Journal articles: 'Organosilice'

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Ide, Matthias, Els De Canck, Isabel Van Driessche, Frédéric Lynen, and Pascal Van Der Voort. "Developing a new and versatile ordered mesoporous organosilica as a pH and temperature stable chromatographic packing material." RSC Advances 5, no. 8 (2015): 5546–52. http://dx.doi.org/10.1039/c4ra15837g.

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Mohd, Hanafi Ani, Maziati Akmal Mohd Hatta, and Raihan Othman. "Effect of Al Ions on Adsorption Efficiency of Mesoporous Organosilica for Water Treatment." Advanced Materials Research 415-417 (December 2011): 2024–31. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.2024.

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Porous organosilica is a promising material to be applied in water treatment due to high adsorption capacity of contaminants. Sol-gel method was used to fabricate mesoporous organosilioca from triblock copolymers, poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) as the template and tetraethylorthosilicate as silicate source. The organosilica is doped with Al powder and Al2SO3 in order to evaluate the effect of ions on their adsorption capacity. It was demonstrated that the adsorption capacity is proportional to Al concentration, and inversely proportional to porosity. Metallic compound doped in organosilica enhances the remediation process and optimize the water treatment process. Moreover, impregnation the samples into cellulosic sponge improves the adsorption efficiency by 25%.

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Asefa, Tewodros, and Zhimin Tao. "Mesoporous silica and organosilica materials — Review of their synthesis and organic functionalization." Canadian Journal of Chemistry 90, no. 12 (December 2012): 1015–31. http://dx.doi.org/10.1139/v2012-094.

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Mesoporous silica and organosilica materials are a class of nanostructured materials that have porous structures with tunable nanometer pores, large surface areas, high pore volumes, and, in some cases, well-ordered mesostructures. Furthermore, in the case of mesoporous organosilicas, the materials possess various types of organic functional groups. This review highlights the different synthetic methods developed for mesoporous silica and organosilica nanomaterials. The review also discusses the various synthetic strategies used to functionalize the surfaces of mesoporous silica materials and produce highly functionalized mesoporous materials. Rational design and synthetic methods developed to place judiciously chosen one or more than one type of functional group(s) on the surfaces of mesoporous silica materials and generate monofunctional and multifunctional mesoporous silica materials are also introduced. These organic functionalization methods have made possible the synthesis of organically functionalized mesoporous silicas and mesoporous organosilicas with various interesting properties and many potential applications in different areas, ranging from catalysis to drug delivery and biosensing.

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Omar, Suheir, and Raed Abu-Reziq. "Highly Active Ruthenium Catalyst Supported on Magnetically Separable Mesoporous Organosilica Nanoparticles." Applied Sciences 10, no. 17 (August 20, 2020): 5769. http://dx.doi.org/10.3390/app10175769.

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A facile and direct method for synthesizing magnetic periodic mesoporous organosilica nanoparticles from pure organosilane precursors is described. Magnetic ethylene- and phenylene-bridged periodic mesoporous organosilica nanoparticles (PMO NPs) were prepared by nanoemulsification techniques. For fabricating magnetic ethylene- or phenylene-bridged PMO NPs, hydrophobic magnetic nanoparticles in an oil-in-water (o/w) emulsion were prepared, followed by a sol–gel condensation of the incorporated bridged organosilane precursor (1,2 bis(triethoxysilyl)ethane or 1,4 bis(triethoxysilyl)benzene), respectively. The resulting materials were characterized using high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray (EDX) spectroscopy, powder X-ray diffraction (XRD), solid-state NMR analysis, and nitrogen sorption analysis (N2-BET). The magnetic ethylene-bridged PMO NPs were successfully loaded using a ruthenium oxide catalyst by means of sonication and evaporation under mild conditions. The obtained catalytic system, termed Ru@M-Ethylene-PMO NPS, was applied in a reduction reaction of aromatic compounds. It exhibited very high catalytic behavior with easy separation from the reaction medium by applying an external magnetic field.

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Poscher, Vanessa, George S. Pappas, Oliver Brüggemann, Ian Teasdale, and Yolanda Salinas. "Hybrid Porous Microparticles Based on a Single Organosilica Cyclophosphazene Precursor." International Journal of Molecular Sciences 21, no. 22 (November 13, 2020): 8552. http://dx.doi.org/10.3390/ijms21228552.

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Porous organosilica microparticles consisting of silane-derived cyclophosphazene bridges were synthesized by a surfactant-mediated sol-gel process. Starting from the substitution of hexachlorocyclotriphosphazene with allylamine, two different precursors were obtained by anchoring three or six alkoxysilane units, via a thiol-ene photoaddition reaction. In both cases, spherical, microparticles (size average of ca. 1000 nm) with large pores were obtained, confirmed by both, scanning and transmission electron microscopy. Particles synthesized using the partially functionalized precursor containing free vinyl groups were further functionalized with a thiol-containing molecule. While most other reported mesoporous organosilica particles are essentially hybrids with tetraethyl orthosilicate (TEOS), a unique feature of these particles is that structural control is achieved by exclusively using organosilane precursors. This allows an increase in the proportion of the co-components and could springboard these novel phosphorus-containing organosilica microparticles for different areas of technology.

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Makarychev, Yuri, Natalia Gladkikh, Ivan Arkhipushkin, and Yuri Kuznetsov. "Corrosion Inhibition of Low-Carbon Steel by Hydrophobic Organosilicon Dispersions." Metals 11, no. 8 (August 11, 2021): 1269. http://dx.doi.org/10.3390/met11081269.

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This article proposes a method for obtaining stable hydrophobic inhibitor dispersions, where the micelle core contains a hydrophobic solvent, a corrosion inhibitor and an organosilane. Such compositions can be used as polymer-type corrosion inhibitors for low-carbon steel. Using electrochemical methods, corrosion tests and X-ray photoelectron spectroscopy, features of the formation of polymeric layers of hydrophobic organosilicon dispersions were studied.

