Search results for "chemical interaction"

Development of controlled release systems of biocides for the conservation of cultural heritage

2017

Abstract The presence of microorganisms is one of the main causes of monument deterioration. Biocides are usually applied after or before restoration in order to prevent or slow down microbial growth. Frequent applications are necessary leading to increased costs and high risks to humans and the environment. The aim of this study is the design of novel controlled release systems comprising a biocide loaded into a mesoporous silica. Pristine MCM41 as well as MCM41 functionalised with carboxy- (MCM41-COOH) and amino-groups (MCM41-NH2) were used. Biotin T and New Des 50, two commercial formulations, were chosen as biocides. The biocide encapsulation was performed adding the mesoporous silica t…

Book Review: Ions in Solution: Basic Principles of Chemical Interactions. By J. Burgess

1989

Physicochemical and perceptual interactions between composition/texture, taste and aroma: A way to enhance saltiness in foods

2009

Diplôme : Ph. D.; Excessive salt in the human diet is a major risk factor for hypertension and cardiovascular diseases. So, the World Health Organisation (WHO) advocates sodium reduction of foods as a cost-effective strategy to improve public health. Because of important functionalities of salt (NaCl) – salty taste and flavour enhancement, solutions are being sought to lower the salt content of processed foods without altering their taste. In this PhD work, the approach proposed was to use sensory interactions between the senses, especially composition/texture – saltiness interactions (i) and aroma-saltiness interactions (ii). The first part of this work aimed to investigate food compositio…

Probing the chemical interaction between iridium nanoparticles and ionic liquid by XPS analysis

2009

Abstract In situ X-ray photoelectron spectroscopy analysis of Ir(0) nanoparticles (1.6 ± 0.3 nm) dispersed in imidazolium ionic liquid (EMI.EtSO4) shows evidences of the effective interaction between the metallic clusters and the surrounding liquid. By monitoring the C 1s signal of the ionic liquid one observes a change of the binding energy in one of its components (C2) when in the presence of Ir nanoparticles. This result was corroborated by isotope labeling experiments.

Physical - chemical interaction of injection waters with depleted gas formations

2021

In order that the physical - chemical interaction of the injection water with the porous-permeable or fissured medium of reservoirs do not lead to their degradation, it is necessary that the waters to meet a number of quality conditions. The treatment and conditioning of the injectable waters is imperative to do so due to the fact that their provenance is different, such as reservoir waters, wastewater resulting from various operations – petroleum operations, meteoric waters, etc. and, in particular, due to the very large volumes of injected water. Failure to follow the steps associated with the water treatment process inevitably leads to premature reduction of the injection wells receptivi…

Spinterface: Crafting spintronics at the molecular scale

2014

A number of studies have suggested that molecular materials could offer similar performance as, or even potentially supersede, those of inorganic materials in spintronics devices. Radically new spintronics functionalities, unavailable with conventional inorganic materials, could stem from the interface between ferromagnetic (FM) and molecular materials, giving rise to the so-called “spinterface” field. In this article, we review the fundamental concepts, recent experiments, and perspectives in this fast rising field, where the functionality is brought from the bulk to the ultimate downscaled device: the interface. The article shows how spin-dependent hybridization at the FM metal/molecule i…

Physico-Chemical Interactions in the Flavor-Release Process

2017

The perception of flavor is induced by the release of aroma compounds in the vapor phase. The olfactory perception is not only related to the nature of aroma compounds initially present in the food, but also to their distribution between the different phases. After a description of the interactions established between the aroma compounds and different constituents of food, this chapter looks at physico-chemical characteristics of aroma compounds and at the composition and properties of food matrices. Then, in order to understand the behavior of aroma compounds in the matrices, study methods of interactions are described. The assessment of the release is done by determining the partition coe…

Understanding the physical and/or chemical interaction in POSS-poly(ethylene-co-acrylic acid) nanocomposites

2012

Ions in Solution: Basic Principles of Chemical Interactions. Von J. Burgess. Ellis Horwood, Chichester/Halsted Press, New York 1988. 191 S., geb. £ 1…

1988

A New Methodological Approach to Correlate Protective and Microscopic Properties by Soft X-ray Microscopy and Solid State NMR Spectroscopy: The Case …

2021

Hydrophobic treatment is one of the most important interventions usually carried out for the conservation of stone artefacts and monuments. The study here reported aims to answer a general question about how two polymers confer different protective performance. Two fluorinated-based polymer formulates applied on samples of Cusa’s stone confer a different level of water repellence and water vapour permeability. The observed protection action is here explained on the basis of chemico-physical interactions. The distribution of the polymer in the pore network was investigated using scanning electron microscopy and X-ray microscopy. The interactions between the stone substrate and the protective…