TY - JOUR
T1 - Effect of unidirectional freezing using a thermal camera on polyvinyl (alcohol) for aligned porous cryogels
AU - de Lima, Gabriel Goetten
AU - Barbosa, Rêydila Rayenne Caminhas
AU - de Andrade Santos, Mayara Pazin
AU - Chee, Bor Shin
AU - Esteves Magalhães, Washington Luiz
AU - Devine, Declan M.
AU - Nugent, Michael J.D.
N1 - Publisher Copyright:
© 2020 Informa UK Limited, trading as Taylor & Francis Group.
PY - 2021
Y1 - 2021
N2 - Unidirectional freeze casting for polymers and ceramics has been performed extensively; however, the mechanisms involved in unidirectional freezing are not thoroughly understood and therefore, in this study, polyvinyl (alcohol) hydrogels were freeze-thawed by unidirectional freezing and the resultant freezing profile was investigated using thermal imagery to comprehend the physical mechanism involved in the production of these aligned cryogels. The approach used follows a slight variation from what is currently used in literature, by enclosing the mould with insulating materials and leaving one side with a metal encasing for a fast freezing flow from the direction of the desired aligned of the structure. This method was cost-effective and simple; however, it was able to induce unidirectional freezing resulting in two distinct structures. These structures exhibited a cellular region interspersed with a fibrous and porous morphology. The method developed without the need of a freeze-dryer was confirmed to produce a unidirectional freezing which can be used for future studies.
AB - Unidirectional freeze casting for polymers and ceramics has been performed extensively; however, the mechanisms involved in unidirectional freezing are not thoroughly understood and therefore, in this study, polyvinyl (alcohol) hydrogels were freeze-thawed by unidirectional freezing and the resultant freezing profile was investigated using thermal imagery to comprehend the physical mechanism involved in the production of these aligned cryogels. The approach used follows a slight variation from what is currently used in literature, by enclosing the mould with insulating materials and leaving one side with a metal encasing for a fast freezing flow from the direction of the desired aligned of the structure. This method was cost-effective and simple; however, it was able to induce unidirectional freezing resulting in two distinct structures. These structures exhibited a cellular region interspersed with a fibrous and porous morphology. The method developed without the need of a freeze-dryer was confirmed to produce a unidirectional freezing which can be used for future studies.
KW - Unidirectional-freezing
KW - freeze casting
KW - polyvinyl (alcohol) cryogels
UR - http://www.scopus.com/inward/record.url?scp=85082133160&partnerID=8YFLogxK
U2 - 10.1080/17686733.2020.1732735
DO - 10.1080/17686733.2020.1732735
M3 - Article
AN - SCOPUS:85082133160
SN - 1768-6733
VL - 18
SP - 177
EP - 186
JO - Quantitative InfraRed Thermography Journal
JF - Quantitative InfraRed Thermography Journal
IS - 3
ER -