S. J. Gregg, K. S. W. Sing: <i>Adsorption, Surface Area and Porosity</i>. 2. Auflage, Academic Press, London 1982. 303 Seiten, Preis: $ 49.50

Haul, R.

doi:10.1002/bbpc.19820861019

Cited by 110 publications

(73 citation statements)

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“…The BET surface area of the fresh Indion 130 resin catalyst was 19 m 2 /g. [16] The pore volume and pore diameter were, 0.39 cm 3 /g and 295 Å, respectively. The concentration of acidic sites in Indion 130 resin catalyst, as determined by acid-base titration, was 4.8 meq/gm.…”

Section: Resultsmentioning

confidence: 96%

Solvent-free esterification of stearic acid and ethylene glycol with heterogeneous catalysis in a stirred batch microwave reactor

Hiware

Gaikar

2020

SN Appl. Sci.

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Ethylene glycol distearate (EGDS) is extensively used in the pharmaceutical and cosmetics industries. Even in textile industries as a softener, EGDS is in demand. In this paper, synthesis of EGDS by esterification of ethylene glycol and stearic acid has been described using a solid acid catalyst under microwave (MW) irradiation in a solvent-free system. Conventional heating takes more than 4-6 h to give a mixture of EGDS and ethylene glycol monostearate (EGMS). Under MW irradiation, the highest conversion of 97% of the acid was obtained in 10 min. The reaction mixture was analyzed by acid value, FT-IR, 1 H-NMR and mass spectroscopy. The EGDS synthesis was optimized concerning various parameters such as reaction time, different catalysts, catalyst loading (wt/wt%), temperature, and MW power. Heterogeneous catalysis, intensified with MW irradiation, makes the esterification process more promising route for possible application at industrial scale. Graphic abstractElectronic supplementary material The online version of this article (https ://doi.

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Section: Resultsmentioning

confidence: 96%

Solvent-free esterification of stearic acid and ethylene glycol with heterogeneous catalysis in a stirred batch microwave reactor

Hiware

Gaikar

2020

SN Appl. Sci.

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“…In case these values are greater than 2, the isotherms fall into type IV. 13 On the other hand, the hysteresis loops resemble the H3 type in the IUPAC classification. This hysteresis pattern can be attributed to the crystalline agglomerates that result in the mesoporous structure formed by the interparticle space that causes the formation of secondary pores.…”

Section: Resultsmentioning

confidence: 98%

Investigation of Antibacterial Activity of Waste Lignocellulosic Materials Doped With Silver

MEHANDJIEV¹,

Angelova²,

Vassileva³

et al. 2019

Cellulose Chem. Technol.

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The antibacterial activity of samples prepared from waste lignocellulosic materials, namely wheat straw and maize stalks, doped with silver on their surface, was investigated. In order to use the various functional groups of these materials, Ag + was applied to the carrier by the adsorption method. EPR and SEM investigations demonstrated that Ag + ions were agglomerated into clusters of elemental silver on the carrier. The samples thus produced exhibited high antibacterial activity against gram-positive Bacillus subtilis strain 3563 and gram-negative Escherichia coli K12.

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“…BET analysis (Table ) showed increase in the surface area of the sample with increase in the Al content. The BET isotherm plots (Figure ) showed type IV irreversible isotherms and hysteresis during absorption‐desorption, resulting from capillary condensation in a nanoscale cavity at pressure lower than the saturation pressure . The results suggested interconnected pores structure, and the surface porosity of the samples changed from macroporous to mesoporous with increase in the Al content.…”

Section: Resultsmentioning

confidence: 98%

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

et al. 2019

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Suppression of charge recombination by thin amorphous alumina layers on metal oxide semiconductors has demonstrated a vital role in electronic appliances beside its role as an insulator. This study reports effect of amorphous alumina (Al2O3) on the structural, electrical, and optical properties of stannous oxide (SnO2). The samples for the present study are prepared as nanofibers by electrospinning a polymeric solution containing aluminum and stannous precursors and subsequent annealing; six samples with varying concentrations of aluminum and stannous are considered. A crystal‐amorphous SnO2/Al2O3 hybrid system was confirmed by both XRD and XPS analysis. Both BET and Mott‐Schottky analysis showed increase in the surface area and conduction band minimum of the sample with increase in the Al content, however, at the expense of its electrical conductivity. The electron lifetime of the sample increased with increase in the Al content, but the electron transport time increase with decrease in the electrical conductivity of the sample. Both Urbach energy measurement and Stoke's shift showed generation of deeper trap state with increase in the Al content. Investigation on sample photovoltaic performance showed that the loss in electrical conductivity of the sample can be compensated by the improved surface area to a certain extent. Interestingly, a composite nanofiber containing equal molar fraction of aluminum and stannous showed orders of magnitude higher photocurrent despite its similar resistivity as that of pure alumina fibers, which is shown to originate from a Fermi energy gradient at the Al2O3/SnO2 interface.

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S. J. Gregg, K. S. W. Sing: Adsorption, Surface Area and Porosity. 2. Auflage, Academic Press, London 1982. 303 Seiten, Preis: $ 49.50

Cited by 110 publications

References 0 publications

Solvent-free esterification of stearic acid and ethylene glycol with heterogeneous catalysis in a stirred batch microwave reactor

Solvent-free esterification of stearic acid and ethylene glycol with heterogeneous catalysis in a stirred batch microwave reactor

Investigation of Antibacterial Activity of Waste Lignocellulosic Materials Doped With Silver

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

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