通过使用离子型表面活性剂提高多壁碳纳米管在淀粉基薄膜中的分散性。
Enhancing the dispersibility of multiwalled carbon nanotubes within starch-based films by the use of ionic surfactants.
机构信息
Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal; Department of Materials and Ceramic Engineering, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
CIQUP, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, P 4169-007 Porto, Portugal.
出版信息
Carbohydr Polym. 2021 Dec 1;273:118531. doi: 10.1016/j.carbpol.2021.118531. Epub 2021 Aug 5.
The incorporation of carbon-based nanomaterials into biopolymer matrix, to provide mechanical reinforcement and to obtain electrically conductive bionanocomposites, requires the homogeneous dispersion of the fillers. Herein, it is investigated the influence of surfactant structures on the dispersibility of multiwalled carbon nanotubes (MWNT) within starch matrix. Three different ionic surfactants, sodium dodecyl sulphate (SDS), cetyltrimethylammonium bromide (CTAB) and sodium cholate (SC), are employed to disperse the MWNT. Films with MWNT-SC show better dispersibility and an increase of about 75% of tensile strength and 60% of Young's modulus compared with films using MWNT-SDS and MWNT-CTAB. Nevertheless, MWNT functionalized with CTAB impart the highest values of antioxidant activity (scavenging activity around 30% in 1.5 h) and electrical conductivity (σ =14.75 S/m) to starch matrix. The properties of starch-based films can be tailored according to the physical adsorption of each surfactant on MWNT surface and/or the interfacial interaction of the surfactant with starch chains.
将碳基纳米材料纳入生物聚合物基体中，以提供机械增强并获得导电的生物纳米复合材料，需要填充剂的均匀分散。本文研究了表面活性剂结构对多壁碳纳米管（MWNT）在淀粉基体中分散性的影响。三种不同的离子表面活性剂，十二烷基硫酸钠（SDS）、十六烷基三甲基溴化铵（CTAB）和胆酸钠（SC），用于分散 MWNT。与使用 MWNT-SDS 和 MWNT-CTAB 的薄膜相比，MWNT-SC 薄膜具有更好的分散性，拉伸强度提高约 75%，杨氏模量提高 60%。然而，用 CTAB 功能化的 MWNT 赋予淀粉基体最高的抗氧化活性（在 1.5 小时内清除活性约 30%）和电导率（σ=14.75 S/m）。可以根据每种表面活性剂在 MWNT 表面上的物理吸附和/或表面活性剂与淀粉链的界面相互作用来调整淀粉基薄膜的性能。
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