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Journal articles on the topic '3-triethoxy'

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Published: 4 June 2025
Last updated: 23 June 2025

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1

Voronkov, M. G., O. S. Stankevich, and �. I. Dubinskaya. "Triethoxy(3-isothiocyanatopropyl)silane." Bulletin of the Russian Academy of Sciences Division of Chemical Science 41, no. 11 (1992): 2126–27. http://dx.doi.org/10.1007/bf00863387.

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2

VORONKOV, M. G., O. S. STANKEVICH, and E. I. DUBINSKAYA. "ChemInform Abstract: Triethoxy(3-isothiocyanatopropyl)silane." ChemInform 25, no. 29 (2010): no. http://dx.doi.org/10.1002/chin.199429229.

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3

Song, Wei, Wenbang Wei, Dandan Wang, and Shuangbao Zhang. "Preparation and properties of new plywood composites made from surface modified veneers and polyvinyl chloride films." BioResources 12, no. 4 (2017): 8320–39. http://dx.doi.org/10.15376/biores.12.4.8320-8339.

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To reduce the formaldehyde emissions of plywood used in furniture and interior decorations, new plywood composites made from surface modified veneers and polyvinyl chloride films were developed. These films were used as formaldehyde-free adhesives, and the veneer surfaces were modified with 3-aminopropyl(triethoxy)silane to enhance the compatibility with the films. Hot-pressing of composites was optimized using a response surface methodology. The effects of 3-aminopropyl(triethoxy)silane modification on various properties of veneers and composites were studied by Fourier transform infrared spectroscopy, contact angle, physico-mechanical, scanning electron microscope, dynamic mechanical, and thermogravimetric analyses. The optimum hot-pressing process for the composites was 183 °C (temperature), 74 s/mm (duration), and 312.5 g/m2 (adhesive). The modification with 3-aminopropyl(triethoxy)silane enhanced the hydrophobicity of veneer surfaces and improved the interfacial adhesion and physico-mechanical properties of composites. Adding 3% 3-aminopropyl(triethoxy)silane resulted in approximately 40% of decrease in water adsorption of composites and 30% increase in wet shear strength. The 3-aminopropyl(triethoxy)silane modification also improved the thermal stability of composites. The physico-mechanical properties of both the unmodified and modified composites met the requirements in Chinese national standard GB/T 9846 (2015) for the water-resistant plywood, indicating the potential of proposed composites as new building materials.
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4

Ju, Honghee, Euisub Jang, Chan Young Park, Won-Ki Lee, Taekyun Kim, and Jae-Hwan Chun. "Effect of 3-Isocaynatopropyl Triethoxy Silane on PU Adhesive." Adhesion and Interface 14, no. 1 (2013): 36–42. http://dx.doi.org/10.17702/jai.2013.14.1.036.

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5

Vandenberg, Elaine T., Lars Bertilsson, Bo Liedberg, et al. "Structure of 3-aminopropyl triethoxy silane on silicon oxide." Journal of Colloid and Interface Science 147, no. 1 (1991): 103–18. http://dx.doi.org/10.1016/0021-9797(91)90139-y.

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6

Chuah, Yon Jin, Shreyas Kuddannaya, Min Hui Adeline Lee, Yilei Zhang, and Yuejun Kang. "The effects of poly(dimethylsiloxane) surface silanization on the mesenchymal stem cell fate." Biomaterials Science 3, no. 2 (2015): 383–90. http://dx.doi.org/10.1039/c4bm00268g.

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7

Vítek, Josef, Markéta Urbanová, Zdeněk Bastl, et al. "Laser induced decomposition of 3-pyridinyl(trimethyl)-and 3-pyridinyl(triethoxy)silane." Journal of Analytical and Applied Pyrolysis 28, no. 2 (1994): 175–82. http://dx.doi.org/10.1016/0165-2370(93)00773-g.

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8

Volikov, Alexander B., Sergei A. Ponomarenko, Alexander Gutsche, Hermann Nirschl, Kirk Hatfield, and Irina V. Perminova. "Targeted design of water-based humic substances-silsesquioxane soft materials for nature-inspired remedial applications." RSC Advances 6, no. 53 (2016): 48222–30. http://dx.doi.org/10.1039/c6ra08636e.

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Water-based humic substances-silsesquioxane (HS-SQ) soft materials are synthesized by hydrolysis of (3-aminopropyl-triethoxy)-silane in the HS solution, ​immobilized onto sand columns, and used for intercepting azo dye from water.
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9

Zhou, Yongxian, Wei Chen, Pengfei Wang та Yimin Zhang. "Dense and thin 13X membranes on porous α-Al2O3 tubes: preparation, structure and deep purification of oxygenated compounds from gaseous olefin flow". RSC Advances 8, № 25 (2018): 13728–38. http://dx.doi.org/10.1039/c7ra12917c.

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Dense and thin 13X molecular sieve membranes on porous α-Al<sub>2</sub>O<sub>3</sub> tubes were successfully fabricated by a combination of 3-aminopropyl triethoxy silane surface modification and vacuum pre-coating sol for purifying trace oxygenated compounds from gaseous olefins.
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10

Vandenberg, Elaine, Hans Elwing, Agneta Askendal, and Ingemar Lundström. "Protein immobilization of 3-aminopropyl triethoxy surfaces: Characterization by detergent washing." Journal of Colloid and Interface Science 143, no. 2 (1991): 327–35. http://dx.doi.org/10.1016/0021-9797(91)90266-b.

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11

Chen, Lijun, Tantan Shao, Yilu Gong, and Xiuming Wang. "Preparation and characterization of novel VAc/VeoVa10/DBM/VTES quadripolymer latex emulsified with green surfactants." Progress in Rubber, Plastics and Recycling Technology 35, no. 4 (2019): 188–97. http://dx.doi.org/10.1177/1477760619861980.

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The novel vinyl acetate (VAc)/vinyl neo-decanoate (VeoVa10)/dibutyl maleate/triethoxy vinyl silane quadripolymer latex was prepared via the semi-continuous seeded emulsion polymerization emulsified with disodium laureth sulfosuccinate (AEMES) as anionic surfactant and beta-cyclodextrin (β-CD) mixture as emulsifier and initiated with potassium persulfate (KPS), respectively. The chemical compositions of copolymer was determined by Fourier transform infrared spectromer (FTIR). The glass transition temperature ( Tg) of the copolymer was measured by differential scanning calorimetry. The water resistance of the film was assessed by the water contact angle measurement. The conditions of preparing the novel latex were optimized and obtained as follows. The amount of AEMES and β-CD mixtures were 6 wt% and the mass ratio of AEMES to β-CD were 1:1. The dosage of KPS was 0.6 wt% and the mass ratio of VAc to VeoVa10 was 3:1. The amount of dibutyl maleate and triethoxy vinyl silane was 4% and 3%, respectively. In this case, the conversion percentage of the mixed monomers was 99.0% and the polymerization stability was good.
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12

Abdulhameed, Jamal Ismael, Ahmed H. Ali, and Ismail Hakkı Kara. "Developing Crumbed Rubber Tires / Epoxy Composite, by Surface Treatment with Different Silane Coupling Agents." Materials Science Forum 1077 (December 15, 2022): 39–45. http://dx.doi.org/10.4028/p-h41ugr.

