Metastability of nematic gels made of aqueous chitin nanocrystal dispersions

Biomacromolecules
Maria V TzoumakiCostas G Biliaderis

Abstract

Chitin nanocrystal aqueous dispersions were prepared by acid hydrolysis of crude chitin from crab shells. The resulting dispersions were studied with small deformation oscillatory experiments and polarized optical microscopy under different conditions of nanocrystal concentration, ionic strength, pH, and temperature. The chitin nanocrystal dispersions exhibited a nematic gel-like behavior with increasing solids concentration. The appearance of nematic-like structures could be explained by the Onsager theory for parallel alignment of anisotropic particles on entropic terms, while the sol-gel transition could be attributed to associative interactions between the chitin nanocrystals. With increasing ionic strength and pH, such associative interactions were enhanced, because the repulsive forces due to the electrostatic charges were reduced and, thus, stronger gels were formed. Heating of the nanocrystal dispersions led to further increases in the storage modulus (G'), which were irreversible upon cooling; the rate of G' increase (dG'/dt) was dependent on temperature.

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Citations

Aug 3, 2013·Colloids and Surfaces. B, Biointerfaces·Ibrahim Gülseren, Milena Corredig
Oct 15, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Sandra J VeenKrassimir P Velikov
Sep 3, 2014·Biomacromolecules·Emilie PerrinIsabelle Capron
Sep 28, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Zhiqiang LuoZhigang Wang
Jan 22, 2013·ChemSusChem·Lindy HeathWim Thielemans
Oct 30, 2012·Biomacromolecules·Paramita DasAndreas Walther
Apr 13, 2015·Food Chemistry·Ying ZhangTao Wu
Jul 15, 2015·Soft Matter·Maria V TzoumakiElke Scholten
Feb 11, 2014·Carbohydrate Polymers·Chao Wang, Alan R Esker
Oct 16, 2012·Food & Function·Maria V TzoumakiCostas G Biliaderis
Oct 6, 2016·Carbohydrate Polymers·Carlos F C JoãoJoão P Borges
Dec 13, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Hua-Neng XuXiao-Kun Ouyang
Nov 11, 2015·Scientific Reports·Md Iftekhar Shams, Hiroyuki Yano
Apr 24, 2019·Polymers·Wan-Chen TsaiMin-Lang Tsai
Feb 6, 2021·Carbohydrate Polymers·Sunil Kumar, Jalal Foroozesh
Jan 24, 2021·Carbohydrate Polymers·Shaohua GuYali Ji
Aug 15, 2017·International Journal of Biological Macromolecules·Sheida Hedjazi, Seyed Hadi Razavi
Jun 28, 2019·Biomacromolecules·Aurimas NarkeviciusSilvia Vignolini
Apr 29, 2014·Journal of Agricultural and Food Chemistry·Yang YuanJian Guo
Aug 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Jianxin ZhangHongzan Song

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