نتایج جستجو برای: nanoporous silica

تعداد نتایج: 41668  

Journal: :Langmuir : the ACS journal of surfaces and colloids 2005
Dhaval A Doshi Andrew M Dattelbaum Erik B Watkins C Jeffrey Brinker Basil I Swanson Andrew P Shreve Atul N Parikh Jaroslaw Majewski

Single bilayer membranes of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) were formed on ordered nanocomposite and nanoporous silica thin films by fusion of small unilamellar vesicles. The structure of these membranes was investigated using neutron reflectivity. The underlying thin films were formed by evaporation induced self-assembly to obtain periodic arrangements of silica and sur...

A. Badiei F. Aleali Gh. Mohammadi Ziarani, N. Lashgari

Knoevenagel condensation between barbituric acid and aldehyde was investigated in the presence of sulfonic acid functionalized nanoporous silica (SBA-Pr-SO3H) and resulted in the formation of arylidene and bis-arylidene barbiturates. Excellent yields and short reaction times are related to the high efficiency of SBA-Pr-SO3H that the reactions take place easily in its nano-pores. SBA-Pr-SO3H as ...

2008
A. HAN V. K. PUNYAMURTULA

Gallium and mercury are employed as liquid phases in a nanoporous carbonbased energy absorption system. Owing to the large surface tensions, the nanopore surface is non-wettable. Pressure-induced infiltration is observed and defiltration is difficult. The energy absorption efficiency is much higher than that of previously investigated nanoporous silica-based systems. The nominal solid–liquid in...

A. Badiei F. Aleali Gh. Mohammadi Ziarani, N. Lashgari

Knoevenagel condensation between barbituric acid and aldehyde was investigated in the presence of sulfonic acid functionalized nanoporous silica (SBA-Pr-SO3H) and resulted in the formation of arylidene and bis-arylidene barbiturates. Excellent yields and short reaction times are related to the high efficiency of SBA-Pr-SO3H that the reactions take place easily in its nano-pores. SBA-Pr-SO3H as ...

2017
Paskalis Sahaya Murphin Kumar Thiripuranthagan Sivakumar Takeshi Fujita Ramasamy Jayavel Hideki Abe

Nanoporous Au-Fe alloy was synthesized via a wet chemistry route using ordered nanoporous silica as a hard template. The nanoporous Au-Fe consisted of aligned arrays of nanopores that were uniform in composition and ordered in hexagonal lattice, whereas Au-Fe nanoparticles synthesized without templates exhibited broad dispersions in the chemical composition and/or particle size. Nanoporous Au-F...

Journal: :Nano letters 2014
Jinlong Zhu Zewei Quan Yu-Shen Lin Ying-Bing Jiang Zhongwu Wang Jianzhong Zhang Changqing Jin Yusheng Zhao Zhenxian Liu C Jeffrey Brinker Hongwu Xu

High-pressure compression of water contained in nanoporous silica allowed fabrication of novel porous ice phases as a function of pressure. The starting liquid nanoporous H2O transformed to ice VI and VII at 1.7 and 2.5 GPa, respectively, which are 0.6 and 0.4 GPa higher than commonly accepted pressures for bulk H2O. The continuous increase of pressure drives the formation of a tetragonally dis...

Journal: :Chemical communications 2004
Weon-Sik Chae Sang-Wook Lee Sung-Jae Im Sik-Won Moon Wang-Cheol Zin Jin-Kyu Lee Yong-Rok Kim

Large-dimension heterogeneous nanoporous membranes were obtained by the formation of CdS doped mesoporous silica within the porous channels of alumina membranes.

2014
Michael G. Campbell Qingkun Liu Aric Sanders Julian S. Evans Ivan I. Smalyukh

Using liquid crystalline self-assembly of cellulose nanocrystals, we achieve long-range alignment of anisotropic metal nanoparticles in colloidal nanocrystal dispersions that are then used to deposit thin structured films with ordering features highly dependent on the deposition method. These hybrid films are comprised of gold nanorods unidirectionally aligned in a matrix that can be made of or...

Journal: :Nanotechnology 2010
Ellen Blinka Kathryn Loeffler Ye Hu Ashwini Gopal Kazunori Hoshino Kevin Lin Xuewu Liu Mauro Ferrari John X J Zhang

We demonstrate porous silica surface modification, combined with microcontact printing, as an effective method for enhanced protein patterning and adsorption on arbitrary surfaces. Compared to conventional chemical treatments, this approach offers scalability and long-term device stability without requiring complex chemical activation. Two chemical surface treatments using functionalization wit...

Journal: :journal of nanostructures 2012
a. r. badiei g. mohammadi ziarani a. r. abbasi m. jafarabadi

the phenylthiourea-substituted triethoxysilane as a silane agent was synthesized and grafted on highly ordered nanoporous silica (lus-1) with a textured morphology and hexagonal array. this material (tu-lus-1) contained 0.8 mmol/g of soft base phenylthiourea group and surface area 760 m2g-1 and was able to adsorb 0.75 mmolhg/g of tu-lus-1 in endothermic reaction.

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