William E. Carswell's research while affiliated with University of Alabama in Huntsville and other places

Publications (16)

Article
Thin films of an organic nonlinear optical (NLO) material, N, N-dimethyl-p-(2,2-dicyanovinyl) aniline (DCVA), have been grown in space and on the ground by physical vapor transport in an effusive ampoule arrangement. The thin film growth technique developed on the ground is a direct result of information gleaned from experiments in microgravity. Th...
Article
Thin films of an organic nonlinear optical (NLO) material, N, N-dimethyl-p-(2,2-dicyanovinyl) aniline (DCVA), have been grown in space and on the ground by physical vapor transport in an effusive ampoule arrangement. The thin film growth technique developed on the ground is a direct result of information gleaned from experiments in microgravity. Th...
Article
The Quench Module Insert (QMI) materials processing furnace is being designed to operate for 8000 hours over four years on the International Space Station (ISS) as part of the first Materials Science Research Rack (MSRR-1) of the Materials Science Research Facility (MSRF). The Bridgman-type furnace is being built for the directional solidification...
Chapter
A diffusive/kinetic rate equation was developed for the growth of polydiacetylene films from solution and compared with a microgravity experiment. The model takes into account both the kinetics of thin film growth and the diffusive transport limitations inherent to microgravity. In order to apply this model, measurements of the density and the ultr...
Article
This work is specifically focused on explaining previous results obtained for the crystal growth of an organic material in a reduced gravity environment. On STS-59, in April 1994, two experiments were conducted with N,N-dimethyl-p-(2,2-dicyanovinyl) aniline (DCVA), a promising nonlinear optical (NLO) material. The space experiments were set to repr...
Article
The Quench Module Insert is a directional solidification furnace that will operate in the Materials Science Research Rack (MSRR) on the International Space Station. It will provide high thermal gradient and quench capabilities for processing metals and alloys in microgravity. Numerical analyses and breadboard testing conducted to date show that the...
Article
Physical vapor transport (PVT) crystal growth experiments are being conducted with nonlinear optical organic materials in semi-closed ampoules which allow a vacuum to penetrate into the growth chamber, removing impurities and decomposition products from the growth interface. One material being grown is N,N-dimethyl-p-(2,2-dicyanovinyl) aniline (DCV...
Article
The growth kinetics of the polydiacetylene monomer (PDAMNA) films and the effects of convection on film growth and aggregate formation are investigated. Studies have been conducted using in-situ spectroscopic ellipsometry on the initial growth stages of the film. A space experiment was also conducted in which films were grown in the diffusion-limit...
Article
A diffusive/kinetic rate equation was developed for the growth of polydiacetylene films from solution and compared with a microgravity experiment. The model takes into account both the kinetics of thin film growth and the diffusive transport limitations inherent to microgravity. In order to apply this model, measurements of the density and the ultr...
Article
The Quench Module Insert (QMI) and the Diffusion Module Insert (DMI) are microgravity furnaces under development at Marshall Space Flight Center. The furnaces are being developed for the first Materials Science Research Rack (MSRR-1) of the Materials Science Research Facility (MSRF), one of the first International Space Station (ISS) scientific pay...
Article
In recent years, a great deal of interest has been directed toward the use of organic materials in the development of high-efficiency optoelectronic and photonic devices. There is a myriad of possibilities among organic materials, which allows flexibility in the design of unique structures with a variety of functional groups. The use of nonlinear o...
Article
Thin films of an organic nonlinear optical (NLO) material, N,N-dimethyl-p-(2,2-dicyanovinyl) aniline (DCVA), have been grown in space aboard the USA Space Shuttle Endeavour on STS (space transportation system) -59 and STS-69. Similar experiments have been conducted in the laboratory as ground controls and have produced single crystals only. In this...
Article
Organic thin films have been grown in space by effusive ampoule physical vapor transport technique with different growth parameters for the source temperature, transport flux, substrate, seeding, and backfilling. Results described in this paper are based on data from the two United States Space Shuttle Endeavour flights, STS (Space Transportation S...
Article
A moderate-temperature materials processing facility which uses very little power and is capable of operating on several different microgravity experiments carriers, including the Space Transportation System, the Space Station and the Commercial Experiment Transporter, COMET, is developed. Special design considerations allow the facility to operate...

Citations

... [1][2][3][4][5][6][7][8][9][10][11][12][13][14] The use of the physical vapor transport method to obtain organic single crystals has been increasing, [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and such crystals have been focused on for application in various types of device. [30][31][32][33] There are high expectations that the crystallographic high periodicity and ideal electronic structures of these crystals can be retained because most impurities can be excluded during crystal growth. Naphtacene, a chainlike aromatic molecule composed of four benzene rings, is a promising material for many device applications; however, few research studies of crystal quality have been performed so far. ...
... This year, the USM investigators have carried out pilot experiments on polymerization in microgravity [25]. Since it is impossible to cite the whole scope of bibliography on the problem in this brief review it will su ce to mention the other two interesting trends of research: processing of nonlinear organic materials (see, for example, [26]) and solidiÿcation of polymeric foam undertaken in 1989 [27]. ...