Výsledky vyhledávání - "E. W. Sheppard"

Autor: P.T. Reischman, William S. Borghard, E. W. Sheppard

Publikováno v: Journal of Catalysis. 139:19-23

A new physisorption device collects accurate isotherm data at low pressures and low adsorptions. Thus, physisorption isotherms of microporous materials can he determined in fine detail in the region where the first sorbing atoms enter the unit cell o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0a56eb3f41c122e4f03b5253a88ea2a4
https://doi.org/10.1006/jcat.1993.1002

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An automated, high precision unit for low‐pressure physisorption

Autor: E. W. Sheppard, Hans J. Schoennagel, William S. Borghard

Publikováno v: Review of Scientific Instruments. 62:2801-2809

A physisorption apparatus with very high sensitivity has been constructed. It is capable of accurately measuring adsorption and desorption isotherms of gases on solids in the pressure range of 10−5–1000 Torr. This is particularly useful for inves

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e88538bba21589b7ba571fa7d5fb44c1
https://doi.org/10.1063/1.1142216

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Designed Synthesis of Mesoporous Molecular Sieve Systems Using Surfactant-Directing Agents

Autor: Charles T. Kresge, J.D. Lutner, James C. Vartuli, J.S. Beck, Kirk D. Schmitt, E. W. Sheppard, S.B. McCullen, W.J. Roth, M. E. Leonowicz

The use of cationic surfactants as structure directing agents has resulted in the discovery of M41S, the first, ordered mesoporous molecular sieves. Herein we describe the ability of the surfactant molecules to interact with silicate counterions resu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::92caf10338cfb29899f415a4739e13ce
https://doi.org/10.1016/b978-012508460-4/50002-4

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Development of a formation mechanism for M41S materials

Autor: M. E. Leonowicz, J.S. Beck, S.B. McCullen, J. L. Schlenker, S.D. Hellring, Kirk D. Schmitt, D.H. Olson, E. W. Sheppard, C.T. Kresge, James C. Vartuli, W.J. Roth

1. Summary The influence of surfactant/silica molar ratio(Sur/Si) in M41S syntheses was studied in the simple synthesis system consisting of tetraethylorthosilicate(TEOS), water, and the cetyltrimethylammonium(CTMA) cation at 100°C. As the Sur/Si in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9b85a09030ea20801f4a930ea4b6ed81
https://doi.org/10.1016/s0167-2991(08)64096-3

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Conformation and shear stability of xanthan gum in solution

Autor: Catherine S. Hsia Chen, E. W. Sheppard

Publikováno v: Polymer Engineering and Science. 20:512-516

Xanthan gum, the extracellular polysacchuride produced by the microorganism Xanthomonas campestris has unique rheological properties and as a result found many industrial uses. The primary structure o xanthan consists of a cellulose backbone substitu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::74b6a7e3a1ce821db534f6b9dfbf5f8b
https://doi.org/10.1002/pen.760200712

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Conformation and Hydrolytic Stability of Polysaccharide fromXanthomonas campestris

Autor: Catherine S. Hsia Chen, E. W. Sheppard

Publikováno v: Journal of Macromolecular Science: Part A - Chemistry. 13:239-259

Xanthomonas campestris polysaccharide in the solid state is stable to 225°C in air and 250°C in inert atmosphere. In solution, even at moderate temperatures, the polymer undergoes hydrolytic degradation via the glycosidic linkages, and occurrence o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::51ba1928c1730ae4473f54fd00922c49
https://doi.org/10.1080/00222337908066600

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