Papers by Author: Lucia Dumitrescu

Abstract: A number of issues related to composite structure analysis of variants of insoles, commonly used for getting comfortable wearing or improvement of posture deficiencies are presented in this research paper. In the first part of a paper some variants of biomechanical system consisting of composite structures - namely foot and insoles variants undergo analysis are presented and analyzed. This study aims to determine how these insoles react to the effect of temperature and humidity parameters during different time period. In the second part of the paper the experimental system and how to choose the group of samples analyzed are presented. The results and conclusions obtained from this study and the establishing the structural changes, evidenced by microscopic analysis are analyzed in the final part of the paper.

Abstract: The paper presents research concerning the synthesis and characterization of some new nanocomposite used as wood coating nanomaterials, consisting of a hybrid of organic (functionalized acrylic copolymers with iron lignosulfonate) and inorganic nanomaterials (ZnO nanoparticles obtained by sol-gel process). The presence of acrylic copolymers in water emulsion (based on monomers ethyl acrylate, butyl acrylate, acrylonitrile and the lignin derivative iron lignosulfonate) and ZnO nanoparticles enables the formation of a crosslinked nanometric network of inorganic and organic domains, emphasized by AFM analysis. The interphase characterization of the nanostructured materials synthesized was performed using FT-IR analysis. Considering the biocide activity for the acrylic copolymers, the lignin derivative iron lignosulfonate and ZnO nanoparticles, the obtained nanocomposites were biologically investigated and proposed as wood preservation agents.