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Li, Hongwei, Junhui Pan, Chengtao Gao, Mengyu Ma, Liangyu Lu, Yuzhu Xiong, and Fuping Dong. "Mercapto-Functionalized Porous Organosilica Monoliths Loaded with Gold Nanoparticles for Catalytic Application." Molecules 24, no. 23 (November 29, 2019): 4366. http://dx.doi.org/10.3390/molecules24234366.

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Porous organosilica monoliths have attracted much attention from both the academic and industrial fields due to their porous structure; excellent mechanical property and easily functionalized surface. A new mercapto-functionalized silicone monolith from a precursor mixture containing methyltrimethoxysilane; 3-mercaptopropyltrimethoxysilane; and 3-mercaptopropyl(dimethoxy)methylsilane prepared via a two-step acid/base hydrolysis–polycondensation process was reported. Silane precursor ratios and surfactant type were varied to control the networks of porous monolithic gels. Gold nanoparticles were loaded onto the surface of the porous organosilica monolith (POM). Versatile characterization techniques were utilized to investigate the properties of the synthesized materials with and without gold nanoparticles. Scanning electron microscopy was used to investigate the morphology of the as-synthesized porous monolith materials. Fourier transform infrared spectroscopy was applied to confirm the surface chemistry. 29Si nuclear magnetic resonance was used to investigate the hydrolysis and polycondensation of organosilane precursors. Transmission electron microscopy was carried out to prove the existence of well-dispersed gold nanoparticles on the porous materials. Ultraviolet–visible spectroscopy was utilized to evaluate the high catalytic performance of the as-synthesized Au/POM particles

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Wang, Qian. "The Effect of Temperature Elevation on Microwave-Transmitting Property of Organosilicone-Matrix Radome." Materials Science Forum 848 (March 2016): 174–78. http://dx.doi.org/10.4028/www.scientific.net/msf.848.174.

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In this paper, both the permittivity and the microwave transmittance properties of organosilicon-matrix composites under different temperatures have been studied. In order to investigate the reason for the changing of dielectric property, both TGA and high-temperature dielectric spectrum measurement have been carried out. A theoretical model of radome, with a temperature gradient distribution, has been built to analyze the dependence of microwave transmittance property on temperature. Based on the experimental results, we can optimize the effective operating temperature of this kind of organosilicone-matrix composites.

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Zebardasti, Ali, Mohammad Dekamin, and Esmail Doustkhah. "The Isocyanurate-Carbamate-Bridged Hybrid Mesoporous Organosilica: An Exceptional Anchor for Pd Nanoparticles and a Unique Catalyst for Nitroaromatics Reduction." Catalysts 11, no. 5 (May 12, 2021): 621. http://dx.doi.org/10.3390/catal11050621.

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Hybridisation of mesoporous organosilicas (MO) to reinforce the surface capability in adsorption and stabilisation of noble metal nanoparticles is of great attention in generating/supporting noble metal within their matrices and transforming them into efficient heterogeneous catalysts. Here, we used a unique hybrid of organic-inorganic mesoporous silica in which pore profile pattern was similar to the well-known mesoporous silica, SBA-15 for catalysis. This hybrid mesoporous organosilica was further engaged as a support in the synthesis and stabilisation of Pd nanoparticles on its surface, and then, the obtained Pd-supported MO was employed as a heterogeneous green catalyst in the conversion of aqueous p-nitrophenol (PNP) to p-aminophenol (PAP) at room temperature with efficient recyclability.

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López, María I., Dolores Esquivel, César Jiménez-Sanchidrián, Pascal Van Der Voort, and Francisco J. Romero-Salguero. "Thiol-Functionalized Ethylene Periodic Mesoporous Organosilica as an Efficient Scavenger for Palladium: Confirming the Homogeneous Character of the Suzuki Reaction." Materials 13, no. 3 (January 30, 2020): 623. http://dx.doi.org/10.3390/ma13030623.

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This work describes the synthesis of thiol-functionalized periodic mesoporous organosilicas (PMOs) prepared using the precursor 1-thiol-1,2-bis(triethoxysilyl)ethane, alone or mixed with 1,2-bis(triethoxysilyl)ethane. The thiol groups incorporated into the structure were found to be efficient for palladium binding. This has allowed these materials to be used as catalysts in the Suzuki cross-coupling reaction of bromobenzene and phenylboronic acid. Their performance has been compared to palladium-supported periodic mesoporous (organo)silicas and important differences have been observed between them. The use of different heterogeneity tests, such as hot filtration test and poisoning experiments, has provided a deep insight into the reaction mechanism and has confirmed that the reaction occurs in the homogeneous phase following a “release and catch” mechanism. Furthermore, the thiol-functionalized periodic mesoporous organosilica, synthesized using only 1-thiol-1,2-bis(triethoxysilyl)ethane as a precursor, has proven to be an efficient palladium scavenger.

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Wahab, M. Abdul, I. Kim, and C. S. Ha. "Framework Functionalization of Periodic Mesoporous Organosilica with 1,2-bis[3-(triethoxysilylpropyl)ureido] cyclohexane Function via Basic Co-condensation Self-Assembly." Journal of Nanoscience and Nanotechnology 8, no. 7 (July 1, 2008): 3532–38. http://dx.doi.org/10.1166/jnn.2008.110.

