS–A microspheres, were investigated by X-ray diffraction, optical microscopy, scanning electron microscopy, energy dispersive spectrometer dot and line-scanning analysis. The protein loading efficiency reached 75 per cent in CS–A microspheres with a core-shell structure by the in situ method. This is significantly higher than that of pure A or CS–A microspheres prepared by non- in situ method, which lack a core-shell structure. CS–A microspheres with a core-shell structure showed a significant decrease in the burst release of proteins, maintaining sustained release profile in phosphate-buffered saline (PBS) at both pH 7.4 and 4.3, compared with the controls. The protein release from CS–A microspheres is predominantly controlled by a Fickian diffusion mechanism. The CS–A microspheres with a core-shell structure were shown to have improved apatite-mineralization in simulated body fluids compared with the controls, most probably owing to the existence of bioactive CS shell on the surface of the microspheres. Our results indicate that the core-shell structure of CS–A microspheres play an important role in enhancing protein delivery and mineralization, which makes these composite materials promising candidates for application in bone tissue regeneration.

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Jo, A. Hae, So Yeun Kim, Ji Hoon Kim, Yoong Ahm Kim e Cheol-Min Yang. "Robust Core–Shell Carbon-Coated Silicon-Based Composite Anode with Electrically Interconnected Spherical Framework for Lithium-Ion Battery". International Journal of Energy Research 2023 (3 febbraio 2023): 1–13. http://dx.doi.org/10.1155/2023/6874429.

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Carbon-coated Si/carbon nanotube/graphene oxide (C-Si/CNT/GO) microspheres with a robust core–shell composite structure were successfully fabricated by efficient and scalable spray-drying and chemical vapor deposition (CVD) for application as a lithium-ion battery (LIB) anode. The amphiphilic GO nanoparticles facilitated the uniform dispersion of Si nanoparticles by suppressing the CNT aggregation in the Si/CNT/GO microspheres, efficiently forming a robust Si/CNT/GO microsphere composite structure. The surface of the Si/CNT/GO microsphere composite was coated with carbon using CH4 via CVD to enhance its cycling performance. The four building block components, namely, Si nanoparticles, CNTs, and GO nanoparticles as the core and the carbon-coating layers as the shell, provided high electrochemical capacity, excellent electrical conductivity, efficient buffer space for the volume expansion of the Si nanoparticles, and high structural stability during lithiation/delithiation. The C-Si/CNT/GO composite anode also exhibited excellent electrochemical performance with high specific capacity (2921 mAh g–1 at 100 mA g–1), long cycle life (1542 mAh g–1 at 200 mA g–1 after 100 cycles), and high charge/discharge rate (1506 mAh g–1 at 6 A g–1). This approach for fabricating core–shell structured Si-based composite anodes with excellent electrochemical performance will provide a significant breakthrough for developing next-generation LIBs.

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Chojnowski, J., S. Slomkowski, W. Fortuniak, U. Mizerska e P. Pospiech. "Hydrophilic Polysiloxane Microspheres and Ceramic SiOC Microspheres Derived from Them". Journal of Inorganic and Organometallic Polymers and Materials 30, n. 1 (25 ottobre 2019): 56–68. http://dx.doi.org/10.1007/s10904-019-01281-2.

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Abstract In this overview article, the research on polysiloxane microspheres performed in the authors’ laboratory is briefly reviewed. These microspheres are prepared in water emulsion from polyhydromethylsiloxane (PHMS). This polymer is cross-linked in the emulsion process by hydrosilylation using various low molecular weight cross-linkers having at least two vinyl functions. The microspheres contain a large number of silanol groups which give them hydrophilicity and a broad possibility of functionalization by condensation with reactive silanes bearing a functional group in the organic radical. Further transformation of these functions leads to materials for practical use, such as catalysts and biocidal powders. The hydrophilic-hydrophobic properties of the microspheres may be fine-tuned by silylation or modification of the precursor PHMS polymer. Pristine microspheres are highly hydrophilic and well-dispersed in water. They do not adsorb proteins and hydrophobic organic substances. Macropores may be generated in these particles by a simple modification of the emulsion procedure. These microspheres are also very good precursors for ceramic silicon oxycarbide microsphers because they retain their shape in pyrolytic processes even at high temperatures; and they give a high yield of ceramic material. The polysiloxane microspheres heated at 600 °C give micro and mezo porous materials with specific surface above 500 m2/g. When pyrolysed at temperatures 1000–1400 °C, they form solid ceramic microspheres of high strength. They retain spherical shape at 1500 °C although cracks are formed at their surfaces. Etching them with HF(aq) solution gives porous microspheres with specific surface above 1000 m2/g that is almost devoid of SiO2.