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Converting used tries to useful materials and avoiding harmful effects of accumulation used tires, is a great economic and environmental issue. Using of crumbing rubber of used tires CRT as filler materials shows declining in mechanical properties of CRT/polymer composites as weak bonding between CRT and polymeric matrices. This work include, CRT surface treating by three kinds of silane coupling agent, Trimethoxysilyl propyl methacrylate, 3-chloropropyl triethoxy silane and Silicic acid, before using as filler materials in epoxy matrix. 10 wt. % of non-treated and treated CRT/epoxy composite specimens have been prepared and tested to evaluate effect of CRT surface treatment into composite mechanical properties. The results show that modulus of elasticity, tensile strength, and fracture toughness of treated CRT/epoxy composite could improve by 56%, 30%, 36% respectively comparing with that of non-treated CRT/epoxy, after treating by 3-chloropropyl triethoxy silane coupling agent, whereas surface treating by other types of silane coupling agents could produce less mechnical improvement but still better that of non-treated.
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13

Lin, Chenchy, William L. Hergenrother, and Ashley S. Hilton. "Mooney Viscosity Stability and Polymer Filler Interactions in Silica Filled Rubbers." Rubber Chemistry and Technology 75, no. 2 (2002): 215–45. http://dx.doi.org/10.5254/1.3544974.

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Abstract The change in Mooney viscosity (ML1+4) with aging was followed for silica filled compounds containing various silanes and polar additives. Several mechanisms for the aging stability are postulated and evaluated through experimentation. The type of silane or polar additive used can cause the ML1+4 to increase or even decrease during aging. When bis(triethoxy silanes) are used in silica filled rubbers, the ML1+4 growth during aging is caused by hydrolysis. Silica-silica bridging was found to be responsible for the ML1+4 growth in rubber compounds containing a more thermally stable polysulfide or a sulfur-free bis(triethoxy silane). When the bis(triethoxy silane) is bis(3-triethoxysilylpropyl) tetrasulfide (TESPT), a fraction of TESPT is attached to the unsaturated rubber to give polymer-silica attachments. These attachments further enhance the hydrolytic ML1+4 increase during aging. Chemical coating of the silica with a monofunctional silane or a physical coating with a trialkyl amine compound effectively stops the ML1+4 increase upon aging. The prevention of ML1+4 growth is so efficient that a reduction in the ML1+4 can be realized by absorption of ambient moisture. The extent of ML1+4 reduction caused by moisture depends on the degree of hydrophobation of the coated silicas. Hydrolytic stability was also studied with an amine or a sugar fatty acid ester that formed either strong or weak polar associations to the silica.
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14

Issa, Ahmed A., Marwa S. Elazazy, and Adriaan S. Luyt. "Polymerization of 3-cyanopropyl (triethoxy) silane: A kinetic study using gas chromatography." International Journal of Chemical Kinetics 50, no. 12 (2018): 846–55. http://dx.doi.org/10.1002/kin.21219.

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15

Vinodh, Rajangam, Yesudass Sasikumar, Muthiahpillai Palanichamy, Raji Atchudan, and Tansir Ahamad. "Bentonite clay incorporated 3-aminopropyl triethoxy silane composite (bentonite/APTES) for CO2 adsorption." Materials Letters 294 (July 2021): 129811. http://dx.doi.org/10.1016/j.matlet.2021.129811.

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16

Li, Liansheng, Xinsheng Liu, Ying Ge, Liyun Li, and Jacek Klinowski. "Intercalation and pillaring of zirconium bis(monohydrogenphosphate) with 3-[(triethoxy)silyl]-1-propylamine." Journal of Physical Chemistry 95, no. 15 (1991): 5910–14. http://dx.doi.org/10.1021/j100168a037.

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17

Phonglumjiakngam, P., and N. Pootrakulchote. "Synthesis of Self-organic Assembly Monolayers to Improve the Stability of Perovskite Films." IOP Conference Series: Materials Science and Engineering 1280, no. 1 (2023): 012012. http://dx.doi.org/10.1088/1757-899x/1280/1/012012.

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Abstract In recent years, photovoltaic devices based on perovskite materials have become one of the energy conversion field’s most in study topics. FAPbI3 stands out among a wide variety of perovskite structural materials with the advantages of a suitable band structure, long carrier diffusion distance, and so on. Unfortunately, the FAPbI3 perovskite films still lack some stability. It is well known that UV light and humidity strongly affect perovskite solar cell (PSC) performances, leading to the service life-time limitation of the device. Here, we propose strategies to improve the stability of PSCs by means of the interface engineering [1] between the electron transport layer and the perovskite active layer by inserting the self-organic assembled monolayers (SAMs). [2] The derivatives of Triethoxy(4-methoxyphenyl)silane (SAM1) and Triethoxy(3,4-dimethoxyphenyl)silane (SAM2) were synthesized using Grignard reaction [3] then inserted between the electron transport layer and perovskite active layer of PSC test devices in order to improve the hydrophobicity of the cell. Preliminary results showed that the perovskite active layers that have been modified with SAMs appear denser than those without modification. The overall conversion efficiency and stability of the SAMs-modified PSC devices will be further tested to prove more stable than those of unmodified devices.
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18

Zhang, Xian Yun, Xue Feng Song, Jin Tao Li, and Wen Cheng Yin. "Preparation of Modified Silica Sol, the Mechanism Analysis and the Applied Research." Applied Mechanics and Materials 687-691 (November 2014): 4319–22. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.4319.

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Using the methyl trimethoxy silane (MTMS) and methyl triethoxy siliance (MTES) each modified the surface of nanosilica sol.Through measuring the percent conversion of silance coupling agent and the water absorption of the cement paste.the optimal technical processes of the modified silica sol were obtained:: Mcoupling agent = 3:1,pH = 2,the synthesis temperature of 40 °C,the Synthetic time for 40 min. MTMS hydrophobic effect of modified silica sol significantly better than MTES, the higher the stability of the solution and the infrared spectrum analysis of the grafting mechanism of silane coupling agent.
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19

Xu, Zhenghe, Qingxia Liu, and J. A. Finch. "Silanation and stability of 3-aminopropyl triethoxy silane on nanosized superparamagnetic particles: I. Direct silanation." Applied Surface Science 120, no. 3-4 (1997): 269–78. http://dx.doi.org/10.1016/s0169-4332(97)00234-1.

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20

Samantaray, C. B., and Jeffrey T. Hastings. "Deep UV patterning of 3-amino-propyl-triethoxy-silane self-assembled molecular layers on alumina." Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena 29, no. 4 (2011): 041603. http://dx.doi.org/10.1116/1.3597437.