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The synthesized bis silylated long alkyl chain containing organosilicate precursor, 1,2-bis(3-(triethoxysilylpropyl)ureido)cyclohexane (BSPUCh) has been used as co-precursor with 1,2-bis (triethoxysilyl)ethane (BTSE) for the preparation of functional periodic mesoporous organosilicas (PMOs) via surfactant-mediated basic co-condensation self-assembly method. The various characterization techniques such as X-ray diffraction patterns (XRD), transmission electron microscope (TEM), N2 adsorption–desorption isotherms (BET), FT-IR, and 13C and 29Si CPMAS NMR spectroscopies were used to characterize the resulting structure of functionalized PMO mesostructures. Results obtained from XRD, TEM, and BET analysis clearly showed that the structural and pore arrangement of the functionalized PMOs were found to be dependent on the used concentration of BSPUCh. The functional PMOs showed well ordered mesophases when BSPUCh concentration was ≤9 wt% in the initial mixtures, whereas higher concentration of the BSPUCh always produced disordered hierarchical mesostructures with bimodal pore size distributions. The incorporation of BSPUCh also reduces the surface area, pore volume, pore size, and pore wall thickness of the functionalized nanostructures, indicating that the BSPUCh is incorporated in the pore channels of the PMOs. The solid-state 13C and 29Si NMR spectra showed that the BSPUCh organosilicate with non-hydrolyzable bridging ligands propylureidocyclohexane has been successfully covalently linked in the framework of the resulting functional PMOs.

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Gao, Ling, Feng Wei, Yu Zhou, Xiao Xing Fan, Ying Wang, and Jian Hua Zhu. "Periodic Mesoporous Organosilica Materials: Self-Assembly of Carbamothioic Acid-Bridged Organosilane Precursors." Chemistry - A European Journal 15, no. 33 (August 17, 2009): 8310–18. http://dx.doi.org/10.1002/chem.200900352.

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13

Cohen, Orit, Raed Abu-Reziq, and Dmitri Gelman. "Chiral enantiopure organosilane precursors for the synthesis of periodic mesoporous organosilicas." Tetrahedron: Asymmetry 28, no. 12 (December 2017): 1675–85. http://dx.doi.org/10.1016/j.tetasy.2017.10.032.

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Vakhneev, S. N., and Minggong Sha. "Preparation and Characterization of Magnetite – Silica Core – Shell Nanoparticles." International Journal of Circuits, Systems and Signal Processing 15 (September 15, 2021): 1457–63. http://dx.doi.org/10.46300/9106.2021.15.158.

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In this study, two types of ligands were introduced onto the surface of magnetite nanoparticles by hydrolysis and condensation of organosilicon reagents: organosilane-tetraethoxysilane (TEOS) and aminoorganosilane - aminopropyltriethoxysilane (APTES). It is shown that coatings based on SiO2 solve a double problem: first, they prevent the aggregation of nanoparticles and the oxidation of magnetite; secondly, they allow the surface to be modified with various specific ligands for biomedical applications due to terminal groups. It was shown, that after the modification of TEOS and APTES (in argon and in air), the Fe3O4 content decreases to 66, 42, and 36%, respectively. The formation of a silicon framework on the magnetite surface due to Fe-O-Si and Si-O-Si bonds was determined by IR spectroscopy. The identification of surface amino groups is complicated due to the superposition of absorption bands of NH2- and OH-groups. This opens new prospective for creation of tailored nanocomposites containing magnetite nanoparticles. These materials can be further used as sorbents for various applications.

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Liu, J., Q. Yang, L. Zhang, D. Jiang, X. Shi, J. Yang, H. Zhong, and C. Li. "Thioether-bridged Mesoporous Organosilicas: Mesophase Transformations Induced by the Bridged Organosilane Precursor." Advanced Functional Materials 17, no. 4 (January 26, 2007): 569–76. http://dx.doi.org/10.1002/adfm.200600379.

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Nakamura, Michihiro. "Biomedical applications of organosilica nanoparticles toward theranostics." Nanotechnology Reviews 1, no. 6 (December 1, 2012): 469–91. http://dx.doi.org/10.1515/ntrev-2012-0005.

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AbstractNanoparticles for biomedical applications have several advantages as multifunctional agents. Among various types of nanoparticles for biomedical applications, silica nanoparticles have characteristic positioning due to their inherent property. The recent development of silica nanoparticles is creating a new trend in nanomedicine. A novel type of silica nanoparticle, organosilica nanoparticle, is both structurally and functionally different from the common (inorgano)silica nanoparticle. The organosilica nanoparticles are inherent organic-inorganic hybrid nanomaterials. The interior and exterior functionalities of organosilica nanoparticles are useful for their multifunctionalization. Biomedical applications of organosilica nanoparticles are leading to a wide range of nanomedical fields such as basic biomedical investigations and clinical applications. Multifunctionalizations peculiar to organosilica nanoparticles enable the creation of novel imaging systems and therapeutic applications. In this review, I will introduce differences between (inorgano)silica nanoparticles and organosilica nanoparticles, and then focus on biomedical applications of organosilica nanoparticles toward theranostics.

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Wang, Yu, Pengpeng Wang, Lianxi Chen, Jie Li, and Zhenhui Liu. "Organosilane-assisted selective etching strategy for fabrication of hollow/rattle-type mesoporous organosilica nanospheres." Journal of Solid State Chemistry 266 (October 2018): 279–85. http://dx.doi.org/10.1016/j.jssc.2018.07.032.

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Mizoshita, Norihiro, Takao Tani, and Shinji Inagaki. "Syntheses, properties and applications of periodic mesoporous organosilicas prepared from bridged organosilane precursors." Chem. Soc. Rev. 40, no. 2 (2011): 789–800. http://dx.doi.org/10.1039/c0cs00010h.

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Niu, Dechao, Yongsheng Li, and Jianlin Shi. "Silica/organosilica cross-linked block copolymer micelles: a versatile theranostic platform." Chemical Society Reviews 46, no. 3 (2017): 569–85. http://dx.doi.org/10.1039/c6cs00495d.

