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Journal articles on the topic 'Gel silice'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Montero, E., M. A. García, M. A. Villegas, and J. Llopis. "Dependencia espectral de la eritrosina B con el pH en soluciones tampón y en recubrimientos sol-gel de silice." Boletín de la Sociedad Española de Cerámica y Vidrio 47, no. 1 (2008): 1–6. http://dx.doi.org/10.3989/cyv.2008.v47.i1.205.

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2

Fouzri, A., R. Dorbez-Sridi, and M. Oumezzine. "Étude des modifications structurales de l'eau confinée dans le gel de silice." Journal de Physique IV (Proceedings) 118 (November 2004): 85–92. http://dx.doi.org/10.1051/jp4:2004118010.

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3

Duhamel, Pierre, Didier Bénard, and Jean-Christophe Plaquevent. "Isomérisation oxaziridine-amide sur gel de silice obtention non classique d'une liaison peptidique." Tetrahedron Letters 26, no. 49 (1985): 6065–66. http://dx.doi.org/10.1016/s0040-4039(00)95126-8.

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4

Lombardi, J., P. Massard, and A. Perruchot. "Mesure expérimentale de la cinétique de formation d'un gel silicocalcique, produit de la réaction alcalis-silice." Cement and Concrete Research 27, no. 9 (1997): 1379–91. http://dx.doi.org/10.1016/s0008-8846(97)00128-2.

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5

Besbes, Néji, Houyem Jellali, Patrick Pale, Mohamed Lotfi Efrit, and Ezzeddine Srasra. "Isomerisation Catalysee Par le Gel de Silice et L'argile Activee de N-Acyl-2,2-Dimethylaziridines: Approche Mecanistique." Phosphorus, Sulfur, and Silicon and the Related Elements 185, no. 4 (2010): 883–89. http://dx.doi.org/10.1080/10426500903023079.

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6

Clause, O., L. Bonneviot, M. Che, et al. "Contrôle des étapes d’adsorption électrostatique et de greffage du complexe bis (éthylénediamine) cuivre(II) sur un gel de silice." Journal de Chimie Physique 86 (1989): 1767–75. http://dx.doi.org/10.1051/jcp/1989861767.

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7

Houngbedji, N., and K. Waisser. "Chromatographie en couche mince sur gel de silice avec double imprégnation ascendante à sens inversés à l'huile de silicone." Journal of Chromatography A 509, no. 2 (1990): 400–405. http://dx.doi.org/10.1016/s0021-9673(01)93099-7.

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8

Legendre, B., P. De Nadaï, J. Gilet, A. B. Tonnel, A. Tsicopoulos, and P. Lassalle. "072 Développement d’une méthode de purification de la CC chimiokine PARC/CCL18 et ses dérivés par passage sur gel de silice." Revue des Maladies Respiratoires 22, no. 5 (2005): 881. http://dx.doi.org/10.1016/s0761-8425(05)92484-4.

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9

Herbreteau, B., M. Lafosse, L. Morin-Allory, and M. Dreux. "Séparation des sucres et polyalcools par chromatographie en phase liquide sur gel de silice avec un détecteur évaporatif à diffusion de lumière." Analytica Chimica Acta 267, no. 1 (1992): 147–56. http://dx.doi.org/10.1016/0003-2670(92)85017-z.

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10

Montagu, M., P. Levillain, J. C. Chenieux, and M. Rideau. "Dosage d'alcaloides dihydrofuro[2,3-b]quinoleinium dns des tissus végétaux in vitro par chromatographie sur couche mince de gel de silice et fluorodensitométrie." Journal of Chromatography A 351 (January 1986): 144–49. http://dx.doi.org/10.1016/s0021-9673(01)83482-8.

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11

Xie, Yi Hui, Yan Hua Ding, Wen Qin Liu, Wen Ting Bai, and Li Ping Huang. "Microwave Assisted Synthesis of Quercetin-Selective MIPs Grafted on Silica Gel Surface." Advanced Materials Research 1120-1121 (July 2015): 608–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1120-1121.608.

