A SANS investigation of silk-stabilized aqueous poly(3-hexylthiophene): phenyl-C61-butyric acid methyl ester nanoparticle dispersions

Next Nanotechnology Pub Date : 2024-01-01 DOI:10.1016/j.nxnano.2024.100066

Rajkamal Balu , Tuan Sang Tran , Jitendra P. Mata , Liliana de Campo , Naba K. Dutta , Namita Roy Choudhury

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Abstract

Regenerated silk fibroin (RSF) protein comprising both hydrophilic and hydrophobic chain segments offer great potential for interfacial interaction and stabilization of organic nanoparticles (NPs) in aqueous medium. In this work, aqueous dispersion of poly(3-hexylthiophene):phenyl-C₆₁-butyric acid methyl ester (P3HT:PCBM) NPs of 1:1 weight ratio were prepared using RSF as surfactant for the first time via the mini-emulsion method. The size, morphology, internal structure, interface and hierarchical organization of RSF-stabilized P3HT:PCBM NPs was investigated using UV–visible spectroscopy, contrast-variation small-angle neutron scattering (CV-SANS) and ultra-small-angle neutron scattering (CV-USANS). The P3HT:PCBM NPs were established to be stabilized in the matrix of RSF colloidal microparticles in water. Unlike the commonly used surfactant sodium dodecyl sulfate which produces core–shell (PCBM–P3HT) NPs, the RSF molecules generated P3HT:PCBM NPs with internal structure that resemble phase-separated solvent-cast films. The as-prepared dispersion has good film-forming ability and has been demonstrated for fabrication of composite films comprising graphene oxide.

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丝稳定水性聚（3-己基噻吩）：苯基-C61-丁酸甲酯纳米粒子分散体的 SANS 研究

由亲水和疏水链段组成的再生蚕丝纤维蛋白（RSF）为水介质中有机纳米粒子（NPs）的界面相互作用和稳定提供了巨大的潜力。本研究首次以 RSF 为表面活性剂，通过微型乳液法制备了重量比为 1:1 的聚(3-己基噻吩):苯基-C61-丁酸甲酯（P3HT:PCBM）水分散纳米粒子。利用紫外可见光谱、对比变化小角中子散射（CV-SANS）和超小角中子散射（CV-USANS）对 RSF 稳定的 P3HT:PCBM NPs 的尺寸、形貌、内部结构、界面和分层组织进行了研究。在水中，P3HT:PCBM NPs 被确定稳定在 RSF 胶体微粒的基质中。与常用的表面活性剂十二烷基硫酸钠产生核壳（PCBM-P3HT）NPs 不同，RSF 分子产生的 P3HT:PCBM NPs 内部结构类似于相分离的溶剂铸膜。制备的分散体具有良好的成膜能力，已被证明可用于制造包含氧化石墨烯的复合薄膜。

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Next Nanotechnology

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