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Special Issue "Chemistry of Aerogels and Their Applications"

A special issue of Molecules (ISSN 1420-3049).

Deadline for manuscript submissions: closed (1 May 2018)

Special Issue Editors

Guest Editor
Prof. Dr. Brigitte Jamart-Grégoire

Université de Lorraine, Nancy, France
Website | E-Mail
Interests: organogels; aerogels; pseudopeptides; foldamers; organic nanotubes; conformational analyses
Guest Editor
Dr. Jacques Bodiguel

Université de Lorraine, Nancy, France
Website | E-Mail
Interests: gels; aerogels; pseudopeptides; self-assembly; conformational analysis

Special Issue Information

Dear Colleagues,

Aerogels are obtained after extraction of the solvent of wet gels using specific processes that allow to replace the solvent with a gas and to maintain the three-dimensional network and the initial volume. As a result, aerogels are nanoporous air-filled solid materials, which are endowed with specific properties, such as very high porosity, a low weight and density, a large surface area and low thermal conductivity. These properties make them suitable for several applications in very different fields, such as insulation, gas or water purification, aerospace, biomedical technologies, etc.

Since the discovery of the first aerogel in 1930, and thanks to advances in aerogel synthesis and their drying technologies, different types of aerogels have emerged including inorganic, organic-and natural-based aerogels.

Despite the fact that aerogels have been long-known as materials, the Special Issue aims to attract contributions from all aspects of the chemistry of recent organic and particularly bio-based, inorganic-based silica, hybrid or composite aerogels. The challenge still remains to further explore the range of their potential applications.

Prof. Dr. Brigitte Jamart-Grégoire
Dr. Jacques Bodiguel
Guest Editors

Manuscript Submission Information

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. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short 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.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Organic aerogel
  • Silica aerogel
  • Hybrid aerogel
  • Composite aerogel
  • Bio-based aerogel
  • Thermal (super) insulators properties
  • Biomedical properties
  • Building applications

Published Papers (3 papers)

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Research

Open AccessArticle Facile Synthesis of Flexible Methylsilsesquioxane Aerogels with Surface Modifications for Sound- Absorbance, Fast Dye Adsorption and Oil/Water Separation
Molecules 2018, 23(4), 945; https://doi.org/10.3390/molecules23040945
Received: 26 March 2018 / Revised: 10 April 2018 / Accepted: 17 April 2018 / Published: 18 April 2018
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Abstract
New flexible methylsilsesquioxane (MSQ) aerogels have been facilely prepared by a sol–gel process with methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) as co-precursors, followed by surface modification and ambient pressure drying. The microstructure, mechanical properties and hydrophobicity of these MSQ aerogels after surface modifications of
[...] Read more.
New flexible methylsilsesquioxane (MSQ) aerogels have been facilely prepared by a sol–gel process with methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) as co-precursors, followed by surface modification and ambient pressure drying. The microstructure, mechanical properties and hydrophobicity of these MSQ aerogels after surface modifications of hexamethyldisiloxane (HMDSO) and/or hexamethyldisilazane (HMDS) were investigated in detail, and the applications of surface-modified MSQ aerogels in sound-absorbance, fast dye adsorption and oil/water separation were evaluated, respectively. The MSQ aerogels surface-modified by HMDS possess flexibility, elasticity and superhydrophobicity, and demonstrate good performance in the mentioned applications. The resultant MSQ aerogel used in sound-absorbance has high frequency (about 6 kHz) acoustic absorptivity of up to 80%, benefiting from its macroporous structure and porosity of 94%, and it also possesses intermediate frequency acoustic absorptivity (about 1 kHz) up to 80% owing to its elasticity. This MSQ aerogel can selectively separate oil from oil/water mixtures with high efficiency due to its superhydrophobicity and superlipophilicity, resulting from a lot of methyl groups, density as low as 0.12 cm3·g−1 and a water contact angle as high as 157°. This MSQ aerogel can be assembled to be a monolithic column applied for fast dye adsorption, and shows selective adsorption for anionic dyes and removal efficiency of methyl orange of up to 95%. Full article
(This article belongs to the Special Issue Chemistry of Aerogels and Their Applications)
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Figure 1