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The silica gel surface was alkylated by silane coupling agent KH-570 under the microwave assisted and orthogonal experiment was adopted to optimize the silica gel surface silanized experimental conditions with synthetic yield as index. With quercetin as the template molecule, 4 - vinyl pyridine as the functional monomer, ethylene glycol dimethyl acrylate as the cross linking agent, azodiisobutyronitrile as initiator, under the microwave assisted in silane silicone surface quercetin molecularly imprinted polymer was successfully synthesized. Take selected quercetin as index, another orthogonal

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12

Balan, Poovarasi, Aaron Ng, Chee Beng Siang, R. K. Singh Raman, and Eng Seng Chan. "Effect of Nanoparticle Addition in Hybrid Sol-Gel Silane Coating on Corrosion Resistance of Low Carbon Steel." Advanced Materials Research 686 (April 2013): 244–49. http://dx.doi.org/10.4028/www.scientific.net/amr.686.244.

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Chromium pre-treatments of metal have been replaced by silane pre-treatments as more environmental friendly option. Nanoparticles can be added in the silane sol-gel network have been reported to improve corrosion resistance. In this work, the electrochemical corrosion resistance of low carbon steel coated with hybrid organic-inorganic sol-gel film filled with nanoparticles was evaluated. The sol-gel films have been synthesized from 3-glycidoxy-propyl-trimethoxy-silane (3-GPTMS) and tetra-ethyl-ortho-silicate (TEOS) precursors. These films have been impregnated with 300 ppm of silica or alumina

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13

Na, Young Joo, Sang Joon Park, Ji Hyeon Kim, and Jong Sung Kim. "The Preparation of Fluorescent Nano Dye-Silica Particles by Sol-Gel Process." Solid State Phenomena 124-126 (June 2007): 651–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.651.

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The core-shell structure of dye-silica nanoparticle has been prepared. The dye-silica nanoparticle can be used as a substitute of fluorescent dye for bio analysis. The hybrid organicinorganic nanoparticle was prepared by sol-gel process using organic modified silane as the coupling agent for flourescent dye and silica. The size of the particle was about 50 nm, which was measured by DLS and confirmed by SEM photograph. The fluorescent dye (fluorescein-5-maleimide) was reacted with (3-mercaptopropyl) trimethoxy silane to produce dye-silane compound, followed by the sol-gel reaction with tetraeth

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14

RAMOS, Vanessa Machado Babinski, Maurício Gammertt RÖHNELT, and Rodrigo BRAMBILLA. "HDPE/SILICA COMPOSITES- PART I: PREPARATION AND CHARACTERIZATION OF METHYLSILANE AND OCTYLSILANE-MODIFIED SILICAS." Periódico Tchê Química 16, no. 32 (2019): 263–78. http://dx.doi.org/10.52571/ptq.v16.n32.2019.281_periodico32_pgs_263_278.pdf.

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This paper reports the main results concerning the synthesis and characterization of methylsilane and octylsilane-modified silicas. The modification of the silicas with these groups aims to make the silica surface hydrophobic and thus compatible with high-density polyethylene (HDPE) in HDPE/silica composites. In the present work, two types of silica were organofunctionalized: a pyrogenic silica and a silica gel. The silicas were characterized by a series of complementary techniques with the objective of investigating the nature of the surface species and their textural and morphological charac

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15

Piyawongsiri, Thitirat, Chanapat Ammarinponchai, Supan Yodyingyong, Tshering Nidup, and Darapond Triampo. "Durable Superhydrophobic Silica Aerogel Coating from Hydrophobic Gel Synthesis." Key Engineering Materials 824 (October 2019): 156–62. http://dx.doi.org/10.4028/www.scientific.net/kem.824.156.

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Silica aerogel is a nanostructured porous solid material. It has a low bulk density, low thermal conductivity and can be hydrophobic. In this work, hydrophobic silica gel, a material used to form aerogel, is used instead of its powder form to avoid ultrafine air particles pollution. It is used to surface modified materials to make the materials superhydrophobic and still withstand physical abrasion that ordinary aerogel would not able to do. The superhydrophobic silica aerogel coating was designed by mixing the hydrophobic gel with DOW CORNING® 2405 resin as binder and varying DOWSIL™ Z-6137 s

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16

Giasuddin, Abul Bashar Mohammad, and David W. Britt. "Microwave Assisted Sol-Gel Synthesis of Silica-Spider Silk Composites." Molecules 24, no. 14 (2019): 2521. http://dx.doi.org/10.3390/molecules24142521.

