Concept

Photochimie

Publications associées (99)

In vitro and in vivo photocytotoxicity of boron dipyrromethene derivatives for photodynamic therapy

Hubert van den Bergh, Georges Wagnières, Patrycja Nowak-Sliwinska, Siang Hui Lim

To understand the effects of substitution patterns on photosensitizing the ability of boron dipyrromethene (BODIPY), two structural variations that either investigate the effectiveness of various iodinated derivatives to maximize the "heavy atom effect" or ...

American Chemical Society2010

Limit Of Applicability Of The Monomer-Enhanced Mechanism For Radical Generation In Persulfate Initiated Polymerization Of Acrylamide

Jutta Christine Wandrey, Ignacio Rintoul

The limit of applicability of the monomer-enhanced mechanism as dominant mechanism ruling the initiation process of the polymerization of acrylamide (AM) initiated with potassium persulfate (K2S2O8) has been determined The kinetics and mechanisms for radic ...

Universidad Nacional del Sur y Consejo Nacional de Investigaciones Científicas y Técnicas2010

Selective photoexcitation of confined exciton-polariton vortices

Benoît Marie Joseph Deveaud, Gaël Nardin, François Morier-Genoud, Konstantinos Lagoudakis, Barbara Pietka

We resonantly excite exciton-polariton states confined in cylindrical traps. Using a homodyne detection setup, we are able to image the phase and amplitude of the confined polariton states. We evidence the excitation of vortex states, carrying an integer a ...

2010

Determination of the single-ion anisotropy energy in a S=5/2 kagome antiferromagnet using x-ray absorption spectroscopy

Henrik Moodysson Rønnow, Goran Nilsen

We report x-ray absorption and x-ray linear dichroism measurements at the Fe L-2,L-3 edges of the geometrically frustrated systems of potassium and hydronium iron jarosite. Comparison with simulated spectra, involving ligand-field multiplet calculations mo ...

2009

Retrieving photochemically active structures by time-resolved EXAFS spectroscopy

Majed Chergui, Wojciech Gawelda, Camelia Borca, Van Thai Pham, Amal El Nahhas, Renske Marjan van der Veen, Frederico Alves Lima

Describing the nature and structure of molecular excited states is important in order to understand their chemical reactivity and role as intermediates in photochemical reactions. The recent implementation of x-ray absorption spectroscopy in the ultrafast ...

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England2009

From Laboratory Studies to the Field Applications of Advanced Oxidation Processes: A Case Study of Technology Transfer from Switzerland to Burkina Faso on the Field of Photochemical Detoxification of Biorecalcitrant Chemical Pollutants in Water

César Pulgarin, Victor Sarria

The Fenton and photo-Fenton detoxification of non-biodegradable chemical pollution in water was investigated under simulated UV light in the laboratory and under direct sunlight in Ouagadougou, Burkina Faso. The laboratory experiments enable one to make a ...

Hindawi Publishing Corporation2009

Heterogeneity and relaxation dynamics of the photoexcited retianl Schiff base cation in solution

Majed Chergui, Goran Zgrablic, Stefan Haacke

We present steady-state and broadband femtosecond fluorescence spectra of the protonated Schiff base of retinal in various protic and aprotic solvents, as a function of the excitation wavelength. A detailed spectral decomposition of the time-resolved fluor ...

2009

Dynamic nuclear polarization techniques for magnetic resonance imaging and particles targets experiments

Sami Jannin

Within a collaboration with the Sample Environment and Polarised Targets (SEPT) group at Paul Scherrer Institut (PSI), we developed two Dynamic Nuclear Polarization (DNP) machines operating at ~ 1 K. The first one is working at an electron spin resonance f ...

EPFL2009

In-source photocatalytic reduction of disulfide bonds during laser desorption ionization

Hubert Girault, Liang Qiao, Hongyan Bi

A photosensitive plate based on sintered TiO2 nanoparticles has been developed to carry out in-source photo-induced reductions for cleavage of disulfide bridges using glucose as a hole scavenger during laser desorption ionization. ...

2008

Evaluated kinetic and photochemical data for atmospheric chemistry: Volume IV - gas phase reactions of organic halogen species

Michel Rossi

This article, the fourth in the series, presents kinetic and photochemical data sheets evaluated by the IUPAC Subcommittee on Gas Kinetic Data Evaluation for Atmospheric Chemistry. It covers the gas phase and photochemical reactions of organic halogen spec ...

2008

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