Clay Nanotube Immobilization on Animal Hair for Sustained Anti-Lice Protection

Rahman, Naureen; Scott, Faith Hannah; Lvov, Yuri; Stavitskaya, Anna; Akhatova, Farida; Коннова, С. А.; Fakhrullina, Gölnur; Fakhrullin, Rawil

doi:10.3390/pharmaceutics13091477

Cited by 16 publications

(18 citation statements)

References 32 publications

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“…Finally, a comparison of the elastic properties suggests that bleaching results in stiffer surfaces (i.e., higher E modulus; Figure 3 b), presumably because the 18-MEA layer provides softness and flexibility in the native state. In many ways, the morphological and nanomechanical features observed before and after damage in Figures 2 and 3 are consistent with previous AFM-based studies on Caucasian human as well as animal hair, 2 , 6 , 22 , 23 suggesting distinct similarities in surface properties and damage mechansism for different hair types.…”

Section: Resultssupporting

confidence: 89%

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Effects of Cosmetic Emulsions on the Surface Properties of Mongolian Hair

Liu¹,

Gräf²,

Hub³

et al. 2022

ACS Omega

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In the light of clean beauty and sustainability requirements emerging in the personal care market, the urgent need for the replacement of silicones in hair conditioners—with comparable performance and customer experience—has been highlighted in the industry. In this context, the goal of the present study was to investigate the physical effects of different silicone-free conditioner formulations on Mongolian hair after damage due to bleaching and compare the results to property changes induced by a classical silicone-containing formulation. To that end, the morphology, structure, and composition of strands and individual fibers of this hair type were characterized before and after bleaching by means of optical microscopy, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). It is shown that oxidative bleaching causes significant damage to the native hair surface, leading to local depletion or even large-area removal of the outer hydrophobic lipid layer. This results in enhanced wettability of the bleached hair by water (as confirmed by contact angle measurements) and is accompanied by an undesired loss of hair gloss and softness. Upon treatment with suitable cosmetic emulsions, the natural hydrophobicity of intact Mongolian hair can be partially or fully restored, with silicone-free formulations having effects similar to those of established silicone-containing products. The successive influence of bleaching and conditioning was further monitored using inverse gas chromatography (iGC), a technique that probes changes in surface energetics and polarity over an ensemble of an entire hair strand through interactions with specific molecules at the solid/gas interface. The resulting data mirror the macroscopic behavior of the bleached/conditioned hair and provide a quantitative scale for measuring damage and repair effects. Most notably, the effect of bleaching and subsequent conditioning on the haptic perception of hair strands could also be quantified with the aid of a biomimetic measurement system, which identifies increased friction (both tactile and sliding) as the major cause for the strawy feel of bleached hair and indicates successful relubrication after treatment with suitable conditioner formulations. Finally, the different physical properties determined for native, bleached, and reconditioned Mongolian hair are found to be reflected in application-oriented tests, namely in vitro measurements of wet and dry combing work. Overall, the data collected in this work shed novel light on the surface properties of Mongolian hair and highlight that effective hair conditioning after damage can be achieved without silicones in advanced cosmetic emulsions based on octyldodecyl myristate and glyceryl oleate.

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Section: Resultssupporting

confidence: 89%

“…Detailed quantitative insights into nanomechanical properties of various types of (treated) hair surfaces can be found elsewhere. 22 , 23 …”

Section: Methodsmentioning

confidence: 99%

Effects of Cosmetic Emulsions on the Surface Properties of Mongolian Hair

Liu¹,

Gräf²,

Hub³

et al. 2022

ACS Omega

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“…In addition, clay nanotubes demonstrate peculiar self-assembly patterns during suspension evaporation and self-assembly on various surfaces, such as planar surfaces, colloid particles, live cells, and fibers ( e . g ., hair). − Understanding the self-assembly behavior of clay nanorods is essential for controlling properties of nanotube-based materials. For all these tasks the investigation of the nanorods’ dynamics plays a crucial role, which ultimately requires a proper methodology to image and assess the motional behavior of nanotubes in liquid environments as well as development of tools for theoretical characterization.…”

Section: Introductionmentioning

confidence: 99%

Probing Diffusive Dynamics of Natural Tubule Nanoclays with Machine Learning

et al. 2022

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Reproducibility of the experimental results and object of study itself is one of the basic principles in science. But what if the object characterized by technologically important properties is natural and cannot be artificially reproduced one-to-one in the laboratory? The situation becomes even more complicated when we are interested in exploring stochastic properties of a natural system and only a limited set of noisy experimental data is available. In this paper we address these problems by exploring diffusive motion of some natural clays, halloysite and sepiolite, in a liquid environment. By using a combination of dark-field microscopy and machine learning algorithms, a quantitative theoretical characterization of the nanotubes’ rotational diffusive dynamics is performed. Scanning the experimental video with the gradient boosting tree method, we can trace time dependence of the diffusion coefficient and probe different regimes of nonequilibrium rotational dynamics that are due to contacts with surfaces and other experimental imperfections. The method we propose is of general nature and can be applied to explore diffusive dynamics of various biological systems in real time.

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“…For each sample were obtained at least 10 AFM scans of cells. The raw AFM data were processed using Nanoscope Analysis v 3.0 software (Bruker) [ 44 ]. At least 50 AFM image sections of the surface area of 400 × 400 nm 2 were used to measure adhesion, Young’s modulus and deformation of individual particles and cell surface.…”

Section: Methodsmentioning

confidence: 99%

Nanomechanical Atomic Force Microscopy to Probe Cellular Microplastics Uptake and Distribution

Akhatova

Ishmukhametov

Fakhrullina

et al. 2022

IJMS

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The concerns regarding microplastics and nanoplastics pollution stimulate studies on the uptake and biodistribution of these emerging pollutants in vitro. Atomic force microscopy in nanomechanical PeakForce Tapping mode was used here to visualise the uptake and distribution of polystyrene spherical microplastics in human skin fibroblast. Particles down to 500 nm were imaged in whole fixed cells, the nanomechanical characterization allowed for differentiation between internalized and surface attached plastics. This study opens new avenues in microplastics toxicity research.

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Clay Nanotube Immobilization on Animal Hair for Sustained Anti-Lice Protection

Cited by 16 publications

References 32 publications

Effects of Cosmetic Emulsions on the Surface Properties of Mongolian Hair

Effects of Cosmetic Emulsions on the Surface Properties of Mongolian Hair

Probing Diffusive Dynamics of Natural Tubule Nanoclays with Machine Learning

Nanomechanical Atomic Force Microscopy to Probe Cellular Microplastics Uptake and Distribution

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