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This study introduces a simple and environmentally friendly method to synthesize silica-protein nanocomposite materials using microwave energy to solubilize hydrophobic protein in an aqueous solution of pre-hydrolyzed organo- or fluoro-silane. Sol-gel functionality can be enhanced through biomacromolecule incorporation to tune mechanical properties, surface energy, and biocompatibility. Here, synthetic spider silk protein and organo- and fluoro-silane precursors were dissolved and mixed in weakly acidic aqueous solution using microwave technology. Scanning electron microscopy (SEM) and Atomic

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17

RAMOS, Vanessa Machado Babinski, Maurício Gammertt RÖHNELT, and Rodrigo BRAMBILLA. "HDPE/SILICA COMPOSITES-PART II: EFFECT OF SILICA PARTICLE SIZE AND SILICA MODIFICATION ON THE THERMAL AND MECHANICAL PROPERTIES." Periódico Tchê Química 16, no. 32 (2019): 287–305. http://dx.doi.org/10.52571/ptq.v16.n32.2019.305_periodico32_pgs_287_305.pdf.

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In this work, the effect of silica particle size and organosilane type used in the silica organofunctionalization on the thermal and mechanical properties of high-density polyethylene (HDPE)/silica composites were evaluated. HDPE/silica composites were prepared by the extrusion method using two types of silica: fumed silica, with nanometric particle size and silica gel, micrometric, modified with organosilanes containing methyl or octyl functional groups. Silicas were added to the HDPE at 1% v/v concentration. The addition of the silicas to the HDPE did not influence the melt (Tm) and the crys

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18

Luo, Jian Hui, Yuan Yang Li, Ping Mei Wang, et al. "A Facial Route for Preparation of Hydrophobic Nano-Silica Modified by Silane Coupling Agents." Key Engineering Materials 727 (January 2017): 353–58. http://dx.doi.org/10.4028/www.scientific.net/kem.727.353.

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Nano-silica was prepared using tetraethylorthosilicate (TEOS) as precursor by sol-gel technology based on stÖber method. These silica nanoparticals were further modified with silane coupling agents, i.e., Hexadecyltrimethoxysilane (HDTMS), dimethoxydiphenylsilane (DMMPS), to introduce organic functional groups on the surface of SiO2 nanoparticles. The Fourier transform-infrared (FTIR) spectra indicated that these silane coupling agents were anchored on the surface of silica particles. And the obtained organic–inorganic hybrid SiO2 particles showed an improvement in hydrophobicity, which can ef

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19

Zhou, Yingyu, and Hongling Chen. "Robust Super-Repellent Anisotropic Silica Films by Emulsion-Based Sol–Gel Growth." Nano 13, no. 01 (2018): 1850005. http://dx.doi.org/10.1142/s1793292018500054.

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In this paper, anisotropic SiO2 with different morphologies were synthesized through an emulsion-based one-pot method by adding various silane coupling agents. Silane coupling agents affected the growth of silica nanostructures at the oil/water interfaces. Robust super-repellent film that showed great durability under different harsh conditions were obtained by bonding the self-assembled anisotropic silica nanostructures (ASN) film to substrate by the commercial acrylic adhesive. The film switched from superhydrophobic (157.1[Formula: see text] to superhydrophilic (0[Formula: see text] after b

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20

Zhang, Qian, and Bai Mei Zhang. "Synthesis and Characterization of Silylated Kaolinite/Silica Core–Shell Nanoparticles." Applied Mechanics and Materials 105-107 (September 2011): 1760–63. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1760.

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Studies were conducted on the production of silane modified kaolinite/silica core-shell nanoparticles (SMKS). The SMKS nanoparticles were prepared via the sol–gel technique using tetraethyl oxysilane (TEOS) as the precursor to form silica shells on the surface of kaolinite particles followed with silane treatment. TEM of the unmodified kaolin (ORK) and SMKS revealed that a layer of ultrafine silica particles were deposited on the kaolinite surface to form a new kind of core–shell structure particles.

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21

Patel, Khushbu G., Nirendra M. Misra, and Rakshith R. Shettigar. "Preparation and Characterization of Silica Gel from Wheat Straw." International Journal of Chemical Engineering and Applications 7, no. 5 (2016): 344–47. http://dx.doi.org/10.18178/ijcea.2016.7.5.603.

