Morphology and ionic conductivity relationship in silk/cellulose biocomposites
Morphology and ionic conductivity relationship in silk/cellulose biocomposites
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DOI：
10.1002/pi.5860
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发表时间：
2019-09-01
影响因子：
3.2
通讯作者：
Salas-de la Cruz, David
中科院分区：
文献类型：
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作者：
Blessing, Bailey;Trout, Cory;Salas-de la Cruz, David
本研究探讨了多糖-蛋白质生物电解质膜的形态与离子电导率的关系。结构蛋白和多糖形成疏水和静电相互作用，所得到的基质可以显示出新的和有用的性质。然而，将这些天然生物大分子从它们的天然状态转变为更有用的形式是具有挑战性的。采用傅立叶变换红外光谱、扫描电子显微镜、热重分析、差示扫描量热仪、X射线散射、原子力显微镜纳米压痕和介电弛豫谱等技术，研究了微晶纤维素和家蚕丝生物材料在离子液体和不同凝固剂作用下的结构、形态、热、力学和电学性能。不同的凝固剂和离子液体使薄膜的表面形貌发生了变化。研究发现，其热性能和力学性能取决于凝聚过程中使用的离子液体类型所决定的分子间相互作用。X-射线散射提供了纤维结晶度随凝固剂变化的信息。具体地说，过氧化氢凝固的样品显示出纤维素结晶度的增加，影响了生物复合材料的弹性、硬度和离子导电性等性能。此外，研究结果还表明，β-折叠含量与离子电导率和纤维素结晶度之间存在很强的相关性。结果表明，离子电导率依赖于蛋白质的β-折叠含量和纤维素的结晶度。(三)2019年化学工业学会
The relationship between morphology and the ionic conductivity of polysaccharide-protein bio-electrolyte membranes is explored in this study. Structural proteins and polysaccharides form hydrophobic and electrostatic interactions, and the resulting matrices can exhibit novel and useful properties. However, transforming these natural biomacromolecules from their native state to a more usable form is challenging. The structural, morphological, thermal, mechanical and electrical properties of biomaterials composed of microcrystalline cellulose and Bombyx mori silk when regenerated together using ionic liquids and various coagulation agents were investigated using a diverse set of techniques including Fourier transform infrared spectroscopy, SEM, TGA, DSC, X-ray scattering, AFM-based nanoindentation and dielectric relaxation spectroscopy. The surface topography of the films reveals morphological changes with varying coagulation agents and ionic liquids. It was found that the thermal and mechanical properties were dependent on intermolecular interactions dictated by the type of ionic liquid used during the coagulation process. X-ray scattering provided information on how the cellulose crystallinity varied with coagulation agent. Specifically, samples coagulated with hydrogen peroxide showed an increase in cellulose crystallinity impacting properties such as elasticity, hardness and ionic conductivity of the biocomposites. In addition, the results revealed a strong correlation between beta-sheet content and ionic conductivity and cellulose crystallinity. The results provided evidence that the ionic conductivity is dependent on protein beta-sheet content and cellulose crystallinity. (c) 2019 Society of Chemical Industry