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Silica/organosilica cross-linked block copolymer micelles are a novel class of hybrid materials that combine the advantages of amphiphilic block copolymers and silica/organosilica cross-linking agents into one unit. This Tutorial Review summarizes the recent progress in the design, synthesis and biomedical applications of various silica/organosilica cross-linked block copolymer micelles.

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Omar, Suheir, and Raed Abu-Reziq. "Magnetically Separable Chiral Periodic Mesoporous Organosilica Nanoparticles." Applied Sciences 10, no. 17 (August 28, 2020): 5960. http://dx.doi.org/10.3390/app10175960.

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We describe, for the first time, a successful strategy for synthesizing chiral periodic mesoporous organosilica nanoparticles (PMO NPs). The chiral PMO nanoparticles were synthesized in a sol–gel process under mild conditions; their preparation was mediated by hydrolysis and condensation of chiral-bridged organo-alkoxysilane precursor compounds, (OR‘)3Si-R-Si(OR‘)3, in the presence of cetyltrimethylammonium bromide (CTAB) surfactant. The resulting nanoparticles were composed merely from a chiral- bridged organo-alkoxysilane monomer. These systems were prepared by applying different surfactants and ligands that finally afforded monodispersed chiral PMO NPs consisting of 100% bridged-organosilane precursor. In addition, the major advancement that was achieved here was, for the first time, success in preparing magnetic chiral PMO NPs. These nanoparticles were synthesized by the co-polymerization of 1,1′-((1R,2R)-1,2-diphenylethane-1,2-diyl)bis(3-(3-(triethoxysilyl) propyl) urea) chiral monomer by an oil in water (o/w) emulsion process, to afford magnetic chiral PMO NPs with magnetite NPs in their cores. The obtained materials were characterized with high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray (EDX) spectroscopy, powder X-ray diffraction (XRD), solid-state NMR analysis, circular dichroism (CD) analysis, and nitrogen sorption analysis (N2-BET).

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Shirai, Soichi, Yasutomo Goto, Norihiro Mizoshita, Masataka Ohashi, Takao Tani, Toyoshi Shimada, Shi-aki Hyodo, and Shinji Inagaki. "Theoretical Studies on Si−C Bond Cleavage in Organosilane Precursors during Polycondensation to Organosilica Hybrids." Journal of Physical Chemistry A 114, no. 19 (May 20, 2010): 6047–54. http://dx.doi.org/10.1021/jp101242g.

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Liang, Yucang, Egil Sev Erichsen, Marianne Hanzlik, and Reiner Anwander. "Ethylene-bridged Mesoporous Organosilicas with Hexagonal and Cubic Symmetry." Zeitschrift für Naturforschung B 64, no. 11-12 (December 1, 2009): 1289–304. http://dx.doi.org/10.1515/znb-2009-11-1207.

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A series of ordered periodic mesoporous organosilicas (PMOs) with cubic and hexagonal symmetries were fabricated by using divalent surfactants [CH3(CH2)15NMe2(CH2)3NMe3]2+ 2Br− (C16-3-1) or binary surfactant mixtures [CH3(CH2)15NMe3]+ Br− (C16TABr) and C16-3-1 as structure-directing agents (SDAs) and 1,2-bis(triethoxysilyl)ethane (BTEE) as an organosilica source under various basic conditions. The shape/structure of surfactant, molar ratio of binary surfactant mixtures, and base concentration crucially affect the formation of distinct mesophases. Face-centered cubic Fm3̄̅m mesoporous organosilicas can be obtained by using various concentrations of divalent surfactant C16-3-1 or equimolar mixtures of divalent and monocationic surfactants as SDAs under basic conditions. Cubic Pm3̄̅n or 2D hexagonal p6mm mesophases can be synthesized by changing the molar ratio of the binary surfactant mixtures or the amount of the base NaOH. Use of monocationic C16TABr instead of C16-3-1 as template produced the hexagonal p6mm mesophase exclusively independent of the amount of the surfactant and the base. In addition, use of trimethylbenzene as expander molecule in the aforementioned binary surfactant template system caused a mesophase transformation from cubic Pm3̄̅n to p6mm symmetry. All samples were characterized by powder X-ray diffraction (PXRD) analysis and N2 physisorption. The formation of face-centered cubic Fm¯3m, primary cubic Pm3̄̅n, and hexagonal p6mm PMOs was also confirmed by transmission electron microscopy (TEM), revealing a good long-range ordering with regular arrays.Moreover, variation of the synthesis parameters resulted in a variety of different PMO morphologies, as ascertained by scanning electron microscopy (SEM). FT-IR and solid-state 13C and 29Si NMR spectroscopy further revealed that the organic groups were uniformly incorporated into the framework. The various BET surface areas of the PMOs range from 470 to 780 m2 g−1, while the pore diameters lie within a 26 to 30 °A range, as derived from N2 physisorption

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Poscher, Vanessa, and Yolanda Salinas. "Trends in Degradable Mesoporous Organosilica-Based Nanomaterials for Controlling Drug Delivery: A Mini Review." Materials 13, no. 17 (August 19, 2020): 3668. http://dx.doi.org/10.3390/ma13173668.

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The last few years of enhancing the design of hybrid mesoporous organosilica nanoparticleshas allowed their degradation under specific pathologic conditions, which finally is showing a lightin their potential use as drug delivery systems towards clinical trials. Nevertheless, the issueof controlling the degradation on-demand at cellular level still remains a major challenge, even if ithas lately been addressed through the incorporation of degradable organo-bridged alkoxysilanesinto the silica framework. On this basis, this mini review covers some of the most recent examplesof dierent degradable organosilica nanomaterials with potential application in nanomedicine,from degradable non-porous to mesoporous organosilica nanoparticles (MONs), functionalized withresponsive molecular gates, and also the very promising degradable periodic mesoporous organosilicamaterials (PMOs) only consisting of organosilica bridges.

