利用超声技术非超临界干燥合成疏水、低密度、高表面积二氧化硅气凝胶

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
J. Sharma, Shivangi Shukla, Javed Sheikh, B. Behera
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引用次数: 0

摘要

摘要在硅胶气凝胶生产中,用空气代替溶剂是获得理想物理性能的关键。尽管在环境压力下通过蒸发干燥被认为是最简单的方法,但它会收缩并使凝胶网络崩溃。本研究采用室温超声法制备均匀溶胶。经溶剂交换,用三甲基氯硅烷(TMCS)对湿凝胶进行表面改性。制备的气凝胶通过各种表征技术来评估其功能、结构、形态、表面和热性能。考察了制备的二氧化硅气凝胶的结构和物理特性与前驱体浓度、影响二氧化硅气凝胶密度的催化剂、体积收缩率和凝胶化时间的关系。二氧化硅气凝胶的热稳定性可达800°C,疏水性可达350°C。所制备的气凝胶的接触角证实了其疏水性。场发射扫描电镜(FE-SEM)和x射线衍射(XRD)结果证实了二氧化硅气凝胶的多孔性。brunauer - emmet - teller (BET)表面积分析结果表明,其表面积为784 m2/g,孔隙半径为36 Å。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Non-supercritical drying synthesis of hydrophobic, low-density, and high surface area silica aerogel using a sonication technique
Abstract Replacing the solvent in silica aerogel production with air is critical in getting the desired physical properties. Even though drying by evaporation under ambient pressure is thought to be the simplest way, it shrinks and collapses the gel network. In this research, uniform sol was prepared by sonication at room temperature. The surface of the developed wet gel was modified with trimethylchlorosilane (TMCS) after solvent exchange. The prepared aerogels underwent various characterization techniques to evaluate their functional, structural, morphological, surface, and thermal properties. The textural and physical characteristics of prepared silica aerogel were examined in relation to the precursor concentration, catalysts that affect the density of silica aerogel, volumetric shrinkage, and gelation time. The silica aerogel was found thermally stable up to 800 °C while hydrophobicity retained up to 350 °C. The contact angle of prepared aerogels confirms their hydrophobic nature. Field emission scanning electron microscopy (FE-SEM) and X-Ray Diffraction (XRD) results demonstrate the porous nature of silica aerogel. The Brunauer-Emmett-Teller (BET) surface area analysis revealed that the surface area and the pore radius were 784 m2/g and 36 Å, respectively.
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来源期刊
Drying Technology
Drying Technology 工程技术-工程:化工
CiteScore
7.40
自引率
15.20%
发文量
133
审稿时长
2 months
期刊介绍: Drying Technology explores the science and technology, and the engineering aspects of drying, dewatering, and related topics. Articles in this multi-disciplinary journal cover the following themes: -Fundamental and applied aspects of dryers in diverse industrial sectors- Mathematical modeling of drying and dryers- Computer modeling of transport processes in multi-phase systems- Material science aspects of drying- Transport phenomena in porous media- Design, scale-up, control and off-design analysis of dryers- Energy, environmental, safety and techno-economic aspects- Quality parameters in drying operations- Pre- and post-drying operations- Novel drying technologies. This peer-reviewed journal provides an archival reference for scientists, engineers, and technologists in all industrial sectors and academia concerned with any aspect of thermal or nonthermal dehydration and allied operations.
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