elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Towards a Synthesis of Resorcinol-Formaldehyde Aerogel Microparticles

Kamal Mohamed, Seeni Meera and Heinrich, Charlotte and Milow, Barbara (2020) Towards a Synthesis of Resorcinol-Formaldehyde Aerogel Microparticles. Online Seminar on Aerogels – 2020, 16.-18 September 2020, Hamburg, Germany.

[img] PDF - Only accessible within DLR
71kB

Official URL: http://www.aerogel.org/community/seminar2020/

Abstract

Resorcinol-Formaldehyde (RF) aerogels are an important class of organic aerogels, which can be converted to carbon materials with remarkable properties. Carbon aerogels find applications in electrodes, batteries, foundries, adsorbents, etc. In foundry technology, aerogels can be used as binders and additives for sand cores and molds for the casting process. In the past, aerogel granulates were used as an additive in foundry sands to reduce casting defects by avoiding metal penetration and core collapse. The surface smoothness of the casting is improved and the emission of casting gas can be reduced. Traditionally, RF monoliths are prepared by aqueous poly-condensation of reactants under alkaline conditions, drying and further grinding into particles. Due to their poor mechanical performance, grinding of monoliths into specific size granules is not an easy task. Thus grinded particles have a broad particle size distribution and irregular shape. Hence, an alternative approach is required to produce RF microparticles, preferably a process of simple fabrication, reduced process time, lower equipment costs and easy handling. Emulsion-gelation method is an important technique to produce larger quantities of aerogel microparticles in a robust and controlled way. Here, we report the preparation of RF aerogel microparticles by emulsion-gelation method. The aqueous RF sol was prepared by mixing resorcinol, formaldehyde, H2O and Na2CO3 under stirring at room temperature. RF sol was slowly added to the rapeseed oil phase under stirring at 60 °C. After 3h, the suspension containing spheres was kept at 60 °C in an oven for curing. The cured spheres were washed and the solvent was exchanged for further drying using supercritical and ambient methods. The physical and chemical properties of the dried RF particles were analyzed using FT-IR, N2 adsorption isotherms, gas pycnometry, TGA and SEM. RF particles with surface area of 284 m2/g, pore volume of 0.88 cm3/g, pore diameter of 11.1 nm and average particle diameter of 200 µm were produced.

Item URL in elib:https://elib.dlr.de/136193/
Document Type:Conference or Workshop Item (Poster)
Title:Towards a Synthesis of Resorcinol-Formaldehyde Aerogel Microparticles
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kamal Mohamed, Seeni MeeraUNSPECIFIEDhttps://orcid.org/0000-0002-8812-1362UNSPECIFIED
Heinrich, CharlotteUNSPECIFIEDhttps://orcid.org/0000-0002-8970-9598UNSPECIFIED
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Date:2020
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Aerogels, Microparticles, Resorcinol-Formaldehyde (RF), Super-critical drying (SCD),
Event Title:Online Seminar on Aerogels – 2020
Event Location:Hamburg, Germany
Event Type:international Conference
Event Dates:16.-18 September 2020
Organizer:Prof. Irina Smirnova, Hamburg University of Technology – Harburg, Germany.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr (old), V - NGC Fahrzeugstruktur II (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Kamal Mohamed, Seeni Meera
Deposited On:19 Oct 2020 10:00
Last Modified:26 Oct 2020 18:06

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.