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21

Bahramnia, Hamed, Hamidreza Mohammadian Semnani, Ali Habibolahzadeh, Hassan Abdoos, and Fereshteh Rezaei. "The effect of 3-(triethoxy silyl) propyl amine concentration on surface modification of multiwall carbon nanotubes." Fullerenes, Nanotubes and Carbon Nanostructures 29, no. 1 (2020): 74–82. http://dx.doi.org/10.1080/1536383x.2020.1813719.

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22

Zhang, Xia Zhen, Pei Wang, Lian Liu, and Jian Bo Xiong. "Synthesis and Properties of Silicone Modified Acrylate Emulsion." Advanced Materials Research 535-537 (June 2012): 2491–94. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.2491.

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Silicone modified acrylate emulsion was successfully synthesized by pre-emulsion polymerization with the monomers of butyl acrylate(BA), methyl methacrylate(MMA), acrylic acid(AA), vinyl triethoxy silane(DB-151) using APS as initiator. The influence of reaction temperature, emulsifier system and silicone concentration on emulsion properties was discussed. The results showed that the overall performances of obtained emulsion became better with the condition: the reaction temperature 75°C, 6%~8% of silicone concentration, and 3% complex emulsifier system consist of the non-ionic /anionic/amphoteric emulsifier. The study also proved that silicone modified acrylic emulsion can improve water resistance and hardness of the resin.
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23

Taylor, A. P., R. I. Webb, J. C. Barry, H. Hosmer, R. J. Gould, and B. J. Wood. "Adhesion of microbes using 3-aminopropyl triethoxy silane and specimen stabilisation techniques for analytical transmission electron microscopy." Journal of Microscopy 199, no. 1 (2000): 56–67. http://dx.doi.org/10.1046/j.1365-2818.2000.00692.x.

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24

Wang, Jie Lin, Ying Li, Wei Chain, et al. "Synthesis and Characterization of Rare Earth/Polyurethane Composite Material." Advanced Materials Research 763 (September 2013): 125–29. http://dx.doi.org/10.4028/www.scientific.net/amr.763.125.

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The organic ligand sulfosalicylic acid (SSA) which was selected as molecular bridge for sensitization of terbium ions was modified by thionyl chloride (SOCl2) and 3-ammonium propyl triethoxy silane (APTES) to obtain the hybrid precursor SSA-Si. Then the solution of Tb (NO3)3was added in the presence of tetraethylorthosilicate (TEOS). The binary lanthanide organic/inorganic hybrid material was obtained. The ternary hybrid material was obtained by adding the solution of Tb (NO3)3and polyurethane. We investigated the thermal stability and luminescence properties of hybrids and found that the ternary hybrid materials exhibit better thermal stability and stronger emission intensity. Furthermore, compared with the binary mesoporous material Tb-(SSA-Si)3, the ternary mesoporous material Tb-(SSA-Si)3-PU exhibits the characteristic emission of the Tb3+ion with a higher luminescence intensity, suggesting that the introduction of polymer polyurethane into the mesoporous matrix is of benefit for the sensitization of Tb3+luminescence, by replacing H2O groups that can quench the luminescence of Tb3+ion.
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25

Xiao, Zuobing, Bin Zhang, Xingran Kou, et al. "High-Temperature Aroma Mitigation and Fragrance Analysis of Ethyl Cellulose/Silica Hybrid Microcapsules for Scented Fabrics." Coatings 12, no. 5 (2022): 711. http://dx.doi.org/10.3390/coatings12050711.

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Microencapsulation can improve the thermal stability of a fragrance, and composite wall materials are one way to further improve the thermal stability of microcapsules. This paper presents a facile approach for cotton fabric coatings by using cellulose/silica hybrid microcapsules. Lavender fragrance oil-loaded cellulose/silica hybrid microcapsules were one-step synthesized via emulsion solvent diffusion. The prepared microcapsules were found to be spherical in shape with a particle size distribution between 500 to 1000 nm. Due to the slow releasing of lavender fragrance oil in the capsules, the fragrance loss rate of (3-aminopropyl)triethoxysilane (APTES)-, triethoxy(3-glycidyloxypropyl)silane (GPTES)-, and (3-aercaptopropyl)trie-thoxysilane (MPTES)- modified cellulose/silica hybrid microcapsules are 25.2%, 35.1%, and 16.7% after six hours at 120 °C. E-nose and gas chromatography–mass spectrometry (GCMS) studies found that the fragranced cotton fabrics had good retention of characteristic aromas. It provides the basis for the application of the heating treatment of cotton fabrics in sterilization, bleaching, printing, and other processes.
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26

Zhang, Dian, Masakoto Kanezashi, Toshinori Tsuru, et al. "Development of PSQ-RO membranes with high water permeability by copolymerization of bis[3-(triethoxysilyl)propyl]amine and triethoxy(3-glycidyloxypropyl)silane." Journal of Membrane Science 644 (February 2022): 120162. http://dx.doi.org/10.1016/j.memsci.2021.120162.

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27

SUNDHARARAJAN, A., S. KOKILA, and JOHN S. AHMED. "IDENTIFICATION OF SECONDARY METABOLIES FROM PENTATROPIS MICROPHYLLA BY GC-MS ANALYSIS." IJISE 1, no. 1 (2019): 6. https://doi.org/10.5281/zenodo.2596388.

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Background: The present study was aimed to determine the presence of biomolecules in the ethanolic leaves extract of Pentatropic microphylla. Materials and Methods: Pentatropic microphylla leaves extract was used. Gas Chromatography Mass Spectrum equipment used for identification and determination of the bio active compounds. Results: The GC-MS results have shown the different type of secondary metabolites present in the extract. A total of 28 bio active compounds were identified by GC-MS. Out of 28 compounds 2 compounds have shown highly potent 1,6-Anhydro-&aacute;-D-glucopyranose (28.7332%) and Propane, 1,1,3-triethoxy (25.9192%) respectively. Conclusion: From the results, it is evident that Pentatropic microphylla contains various secondary metabolites, which may heal many diseases. Hence, it is recommended for further evaluation of its pharmacological activity.
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28

Sawawi, Marini, Nor Umirah Sudirman, Siti Kudnie Sahari, et al. "The Effect of Silane Treatment on Rice Husk / Phenol Formaldehyde Particleboard Mechanical Properties." International Journal of Engineering & Technology 7, no. 3.18 (2018): 53. http://dx.doi.org/10.14419/ijet.v7i3.18.16673.

