Synthesis and Characterization of Compostite Functionalized Mesoporous Materials Based on Silica as Separation Medium and Application in Electroplanting Additive Analysis

2011 ◽  
Vol 239-242 ◽  
pp. 1775-1780
Author(s):  
Hong Tao Chu ◽  
Ying Wang ◽  
Jin Qiu Zhang ◽  
Mao Zhong An
Keyword(s):  
Monolithic Column ◽  
Tetraethyl Orthosilicate ◽  
Ammonium Bromide ◽  
Reaction Conditions ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Hybrid Silica ◽  
Infrared Spectrometer ◽  
Cetyltrimethyl Ammonium ◽  
Separation Medium

The functionalized porous hybrid silica as a separation medium was synthesized by using Cetyltrimethyl Ammonium Bromide(CTAB) as template, (3-aminopropyl) triethoxysilane (APTES) and tetraethyl orthosilicate (TEOS) as reactive monomer, with the existence of ammonia, reacting for 80 h at 80°C. The influences of the main reactants ratio and the pH of reaction on the structure of the materials were investigated through the characterization by Fourier-Transform infrared spectrometer (FTIR), scanning electron microscope (SEM) and pore structure measurements. And the best reaction conditions were optimized. The monolithic column made by this porous hybrid silica has been applied to separate benzylideneacetone and o-chlorotoluene, which are the main composition in electroplating additive.

Preparation and Investigation of Hydrophobic Mesoporous Silica Films

2010 ◽  
Vol 152-153 ◽  
pp. 856-859 ◽  
Author(s):  
Yu Juan Cao ◽  
Zhao Feng Wu
Keyword(s):  
Dip Coating ◽  
Tetraethyl Orthosilicate ◽  
Low Dielectric Constant ◽  
Ammonium Bromide ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Silica Films ◽  
Low Dielectric ◽  
Mesoporous Sio2 ◽  
Cetyltrimethyl Ammonium ◽  
Intermetal Dielectric

A novel route to prepare hydrophobic mesoporous SiO2 films is reported in this paper. A two step process involving tetraethyl orthosilicate (TEOS) as a precursor and cetyltrimethyl ammonium bromide (CTAB) as a template prepared SiO2 sol catalyzed by hydrochloric acid. The films are prepared by dip-coating process. It has been found that the films have low dielectric constant and good mechanical properties. Preliminary results present a very positive prospective for intermetal dielectric applications.

Scheelite (CaWO4)-type microphosphors: Facile synthesis, structural characterization and photoluminescence properties

2016 ◽  
Vol 30 (32n33) ◽  
pp. 1650400 ◽  
Author(s):  
Yuanyuan Han ◽  
Dan Wang ◽  
Danyang Liang ◽  
Shiqi Wang ◽  
Guoxin Lu ◽  
...  
Keyword(s):  
Luminescence Decay ◽  
Precipitation Method ◽  
Ammonium Bromide ◽  
Photoluminescence Properties ◽  
Facile Synthesis ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Broad Emission ◽  
Transition Formula ◽  
Cetyltrimethyl Ammonium ◽  
Uv Excitation

Scheelite (CaWO4)-type microphosphors were synthesized by the precipitation method assisted with cetyltrimethyl ammonium bromide (CTAB). All compounds crystallized in the tetragonal structure with space group [Formula: see text] (No. 88). FE-SEM micrographs illustrate the spherical-like morphologies and rough surface. PL spectra indicate the broad emission peak maximum at 613 nm under UV excitation. Luminescence decay curves monitored by [Formula: see text] transition ([Formula: see text] nm) of Eu[Formula: see text] in doped CaWO4 are presented, the curves exhibit a single-exponential feature and the lifetime for doped CaWO4 is 0.61 ms.

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