MPŠ MP&Scaron MP&Scaron MP&Scaron Avtorji

Jo×ef Stefan
Postgraduate School

Jamova 39
SI-1000 Ljubljana

Phone: +386 1 477 31 00
Fax: +386 1 477 31 10


Course Description

Dielectric and Caloric Properties of Nanomaterials


Nanosciences and Nanotechnologies, third-level study programme


prof. dr. Vid Bobnar


The aim of this course is to acquire knowledge of dielectric, thermal and certain transport properties of nanostructured materials, and to become acquainted with the latest achievements in these fields. The lectures also give an extensive overview of experimental methods and measurement techniques.


Dielectric polarization and dielectric relaxation theory
Broadband dielectric measurements (the survey of methods, study of phase transitions and dynamics).
Dielectric properties of polar systems (liquid crystals, nanodomain systems, relaxors,, deuteron glasses, polymers and copolymers, biomaterials).
Specific heat of nanodomain systems (relaxors, nanomagnets, liquid crystals, glassy systems, biomaterials).
Study of phase transitions by measuring the thermal capacity and enthalpy (the survey of measurement techniques and critical behaviour noticed in nanostructured materials).
Transport properties of nanosystems (electric conductivity, transport of charge in nanotubes and nanowires, such as DNA, heat conductivity and diffusivity).
Influence of random fields, bonds and surfaces on thermal and dielectric properties of nanosystems (relaxors. spin glasses, liquid crystals in porous materials, and aerosol mixtures).

Course literature:

The latest articles from scientific journals (Nature, Science, Phys. Rev. Letters, Phys. Rev. B, E, Appl. Phys. Letters itd.).

F. Kremer in A. Sch÷nhals, Broadband Dielectric Spectroscopy, Springer Verlag, Berlin Heidelberg (2003)

A. Jonscher, Dielectric Relaxation in Solids, Chelsea Dielectric Press, London (1983)

N. Hill, W. E. PriceVaughan, A. H. Price, M. Davies, Dielectric properties and molecular behaviour,Van Nostrand, New York (1969)

C. J. F. B÷ttcher in P. Bordewijk, Theory of Electric Polarization vols. I, II, Elsevier, New York (1980)

J. Thoen, Thermal investigations of Phase Transitions in Thermotropic Liquid Crystals, Int.J. Mod. Physics B9, 2157 (1995)

Chapter 7 Calorimetric studies by C. W. Garland in Liquid Crystals, ed. S. Kumar, Cambridge University Press, Cambridge 2001

Significant publications and references:

BOBNAR, Vid, HROVAT, Marko, HOLC, Janez, KOSEC, Marija. Giant dielectric response in Pb(Zr, Ti)O[sub]3-Pb[sub]2Ru[sub]2O[sub](6.5) all-ceramic percolative composite. Appl. phys. lett., 2008, vol. 92, no. 18, str.

BOBNAR, Vid, LEVSTIK, Adrijan, HUANG, Cheng, ZHANG, Q. M. Enhanced dielectric response in all-organic polyaniline-poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) composite. J. non-cryst. solids. [Print ed.], 2007, vol. 353, str. 205-209.

BOBNAR, Vid, LEVSTIK, Adrijan, HUANG, Cheng, ZHANG, Q. M. Intrinsic dielectric properties and charge transport in oligomers of organic semiconductor copper phthalocyanine. Phys. rev., B, Condens. matter mater. phys., 2005, vol. 71, str. 041202-1-041202-4.

BOBNAR, Vid, MALIČ, Barbara, HOLC, Janez, KOSEC, Marija, STEINHAUSEN, R., BEIGE, H. Electrostrictive effect in lead-free relaxor K[sub](0.5)Na[sub](0.5)NbO[sub]3-SrTiO[sub]3 ceramic system. J. appl. physi., 2005, vol. 98, str. 024113-1-024113-4.

BOBNAR, Vid, BERNARD, Janez, KOSEC, Marija. Relaxorlike dielectric properties and history-dependent effects in the lead-free K[sub](0.5)Na[sub](0.5)NbO[sub]3-SrTiO[sub]3 ceramic system. Appl. phys. lett., 2004, vol. 85, str. 994-996.


Seminar and oral exam.

Students obligations:

Seminar and oral exam.