Search results

1

Synthesis and Characterization of Carbon Nanotubes Decorated with Gold Nanoparticles

100%

Dobrzanski L., Pawlyta M., Krzton A., Liszka B., Tai C., Kwasny W.

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issue 3

483-486

EN

In presented work we report results of simple and viable method for producing Au/CNT composites. Chemical composition and crystallographic structure of the Au/CNT composites was confirmed by X-ray diffraction measurements, while transmission and scanning electron microscopy were used to characterize the morphology of nanocrystals as well as the distribution of nanocrystals in the composite. The obtained particles with relatively small diameter (less than 9 nm) were found to be spatially well dispersed on the carbon nanotubes. The density of attached Au-nanoparticles is not sufficient, and cannot be improved by simple increasing gold loading.

2

Nanostructure and Thermal Behaviour of Liquid Crystalline Oligoester

51%

Janicki J.

Acta Physica Polonica A

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2002

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vol. 101

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issue 5

761-766

EN

The nanostructure and thermal behaviour of liquid crystalline oligoester were examined by combination of real-time synchrotron small-angle and wide-angle X-ray scattering methods with differential scanning calorimetry. The synthesized oligoester exhibits ability to form a thermotropic mesophase. It was shown that solid crystalline state is observed in the temperature range 25 to 123ºC and liquid crystalline state between 118-156ºC. The transition temperature determined from dynamic small-angle and wide-angle X-ray scattering experiments agrees very well with the results obtained from differential scanning calorimetry.

3

Modelling of SubPc Self-Assembly on Ag(111)

51%

Petrauskas V., Tornau E., Lapinskas S.

Acta Physica Polonica A

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2005

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vol. 107

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issue 2

388-391

EN

The ordering of subphthalocyanine molecules into honeycomb and hexagonal close packed patterns on Ag(111) is described using complex Lennard-Jones-type intermolecular potential. We rescale Ag(111) lattice, and take into account an infinite exclusion of first, second, and third neighbours, attraction - of fourth and fifth, and repulsion - of sixth and seventh. The phase diagram is obtained by the lattice gas model using Monte Carlo simulations. Very strong first order phase transitions, causing the two-phase co-existence, are found between disordered and honeycomb as well as between disordered and hexagonal closed packed phases.

4

Statistical Investigation of Current-Voltage Characterization in Single Molecule-Metal Junctions

51%

Kirchner T., Briechle B., Scheer E., Wolf J., Huhn T., Erbe A.

Acta Physica Polonica A

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2012

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vol. 121

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issue 2

410-415

EN

We show statistical measurements of single molecule-metal contacts using the mechanically controllable break junction technique. The measurements are carried out in a solvent, in order to allow in situ binding of the molecules to the metallic contacts during the measurements. Statistics is gathered by opening and closing the junctions repeatedly and recording current-voltage characteristics at various stages of the opening and closing curves. By modeling the data with a single level model we can extract parameters such as the position of the molecular energy level, which carries the current, and the coupling between the metal and the molecule. In first experiments we use this method to characterize different anchoring groups, which mediate the mechanical and electrical coupling between the metallic electrodes and the molecules. We use tolane molecules, which are structurally simple, as model systems for this purpose.

5

Investigation of Ferritin Desorption from Gold Initiated by In Situ pH-Change

51%

Poór V., Kasyutich O., Hallam K., Schwarzacher W.

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issue 2

394-396

EN

One of the main questions regarding protein adsorption is about the reversibility of the adsorption process. To get a deeper understanding of this, adsorption of ferritin on Au was studied by quartz crystal microbalance and the pH of the buffer was changed in situ between two values that favour adsorption by different amounts. We found that although some ferritin desorbs from Au, the desorption is incomplete. When the desorption reached a constant value, we returned to the original conditions and investigated the readsorption. Our experiments show that the adsorption of ferritin onto Au is a partly reversible process. We found that for different initial ferritin coverages the proportion of ferritin that had been subsequently desorbed was approximately constant.

6

Consequences of Confinement Conditions on Absorption in Molecular Nanofilms

38%

Šetrajčić I., Rodić D., Šetrajčić J., Šetrajčić-Tomić A., Vučenović S.

Acta Physica Polonica A

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2018

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vol. 133

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issue 1

129-139

EN

This paper presents a model of molecular ultrathin crystalline film and analysis of dielectric properties of these spatially very restricted structures. Using the two-time dependent Green functions the energy spectrum and possible exciton states were determined and the dynamic permittivity was calculated. It was shown that the appearance of localized states in the boundary layers of the film depend on the thickness and the changing values of parameters in the border areas of the film. These localized states define schedule and determine the number of resonant absorption lines in the infrared area of the external electromagnetic radiation.

7

Investigation of PCM Microcapsules with Paraffin Filling by Positron Lifetime Spectroscopy

32%

Zgardzińska B.

Acta Physica Polonica A

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2015

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vol. 127

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issue 5

1536-1539

EN

Positron annihilation lifetime spectroscopy was applied to investigate the microcapsules composed of n-eicosane (filling material) and polysiloxane polymer (shell) in the range of temperatures 123-333 K. Pure components of microcapsules were also investigated as a base for interpretation of the measurement results. The temperature of phase transitions in microcapsules was determined. It showed the appearance of a rotary phase, which is not present in pure n-eicosane. In the considered material, two types of free volume have been identified. The sizes of free volumes able to accommodate Ps were estimated using standard models. On the basis of the o-Ps intensities, the content of polysiloxane in microcapsules was estimated as about 40%. Internal structure of the microcapsules (morphology) was observed by scanning electron microscopy.

Refine search results

Synthesis and Characterization of Carbon Nanotubes Decorated with Gold Nanoparticles

Nanostructure and Thermal Behaviour of Liquid Crystalline Oligoester

Modelling of SubPc Self-Assembly on Ag(111)

Statistical Investigation of Current-Voltage Characterization in Single Molecule-Metal Junctions

Investigation of Ferritin Desorption from Gold Initiated by In Situ pH-Change

Consequences of Confinement Conditions on Absorption in Molecular Nanofilms

Investigation of PCM Microcapsules with Paraffin Filling by Positron Lifetime Spectroscopy