Mesoporous guar galactomannan based biocomposite aerogels through enzymatic crosslinking
Mesoporous guar galactomannan based biocomposite aerogels through enzymatic crosslinking
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DOI：
10.1016/j.compositesa.2016.12.013
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发表时间：
2017-03-01
影响因子：
8.7
通讯作者：
Mikkonen, Kirsi S.
中科院分区：
文献类型：
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作者：
Ghafar, Abdul;Gurikov, Pavel;Mikkonen, Kirsi S.
瓜尔半乳甘露聚糖（GM）用可持续的酶氧化方法交联形成水凝胶。纳米纤化纤维素在交联之前用作增强材料。测试了13种溶剂替代凝胶中的水，并讨论了水凝胶的体积产率与溶剂汉森溶解度参数的关系。选择乙醇和二甲基亚砜（DMSO）进行进一步的逐步溶剂交换，以表征水凝胶在每个步骤中对溶剂的响应收缩。与乙醇相比，DMSO与gm基水凝胶在分步溶剂交换过程中表现出较好的相容性，超临界CO2干燥后两者的总体收缩率相近。得到的气凝胶具有高孔隙复合结构，具有较大的表面积（高达333 m(2)/g）和良好的机械刚度。乙醇残留量可忽略不计，这使气凝胶成为食品和其他生命科学应用的安全材料。(C) 2016 Elsevier Ltd.版权所有。
Guar galactomannan (GM) was crosslinked using a sustainable enzymatic oxidation approach to form hydrogels. Nanofibrillated cellulose was used as reinforcement prior to crosslinking. Thirteen solvents were tested for replacing water in the gels, and the volumetric yields of hydrogels are discussed in relation to the solvents' Hansen solubility parameters. Ethanol and dimethyl sulfoxide (DMSO) were selected for further stepwise solvent exchange, to characterize the hydrogels' shrinkage in response to solvents at each step. DMSO displayed a good compatibility with GM-based hydrogels as compared to ethanol during stepwise solvent exchange, and the overall shrinkage value was similar with those two solvents after supercritical CO2 drying. The obtained aerogel exhibited highly porous composite structures with a large surface area (up to 333 m(2)/g) and good mechanical stiffness. Negligible ethanol residue was detected, which makes the aerogels safe materials for food and other life science applications. (C) 2016 Elsevier Ltd. All rights reserved.