A'm a senior researcher, with expertize at laboratory, pilot and industrial scale, in in the field of dyes, pigments and smart materials. Phone: 0730617333 Address: Str. RASINARI, Nr.2, Bloc N9, Sc.C, Et2, Ap.39, Et.2, Ap.39, sector 3, Bucharest, Romania.
The paper presents the research carried out by our team on achieving amphiphilic polymeric microc... more The paper presents the research carried out by our team on achieving amphiphilic polymeric microcomposites, colored in ruby and violet shades for natural fibers dyeing (cotton, wool). The colored polymeric microcomposites were characterized in term of their morpholo- gical (by optical microscopy and SEM analysis) and physicochemical performancies (by FT-IR and UV-Vis spectroscopy, colorimetric analysis). The colored microcapsules were tested by studying the controlled release of the encapsulated dyes in water, to pH variation. This study was necessary to the coloristic characterization of colored polymeric microcomposites to determine the optimal microcapsules dye concentration and dyeing concentration of natural fibers.
DESCRIPTION This paper aims to explain the variation of UV-Vis spectral parameters of preformated... more DESCRIPTION This paper aims to explain the variation of UV-Vis spectral parameters of preformated acid azo chromium (1:1) complex dyes resulted from the same coupling component, having benzene-azo-pyrazolone type structures, versus spectral parameters of (1:1) chromium complex of the metallizable azo dye: 2-aminophenol → 1-(4’-sulphophenyl)-3-methyl-5-pyrazolone acid, considered as the reference structure. Were taken into account the electronic effects (σ, π) of substituent. The purity and the molecular structure of these compounds were verified by means of thin layer chromatography, chromium analysis as well by spectral study in IR and UV-Vis ranges.
II International Leather Engineering Congress Innovative Aspects for Leather Industry May 12-13, ... more II International Leather Engineering Congress Innovative Aspects for Leather Industry May 12-13, 2011, Izmir-TURKIYE COMPLEX CHROMOGEN SYSTEMS APPLIED ON LEATHER Mircea Ruse, Alexandrina Nuta, Anca Angela Athanasiu, Constantin Alifanti, Elena Ionita, Loti ...
This paper aims to explain the variation of (UV-Vis) spectral parameters of pre-formed azo chromi... more This paper aims to explain the variation of (UV-Vis) spectral parameters of pre-formed azo chromium (1:1) complex dyes, containing the sulfonic group in the diazotation component, having aryl-azo-pyrazolone and aryl-azo-naphtaline type structures, (aryl=benzene, naphtaline) versus spectral parameters of (1:1) chromium complex of azo dyes (A): 2-aminophenol-4-sulphonic acid → acetoacetanilide and (B): 1diazo-2-naphtol-4sulphonic acid ® acetoacetanilide, considered as reference structures, taking into account the electronic effects (σ, π) of substituents.
This paper presents an experimental investigation characterizing the use of fixed bed ion exchang... more This paper presents an experimental investigation characterizing the use of fixed bed ion exchange for simultaneous removal of 60Co and 137Cs radionuclides and of anionic surfactant sodium linear alkyl benzene sulphonate from waste waters resulted in processing of spent nuclear fuel. The first experimental studies were carried out with simulated, non-radioactive, water systems. The use of water radioactive waste as the case of spent decontamination solutions was also checked in experimental investigation. The treatment of radioactive solutions by ion exchange technique was carried at two flow rates and at 250C. Experimental results obtained in simulated non radioactive system using ion exchange resins Purolite NRW 5050 or mixture with Purolite NRW 160 and Purolite NRW 3550 have shown their effectiveness in decontamination of polluted water with cobalt ions and anionic surfactant. In the tests with radioactive system the ion exchanger Purolite 1600 can be effectively used to achieve ...
Industrial & Engineering Chemistry Research, 2004
Nanoscale, high surface area cerium oxide (ceria) powders and stable, high-concentration (>1 M... more Nanoscale, high surface area cerium oxide (ceria) powders and stable, high-concentration (>1 M) ceria sols were prepared by a new method based on homogeneous precipitation in an acidic environment using cerium(IV) nitrate as the precursor. The results are compared with ceria powders and sols prepared by a hydrothermal method in a basic environment with cerium(III) nitrate as the precursor. Hydrolysis and condensation of the cerium(IV) and cerium(III) nitrates yield the ceria precursor precipitates with molecular formula of CeO2·2H2O [or Ce(OH)4] and CeO2·H2O [or Ce(OH)2O], respectively. The dried ceria precursor powders from Ce(IV) and Ce(III) are well dispersed in the form of primary particles of about 4 nm in size. Calcination at 450 °C causes phase transformation of the amorphous portion accompanying growth of the Ce(IV)-derived ceria crystallite or aggregation of the Ce(III)-derived ceria particles. The Ce(III)-derived ceria crystallites have a smaller lattice parameter than the Ce(IV)-derived sample ...