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Tang, Hao, Yuanyuan Xu, Li Liu, Decheng Zhao, Zhen Zhang, Yutong Wu, Yi Zhang, Xiang Liu e Zhoulu Wang. "A Hollow Silicon Nanosphere/Carbon Nanotube Composite as an Anode Material for Lithium-Ion Batteries". Coatings 12, n. 10 (10 ottobre 2022): 1515. http://dx.doi.org/10.3390/coatings12101515.

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Abstract (sommario):

Silicon possesses a high theoretical specific capacity and is a promising high-performance anode material for lithium-ion batteries (LIBs). However, it shows a poor cycling performance because of volume expansion. A hollow structure can improve Si cycling performance, and the template method is one of the most common methods for hollow micro/nanosphere preparation. A polystyrene (PS) microsphere has the advantages of having a uniform and controllable particle size, easy modification, and high stability, thus being an ideal template for preparing hollow structure material. Herein, PS microspheres are used as templates to obtain hollow silica spheres, and then obtain hollow silicon spheres with an inner pore diameter of ~50 nm by a magnesium thermal reduction method. Lithium-ion battery anode material is obtained using carbon nanotubes supporting hollow silicon spheres (Si-CNTs). Si-CNTs exhibit excellent cycling performance (1188 mAh g−1 after 200 cycles) and excellent rate capability (484 mAh g−1 at 1 A g−1). Hollow porous Si-CNTs show great potential, providing a promising idea for solving the volume expansion problem of Si.

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Shao, Lei, Bingchu Pan, Ruxia Hou, Yuan Jin e Yudong Yao. "User-friendly microfluidic manufacturing of hydrogel microspheres with sharp needle". Biofabrication 14, n. 2 (7 marzo 2022): 025017. http://dx.doi.org/10.1088/1758-5090/ac57a5.

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Abstract (sommario):

Abstract Hydrogel microspheres are flexible microstructures with many fascinating functions, such as three-dimensional cell culture, injection therapy, drug delivery, organoids and microtissues construction. The traditional methods of manufacturing hydrogel microspheres more or less have some shortcomings, such as atomization/emulsion method with uneven sizes; piezoelectric-/thermal-/electric-assisted inkjet with high cell damage and unknown cell growth effects; microfluidic manufacturing with sophisticated microdevices etc, which lead to poor user experiences. Here, we designed a user-friendly microfluidic device to generate hydrogel microspheres with sharp needles that can be replaced at will. Specifically, a commercial tapered opening sharp needle was inserted into a transparent silicone tube with the tapered opening facing the upper wall of the silicone tube. Then, gelatin methacrylate (GelMA) solution and paraffin oil were pumped into the sharp needle and the silicone tube respectively. GelMA microdroplets were formed under the shear stress of the silicone tube and the oil phase, and after being photo-crosslinked in situ, GelMA microspheres with uniform and adjustable sizes can be generated. Due to the simplicity of our original device, heterogeneous microspheres such as Janus, core–shell and hollow microspheres can be easily manufactured by simple modification of the device. In addition, we demonstrated the strong flexibility and maneuverability of the microspheres through macroscopic free assembly. Finally, we prepared different cell-laden GelMA microspheres, and the cells showed stretching behavior similar to that in vivo after a short period culture, which indicated the high bioactivity of GelMA microspheres. Meanwhile, we cultured the Janus cell-laden GelMA microspheres and the assembly of cell-laden GelMA microspheres, where the cells stretched and interacted, demonstrating the potential of GelMA microspheres for co-culture and fabrication of large-scale tissue constructs. In view of the above results, our user-friendly microfluidic manufacturing method of hydrogel microspheres with sharp needles will provide great convenience to relevant researchers.

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Malyar, Nasser M., Mario Gössl, Patricia E. Beighley e Erik L. Ritman. "Relationship between arterial diameter and perfused tissue volume in myocardial microcirculation: a micro-CT-based analysis". American Journal of Physiology-Heart and Circulatory Physiology 286, n. 6 (giugno 2004): H2386—H2392. http://dx.doi.org/10.1152/ajpheart.00682.2003.

