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Special Issue "Advances in Sol-gel Derived Materials"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (28 February 2013)

Special Issue Editor

Guest Editor
Prof. Dr. Maryanne M. Collinson (Website)

Department of Chemistry, College of Humanities and Sciences, Virginia Commonwealth University, 1001 West Main Street, P.O. Box 842006, Richmond, Virginia 23284-2006, USA
Fax: +804 828 8599
Interests: sol-gel chemistry; electrochemistry; high surface area materials; materials for separation science; bioanalytical chemistry

Special Issue Information

Submission

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs).

Published Papers (5 papers)

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Research

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Open AccessArticle Liquid Foam Templates Associated with the Sol-Gel Process for Production of Zirconia Ceramic Foams
Materials 2013, 6(5), 1967-1979; doi:10.3390/ma6051967
Received: 27 February 2013 / Revised: 23 April 2013 / Accepted: 6 May 2013 / Published: 10 May 2013
Cited by 7 | PDF Full-text (1283 KB) | HTML Full-text | XML Full-text
Abstract
The unique properties of ceramic foams enable their use in a variety of applications. This work investigated the effects of different parameters on the production of zirconia ceramic foam using the sol-gel process associated with liquid foam templates. Evaluation was made of [...] Read more.
The unique properties of ceramic foams enable their use in a variety of applications. This work investigated the effects of different parameters on the production of zirconia ceramic foam using the sol-gel process associated with liquid foam templates. Evaluation was made of the influence of the thermal treatment temperature on the porous and crystalline characteristics of foams manufactured using different amounts of sodium dodecylsulfate (SDS) surfactant. A maximum pore volume, with high porosity (94%) and a bimodal pore size distribution, was observed for the ceramic foam produced with 10% SDS. Macropores, with an average size of around 30 μm, were obtained irrespective of the SDS amount, while the average size of the supermesopores increased systematically as the SDS amount was increased up to 10%, after which it decreased. X-ray diffraction analyses showed that the sample treated at 500 °C was amorphous, while crystallization into a tetragonal metastable phase occurred at 600 °C due to the presence of sulfate groups in the zirconia structure. At 800 and 1000 °C the monoclinic phase was observed, which is thermodynamically stable at these temperatures. Full article
(This article belongs to the Special Issue Advances in Sol-gel Derived Materials)
Open AccessArticle Organized Silica Films Generated by Evaporation-Induced Self-Assembly as Hosts for Iron Oxide Nanoparticles
Materials 2013, 6(4), 1467-1484; doi:10.3390/ma6041467
Received: 14 January 2013 / Revised: 26 March 2013 / Accepted: 27 March 2013 / Published: 9 April 2013
PDF Full-text (603 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
In this work, we prepared oriented mesoporous thin films of silica on various solid substrates using the pluronic block copolymer P123 as a template. We attempted to insert guest iron oxide (FexOy) nanoparticles into these films by two [...] Read more.
In this work, we prepared oriented mesoporous thin films of silica on various solid substrates using the pluronic block copolymer P123 as a template. We attempted to insert guest iron oxide (FexOy) nanoparticles into these films by two different methods: (a) by co-precipitation—where iron precursors are introduced in the synthesis sol before deposition of the silica film—and subsequent oxide production during the film calcination step; (b) by preparing and calcining the silica films first then impregnating them with the iron precursor, obtaining the iron oxide nanoparticles by a second calcination step. We have examined the structural effects of the guest nanoparticles on the silica film structures using grazing incidence X-ray scattering (GISAXS), high-resolution transmission electron spectroscopy (HRTEM), spectroscopic ellipsometry, X-ray photoelectron spectroscopy (XPS), and Raman microscopy. Formation of nanoparticles by co-precipitation may induce substantial changes in the film structure leading, in our adopted process, to the appearance of lamellar ordering in the calcination stage. On the contrary, impregnation-based approaches perturb the film structures much more weakly, but are also less efficient in filling the pores with nanoparticles. Full article
(This article belongs to the Special Issue Advances in Sol-gel Derived Materials)
Figures