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Wang, Jianqiang, Changqing Gu, Man Zhou, Wenqi Zhang, Zhiwei Wang, Mengyuan Lv, Cheng Guo, and Linbing Sun. "Synthesis of novel periodic mesoporous organosilicas with large content of lysine‐bridged organosilane skeleton." Micro & Nano Letters 12, no. 12 (December 2017): 1006–10. http://dx.doi.org/10.1049/mnl.2017.0202.

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Parambadath, Surendran, Aneesh Mathew, Su Yeon Kim, Sung Soo Park, and Chang-Sik Ha. "Fe3+-bis-ethylenediamine complex bridged periodic mesoporous organosilica for the efficient removal of arsenate and chromate." Pure and Applied Chemistry 90, no. 5 (April 25, 2018): 869–84. http://dx.doi.org/10.1515/pac-2017-0909.

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Abstract The direct removal of arsenate (AsO43−) and chromate (CrO42−) from water were achieved using a Fe3+-bis-ethylenediamine complex-bridged periodic mesoporous organosilica with a 20% organosilane content (Fe-EDPMO-20). The bridged Fe3+-bis-ethylenediamine complex was introduced to the pore wall of the PMO by combining the pre-complexation and co-condensation processes. N,N′-bis[3-(triethoxysilyl)propyl]ethylenediamine (TESEN) and tetramethyl orthosilicate (TMOS) as silica precursors were used with cetyltrimethylammonium bromide (CTABr) as a surfactant under basic conditions for the preparation of highly ordered Fe-EDPMO-20. Transmission electron microscopy, X-ray diffraction, and N2 adsorption-desorption measurements confirmed that the Fe-EDPMO-20 had an ordered hexagonal p6mm mesostructure. The material had a Brunauer-Emmett-Teller surface area of 734 m2 g−1, pore diameter of 2.6 nm, and pore volume of 0.61 cm3 g−1. UV-vis and X-ray photoelectron spectroscopy confirmed that Fe3+ was embedded in the coordination site by the nitrogen atoms from ethylenediamine. The adsorption efficiencies of arsenate and chromate ions by Fe-EDPMO-20 were examined as a function of pH, stirring time, amount of adsorbent, and initial concentration of metal ion solution. The maximum adsorption for arsenate and chromate were 156 and 102 mg g−1 within 6 and 24 h, respectively, at pH 4.

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Ren and Tsuru. "Organosilica-Based Membranes in Gas and Liquid-Phase Separation." Membranes 9, no. 9 (August 22, 2019): 107. http://dx.doi.org/10.3390/membranes9090107.

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Organosilica membranes are a type of novel materials derived from organoalkoxysilane precursors. These membranes have tunable networks, functional properties and excellent hydrothermal stability that allow them to maintain high levels of separation performance for extend periods of time in either a gas-phase with steam or a liquid-phase under high temperature. These attributes make them outperform pure silica membranes. In this review, types of precursors, preparation method, and synthesis factors for the construction of organosilica membranes are covered. The effects that these factors exert on characteristics and performance of these membranes are also discussed. The incorporation of metals, alkoxysilanes, or other functional materials into organosilica membranes is an effective and simple way to improve their hydrothermal stability and achieve preferable chemical properties. These hybrid organosilica membranes have demonstrated effective performance in gas and liquid-phase separation.

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Fu, Shengyang, Min Zhu, and Yufang Zhu. "Organosilicon polymer-derived ceramics: An overview." Journal of Advanced Ceramics 8, no. 4 (December 2019): 457–78. http://dx.doi.org/10.1007/s40145-019-0335-3.

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AbstractPolymer-derived ceramics (PDCs) strategy shows a great deal of advantages for the fabrication of advanced ceramics. Organosilicon polymers facilitate the shaping process and different silicon-based ceramics with controllable components can be fabricated by modifying organosilicon polymers or adding fillers. It is worth noting that silicate ceramics can also be fabricated from organosilicon polymers by the introduction of active fillers, which could react with the produced silica during pyrolysis. The organosilicon polymer-derived ceramics show many unique properties, which have attracted many attentions in various fields. This review summarizes the typical organosilicon polymers and the processing of organosilicon polymers to fabricate silicon-based ceramics, especially highlights the three-dimensional (3D) printing technique for shaping the organosilicon polymer- derived ceramics, which makes the possibility to fabricate silicon-based ceramics with complex structure. More importantly, the recent studies on fabricating typical non-oxide and silicate ceramics derived from organosilicon polymers and their biomedical applications are highlighted.

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Mizoshita, Norihiro, Takao Tani, and Shinji Inagaki. "ChemInform Abstract: Syntheses, Properties and Applications of Periodic Mesoporous Organosilicas Prepared from Bridged Organosilane Precursors." ChemInform 42, no. 24 (May 19, 2011): no. http://dx.doi.org/10.1002/chin.201124256.

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Jordan, David L., and Ann B. Burns. "Influence of Adjuvants on Hemp Sesbania (Sesbania exaltata) Control by Chlorimuron." Weed Technology 11, no. 1 (March 1997): 19–23. http://dx.doi.org/10.1017/s0890037x00041270.

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Hemp sesbania control by chlorimuron applied with crop oil concentrate at 1.0% v/v, BCH 815 at 1.0% v/v, methylated seed oil at 1.0% v/v, a blend of methylated seed oil and organosilicone surfactant at 0.5% v/v, organosilicone-based surfactant at 0.125% v/v, and nonionic surfactant at 0.25% v/v was evaluated in field studies in 1994 and 1995. Control by chlorimuron at 4.5 g ae/ha was greater when applied with BCH 815, organosilicone-based surfactant, and nonionic surfactant than with crop oil concentrate, methylated seed oil, and a blend of methylated seed oil and organosilicone surfactant. When chlorimuron was applied at 4.5 g/ha with BCH 815 or nonionic surfactant, hemp sesbania control was similar to that by chlorimuron at 9 g/ha applied with methylated seed oil, the blend of methylated seed oil and organosilicone surfactant, or organosilicone-based surfactant.

