Seminar on Nanomaterials

Recently (Aug 1st 2010) BUET has organized a seminar on Nanotechnology. Dr. Navid Saleh, Assistant Professor of Civil and Environmental Engineering at the University of South Carolina, gave a talk on the ‘Applications and Implications of Nanotechnology’. The seminar, held ITN Centre at Civil Bldg (BUET), was open for the faculties and students. In his speech Dr. Saleh addressed how the nanotechnology and nanomaterials can be applied to solve environmental and health problems. The seminar was followed by a lively discussion session with audience.

Presentation Abstract

Applications and Implications of Nanomaterials

Nanotechnology and molecular manufacturing allows for manipulation of material size and composition. This expands the promise of application of nanomaterials in addressing environmental problems, but also has the potential for adversely impacting the natural environment and human health. The primary focus is to use nanomaterials for environmental remediation and to study the impact of the release of such materials in the environment. The first part of this talk will focus on the aggregation behavior of carbon nanotubes (CNTs) in environmentally relevant solution chemistries. The MWNTs were thoroughly characterized using Raman scattering (for state of defect), total gravimetric analysis (for metal impurities), transmission electron microscopy (for length and diameter distribution), Fourier transformed infrared spectroscopy (for functional groups), and electrophoretic mobility (for surface charge). The aggregation kinetics of MWNTs was consistent with classical DLVO theory of colloidal stability in presence of Na, Ca, and Mg salts. Humic acid effectively stabilized the MWNTs by steric interactions. The second part will demonstrate the use of surface-modified nano-scale zero-valent iron (NZVI) for remediation of dense non-aqueous-phase liquid (DNAPL). Surface modification using novel block-copolymer and surfactants enhanced transport through porous media. Amphiphilic block copolymer modification helped the NZVI to localize at DNAPL/water interface. The concluding part of the talk will focus on my research interests that include studying the effect of functionalization on CNT aggregation and deposition behavior, development of nano-sensors for microbial mapping of the subsurface, and toxicity of CNTs to microbes.
 

 

To cite this article, please use following information:

(use the given format or any standard citation format)

Khan, I.A., Applications and Implications of Nanomaterials, ChE Thoughts 1 (1), 30, 2010.

 

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