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The effects of silane (3-aminopropyl triethoxy silane aqueous solution) treatment on the mechanical properties on rice husk particle board were investigated. Using phenol formaldehyde as the binder, the rice husks were treated at three different concentrations of silane (0.5 wt%, 2 wt%, 5 wt%) and untreated rice husk was set as control. The samples were characterized using Scanning Electron Microscope (SEM), 3-point bending test and water absorption behavior in accordance to ASTM1037. FTIR analysis was performed to verify the presence of the characteristic functional groups of untreated rice husk and silane treated husk. The results show that the mechanical properties were increased with silane treatment concentration. The swelling characteristics also improved as the concentration of silane increases less water were absorbed. Surface morphology of rice husk shows that the surface of the composites become rougher as the concentration of treatment was increased for better adhesion between fibers and the matrix.
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29

Miyashita, Masaaki, Masahide Hoshino, and Akira Yoshikoshi. "Sodium phenylseleno(triethoxy)borate, Na+(PhSeB(OEt)3]−: The reactive species generated from (PhSe)2 with NaBH4 in ethanol." Tetrahedron Letters 29, no. 3 (1988): 347–50. http://dx.doi.org/10.1016/s0040-4039(00)80092-1.

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30

Sanchez-Fernandez, Antonio, Laura Pena-Paras, Elisa M. Mendoza, et al. "Spectroscopic and Thermal Studies of Polyalkoxysilanes and Silica-Chitosan Hybrid Materials." Journal of Materials Science Research 5, no. 1 (2015): 1. http://dx.doi.org/10.5539/jmsr.v5n1p1.

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Polymers of organoalkoxysilanes (or polyalkoxysilanes) were synthesized through sol-gel process using different organosilanes: Tetraethylorthosilicate (TEOS), (3-Glycidyloxypropyl) trimethoxysilane (GPTMS), Trimethoxy(propyl)silane (TMPS), and/or Triethoxy(octyl)silane (EOS). Different carboxylic acids (acetic, formic, and citric) were used to prepare polyalkoxysilanes, with citric acid acting as a reactant rather than a catalyst for the sol-gel reaction. Silica-chitosan hybrid materials were synthesized reacting polyalkoxysilanes and chitosan, one of the most important and most studied natural polymers, through sol-gel process. The synthesized materials were characterized using Fourier transform infrared spectroscopy (FT-IR), thermogravimetrical analysis (TGA), differential Scanning Calorimetric (DSC) and solid-state Carbon-13 Nuclear Magnetic Resonance (solid-state &amp;nbsp;&amp;nbsp;13C-NMR) spectroscopy, obtaining information on the structural properties of each modified materials. The results obtained by NMR indicate that the oxirane group of GPTMS remains in all reaction products to form different polyalkoxysilanes.
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31

Puspita Sari, Indah, and Muhammad Bachri Amran. "Sintesis dan Karakterisasi SiO2@APTES-IIP Sebagai Material Fungsional Penjerap Ion Kadmium(II)." IJCA (Indonesian Journal of Chemical Analysis) 4, no. 1 (2021): 18–29. http://dx.doi.org/10.20885/ijca.vol4.iss1.art3.

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Sintesis SiO2@APTES-IIP dan SiO2@APTES-NIP melalui proses sol-gel melibatkan 3-amounium propyl triethoxy silane (APTES) sebagai monomer fungsional, tetraethylorthosilicate (TEOS) sebagai crosslinker, Cd (II) sebagai cetakan dan SiO2 sebagai inti. Karakterisasi SiO2@APTES-IIP dan SiO2@APTES-NIP dilakukan dengan menggunakan FTIR. Hasil karakterisasi dengan FTIR menunjukkan beberapa puncak penting pada bilangan gelombang 2939 cm-1 dan 1411 cm-1 yang berasal dari vibrasi gugus C-H serta pada bilangan gelombang 1564 cm-1 yang berasal dari vibrasi gugus N-H hal tersebut membuktikan bahwa silika gel telah berhasil terfungsionalisasi oleh monomer APTES. Morfologi dan komponen penyusun material SiO2@APTES-IIP dianalisis menggunakan SEM dan EDS. Berdasarkan metode batch SiO2@APTES-IIP memiliki kapasitas retensi sebesar 7,34 mg/g pada kondisi optimum pH 7 dan waktu kontak 90 menit. Hasil analisis menunjukkan bahwa, model isoterm adsorpsi mengikuti model isoterm adsorpsi Langmuir.
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32

Chen, Yongjun, Yuanfang Luo, Xiaohui Guo, Lijuan Chen, and Demin Jia. "The Synergistic Effect of Ionic Liquid-Modified Expandable Graphite and Intumescent Flame-Retardant on Flame-Retardant Rigid Polyurethane Foams." Materials 13, no. 14 (2020): 3095. http://dx.doi.org/10.3390/ma13143095.

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In this study, a nitrogen–phosphorus intumescent flame-retardant 3-(N-diphenyl phosphate) amino propyl triethoxy silane (DPES), the ionic liquid (IL) of 1-butyl-3-methyl-imidazole phosphate, and a phosphorous-containing ionic liquid-modified expandable graphite (IL-EG), were synthesized, and their molecular structures were characterized. The flame-retardant rigid polyurethane foams (RPUFs) were compounded with synergistic flame-retardant IL-EG/DPES to study the effects of the combination IL-EG and DPES on the pore structure, mechanical properties, thermal decomposition behavior and thermal decomposition mechanism of RPUF. The results showed that IL-EG/DPES had good thermal stability, and an excellent expansibility and char yield. The flame-retardant RPUF, modified with IL-EG and DPES at the ratio of 1:1, had a relatively uniform pore size, the highest compressive strength, and an excellent flame-retardant performance due to the form interwoven hydrogen bonds between IL-EG and DPES, as well as the new synergistic flame-retardant coating on the RPUF surface to restrict the transfer of gas or heat into the PU matrix.
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33

hui Wang, Qing, Xue song Li, Jia le Sun, and Dong dong Zhu. "Surface modification of Cu-coated carbon fiber for improved mechanical performance of Acrylonitrile Butadiene Styrene composites using 3-Aminopropyl triethoxy silane." Materials Letters 377 (December 2024): 137524. http://dx.doi.org/10.1016/j.matlet.2024.137524.

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34

Romanovs, Vitalijs, Viatcheslav Jouikov, and Jana Spura. "Synthesis and Electrochemical Study of 1,1′-Thienyl-Substituted Fused Bis-germatranes with a Core 5c-6e Hyperbond." Synthesis 50, no. 18 (2018): 3679–85. http://dx.doi.org/10.1055/s-0037-1610180.