Open AccessArticle A Co-Precursor Approach Coupled with a Supercritical Modification Method for Constructing Highly Transparent and Superhydrophobic Polymethylsilsesquioxane Aerogels
Molecules 2018, 23(4), 797; https://doi.org/10.3390/molecules23040797
Received: 28 February 2018 / Revised: 18 March 2018 / Accepted: 21 March 2018 / Published: 30 March 2018
PDF Full-text (15267 KB) | HTML Full-text | XML Full-text
Abstract
Polymethylsilsesquioxane (PMSQ) aerogels obtained from methyltrimethoxysilane (MTMS) are well-known high-performance porous materials. Highly transparent and hydrophobic PMSQ aerogel would play an important role in transparent vacuum insulation panels. Herein, the co-precursor approach and supercritical modification method were developed to prepare the PMSQ aerogels
[...] Read more.
Polymethylsilsesquioxane (PMSQ) aerogels obtained from methyltrimethoxysilane (MTMS) are well-known high-performance porous materials. Highly transparent and hydrophobic PMSQ aerogel would play an important role in transparent vacuum insulation panels. Herein, the co-precursor approach and supercritical modification method were developed to prepare the PMSQ aerogels with high transparency and superhydrophobicity. Firstly, benefiting from the introduction of tetramethoxysilane (TMOS) in the precursor, the pore structure became more uniform and the particle size was decreased. As the TMOS content increased, the light transmittance increased gradually from 54.0% to 81.2%, whereas the contact angle of water droplet decreased from 141° to 99.9°, ascribed to the increase of hydroxyl groups on the skeleton surface. Hence, the supercritical modification method utilizing hexamethyldisilazane was also introduced to enhance the hydrophobic methyl groups on the aerogel’s surface. As a result, the obtained aerogels revealed superhydrophobicity with a contact angle of 155°. Meanwhile, the developed surface modification method did not lead to any significant changes in the pore structure resulting in the superhydrophobic aerogel with a high transparency of 77.2%. The proposed co-precursor approach and supercritical modification method provide a new horizon in the fabrication of highly transparent and superhydrophobic PMSQ aerogels. Full article
(This article belongs to the Special Issue Chemistry of Aerogels and Their Applications)
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Graphical abstract

Open AccessArticle The Effect of Annealing Treatment and Atom Layer Deposition to Au/Pt Nanoparticles-Decorated TiO2 Nanorods as Photocatalysts
Molecules 2018, 23(3), 525; https://doi.org/10.3390/molecules23030525
Received: 2 January 2018 / Revised: 1 February 2018 / Accepted: 7 February 2018 / Published: 9 February 2018
PDF Full-text (4337 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The wide band gap of TiO2 hinders the utilization of visible light in high-performance photocatalysis. Herein, vertically aligned Ti nanopillar arrays (NPAs) were grown by the glancing angle deposition method (GLAD) and then thermally oxidized into TiO2 NPAs. The metallic nanoparticles
[...] Read more.
The wide band gap of TiO2 hinders the utilization of visible light in high-performance photocatalysis. Herein, vertically aligned Ti nanopillar arrays (NPAs) were grown by the glancing angle deposition method (GLAD) and then thermally oxidized into TiO2 NPAs. The metallic nanoparticles (NPs) were fabricated by successive ion layer adsorption and reaction (SILAR) method. And we covered ultrathin TiO2 layer on Au/Pt NPs decorated NPA using atomic layer deposition (ALD) method and did annealing process in the end. The photoelectrochemical (PEC) performance and dye degradation have been studied. We find the dye degradation efficiency of best combination reaches up to 1.5 times higher than that of original Au/Pt-TiO2 sample under visible light irradiation. The TiO2 ALD layer effectively protects the nanostructure from corrosion and helps the transmission of electrons to the electrolyte. By controlling the annealing temperature we could achieve a matched band gap due to change in noble metal particle size. Our work demonstrates that rational design of composite nanostructures enhances the usage of broader wavelength range light and optimizes photocatalytic degradation of organic pollutants in practical applications. Full article
(This article belongs to the Special Issue Chemistry of Aerogels and Their Applications)
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Graphical abstract

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