نتایج جستجو برای: synthesis of materials

تعداد نتایج: 21214915  

Journal: :The Review of scientific instruments 2015
Santosh K Suram Lan Zhou Natalie Becerra-Stasiewicz Kevin Kan Ryan J R Jones Brian M Kendrick John M Gregoire

Many next-generation technologies are limited by material performance, leading to increased interest in the discovery of advanced materials using combinatorial synthesis, characterization, and screening. Several combinatorial synthesis techniques, such as solution based methods, advanced manufacturing, and physical vapor deposition, are currently being employed for various applications. In part...

Journal: :Dalton transactions 2011
Kristin Bergum Hiroshi Okamoto Helmer Fjellvåg Tor Grande Mari-Ann Einarsrud Sverre M Selbach

Nanocrystalline YMnO(3) has been prepared by wet chemical synthesis routes to obtain crystallites with sizes from 20 nm to bulk material. The crystal structure of hexagonal YMnO(3) nanocrystallites smaller than 80 nm deviates from bulk material in terms of unit cell distortion and unit cell volume. The ferrielectric displacements of Y(3+) cations along the polar c-axis decays progressively with...

Journal: :Chemical communications 2004
Jas Pal Badyal Audrey M Cameron Neil R Cameron Diane M Coe Richard Cox Benjamin G Davis Leslie J Oates Gisle Oye Christos Spanos Patrick G Steel

Plasmachemical surface modification of porous polystyrene beads with allylamine or diaminopropane provides reactive amine functionality exclusively at accessible surface sites, allowing faster reactions than classically prepared materials.

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2006
Oren A Scherman G B W L Ligthart Haruki Ohkawa Rint P Sijbesma E W Meijer

We show that combining concepts generally used in covalent organic synthesis such as retrosynthetic analysis and the use of protecting groups, and applying them to the self-assembly of polymeric building blocks in multiple steps, results in a powerful strategy for the self-assembly of dynamic materials with a high level of architectural control. We present a highly efficient synthesis of bifunc...

Journal: :Physical chemistry chemical physics : PCCP 2010
Armel Le Bail

Databases dedicated to predicted inorganic crystal structures are emerging fast. Possible applications are listed, from identification through the powder diffraction pattern fingerprint, leading to crystal structure determination before estimation of the cell parameters of newly synthesized real compounds, to the prediction of interesting properties of still unknown materials, allowing chemical...

Journal: :Journal of the American Chemical Society 2015
Feng Hu Mehulkumar Patel Feixiang Luo Carol Flach Richard Mendelsohn Eric Garfunkel Huixin He Michal Szostak

Transition-metal-catalyzed alkylation reactions of arenes have become a central transformation in organic synthesis. Herein, we report the first general strategy for alkylation of arenes with styrenes and alcohols catalyzed by carbon-based materials, exploiting the unique property of graphenes to produce valuable diarylalkane products in high yields and excellent regioselectivity. The protocol ...

2005
Yves Chauvin Robert H. Grubbs

Three researchers share this year ́s Nobel Prize in Chemistry: Dr. Yves Chauvin at the Institut Français du Pétrole, Rueil-Malmaison, France; Professor Robert H. Grubbs, California Institute of Technology, Pasadena, California, USA and Professor Richard R. Schrock, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA. The Royal Swedish Academy of Sciences citation runs “for the d...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده شیمی 1391

in this project, 4,4?-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) as a diacid, was prepared by the reaction of trimellitic anhydride (tma) with 4,4?-methylenebis(3-chloro-2,6-diethylaniline) (mcdea). the novel poly(amide-imide) (pai) was synthesized from the reaction of 4,4?-methylenebis(3-chloro-2,6-diethyl trimellitimidobenzene) as a diacid with mcdea under green condition using ...

Journal: :Nano letters 2014
Qiao Zhang Xing-Zhong Shu J Matthew Lucas F Dean Toste Gabor A Somorjai A Paul Alivisatos

An "inorganic micelle" structure that has a hydrophilic cavity and hydrophobic surface has been synthesized. The inorganic micelles possess large surface area and controllable hydrophobic/hydrophilic interface. It shows high catalytic efficiency and great recyclability in the bromination of alcohols. This work suggests that inorganic micelles may be suitable for selective organic syntheses as w...

2017
Junxiu Ma Juan Qi Xinyu Gao Chunhua Yan Tianlong Zhang Hongsheng Tang Hua Li

3,5-Diamino-1,2,4-triazole (DAT) became a significant energetic materials intermediate, and the study of its reaction mechanism has fundamental significance in chemistry. The aim of this study is to investigate the ability of online attenuated total reflection infrared (ATR-IR) spectroscopy combined with the novel approach of hybrid hard- and soft-modelling multivariate curve resolution-alterna...

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