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Novel fused bis-germatranes containing three hypercoordinated atoms (two Ge and one N) and substituted at the 1,1′-positions with bromo-thienyl groups [(3-bromo-2-thienyl)-, (3,5-dibromo-2-thienyl)-, and 3-(4-bromo)-2-thienyl] have been synthesized from the corresponding triethoxy(thienyl)germanes and tris(1,3-dihydroxypropan-2-yl)amine. The doubly degenerated HOMO and HOMO-1 in these compounds are localized on the thienyl substituents while a 5c-6e hyperbond of the bis-germatranyl core (C–Ge←N→Ge–C system) is only a lower lying HOMO-2. Square-wave pulse voltammetry in CH3CN/0.1 M Bu4NPF6 shows all three compounds to undergo reversible electrochemical oxidation affecting one thienyl substituent. The DFT B3LYP/Lanl2DZ//HF/6-311G(d,p) calculations of their cation radicals suggest the enhancement and shortening of the N→Ge intramolecular dative bond on the side of the oxidized thienyl unit because of the positive charge and the increased acceptor character of the latter; this is accompanied by the loss of the N→Ge dative bond on the side of the non-oxidized substituent and a substantial pyramidalization of the Ge atom.
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35

Hassan, Mohamed M., and Mona H. Alhalafi. "Synthesis, Structural Determination, and Antioxidant Activities of Acyclic and Substituted Heterocyclic Phosphonates Linearly Linked 4-hydroxy-2(1H)-quinolinone." Molecules 27, no. 18 (2022): 5960. http://dx.doi.org/10.3390/molecules27185960.

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The chemical reactivity of 3-[(E)-3-(dimethylamino)-2-propenoyl]-4-hydroxy-1-methy-2(1H)-quinolinone (1) towards some phosphorus reagents was studied. The enaminone 1 was cyclized into pyranoquinolinylphosphonate 2 via treatment with diethyl phosphite in basic medium. However, its reaction with triethoxy phosphonoacetate gave the substituted oxopyranylphosphonate 3. Using the same reaction conditions, both thioxopyridinylphosphonate 4 and oxopyranylphosphonate 5 were produced via a reaction of enaminone 1 with both diethyl 2-amino-2-thioxoethylphosphonate and diethyl vinylphosphonate, respectively, in low yields. In addition, the two novel oxopyridinylphosphonates 6 and 7 were obtained by treatment of enaminone 1 with a diethyl cyanomethylphosphonate reagent. Two oaxathiaphosphininyl derivatives, 8 and 9, were obtained by treatment of the enaminone 1 with O, O-diethyl dithiophosphoric acid under different reaction conditions. Diazaphosphininyl 11 and oxazaphosphininyl 12 derivatives were obtained in excellent yields using a P-phenylphosphonic diamide reagent under different reaction conditions. The treatment of the enaminone 1 with phosphorus pentasulfide produced the non-phosphorylated product thioxothiopyranoquinolinone 13. Finally, the enaminone was turned into oxathiaphosphininyl 14 using Lawesson’s reagent. The possible reaction mechanisms of the formation of these products were discussed. The structures of newly isolated products were established by elemental analysis and spectral tools. The compounds were evaluated for their antioxidant activities.
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Khan, R. A., A. J. Parsons, I. A. Jones, G. S. Walker, and C. D. Rudd. "Effectiveness of 3-Aminopropyl-Triethoxy-Silane as a Coupling Agent for Phosphate Glass Fiber-Reinforced Poly(caprolactone)-based Composites for Fracture Fixation Devices." Journal of Thermoplastic Composite Materials 24, no. 4 (2011): 517–34. http://dx.doi.org/10.1177/0892705710391622.

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37

Ahn, Byungkyu, Nam Park, Donghyuk Kim, and Wonho Kim. "INFLUENCE OF END-FUNCTIONALIZED SOLUTION STYRENE–BUTADIENE RUBBER ON SILICA-FILLED VULCANIZATES WITH VARIOUS SILICA–SILANE SYSTEMS." Rubber Chemistry and Technology 92, no. 2 (2018): 364–77. http://dx.doi.org/10.5254/rct.19.81522.

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ABSTRACT We investigated how end-functionalized solution styrene–butadiene rubber (SSBR) affects the vulcanizate structures and the physical properties of silica-filled vulcanizates using non-functionalized and end-functionalized SSBRs with aminopropylalkoxysilane. Two silane agents were used. Triethoxy(octyl)silane was used as a covering agent, and bis-[3-(triethoxysilyl)propyl]disulfide was applied as a coupling agent. The effects of three different silica–silane systems with a covering agent (CV), a coupling agent (CP), or with no silane (NS) were analyzed. In the CV and NS systems, the cross-link densities induced by the polymer and curing system were similar with respect to the end-functionalization. Further, the cross-link densities induced by the silica–silane system were similar, regardless of the end-functionalization. However, the CP system exhibited similar cross-link densities, irrespective of functionalization. Both the coupling agent and end-functional group chemically bonded with the silanol groups of silica, thus competing with each other and affecting the vulcanizate structure. However, increasing the silica content decreased the effect of end-functionalization because the content of the coupling agent increased, and the end-functional group was less mobile than the coupling agent's alkoxy group.
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38

Ulucan-Karnak, Fulden, and Sinan Akgöl. "A New Nanomaterial Based Biosensor for MUC1 Biomarker Detection in Early Diagnosis, Tumor Progression and Treatment of Cancer." Nanomanufacturing 1, no. 1 (2021): 14–38. http://dx.doi.org/10.3390/nanomanufacturing1010003.

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Early detection of cancer disease is vital to the successful treatment, follow-up and survival of patients, therefore sensitive and specific methods are still required. Mucin 1 (MUC1) is a clinically approved biomarker for determining the cancer that is a type I transmembrane protein with a dense glycosylated extracellular domain extending from the cell surface to 200–500 nm. In this study, nanopolymers were designed with a lectin affinity-based recognition system for MUC1 detection as a bioactive layer on electrochemical biosensor electrode surfaces. They were synthesized using a mini emulsion polymerization method and derivatized with triethoxy-3-(2-imidazolin-1-yl) propylsilane (IMEO) and functionalized with Concanavalin a Type IV (Con A) lectin. Advanced characterization studies of nanopolymers were performed. The operating conditions of the sensor system have been optimized. Biosensor validation studies were performed. Real sample blood serum was analyzed and this new method compared with a commercially available medical diagnostic kit (Enzyme-Linked ImmunoSorbent Assay-ELISA). The new generation nanopolymeric material has been shown to be an affordable, sensitive, reliable and rapid device with 0.1–100 U/mL linear range and 20 min response time.
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39

Dave, Pragnesh N., and Lakha V. Chopda. "A Review on Application of Multifunctional Mesoporous Nanoparticles in Controlled Release of Drug Delivery." Materials Science Forum 781 (March 2014): 17–24. http://dx.doi.org/10.4028/www.scientific.net/msf.781.17.

