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Charge-driven interfacial gelation of cellulose nanofibrils across the water/oil interface.
Soft Matter ( IF 2.9 ) Pub Date : 2019-11-07 , DOI: 10.1039/c9sm01551e Vincenzo Calabrese 1 , Marcelo A da Silva , Julien Schmitt , Kazi M Zakir Hossain , Janet L Scott , Karen J Edler
Soft Matter ( IF 2.9 ) Pub Date : 2019-11-07 , DOI: 10.1039/c9sm01551e Vincenzo Calabrese 1 , Marcelo A da Silva , Julien Schmitt , Kazi M Zakir Hossain , Janet L Scott , Karen J Edler
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Interfacial gels, obtained by the interaction of water-dispersible oxidised cellulose nanofibrils (OCNF) and oil-soluble oleylamine (OA), were produced across water/oil (W/O) interfaces. Surface rheology experiments showed that the complexation relies on the charge coupling between the negatively-charged OCNF and OA. Complexation across the W/O interface was found to be dependent on the ζ-potential of the OCNF (modulated by electrolyte addition), leading to different interfacial properties. Spontaneous OCNF adsorption at the W/O interface occurred for particles with ζ-potential more negative than −30 mV, resulting in the formation of interfacial gels; whilst for particles with ζ-potential of ca. −30 mV, spontaneous adsorption occurred, coupled with augmented interfibrillar interactions, yielding stronger and tougher interfacial gels. On the contrary, charge neutralisation of OCNF (ζ-potential values more positive than −30 mV) did not allow spontaneous adsorption of OCNF at the W/O interface. In the case of favourable OCNF adsorption, the interfacial gel was found to embed oil-rich droplets – a spontaneous emulsification process.
中文翻译：
跨水/油界面的纤维素纳米原纤维的电荷驱动界面胶凝。
跨水/油（W / O）界面生产了通过水分散性氧化纤维素纳米原纤维（OCNF）和油溶性油胺（OA）相互作用获得的界面凝胶。表面流变学实验表明，络合取决于带负电荷的OCNF和OA之间的电荷耦合。发现跨W / O界面的络合物取决于OCNF的ζ电位（受电解质添加的调节），从而导致不同的界面性质。ζ电位大于-30 mV负电的粒子在W / O界面上发生自发OCNF吸附，从而形成界面凝胶。而对于ζ电位约为ca的粒子。-30 mV，发生自发吸附，并伴随增强的原纤维间相互作用，产生更强韧的界面凝胶。相反，OCNF的电荷中和（ζ电位值比-30 mV更正）不允许OCNF在W / O界面上自发吸附。在良好的OCNF吸附的情况下，发现界面凝胶会嵌入富含油的液滴-这是自发的乳化过程。
更新日期：2019-11-07
中文翻译：
跨水/油界面的纤维素纳米原纤维的电荷驱动界面胶凝。
跨水/油（W / O）界面生产了通过水分散性氧化纤维素纳米原纤维（OCNF）和油溶性油胺（OA）相互作用获得的界面凝胶。表面流变学实验表明，络合取决于带负电荷的OCNF和OA之间的电荷耦合。发现跨W / O界面的络合物取决于OCNF的ζ电位（受电解质添加的调节），从而导致不同的界面性质。ζ电位大于-30 mV负电的粒子在W / O界面上发生自发OCNF吸附，从而形成界面凝胶。而对于ζ电位约为ca的粒子。-30 mV，发生自发吸附，并伴随增强的原纤维间相互作用，产生更强韧的界面凝胶。相反，OCNF的电荷中和（ζ电位值比-30 mV更正）不允许OCNF在W / O界面上自发吸附。在良好的OCNF吸附的情况下，发现界面凝胶会嵌入富含油的液滴-这是自发的乳化过程。
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