Hierarchically porous composites fabricated by hydrogel templating and viscous trapping techniques

Thompson Benjamin R.; Horozov, Tommy S.; Stoyanov, Simeon D.; Paunov, Vesselin N.

School of Mathematics and Physical Sciences; School of Mathematics and Physical Sciences; School of Mathematics and Physical Sciences
Hydrogels; Porous materials; Methylcellulose; Agar; Hydrogel templating; Viscous trapping; Thermal conductivity; Compressional strength; Hierarchical porosity
2018

Journal article


Abstract

Two methods for the preparation of hierarchically porous composites have been developed and explored. The first involved templating mixed slurries of hydrogel beads with two different average bead size distributions with gypsum slurry which allows for precise control over the porosity, pore size distributions and hierarchical microstructure of the hardened composite after the evaporation of the water from the hydrogel beads. The other technique utilised the viscosity of methylcellulose solution to suspend gypsum particles as they form an interlocked network. By varying the volume percentage ofmethylcellulose solution used, it is possible to control the porosity of the dried sample. The mechanical and thermal insulation properties of the composites as a function of both their porosity and pore size were investigated. Bothmethods demonstrate an inexpensive approach for introducing porosity in gypsumcomposites which reduces their thermal conductivity, improves their insulation properties and allows economic use of the matrix material whilst controlling their mechanical properties. Such composites allow for tuneable porosity without significantly compromising their strength which could find applications in the building industry as well as structuring of other composites for a variety of consumer products.

Publisher
The University of Hull
Peer reviewed
Yes
Language
English
Identifier
hull:15692

Journal

Journal title
Materials and design
Publication date
2018
Publisher
Elsevier
DOI
10.1016/j.matdes.2017.10.046
ISSN (Print)
0261-3069
ISSN (Electronic)
0264-1275
Volume
137
Start page
384
End page
393
Restriction
Full text not available in this repository until: October 2018
Notes

This is a description of an article which has been published in: Materials and design, 2018, v.137

Link
Published article
QR Code