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22

Kohjiya, Shinzo, and Yuko Ikeda. "Reinforcement of General-Purpose Grade Rubbers by Silica Generated In Situ." Rubber Chemistry and Technology 73, no. 3 (2000): 534–50. http://dx.doi.org/10.5254/1.3547604.

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Abstract The use of the sol—gel process on general-purpose grade rubbers is reviewed in the absence or presence of silane coupling agents. The sol—gel reactions of tetraethoxysilane (TEOS) in epoxidized natural rubber (ENR), styrene—butadiene rubber (SBR) or butadiene rubber (BR) vulcanizates produced silica generated in situ. This silica was found to be a good reinforcing agent by investigating tensile and dynamic mechanical properties and morphology observation by transmission electron microscopy (TEM). The amount of silica formed was limited by the degree of swelling of the rubber vulcaniza

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23

Hanai, Toshihiko. "In Silico Chromatography: Modeling a New Support for Alkyl-Bonded Phases and a Solvent Phase." Journal of Analytical, Bioanalytical and Separation Techniques 2, no. 2 (2017): 111–17. http://dx.doi.org/10.15436/2476-1869.17.1743.

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Chromatography is a tool to measure molecular interactions, and computational chemistry is a tool to explain molecular interactions. Therefore, reversed-phase liquid chromatography of acidic drugs using a pentyl- and an octyl-bonded silica gels was quantitatively analyzed in silico. A model pentyl- and an octyl-bonded silica gel and a methanol phases were constructed for docking with acidic drugs. Molecular interaction energy values based on van der Waals energy were obtained after docking an acidic drug into the model pentyl- or octyl-phases. Solvent effects, hydrogen bonding, and electrostat

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24

Popa, M., and J. M. Calderón-Moreno. "Cristalización de vidrios ricos en sílice preparados mediante sol-gel en el sistema alúmina-circona-sílice." Boletín de la Sociedad Española de Cerámica y Vidrio 43, no. 1 (2004): 63–66. http://dx.doi.org/10.3989/cyv.2004.v43.i1.617.

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25

Yang, Yong, Jia Long Fang, and Miao Lin. "Preparation and Application of Microencapsulated Flame Retardant Containing Phosphorus-Silicon." Advanced Materials Research 535-537 (June 2012): 419–24. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.419.

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The silica sol containing epoxy groups was prepared with tetraethoxysilane and silane coupling agent GPTMS as precursors by sol-gel technique and was used to encapsulate the microencapsulated flame retardant to enhance its flame retarding efficiency and water fastness for textile material. The prepared silica sol and gel were characterized by nano particle size analyzer, FT-IR spectrum analysis, energy spectrum analysis and SEM. The experimental results were proved that silica gel containing epoxy group was assuredly deposited on the surface of microencapsulated flame retardant. The cotton fab

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26

Morales, A., M. C. Bautista, and D. Cáceres. "Recubrimientos antirreflectantes de sílice sobre vidrio producidos por sol-gel." Boletín de la Sociedad Española de Cerámica y Vidrio 43, no. 2 (2004): 455–56. http://dx.doi.org/10.3989/cyv.2004.v43.i2.567.

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27

Arasuna, Akane, Masayuki Okuno, Tomoyuki Mizukami, et al. "The role of water in coesite crystallization from silica gel." European Journal of Mineralogy 25, no. 5 (2014): 791–96. http://dx.doi.org/10.1127/0935-1221/2013/0025-2331.

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28

A. Christy, Alfred. "Effect of Heat on the Adsorption Properties of Silica Gel." International Journal of Engineering and Technology 4, no. 4 (2012): 484–88. http://dx.doi.org/10.7763/ijet.2012.v4.416.

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29

Kuribayash, Kiyoshi, and Daisuke Ohmiya. "Photocatalytic properties of silica gel beads coated by Ag2O-V2O5." Epitoanyag - Journal of Silicate Based and Composite Materials 62, no. 1 (2010): 11–13. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2010.3.

