Silica for Tire Industry
        Silica for Feed additive
        Silica for Rubber Industry
        Silica for Silicon Rubber
        Airspay silicon dioxide
        Medicinal Silica
        Toothpaste with silica
        Silica for Food additive
        Sodium Silicate
         More
 
 
  News Center

 

Using ab initio modeling we demonstrate that H atoms can break strained Si─O bonds in continuous amorphous silicon dioxide (a?SiO2) networks, resulting in a new defect consisting of a threefold-coordinated Si atom with an unpaired electron facing a hydroxyl group, adding to the density of dangling bond defects, such as E′ centers. The energy barriers to form this defect from interstitial H atoms range between 0.5 and 1.3 eV. This discovery of unexpected reactivity of atomic hydrogen may have significant implications for our understanding of processes in silica glass and nanoscaled silica, e.g., in porous low-permittivity insulators, and strained variants of a?SiO2.

By transmission electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy and other means of detection, combined with model calculations to study the silane coupling agent (silane coupling agent) and mechanism of ultrafine Silicon Dioxide surface-modified graft polymers. silane coupling agent KH570 and KH858 think are effective pretreatment agent, the type of silane coupling agent modified greatly. Since KH570 double bond to a carbonyl group contained in the formation of a delocalized Π44 key to double bond weakened; and in KH858 due to the silicon atom electron donating effect to the double bond binding force has been strengthened; pretreated using KH570 polymer containing ultrafine silica surface more, better dispersion .KH570 more suitable for ultra-fine silica surface-modified graft polymerization treatment agent.

The materials Silicon Dioxide, silicon nitride, aluminum oxide, aluminum nitride, and titanium oxide are prepared using room temperature reactive sputter deposition and are characterized using MIR variable angle spectroscopic ellipsometry. The investigation shows how sensitive the refractive index functions are to the O2 and N2 flow rates, and for which growth conditions the materials deposit homogeneously. It also allows conclusions to be drawn on the degree of amorphousness and roughness. To facilitate comparison of the materials deposited in this work with others, the index of refraction was also determined and provided for the near-IR and visible ranges of the spectrum. The results presented here should serve as a useful information base for designing optical coatings for the MIR part of the electromagnetic spectrum. The results are parameterized to allow them to be easily used for coating design.


 

 

Copyright(C)2016 , Xinxiang Yellow River Fine Chemical Industry Co., Ltd. All Rights Reserved.  Supported by  LookChem Copyright Notice