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Pyrolyzed macrocycle/carbon blends for advanced electrocatalysts

Description: Pyrolysis of metallated macrocycle compounds involves a vapor phase condensation to form a solid, condensation product that is carbonaceous and electronically conductive. Reaction of these vapors with hot carbon surfaces permits condensation on these surfaces that prepares active electrocatalytic carbons. The role of the metal ion in these processes is not clear, although the chelate clearly acts to carry the metal into the vapor phase. Rapid peroxide decomposition results only with the composi… more
Date: January 1, 1986
Creator: Vanderborgh, N.E. & Rieke, P.C.
Partner: UNT Libraries Government Documents Department
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An Electron Microscopy Study of the Microstructure and Microarchitecture of the Strombus Gigas Shell

Description: A scanning and transmission electron microscopy study is presented of the microstructure of the Strombus gigas shell. The hierarchical nature of this crossed-lamellar structure and the defect content of the mineral component are described. The mineral component consists of small single crystal grains of aragonite, the metastable orthorhombic polymorph of CaCO{sub 3}. The habit and morphology of the grains discussed here have not been determined previously. The observed habit and defect structur… more
Date: November 1, 1989
Creator: Rieke, P. C.; Laraia, V. J.; Heuer, A. H. & Aindow, M.
Partner: UNT Libraries Government Documents Department
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The nucleation and growth of calcium oxalate monohydrate on self- assembled monolayers (SAMs)

Description: A physical chemical approach was used to study calcium oxalate monohydrate (COM) nucleation and growth on various organic interfaces. Self-assembling monolayers (SAMs), containing derivatized organic functional groups, were designed to mimic various amino acid residues present in both urine and stone matrix macromolecules. Derivatized surfaces include SAMs with terminal methyl, bromo, imidazole, and thiazolidine-carboxylic acid functional groups. Pronounced differences in COM deposition were ob… more
Date: May 1, 1992
Creator: Campbell, A. A.; Tarasevich, B. J.; Graff, G. L.; Fryxell, G. E. & Rieke, P. C.
Partner: UNT Libraries Government Documents Department
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Synthetic surfaces as models for biomineralization substrates

Description: Polyethylene and oxide substrates were derivatized with functional groups commonly associated with biomineralization substrates. These groups include carboxylate, phosphate, hydroxy, sulfonate, thiol, and amine. Fourier transform infrared spectroscopy and contact angle wetting were used to identify and characterize the products at each step. The efficacy of these groups toward inducing mineralization will be compared with naturally occurring substrates. 10 refs., 5 figs.
Date: January 1, 1990
Creator: Rieke, P.C.; Tarasevich, B.J.; Bentjen, S.B.; Autrey, T.S. & Nelson, D.A.
Partner: UNT Libraries Government Documents Department
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Biomimetic thin film deposition

Description: Biological mineral deposition for the formation of bone, mollusk shell and other hard tissues provides materials scientists with illustrative materials processing strategies. This presentation will review the key features of biomineralization and how these features can be of technical importance. We have adapted existing knowledge of biomineralization to develop a unique method of depositing inorganic thin films and coating. Our approach to thin film deposition is to modify substrate surfaces t… more
Date: September 1, 1995
Creator: Rieke, P. C.; Graff, G. E.; Campbell, A. A.; Bunker, B. C.; Baskaran, S.; Song, L. et al.
Partner: UNT Libraries Government Documents Department
open access

Biomimetic lithography and deposition kinetics of iron oxyhydroxide thin films

Description: Heterogeneous nucleation and crystal growth on functionalized organic substrates is a critical step in biological hard tissue formation. Self assembled monolayers can be derivatized with various organic functional groups to mimic the ``nucleation proteins`` for induction of mineral growth. Studies of nucleation and growth on SAMs can provide a better understanding of biomineralization and can also form the basis of a superior thin film deposition process. We demonstrate that micron-scale, elect… more
Date: December 1, 1993
Creator: Rieke, P. C.; Wood, L. L.; Marsh, B. M.; Fryxell, G. E.; Engelhard, M. H.; Baer, D. R. et al.
Partner: UNT Libraries Government Documents Department
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