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Chemical Engineering Commons™

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Materials Science and Engineering

Selected Works

Andrew C. Hillier

1994

Articles 1 - 3 of 3

Full-Text Articles in Chemical Engineering

Nucleation And Growth Of Molecular Crystals On Molecular Interfaces Role Of Chemical Functionality And Topography, Phillip W. Carter, Lynn M. Frostman, Andrew C. Hillier, Michael D. Ward Jun 1994

Nucleation And Growth Of Molecular Crystals On Molecular Interfaces Role Of Chemical Functionality And Topography, Phillip W. Carter, Lynn M. Frostman, Andrew C. Hillier, Michael D. Ward

Andrew C. Hillier

The nucleation and growth of molecular crystals at interfaces has been investigated in the context of nucleation rates, growth orientation, nanoscale growth modes, and the influence of topographic features on growth characteristics. For instance, real time imaging of crystal growth in solution using the atomic force microscope (AFM) reveals that the nanoscopic surface topography and molecular structure of the crystal-solution interface play an important role in the growth and dissolution characteristics of molecular crystals. This influence can be understood in terms of the strength and orientation of intermolecular bonding at the crystal-solution interfaces. Additionally, the well- defined structure exposed on …

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Nanoscale Surface Topography And Growth Of Molecular Crystals: The Role Of Anisotropic Intermolecular Bonding, Phillip W. Carter, Andrew C. Hillier, Michael D. Ward Dec 1993

Nanoscale Surface Topography And Growth Of Molecular Crystals: The Role Of Anisotropic Intermolecular Bonding, Phillip W. Carter, Andrew C. Hillier, Michael D. Ward

Andrew C. Hillier

Atomic force microscopy (AFM) and phase measurement interferometric microscopy (PMIM) of the molecular crystals a-glycine and (TMTSF)2C104 (TMTSF = tetramethyltetraselenafulvalene) reveal that crystal topography, growth, and etching reflect the relative strengths of solid state intermolecular bonding. The (OlO), (110), and (01 1) faces of a-glycine exhibit terraces, ledges, and kinks that can be interpreted on the basis of intermolecular hydrogen bonding in these planes. A strong preference for [ 1001 ledges on the (001) face of (TMTSF)zC104 is a consequence of strong intermolecular charge transfer interactions between TMTSF molecules stacked along this direction. Dynamic in situ measurements of growth and …

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Electrocrystallization Of An Ordered Organic Monolayer: Selective Epitaxial Growth Of B-(Et)213 On Graphite, Andrew C. Hillier, Jeffrey B. Maxson, Michael D. Ward Dec 1993

Electrocrystallization Of An Ordered Organic Monolayer: Selective Epitaxial Growth Of B-(Et)213 On Graphite, Andrew C. Hillier, Jeffrey B. Maxson, Michael D. Ward

Andrew C. Hillier

The fabrication of highly ordered organic thin films has received considerable attention in attempts to develop materials for molecular-based electronic devices, sensors, displays, and logic e1ements.l Examples of twodimensional films with potentially desirable electronic properties include self-assembled mono- and multilayers with redox-active components2 and thin films of organic dyes grown by molecular beam epitaxy on van der Waals substrates such as graphite, MoS2, and SnSza3 Successful approaches to the manufacturing of devices based on organic thin films will ultimately rely on the development of convenient fabrication methods as well as rigorous control of the supramolecular structure of the thin-film assembly.

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