Electrically conductive polyaniline-hydrogel composites, produced via “in situ” dispersion polymerization

Optical properties of biocompatible polyaniline nano-composites

Abstract Polyaniline (PANI) is an electro-active polymer of great interest thanks to its outstanding physical and chemical properties which make it suitable for various applications in optics, bioelectronics, biosensors, diagnostics and therapeutic devices. Unfortunately, PANI is infusible and insoluble in most common solvents and, thus, very difficult to process. In the attempt of improving processability, yet preserving its interesting properties, PANI has been synthesized in the form of particles and dispersed into a hydrogel matrix. The synthesis of PANI–hydrogel composites proceeds via γ-irradiation of PANI dispersions as obtained by ‘in situ’ polymerization of aniline in the presence …

Electrically conductive polyaniline-hydrogel nanocomposites

La salute organizzativa nei contesti sanitari: Un’esperienza di ricerca-intervento.

ABSTRACT - From a psychosocial perspective that is intended to produce both understanding and change, especially involv-ing social actors in the construction of shared meanings, this paper illustrates the results of the first stage of an action research process focused on organizational health. The study has been carried out within an Italian hospital combining both quantitative and qualitative methods. Specifically, the data were gathered through the administration of Multidimensional Organizational Health Questionnaire (n=782) and focus group interviews whose transcripts were analyzed with the software T-Lab. The analysis of collected data has allowed us to trace the organizational health…

High incidence and increasing prevalence of MS in Enna (Sicily), southern Italy

Twenty years after a first survey, a follow-up study was performed on the prevalence of MS in Enna (Sicily), southern Italy. The prevalence of definite MS rose from 53 to 120.2 per 100,000 population. The incidence of definite MS for the period 1986 to 1995 was 5.7 per 100,000 per year. The innermost part of Sicily shows an elevated prevalence of MS, second only to Sardinia in the Mediterranean area.

Electrically conductive hydrogel composites made of polyaniline nanoparticles and poly(N-vinyl-2-pyrrolidone)

Abstract A novel electrically conductive composite material, consisting of polyaniline (PANI) nanoparticles dispersed in a polyvinyl pyrrolidone (PVP) hydrogel, was prepared ‘in situ’ by water dispersion polymerisation (DP) of aniline using PVP as steric stabiliser, followed by γ-irradiation induced crosslinking of the PVP component. Conversion yield of aniline into PANI particles was determined via HPLC and gas chromatography, while structural confirmation of the synthesised polymer was sought by FTIR. Morphology and dimensions of PANI particles into the coloured, optically transparent hydrogel was determined by electronic microscopy; moreover, swelling behaviour of composite hydrogels in …

Salute organizzativa e qualità dei servizi. Riflessioni su un'esperienza di ricerca-intervento psicosociale in ambito sanitario

Sintesi di materiali avanzati mediante radiazioni ionizzanti

Electrical properties of γ-crosslinked hydrogels incorporating organic conducting polymers

Abstract Hydrogel composites containing nanoparticles of the protonated emeraldine form of polyaniline (PANI-PE) have been synthesised by γ-irradiation, using either polyvinyl pyrrolidone (PVP) or polyvinyl alcohol (PVA) as steric stabilisers. Swelling behaviour of both hydrogels is reported, together with an electrical characterisation of composites, before and after gel network formation, performed by cyclic voltammetry and impedance spectroscopy. Similarities and differences between the two composite systems are discussed.

Atresia digiuno-ileale tipo apple-peel: raro esordio neonatale di fibrosi cistica

fibrosi cistica, atresia digiuno-ileale, apple-peel

Internal properties of gamma-irradiated polymeric hydrogels studied by means of fluorescent probes