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The volume of myocardial tissue that is perfused by an epicardial coronary artery has been shown to be predictably related to the diameter of the epicardial arterial lumen. However, to what extent the intramyocardial microvasculature follows the epicardial rules remains unclear. To explore the relationship between the diameter of coronary arterioles and their subsequent perfused myocardial volumes, we quantified the volume of nonperfused myocardium resulting from an embolized arteriole of a certain diameter. We injected a single dose of microspheres selected from one of nine possible microsphere combinations (10, 30, and 100 μm diameter, each at three possible doses) into the left anterior descending coronary and/or left circumflex arteries of seven anesthetized pigs. At postmortem, the coronary arteries were infused with a radiopaque silicon polymer. Embolized myocardium (1 cm3) was scanned with a microcomputerized tomography scanner and resulted in three-dimensional images that consisted of 20 μm/side cubic voxels and a subvolume of the specimen with 4 μm/side cubic voxels. Image analysis provided the number and volumes of myocardial perfusion defects for each size and dose of microspheres. The smallest individual myocardial perfusion defects, which correspond to the volume of myocardium perfused by a single embolized arteriole, were found to be 0.0004 ± 0.0002, 0.02 ± 0.004, and 0.62 ± 0.099 mm3 for the 10-, 30-, and 100-μm microspheres, respectively. The number of myocardial perfusion defects in the embolized myocardium was inversely related to the dose of the injected microspheres. This reflects a clustering behavior that is consistent with a random distribution process of the individual embolized perfusion defects.

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ZHANG, ZAILEI, YANHONG WANG, MEIJU ZHANG, QIANGQIANG TAN e FABING SU. "SURFACE DECORATION OF COMMERCIAL GRAPHITE MICROSPHERES WITH SMALL Si/C MICROSPHERES AS IMPROVED ANODE MATERIALS FOR Li-ION BATTERIES". Journal of Molecular and Engineering Materials 01, n. 04 (dicembre 2013): 1340017. http://dx.doi.org/10.1142/s2251237313400170.

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We report a facile chemical vapor deposition (CVD) method to grow silicon/carbon ( Si / C ) microspheres on commercial graphite microsphere (GMs) surface to prepare Si / C / GMs composite anode materials for Li -ion batteries. The CVD synthesis is conducted at 900°C using methyltrichlorosilane ( CH 3 SiCl 3) as both the Si and C precursor, which is a cheap byproduct in organosilane industry. The samples are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis, Raman spectroscopy and X-ray photoelectron spectroscopy. It is found that the obtained Si / C / GMs composites are composed of Si nanocrystals, amorphous carbon and GMs. The CVD time significantly influences the morphology and electrochemical performance of the Si / C / GMs composite materials. The Si / C / GMs composite materials prepared at CVD condition of 900°C for 4 h possess improved electrochemical properties, showing a discharge capacity of 821.4 mAh g−1 at a rate of 50 mA g−1, and a good cycling performance (i.e., a reversible capacity of 565.2 mAh g−1 is retained after 50 cycles). The enhanced electrochemical performance is attributed to the formation of Si / C microsphere network among GMs, which increases the electronic conductivity and is able to buffer the large volume changes of Si during lithium ion insertion/extraction.

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Sun, Ziqian, Zhiyang Zhao, Yong Kong, Jian Ren, Xing Jiang e Xiaodong Shen. "Auto-Continuous Synthesis of Robust and Hydrophobic Silica Aerogel Microspheres from Low-Cost Aqueous Sodium Silicate for Fast Dynamic Organics Removal". Gels 8, n. 12 (28 novembre 2022): 778. http://dx.doi.org/10.3390/gels8120778.

