Search

Your search keyword '"Giorgi, Javier B."' showing total 9 results
Start Over Author "Giorgi, Javier B." Publisher american chemical society
9 results on '"Giorgi, Javier B."'

1. Model catalyst study on vanadia particles deposited onto a thin-film alumina support. 2. Interaction with carbon monoxide

Author

Magg, Norbert, Giorgi, Javier B., Hammoudeh, Ayman, Schroeder, Thomas, Baumer, Marcus, and Freund, Hans-Joachim

Subjects
Carbon monoxide -- Research, Carbon monoxide -- Optical properties, Carbon monoxide -- Chemical properties, Infrared spectroscopy -- Usage, Chemistry, Physical and theoretical -- Research, Chemicals, plastics and rubber industries
Abstract

The infrared spectroscopy (IR) is utilized to study the interaction of CO molecules with a model catalyst system formed by alumina-supported vanadia particles. Low -energy electrons that are supplied either by an electron gun or by exposing the sample to X-rays could induce an oxidation reaction.

Published
2003

2. Model catalyst studies on vanadia particles deposited onto a thin-film alumina support. 1. structural characterization

Author

Magg, Norbert, Giorgi, Javier B., Schroeder, Thomas, Baumer, Marcus, and Freund, Hans-Joachim

Subjects
Catalysts -- Research, Catalysts -- Atomic properties, Vanadium -- Research, Vanadium -- Atomic properties, Chemicals, plastics and rubber industries
Abstract

A model system of alumina-supported vanadia particles, representing catalysts of the type oxide1/oxide2, is prepared under ultrahigh vacuum (UHV) conditions. The results show that the particles interact strongly with the alumina support.

Published
2002

3. Ester cleavage by cyclodextrins in aqueous dimethyl sulfoxide mixtures. Substrate binding versus transition state binding

Author

Tee, Oswald S., Mazza, Charles, Lozano-Hemmer, Rafael, and Giorgi, Javier B.

Subjects
Scission (Chemistry) -- Research, Esters -- Research, Cyclodextrins -- Research, Biological sciences, Chemistry
Abstract

Kinetic studies of the influence of aqueous dimethyl sulfoxide (DMSO) on the cleavage of m- and p-nitrophenyl alkanoates (mNPAlk and pNPAlk) by alpha- and beta-cyclodextrin (CD) reveal that the rate of cleavage is increased by the addition upto 60% (v/v) of DMSO, while DMSO exerts little influence on transition state binding and substrate binding. Aryl group inclusion occurs in the cleavage of mNPAlk, while pNPAlk cleavage proceeds through acyl group inclusion. Change of solvent from water to DMSO induces more weakening in the substrate binding compared to transition state binding, leading to an increase in the cleavage rate of m-tert-butylphenylacetate.

Published
1994

4. Alumina-supported vanadium nanoparticles: structural characterization and CO adsorption properties

Author

Magg, Norbert, Giorgi, Javier B., Frank, Martin M., Immaraporn, Boonchuan, Schroeder, Thomas, Baumer, Marcus, and Freund, Hans-Joachim

Subjects
Adsorption -- Research, Carbon monoxide -- Research, Carbon monoxide -- Properties, Chemistry
Abstract

Under ultrahigh vacuum (UHV) conditions, alumina-supported vanadium particles were prepared and characterized with respect to their structural and CO adsorption properties. As a result, a charge-frequency relationship is set up which allows to quantify the extent of charge transfer from vanadium to alumina.

Published
2004

8. Cooperative behavior by two different cyclodextrins in a reaction: Evidence of bimodal...

Author

Giorgi, Javier B. and Tee, Oswald S.

Subjects
*CYCLODEXTRINS, *REACTIVITY (Chemistry)
Abstract

Presents results for an ester cleavage by two different cyclodextrins (CDs) whose combined effect exceeds the sum of their individual effects. Earlier work on cleavage of aryl alkanoates by CDs as guide; Mechanism of cleavage process; Kinetic studies of the cleavage reaction.

Published
1995
Full Text
View/download PDF

9. Pattern formation of antifreeze glycoproteins via solvent evaporation.

Author

Younes-Metzler O, Ben RN, and Giorgi JB

Subjects
Animals, Antarctic Regions, Antifreeze Proteins ultrastructure, Arctic Regions, Fishes, Microscopy, Atomic Force, Solutions chemistry, Volatilization, Water chemistry, Antifreeze Proteins chemistry, Solvents chemistry
Abstract

Surface patterning of antifreeze glycoprotein fraction 8 (AFGP 8) via a solvent evaporation method is reported here. In this process, lines of AFGP 8 particles and gridlike patterns were formed as as result of the receding of the droplet contact line and the accumulation of the solute during evaporation. The solution concentration strongly affects the protein line spacing. The average height of the protein was measured to be 8.1 +/- 2.5 A, which may be attributed to the height of a single molecule.

Published
2007
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results