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Ma, Yong Sheng, and Xian Hui Sun. "Study on Application of Organo-Silicon in Papermaking Industry." Advanced Materials Research 396-398 (November 2011): 1333–36. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1333.

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Organosilicon compound are widely used in pulping and papermaking industry. The quality and capability of paper sheet are distinctly affected by the use of organosilicon. The application of organosilicon used as softening agent, defoamer agent, strengthening agent were introduced one by one in this paper.

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Wang, Jianqiang, Man Zhou, Changqing Gu, Wenqi Zhang, Mengyuan Lv, Cheng Guo, Linbing Sun, and Hailu Zhang. "Architecture of novel periodic mesoporous organosilicas based on the flexible skeleton of aspartic acid-bridged organosilane." Materials Letters 193 (April 2017): 299–304. http://dx.doi.org/10.1016/j.matlet.2017.01.133.

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Grudzien, Rafal M., Bogna E. Grabicka, Ryan Felix, and Mietek Jaroniec. "Polymer-templated organosilicas with hexagonally ordered mesopores: the effect of organosilane addition at different synthesis stages." Adsorption 13, no. 3-4 (October 31, 2007): 323–29. http://dx.doi.org/10.1007/s10450-007-9072-y.

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Culpepper, A. Stanley, David L. Jordan, Alan C. York, Frederick T. Corbin, and Yvonna Sheldon. "Influence of Adjuvants and Bromoxynil on Absorption of Clethodim." Weed Technology 13, no. 3 (September 1999): 536–41. http://dx.doi.org/10.1017/s0890037x00046169.

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The effect of nonionic surfactant, crop oil concentrate, organosilicone surfactant, methylated seed oil, and a blend of organosilicone surfactant and methylated seed oil on absorption of14C-clethodim was evaluated in barnyardgrass (Echinochloa crus-galli). Absorption of14C-label was greatest during the first 40 min after application when14C-clethodim was applied with methylated seed oil or a blend of methylated seed oil and organosilicone surfactant. These adjuvants increased the rate of absorption more than crop oil concentrate, organosilicone surfactant, or nonionic surfactant. Crop oil concentrate was more effective than organosilicone or nonionic surfactant in increasing absorption, with nonionic surfactant being more effective than organosilicone surfactant. These results generally agreed with the order of increasing efficacy of clethodim on barnyardgrass as affected by adjuvants in field experiments. Another study was conducted to determine the effect of bromoxynil on absorption and translocation of14C-clethodim in yellow foxtail (Setaria glauca). Bromoxynil reduced absorption of14C–clethodim 4, 8, and 24 h after application and also reduced the amount of14C-label translocated from the treated leaf. These data suggest that antagonism of clethodim control of yellow foxtail by bromoxynil observed in previous research can be attributed partially to decreased absorption and translocation of clethodim.

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Knezevic, Nikola Z., Chiara Mauriello Jimenez, Martin Albino, Aleksandar Vukadinovic, Ana Mrakovic, Erzsebet Illes, Djordje Janackovic, Jean-Olivier Durand, Claudio Sangregorio, and Davide Peddis. "Synthesis and Characterization of Core-Shell Magnetic Mesoporous Silica and Organosilica Nanostructures." MRS Advances 2, no. 19-20 (2017): 1037–45. http://dx.doi.org/10.1557/adv.2017.69.

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ABSTRACTInitial results en route toward construction of complex magnetic core-shell silica and organosilica nanotheranostics are presented. Magnetite nanoparticles are synthesized by three different methods and embedded within mesoporous silica and organosilica frameworks by different surfactant-templated procedures to produce three types of core-shell nanoparticles. Magnetite nanoparticles (15 nm in diameter) are embedded within mesoporous silica nanoparticles to produce cell-like material with predominantly one magnetite nuclei-resembling core per nanoparticle, with final particle diameter of ca. 150 nm, specific surface area of 573 m2/g and hexagonally structured tubular pores (2.6 nm predominant diameter), extended throughout the volume of nanoparticles. Two forms of spherical core-shell nanoparticles composed of magnetite cores embedded within mesoporous organosilica shells are also obtained by employing ethylene and ethane bridged organobisalkoxysilane precursors. The obtained nanomaterials are characterized by high surface area (978 and 820 m2/g), tubular pore morphology (2 and 2.8 nm predominant pore diameters), different diameters (386 and 100-200 nm), in case of ethylene- and ethane-composed organosilica shells, respectively. Different degree of agglomeration of magnetite nanoparticles was also observed in the obtained materials, and in the case of utilization of surfactant-pre-stabilized magnetite nanoparticles for the syntheses, their uniform and non-agglomerated distribution within the shells was noted.

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Shvets, D., T. Denisova, and V. Strelko. "Carbon, natural and synthetic sorbents for decontamination of objects of ecosystems from pathogenic microflora." Open Chemistry 1, no. 2 (June 1, 2003): 178–91. http://dx.doi.org/10.2478/bf02479267.

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AbstractPhysico-chemical characteristics and sorption activity of carbon, organosilica sorbents and their modified forms towards proteins, possessing specific activity, and cholerae vibrio have been studied. It was found, that carbon materials modified by copper (II) effectively extracts cholerae vibrio (100%) and may be recommended for disinfection of drinking water. Sorption capacity of organosilica sorbents and their modified by copper (II) forms towards pathogenic microflora (E.coli, St.aureus, Ps.aeruginosa) depending on the composition of the sorbents, concentration of the modified reagent, pH of medium have been evaluated. The rows of the increase of sorption of pathogenic microorganisms by synthetic sorbents in water-salt solutions were established: Al(III)<Zn(II)<Cu (II). It was shown that inhibiting effect of modified synthetic organosilica and natural sorbents towards such pathogenic microorganisms as E-coli, St.aureus Ps.aeruginosa and fungus Bacillus pyocyaneus accordingly is equal 80–98%.