The paper presents the research carried out by our team on achieving amphiphilic polymeric microc... more The paper presents the research carried out by our team on achieving amphiphilic polymeric microcomposites, colored in ruby and violet shades for natural fibers dyeing (cotton, wool). The colored polymeric microcomposites were characterized in term of their morpholo- gical (by optical microscopy and SEM analysis) and physicochemical performancies (by FT-IR and UV-Vis spectroscopy, colorimetric analysis). The colored microcapsules were tested by studying the controlled release of the encapsulated dyes in water, to pH variation. This study was necessary to the coloristic characterization of colored polymeric microcomposites to determine the optimal microcapsules dye concentration and dyeing concentration of natural fibers.
DESCRIPTION This paper aims to explain the variation of UV-Vis spectral parameters of preformated... more DESCRIPTION This paper aims to explain the variation of UV-Vis spectral parameters of preformated acid azo chromium (1:1) complex dyes resulted from the same coupling component, having benzene-azo-pyrazolone type structures, versus spectral parameters of (1:1) chromium complex of the metallizable azo dye: 2-aminophenol → 1-(4’-sulphophenyl)-3-methyl-5-pyrazolone acid, considered as the reference structure. Were taken into account the electronic effects (σ, π) of substituent. The purity and the molecular structure of these compounds were verified by means of thin layer chromatography, chromium analysis as well by spectral study in IR and UV-Vis ranges.
II International Leather Engineering Congress Innovative Aspects for Leather Industry May 12-13, ... more II International Leather Engineering Congress Innovative Aspects for Leather Industry May 12-13, 2011, Izmir-TURKIYE COMPLEX CHROMOGEN SYSTEMS APPLIED ON LEATHER Mircea Ruse, Alexandrina Nuta, Anca Angela Athanasiu, Constantin Alifanti, Elena Ionita, Loti ...
This paper aims to explain the variation of (UV-Vis) spectral parameters of pre-formed azo chromi... more This paper aims to explain the variation of (UV-Vis) spectral parameters of pre-formed azo chromium (1:1) complex dyes, containing the sulfonic group in the diazotation component, having aryl-azo-pyrazolone and aryl-azo-naphtaline type structures, (aryl=benzene, naphtaline) versus spectral parameters of (1:1) chromium complex of azo dyes (A): 2-aminophenol-4-sulphonic acid → acetoacetanilide and (B): 1diazo-2-naphtol-4sulphonic acid ® acetoacetanilide, considered as reference structures, taking into account the electronic effects (σ, π) of substituents.
This paper presents an experimental investigation characterizing the use of fixed bed ion exchang... more This paper presents an experimental investigation characterizing the use of fixed bed ion exchange for simultaneous removal of 60Co and 137Cs radionuclides and of anionic surfactant sodium linear alkyl benzene sulphonate from waste waters resulted in processing of spent nuclear fuel. The first experimental studies were carried out with simulated, non-radioactive, water systems. The use of water radioactive waste as the case of spent decontamination solutions was also checked in experimental investigation. The treatment of radioactive solutions by ion exchange technique was carried at two flow rates and at 250C. Experimental results obtained in simulated non radioactive system using ion exchange resins Purolite NRW 5050 or mixture with Purolite NRW 160 and Purolite NRW 3550 have shown their effectiveness in decontamination of polluted water with cobalt ions and anionic surfactant. In the tests with radioactive system the ion exchanger Purolite 1600 can be effectively used to achieve ...
Industrial & Engineering Chemistry Research, 2004
Nanoscale, high surface area cerium oxide (ceria) powders and stable, high-concentration (>1 M... more Nanoscale, high surface area cerium oxide (ceria) powders and stable, high-concentration (>1 M) ceria sols were prepared by a new method based on homogeneous precipitation in an acidic environment using cerium(IV) nitrate as the precursor. The results are compared with ceria powders and sols prepared by a hydrothermal method in a basic environment with cerium(III) nitrate as the precursor. Hydrolysis and condensation of the cerium(IV) and cerium(III) nitrates yield the ceria precursor precipitates with molecular formula of CeO2·2H2O [or Ce(OH)4] and CeO2·H2O [or Ce(OH)2O], respectively. The dried ceria precursor powders from Ce(IV) and Ce(III) are well dispersed in the form of primary particles of about 4 nm in size. Calcination at 450 °C causes phase transformation of the amorphous portion accompanying growth of the Ce(IV)-derived ceria crystallite or aggregation of the Ce(III)-derived ceria particles. The Ce(III)-derived ceria crystallites have a smaller lattice parameter than the Ce(IV)-derived sample ...
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Papers by Mircea G H . Ruse