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(65) Production(s) de l'année 2016
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Evaporation-Induced Self-Structuring of Organised Silica Nanohybrid Films Through Cooperative Physical and Chemical Interactions 
Auteur(s): Cojocariu Ana M., Cattoën Xavier, Le Parc R., Maurin D., Blanc C., Dieudonne-George P., Bantignies J.-L., Wong Chi Man Michel, Bartlett John R.
(Article) Publié:
Physical Chemistry Chemical Physics, vol. 18 p.7946 (2016)
Ref HAL: hal-01279551_v1
DOI: 10.1039/C5CP02742J
WoS: 000372229700039
Exporter : BibTex | endNote
4 Citations
Résumé: In this work, we develop the concept of evaporation-induced self-structuring as a novel approach forproducing organised films by exploiting cooperative physical and chemical interactions under far-fromequilibriumconditions (spin-coating), using sol–gel precursors with multiple functional groups. Thin filmsof self-structured silsesquioxane nanohybrids have been deposited by spin coating through the sol–gelhydrolysis and condensation of a bridged organosilane bearing self-assembling urea groups. The resultingnanostructure, investigated by FTIR, AFM and SEM, is shown to be highly dependent on the catalyst used(nucleophilic or acidic), and can be further modulated by varying the spinning rate. FTIR studies revealed thepresence of highly organised structures under acidic catalysis due to strong hydrogen bonding between ureagroups and hydrophobic interactions between long alkylene chains. The preferential orientation of the ureacross-links parallel to the substrate is shown using polarized FTIR experiments.
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Effect of nano-modified SiO2/Al2O3 mixed-matrix micro-composite fillers on thermal, mechanical, and tribological properties of epoxy polymers
Auteur(s): Vaisakh Sadasivan, Mohammed Abdul Azeez Peer, Hassanzadeh Mehrdad, Tortorici Jean, Metz R., Ananthakumar Solaiappan
(Article) Publié:
Polymers For Advanced Technologies, vol. 27 p.905-914 (2016)
Texte intégral en Openaccess : 
Ref HAL: hal-01158708_v1
DOI: 10.1002/pat.3747
WoS: 000378733400007
Exporter : BibTex | endNote
25 Citations
Résumé: Thermo-mechanically durable industrial polymer nanocomposites have great demand as structural components. In this work, highly competent filler design is processed via nano-modified of micronic SiO2/Al2O3 particulate ceramics and studied its influence on the rheology, glass transition temperature, composite microstructure, thermal conductivity, mechanical strength, micro hardness, and tribology properties. Composites were fabricated with different proportions of nano-modified micro-composite fillers in epoxy matrix at as much possible filler loadings. Results revealed that nano-modified SiO2/Al2O3 micro-composite fillers enhanced inter-particle network and offer benefits like homogeneous microstructures and increased thermal conductivity. Epoxy composites attained thermal conductivity of 0.8 W/mK at 46% filler loading. Mechanical strength and bulk hardness were reached to higher values on the incorporation of nano-modified fillers. Tribology study revealed an increased specific wear rate and decreased friction coefficient in such fillers. The study is significant in a way that the design of nano-modified mixed-matrix micro-composite fillers are effective where a high loading is much easier, which is critical for achieving desired thermal and mechanical properties for any engineering applications.
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