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30

Heiman-Burstein, Dafna, Anna Dotan, Hanna Dodiuk, and Samuel Kenig. "Hybrid Sol–Gel Superhydrophobic Coatings Based on Alkyl Silane-Modified Nanosilica." Polymers 13, no. 4 (2021): 539. http://dx.doi.org/10.3390/polym13040539.

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Hybrid sol–gel superhydrophobic coatings based on alkyl silane-modified nanosilica were synthesized and studied. The hybrid coatings were synthesized using the classic Stöber process for producing hydrophilic silica nanoparticles (NPs) modified by the in-situ addition of long-chain alkyl silanes co-precursors in addition to the common tetraethyl orthosilicate (TEOS). It was demonstrated that the long-chain alkyl substituent silane induced a steric hindrance effect, slowing the alkylsilane self-condensation and allowing for the condensation of the TEOS to produce the silica NPs. Hence, followin

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31

Na, Moon Kyong, Dong Pil Kang, Hoy Yul Park, Myeong Sang Ahn, and In Hye Myung. "Properties of Nano-Hybrid Sol-Gel Materials Synthesized from Colloidal Silica-Silane Containing Epoxy Silane." Key Engineering Materials 336-338 (April 2007): 2278–81. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.2278.

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Three kinds of colloidal silica (CS)/silane sol solutions were synthesized in variation with parameters such as different acidity and reaction time. Sol solutions were prepared from HSA CS/ methyltrimethoxysilane (MTMS), LS CS/MTMS and LS CS/MTMS/γ -Glycidoxypropyltri methoxysilane (ES) solutions. In order to understand their physical and chemical properties, sol-gel coating films were fabricated on glass. Coating films on glass, obtained from LS/MTMS sol, had high contact angle, also, much enhanced flat surface in the case of LS/MTMS sol was observed in comparison with HSA/ MTMS sol. From all

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32

Prompawilai, Arisa, Supan Yodyingyong, and Darapond Triampo. "Effects of Tetraethyl Orthosilicate on Improving Adhesion Between Polyurethane Sponge/Hydrophobic Silica Gel Composite Materials for Oily Wastewater Treatment." Science of Advanced Materials 12, no. 2 (2020): 200–205. http://dx.doi.org/10.1166/sam.2020.3626.

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The environmental disposal of oily wastewater is a challenge to household and food industries. Cost-effective oil absorbent materials for oily wastewater treatment have been developed by various methods, one of which, the modification with hydrophobic particles. However, the oil absorbents still suffer high cost and low reusability because of the insufficient adhesion between supported material and the hydrophobic particles. Herein, a low cost and simple method to fabricate oil absorbents were reported by immersing commercial polyurethane (PU) sponge in hydrophobic silica gel. The adhesion bet

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33

Hua, Ye, Amanda Godin, and F. Handan Tezel. "Water Vapor Adsorption In Silica Gel For Thermal Energy Storage Application." Advanced Materials Letters 10, no. 2 (2018): 124–27. http://dx.doi.org/10.5185/amlett.2019.2181.

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34

Changsheng, He, Liu Xuegang, Liang Junfu, Zhao Huiming, Fan Xiaoqiang, and Yang Guangtao. "ICONE15-10492 The INET's progress of silica gel adsorption for zirconium." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2007.15 (2007): _ICONE1510. http://dx.doi.org/10.1299/jsmeicone.2007.15._icone1510_262.

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35

Saleemi, Sidra, Samander Ali Malik, Uzma Syed, and Anwaruddin Tanwari. "Investigation of Wash Durability of Silica Nanoparticle Coated 100% Cotton Reactive Dyed Fabric Treated by Sol-Gel Technique." Journal of Engineered Fibers and Fabrics 9, no. 4 (2014): 155892501400900. http://dx.doi.org/10.1177/155892501400900402.

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In this research a hydrophobic surface of 100% cotton woven fabric was developed by sol-gel technique. Fabric samples were dyed with Drimarene Reactive Red 5B and Drimarene Reactive Blue BR dyes (0.5% and 3% o.w.f) and then treated with a combination of silica nanoparticles, silane hydrophobes (alkyltrialkoxysilanes), and silane cross-linkers i.e, tetraethoxysilane (TEOS) and teramethoxysilane (TMOS) by dip-dry-cure process. After coating, wash durability of dyed samples was investigated for water repellency and water uptake according to AATCC standards. The effect of coating on dyeing behavio

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36

Grader, G. S., S. A. Melchior, Y. De-Hazan, S. Melamed, and G. E. Shter. "Entrapment of organosilicon molecules in nonhydrolytic alumina gels and thermal behavior of the resulting composite." Journal of Materials Research 16, no. 5 (2001): 1413–19. http://dx.doi.org/10.1557/jmr.2001.0197.