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Abstract (sommario):

An efficient auto-continuous globing process was developed with a self-built apparatus to synthesize pure silica aerogel microspheres (PSAMs) using sodium silicate as a precursor and water as a solvent. A hydrophobic silica aerogel microsphere (HSAM) was obtained by methyl grafting. A reinforced silica aerogel microsphere (RSAM) was prepared by polymer cross-linking on the framework of the silica gel. The pH value of the reaction system and the temperature of the coagulating bath were critical to form perfect SAMs with a diameter of 3.0 ± 0.2 mm. The grafted methyl groups are thermally stable up to 400 °C. Polymer cross-linking increased the strength significantly, owing to the polymer coating on the framework of silica aerogel. The pore volumes of HSAM (6.44 cm3/g) and RSAM (3.17 cm3/g) were much higher than their state-of-the-art counterparts. Their specific surface areas were also at a high level. The HSAM and RSAM showed high organic sorption capacities, i.e., 17.9 g/g of pump oil, 11.8 g/g of hexane, and 22.2 mg/g of 10 mg/L methyl orange. The novel preparation method was facile, cost-effective, safe, and eco-friendly, and the resulting SAM sorbents were exceptional in capacity, dynamics, regenerability, and stability.

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Wang, Yue Hui. "Large-Area Self-Assembled Monolayer of Silica Microspheres by Convective Assembly". Key Engineering Materials 609-610 (aprile 2014): 479–82. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.479.

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Abstract (sommario):

We reported here a convective assembly process for the formation of large-area self-assembled monolayers of silica microspheres on silicon and glass substrates. Uniformly coated monolayers of silica spheres were achieved on silicon wafers with and without coated SiN2 of 3 inch of diameter and large glass substrate of 6 × 6 in2 in size. The coating of large-area uniform monolayers of silica microspheres was characterized with scanning electron microscopy and optical microscopy. The mechanism of the convective assembly has been explained by the convective flux that is generated by capillary immersion force caused from the solution evaporation and hydrodynamic drag force. The patterns of silica microspheres were transferred to the silicon substrates using a deep reactive ion etching technique. It is found that textured silicon reduced the reflectance of silicon substrate from 52.2% to 33.2% around 400 nm and from 33.9% to 19.5% around 1,100 nm. The rapid self-assembled monolayer with silica microspheres provided a glimpse at the wide range of coating and photonic device applications where convective assembly can be used.

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Gao, Yong, Jing Tao Ma, Xing Yu Zhao, Shao Chang Hao e Chang Sheng Deng. "The Formation of Alumina Ceramic Microspheres by Internal Gelation Process". Key Engineering Materials 655 (luglio 2015): 103–7. http://dx.doi.org/10.4028/www.scientific.net/kem.655.103.

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Abstract (sommario):

Alumina ceramic microspheres were prepared via internal gelation process. By dropping sol from a cold broth into hot silicone oil gelled microspheres would solidify within a few seconds by decomposition of hexamethylenetetramine (HMTA). The effect of the broth component on the performance of the broth and gelled microspheres obtained has been investigated. The Al2O3 ceramic microspheres can be obtained after aging, washing, drying and sintering. The Al2O3 microspheres prepared with optimized formulation have uniform size and good sphericity, with an average diameter of 690μm and crush strength of greater than 12N/sphere.

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Guo, Shi Ling, Zi Yang Yu, Yi Liang Chen e Xin Xing Chen. "In Situ Synthesis of Zeolite NaKL In Highly-Enriched Spinel Matrix". Advanced Materials Research 236-238 (maggio 2011): 1045–48. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1045.

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Abstract (sommario):

Zeolite NaKL was in-situ crystallized under static condition with kaolin microspheres calcined at 980 °C as silicon and aluminium sources. Influences of hydrothermal synthesis conditions such as the mole ratio of n(K2O)/n(Na2O), n(OH-)/n(SiO2) and crystallizaion time on crystallization of zeolite L were studied in detail. The crystal phase and morphology of the as-prepared zeolite samples were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The results showed that the as-synthesized samples owned characteristic peaks of zeolite L with high crystallinity and were covered uniformly by regular crystal of zeolite L on its kaolin microsphere surface , which maintained complete ball shape as before. The optimum conditions to get zeolite NaKL with high crystallinity by this method were found to be the mole ratio of n(K2O)/n(Na2O) =7:3 and n(OH-)/n(SiO2) =0.50 in the reaction mixture, an aging of the reactants at room temperature for 30 h and crystallization temperature 120 °C for 24 h.

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Gómez-Martínez, Arancha, Francisco Márquez, Eduardo Elizalde e Carmen Morant. "Microspheres for the Growth of Silicon Nanowires via Vapor-Liquid-Solid Mechanism". Journal of Nanomaterials 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/362798.

