Influence of Natural Polysaccharides on the Redox Processes of CuTsPc Thin Films and Dopamine Sensing
Silio Lima de Moura,
Carlos Maria Müller Jevenois,
Maria Isabel Pividori,
José Aroldo Viana dos Santos,
Valtencir Zucolotto,
Ionara Nayana Gomes Passos,
José Ribeiro dos Santos Júnior
Issue:
Volume 2, Issue 5, September 2013
Pages:
146-156
Received:
8 August 2013
Published:
30 August 2013
Abstract: Energy diagrams have been obtained for copper tetrasulfonated phthalocyanine (CuTsPc) from electrochemical and electronic absorption measurements in layer-by-layer (LbL) films with cashew (Anacardium occidentale L.) and angico branco (Anadenanthera colubrina) natural polysaccharides in the anionic layers. In this study, LbL films were produced with either copper tetrasulfonated phthalocyanine or polysaccharides (cashew or angico branco). Since CuTsPc and the gums are polyanions, the multilayer deposition was carried out in a tetralayer fashion, in which a conventional cationic polyelectrolyte, namely poly (allylamine hydrochloride) (PAH), was interposed between the polyanionic layers. An alternative for the simultaneous determination of electrochemical signals was using the deconvolution procedure. Mathematical deconvolution of the peaks followed Gaussian analysis. The presence of the gum led to increased adsorption of the phthalocyanine, and enhanced the UV-VIS absorption and electrochemical response of the films. Furthermore, modified electrodes based on polysaccharides/phthalocyanine films were able to detect dopamine at concentrations as low as 10-5mol/L.
Abstract: Energy diagrams have been obtained for copper tetrasulfonated phthalocyanine (CuTsPc) from electrochemical and electronic absorption measurements in layer-by-layer (LbL) films with cashew (Anacardium occidentale L.) and angico branco (Anadenanthera colubrina) natural polysaccharides in the anionic layers. In this study, LbL films were produced with...
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Effects of Fire Retardants on Jute Fiber Reinforced Polyvinyl Chloride/Polypropylene Hybrid Composites
Shovon Bhattacharjee,
Muhammad Hasnan Sazzad,
Muhammed Ariful Islam,
M. M. Ahtashom,
Asaduzzaman,
Muhammed Yusuf Miah
Issue:
Volume 2, Issue 5, September 2013
Pages:
162-167
Received:
8 August 2013
Published:
20 September 2013
Abstract: Jute fiber (50 %) reinforced PVC+PP hybrid composites were prepared by injection molding and heat pressing. Mechanical properties (tensile strength, TS; bending strength, BS; tensile modulus, TM; bending modulus, BM; and impact strength, IS) and burning speed of composites were studied. Hybrid composite of 55 % PP and 45 % PVC showed the best results and was selected as desired specimen. TS, BS, TM, BM, IS and burning speed of the selected desired specimen (SDS) was found as 63.6 MPa, 68.7 MPa, 1.38 GPa, 1.76 GPa, 24 KJ/m2 and 3.2 cm/min respectively. Finer particle size Aluminium trihydrate (ATH) and Zinc borate with Antimony Trioxide (ZB-AT) was used as fire retardants. TS and IS decreased; on the contrary, TM and BM increased with increasing both AT and ZB-AT. But BS decreased with increasing ATH and increased with increasing ZB-AT. Burning speed of SDS reduced to 2.8 cm/min and 2.2 cm/min after using 10 % ATH and 10 % ZB-AT (ZB, 7.5%; AT, 2.5%) respectively.
Abstract: Jute fiber (50 %) reinforced PVC+PP hybrid composites were prepared by injection molding and heat pressing. Mechanical properties (tensile strength, TS; bending strength, BS; tensile modulus, TM; bending modulus, BM; and impact strength, IS) and burning speed of composites were studied. Hybrid composite of 55 % PP and 45 % PVC showed the best resul...
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