Research at FSU 2004-2015
A Metal Organic Framework research with Naresh Dalal and Tony Cheetham
Margaret with Naresh
B FT ICR MS Cluster Beam Experiments with Alan Marshall’s group at the NHMFL at FSU
A series of FT ICR MS cluster Beam experiments have been carried out at the FSU Maglab with Alan Marshall. The experiments have been carried out by Paul Dunk and the results of a typical study are shown here. In this experiment the small endohedral fullerene T@C28 has been studied and it has been shown that the C 28 species is tetravalent as it readily encapsulates Ti which is attached the relevant element. C28 also readily encapsulates zirconium and uranium.
These experiments exploit the phenomenal resolution achievable by the FT ICR MS techniques developed by Alan Marshall at the National High Magnetic Field Laboratory at FSU.
An overview of these experiments is given here FT ICR MS Cluster Beam Experiments
C Nanoscience and Nanotechnology Research with Steve Acquah
My (S.A) primary research focus now is on developing strategies to successfully cross-link carbon nanotube. I wrote a book chapter addressing this problem referencing methods of cross-linking by other researchers. I investigated the cross-linking amino acid side chains and applied some the methodology to carbon nanotubes by using thiol modified multi-walled carbon nanotubes (MWCNT-SH) and benzoquinone. This proved to be a successful way to not only cross-link the carbon nanotubes to form a conductive paper-like material, but also extend the utility of these papers with the addition of nanoparticles. I developed a new method of cross-linking during filtration.
Hydrogen Sensing Paper
A significant milestone was the incorporation of Palladium nanoparticles to carbon nanotube paper. Palladium is a cheaper alternative to Platinum which is used in many catalytic systems. Unfortunately, the presence of sulfur can affect the catalytic properties of Palladium so I developed a method of cross-linking using aminated multi-walled carbon nanotubes (MWCNT-NH2) with Benzoquinone. During the assembly process I incorporated Palladium nanoparticles to form a hydrogen sensing carbon nanotube sheet. The results were published in the leading journal ‘Carbon’ and gained recognition as a feature in the science magazine ‘Chemistry & Industry’. [On Paper the Future is Rosy, Acquah S.F.A.*; Ventura D.N; Kroto H.W. Chemistry & Industry, 2011, 75, (22), 22-24]. The application of these results were extremely significant because it showed that a flexible hydrogen sensor could be created which may be integrated into the housings for hydrogen fuel cells in hydrogen powered vehicles. It would be able to detect hydrogen leaks at low hydrogen concentrations before it reaches an explosive level.
Piezoelectric Carbon Nanotube Paper
Wearable electronics will form the next generation of consumer devices. The demand in these devices requires new and innovative ways to power them when away from power outlets. Solar power devices are one popular approach to this but an alternative is to use pressure from movement to generate an electric potential in a material, I developed the first cross linked carbon nanotube paper with embedded Zinc Oxide nanoparticles that can be used to generate electricity when flexed. The results were published in the Journal Carbon.
Linkedin: Steve Acquah
Metal-Organic Organic Frameworks
Advances in the field of hybrid inorganic-organic frameworks, or MOFs, have been achieved in a research programme with Naresh Dalal and Prashant Jain at Florida State and Tony Cheetham (UCSB/Cambridge). It began with the aim of synthesising hybrid counterparts of magnetic-core memory. Magnetic-core memory was the predominant form of random-access computer memory for 20 years, from 1955-75. MOFs are hybrid crystalline materials comprised of inorganic and organic building blocks, as illustrated in figure 1. By varying both the building blocks and the synthesis conditions, an infinite number of such novel materials could be synthesized.
Prashant (then graduate student) began the research with the aim of creating a planar 2-D MOF materials to mimic iron-core memory. However, serendipitously, he synthesised a perovskite MOF which was disordered at the room temperature. Perovskite materials generally exhibit many interesting and intriguing properties: colossal magnetoresistance, ferroelectricity, superconductivity, charge ordering, spin dependent transport, high thermopower and the interplay of structural, magnetic and transport properties are commonly observed. Thus, this exciting discovery of hybrid perovskites led us to research Pb-free ferroelectrics and a new class of multiferroic materials as detailed below:
Naresh, Prashant and HK at the Black Dog…the best coffeehouse and place to develop ideas in Florida