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Abstract (sommario):

Silicon nanowires have been synthesized by a simple process using a suitable support containing silica and carbon microspheres. Nanowires were grown by thermal chemical vapor deposition via a vapor-liquid-solid mechanism with only the substrate as silicon source. The curved surface of the microsized spheres allows arranging the gold catalyst as nanoparticles with appropriate dimensions to catalyze the growth of nanowires. The resulting material is composed of the microspheres with the silicon nanowires attached on their surface.

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Hong, Juan, e Wei Zhang. "Theoretical and Experimental Research on Preparing Silicon Microspheres by Pulsed Electrical Discharge Method". Applied Mechanics and Materials 456 (ottobre 2013): 503–6. http://dx.doi.org/10.4028/www.scientific.net/amm.456.503.

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Abstract (sommario):

In this paper, a new method of preparing silicon microspheres is introduced. Silicon microspheres have been produced under transient and high temperature generated with pulsed electrical discharge in the liquid. Their micro topography and composition are characterized and analyzed by SEM/EDS. The mechanism of sphere formation is studied by local area temperature field analysis using ANSYS. Various sizes of silicon particles (0.5-30μm) are successfully prepared under the different processing conditions. It is demonstrated that pulsed electrical discharge method is energy controllable, cost-effective, and is of great significance to the preparation of silicon ink which is the important material of new type of TFSC and selective emitter cell.

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Cheng, Chuan’ao, Chongguang Zang e Yijun Chen. "The Thermal Insulation Composites for Lithium-ion Batteries". Journal of Physics: Conference Series 2468, n. 1 (1 aprile 2023): 012118. http://dx.doi.org/10.1088/1742-6596/2468/1/012118.

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Abstract In this paper, the high-efficiency thermal insulation composites were prepared and investigated, which are formed by the addition of hollow SiO2 microspheres, hollow glass microspheres, and hollow phenolic microspheres into addition-type liquid silicone rubber. The thermal conductivity of composites is as low as 0.054 W/(m·K), which is 70.65% lower than the matrix (the thermal conductivity of the matrix is 0.184 W/(m·K)), and the tensile strength is 1.003 Mpa, and the thermal decomposition temperature of the composites is 427 °C .

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Ren, Wenfeng, Zailei Zhang, Yanhong Wang, Qiangqiang Tan, Ziyi Zhong e Fabing Su. "Preparation of porous silicon/carbon microspheres as high performance anode materials for lithium ion batteries". Journal of Materials Chemistry A 3, n. 11 (2015): 5859–65. http://dx.doi.org/10.1039/c4ta07093c.

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Jivotkov, Oleg, Vladimir Kotlyar, Grigorii Kozlov, Irina Jivotkova e A. Kozlov. "Silicate Brick with Reduced Density and Thermal Conductivity". Materials Science Forum 1011 (settembre 2020): 37–43. http://dx.doi.org/10.4028/www.scientific.net/msf.1011.37.

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Abstract (sommario):

Modern housing practice involves the widespread use of silicate brick. The main disadvantage of this building material is its high average density, accompanied by high thermal conductivity, which is accompanied by large heat losses through the enclosing walls of buildings and structures. This article discusses the possibility of improving the thermal characteristics of silicate materials through the use of ash microspheres in the production of piece silicate products, which will significantly reduce the thermal conductivity of the manufactured material. Ash microspheres, being a component of ash and slag waste from the thermal power plants, have a number of valuable properties: firstly, very low density, secondly, closed micro porosity, thirdly, chemical and mineralogical composition prone to reactions under conditions of elevated temperatures and pressures. We have studied the chemical and mineralogical composition as well as physical and mechanical properties of ash microspheres, developed the compositions and technological parameters for the silicate materials production. It has been established that the replacement of quartz sand with ash microspheres as part of the molding mass makes it possible to obtain a silicate brick of medium density class 1.0 and strength sufficient to erect load-bearing enclosing products and structures. Compositions of molding materials using a silicate binder and aluminosilicate ash microspheres using the generally accepted methods were developed and the properties of the obtained silicate material and were studied in accordance with the current GOST requirements for the similar materials.

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Marl, Svenja, Ralf-Urs Giesen e Hans-Peter Heim. "Liquid Silicone Rubber Foamed with Thermoplastic Expandable Microspheres". Materials 15, n. 11 (25 maggio 2022): 3779. http://dx.doi.org/10.3390/ma15113779.