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Guo, Meng, and Masakoto Kanezashi. "Recent Progress in a Membrane-Based Technique for Propylene/Propane Separation." Membranes 11, no. 5 (April 23, 2021): 310. http://dx.doi.org/10.3390/membranes11050310.

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The similar physico-chemical properties of propylene and propane molecules have made the separation process of propylene/propane challenging. Membrane separation techniques show substantial prospects in propylene/propane separation due to their low energy consumption and investment costs, and they have been proposed to replace or to be combined with the conventional cryogenic distillation process. Over the past decade, organosilica membranes have attracted considerable attention due to their significant features, such as their good molecular sieving properties and high hydrothermal stability. In the present review, holistic insight is provided to summarize the recent progress in propylene/propane separation using polymeric, inorganic, and hybrid membranes, and a particular inspection of organosilica membranes is conducted. The importance of the pore subnano-environment of organosilica membranes is highlighted, and future directions and perspectives for propylene/propane separation are also provided.

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Virtudazo, Raymond V. Rivera, Leonard dela Cruz, Eduardo R. Magdaluyo Jr., Emily V. Castriciones, and Herman D. Mendoza. "D-14 MORPHOLOGY AND STRUCTURE OF BIPHENYL-BRIDGED ORGANOSILICA(Session: Polymer/Wear)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 83. http://dx.doi.org/10.1299/jsmeasmp.2006.83.

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Li, Li, Yun-Long Wei, and Li-Wen Xu. "Organosilicon-Mediated Organic Synthesis (SiMOS): A Personal Account." Synlett 31, no. 01 (November 11, 2019): 21–34. http://dx.doi.org/10.1055/s-0039-1691496.

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The organosilicon-mediated organic synthesis (SiMOS) has attracted much attention over the recent decades. However, the use of organosilicon reagents with novel catalytic strategies remains to be explored. This Account summarizes our group’s progress mainly based on the application of a wide variety of organosilicon reagents, including allylic silanes, trifluoromethyl silane, acylsilanes, chlorosilanes, hydrosilanes, trimethylsilyldiazomethane, trimethylsiloxyfuran, silanols, α-trimethylsilylmethylacetate, and trimethylsilylcyanide, in catalysis and organic reactions. These transformations were proved to be alternative procedures for the construction of structurally diverse compounds.1 Introduction2 The Exploration of New Reactivity of Organosilicon Reagent in Organic Synthesis2.1 Allylic Silanes2.2 Trifluomethylsilane (TMSCF3)2.3 Acylsilanes2.4 Chlorosilanes and Hydrosilanes2.5 Trimethylsilyldiazomethane (TMSD)2.6 Trimethylsiloxyfuran2.7 Silanols2.8 Trimethylsilylcyanide (TMSCN)3 Conclusion and Perspective

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Ferré, M., R. Pleixats, M. Wong Chi Man, and X. Cattoën. "Recyclable organocatalysts based on hybrid silicas." Green Chemistry 18, no. 4 (2016): 881–922. http://dx.doi.org/10.1039/c5gc02579f.

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Doustkhah, Esmail, Sadegh Rostamnia, Masataka Imura, Yusuke Ide, Shiva Mohammadi, Christopher J. T. Hyland, Jungmok You, Nao Tsunoji, Behzad Zeynizadeh, and Yusuke Yamauchi. "Thiourea bridged periodic mesoporous organosilica with ultra-small Pd nanoparticles for coupling reactions." RSC Advances 7, no. 89 (2017): 56306–10. http://dx.doi.org/10.1039/c7ra11711f.

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Liu, Wenfei, Ying Tian, Yunlei Zhang, Kai Liu, Shuang Zhao, Junjie Zhang, Yunyan Su, et al. "Timely coordinated phototherapy mediated by mesoporous organosilica coated triangular gold nanoprisms." Journal of Materials Chemistry B 6, no. 23 (2018): 3865–75. http://dx.doi.org/10.1039/c8tb00541a.

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Haghighat, Mahdieh, Farhad Shirini, and Mostafa Golshekan. "Synthesis of Tetrahydrobenzo[b]pyran and Pyrano[2, 3-d]pyrimidinone Derivatives Using Fe3O4@Ph-PMO-NaHSO4 as a New Magnetically Separable Nanocatalyst." Journal of Nanoscience and Nanotechnology 19, no. 6 (June 1, 2019): 3447–58. http://dx.doi.org/10.1166/jnn.2019.16032.

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Immobilized NaHSO4 on core/shell phenylene bridged periodic mesoporous organosilica magnetic nanoparticles (Fe3O4@Ph-PMO-NaHSO4) as a new acidic magnetically separable nanocatalyst was successfully prepared in three steps: (i) preparation of Fe3O4 nanoparticles by a precipitation method, (ii) synthesis of an organic–inorganic periodic mesoporous organosilica structure with phenyl groups on the surface of Fe3O4 magnetic nanoparticles (MNPs) and (iii) finally adsorption of NaHSO4 on periodic mesoporous organosilica (PMO) network. The prepared organic–inorganic magnetic reagent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption–desorption and energy-dispersive X-ray (EDX) techniques. Finally, it was used as a reusable and new catalyst to promote the synthesis of tetrahydrobenzo[b]pyran and pyrano[2,3-d]pyrimidinone derivatives as important biologically active compounds. Eco-friendly protocol, high yields, short reaction times and easy and quick isolation of the products are the main advantages of this procedure.

