Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction

Abstract Particle adhesion onto hydrogels has recently attracted considerable attention because of the potential biomedical applications of the resultant materials. A variety of interactions have been taken advantage of for adsorption, including electrostatic forces, hydrophobic interactions and hyd...

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Autores principales:	Naoko Sato, Yurina Aoyama, Junpei Yamanaka, Akiko Toyotama, Tohru Okuzono
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ea861be584074de6acd1275745a3df6a
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spelling	oai:doaj.org-article:ea861be584074de6acd1275745a3df6a2021-12-02T15:06:20ZParticle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction10.1038/s41598-017-06257-12045-2322https://doaj.org/article/ea861be584074de6acd1275745a3df6a2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06257-1https://doaj.org/toc/2045-2322Abstract Particle adhesion onto hydrogels has recently attracted considerable attention because of the potential biomedical applications of the resultant materials. A variety of interactions have been taken advantage of for adsorption, including electrostatic forces, hydrophobic interactions and hydrogen bonding. In this study, we report significant adsorption of submicron-sized silica particles onto hydrogel surfaces in water, purely by van der Waals (vdW) attraction. The vdW forces enabled strong adhesions between dielectric materials in air. However, because the Hamaker constant decreases in water typically by a factor of approximately 1/100, it is not clear whether vdW attraction is the major driving force in aqueous settings. We investigated the adsorption of silica particles (diameter = 25–600 nm) on poly(acrylamide) and poly(dimethylacrylamide) gels using optical microscopy, under conditions where chemical and electrostatic adsorption is negligible. The quantity of adsorbed particles decreased on decreasing the Hamaker constant by varying the refractive indices of the particles and medium (ethyleneglycol/water), indicating that the adsorption is because of the vdW forces. The adsorption isotherm was discussed based on the adhesive contact model in consideration of the deformation of the gel surface. The present findings will advance the elucidation and development of adsorption in various types of soft materials.Naoko SatoYurina AoyamaJunpei YamanakaAkiko ToyotamaTohru OkuzonoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Naoko Sato Yurina Aoyama Junpei Yamanaka Akiko Toyotama Tohru Okuzono Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
description	Abstract Particle adhesion onto hydrogels has recently attracted considerable attention because of the potential biomedical applications of the resultant materials. A variety of interactions have been taken advantage of for adsorption, including electrostatic forces, hydrophobic interactions and hydrogen bonding. In this study, we report significant adsorption of submicron-sized silica particles onto hydrogel surfaces in water, purely by van der Waals (vdW) attraction. The vdW forces enabled strong adhesions between dielectric materials in air. However, because the Hamaker constant decreases in water typically by a factor of approximately 1/100, it is not clear whether vdW attraction is the major driving force in aqueous settings. We investigated the adsorption of silica particles (diameter = 25–600 nm) on poly(acrylamide) and poly(dimethylacrylamide) gels using optical microscopy, under conditions where chemical and electrostatic adsorption is negligible. The quantity of adsorbed particles decreased on decreasing the Hamaker constant by varying the refractive indices of the particles and medium (ethyleneglycol/water), indicating that the adsorption is because of the vdW forces. The adsorption isotherm was discussed based on the adhesive contact model in consideration of the deformation of the gel surface. The present findings will advance the elucidation and development of adsorption in various types of soft materials.
format	article
author	Naoko Sato Yurina Aoyama Junpei Yamanaka Akiko Toyotama Tohru Okuzono
author_facet	Naoko Sato Yurina Aoyama Junpei Yamanaka Akiko Toyotama Tohru Okuzono
author_sort	Naoko Sato
title	Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
title_short	Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
title_full	Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
title_fullStr	Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
title_full_unstemmed	Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction
title_sort	particle adsorption on hydrogel surfaces in aqueous media due to van der waals attraction
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ea861be584074de6acd1275745a3df6a
work_keys_str_mv	AT naokosato particleadsorptiononhydrogelsurfacesinaqueousmediaduetovanderwaalsattraction AT yurinaaoyama particleadsorptiononhydrogelsurfacesinaqueousmediaduetovanderwaalsattraction AT junpeiyamanaka particleadsorptiononhydrogelsurfacesinaqueousmediaduetovanderwaalsattraction AT akikotoyotama particleadsorptiononhydrogelsurfacesinaqueousmediaduetovanderwaalsattraction AT tohruokuzono particleadsorptiononhydrogelsurfacesinaqueousmediaduetovanderwaalsattraction
_version_	1718388552284241920

Particle Adsorption on Hydrogel Surfaces in Aqueous Media due to van der Waals Attraction

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