Next Article in Journal
Removal of Lead by Oxidized Graphite
Next Article in Special Issue
A New Composite Material on the Base of Carbon Nanotubes and Boron Clusters B12 as the Base for High-Performance Supercapacitor Electrodes
Previous Article in Journal
A Comparative Study of Aromatization Catalysts: The Advantage of Hybrid Oxy/Carbides and Platinum-Catalysts Based on Carbon Gels
Previous Article in Special Issue
Fullerene Polymers: A Brief Review
Open AccessFeature PaperArticle

Anisotropic Magnetism in Gradient Porous Carbon Composite Aerogels

1
Department of Chemistry, Universität Konstanz, Universitätsstrasse 10, 78547 Konstanz, Germany
2
Institute of Inorganic Chemistry, Leibniz-University Hannover, Callinstrasse 9, 30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jean-François Morin
Received: 27 January 2021 / Revised: 5 February 2021 / Accepted: 10 February 2021 / Published: 13 February 2021
(This article belongs to the Special Issue Carbon-Rich Compounds: From Molecules to Materials)
Porosity is of high importance for functional materials, as it allows for high surface areas and the accessibility of materials. While the fundamental interplay between different pore sizes and functionalities is quite well understood, few studies on gradually changing properties in a material exist. To date, only a few examples of such materials have been synthesized successfully. Herein, we present a facile method for synthesizing macroscopic carbon aerogels with locally changing pore sizes and functionalities. We used ultracentrifugation to fractionate differently functionalized and sized polystyrene nanoparticles. The assembly into gradient templates was conducted in a resorcinol–formaldehyde (RF) sol, which acted as a liquid phase and carbon precursor. We show that the modification of nanoparticles and a sol–gel precursor is a powerful tool for introducing dopants (sulfur and phosphorous) and metal nanoparticles (e.g., Ni) into gradient porous carbons formed during the carbonization of the RF sol. Understanding the underlying interactions between particles and precursors will lead to a plethora of possibilities in the material design of complex functionally graded materials. We showed this by exchanging parts of the template with magnetite–polystyrene composites as templating nanoparticles. This led to the incorporation of magnetite nanoparticles in the formed gradient porous carbon aerogels. Finally, gradually increasing concentrations of magnetite were obtained, ultimately leading to macroscopic carbon aerogels with locally changing magnetic properties, while the graded porosity was maintained. View Full-Text
Keywords: hierarchical porosity; aerogel; functional gradient material; graded porosity; composite materials; magnetism; carbon; magnetite hierarchical porosity; aerogel; functional gradient material; graded porosity; composite materials; magnetism; carbon; magnetite
Show Figures

Graphical abstract

MDPI and ACS Style

Bahner, J.; Hug, N.; Polarz, S. Anisotropic Magnetism in Gradient Porous Carbon Composite Aerogels. C 2021, 7, 22. https://0-doi-org.brum.beds.ac.uk/10.3390/c7010022

AMA Style

Bahner J, Hug N, Polarz S. Anisotropic Magnetism in Gradient Porous Carbon Composite Aerogels. C. 2021; 7(1):22. https://0-doi-org.brum.beds.ac.uk/10.3390/c7010022

Chicago/Turabian Style

Bahner, Jochen; Hug, Nicolas; Polarz, Sebastian. 2021. "Anisotropic Magnetism in Gradient Porous Carbon Composite Aerogels" C 7, no. 1: 22. https://0-doi-org.brum.beds.ac.uk/10.3390/c7010022

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop