Next Article in Journal
Adverse Drug Reaction Predictions Using Stacking Deep Heterogeneous Information Network Embedding Approach
Previous Article in Journal
Quantification of Total Phenolic and Carotenoid Content in Blackberries (Rubus Fructicosus L.) Using Near Infrared Spectroscopy (NIRS) and Multivariate Analysis
Article Menu

Export Article

Open AccessArticle
Molecules 2018, 23(12), 3192; https://doi.org/10.3390/molecules23123192

Silica Aerogel Monoliths Derived from Silica Hydrosol with Various Surfactants

School of Physics Science and Engineering & Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Tongji University, Shanghai 200092, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Carlos A. García-González
Received: 22 October 2018 / Revised: 30 November 2018 / Accepted: 30 November 2018 / Published: 4 December 2018
(This article belongs to the Special Issue Engineering of Aerogels and Their Applications)
Full-Text   |   PDF [4529 KB, uploaded 4 December 2018]   |  

Abstract

Owing to their ultra-low thermal conductivity, silica aerogels are promising thermal insulators; however, their extensive application is limited by their high production cost. Thus, scientists have started to explore low-cost and easy preparation processes of silica aerogels. In this work, a low-cost method was proposed to prepare silica aerogels with industrial silica hydrosol and a subsequent ambient pressure drying (APD) process. Various surfactants (cationic, amphoteric, or anionic) were added to avoid solvent exchange and surface modification during the APD process. The effects of various surfactants on the microstructure, thermal conductivity, and thermal stability of the silica aerogels were studied. The results showed that the silica aerogels prepared with a cationic or anionic surfactant have better thermal stability than that prepared with an amphoteric surfactant. After being heated at 600 °C, the silica aerogel prepared with a cationic surfactant showed the highest specific surface area of 131 m2∙g−1 and the lowest thermal conductivity of 0.038 W∙m−1∙K−1. The obtained low-cost silica aerogel with low thermal conductivity could be widely applied as a thermal insulator for building and industrial energy-saving applications. View Full-Text
Keywords: silica hydrosol; aerogel; ambient pressure drying; surfactant silica hydrosol; aerogel; ambient pressure drying; surfactant
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Chen, D.; Wang, X.; Ding, W.; Zou, W.; Zhu, Q.; Shen, J. Silica Aerogel Monoliths Derived from Silica Hydrosol with Various Surfactants. Molecules 2018, 23, 3192.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top