Peddireddy Karthik R, Nicolai Taco, Benyahia Lazhar, Capron Isabelle
LUNAM Université du Maine, IMMM UMR-CNRS 6283, 72085 Cedex 9 Le Mans, France.
UR1268 Biopolymères, Interactions et Assemblages, INRA, F-44316 Nantes, France.
ACS Macro Lett. 2016 Mar 15;5(3):283-286. doi: 10.1021/acsmacrolett.5b00953. Epub 2016 Feb 9.
Water-in-water (W/W) emulsions formed by mixing incompatible water-soluble polymers cannot be stabilized with molecular surfactants. However, they can be stabilized by particles through the so-called Pickering effect. Recently, it was shown that its stabilization can be achieved also with nanoplates. Here, we show for the first time that even nanorods in the form of cellulose nanocrystals (CNCs) can efficiently stabilize W/W emulsions. Static light scattering and confocal microscopy techniques were used to determine the surface coverage by CNCs. In the presence of 50 mM NaCl very weak gels were formed by excess CNCs in the continuous phase. In this way creaming of the dispersed phase could be arrested. The nontoxicity, sustainability, and low cost of CNCs and the abundant availability of cellulose render these nanorods potentially highly suited for preparing W/W emulsions.
通过混合互不相容的水溶性聚合物形成的水包水（W/W）乳液不能用分子表面活性剂来稳定。然而，它们可以通过颗粒借助所谓的皮克林效应来稳定。最近，研究表明纳米片也能实现其稳定作用。在此，我们首次表明，即使是纤维素纳米晶体（CNC）形式的纳米棒也能有效地稳定W/W乳液。使用静态光散射和共聚焦显微镜技术来确定CNC的表面覆盖率。在存在50 mM氯化钠的情况下，连续相中过量的CNC形成了非常弱的凝胶。通过这种方式，可以阻止分散相的上浮。CNC的无毒、可持续性、低成本以及纤维素的丰富可得性使得这些纳米棒潜在地非常适合制备W/W乳液。