Open AccessArticle Structural and Luminescence Properties of Lu2O3:Eu3+ F127 Tri-Block Copolymer Modified Thin Films Prepared by Sol-Gel Method
Materials 2013, 6(3), 713-725; doi:10.3390/ma6030713
Received: 4 January 2013 / Revised: 7 February 2013 / Accepted: 16 February 2013 / Published: 26 February 2013
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Abstract
Lu2O3:Eu3+ transparent, high density, and optical quality thin films were prepared using the sol-gel dip-coating technique, starting with lutetium and europium nitrates as precursors and followed by hydrolysis in an ethanol-ethylene glycol solution. Acetic acid and acetylacetonate [...] Read more.
Lu2O3:Eu3+ transparent, high density, and optical quality thin films were prepared using the sol-gel dip-coating technique, starting with lutetium and europium nitrates as precursors and followed by hydrolysis in an ethanol-ethylene glycol solution. Acetic acid and acetylacetonate were incorporated in order to adjust pH and as a sol stabilizer. In order to increment the thickness of the films and orient the structure, F127 Pluronic acid was incorporated during the sol formation. Structural, morphological, and optical properties of the films were investigated for different F127/Lu molar ratios (0–5) in order to obtain high optical quality films with enhanced thickness compared with the traditional method. X-ray diffraction (XRD) shows that the films present a highly oriented cubic structure <111> beyond 1073 K for a 3-layer film, on silica glass substrates. The thickness, density, porosity, and refractive index evolution of the films were investigated by means of m-lines microscopy along with the morphology by scanning electron microscope (SEM) and luminescent properties. Full article
(This article belongs to the Special Issue Advances in Sol-gel Derived Materials)
Open AccessArticle Thermal Annealing Effect on Optical Properties of Binary TiO2-SiO2 Sol-Gel Coatings
Materials 2013, 6(1), 76-84; doi:10.3390/ma6010076
Received: 15 November 2012 / Revised: 10 December 2012 / Accepted: 17 December 2012 / Published: 24 December 2012
Cited by 7 | PDF Full-text (207 KB) | HTML Full-text | XML Full-text
Abstract
TiO2-SiO2 binary coatings were deposited by a sol-gel dip-coating method using tetrabutyl titanate and tetraethyl orthosilicate as precursors. The structure and chemical composition of the coatings annealed at different temperatures were analyzed by Raman spectroscopy and Fourier Transform Infrared [...] Read more.
TiO2-SiO2 binary coatings were deposited by a sol-gel dip-coating method using tetrabutyl titanate and tetraethyl orthosilicate as precursors. The structure and chemical composition of the coatings annealed at different temperatures were analyzed by Raman spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy. The refractive indices of the coatings were calculated from the measured transmittance and reflectance spectra. An increase in refractive index with the high temperature thermal annealing process was observed. The Raman and FTIR results indicate that the refractive index variation is due to changes in the removal of the organic component, phase separation and the crystal structure of the binary coatings. Full article
(This article belongs to the Special Issue Advances in Sol-gel Derived Materials)

Review

Jump to: Research

Open AccessReview A Special Material or a New State of Matter: A Review and Reconsideration of the Aerogel
Materials 2013, 6(3), 941-968; doi:10.3390/ma6030941
Received: 4 January 2013 / Revised: 19 February 2013 / Accepted: 4 March 2013 / Published: 8 March 2013
Cited by 57 | PDF Full-text (1741 KB) | HTML Full-text | XML Full-text
Abstract
The ultrahighly nanoporous aerogel is recognized as a state of matter rather than as a functional material, because of its qualitative differences in bulk properties, transitional density and enthalpy between liquid and gas, and diverse chemical compositions. In this review, the characteristics, [...] Read more.
The ultrahighly nanoporous aerogel is recognized as a state of matter rather than as a functional material, because of its qualitative differences in bulk properties, transitional density and enthalpy between liquid and gas, and diverse chemical compositions. In this review, the characteristics, classification, history and preparation of the aerogel were introduced. More attention was paid to the sol-gel method for preparing different kinds of aerogels, given its important role on bridging the synthetic parameters with the properties. At last, preparation of a novel single-component aerogel, design of a composite aerogel and industrial application of the aerogel were regarded as the research tendency of the aerogel state in the near future. Full article
(This article belongs to the Special Issue Advances in Sol-gel Derived Materials)

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