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

Preparation & Characterization of Resorcinol-Formaldehyde Aerogel Microparticles Using Emulsion-Gelation Method

Kamal Mohamed, Seeni Meera and Heinrich, Charlotte and Milow, Barbara (2021) Preparation & Characterization of Resorcinol-Formaldehyde Aerogel Microparticles Using Emulsion-Gelation Method. Advanced Technologies for the processing and characterization of nanostructured materials, 5-7 July, 2021, Cracow, Poland (Online).

[img] PDF - Only accessible within DLR
177kB

Abstract

Resorcinol-Formaldehyde (RF) aerogel is an important class of organic aerogels, which exhibits large surface area, low density and high pore volume and is also precursor for carbon aerogel. They find applications in electrodes, batteries, foundry industries, adsorbents, etc. However, since milling and grinding of monolithic aerogels to granules of specific size is nontrivial, the preparation of organic aerogels in the form of micro-particles is of great interest because of the easy fabrication, reduced process time and equipment costs, easy handling, etc. There are various methods available to prepare aerogel micro-particles such as dripping, jet-cutting, prilling by vibration, spray drying, emulsion-gelation method, and etc. In this work, RF aerogel mirco-particles were prepared by emulsion-gelation method. The aqueous RF sol was prepared by mixing appropriate quantities of resorcinol, formaldehyde, H2O and Na2CO3 with continuous stirring at room temperature. The molar ratios of R/F, R/C & R/W were maintained as 0.74, 200 & 0.044, respectively. RF sol was slowly added to the oil phase (Rapeseed oil) under stirring at 60 C in a water bath. The stirring was continued for 3h until cross-linked gel spheres were formed. Then, the suspension was kept in an oven at 60 C for curing. Further, the spheres were separated by filtration and washed several times with alcohol to exchange the water. The alcogel spheres were dried by super-critical and ambient drying methods. The dried RF particles were characterized using N2 adsorption isotherms, gas pycnometry and scanning electron microscopy. RF aerogel particles with a surface area of 284 m2/g, pore volume of 0.88 cm3/g, pore diameter of 11.09 nm and average particle diameter of 200 µm were produced. Further investigations are under progress to achieve reproducibility and scalability to the production of large quantities for foundry applications.

Item URL in elib:https://elib.dlr.de/143113/
Document Type:Conference or Workshop Item (Other)
Title:Preparation & Characterization of Resorcinol-Formaldehyde Aerogel Microparticles Using Emulsion-Gelation Method
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kamal Mohamed, Seeni Meeraseenimeera.kamalmohamed (at) dlr.dehttps://orcid.org/0000-0002-8812-1362
Heinrich, CharlotteCharlotte.Heinrich (at) dlr.dehttps://orcid.org/0000-0002-8970-9598
Milow, BarbaraBarbara.Milow (at) dlr.dehttps://orcid.org/0000-0002-6350-7728
Date:2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Aerogel, Resorcinol-Formaldehyde, Emulsion-Gelation, Micro-particles, Supercritical drying.
Event Title:Advanced Technologies for the processing and characterization of nanostructured materials
Event Location:Cracow, Poland (Online)
Event Type:Workshop
Event Dates:5-7 July, 2021
Organizer:Prof. Urszula Stachewicz, AGH University of Science and Technology, Cracow, Poland.
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, V - NGC Fahrzeugstruktur II
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Kamal Mohamed, Seeni Meera
Deposited On:23 Jul 2021 07:34
Last Modified:28 Apr 2022 09:30

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.