Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate

In this paper we report the synthesis of a new steroid-based low-molecular weight organogelator, the analysis of the self-assembled fibrilar network (SAFIN) and its use as template for the preparation of SiO2 nanotubes. This novel steroidal organogelator has a unique structure among the well known f...

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Autores principales: Edelsztein, V.C., Burton, G., Di Chenna, P.H.
Formato: JOUR
Materias:
Organogel
Silica nanotubes
Steroid
Template
nanotube
silane derivative
silicate
silicon dioxide
steroid
tetraethoxysilane
article
chemical analysis
chemical structure
hydrogen bond
polymerization
priority journal
silylation
synthesis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00404020_v66_n12_p2162_Edelsztein
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00404020_v66_n12_p2162_Edelsztein
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spelling todo:paper_00404020_v66_n12_p2162_Edelsztein2023-10-03T14:50:44Z Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate Edelsztein, V.C. Burton, G. Di Chenna, P.H. Organogel Silica nanotubes Steroid Template nanotube silane derivative silicate silicon dioxide steroid tetraethoxysilane article chemical analysis chemical structure hydrogen bond polymerization priority journal silylation synthesis In this paper we report the synthesis of a new steroid-based low-molecular weight organogelator, the analysis of the self-assembled fibrilar network (SAFIN) and its use as template for the preparation of SiO2 nanotubes. This novel steroidal organogelator has a unique structure among the well known family of steroid-based organogelators, the most important characteristic of this molecule is the presence of a silyl ether group at C-3 together with a 6β,19-oxo bridge. It was capable to gelate hydrocarbons and tetraethyl orthosilicate at very low concentrations (<1 wt %). An insight into the aggregation mechanism is provided revealing that complementary interaction between an α-oriented hydrogen bond donor and a β-oriented acceptor on the steroid skeleton is the driving force for the primary 1D self-assembly. The SAFIN was successfully used as template to grow silica nanotubes (external diameter: 40-60 nm, internal diameter: 7 nm and several micrometers length) through a catalyst-free in situ co-assembly polymerization process. Hydrogen bond or electrostatic interactions between the anionic silicate intermediate species and the SAFIN are proposed to be the driving force for templating. © 2010 Elsevier Ltd. All rights reserved. Fil:Edelsztein, V.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Burton, G. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00404020_v66_n12_p2162_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 Organogel
Silica nanotubes
Steroid
Template
nanotube
silane derivative
silicate
silicon dioxide
steroid
tetraethoxysilane
article
chemical analysis
chemical structure
hydrogen bond
polymerization
priority journal
silylation
synthesis
spellingShingle Organogel
Silica nanotubes
Steroid
Template
nanotube
silane derivative
silicate
silicon dioxide
steroid
tetraethoxysilane
article
chemical analysis
chemical structure
hydrogen bond
polymerization
priority journal
silylation
synthesis
Edelsztein, V.C.
Burton, G.
Di Chenna, P.H.
Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
topic_facet Organogel
Silica nanotubes
Steroid
Template
nanotube
silane derivative
silicate
silicon dioxide
steroid
tetraethoxysilane
article
chemical analysis
chemical structure
hydrogen bond
polymerization
priority journal
silylation
synthesis
description In this paper we report the synthesis of a new steroid-based low-molecular weight organogelator, the analysis of the self-assembled fibrilar network (SAFIN) and its use as template for the preparation of SiO2 nanotubes. This novel steroidal organogelator has a unique structure among the well known family of steroid-based organogelators, the most important characteristic of this molecule is the presence of a silyl ether group at C-3 together with a 6β,19-oxo bridge. It was capable to gelate hydrocarbons and tetraethyl orthosilicate at very low concentrations (<1 wt %). An insight into the aggregation mechanism is provided revealing that complementary interaction between an α-oriented hydrogen bond donor and a β-oriented acceptor on the steroid skeleton is the driving force for the primary 1D self-assembly. The SAFIN was successfully used as template to grow silica nanotubes (external diameter: 40-60 nm, internal diameter: 7 nm and several micrometers length) through a catalyst-free in situ co-assembly polymerization process. Hydrogen bond or electrostatic interactions between the anionic silicate intermediate species and the SAFIN are proposed to be the driving force for templating. © 2010 Elsevier Ltd. All rights reserved.
format JOUR
author Edelsztein, V.C.
Burton, G.
Di Chenna, P.H.
author_facet Edelsztein, V.C.
Burton, G.
Di Chenna, P.H.
author_sort Edelsztein, V.C.
title Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
title_short Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
title_full Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
title_fullStr Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
title_full_unstemmed Self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
title_sort self-assembly of a silylated steroid-based organogelator and its use as template for the in situ sol-gel polymerization of tetraethyl orthosilicate
url http://hdl.handle.net/20.500.12110/paper_00404020_v66_n12_p2162_Edelsztein
work_keys_str_mv AT edelszteinvc selfassemblyofasilylatedsteroidbasedorganogelatoranditsuseastemplatefortheinsitusolgelpolymerizationoftetraethylorthosilicate
AT burtong selfassemblyofasilylatedsteroidbasedorganogelatoranditsuseastemplatefortheinsitusolgelpolymerizationoftetraethylorthosilicate
AT dichennaph selfassemblyofasilylatedsteroidbasedorganogelatoranditsuseastemplatefortheinsitusolgelpolymerizationoftetraethylorthosilicate
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