Uniwersytet im. Adama Mickiewicza w Poznaniu
Wydział Fizyki

global_phase_1 global_phase_1bGlobal phase diagrams for freezing in porous media Using molecular simulations and free energy calculations based on Landau theory, we show that freezing/melting behavior of fluids of small molecules in pores of simple geometry can be understood in terms of two main parameters: the pore width H* (expressed as a multiple of the diameter of the fluid molecule) and a parameter alpha that measures the ratio of the fluid-wall to the fluid–fluid attractive interaction.  Ravi Radhakrishnan, Keith E. Gubbins, Małgorzata Śliwińska-Bartkowiak JOURNAL OF CHEMICAL PHYSICS, VOLUME 116, NUMBER 3, 15 JANUARY 2002
efect_of_freezing_3 efect_of_freezing_3s Effects of confinement on freezing and melting We present a review of experimental, theoretical, and molecular simulation studies of confinement effects on freezing and melting. We consider both simple and more complex adsorbates that are confined in various environments (slit or cylindrical pores and also disordered porous materials). C. Alba-Simionesco, B. Coasne, G. Dosseh, G. Dudziak, K. E. Gubbins, R. Radhakrishnan, M. Sliwinska-Bartkowiak JOURNAL OF PHYSICS: CONDENSED MATTER, 18 (2006) R15–R68
existence_of_hexatic_2 existence_of_hexatic_s2_b Existence of a Hexatic Phase in Porous Media Molecular simulations for simple fluids in narrow slit-shaped carbon pores exhibit crystal-hexatic and hexatic-liquid transitions that are consistent with Kosterlitz-Thouless-Halperin-Nelson-Young theory. Ravi Radhakrishnan, Keith E. Gubbins, Małgorzata Śliwińska-Bartkowiak PHYSICAL REVIEW LETTERS, VOLUME 89, NUMBER 7, 12 AUGUST 2002
electrospinrelaxation_4 electrospinrelaxation_4sElectron spin relaxation and quantum localization in carbon nanoparticle: Electron spin echo studies We present pulsed electron spin resonance measurements of activated carbon fibers (ACFs) for pristine samples and after adsorption of nitrobenzene in the fibers’ porous structure. Two-level tunneling state (TLS) model is discussed in order to define the nature of paramagnetic centers and to explain the electron spin-lattice relaxation mechanism in the studied system. Stefan Lijewski,  Magdalena Wencka, Stanislaw K. Hoffmann,  Mateusz Kempinski, Wojciech Kempinski, Malgorzata Sliwinska-Bartkowiak PHYSICAL REVIEW B 77, 014304 (2008)
novel_enhac_5 novel_enhac_5sNovel ice structures in carbon nanopores: pressure enhancement effect of confinement We report experimental results on the structure and melting behavior of ice confined in multi-walled carbon nanotubes and ordered mesoporous carbon CMK-3, which is the carbon replica of a SBA-15 silica template. The silica template has cylindrical mesopores with micropores connecting the walls of neighboring mesopores. Monika Jazdzewska, Małgorzata M. Sliwinska-Bartkowiak, Anatoly I. Beskrovnyy, Sergey G. Vasilovskiy, Siu-Wa Ting, Kwong-Yu Chan, Liangliang Huang and Keith E. Gubbins Phys. Chem. Chem. Phys., 2011, 13, 9008–9013
structural_analysis_6 structural_analysis_6sStructural analysis of water and carbon tetrachloride adsorbed in activated carbon fibres We report X-ray diffraction studies of water and carbon tetrachloride adsorbed in nanoporous activated carbon fibres. The fibres are built of turbostratic nanoparticles separated by quasi two-dimensional voids, forming narrow slit-shaped pores. Małgorzata Sliwinska-Bartkowiak, Henryk Drozdowski, Mateusz Kempinski, Monika Jazdzewska, Yun Long, Jeremy C. Palmer, Keith E. Gubbins Phys. Chem. Chem. Phys., 2012, 14, 7145–7153
phase_separation_7 phase_separation_7sPhase separation in confined systems We review the current state of knowledge of phase separation and phase equilibria in porous materials. Our emphasis is on fundamental studies of simple fluids (composed of small, neutral molecules) and well-characterized materials. Lev D. Gelb, K. E. Gubbins, R. Radhakrishnan, M. Sliwinska-Bartkowiak Rep. Prog. Phys. 62 (1999) 1573–1659. Printed in the UK
liquid-liquid_8 liquid-liquid_8sLiquid-Liquid Phase Equilibria in Porous Materials Theoretical and experimental results are presented for the effect of confinement on liquid-liquid phase equilibria for binary mixtures. Density functional theory calculations for a symmetric Lennard-Jones mixture in pores show the following qualitative features: a reduction in the critical mixing temperature, and a shift in the coexistence curve toward the component 1-rich side of the phase diagram when molecules of component 1 are more strongly attracted to the walls. M. Sliwinska-Bartkowiak,S. L. Sowers, K. E. Gubbins Langmuir 1997, 13, 1182-1188
an_apparent_9 an_apparent_9sAn apparent critical point in binary mixtures: Experimental and simulation study We report the experimental and simulation studies for the system of nitrobenzene-cyclododecane, showing an apparent critical point, which lies in their metastable, experimentally inaccessible state, below their melting point, affecting physical and chemical properties of this system in the stable liquid phase. The nonlinear dielectric effect NDE was measured in the mixture of nitrobenzene with cyclododecane. The mixture has been found to show an apparent critical point which lies below the melting point, manifested as anomalous NDE behavior in the vicinity of the critical concentrations in the stable liquid phase. Małgorzata Śliwińska-Bartkowiak, Błażej Ratajczak, Leszek Golibrocki, and Michał Banaszak THE JOURNAL OF CHEMICAL PHYSICS 124, 144516 2006

Fizyka rozszerza nasze horyzonty myślowe. Jest ona doskonałą szkołą naukowego myślenia, naukowego krytycyzmu i naukowej skromności.