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This work describes the entrapment of tetrakis(trimethylsilyl)silane (TK) and tetrakis(chlorodimethylsilyl)silane (TKCl) in nonhydrolytic alumina gels, and the materials' thermal behavior. During gelation and drying TK and TKCl are physically entrapped in the gel up to a limit of Si/Al = 0.33. Above this limit, sublimation and decomposition of TK and TKCl occur during heating. A larger fraction of TKCl decomposition products is retained due to their higher reactivity. Below and above Si/Al = 0.33, the gel converts to mullite + α−Al2O3or mullite + amorphous silica, respectively. Conversion to h

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37

Khokhlova, T. D., Yu S. Nikitin, and A. L. Detistova. "Modification of Silicas and Their Investigation by Dye Adsorption." Adsorption Science & Technology 15, no. 5 (1997): 333–40. http://dx.doi.org/10.1177/026361749701500501.

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Various silicas (silica gel, silochrome, alumosilica, Aerosil and quartz) were modified by dehydroxylation, calcium hydroxide, aluminium chloride and organosilanes with hydrophobic and aminopropyl groups. The surface characteristics of the modified materials were evaluated by means of basic and acid dye adsorption from aqueous solution. The degree of modification, the hydrolytic stability of the organosilyl silicas and the rehydroxylation rate of the dehydroxylated silicas were determined via the kinetics of dye adsorption and their respective isotherms.

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38

Park, Hoy Yul, Dong Pil Kang, In Hye Myung, and Seog Young Yoon. "Properties of Coating Films Synthesized from Nano Colloidal Silica and Alkoxy Silanes." Materials Science Forum 510-511 (March 2006): 222–25. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.222.

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Colloidal silica/silane sol solutions were prepared in variation with the ratio of silane to colloidal silica. Such sol solutions were synthesized from colloidal silica/tetramethoxysilane (TMOS)/methyltrimethoxysilane(MTMS). Sol solutions were prepared by sol-gel reaction through two step reactions. To understand their physical and chemical properties, dip coating of sol solutions was performed on the glass substrates. Contact angle and thickness of coating films increased with increasing the amount of MTMS. The surface free energy of coating films decreased with increasing amount of MTMS. Coa

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39

Yang, Ze Hui, Ji Hui Wang, Yun Dong Ji, and Yan Zi Yin. "Characterization and Properties of Sol-Gel-Derived Polyurethane Acrylate/Silica Hybrid Materials." Advanced Materials Research 306-307 (August 2011): 1229–32. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1229.

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Novel organic –inorganic nanocomposite hybrid materials have been prepared by a sol-gel process. Tetraethoxysilane (TEOS) was used as inorganic source. Polyurethane acrylate (PUA) was the organic segment. 3-(trimethoxysilyl)propyl methacrylate (KH-570) was used as both a secondary inorganic source and a silane coupling agent to improve the compatibility of the organic and inorganic phases. X-ray diffraction indicates that silica was equally dispersed in polymer matrix. Furthermore, silica and polymer formed interpenetrating polymer network. Thermal property of the hybrid materials were checked

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40

Liu, Y. P., Z. R. Shen, L. Y. Li, et al. "Biomimetic Synthesis of Nanoporous Silica Templated by Copolypeptide in the Organic Gel System." Solid State Phenomena 121-123 (March 2007): 897–900. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.897.

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At neutral pH value and room temperature, nanoporous silica has been prepared through self-organization of synthetic block copolypeptide Poly(ethyl glycol)-b-poly(L-phenylalanine) (MPEG44–b-Phe7) and silicane in the organic gel system. In this system, π－π interaction between anilino-methyl triethoxy silicane and block copolypeptide MPEG44–b-Phe7 effectively controlled the growth of the silica precursors. SEM images show that the size of silica is relatively uniform with the length ranging from 20~50 μm and the diameter ranging from 2~5 μm. FT-IR spectra reveals that there exists nanoporous str

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41

Gorgol, Marek, Agnieszka Kierys, and Radosław Zaleski. "Positron Lifetime Annihilation Study of Porous Composites and Silicas Synthesized Using Polymer Templates." Defect and Diffusion Forum 373 (March 2017): 280–83. http://dx.doi.org/10.4028/www.scientific.net/ddf.373.280.

