Pavel Kubát

Pic 1 Spectroscopy of photoactive materials

 Presentation video 

E-mail

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pavel.kubat@jh-inst.cas.cz

Current projects



Photophysics and Photochemistry of Self-Assembled Nanostructures
Czech Science Foundation P208/10/1678   2010 - 2012.


J.Heyrovský Institute of Physical Chemistry, v.v.i., ASCR, Praha (P. Kubát, coordinator)
Institute of Inorganic Chemistry, v.v.i., ASCR, Řež (K. Lang)
Faculty of Science, Charles University,  Praha (J. Mosinger)
Institute of Physical Biology, University of South Bohemia, Nové Hrady (T. Polívka)


The general goal of this project is to construct novel size- and shape-controllable photoactive self-assemblies of high structural integrity and with unique physical a chemical properties. The research includes:
(1) Formulation of new self-assembled nanostructures, design and synthesis of the building blocks.
(2) Solution-phase self-assembly controlled by presence of templates, solvent, pH, temperature, salt concentration, incubation time, and other factors. The formation of various self-assembled structures will be driven by various noncovalent interactions including electrostatic, metal−ligand coordination,p-p interaction, van der Waals, hydrogen bonding, and other type of interaction. The covalent strategy is not in the focus of our studies.
(3) Deposition of self-assembled structures on substrates from solution by drop-casting, spin-coating and Langmuir-Blodgett techniques. Measurement of physicochemical properties, visualization by microscopic method (AFM, TEM, fluorescence microscopy etc.)
(4) Characterization of photoinduced processes both in solution and in the solid state by time–resolved methods covering the time domain extending from femtoseconds to seconds, as well as by steady-state spectroscopic techniques.

nanostructure


Photoactive hybrid materials
Czech Science Foundation P207/10/1447   2010 - 2013
 

Institute of Inorganic Chemistry, v.v.i., ASCR, Řež (K. Lang, coordinator)J. Heyrovský Institute of Physical Chemistry, v.v.i., ASCR, Praha (P.Kubát)
Institute of Chemical Technology, Praha (F. Kovanda)
Faculty of Science, Charles University, Praha (J. Mosinger)

hybridHybrid materials designed in this project combine suitable properties of both inorganic (carrier, protection) and organic (photoactivity, forming) components so that photoactive compounds can be activated by visible radiation. Nanostructured hybrid materials are based on layered double hydroxides (LDH) and layered silicates predominantly in the form of oriented films, self-standing films, and porphyrin-LDH/polymer films. We intend (i) to develop the methods of fabrication of hybrid materials with intercalated active molecules, (ii) to control photofunctions (e.g., energy transfer, singlet oxygen formation), (iii) to elucidate the role of a matrix structure on the organization, distribution, orientation and structure of intercalated (active) molecules, and (iv) to characterize structure - release and structure - photofunction relations. We are going to develop materials applicable as carriers of active molecules and materials with controlled photophysical properties, e.g., producing singlet oxygen upon visible light irradiation that leads to bactericidal surfaces.


Nanofabrics producing singlet oxygen
Czech Science Foundation 203/08/0831   2008-2010

Faculty of Science, Charles University, Praha (J. Mosinger, coordinator)Institute of Inorganic Chemistry, v.v.i., ASCR, Řež (K. Lang)
J. Heyrovský Institute of Physical Chemistry, v.v.i., ASCR, Praha (P.Kubát)
Technical University, Liberec (O. Jirsák)


The aim of the project focuses on the preparation, characterization and applications of novel functionalized textiles composed of nanofibres.  In the present project we would like to study (photo)physical, (photo)chemical and (photo)disinfecting properties of nonpolar porphyrinoid sensitizers and aromatic endoperoxides encapsulated into transparent polymer nanofabrics as host materials. The combination of cytotoxic singlet oxygen producing by sensitizers or endoperoxides with large specific surface, transparency and good oxygen permeability of polymer nanofibres could represent unique sterile and auto-disinfecting materials. These materials can also be used as handy sources of singlet oxygen for several chemical reactions.
nanofabrics