Comparison of Raman, NIR, and ATR FTIR spectroscopy as analytical tools for in-line monitoring of CO2 concentration in an amine gas treating process

Chemical absorption of CO2 using aqueous amine-based solvents is one of the common approaches to control acidic gases emissions to the atmosphere. Improvement in the efficiency of industrial processes requires precise monitoring tools that fit with the specific application. Process monitoring using in-line multivariate measurement methods...

Gas response behaviour and photochemistry of borondiketonate in acrylic polymer matrices for sensing applications

Moon4You: A first Dutch footprint on the moon

Moon4You is an initiative led by the Dutch Organisation for Applied Scientific Research TNO, with partners from industry and universities in the Netherlands that aims to provide a combined Raman/LIBS instrument as scientific payload for lunar exploration missions, and specifically for Odyssey Moon's MoonOne mission, slated for launch in the...

Poly(ethylene glycol)-containing hydrogel surfaces for antifouling applications in marine and freshwater environments

This work describes the fabrication, characterization, and biological evaluation of a thin protein-resistant poly(ethylene glycol) (PEG)-based hydrogel coating for antifouling applications. The coating was fabricated by free-radical polymerization on silanized glass and silicon and on polystyrene-covered silicon and gold. The physicochemical...

Molecular details of ovalbumin-pectin complexes at the air/water interface: A spectroscopic study

To stabilize air-water interfaces, as in foams, the adsorption of surface-active components is a prerequisite. An approach to controlling the surface activity of proteins is noncovalent complex formation with a polyelectrolyte in the bulk phase. The molecular properties of egg white ovalbumin in a complex with pectin in the bulk solution and at...

Assessing the extent of protein intermolecular interactions at air-water interfaces using spectroscopic techniques

There is an ongoing debate about whether a protein surface film at an air-water interface can be regarded as a gelled layer. There is literature reporting that such films show macroscopic fracture behavior and a rheology comparable to three-dimensional protein bulk-networks. If this is the case, a complete description of the formation of...

Nanoscale electrical characterization of semiconducting polymer blends by conductive atomic force microscopy (C-AFM)

For the first time local electrical characteristics of a blend of two semiconducting polymers were studied with conductive atomic force microscopy (C-AFM). The investigated mixture is potentially interesting as the active layer in plastic photovoltaic devices. Besides conventional topography analysis of morphology and phase separation, the...

Sign constraints improve the detection of differences between complex spectral data sets: LC-IR as an example

Spectroscopy is a fast and rich analytical tool. On many occasions, spectra are acquired of two or more sets of samples that differ only slightly. These data sets then need to be compared and analyzed, but sometimes it is difficult to find the differences. We present a simple and effective method that detects and extracts new spectral features...

Investigation of the chromate conversion coating on Alclad 2024 aluminium alloy: Effect of the pH of the chromate bath

The parameters of the chromate bath, like temperature, pH, and fluoride content, strongly affect the morphology and chemical composition of the chromate conversion coating and as a consequence have a large influence on its corrosion performance. In this paper, electrochemical impedance spectroscopy (EIS) was used in combination with other...

Field desorption mass spectrometry in bioanalysis

Determination of trace amounts of butyltin compounds in aqueous systems by gas chromatography/mass spectrometry

A sensitive, reproducible, and interference-free method is presented for simultaneous determination of tri-, di- and monobutyltin species present in aqueous systems at tin concentrations of 0.01 - 5.0 ppm. The butyltin species are concentrated from HBr acidified aqueous solutions into an organic solvent by solvent extraction in the presence of a...