نتایج جستجو برای: silane grafting

تعداد نتایج: 32245  

Journal: :Colloids and Surfaces A: Physicochemical and Engineering Aspects 2023

In the context of rare earth element extraction using solid-liquid process, hybrid materials having specific functional group were largely studied. However, there is a lack in situ characterization method to understand how behaves when interacts with element. Here, we propose new experimental interaction between immobilized and REE aqueous media well-characterized model system coupled surface a...

A. Ahmadzadeh, A. Kavyani, F. Golmohammadi, N. Panahandeh, Z. Ghasemi,

Objectives: Ceramics have advantages such as optimal esthetics and biocompatibility. However, in the oral environment, they are subjected to high levels of stress due to masticatory forces, saliva, thermal changes and alterations of pH, which increase their risk of fracture. Since replacement of these restorations is costly and time-consuming, composite resin is often used for intraoral repair ...

2009
A. Feltrin C. Ballif A. A. Howling Ch. Hollenstein

In this work the microstructure transition width from amorphous to microcrystalline silicon is discussed. It is shown that the width of the transition depends on the input silane concentration level and indirectly on the silane depletion level. The higher the input silane concentration and depletion, the wider the transition. Experimental results are then compared to an analytical model and goo...

2009
Olga Degtyareva John E. Proctor Christophe Guillaume Michael Hanfland

Silane (SiH4) is found to (partially) decompose at pressures above 50 GPa at room temperature into pure Si and H2. The released hydrogen reacts with surrounding metals in the diamond anvil cell to form metal hydrides. A formation of rhenium hydride is observed after the decomposition of silane. From the data of a previous experimental report (Eremets et al., Science 319, 1506 (2008)), the claim...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
Ulrich Jonas Aránzazu del Campo Christian Krüger Gunnar Glasser Diana Boos

The site-selective assembly of colloidal polymer particles onto laterally patterned silane layers was studied as a model system for the object assembly process at mesoscale dimensions. The structured silane monolayers on silicon oxide substrates were fabricated by a combination of liquid- and gas-phase deposition of different trialkoxysilanes with a photolithographic patterning technique. By us...

1999
Yunsheng Xu

The tensile strength of cement paste was increased by 56% and the modulus and ductility were increased by 39% by using silane-treated carbon fibers and silane-treated silica fume, relative to the values for cement paste with as-received carbon fibers and as-received silica fume. Silane treatment of fibers and silica fume contributed about equally to the strengthening. Silane treatment of fibers...

Journal: :Dental materials : official publication of the Academy of Dental Materials 2006
Jorge Perdigão George Gomes Ignatius K Lee

OBJECTIVES Esthetic posts have been developed to maximize the foundation of esthetic restorations. The purpose of this study was to evaluate the effect of silane on the bond strength of three fiber-reinforced resin posts (fiber posts). METHODS Fifty-four extracted human maxillary central incisors and canines were endodontically treated. D.T. Light Post (DT, Bisco), FRC Postec (FR, Ivoclar Viv...

2016
Shihan Xu Xinran Zhang Hongwei Xu Biao Dong Xuesong Qu Boting Chen Shuang Zhang Tianxiang Zhang Yu Cheng Sai Xu Hongwei Song

Herein, we report a facile route to synthesize silane coated upconversion nanoparticles (UCNPs@silane) with an ultrathin layer (the thickness: 1-2 nm), which not only provides good biocompatibility, but also affords hydrophobic interspace to load organic molecules to realize multifunctions. Besides the function of upconversion imaging of UCNPs, cancer therapy and oxygen level detection can also...

Journal: :Carbohydrate polymers 2012
Meng-Hsuan Hsiao Tsan-Hua Tung Chi-Sheng Hsiao Dean-Mo Liu

Silane-modified amphiphilic chitosan was synthesized by anchoring a silane coupling agent, (3-aminopropyl)triethoxysilane, to a novel amphiphilic carboxymethyl-hexanoyl chitosan (CHC). The chemical structure of this new organic-inorganic hybrid molecule was characterized by FTIR and 13C-, 29Si-nuclear magnetic resonance, while the structural evolution was examined using scanning electron micros...

2008
M. Cavarroc

Silane-based plasmas are widely used to deposit nanostructured silicon thin films or to synthesize silicon nanoparticles. Dust particle formation in Ar/SiH4 plasmas is a continuous phenomenon: as long as silane precursors are provided, new dust generations are formed. Successive generations can be monitored thanks to various electrical (Vdc/3H) and optical (OES, video imaging) diagnostics. Expe...

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