Special Issue "Synthesis and Characterisation of Aerogels: Fundamentals and Applications"

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Chemistry".

Deadline for manuscript submissions: 28 February 2022.

Special Issue Editors

Dr. Firouzeh Sabri
E-Mail Website
Guest Editor
Department of Physics and Materials Science, University of Memphis, Memphis, TN 38152, USA
Interests: aerogels; sensors; composites; polymers; thermographic phosphors; thermometry; biophysics; neural prosthetics; biomedical; remote sensing; in vivo; in vitro; scaffolds
Dr. Carlos A. García-González
E-Mail Website1 Website2
Guest Editor
Department of Pharmacology, Pharmacy and Pharmaceutical Technology, University of Santiago de Compostela, 15782 - Santiago de Compostela, Spain
Interests: aerogels; supercritical fluids; regenerative medicine; pharmaceutical technology; 3D-bioprinting; porous materials; scaffolds; biomedical applications
Special Issues, Collections and Topics in MDPI journals
Dr. Patrina Paraskevopoulou
E-Mail Website
Guest Editor
Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece
Interests: nanostructured materials and polymers; aerogels; metathesis polymerizaton; electrochemistry; atom-transfer reactions; clusters with metal-metal bonds

Special Issue Information

Dear Colleagues,

Aerogels are versatile materials with unique mesoporous structures that offer advantages over other classes of materials. From aerospace to biomedical applications, aerogels can be manipulated to fit a diverse set of technological and scientific needs. In recent years, remarkable progress has been made in the synthesis and characterisation of a wide variety of aerogels, and as a result, the application space has also broadened. We invite you to submit your work to this Special Issue, which is intentionally designed to cover a broad range of topics in aerogel research. This issue aims to highlight the breadth of ongoing aerogel research, both at the fundamental level as well as in the application space.

Dr. Firouzeh Sabri
Dr. Carlos A. García-González
Dr. Patrina Paraskevopoulou
Guest Editors

Keywords

  • Aerogels
  • Biomedical applications
  • 3D-structural modelling
  • Nanoporosity
  • Nanostructured materials
  • Polymer nanocomposites
  • Biomaterials
  • Shape memory materials
  • Carbons
  • Inorganic oxides and metals
  • Catalysis
  • Sensors and actuators
  • Environmental and energy applications
  • Mechanical properties
  • Electrical properties
  • Rheological properties
  • Thermal properties
  • Acoustic attenuation
  • 3D-printing
  • Foaming
  • Supercritical drying
  • Freeze-drying
  • Microscopy
  • Spectroscopy
  • Adsorption
  • Chemisorption

Published Papers (3 papers)

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Research

Article
Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method
Polymers 2021, 13(15), 2409; https://doi.org/10.3390/polym13152409 - 22 Jul 2021
Cited by 1 | Viewed by 599
Abstract
Organic aerogels in the form of powder, microgranules and microsized particles receive considerable attention due to their easy fabrication, low process time and costs compared to their monolithic form. Here, we developed resorcinol-formaldehyde (RF) aerogel microparticles by using an emulsion-gelation method. The main [...] Read more.
Organic aerogels in the form of powder, microgranules and microsized particles receive considerable attention due to their easy fabrication, low process time and costs compared to their monolithic form. Here, we developed resorcinol-formaldehyde (RF) aerogel microparticles by using an emulsion-gelation method. The main objective of this study is to investigate the influence of curing time, stirring rate, RF sol:oil ratio and initial pH of the sol in order to control the size and properties of the microparticles produced. The emulsion-gelation of RF sol prepared with sodium carbonate catalyst in an oil phase at 60 °C was explored. RF microparticles were washed with ethanol to remove the oil phase followed by supercritical and ambient pressure drying. The properties of the dried RF microparticles were analyzed using FT-IR, N2 adsorption isotherm, gas pycnometry, wide angle X-ray scattering and scanning electron microscope. RF microparticles with high surface area up to 543 m2/g and large pore volume of 1.75 cm3/g with particle sizes ranging from 50–425 µm were obtained. Full article
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Article
Influence of the Impregnation Technique on the Release of Esomeprazole from Various Bioaerogels
Polymers 2021, 13(11), 1882; https://doi.org/10.3390/polym13111882 - 06 Jun 2021
Cited by 1 | Viewed by 739
Abstract
The presented study shows the possibility of using bioaerogels, namely neat alginate, pectin, chitosan aerogels, and alginate and pectin aerogels coated with chitosan, as drug delivery systems for esomeprazole. Two different techniques were used for the impregnation of esomeprazole: Supercritical impregnation, and diffusion [...] Read more.
The presented study shows the possibility of using bioaerogels, namely neat alginate, pectin, chitosan aerogels, and alginate and pectin aerogels coated with chitosan, as drug delivery systems for esomeprazole. Two different techniques were used for the impregnation of esomeprazole: Supercritical impregnation, and diffusion via ethanol during the sol-gel synthesis. The prepared samples were characterized by employing N2 adsorption-desorption analysis, TGA/DSC, and FTIR. The achieved loadings were satisfactory for all the tested samples and showed to be dependent on the technique used for impregnation. In all cases, higher loadings were achieved when impregnation via diffusion from ethanol was used. Extensive release studies were performed for all impregnated samples. The in vitro dissolution profiles were found to be dependent on the carrier and impregnation method used. Most importantly, in all cases more controlled and delayed release was achieved with the bioaerogels compared to using pure esomeprazole. Full article
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Article
False Morphology of Aerogels Caused by Gold Coating for SEM Imaging
Polymers 2021, 13(4), 588; https://doi.org/10.3390/polym13040588 - 16 Feb 2021
Cited by 4 | Viewed by 839
Abstract
The imaging of non-conducting materials by scanning electron microscopy (SEM) is most often performed after depositing few nanometers thick conductive layers on the samples. It is shown in this work, that even a 5 nm thick sputtered gold layer can dramatically alter the [...] Read more.
The imaging of non-conducting materials by scanning electron microscopy (SEM) is most often performed after depositing few nanometers thick conductive layers on the samples. It is shown in this work, that even a 5 nm thick sputtered gold layer can dramatically alter the morphology and the surface structure of many different types of aerogels. Silica, polyimide, polyamide, calcium-alginate and cellulose aerogels were imaged in their pristine forms and after gold sputtering utilizing low voltage scanning electron microscopy (LVSEM) in order to reduce charging effects. The morphological features seen in the SEM images of the pristine samples are in excellent agreement with the structural parameters of the aerogels measured by nitrogen adsorption-desorption porosimetry. In contrast, the morphologies of the sputter coated samples are significantly distorted and feature nanostructured gold. These findings point out that extra care should be taken in order to ensure that gold sputtering does not cause morphological artifacts. Otherwise, the application of low voltage scanning electron microscopy even yields high resolution images of pristine non-conducting aerogels. Full article
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