References of "Thomassey, Matthieu 40020605"
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See detailTemperature modulated optical refractometry: A quasi-isothermal method to determine the dynamic volume expansion coefficient
Müller, Ulrich UL; Philipp, Martine UL; Thomassey, Matthieu UL et al

in Thermochimica Acta (2013), 555

The volume expansion coefficient is a thermodynamic key parameter yielding insight into molecular cohesion and organization of condensed matter. We present here the novel experimental technique ... [more ▼]

The volume expansion coefficient is a thermodynamic key parameter yielding insight into molecular cohesion and organization of condensed matter. We present here the novel experimental technique temperature modulated optical refractometry (TMOR) to determine not only the static but also the dynamic volume expansion coefficient of transparent condensed matter of cubic or isotropic symmetry. A specialty of TMOR is its capability to measure the volume expansion coefficient under quasi-isothermal conditions. In this experimental mode TMOR is able to differentiate between static, dynamic and kinetic contributions to the volume expansion coefficient. Due to these features TMOR especially qualifies for the investigation of structural changes provoked by structural phase transitions, glass transitions and other structure-related transformations in transparent condensed matter. The scientific potential of this novel experimental technique is demonstrated by evidencing anomalies of the complex volume expansion coefficient accompanying the chemically induced glass transition occurring during the formation of a covalently cross-linked epoxy network. [less ▲]

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See detailEtude de propriétés dynamiques linéaires et non-linéaires de deux liquides colloïdaux modèles par rhéologie: DGEBA/Al2O3 et DGEBA/SiO2
Thomassey, Matthieu UL

Doctoral thesis (2012)

The dynamic mechanical behaviors of two model colloidal suspensions are compared in order to highlight microstructural changes in the suspensions. differentiate between the topological and physico ... [more ▼]

The dynamic mechanical behaviors of two model colloidal suspensions are compared in order to highlight microstructural changes in the suspensions. differentiate between the topological and physico-chemical impact of nanoparticles. For both systems the matrix material consists of the technologically relevant epoxy resin diglycidil ether of bisphenol A (DGEBA). The suspended nanoparticles are hydrophilic alumina and hydrophobic silica respectively. It will be shown that beside the classical α process an additional low-frequency relaxator exists whose qualitative frequency behavior is attributed to the pure presence of nanoparticles. The fine structure of the low-frequency relaxator depends on the physico-chemical surface properties of the nanoparticles. Similar to the α process the additional low-frequency relaxator shows cooperative behavior. Astonishingly, on the lines of the pure resin DGEBA, both colloidal suspensions show terminal behavior at very low frequency excitations. The nanoparticles are also shown to be responsible for non-linear dynamic and flow behaviors as well as for the emergence of free surface and volume instabilities. The transient character of flow is induced. [less ▲]

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See detailControlled electrodeposition of Cu-Ga from a deep eutectic solvent for low cost fabrication of CuGaSe2 thin film solar cells
Steichen, Marc UL; Thomassey, Matthieu UL; Siebentritt, Susanne UL et al

in Physical Chemistry Chemical Physics [=PCCP] (2011), 13(10), 4292-4302

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See detailThermal and chemical glass transition of thermosets in the presence of two types of inorganic nanoparticles
Baller, Jörg UL; Thomassey, Matthieu UL; Ziehmer, Markus UL et al

in Thermoplastic and thermosetting polymers and composites (2011)

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See detailThe catalytic influence of alumina nanoparticles on epoxy curing
Baller, Jörg UL; Thomassey, Matthieu UL; Ziehmer, Markus UL et al

in Thermochimica Acta (2011), 517

The curing process of diepoxide-triamine systems filled with water and untreated alumina nanoparticles has been investigated. The influence of both types of fillers on the curing process is very similar ... [more ▼]

The curing process of diepoxide-triamine systems filled with water and untreated alumina nanoparticles has been investigated. The influence of both types of fillers on the curing process is very similar. This is reflected by a similar shape of the heat flow (HF) and specific heat capacity curves during curing. A catalytic effect of hydroxyl groups in the water and on the nanoparticles surfaces is made responsible for the observed curing behaviour. It turns out that the strength of the catalytic effect depends on the type of filler. The described influence of alumina nanoparticles on thermoset curing is looked upon as being representative for nanocomposites consisting of epoxy thermosets and metal oxide nanoparticles without surface treatment. [less ▲]

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See detailInteractions between silica nanoparticles and an epoxy resin before and during network formation.
Baller, Jörg UL; Becker, Nora UL; Ziehmer, Markus UL et al

in Polymer (2009), 50(14), 3211-3219

In polymer nanocomposites, interactions between filler particles and matrix material play a crucial role for their macroscopic properties. Nanocomposites consisting of varying amounts of silica ... [more ▼]

In polymer nanocomposites, interactions between filler particles and matrix material play a crucial role for their macroscopic properties. Nanocomposites consisting of varying amounts of silica nanoparticles and an epoxy resin based on diglycidyl ether of bisphenol A (DGEBA) have been studied before and during network formation (curing). Rheology and mainly temperature modulated differential scanning calorimetry (TMDSC) have been used to investigate interactions between the silica nanoparticles and molecules of the epoxy oligomer or molecules of the growing epoxy network. Measurements of the complex specific heat capacity before curing showed that interactions between the nanoparticles and DGEBA molecules are very weak. An expression for an effective specific heat capacity of the silica nanoparticles could be deduced. Examination of the isothermal curing process after addition of an amine hardener yielded evidences for a restricted molecular mobility of the reactants in the cause of network formation. These restrictions could be overcome by increasing the curing temperature. No evidences for an incorporation of the silica nanoparticles into the epoxy network, i.e. for a strong chemical bonding to the network, were found. Interactions between the silica nanoparticles and the epoxy resins under study are assumed to be of a physical nature at all stages of network formation. [less ▲]

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