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The porous structure of polymer-silica composites, based on three polymer templates, which differ in a porosity and hydrophobicity, was examined using positron annihilation lifetime spectroscopy. Additionally, the investigation of silicas obtained after removal of polymers during calcination of composite materials, was performed. In composites based on hydrophobic polymers, silica condensates only in larger free volumes, while SiO2 deeply penetrates spaces between polymer chains, when the template is polar. Moreover, the structure of the silica gel, obtained after polymer removal, depends on c

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Liu, Zai Man, Ji Ping Lv, Bai Yu Li, and Nai Pu He. "Synthesis of Dendrimer-Like Polyamidoamine on Silica Gel Surface and their Adsorption Properties for Cr ³⁺." Advanced Materials Research 554-556 (July 2012): 299–302. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.299.

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Amino functional silica gel was synthesized by in-situ hydrolysis method in the present of silane coupling agent. Then dendrimer-like polyamidoamines based on the silica gel surface (PAMAM-SG) were prepared using Micheal addition of the amino and methyl acrylate, and ester-exchange of ethylene diamine and the ester group. The effects of solution pH, concentration and temperature on the adsorption capacity of PAMAM-SG for Cr3+were studied. The optimum pH range is 4.0-7.0. The adsorption rate decreased with increasing the time, but increased with increasing the temperature. The adsorption capaci

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Liu, Ming Xing, Ting Hu, Dong Lin Liu, Xian Wen Wang, and Kun Chen. "Synthesis of Semi-Terminated Silica Nanotubes." Advanced Materials Research 236-238 (May 2011): 1721–24. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1721.

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The two-step anodization process was adopted for the preparation of Al/Al2O3(AAO) template with about 100 nm porous diameter. Then, the semi-terminated silica nanotubes were synthesized with the AAO template by the sol-gel method. The AAO template and semi-terminatedsilica nanotubeswere observed by Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). The results showed that the porous diameter was increased with the increasing of the electrolyte concentration, the electrolysis temperature and the anodic oxidation voltage, respectively. The formation of semi-terminated

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Khalil, L. B., W. E. Mourad, and B. S. Girgis. "Changes in the Surface Area of Silica-supported 12-Molybdophosphoric Acid in Relation to the Degree of Loading and the Calcination Temperature." Adsorption Science & Technology 11, no. 2 (1994): 83–93. http://dx.doi.org/10.1177/026361749401100202.

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A technical silica gel (Grace-113) was impregnated with 12-molybdophosphoric solution to attain loadings of 0.72–13.4 wt.%. The air-dried solids were then calcined for 3 h at 400, 600 and 800°C, respectively, followed by determination of their N2 adsorption isotherms. The silica gel was thermally stable and suffered about 15% loss in area at 800°C. The impregnated silicas showed considerable decrease in surface area as a function of their heteropoly acid content. Two processes are suggested as taking part in the modification of pore structure: (1) diffusion of the aqueous heteropoly acid solut

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Yang, Ya-Jun, Xi-Wang Liu, Xiao-Jun Kong, et al. "Preparation and Evaluation of Oseltamivir Molecularly Imprinted Polymer Silica Gel as Liquid Chromatography Stationary Phase." Molecules 23, no. 8 (2018): 1881. http://dx.doi.org/10.3390/molecules23081881.

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To improve the chromatographic performance of an oseltamivir (OS) molecularly imprinted polymer (MIP), silica gel coated with an MIP layer for OS (OSMIP@silica gel) was prepared by the surface molecular imprinting technology on the supporter of porous silica gel microspheres. A nonimprinted polymer with the silica gel (NIP@silica gel) was also prepared for comparison. The obtained particles were characterized through FT–IR, scanning electron microscopy, specific surface area analysis, and porosity measurements. The results indicated that the polymer was successfully synthesized and revealed th

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Sriyanti, Sriyanti, Taslimah Taslimah, Nuryono Nuryono, and Narsito Narsito. "Pengaruh Keasaman Medium dan Imobilisasi Gugus Organik pada Karakter Silika Gel dari Abu Sekam Padi." Jurnal Kimia Sains dan Aplikasi 8, no. 3 (2005): 74–80. http://dx.doi.org/10.14710/jksa.8.3.74-80.

