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Carlescu V.,Technical University Gheorghe Asachi | Breaban F.,University of Lille Nord de France | Breaban F.,University of Artois | Prisacaru G.,Technical University Gheorghe Asachi | And 2 more authors.
Materiale Plastice | Year: 2013

This paper refers to the electromechanical strain response of PDMS/TiO 2/SiO2 composites as an electroactive polymer actuator. Lightweight electro-active polymers (EAPs) are ideal for control surface since they offer high strain rate, fast response, high elastic energy density and ease of manufacture [1,2]. We investigate the frequency response and vibrational modes of rectangular films with aluminum electrodes using Scanning Laser Doppler Vibrometry (SLDV) technique described elsewhere [3,4]. The results showed a similar behaviour with those of acrylic and silicone films coated with carbon-based compliant electrodes from literature. Field-induced vibrational strains decrease with frequency due to the increase in stiffness of sample and change of dielectric permittivity. These materials are possible candidates in polymer actuators for micropump and micro-valve applications in MEMS. Source


Andronescu C.,Polytechnic University of Bucharest | Garea S.A.,Polytechnic University of Bucharest | Nicolescu A.,PetruPoni Institute of Macromolecular Chemical | Deleanu C.,PetruPoni Institute of Macromolecular Chemical | And 4 more authors.
High Performance Polymers | Year: 2015

The synthesis of a benzoxazine (BZ) monomer inside the montmorillonite (MT) layers was done using a diamino-modified MT as the amine component, phenol, and formaldehyde. The formation of the BZ rings within the MT layers was investigated by thermogravimetric analysis, X-ray photoelectron spectroscopy, proton nuclear magnetic resonance spectroscopy, and X-ray diffraction, this being enhanced when dioxane was used as the solvent. The morphology of the hybrid BZ monomer was investigated by scanning electron microscopy. © SAGE Publications. Source


Dragan E.S.,PetruPoni Institute of Macromolecular Chemical | Dinu M.V.,PetruPoni Institute of Macromolecular Chemical | Shankar G.,Shri Atal Vihari Vajpayee Government Arts and Commerce College
Research Journal of Chemistry and Environment | Year: 2015

Heavy metals and organic matter coming from various industrial processes are recognized as very dangerous pollutants. Removing metal ions and ionic dyes is a major industrial activity covering water softening to detoxification of wastewater and contaminated natural waters. This review is focused on the results reported in literature last decade regarding the preparation of novel and more efficient composite biosorbents based on polysaccharides and either inorganic fillers (zeolites, clays or magnetic nanoparticles), or synthetic polymers and on their application in the wastewater treatment. The influence of the parameters controlling the sorption process such as contact time, concentration of solute, temperature, pH has been discussed. Sorption capacity and reusability of the composite biosorbents have been evaluated in comparison with the individual components. Source


Ghiorghiasa R.,University of Agricultural Sciences and Veterinary Medicine, Iasi | Petrovici A.R.,PetruPoni Institute of Macromolecular Chemical | Rosca I.,PetruPoni Institute of Macromolecular Chemical | Miron L.,University of Agricultural Sciences and Veterinary Medicine, Iasi
Digest Journal of Nanomaterials and Biostructures | Year: 2016

Thiotriazinone (TTZ) is used as an intermediate of cephalosporin, but very few things are known about its activity. The purpose of this study was to form a complex of Thiotriazinone-α-cyclodextrine and to investigate its antimicrobial activity, in order to use this ”smart drug” in animal diseases therapy. The complex was made by liophlization at a molar ratio TTZ-αCD=1:1. Characterization was made by Raman spectroscopy and DSC. Antimicrobial activity was tested in vitro on Gram-positive bacteria (Staphylococcus aureus ATCC 25923, Sarcina lutea ATCC 9341), Gram-negative bacteria (Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC), and fungus (Candida albicans ATCC 10231, Candida glabrata ATCC MYA 2950, Candida parapsilosis ATCC 22019). The inclusion complex showed better antibacterial effect for S. aureus and S. lutea versus thiotriazinone. It may be noted that the compounds tested showed no antibacterial activity for E. coli and Pseudomonas aeruginosa. Although the tested compounds show antifungal activity against all fungal organisms, a more pronounced action was observed especially against C. glabrata. © 2016, Inst Materials Physics. All right reserved. Source

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