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Abstract (sommario):

To reduce the material costs as well as the density of Liquid Silicone Rubber (LSR), LSR foams can be produced in an injection molding process. Expandable thermoplastic microspheres can be used as blowing agents. This publication deals with the analysis of the cell structure of these LSR foams. For this purpose, cylindrical disks are injection molded and examined for their cell structure as a function of different proportions of microspheres using a scanning electron spectroscope. In addition, the density of the samples is determined. It was found that a very homogeneous cell structure is produced in this process, that heat transport has a significant influence on the expansion of the microspheres, and that the formation of a filler network limits the expansion at higher proportions of blowing agent.

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Ren, Yu Min, Bing Yu, Hai Lin Cong, Yu Rong Ma, Zhen Zhen Ma e Xue Yuan. "Preparation of Monodisperse PEG Microspheres by a T-Junction Microfluidic Chip". Advanced Materials Research 465 (febbraio 2012): 178–81. http://dx.doi.org/10.4028/www.scientific.net/amr.465.178.

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Abstract (sommario):

Monodisperse polyethylene glycol (PEG) microspheres were prepared using microfluidic chips coupled with photopolymerization technique. Based on sheath effect in T-junction microfluidic channels, dispersions of uniform PEG prepolymer droplets in silicon oil are formed. The diameters of the formed PEG prepolymer droplets in the dispersions were controlled very well by altering the relative sheath/sample flow rate ratios. After photopolymerization under UV exposure, the uniform PEG prepolymer droplets isolated by silicon oil underwent photocrosslinking and became monodisperse PEG microspheres.

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Peng, Dong Sheng, Zhi Gang Chen e Cong Cong Tan. "Research of Preparation and Etching of PS Microspheres Film". Advanced Materials Research 602-604 (dicembre 2012): 1470–73. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.1470.

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Abstract (sommario):

In this article, the polystyrene (PS) microspheres monolayer film was manufactured on silicon substrate by spin-coating, and the effect of PS microspheres concentration on preparation of monolayer film was discussed in detail. With a view to the application of graphic substrate technology, the etching effect with different technological parameter (etching time and power) was researched, and a set of appropriate process parameter were obtained, which met the requirements of preparation of the extension graphics silicon substrate.

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Xiong, Gang, Bin-Bin Wang, Li-Xin You, Bao-Yi Ren, Yong-Ke He, Fu Ding, Ileana Dragutan, Valerian Dragutan e Ya-Guang Sun. "Hypervalent silicon-based, anionic porous organic polymers with solid microsphere or hollow nanotube morphologies and exceptional capacity for selective adsorption of cationic dyes". Journal of Materials Chemistry A 7, n. 1 (2019): 393–404. http://dx.doi.org/10.1039/c8ta07109h.

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Ahmed, Nasar, Abdul Majid, M. A. Khan, M. Rashid, Z. A. Umar e M. A. Baig. "Synthesis and characterization of Zn/ZnO microspheres on indented sites of silicon substrate". Materials Science-Poland 36, n. 3 (1 settembre 2018): 501–8. http://dx.doi.org/10.2478/msp-2018-0058.

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Abstract (sommario):

AbstractSelf-assembled Zn/ZnO microspheres have been accomplished on selected sites of boron doped P-type silicon substrates using hydrothermal approach. The high density Zn/ZnO microspheres were grown on the Si substrates by chemical treatment in mixed solution of zinc sulfate ZnSO4·7H2O and ammonium hydroxide NH4(OH) after uniform heating at 95 °C for 15 min. The Zn/ZnO microspheres had dimensions in the range of 1 μm to 20 μm and were created only on selected sites of silicon substrate. The crystal structure, chemical composition and morphology of as-prepared samples were studied by using scanning electron microscope SEM, X-ray diffraction XRD, energy dispersive X-ray spectroscopy EDS, Fourier transform infrared spectroscopy FT-IR and UV-Vis diffuse reflectance absorption spectra DRS. The energy band gap Eg of about 3.28 eV was obtained using Tauc plot. In summary, this study suggests that interfacial chemistry is responsible for the crystal growth on indented sites of silicon substrate and the hydrothermal based growth mechanism is proposed as a useful methodology for the formation of highly crystalline three dimensional (3-D) Zn/ZnO microspheres.

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