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Silica gel is well known as a material that may be used as adsorbent, host matrix for catalyst, etc. Hence, synthesis of silica gel from rice hull ash has been done by evaluation of the effect of medium acidity and organic group immobilized in the snythesis of silica gel.Synthesis of silica gel was done by adding sodium silicate solution from rice hull ash to hydrochloric acid until pH 3, 5 and 7. Immobilization of thiol group and amino group in silica was done by adding 3-mercaptopropyltrimethoxysilane or 3-aminopropyl-trimethoxysilane to sodium silicate solution and hydrochloride acid soluti

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Cho, Y. S. "Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules." Archives of Metallurgy and Materials 60, no. 2 (2015): 1221–25. http://dx.doi.org/10.1515/amm-2015-0102.

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AbstractIn this study, colloidal clusters decorated with fluorescent dyes were fabricated by evaporation-driven self-assembly using emulsion droplets as confining geometries. Silica microspheres were synthesized by Stober method followed by the modification with dye molecules through additional surface sol-gel reaction for the formation of thin silica shell. The surface of the resultant dye-doped silica microspheres was modified with hydrophobic silane coupling agent to disperse the particle suspension in organic solvent such as hexane. The fluorescent silica microspheres were self-assembled i

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Parin, Riccardo, Michele Rigon, Stefano Bortolin, Alessandro Martucci, and Davide Del Col. "Optimization of Hybrid Sol-Gel Coating for Dropwise Condensation of Pure Steam." Materials 13, no. 4 (2020): 878. http://dx.doi.org/10.3390/ma13040878.

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We developed hybrid organic–inorganic sol–gel silica coatings with good durability in harsh environment (high temperatures, high vapor velocities) and with slightly hydrophobic behavior, sufficient to promote dropwise condensation (DWC) of pure steam. DWC is a very promising mechanism in new trends of thermal management and power generation systems to enhance the heat transfer during condensation as compared to film-wise condensation (FWC). The sol–gel coatings have been prepared from methyl triethoxy silane (MTES) and tetraethyl-orthosilicate (TEOS) and deposited on an aluminum substrate. The

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Tao, Yao, Feng Zheng, Zhao Chen, Shuangshuang Chen, Xuemin Lu, and Qinghua Lu. "Comparison of hybrid polyimide films with silica and organosilica obtained via sol–gel process." High Performance Polymers 29, no. 9 (2016): 1049–57. http://dx.doi.org/10.1177/0954008316668242.

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A series of polyimide/silica (PI–S) and polyimide/organosilica (PI–OS) hybrid films were prepared via a sol–gel process from mixtures of poly(amic acid) (PAA) and tetraethoxysilane or a silane coupling agent in solution. The PAA was synthesized from bis-(3-phthalyl anhydride) ether and 1,4-bis (4-aminophenoxy) benzene. The hybrid films were produced via an imidization reaction to form silica particles or a silica network in a polymer matrix through a programmed heating process. The derived films were characterized and compared by Fourier transform infrared spectroscopy, field emission scanning

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Aimjaijit, Winit, Pipat Chaiwiwatworakul, and Surawut Chuangchote. "Synthesis of Silica Gel and Development of Coating Method for Applications in a Regenerative Air Dehumidifier." Applied Mechanics and Materials 839 (June 2016): 70–74. http://dx.doi.org/10.4028/www.scientific.net/amm.839.70.

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In order to control humidity in air conditioning system, various desiccants are used to dehumidify air in air conditioners. One of simple methods, which can be used to coat desiccant materials on surface of heat exchanger in air conditioners, is dip coating. Typical, desiccants used in dehumidifying system is silica gel in a form of solid-state powder. This powder has low adhesion with the heat exchanger surface. To improve adhesion of the silica gel powder, some glue is generally applied on the surface of heat exchanger. The dehumidification properties of silica gel, however, will be remarkab

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