A5009101260- Spectroscopy and Quantum Chemical Studies
- Atmospheric chemistry and aerosols
- Mine drainage and remediation techniques
- Spectroscopy and Laser Applications
- Heavy metals in environment
- Air Quality Monitoring and Forecasting
- Wastewater Treatment and Nitrogen Removal
- Atmospheric aerosols and clouds
- Enzyme Catalysis and Immobilization
- Chromium effects and bioremediation
- Arsenic contamination and mitigation
- Atmospheric Ozone and Climate
- Algal biology and biofuel production
- Microbial Metabolic Engineering and Bioproduction
- Microbial Fuel Cells and Bioremediation
- Biofuel production and bioconversion
- Microbial bioremediation and biosurfactants
- Electrostatics and Colloid Interactions
- Molecular spectroscopy and chirality
- Groundwater flow and contamination studies
- Polysaccharides and Plant Cell Walls
- Lipid Membrane Structure and Behavior
- Energetic Materials and Combustion
- Chemical Thermodynamics and Molecular Structure
- Environmental remediation with nanomaterials
Flemish Institute for Technological Research
2009-2022
University of Victoria
2012-2021
ETH Zurich
2018-2021
Charles Humbert 8
2018-2020
Université de Sherbrooke
2017
University of Parma
2016
Defence Research and Development Canada
2009-2010
Corning (United States)
1997
Universität Innsbruck
1995
Dalton State College
1992
Vibrational sum frequency generation (SFG) spectroscopy was utilized to distinguish different populations of water molecules within the electric double layer (EDL) at silica/water interface. By systematically varying electrolyte concentration, surface deprotonation, and SFG polarization combinations, we provide evidence two regions that have distinct pH-dependent behavior when Stern is present (with onset between 10 100 mM NaCl). For example, near in can be probed by pss combination, while...
Homo- and heterospectral correlation analysis are powerful methods for investigating the effects of external influences on spectra acquired using distinct complementary techniques. Nonlinear vibrational spectroscopy is a selective sensitive probe surface structure changes, as bulk molecules excluded basis symmetry. However, result this exquisite specificity, it blind to changes that may be occurring in solution. We demonstrate between surface-specific techniques probes such infrared...
The influence of different extraction methodologies was assessed on the composition both neutral (arabinose, rhamnose, galactose) and acidic (galacturonic acid) pectic polysaccharides obtained from four agro-industrial residues, namely, berry pomace (BP), onion hulls (OH), pressed pumpkin (PP), sugar beet pulp (SBP). For polysaccharides, efficiency as BP (nitric acid-assisted extraction, 2 h, 62.9%), PP (enzymatic-assisted 12 75.0%), SBP 48 89.8%; nitric 4 76.5%), OH (sodium...
Vibrational sum-frequency generation spectroscopy is valued for its ability to selectively probe molecules at a variety of interfaces without the use extrinsic chromophores. The spectra contain valuable information regarding molecular structure and interfacial environment through observation vibrational resonances associated with specific moieties. Chemical obtained by close inspection frequencies these bands amplitude response under conditions different beam polarizations. Such sensitivity...
Molecular dynamics simulations have been used to study the structure of water molecules adjacent solid hydrophobic and hydrophilic surfaces. The surfaces resemble self-assembled monolayers with methyl termination, whereas are terminated hydroxyl groups. resulting is characterized by its density profile, order parameters, molecular tilt-twist distribution as a function distance from surface. In both cases, results compared those obtained in bulk also vapor–water interface. To make deeper...
Photoacoustic spectroscopy is widely used to measure the light absorption of aerosols. However, impact key factors such as effect relative humidity and mass exchange on photoacoustic measurements are still poorly understood. We assess measurement biases their physical origin by analysing signal single tetraethylene glycol (TEG) particles at varying humidities. Our results show a decrease in elevated humidities for small (0.8-1.5 μm), while larger sizes (2.2-3.2 μm) trend reversed. model...
Abstract Rhodomonas salina is a microalgal species, belonging to the cryptophytes, and widely used as aquaculture feed because of its high nutritional profile phycoerythrin content. This study investigated effect pH on growth, biochemical composition, taste R. when cultivated semi-large scale under natural light conditions. Two tubular photobioreactors (200 L) were for cultivation with sunlight only illumination source. different setpoints applied, 7 8.5. Optimal temperature nutrient...
Summary Pseudomonas putida BN210, carrying the self‐ transferable clc ‐element encoding degradation of 3‐chlorobenzoate on chromosome, was used as inoculum in different membrane biofilm reactors treating 3‐chlorobenzoate‐contaminated model wastewater. Analysis bacterial population effluent and showed loss BN210 beyond detection from appearance several novel mineralizing bacteria mainly belonging to β ‐proteobacteria. In contrast, non‐inoculated reactors, no observed degraders could be...
We provide a complete and consistent framework in which vibrational spectra may be modeled from molecular properties gleaned spectra. This includes practical advice on how to define use the rotation operators when moving between laboratory coordinate systems. At same time, we some tips for facile comparison of analytical orientation distributions construction dynamics simulations. illustrate these approaches infrared absorption, Raman scattering, sum-frequency generation spectroscopy.
Total internal reflection infrared (IR) absorption and visible–IR sum-frequency spectroscopies were used to study the role of acrylic acid in evolution surface structure a poly(butyl acrylate)-based pressure-sensitive adhesive during drying process. By monitoring these spectral responses calculating heterospectral correlation coefficients, we established that alters nature molecular interactions at surface. In absence acid, butyl acrylate orientation is driven by packing polymer as water...
The mass accommodation coefficient, αM, describes evaporation and condensation kinetics at the liquid–vapor interface. In spite of numerous experimental efforts, reliable values αM are still not available for many substances. Here, we present a novel technique, photothermal single-particle spectroscopy (PSPS), that allows robust retrieval coefficients from three simultaneous independent measurements. PSPS combines resonant photoacoustic absorption with modulated Mie scattering measurements...
A new method is proposed to analyze Doubly Resonant infrared–visible Sum-Frequency Generation (DR-SFG) spectra. Based on the transform technique, this approach free from assumptions about vibronic modes, energies, or line widths and accurately captures through overlap spectral function all required aspects of structure simple experimental linear absorption Details implementation are provided along with three examples treating rhodamine thin films one monolayer thick. The technique leads a...