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Hydrogen Uptake (hydrogen + uptake)

Distribution by Scientific Domains

Polymers and Materials Science	50%
Chemistry	50%

Selected Abstracts

Freeze Drying Significantly Increases Permanent Porosity and Hydrogen Uptake in 4,4-Connected Metal,Organic Frameworks,

ANGEWANDTE CHEMIE, Issue 52 2009
Liqing Ma Dr.
Benzol ersetzt hochsiedende Lösungsmittel in den Kanälen eines Metall-organischen Gerüsts (MOF), wird eingefroren und durch Sublimation im Vakuum entfernt. Indem man die flüssige Phase vermeidet, werden nachteilige Effekte durch Oberflächenspannung umgangen, die zum Kollaps von Mesoporen führen können (siehe Schema). [source]

ChemInform Abstract: Ti-Substituted Boranes as Hydrogen Storage Materials: A Computational Quest for the Ideal Combination of Stable Electronic Structure and Optimal Hydrogen Uptake.

CHEMINFORM, Issue 34 2009
Cheng-Gen Zhang
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Microporous Metal,Organic Frameworks with High Gas Sorption and Separation Capacity,

ADVANCED FUNCTIONAL MATERIALS, Issue 8 2007
Y. Lee
Abstract The design, synthesis, and structural characterization of two microporous metal,organic framework structures, [M(bdc)(ted)0.5]·2,DMF·0.2,H2O (M,=,Zn (1), Cu (2); H2bdc,=,1,4-benzenedicarboxylic acid; ted,=,triethylenediamine; DMF: N,N -dimethylformamide) is reported. The pore characteristics and gas sorption properties of these compounds are investigated at cryogenic temperatures, room temperature, and higher temperatures by experimentally measuring argon, hydrogen, and selected hydrocarbon adsorption/desorption isotherms. These studies show that both compounds are highly porous with a pore volume of 0.65 (1) and 0.52,cm3,g,,1 (2). The amount of the hydrogen uptake, 2.1,wt,% (1) and 1.8,wt,% (2) at 77,K (1,atm; 1,atm,=,101,325,Pa), places them among the group of metal,organic frameworks (MOFs) having the highest H2 sorption capacity. [Zn(bdc)(ted)0.5]·2,DMF·0.2,H2O adsorbs a very large amount of hydrocarbons, including methanol, ethanol, dimethylether (DME), n -hexane, cyclohexane, and benzene, giving the highest sorption values among all metal,organic based porous materials reported to date. In addition, these materials hold great promise for gas separation. [source]

Corrosion monitoring of hydrogen by HUP probe in the presence of sulphide and thiourea

MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 2 2010
A. Abbassi
Abstract The effect of sulphide and thiourea on hydrogen uptake during the corrosion of steel in deaerated pH3 has been studied using an electrochemical hydrogen probe incorporating a solid electrolyte (HUP) and lead dioxide (PbO2) as a reference electrode. This probe has been used for the quantitative determination of the hydrogen activity generated during the corrosion of steel. The sensor voltage implies an average equivalent hydrogen pressure in uncharged steel of 2,×,10,18 atmospheres. During the corrosion of steel, this value increases by very large amounts; thus in deaerated pH3, the equivalent pressure rose by 1024.5 in the presence of 200 ppm sulphide and by 102 in the presence of 100 ppm thiourea. Weight loss and AC impedance methods were also performed under the same conditions as the hydrogen measurements. The hydrogen probe data were correlated with a.c impedance and weight loss results in order to understand the effect of S2, and thiourea on hydrogen uptake. [source]