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In the early 1990s the discovery of the MCM-41 and the M41S family of mesoporous materials had open new era in the chemistry and biology. They have prominent application inbiotechnological, biomedical and heterogeneous catalysts. Mesoporous silica nanoparticles (MSNs) exhibit unique structural features like as their large surface areas, tunable pore sizes in nanometer and well-defined surface properties. MSN materials which are comprised of a honeycomb-like porous structure with hundreds of empty mesoporous channel that are able to encapsulate relatively large amounts of biomolecules. They are ideal candidate for constructing multifunctional materials that encapsulate a variety of functional nanostructured materials. Multifunctional MSN materials have become one of the most attractive areas in nanobiotechnology and nanomedicine for various disease diagnosis and therapy. Multifunctional MSN have been successfully developed as a multifunctional platform to deliver therapeutic and diagnostic agents. Multifunctional MSNs are a highly promising platform for intracellular controlled release of drugs. In this review we discuss the recent developments in design and fabrication of multifunctional mesoporous silica nanoparticles in as efficient drug delivery applications such as the site-specific delivery and intracellular controlled release of drugs.Abbreviations;APTES; 3-aminopropyl triethoxy sialne, ATP; Adenosine triphospahate, CD; cyclodextrinCPT; camptothecin, CS; Chitosan,CTAB; cyltrimethylammonium bromide,DNA; Deoxyribonucleic acid,DOX; doxorubicin,EDC; 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide,FD; fluorescein disodium,FSP;Fluroscent particle ,IBU;ibuprofen,MCM; mobil composition material, MPS; 3-trimethoxylsilyl propyl methacrylate, MS; mesoporous silica,MSN; mesoporous silica nanoparticle, MSNs; mesoporous silica nanoparticles,MSNP; mesoporous silica nanoparticle,NPS; nanoparticles;PFDTES;perfluorodecyltriethoxysilane, PAA; polyacrylic acid,PR;photo responsive,PMAA; polymethyl methacrylate,SBF; simulated body fluid,TEOS;tetraethyl orthosilicate,TUNA;Thio undecyl-tetraethyleneglycoestero-nitrobenzylethyldimethyl ammonium bromide.
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40

Qian, Yuehan, Fuhao Dong, Lizhen Guo, et al. "Preparation and properties of room temperature vulcanized silicone rubber using triethoxy(2-(4-methylcyclohex-3-en-1-yl)propyl)silane as a novel cross-linking agent." Polymer Degradation and Stability 173 (March 2020): 109068. http://dx.doi.org/10.1016/j.polymdegradstab.2019.109068.

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41

Colin-Torres, Jorge, Marcos M. González-Peña, Martin Hidalgo-Reyes, and Artemio Pérez-López. "Desempeño físico-mecánico de un biocompuesto de matriz epóxica reforzado con fibra de Agave angustifolia Haw." Revista Chapingo Serie Ciencias Forestales y del Ambiente 30, no. 1 (2024): 1–16. http://dx.doi.org/10.5154/r.rchscfa.2023.02.012.

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Introducción: Los biocompuestos reforzados con fibras naturales son importantes por el aprovechamiento de residuos biodegradables y renovables.Objetivo: Evaluar el desempeño físico-mecánico de un biocompuesto laminar desarrollado con una matriz de polímero epóxica de baja viscosidad, reforzada con fibras de bagazo de Agave angustifolia Haw.Materiales y métodos: Se elaboraron 12 paneles combinando tres contenidos de fibra (18 %, 24 % y 30 %) con cuatro longitudes (1 mm, 3 mm, 6 mm y mezcla). Se realizaron pruebas mecánicas y los resultados se compararon con un patrón (resina pura). En la interfaz fibra-matriz se evaluaron tres tratamientos químicos (bicarbonato de sodio, vinil triethoxy silano e hidróxido de sodio) y su efecto en las propiedades físicomecánicas; además, se evaluó la hibridación con fibra de vidrio.Resultados y discusión: La incorporación de fibra redujo 15.27 % la resistencia última a la tracción y flexión del biocompuesto; sin embargo, incrementaron hasta 1/3 los módulos de tracción y flexión con respecto al patrón. El mejor tratamiento químico (bicarbonato de sodio) incrementó las propiedades mecánicas de las fibras (dureza [46 %] y resistencia a la tracción [6 %] y flexión [24 %]) y la resistencia al impacto (38 %), mientras que la densidad y la resistencia a la humedad disminuyeron 17 % y 11 %, respectivamente. La combinación fibras agave/vidrio incrementó la resistencia a la flexión hasta 77.3 %.Conclusiones: Las fibras de A. angustifolia tienen potencial para implementarlas en la industria, ya que mejoran las propiedades mecánicas del material; además, su uso representaría una alternativa de manejo de los residuos de desecho.
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42

Jeong, Jae-Hyeuk, Chae-Woo Moon, Arkady I. Leonov, and Roderic P. Quirk. "Cure Kinetics for Silane Coupled Silica Filled SBR Compounds." Rubber Chemistry and Technology 75, no. 1 (2002): 93–109. http://dx.doi.org/10.5254/1.3547676.

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Abstract Vulcanization kinetics for silane-modified, silica-filled SBR has been investigated using the cure meter and swelling measurements to determine the crosslink density. The silane modifier was Si-69, bis(3-triethoxy-silylpropyl)tetrasulfane. To simulate the induction and curing periods as a function of temperature and compounding recipe, a three component kinetic model for curing was developed. The kinetic model consists of (a) curing in the bulk elastomer phase, (b) curing at the silica surface and (c) cross-phase curing between the bulk components and the silica surface. In order to describe the partitioning of reagents between the bulk and surface domains, the parameter reactive surface thickness,θ, was introduced into the kinetic model. An average value of 24.7 nm for θ was calculated from the kinetic data and the silica particle surface area. Physically significant model kinetic parameters were extracted from the experimental data using a cure meter at different temperatures for (a) bulk curing (no filler) using the model of Ding and Leonov; (b) curing at the silica surface with Si-69 (no sulfur); and (c) whole compound recipe. Crosslink density values determined from the shear modulus were in good agreement with results from equilibrium swelling measurements. Using experimental data from the cure meter studies at 160 and 180 °C, it was possible to calculate (predict) the cure meter data at 140 °C for several different recipes.
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43

Zhang, Zhengxiang, Haibin Zhou, Wentao Li, and Chao Tang. "Molecular Simulation of Improved Mechanical Properties and Thermal Stability of Insulation Paper Cellulose by Modification with Silane-Coupling-Agent-Grafted Nano-SiO2." Processes 9, no. 5 (2021): 766. http://dx.doi.org/10.3390/pr9050766.

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Cellulose is an important part of transformer insulation paper. Thermal aging of cellulose occurs in long-term operation of transformers, which deteriorates the mechanical properties and thermal stability of cellulose, resulting in a decrease in the transformer life. Therefore, improvement of the mechanical properties and thermal stability of cellulose has become a research hotspot. In this study, the effects of different silane coupling agents on the mechanical properties and thermal stability of modified cellulose were studied. The simulation results showed that the mechanical parameters of cellulose are only slightly improved by KH560 (γ-glycidyl ether oxypropyl trimethoxysilane) and KH570 (γ-methylacrylloxy propyl trimethoxy silane) modified nano-SiO2, while the mechanical parameters of cellulose are greatly improved by KH550 (γ-aminopropyl triethoxy silane) and KH792 (N-(2-aminoethyl)-3-amino propyl trimethoxy silane) modified nano-SiO2. The glass-transition temperature of the composite model is 24 K higher than that of the unmodified model. The mechanism of the change of the glass-transition temperature was analyzed from the point of view of free-volume theory. The main reason for the change of the glass-transition temperature is that the free volume abruptly changes, which increases the space for movement of the cellulose chain and accelerates the whole movement of the molecular chain. Therefore, modifying cellulose with KH792-modified nano-SiO2 can significantly enhance the thermal stability of cellulose.
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44

Viswanathan, Thimma Mohan, Kaniraja Chitradevi, Azar Zochedh, et al. "Guanidine–Curcumin Complex-Loaded Amine-Functionalised Hollow Mesoporous Silica Nanoparticles for Breast Cancer Therapy." Cancers 14, no. 14 (2022): 3490. http://dx.doi.org/10.3390/cancers14143490.

