a.College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610068, China
b.State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
lijuan_zhao@sicnu.edu.cn
收稿:2021-11-09,
修回:2022-1-18,
录用:2022-2-3,
网络首发:2022-05-27,
纸质出版:2022-07-01
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Xi, X. T.; Luo, X. Q.; Xia, Y.; Yi, L. F.; Wang, Y.; Song, D. Y.; Song, Y. J.; Wu, J. R.; Zhao, L. J. Ice crystal growth mechanism and structure-activity relationships of graphene oxide/poly(vinyl alcohol) aerogels. Chinese J. Polym. Sci. 2022, 40, 772–780
Xiao-Tian Xi, Xing-Qi Luo, Yu Xia, et al. Ice Crystal Growth Mechanism and Structure-activity Relationships of Graphene Oxide/Poly(vinyl alcohol) Aerogels[J]. Chinese Journal of Polymer Science, 2022, 40(7): 772-780.
Xi, X. T.; Luo, X. Q.; Xia, Y.; Yi, L. F.; Wang, Y.; Song, D. Y.; Song, Y. J.; Wu, J. R.; Zhao, L. J. Ice crystal growth mechanism and structure-activity relationships of graphene oxide/poly(vinyl alcohol) aerogels. Chinese J. Polym. Sci. 2022, 40, 772–780 DOI: 10.1007/s10118-022-2707-3.
Xiao-Tian Xi, Xing-Qi Luo, Yu Xia, et al. Ice Crystal Growth Mechanism and Structure-activity Relationships of Graphene Oxide/Poly(vinyl alcohol) Aerogels[J]. Chinese Journal of Polymer Science, 2022, 40(7): 772-780. DOI: 10.1007/s10118-022-2707-3.
By employing graphene oxide (GO) as the aerogel skeleton and utilizing polyvinyl alcohol (PVA) to regulate the ice crystal growth
we elucidate the relationships between the physicochemical properties of GO/PVA aerogel precursors
the nucleation and growth of ice crystals
and aerogel structure by using an ice-templating method.
Aerogels are special porous materials with low thermal conductivity
light weight
high energy absorption rate and large surface area
which have been applied in many fields. However
controlling the aerogel microstructure remains an academic challenge. Herein
by employing graphene oxide (GO) as the aerogel skeleton and utilizing poly(vinyl alcohol) (PVA) to regulate the ice crystal growth
we elucidate the relationships between the physicochemical properties of GO/PVA aerogel precursors and the nucleation and growth of ice crystals by using an ice-templating method. We demonstrate that due to the hydrogen bond formed between PVA and water molecules
resulting in the initial crystallization temperature being reduced from −12.60 °C (GO/PVA-0.01) to −16.21 °C (GO/PVA-0.1). Meanwhile
the strong hydrogen bond between PVA and GO limits the diffusion of water molecules
thereby inhibiting the growth of ice crystals
decreasing the pore size of the GO/PVA aerogel from 9.96 nm (GO/PVA-0.01) to 7.19 nm (GO/PVA-0.3)
and thus the compressive strength of the aerogel increases from 0.045 MPa to 0.13 MPa. Overall
the finding of this study can be extended to other aerogel precursors
and exhibit important scientific value and practical significance for the preparation of aerogel materials with highly controllable structures and performances.
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