Inclusion of Laponite nanoparticles in a lyotropic lamellar phase

IF 1.8 4区 生物学 Q3 BIOPHYSICS
Girlane Castro Costa Leite, Gilson Carlos Castro Costa Leite
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引用次数: 2

Abstract

In this work, we consider a ternary system formed by a surfactant with a lamellar phase (lecithin) that was doped with a solution of Laponite at 1% by volume. The inclusion of nanoparticles in the lamellar phase was investigated by the small-angle X-ray scattering (SAXS) technique, which revealed three types of structures according to the observed scattering pattern. The lamellar period increased linearly with hydration up to a certain limit; this type of behavior is not the same as that found for a similar system using AOT as a surfactant. In the region that corresponds to an isotropic phase, it was observed that the period corresponds to 60??, and in the lamellar system of pure lecithin, with the same volumetric fraction (1/φ?=?0.66), the corresponding periodicity is 62??, indicating that the presence of Laponite nanoparticles increases the attractive interaction, reducing the lamellar period, causing the bilayer to become more rigid, that is, with less fluctuations. In the more diluted region, the periodicity reached a limit value of 64??, which is slightly higher than the lamellar system in the absence of Laponite particles, so there was an expansion of the lamellar phase due to the lack of consistency of Laponite nanoparticles. In the more concentrated lamellar phase (under strong confinement), it was observed that the distance between the bilayers decreased, establishing a long-range order.

Abstract Image

溶变层状相中钛矿纳米颗粒的包合
在这项工作中,我们考虑了一个三元体系,由表面活性剂与层状相(卵磷脂)形成,并以1%体积的拉脱石溶液掺杂。利用小角x射线散射(SAXS)技术研究了纳米颗粒在片层相中的包裹体,根据观察到的散射模式,发现了三种类型的纳米颗粒结构。层状周期随水化程度的增加而线性增加,直至一定限度;这种类型的行为与使用AOT作为表面活性剂的类似体系的行为不同。在与各向同性相对应的区域,观察到周期对应于60??在相同体积分数(1/φ?= 0.66)的纯卵磷脂片层体系中,相应的周期为62??,表明拉脱石纳米颗粒的存在增加了吸引相互作用,缩短了片层周期,使双层变得更加刚性,即波动更小。在较稀释的区域,周期达到了64??的极限值。,略高于不含拉脱石颗粒时的片层相,说明拉脱石纳米颗粒的稠度不足导致了片层相的膨胀。在较浓的层状相中(在强约束下),观察到双层之间的距离减小,建立了一个长时间的顺序。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Biological Physics
Journal of Biological Physics 生物-生物物理
CiteScore
3.00
自引率
5.60%
发文量
20
审稿时长
>12 weeks
期刊介绍: Many physicists are turning their attention to domains that were not traditionally part of physics and are applying the sophisticated tools of theoretical, computational and experimental physics to investigate biological processes, systems and materials. The Journal of Biological Physics provides a medium where this growing community of scientists can publish its results and discuss its aims and methods. It welcomes papers which use the tools of physics in an innovative way to study biological problems, as well as research aimed at providing a better understanding of the physical principles underlying biological processes.
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