نتایج جستجو برای: silica heterogeneous nanocomposite

تعداد نتایج: 175123  

Journal: :organic chemistry research 0
khodabakhsh niknam persian gulf university alireza hosseini persian gulf university

silica-bonded n-propyldiethylenetriamine (7) is employed as a recyclable heterogeneous solid base catalyst for the synthesis of 2-amino-3,5-dicarbonitrile-6-thiopyridines through pseudo four-component condensation reaction between aromatic aldehydes, malononitrile, and 2-amino-thiophenol in refluxing ethanol. silica-bonded n-propyldiethylenetriamine showed much the same efficiency when used in ...

2015
Tetyana M Budnyak Ievgen V Pylypchuk Valentin A Tertykh Elina S Yanovska Dorota Kolodynska

A hybrid nanocomposite material has been obtained by in situ formation of an inorganic network in the presence of a preformed organic polymer. Chitosan biopolymer and tetraethoxysilane (TEOS), which is the most common silica precursor, were used for the sol-gel reaction. The obtained composite chitosan-silica material has been characterized by physicochemical methods such as differential therma...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2004
G Garnweitner B Smarsly R Assink D R Dunphy C Scullin C J Brinker

Mesostructured lamellar nanocomposite films with alternating silica and organic layers containing poly(N-isopropropyl acrylamide) (PNIPAM) were prepared using evaporation-induced self-assembly. A suitable theoretical approach to analyze the small-angle X-ray scattering (SAXS) patterns of oriented lamellar two-phase systems was applied to the SAXS data of films of varying composition, providing ...

Journal: :Biomaterials 2012
Ming Ma Hangrong Chen Yu Chen Xia Wang Feng Chen Xiangzhi Cui Jianlin Shi

Uniform Au NRs-capped magnetic core/mesoporous silica shell nanoellipsoids (Au NRs-MMSNEs) were prepared by coating a uniform layer of Au NRs on the outer surface of a magnetic core/mesoporous silica shell nanostructure, based on a two-step chemical self-assembly process. This multifunctional nanocomposite integrate simultaneous chemotherapy, photo-thermotherapy, in vivo MR-, infrared thermal a...

Journal: :Acta chimica Slovenica 2017
Mohammad Ali Ghasemzadeh Bahar Molaei Mohammad Hossein Abdollahi-Basir Farzad Zamani

In this research an efficient synthesis of a novel nanocomposite including SiO2@(3-aminopropyl)triethoxysilane-coated cobalt oxide (Co3O4) nanocomposite has been reported by three step method. The structure and magnetic characterization of Co3O4@SiO2@NH2 have been done by using various spectroscopic analyses which include FT-IR, X-ray powder diffraction, scanning electron microscopy, transmissi...

Journal: Journal of Nanoanalysis 2014

In this study, a new silica gel based adsorbent was fabricated and its ability in separation and quantification of alkanes mixture was investigated. Silica gel (SiO2) is a polar absorbent which is mainly used to separate polar compounds. Also, the carbon materials such as activated carbon and recently carbon nanotube (CNTs), have been widely used for separation of nonpolar materials. Carbon nan...

This reaserch aims at functionalizing magnetic mesoporous silica with methacrylic acid-3-aminopropyltriethoxysilane (Fe3O4@MCM-41@MAA-APTES) applied for removal of methylene blue from aqueous solution. Several variables (such as pH, dye concentration, adsorbent amount and contact time) have been investigated. Under optimum conditions, maximum capacity of 87.71 mg g-1 of MB was obtained for the ...

Journal: Journal of Nanoanalysis 2017
Asghar Pasban Benyamin Mohammad Nazari Hanieh Malekzadeh Seyed Mojtaba Mostafavi,

In this study, a new silica gel based adsorbent was fabricated and its ability in separation and quantification of alkanes mixture was investigated. Silica gel (SiO2) is a polar absorbent which is mainly used to separate polar compounds. Also, the carbon materials such as activated carbon and recently carbon nanotube (CNTs), have been widely used for separation of nonpolar materials. Carbon nan...

Journal: :Nanoscale 2021

Mesoporous silica nanoparticles with properly designed textural properties and tailored release of corrosion inhibitors are highly efficient smart carriers for advanced anticorrosive nanocomposite coatings.

Journal: :Chemical communications 2011
Xingmao Jiang Ying-Bing Jiang C Jeffrey Brinker

Uniformly-sized, single-crystal alpha-quartz nanospheres have been synthesized at 200 °C and 15 atm under continuous stirring starting from uniform, amorphous Stöber silica colloids and using NaCl and alkali hydroxide as mineralizers. Quartz nanosphere size is controlled by the colloid particle size via direct devitrification. Uniform, high-purity nanocrystalline quartz is important for underst...

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