Smart tailoring of the surface chemistry in GPTMS hybrid organic–inorganic films

Carboni, Davide; Pinna, Alessandra; Malfatti, Luca; Innocenzi, Plinio

doi:10.1039/c3nj01385e

Cited by 22 publications

(20 citation statements)

References 22 publications

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“…The spectrum of GP-Al is also shown in Figure 5 (curve c). As no peak appears at 1255 cm À1 it can be concluded that the epoxide ring has been completely converted to the diol moiety [49]. The FTIR spectrum of B-GP-Al can likewise be seen in Figure 5 (curve d).…”

Section: Ftirmentioning

confidence: 82%

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Modification of cotton fabrics with a hydrolysed organotrialkoxysilane/metal alkoxide system: multifunctionalisation and mordant dyeing

Schramm

Rinderer

2017

Coloration Technology

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Untreated cotton fabrics and cotton samples pretreated with 1,2,3,4-butanetetracarboxylic acid were functionalised with an organotrialkoxysilane [(3-glycidyloxy)propyltrimethoxysilane] in conjunction with a metal alkoxide (aluminium isopropoxide, titanium tetraisopropoxide, or zircon tetrabutoxide). Evaluation of the physicomechanical properties revealed that the dry crease recovery angle was significantly increased in the case of aluminium isopropoxide, whereas the tensile strength and the tear strength were reduced. The application of alkyltrialkoxysilanes resulted in an enhanced contact angle. As the cotton samples were treated with hydrolysed metal alkoxides, which can function as mordants, the cotton fabrics were dyed with alizarin.

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Section: Ftirmentioning

confidence: 82%

“…Adsorbed water causes the peak at 1645 cm À1 . As no peak appears at 1255 cm À1 it can be concluded that the epoxide ring has been completely converted to the diol moiety [49]. The absorption bands at 1365 and 1319 cm À1 can be assigned to the C-H bending (deformation stretch) and CH wagging vibrations respectively.…”

Section: Ftirmentioning

confidence: 97%

Modification of cotton fabrics with a hydrolysed organotrialkoxysilane/metal alkoxide system: multifunctionalisation and mordant dyeing

Schramm

Rinderer

2017

Coloration Technology

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“…Although Gabrielli et al [73] reported that at a lower pH the rate of epoxide ring opening and hydrolysis increased, it was not determined for basic conditions due to precipitation. At a neutral pH (in PBS), it has been reported that GPTMS is very stable; however, the presence of nucleophiles catalyses the ring opening reaction [75,76]. In the current work, nucleophiles on the gelatin chains (carboxylic acid and amine groups) as well as the elevated temperature (40°C) acted as the catalyst for the ring opening reaction, according to [60].…”

Section: Structural Characterisation and Inorganic Contentmentioning

confidence: 93%

Hybrid sol–gel inorganic/gelatin porous fibres via solution blow spinning

et al. 2017

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Hybrid sol-gel inorganic-organic fibres offer great potential in tissue engineering and regenerative medicine. A significant challenge is to process them using scalable technologies into useful scaffolds that provide control over fibre diameter, morphology, mechanical properties, ion release, degradation and cell response. In this work we develop formulations that are amenable to processing via solution blow spinning (SBS), a rapid technique using simple equipment to spray nano-/ micro-fibres without any electric fields. The technique is extended to produce porous class I and II hybrid fibres using cryogenic SBS, with formulations developed based on tetraethyl orthosilicate/gelatin that are relatively facile to lyophilise. The formulations developed here take advantage of the reversible thermally activated conformation change of gelatin in aqueous solutions from random coil to triple helix to enable viscosity tuning and therefore fibre spinning. Gelatin is functionalised with (3-glycidyloxypropyl)trimethoxysilane to produce class II hybrids which exhibit controllable time-and temperature-dependent viscosity profiles which can be tuned for spinning into highly porous fibres.Ryan D. Greenhalgh and William S. Ambler are joint first authors due to equal contribution.

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“…However, in order to preserve the structural integrity of the magnetic core, an intermediate hybrid organic-inorganic shell should be designed with organic functionalities capable of anchoring the organogel to the iron oxide nanoparticles. Considering the previous experience acquired by our group in the field of hybrid sol-gel materials [11][12][13][14], these functionalities have been envisaged in two organosilanes, the vinyl-triethoxysilane and the amino-propyl-triethoxy-silane. In fact, taking inspiration from previous literature reports on molecularly imprinted catalytic microgels [15], the amino group of the organosilane could provide a good grafting point for a Nprotected arginine molecule.…”

Section: Introductionmentioning

confidence: 99%

Magnetic core–shell nanoparticles coated with a molecularly imprinted organogel for organophosphate hydrolysis

Carboni

Lasio

Malfatti

et al. 2016

J Sol-Gel Sci Technol

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Catalytic core-shell nanoparticles were obtained by coating an iron oxide core with a hybrid organic-inorganic silica shell using vinyl-triethoxy-silane and aminopropyl-triethoxy-silane. The amino group was further functionalised with arginine, used as catalytic moiety for the inactivation of organophosphate pesticides through hydrolysis. By exploiting the vinyl groups of the organosilica as anchorage, an additional outer layer made by molecularly imprinted organogel was built up through high-dilution radical polymerisation. The resulting organogel contains the imprinting complex, which derives from the guanidinium groups of the arginine and the organophosphate used as molecular template. The removal of the organophosphate from the imprinted cavities allowed obtaining core-shell magnetic nanoparticles with a molecularly imprinted acrylamide-based outer layer. These nanoparticles are capable of hydrolysing the commercial pesticide Paraoxon with a reaction rate 50 % faster than the corresponding background hydrolysis. Graphical Abstract

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Smart tailoring of the surface chemistry in GPTMS hybrid organic–inorganic films

Abstract: The tuning of epoxide opening in GPTMS films allows for smart tailoring of the surface chemistry.

Cited by 22 publications

References 22 publications

Modification of cotton fabrics with a hydrolysed organotrialkoxysilane/metal alkoxide system: multifunctionalisation and mordant dyeing

Modification of cotton fabrics with a hydrolysed organotrialkoxysilane/metal alkoxide system: multifunctionalisation and mordant dyeing

Hybrid sol–gel inorganic/gelatin porous fibres via solution blow spinning

Magnetic core–shell nanoparticles coated with a molecularly imprinted organogel for organophosphate hydrolysis

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