Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials

Supramolecular gels are an important and interesting class of soft materials that show great potential for many applications. Most of them have been discovered serendipitously, and understanding the supramolecular self-assembly that leads to the formation of the gel superstructure is the key to the...

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Autores principales: Edelsztein, Valeria Carolina, Di Chenna, Pablo Héctor
Publicado: 2013
Materias:
Hansen parameters
Nanotube
Organogel
Self-assembly
Supramolecular gel
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18605397_v9_n_p1826_Edelsztein
http://hdl.handle.net/20.500.12110/paper_18605397_v9_n_p1826_Edelsztein
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_18605397_v9_n_p1826_Edelsztein
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spelling paper:paper_18605397_v9_n_p1826_Edelsztein2023-06-08T16:29:27Z Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials Edelsztein, Valeria Carolina Di Chenna, Pablo Héctor Hansen parameters Nanotube Organogel Self-assembly Supramolecular gel Supramolecular gels are an important and interesting class of soft materials that show great potential for many applications. Most of them have been discovered serendipitously, and understanding the supramolecular self-assembly that leads to the formation of the gel superstructure is the key to the directed design of new organogels. We report herein the organogelating property of four stereoisomers of the simple steroid 2, 3-dihydroxycholestane. Only the isomer with the trans-diaxial hydroxy groups had the ability to gelate a broad variety of liquids and, thus, to be a super-organogelator for hydrocarbons. The scope of solvent gelation was analysed with regard to two solvent parameters, namely the Kamlet-Taft and the Hansen solubility parameters. The best correlation was observed with the Hansen approach that revealed the existence of two clear gelation zones. We propose a general model of self-assembly through multiple intermolecular hydrogen bonds between the 1, 2-dihydroxy system, which is based on experimental data and computational simulations revealing the importance of the di-axial orientation of the hydroxy groups for the one-dimensional self-assembly. Under controlled conditions, the fibrillar superstructure of the organogel was successfully used as a template for the in-situ sol-gel polymerization of tetraethoxysilane and the further preparation of silica nanotubes. We propose that the driving forces for templating are hydrogen bonding and electrostatic interactions between the anionic silicate intermediate species and the self-assembled fibrillar network. © 2013 Edelsztein et al. Fil:Edelsztein, V.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Di Chenna, P.H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18605397_v9_n_p1826_Edelsztein http://hdl.handle.net/20.500.12110/paper_18605397_v9_n_p1826_Edelsztein
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Hansen parameters
Nanotube
Organogel
Self-assembly
Supramolecular gel
spellingShingle Hansen parameters
Nanotube
Organogel
Self-assembly
Supramolecular gel
Edelsztein, Valeria Carolina
Di Chenna, Pablo Héctor
Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
topic_facet Hansen parameters
Nanotube
Organogel
Self-assembly
Supramolecular gel
description Supramolecular gels are an important and interesting class of soft materials that show great potential for many applications. Most of them have been discovered serendipitously, and understanding the supramolecular self-assembly that leads to the formation of the gel superstructure is the key to the directed design of new organogels. We report herein the organogelating property of four stereoisomers of the simple steroid 2, 3-dihydroxycholestane. Only the isomer with the trans-diaxial hydroxy groups had the ability to gelate a broad variety of liquids and, thus, to be a super-organogelator for hydrocarbons. The scope of solvent gelation was analysed with regard to two solvent parameters, namely the Kamlet-Taft and the Hansen solubility parameters. The best correlation was observed with the Hansen approach that revealed the existence of two clear gelation zones. We propose a general model of self-assembly through multiple intermolecular hydrogen bonds between the 1, 2-dihydroxy system, which is based on experimental data and computational simulations revealing the importance of the di-axial orientation of the hydroxy groups for the one-dimensional self-assembly. Under controlled conditions, the fibrillar superstructure of the organogel was successfully used as a template for the in-situ sol-gel polymerization of tetraethoxysilane and the further preparation of silica nanotubes. We propose that the driving forces for templating are hydrogen bonding and electrostatic interactions between the anionic silicate intermediate species and the self-assembled fibrillar network. © 2013 Edelsztein et al.
author Edelsztein, Valeria Carolina
Di Chenna, Pablo Héctor
author_facet Edelsztein, Valeria Carolina
Di Chenna, Pablo Héctor
author_sort Edelsztein, Valeria Carolina
title Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
title_short Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
title_full Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
title_fullStr Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
title_full_unstemmed Self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
title_sort self-assembly of 2, 3-dihydroxycholestane steroids into supramolecular organogels as a soft template for the in-situ generation of silicate nanomaterials
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18605397_v9_n_p1826_Edelsztein
http://hdl.handle.net/20.500.12110/paper_18605397_v9_n_p1826_Edelsztein
work_keys_str_mv AT edelszteinvaleriacarolina selfassemblyof23dihydroxycholestanesteroidsintosupramolecularorganogelsasasofttemplatefortheinsitugenerationofsilicatenanomaterials
AT dichennapablohector selfassemblyof23dihydroxycholestanesteroidsintosupramolecularorganogelsasasofttemplatefortheinsitugenerationofsilicatenanomaterials
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