Thermogravimetric Measurement of Hydrogen Absorption in Alkali-Modified Carbon Materials

Article Abstract:

Li-doped multiwall carbon nanotubes and Li- and K-interacted graphite is prepared and their hydrogen storage properties using a thermogravimetric analyzer (TGA) are measured. A cyclable weight gain between 200 and 400 degree C and weight loss between 400 and 500 degree C characterized by a distinct and unusual temperature profile in a flowing H2 atmosphere Li-doped nanotubes and Li-intercalated graphite is exhibited.

Lithium Compounds, Carbon, Chemical properties

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Electronic transitions of the Soret band of reaction centers from Rhodobacter sphaeroides studied by fematosecond transient absorbance spectroscopy

Article Abstract:

The Soret band of reaction centers form Rhodobacter sphaeroides was systematically studied using fematosecond transient absorption spectroscopy. It was found that the main contribution of absorption spectra H is on the blue end of spectrum, P absorbs mostly on the red side of spectrum, but probably has multiple bands and the main absorbance of B likely lies between H and P, overlapping with P on the red side.

Spectra, Absorption spectra, Phosphorus compounds, Structure

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Temperature dependence of the free energy, ethaloy, and entropy of P(super +)Q(sub A)(super -) charge recombination in Rhodobacter sphaeroides R-26 reaction centers

Article Abstract:

The free energy, entropy, and enthalpy changes between P(super +)Q(sub A)(super -) and P(super +)H(super -) were determined for eight anthraquinones and one naphthoquinone as Q(sub A). The temperature dependence of the charge recombination kinetics is studied at temperature from 40 to 318 K.

Elemental Phosphorus, Phosphorus, Entropy (Physics), Entropy (Thermodynamics)

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