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Seminars - December 2014

 

THURSDAY 4 DECEMBER

Smart Materials can be Responsive, Multifunctional, Green, and even Self growing

by Athanassia Athanassiou

At 11:00 a.m. Ground floor, meeting room - CSHR (IIT), Corso Trento 21, 10129 Torino

 

WEDNESDAY 10 DECEMBER

Emerging CMOS multielectrode array devices: circuits and applications for neuroscience

by L. Berdondini, A. Maccione, G. Angotzi

At 11:00 a.m. Ground floor, meeting room - CSHR (IIT), Corso Trento 21, 10129 Torino

Course ORIGIN - November 14, 2014

Giornata di presentazione del software ORIGIN per l'analisi dati

At 10:00 a.m. Ground floor, meeting room - CSHR (IIT), Corso Trento 21, 10129 Torino

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Tom’s Hardware - Article

Come ti cambio l'elettronica: inchiostri conduttivi, l'Italia c'è

di Manolo De Agostini

inchiostri-conduttivi-news

Per saperne di più.../ Read more...

Advanced Functional Materials

Article Chiolerio etal

Alessandro Chiolerio, Sergio Bocchini, Samuele Porro

Inkjet printed negative supercapacitors: synthesis of polyaniline-based inks, doping agent effect and advanced electronic devices applications

ADVANCED FUNCTIONAL MATERIALS, 22 (2014) 3472

Low frequency negative supercapacitors and high frequency negative capacitors are realized developing a polyaniline (PANI) based ink for piezoelectric inkjet printers, water based. PANI is synthesized by oxidation polymerization starting from the aniline dimer, thus avoiding the use of a toxic/mutagen substance such as aniline. In order to work in aqueous phase, the reverse addition of the dimer in the oxidative solution is made. The chlorinated emeraldine salt of PANI is produced and emeraldine base is prepared by dedoping. Two different doped PANI solutions are produced by solubilization of the emeraldine salt in dimethylsulphoxide and addition of respectively trifluorosulfonic acid and camporsulfonic acid, and then used as inks for the fabrication of inkjet-printed tracks of different geometries. The properties of inkjet-printed devices are characterized both in DC and AC regimes, showing very good performances under specific measurement conditions in terms of conductivity, as well as extremely interesting phenomena whose origin is still under debate, such as low frequency negative supercapacitance, high frequency negative capacitance and negative resistance. The realization of the highest negative supercapacitance realized so far, of –2.3 mF @ 30 Hz, corresponding to a specific mass capacity of –799 F g−1, is reported.

Full paper

Seminar - June 27, 2014

Synthesis of ferroelectric perovskites; and development of polymer nanocomposites

Dr. Mohammed Fahim Ansari, M.Sc., Ph.D

At 03:00 p.m. Ground floor, meeting room - CSHR (IIT), Corso Trento 21, 10129 Torino

Several ferroelectric perovskites (powder and ceramics) have been synthesized and characterized in our laboratory. These perovskites were synthesized using a low temperature sol-gel chemical route with two basic objectives. Firstly, to study the effect of processing conditions (long gelation time, use of different precursors and annealing temperature) on structural, morphological, thermal, dielectric and conductivity properties, and secondly to study the effect of sintering conditions (time and temperature) on dielectric properties of ceramics. Perovskites like BaTiO3, Ba1-xSrxTiO3 (x = 0, 0.2, 0.3, 0.4, 0.5, 1), Ba0.8Sr0.2(ZrxTi1-x)O3, Ba0.8Ca0.2(Zr,Ti)O3, Pb(ZrxTi1-x)O3, Sr0.3Ba0.7Nb2O6, 0.5(Sr0.3Ba0.7TiO3)-0.5(Sr0.3Ba0.7Nb2O6) have been synthesized using sol-gel chemical route and characterized for their dielectric behaviour. Sintering aids like MnO2, Li2CO3, Nb2O5 have also been used to lower the sintering temperature of ceramics.
Temperature and frequency dependent dielectric studies showed that in the case of BST ceramics, addition of Sr shifts the Curie Temperature towards a lower temperature. However, it reduces the dielectric constant. However, when Zr is added along with Sr, the Tc lowers and dielectric constant increases significantly. In the case of SBN, which is a good pyroelectric material, it was observed that when SBT is used in SBN not only Tc shifts to the lower temperature but the magnitude of dielectric constant also increases. Work is in progress to analyze the effect of addition of sintering aids to lower the sintering temperature of BST and PZT.
A series of graphene filled polystyrene nanocomposites (by changing the concentration of graphene) was developed using in-situ polymerization followed my compression moulding method. Rheological, morphological, structural, dielectric and electrical characterization of the samples showed improved properties and better dispersion of graphene at lower concentration (less than 2 wt%).
Polymer composites have also been developed by using a polyurethane resin derived from vegetable oil and plant fibres.  The composites so developed are being studied for their bio-degradability and multifunctional use as sheets, membrane, filters, coatings etc.

 

Dr. Mohammed Fahim Ansari, M.Sc., Ph.D (Physics)

I am teaching as Assistant Professor in the Department of Physics, Zakir Husain Delhi College, affiliated to University of Delhi since 2007. Before joining as a full time faculty in the Department, I completed my Post Doctoral research from ITMMEC, Indian Institute of Technology Delhi (IIT Delhi) and Department of Physics and Astrophysics (University of Delhi). I did my M.Sc. in Physics from Barkatullah University, Bhopal and then completed my Ph.D in physics from Regional Research Laboratory (now Advanced Materials Processing Research Institute CSIR Bhopal) in Physics. The topic of my Ph.D thesis is “Tribological studies of some FRP materials” . My areas of research interest are: Tribology of high performance, Polymer composites, Synthesis and characterization of  ferroelectric perovskites, Development of Bio-degradable polymer composites, Carbon nanofillers filled polymer nanocomposites.
I have co-authored two books with my Ph.D guide on Tribology of FRP composites, three invited chapters in handbooks and published around 25 research papers in Indian and international journals.
Currently I am working on three research projects funded by University Grants Commission (UGC) and University of Delhi. I will speak on “Synthesis of Ferroelectric perovskites and development of polymer nanocomposites”.

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