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The current study focuses on developing a tumour-targeted functionalised nanocarrier that wraps hollow mesoporous silica nanoparticles. The guanidine carbonate and curcumin are immobilised on the surface of 3-aminopropyl-triethoxy silane (APTES)-decorated hollow mesoporous silica nanoparticles (HMSNP), as confirmed through XPS and NMR analysis. XPS analysis demonstrates that the shape of the hysteresis loops is modified and that pore volume and pore diameter are consequently decreased compared to control. Guanidine (85%) and guanidine–curcumin complex (90%) were successfully encapsulated in HMSNAP and showed a 90% effective and sustained release at pH 7.4 for up to 72 h. Acridine orange/ethidium bromide dual staining determined that GuC-HMNSAP induced more late apoptosis and necrosis at 48 and 72 h compared with Gu-HMNSAP-treated cells. Molecular investigation of guanidine-mediated apoptosis was analysed using western blotting. It was found that cleaved caspases, c-PARP, and GSK-3β (Ser9) had increased activity in MCF-7 cells. GuC-HMSNAP increased the activity of phosphorylation of oncogenic proteins such as Akt (Ser473), c-Raf (Ser249), PDK1 (Ser241), PTEN (Ser380), and GSK-3β (Ser9), thus inducing cell death in MCF-7 cells. Altogether, our findings confirm that GuC-HMNSAP induces cell death by precisely associating with tumour-suppressing proteins, which may lead to new therapeutic approaches for breast cancer therapy.
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45

NARIMATSU, Akihiro, Ken-ichiro NAKAO, Mitsuo EGAWA, et al. "General pharmacological action of tritoqualine (TRQ; (.+-.)-(R*)-7-amino-4,5,6-triethoxy-3-((R*)-5,6,7,8-tetrahydro-4-methoxy-6-methyl-1,3-dioxolo (4,5-g) isoquinolin-5-yl) phthalide)." Folia Pharmacologica Japonica 87, no. 4 (1986): 457–78. http://dx.doi.org/10.1254/fpj.87.457.

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46

Li, Li, Li, et al. "Preparation and Electrochemical Characterization of Organic–Inorganic Hybrid Poly(Vinylidene Fluoride)-SiO2 Cation-Exchange Membranes by the Sol-Gel Method Using 3-Mercapto-Propyl-Triethoxyl-Silane." Materials 12, no. 19 (2019): 3265. http://dx.doi.org/10.3390/ma12193265.

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A new synthesis method for organic–inorganic hybrid Poly(vinylidene fluoride)-SiO2 cation-change membranes (CEMs) is proposed. This method involves mixing tetraethyl orthosilicate (TEOS) and 3-mercapto-propyl-triethoxy-silane (MPTES) into a polyvinylidene fluoride (PVDF) sol-gel solution. The resulting slurry was used to prepare films, which were immersed in 0.01 M HCl, which caused hydrolysis and polycondensation between the MPTES and TEOS. The resulting Si-O-Si polymers chains intertwined and/or penetrated the PVDF skeleton, significantly improving the mechanical strength of the resulting hybrid PVDF-SiO2 CEMs. The -SH functional groups of MPTES oxidized to-SO3H, which contributed to the excellent permeability of these CEMs. The surface morphology, hybrid structure, oxidative stability, and physicochemical properties (IEC, water uptake, membrane resistance, membrane potential, transport number, and selective permittivity) of the CEMs obtained in this work were characterized using scanning electron microscope and Fourier transform infrared spectroscopy, as well as electrochemical testing. Tests to analyze the oxidative stability, water uptake, membrane potential, and selective permeability were also performed. Our organic–inorganic hybrid PVDF-SiO2 CEMs demonstrated higher oxidative stability and lower resistance than commercial Ionsep-HC-C membranes with a hydrocarbon structure. Thus, the synthesis method described in this work is very promising for the production of very efficient CEMs. In addition, the physical and electrochemical properties of the PVDF-SiO2 CEMs are comparable to the Ionsep-HC-C membranes. The electrolysis of the concentrated CoCl2 solution performed using PVDF-SiO2-6 and Ionsep-HC-C CEMs showed that at the same current density, Co2+ production, and current efficiency of the PVDF-SiO2-6 CEM membrane were slightly higher than those obtained using the Ionsep-HC-C membrane. Therefore, our novel membrane might be suitable for the recovery of cobalt from concentrated CoCl2 solutions.
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47

Mendoza-Ortiz, Patricia A., Rafaela S. Gama, Omar C. Gómez, et al. "Sustainable Enzymatic Synthesis of a Solketal Ester—Process Optimization and Evaluation of Its Antimicrobial Activity." Catalysts 10, no. 2 (2020): 218. http://dx.doi.org/10.3390/catal10020218.

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The present study aims the enzymatic synthesis of solketal palmitate by esterification between solketal and palmitic acid using heptane as solvent. Lipases from Thermomyces lanuginosus (TLL), Candida rugosa type VII (CRL), and Pseudomonas fluorescens (PFL) were immobilized via interfacial activation on rice husk silica functionalized with triethoxy(octyl)silane (Octyl–SiO2) and used as biocatalysts. A loading of 20–22 mg of lipase/g of support was immobilized independently of the studied enzyme. TLL–Octyl–SiO2 was the most active biocatalyst in oil hydrolysis (656.0 ± 23.9 U/g) and ester synthesis (productivity of 6.8 mmol/min.gbiocat), and it has been chosen for further ester synthesis optimization. The effect of some important parameters such as biocatalyst concentration, reaction temperature and acid:alcohol molar ratio on the reaction has been evaluated using a central composite rotatable design at fixed mechanical stirring (240 rpm) and reaction time (15 min). Subsequently, the effect of reactants concentration and molecular sieve concentration has also been examined. Under optimal conditions (56 °C, acid:alcohol molar ratio of 1:3 with a palmitic acid concentration of 1 M, and 20% wt. of TLL–Octyl–SiO2 per volume of reaction mixture), 83% acid conversion was obtained after 150 min of reaction. The biocatalyst retained 87% of its initial activity after seven successive reaction batches. The product was identified by nuclear magnetic resonance analysis. Antimicrobial activity studies showed that the synthesized ester demonstrated antifungal activity against Candida albicans and Candida parapsilosis, with minimum inhibitory concentration (MIC) between 200 and 400 µg/mL, and bacteriostatic/fungistatic action—minimum microbicial concentration (MMC) &gt; 400 µg/mL.
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48

Kumar, Panwar, Kumar, Augustine, and Malhotra. "Biofunctionalized Nanostructured Yttria Modified Non-Invasive Impedometric Biosensor for Efficient Detection of Oral Cancer." Nanomaterials 9, no. 9 (2019): 1190. http://dx.doi.org/10.3390/nano9091190.

