This work describes two methos of synthesis of nanocomposites from biogenic material and their sp... more This work describes two methos of synthesis of nanocomposites from biogenic material and their spectroscopy and optical properties, quantitative analysis by LIBS and SPR response in order to determine the variations in energy bandgap.
... Phone: 58 212 6051381; fax: 58 212 6051246; e-mail: maria.ranaudo@ciens.ucv.ve ... 1955, 7 ( ... more ... Phone: 58 212 6051381; fax: 58 212 6051246; e-mail: maria.ranaudo@ciens.ucv.ve ... 1955, 7 ( 9) 23 30 [ChemPort]. 7. Sanchez, JHP ; Mansoori, GA In situ remediation of heavy ... Pina, A. ; Mougin, P. ; B har, E. Characterization of asphaltenes and modeling of flocculation State of ...
In linear and nonlinear spectroscopic studies of liquids and solutions with long pulse or cw lase... more In linear and nonlinear spectroscopic studies of liquids and solutions with long pulse or cw lasers, local heating of the sample has to be taken into account.1
Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia,... more Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
Solutions of nanofluids composed of dispersed metal-nanoparticles in water, possess exceptional t... more Solutions of nanofluids composed of dispersed metal-nanoparticles in water, possess exceptional thermo-optical properties. In the present work was studied the variation in the thermo-optical properties of nanofluids composed of metal-nanoparticles with different surfactants. It was used the single-pulsed laser excitation dual-beam mode- mismatched termal lens spectroscopy (TLS) for liquid samples. An experimental set-up of TLS was used and the thermal diffusibility and the dn/dT value of different nanofluids were studied, for this an Ar+ laser (514nm and 15.4mW) was used as excitation beam and a He-Ne laser (635nm) as a probe beam. The experiment showed that the thermal diffusibility of nanofluids is affected by the nature of the stabilizer, also it was observed an increase in the thermal diffusibility of nanofluids with respect at water without nanoparticles, for nanofluids with functionalized nanoparticles with PEG and SDS the heat transfer decreases compared to nanofluids without stabilizers.
The aggregation and adsorption of asphaltenes is of great interest due to their negative effects ... more The aggregation and adsorption of asphaltenes is of great interest due to their negative effects on the oil industry. Asphaltenes form aggregates, even at low concentrations, producing groups of mo...
A led-fluorescence spectroscopy method determinate the inhibitory effects of probe compounds on M... more A led-fluorescence spectroscopy method determinate the inhibitory effects of probe compounds on MAO-B activity is described. In this assay, we demonstrate the possibility of determinate the activity of MAO-B efficiently and rapidly without the use of reference substrate. Measuring variations in fluorescence intensity of MAO-B enzyme during the reaction with inhibitors, L-deprenyl and berberine IC50 and KI values were obtained.
This work describes two methos of synthesis of nanocomposites from biogenic material and their sp... more This work describes two methos of synthesis of nanocomposites from biogenic material and their spectroscopy and optical properties, quantitative analysis by LIBS and SPR response in order to determine the variations in energy bandgap.
... Phone: 58 212 6051381; fax: 58 212 6051246; e-mail: maria.ranaudo@ciens.ucv.ve ... 1955, 7 ( ... more ... Phone: 58 212 6051381; fax: 58 212 6051246; e-mail: maria.ranaudo@ciens.ucv.ve ... 1955, 7 ( 9) 23 30 [ChemPort]. 7. Sanchez, JHP ; Mansoori, GA In situ remediation of heavy ... Pina, A. ; Mougin, P. ; B har, E. Characterization of asphaltenes and modeling of flocculation State of ...
In linear and nonlinear spectroscopic studies of liquids and solutions with long pulse or cw lase... more In linear and nonlinear spectroscopic studies of liquids and solutions with long pulse or cw lasers, local heating of the sample has to be taken into account.1
Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia,... more Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
Solutions of nanofluids composed of dispersed metal-nanoparticles in water, possess exceptional t... more Solutions of nanofluids composed of dispersed metal-nanoparticles in water, possess exceptional thermo-optical properties. In the present work was studied the variation in the thermo-optical properties of nanofluids composed of metal-nanoparticles with different surfactants. It was used the single-pulsed laser excitation dual-beam mode- mismatched termal lens spectroscopy (TLS) for liquid samples. An experimental set-up of TLS was used and the thermal diffusibility and the dn/dT value of different nanofluids were studied, for this an Ar+ laser (514nm and 15.4mW) was used as excitation beam and a He-Ne laser (635nm) as a probe beam. The experiment showed that the thermal diffusibility of nanofluids is affected by the nature of the stabilizer, also it was observed an increase in the thermal diffusibility of nanofluids with respect at water without nanoparticles, for nanofluids with functionalized nanoparticles with PEG and SDS the heat transfer decreases compared to nanofluids without stabilizers.
The aggregation and adsorption of asphaltenes is of great interest due to their negative effects ... more The aggregation and adsorption of asphaltenes is of great interest due to their negative effects on the oil industry. Asphaltenes form aggregates, even at low concentrations, producing groups of mo...
A led-fluorescence spectroscopy method determinate the inhibitory effects of probe compounds on M... more A led-fluorescence spectroscopy method determinate the inhibitory effects of probe compounds on MAO-B activity is described. In this assay, we demonstrate the possibility of determinate the activity of MAO-B efficiently and rapidly without the use of reference substrate. Measuring variations in fluorescence intensity of MAO-B enzyme during the reaction with inhibitors, L-deprenyl and berberine IC50 and KI values were obtained.
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