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Bae, Jae Young, Ji-In Jung, and Byeong-Soo Bae. "Photochromism in spiropyran impregnated fluorinated mesoporous organosilicate films." Journal of Materials Research 19, no. 8 (August 2004): 2503–9. http://dx.doi.org/10.1557/jmr.2004.0315.

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Fluorinated mesoporous organosilicate films were synthesized by sol-gel spin-coating on a quartz substrate using (heptadecafluorodecyl)trimethoxysilane, tetramethylorthosilicate, and n-cetyltrimethylammonium chloride as the fluoro-precursor, silica source, and supramolecular template, respectively. The photochromism efficiency of photochromic dyes (spiropyran) increases in the order non-porous < hexagonal mesoporous < fluorinated mesoporous organosilicate films. The relatively high efficiency of the photochromism of spiropyran in fluorinated mesoporous organosilicate films suggests that such films are promising materials for applications as optical shutters and light modulators.

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Ueda, Suguru, Kumpei Yamada, Kaoru Konno, Minoru Hoshino, Katsunori Kojima, and Naotaka Tanaka. "A Theoretical Study of Growth of Solid-Electrolyte-Interphase Films in Lithium-Ion Batteries with Organosilicon Compounds." MRS Advances 4, no. 14 (2019): 801–6. http://dx.doi.org/10.1557/adv.2019.78.

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ABSTRACTWe attempt to reveal how electrolyte additives affect the structural evolution of the solid electrolyte interphase (SEI) film on the anode surface of a lithium-ion secondary battery. Employing the hybrid Monte-Carlo/molecular-dynamics method, we theoretically investigate the SEI film structures in organic liquid-electrolyte systems with and without an organosilicon additive. The results show that the excessive growth of the SEI film is suppressed by introducing the organosilicon additives. It is further elucidated that the decomposition products of the organosilicon molecules are stably aggregated in the vicinity of the anode surface, and protect the electrolyte solvents and the lithium salts from the further reductive decomposition. These findings imply that the organosilicon additive possibly improves the cycle performance of LIBs owing to the formation of the effective SEI film.

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Hu, Xiao Jun, Ya Nan Chen, Qing Bian, Ming Chen, Wen Qin, and Jing Feng. "Preparation and Properties of Organosilicon-Modified Epoxy Esters Resin." Advanced Materials Research 960-961 (June 2014): 148–51. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.148.

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Organosilicon-modified epoxy esters resin was successfully prepared by solution polymerization and the effect of content of silica sol and silane coupling agent (KH560) on the resistance to water, acid, alkali and film dry, the polymerization mechanism, structure were studied, respectively. The results showed that: compared with the properties of resistance to water, acid, alkali and film dry of pure epoxy esters resin, to some extent, those of organosilicon-modified epoxy esters resin had been improved a lot. The properties of resistance to water, acid, alkali and aging increased at first and then changed little with the increase of the content of organosilicon. Especially, the comprehensive performance of composite resin was relatively excellent when the content of silica sol and KH560 was 10%, respectively. Keywords: Organosilicon; epoxy esters resin; silane coupling agent; solution polymerization

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Tao, Jun, Kun Chen, Xiaodan Su, Lili Ren, Junjie Zhang, Lei Bao, Heng Dong, Guangming Lu, Zhaogang Teng, and Lianhui Wang. "Virus-mimicking mesoporous organosilica nanocapsules with soft framework and rough surface for enhanced cellular uptake and tumor penetration." Biomaterials Science 8, no. 8 (2020): 2227–33. http://dx.doi.org/10.1039/c9bm01559k.

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Rahmani, Saher, Arnaud Chaix, Dina Aggad, Phuong Hoang, Basem Moosa, Marcel Garcia, Magali Gary-Bobo, et al. "Degradable gold core–mesoporous organosilica shell nanoparticles for two-photon imaging and gemcitabine monophosphate delivery." Mol. Syst. Des. Eng. 2, no. 4 (2017): 380–83. http://dx.doi.org/10.1039/c7me00058h.

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Mauriello-Jimenez, Chiara, Jonas Croissant, Marie Maynadier, Xavier Cattoën, Michel Wong Chi Man, Julien Vergnaud, Vincent Chaleix, et al. "Porphyrin-functionalized mesoporous organosilica nanoparticles for two-photon imaging of cancer cells and drug delivery." Journal of Materials Chemistry B 3, no. 18 (2015): 3681–84. http://dx.doi.org/10.1039/c5tb00315f.

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Özel, Aslı, and Hüseyin Çimenoğlu. "An Overview on Silane Based Metal Pretreatments for Powder Painting." Diffusion Foundations 9 (October 2016): 16–29. http://dx.doi.org/10.4028/www.scientific.net/df.9.16.

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This work provides an overview of organosilane metal pretreatments with a focus on water-based systems. Furthermore, this work aims to point out the key notes for organosilane technology to be fully transferred to industry.

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Yuan, Zong Yang, Hong Yao Sun, Zheng Yang, Ming Xia Shen, and Guo Liang Shan. "Status of Site Test Methods of Organosilicon Hydrophobic Impregnants for Protecting Reinforced Concrete." Applied Mechanics and Materials 638-640 (September 2014): 1676–82. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1676.

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The organosilicon hydrophobic impregnants is applied on concrete to prevent rebar corrosion with its water repellent property which can prevent the intrusion of chloride and other harmful media. On-site the parameters of organosilicon hydrophobic impregnants of controlling quality consist of resistance to chloride penetration, water absorption of concrete and impregnating depth of organosilicon hydrophobic impregnants. The status of test methods of these parameters is summarized and their advantages and disadvantages are briefly reviewed. Finally some ideas are presented about shortcomings of test methods.

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Journal articles on the topic 'Organosilice'

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