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We report results of the studies relating to the development of an efficient biosensor for non-invasive detection of CYFRA-21-1 cancer biomarker. We used a low dielectric constant material (nanostructured yttrium oxide, nY2O3) for the fabrication of the biosensing platform. The nY2O3 was synthesized via solvothermal process and functionalized using 3-aminopropyl triethoxy silane (APTES). Electrophoretic deposition (EPD) of the functionalized nanomaterial (APTES/nY2O3) onto an indium tin oxide (ITO)-coated glass electrode was conducted at a DC potential of 50V for 60s. The EDC-NHS chemistry was used for covalent immobilization of −COOH bearing monoclonal anti-CYFRA-21-1 onto −NH2 groups of APTES/nY2O3/ITO electrode. To avoid the non-specific interaction on the anti-CYFRA-21-1/APTES/nY2O3/ITO immunoelectrode, bovine serum albumin (BSA) was used. X-ray diffraction (XRD), transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM) were utilized for structural and morphological studies, whereas Fourier-transform infrared spectroscopy (FTIR) was used for the bonding analysis. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques were used for electrochemical characterization and response studies of fabricated electrodes. The fabricated immunosensor (BSA/anti-CYFRA-21-1/APTES/nY2O3/ITO) exhibited linearity in the range of 0.01–50 ng·mL−1, sensitivity of 226.0 Ω·mL·ng−1, and lower detection limit of 0.01·ng·mL−1. A reasonable correlation was observed between the results obtained using this biosensor and concentration of CYFRA-21-1 measured through ELISA (enzyme-linked immunosorbent assay) technique in salivary samples of oral cancer patients.
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49

Galata, Evdokia, Charitomeni M. Veziri, George V. Theodorakopoulos, George Em Romanos, and Evangelia A. Pavlatou. "Composite GO/Ceramic Membranes Prepared via Chemical Attachment: Characterisation and Gas Permeance Properties." Membranes 12, no. 12 (2022): 1181. http://dx.doi.org/10.3390/membranes12121181.

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Graphene oxide (GO) oligo-layered laminates were self-assembled on porous ceramic substrates via their simple dip-coating into aqueous GO dispersions. To augment the stability of the developed composite GO/ceramic membranes and control the morphology and stacking quality of the formed laminate, short-((3-glycidoxypropyl)trimethoxy silane-GLYMO, (3-aminopropyl)triethoxy silane-APTES), and long-chain (polydopamine-PDA) molecules were involved and examined as interfacial linkers. A comparative study was performed regarding the linker’s capacity to enhance the interfacial adhesion between the ceramic surface and the GO deposit and affect the orientation and assemblage characteristics of the adjacent GO nanosheets that composed the formed oligo-layered laminates. Subsequently, by post-filtrating a GO/H2O suspension through the oligo-layered laminate membranes, the respective multi-layered ones have been developed, whereas ethylenediamine (EDA) was used in the suspension as an efficient molecular linker that strongly bonds and interlocks the GO nanosheets. The definition of the best linker and approach was conducted on macroporous α-alumina disks, due to the use of inexpensive raw materials and the ability to fabricate them in the lab with high reproducibility. To validate the concept at a larger scale, while investigating the effect of the porous substrate as regards its micrometer-scale roughness and surface chemistry, specific chemical modifications that yielded membranes with the best gas permeability/selectivity performance were replicated on a commercial single-channel monolith with a ZrO2 microfiltration layer. XRD, Raman, ATR, FESEM, and XPS analyses were conducted to study the structural, physicochemical, surface, and morphological properties of the GO/ceramic composite membranes, whereas permeance results of several gases at various temperatures and trans-membrane pressures were interpreted to shed light on the pore structural features. Concerning the short-chain linkers, the obtained results ascertain that GLYMO causes denser and more uniform assembly of GO nanosheets within the oligo-layered laminate. PDA had the same beneficial effect, as it is a macromolecule. Overall, this study shows that the development of gas-separating membranes, by just dipping the linker-modified substrate into the GO suspension, is not straightforward. The application of post-filtration contributed significantly to this target and the quality of the superficially deposited, thick GO laminate depended on this of the chemically attached oligo-layered one.
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50

Kim, Jong-Ho, Sayed Mukit Hossain, Hui-Ju Kang, et al. "Hydrophilic/Hydrophobic Silane Grafting on TiO2 Nanoparticles: Photocatalytic Paint for Atmospheric Cleaning." Catalysts 11, no. 2 (2021): 193. http://dx.doi.org/10.3390/catal11020193.

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In this study, anatase titania was utilized to prepare a durable photocatalytic paint with substantially enhanced photoactivity towards NO oxidation. Consequently, to alleviate the choking effect of photocatalytic paint and incorporate self-cleaning properties, the parent anatase titania was modified with Al(OH)3 and a number of organosilane (tetraethyl orthosilicate, propyltrimethoxysilane, triethoxy(octadecyl)silane, and trimethylchlorosilane) coatings. A facile hydrolysis approach in ethanol was employed to coat the parent titania. To facilitate uniform dispersion in photocatalytic paint and strong bonding with the prevailing organic matrix, it is necessary to avail both hydrophobic and hydrophilic regions on the titania surface. Therefore, during the preparation of modified titania, the weight proportion of the total weight of alkyl silane and trimethylchlorosilane was adjusted to a ratio of 1:1. As the parent titania has few hydrophilic portions on the surface, tetraethyl orthosilicate was coated with an organic silane having an extended alkyl group as a hydrophobic group and tetraethyl orthosilicate as a hydrophilic group. When these two silane mixtures are hydrolyzed simultaneously and coated on the surface of parent titania, a portion containing a large amount of tetraethyl orthosilicate becomes hydrophilic, and a part containing an alkyl silane becomes hydrophobic. The surface morphology and the modified titania’s optical attributes were assessed using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), UV-Vis diffuse reflectance spectroscopy (DRS), and electrochemical impedance spectroscopy (EIS) analysis. Based on the advanced characterizations, the NO removal mechanism of the modified titania is reported. The modified titania coated at 20 wt.% on the ceramic substrate was found to remove ~18% of NO under one h of UV irradiation. An extensive UV durability test was also carried out, whereby the coated surface with modified titania was exposed to 350 W/m2 of UV irradiance for 2 weeks. The results indicated that the coated surface appeared to preserve the self-cleaning property even after oil spraying. Hence, facile hydrolysis of multiple organosilane in ethanol could be a viable approach to design the coating on anatase titania for the fabrication of durable photoactive paint.
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