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Digitale Medien

An IR Spectroscopic Investigation of Nanostructured AlN and GaN Powder Surfaces (1999)

Baraton, M.-I. ; Gonsalves, K. E.

Springer

Journal of cluster science 10 (1999), S. 133-154

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ISSN: 1572-8862

Schlagwort(e): Aluminum nitride ; gallium nitride ; IR of surfaces

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract By combining the results of IR spectroscopy experiments, both in the transmission and diffuse reflectance modes, with data obtained by HRTEM, XRD and XPS an overall picture of AlN and GaN nanoparticle surface structures and functionality were deduced. The surface species from the IR data analysis indicated that the nanostructured AlN powder surfaces had acidic and weak basic sites in the form of Al3+ and Al3N−, respectively. Also present were -OH, -NH2, and -NH. For GaN, the bulk core of the particle had a zincblendel (FCC) structure with nitrogen vacancies, and the only functionality detected was Ga–H. The surface of the particles had a wurtzite(HCP) structure, with abundant NH and NH2 groups as well as OH and Ga3+ functionalities.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022660819473

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Digitale Medien

Synthesis of polyamides and polyureas containing leucine-tyrosine linkages (1997)

Jin, S. ; Mungara, P. M. ; Gonsalves, K. E.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 499-507

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ISSN: 0887-624X

Schlagwort(e): amino acids ; leucine-tyrosine ; polyureas ; polyamides ; polyesteramide ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Monomers with leucine-tyrosine linkages were synthesized using diphenyl phosphoryl azide as a coupling reagent. Leucyltyrosylpoly(propylene glycol) bis(2-aminopropyl ether) tyrosylleucine (monomer 1) has a longer spacer: poly(propylene glycol) bis(2-aminopropyl ether) (Jeffamine® D-400), and leucyltyrosyliminohexamethyleneiminotyrosylleucine (monomer 2) has a shorter spacer: hexamethylenediamine. Polyureas from monomers 1 and 2 with hexamethylene diisocyanate and methylenedi-p-phenyl diisocyanate were synthesized. Polyamide, polyesteramide from monomer 2 were synthesized. The characterization of these polymers using 1H-NMR, 13C-NMR, solid-state 13C-NMR, IR, GPC, and also thermal analysis are presented. © 1997 John Wiley & Sons, Inc.

Zusätzliches Material: 5 Ill.

Materialart: Digitale Medien

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