Preparation of Raspberry-Like Polymer/Silica Composite Particles through Cationic Soap-Free Emulsion Polymerization

2012 ◽  
Vol 476-478 ◽  
pp. 1408-1411
Author(s):  
Xin Fan ◽  
Qiu Ju Qin ◽  
Xiu Fang Wen ◽  
Jiang Cheng ◽  
Zhuo Ru Yang
Keyword(s):  
Emulsion Polymerization ◽  
Silica Content ◽  
Silica Particles ◽  
Vital Role ◽  
Silica Sol ◽  
Electrostatic Attraction ◽  
Composite Particles ◽  
Silica Composite ◽  
Soap Free Emulsion Polymerization

In this paper raspberry-like composite particles were prepared via cationic soap-free emulsion polymerization with silica sol as stabilizer and 2-(methacryloyl) ethyltrimethylammonium chloride (MTC) as cationic auxiliary monomer. According to the TGA and TEM results we could find that the electrostatic attraction supplied by MTC played a vital role in the adsorption of silica particles as well as the generation of raspberry-like morphology. The silica content and appearance of composite particles were found to be improved with the increasing amount of silica sol and MTC while varied little with changes of AIBA amount.

scholarly journals Performance characterization and application of composite adsorbent LiCl@ACFF for moisture harvesting

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
X. Y. Liu ◽  
W. W. Wang ◽  
S. T. Xie ◽  
Q. W. Pan
Keyword(s):  
Water Uptake ◽  
Vital Role ◽  
Silica Sol ◽  
Activated Carbon Fiber ◽  
Low Grade ◽  
Human Society ◽  
Water Harvesting ◽  
Energy Estimation ◽  
Carbon Fiber Felt ◽  
Global Threat

AbstractFreshwater scarcity is a global threat to modern era of human society. Sorption-based atmospheric water harvesting (AWH) is prospective to provide fresh water for remote water-stressed areas lacking in water and electricity. Adsorbent material plays a vital role in such AWH systems. Here, we report a solid adsorbent synthesized by impregnating hygroscopic salt lithium chloride (LiCl) into solidified activated carbon fiber felt (ACFF modified by silica sol). Composite samples immersed with different mass concentrations of silica sol are prepared and characterized for dynamic water uptake, equilibrium water uptake, textural and thermal properties. AS5Li30 (ACFF + 5 wt% silica gel + 30 wt% LiCl) exhibits an efficient water uptake of 2.1 g/g at 25 °C and 70% relative humidity (RH). The material further demonstrates a heat storage capacity of 5456 kJ/kg. Its low regeneration temperature (< 80 °C) and good cycle stability make it feasible to be used in practical water production applications, driven by solar energy and other low-grade energy. Estimation results show that water harvesting unit can produce 1.41 gH2O/gAS5Li30 under 25 °C and 75% RH.

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