Multiscale Modeling of Interfacial Environments around Carbon Nanotubes

RAP opportunity at National Institute of Standards and Technology     NIST

Multiscale Modeling of Interfacial Environments around Carbon Nanotubes

Location

Material Measurement Laboratory, Materials Science and Engineering Division

opportunity location
50.64.21.B7809 Gaithersburg, MD

NIST only participates in the February and August reviews.

Advisers
name email phone
Jeffrey Alan Fagan jeffrey.fagan@nist.gov 301.975.6740
Frederick R. Phelan frederick.phelan@nist.gov 301.975.6761
Daniel William Siderius daniel.siderius@nist.gov 301.975.5968
Description

Interactions of nanoparticles with their local environment are strongly modulated by any interfacial layer coating the nanoparticle. In particular for carbon nanotubes, which are comprised entirely of surface atoms, the interfacial layer often dominantly controls the interactions of and between nanotubes dispersed for processing in liquid media. A key example of this is that liquid phase separation techniques rely on modulating these interactions using mixtures of interfacially adsorbing surfactants to extract nanotubes of different species, chiral angle, metalicity, or enatiomeric structure. Although specific mixtures of adsorbing molecules and experimental conditions have been identified that allow for heuristic design of separations, the connections between the chemistry and structure of adsorbing molecules and the resulting interfacial layer and its attributes are poorly understood. In this opportunity, we seek to perform simulations of nanotubes in solution with the ultimate goal of more fundamentally understanding the physicochemical and thermophysical properties of the interfacial layer on nanotubes in solution. This will involve evaluation of the interactions between a nanotube and the project examples include simulations of systems that incorporate ion distributions both inside and outside the nanotube surface, examination of the specific effects of chemical structure on the adsorption of molecules to the nanotube surface and its effect on solubility, and course-grained simulations of nanotubes with large adsorbed dispersant molecules in solution. It is expected that the challenging nature of these simulations will require the development of novel simulation techniques. In addition, simulations and examination of the overall separation process may require computational studies across multiple length scales.

key words

Modeling; Nanotube; Molecular simulation; Interface; Coarse-grain; Thermodynamics; Computational chemistry; Nanotechnology; Statistical mechanics;

Eligibility

Citizenship:  Open to U.S. citizens

Level:  Open to Postdoctoral applicants

Stipend
Base Stipend Travel Allotment Supplementation
$82,764.00 $3,000.00