Browsing Department of Chemistry by Issue Date
Now showing items 1-20 of 161
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A photoelectron spectroscopic investigation of conducting polypyrolle-polyamide composite film
(Elsevier, 1995-04)X-ray photoelectron spectrum of the electrochemically prepared polypyrrole and polypyrrole-polyamide composite films exhibit an additional strong high binding energy peak at 402.0 eV corresponding to N+ moieties. Intensity ... -
HIGH-VOLTAGE OPTICAL-EMISSION IN BINARY GASEOUS-MIXTURES OF N-2
(Elsevier, 1995-04-01)Optical emission in 1:1 binary gaseous mixtures under high voltage displays a varying character depending on pressure, applied voltage polarity, and chemical nature of the mixture. Under negative polarity, in pure N-2 and ... -
Dating of Sea of Marmara sediments by a uniform mixing model
(Elsevier, 1996)The sedimentation rates and ‘t”Pb fluxes on sediment surfaces were measured in the north, northwestern and southwestern parts of the Sea of Marmara. Each core had varying thickness of constant 2’0Pb activity regions ... -
Pyrolysis Mass Spectrometric Analysis of styrene butadiene block and random copolymers
(Elsevier, 1997-02)Direct pyrolysis mass spectrometric analysis of a styrene-butadiene-styrene block copolymer indicated that thermal decomposition of each block shows a resemblance to the related homopolymer, giving a possibility of ... -
An investigation on the optimization of electrochemically pigmented aluminum oxide collector coatings
(Elsevier, 1997-03)In order to produce selective coatings on aluminium substrates to be used as absorber plates in high efficiency solar collectors, nickel pigmentation has been applied to anodically oxidized surfaces. Optical and structural ... -
Characterization of surfaces of various polymers by electron spectroscopy
(Elsevier, 1997-06-16)X-ray induced photo and Auger electron spectroscopic techniques have been used to characterize the surface composition of biaxially oriented polypropylene sheets with and without corona discharge treatment. The surfaces ... -
XPS and in-situ IR investigation of Ru/Si02 catalyst
(Elsevier, 1997-06-16)Ru(NO)(N0&/Si02 catalyst precursors were characterized via XPS and in-situ reflectance IR spectroscopy before, during and after reduction by hydrogen over the temperature range 300-800 K. IR results indicated that the ... -
Immobilization of invertase in conducting polymer matrices
(Elsevier, 1997-10)This paper reports a novel approach in the electrode immobilization of an enzyme, invertase, by electrochemical polymerization of pyrrole in the presence of enzyme. The polypyrrolelinvertase and polyamide/polypyrrole/invertase ... -
Polypyrrole grafts with poly[(methyl methacrylate)-CO-(2-(N-pyrrolyl)ethyl methacrylate)]
(Elsevier, 1997-10)Conducting polymer grafts of pyrrole and poly[(methyl methacrylate)-co-(2- (N-pyrrolyl) ethyl methacrylate)] containing 0.7% PEMA units were prepared by potentiostatic anodic polymerization of pyrrole in different ... -
Superradiant lasing from J-aggregated molecules adsorbed onto colloidal silver
(American Institute of Physics, 1998)The picosecond time-resolved emission spectrum of the cyanine dye 1,18-diethyl-3,38- bis-~3-sulfopropyl!-5,58,6,68-tetrachlorobenzimidazolocarbocyanine ~also known as BIC! adsorbed onto colloidal silver was examined as ... -
Spectroscopic characterization of Al2O3-Ni selective absorbers for solar collectors
(Elsevier, 1998-03-16)Optical spectroscopy of electrochemically prepared Ni-pigmented aluminum oxide selective absorbers have been determined in the 200—20000 nm range. It was found that samples anodized under the same conditions and pigmented ... -
Sorption Studies of Cs+ and Ba2+ Cations on Magnesite
(Elsevier, 1998-05-11)The adsorption behavior of Cs+ and Ba2+ cations on magnesite has been studied as a function of time, cation concentration and temperature, utilizing both the radiotracer method and X-ray photoelectron spectroscopy (XPS). ... -
XPS characterization of Co and Cr pigmented copper solar collectors
(Elsevier, 1999-01-01)XPS is used to characterize the chemical state of Co and Cr on the surfaces of electrochemically pigmented copper plates. Using both the measured 2p binding energies and the magnitude of the 3s multiplet splitting chemical ... -
Pyrolysis mass spectrometric analysis of styrene-isoprene-styrene copolymers
(Elsevier, 1999-05)Thermal analysis of styrene±isoprene±styrene block copolymer, using the direct pyrolysis mass spectrometry (MS) technique, indicated that each block showed very similar thermal behavior with the corresponding homopolymer. The ... -
FTIR characterization of Ru/SiO2 catalyst for ammonia synthesis
(Elsevier, 1999-05-04)Carbon monoxide adsorption on a Ru/SiO2 catalyst was followed by IR spectroscopy to investigate the active sites. Using this catalyst, ammonia synthesis was achieved at 3508C in an N2/H2 gas mixture (N2/H2 < 3 : 1) for ... -
UV-Vis, IR, and XPS analysis of UV induced changes in PVC composites
(Elsevier, 1999-05-25)PVC undergoes a high degree of dehydrochlorination when exposed to energetic photons. The released HCl (acid), however, can be trapped if a suitable trapping material (base) is also enclosed within the solid matrix as a ... -
XPS and FTIR characterization of manganese ions deposited on alumina
(Elsevier, 1999-05-25)By application of XPS and FTIR spectroscopy of adsorbed CO the effect of preparation conditions on the state and localization of manganese ions deposited on h-Al2O3 is studied. Both Mn21 and Mn31 ions are observed on the ... -
Platinum-palladium loaded polypyrrole film electrodes for the electrooxidation of D-glucose in neutral media
(Elsevier, 1999-11-01)Modified polymer films with metal particles incorporated into the films by electrodeposition are known as possible electrocatalysts for various electrode reactions such as fuel cell applications. This work presents some ... -
Time-related wettability characteristic of acrylic resin surfaces treated by glow discharge
(Elsevier, 1999-12)STATEMENT OF PROBLEM: Adhesion and cohesion have important roles in denture retention, and attempts have been made to improve the wettability of the acrylic resin material by surface treatments. PURPOSE: This study examined ... -
Spectroscopic investigation of species arising from CO chemisorption on titania-supported manganese
(Elsevier, 2000-02-15)The nature of manganese species on the surface of TiO2 (anatase) has been investigated by means of XPS, visible absorption spectroscopy, and FTIR spectroscopy of adsorbed CO. The catalysts were prepared by ion-exchange ...
