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An inexpensive resonant photoacoustic spectrometer based on a low-power distributed feedback diode laser and wavelength modulation spectroscopy is developed. This sensor has been applied to the detection of acetylene (C 2 H 2 ) using a properly designed photoacoustic cell operating on its second...
A new technique of synthesizing single-walled carbon nanotubes (SWCNTs) has been developed by means of the catalytic chemical vapor deposition (CVD) method from ethanol over MgO supported catalyst using fluidized-bed. Ethanol vapor was introduced into the fluidized-bed from a...
Raman spectroscopy has been used to study the molecular structure of a series of selected uranyl silicate minerals, including weeksite K 2 ((UO 2 ) 2 (Si 5 O 13 ))·H 2 O, soddyite ((UO 2 ) 2 SiO 4 ·2H 2 O) and haiweeite Ca((UO 2 ) 2 (Si 5 O 12 (OH) 2 )(H 2 O) 3 with UO 2 2+ /SiO 2 molar ratio...
Intrinsic fluorescence, in particular, has the advantage over the extrinsic fluorescence of an unperturbed environment during investigation, especially in complex systems such as biological cells and tissues. Potassium iodate may restrain bacteria growth as well as it acts as an additive in the...
In order to develop a rapid and effective analysis method for studying integrally the main constituents in the medicinal materials and their extracts, discriminating the extracts from different extraction process, comparing the categories of chemical constituents in the different extracts and...
1 H– 15 N 2D NMR data for S -allyl- l -cysteine (deoxyalliin) and for bis( S -allyl- l -cysteinate)palladium(II) complex are presented in this manuscript. Large upfield 15 N NMR shift of the amine nitrogen in the spectrum of the complex when compared to the spectrum of the ligand shows clearly...
The visible spectra of Safranine T (ST) in micellar solution of Brij 58, Tween 20 and Tween 40 and mixed micellar solution of Brij 58/Tween 20 and Brij 58/Tween 40 indicate formation of 1:1 charge transfer (CT) complex between acceptor ST and donor nonionic micelles and mixed micelles. The...
The proton transfer reaction and the spectroscopic properties of di-(2-hydroxy-3-formyl-5-tert butyl phenyl) methane (HFPM) have been examined in different nonpolar and polar solvents at room temperature and 77 K, by means of absorption, emission and time resolved fluorescence spectroscopy. In...
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