PSJD - Yadda

1

Low pressure RF plasma modification of the surface of three different nano-carbon materials

100%

Bertóti I., Mohai M., Balázsi C., László K., Szépvölgyi J.

Open Chemistry

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2015

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vol. 13

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issue 1

EN

Well-ordered nano-carbon materials, like multi-wall carbon nanotubes, graphene oxide, graphene due to their unique physical and chemical properties, are candidates for promising applications. In this work thin multilayered graphene, single layer graphene oxide layers and highly oriented pyrolytic graphite (HOPG) surface were treated by RF activated N2 gas plasma at nominally room temperature. Negative bias in the 0–200 V range and treatment time of 10 min was applied. Surface chemical alterations were followed by X-ray photoelectron spectroscopy (XPS). The applied treatments resulted in a significant build-up of nitrogen in the surface of these nano-carbon materials. The amount of nitrogen varied between 4 and 10 atomic %, depending on type of carbon and on biasing conditions. Evaluating the high-resolution N1s XP spectral region, typically three different chemical bonding states of the nitrogen were delineated. Peak component at 398.3 eV is assigned to C=N–C type, at 399.7 eV to sp2 N in melamine-type ring structure and at 400.9 eV to N substituting carbon in a graphite-like environment. Identical chemical bonding of the nitrogen was detected on the surface of HOPG treated in the same way for comparison.

2

Polyvinylpyrrolidone-Based Coatings for Polyurethanes – The Effect of Reagent Concentration on Their Chosen Physical Properties

100%

Butruk B., Trzaskowski M., Ciach T.

Chemical and Process Engineering

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2012

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vol. 33

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issue 4

563-571

EN

A method of manufacturing hydrogel coatings designed to increase the hydrophilicity of polyurethanes (PU) is presented. Coatings were obtained from polyvinylpyrrolidone (PVP) by free radical polymerisation. The authors proposed a mechanism of a two-step grafting - crosslinking process and investigated the influence of reagent concentration on the coating’s physical properties - hydrogel ratio (HG) and equilibrium swelling ratio (ESR). A surface analysis of freeze-dried coatings using scanning electron microscopy (SEM) showed a highly porous structure. The presented technology can be used to produce biocompatible surfaces with limited protein and cell adhesive properties and can be applied in fabrication of number of biomedical devices, e.g. catheters, vascular grafts and heart prosthesis.

3

Molecular Fingerprints of Thyroid Cancer Cells by Using Library of Molecular Receptors Formed by N-Lipidated Peptides Immobilized on Cellulose

88%

Fraczyk J., Walczak M., Balcerzak W., Pokajewicz K., Wieczorek P., Młynarski W., Fendler W., Kaminski Z. J.

Acta Poloniae Pharmaceutica - Drug Research

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2018

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vol. 75

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issue 4

1017-1029

EN

A novel diagnostic method based on recognition of qualitative and quantitative composition of healthy and tumor tissue samples by library of molecular receptors was presented. Molecular receptors were formed by self-organization of N-lipidated peptides attached in the regular fashion via aminophenylamino-1,3,5-triazine linker to the surface of cellulose plate. For samples testing, the library was cloned into multiple, identical copies and for each experiment the new clone was used. The binding process was monitored by staining the discs with Brilliant Black and quantitative color measurement was performed in 256 grade gray scale. Substantial differences in the composition of healthy and tumor samples were observed in most cases. The highly individual chemical fingerprints were found to be reliant on the cancer type. For malignant papillary thyroid cancer statistical analysis identified two receptors most useful for diagnostic purposes.

4

Polyvinylpyrrolidone-Based Coatings for Polyurethanes – The Effect of Reagent Concentration on Their Chosen Physical Properties

88%

Ciach T., Butruk B., Trzaskowski M.

Chemical and Process Engineering

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2012

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issue 4

5

Characterization of the passive films on electrodeposited Fe-Ni-Cr alloys in borate solution at pH 8.4

88%

Sziráki L., Kuzmann E., Chisholm C., El-Sharif M., Bóbics L., Stichleutner S.

Open Chemistry

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2007

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vol. 5

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issue 4

931-950

EN

The corrosion properties of the passive layers formed on iron-nickel-chromium electrodeposits of Fe29Ni51Cr20 were investigated in 0.3 M borate solution at a‘ pH of 8.4. On the basis of measurements by cyclic voltammetry, chronopotentiometry and electrochemical impedance spectroscopy, a low passive dissolution/corrosion rate was identified for the electrodeposited Fe-Ni-Cr alloys due to the nature of the established corrosion layer. The stability of this passive layer was further enhanced after corrosion under oxidizing conditions. Mössbauer spectroscopic measurements confirmed the existence of a thin passive layer on the amorphous electrodeposits. [...]

6

Laser surface remelting of powder metallurgy high-speed steel

88%

Iwaszko J., Iwaszko J.

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2020

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issue 6

7

Top down nano technologies in surface modification of materials

88%

Radjenović B., Radmilović-Radjenović M.

Open Physics

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2011

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vol. 9

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issue 2

265-275

EN

This article contains a broad overview of etch process as one of the most important top-down technologies widely used in semiconductor manufacturing and surface modification of nanostructures. In plasma etching process, the complexity comes from the introduction of new materials and from the constant reduction in dimensions of the structures in microelectronics. The emphasis was made on two types of etching processes: dry etching and wet etching illustrated by three dimensional (3D) simulation results for the etching profile evolution based on the level set method. The etching of low-k dielectrics has been demonstrated via modelling the porous materials. Finally, simulation results for the roughness formation during isotropic etching of nanocomposite materials as well as smoothing of the homogeneous materials have also been shown and analyzed. Simulation results, presented here, indicate that with shrinking microelectronic devices, plasma and wet etching interpretative and predictive modeling and simulation have become increasingly more attractive as a tool for design, control and optimization of plasma reactors.

8

Characterization of TiO2surface following the modification with silane coupling agents

75%

Jesionowski T., Siwińska-Stefańska K., Krysztafkiewicz A., Sójka-Ledakowicz J., Koprowska J., Pęczkowska B.

Polish Journal of Chemical Technology

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2007

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vol. 9

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issue 4

72-76

EN

Studies were conducted on the modification of titanium white surface using selected silane coupling agents. The effect of the concentration of the organic coupling agents was examined (0.5; 1 or 3 weight parts per 100 weight parts of TYTANPOL R-003, TYTANPOL R-211 or TYTANPOL R-213 preparation of titanium white). The dispersive properties were determined by an estimation of the particle size distribution curves and of the polydispersity index. Moreover, microscopic observations were conducted permitting to evaluate the surface morphology of the modified TiO2 particles. The profiles of sedimentation in water were also determined for the titanium whites and the BET specific surface areas were determined. Selected samples of the modified and unmodified titanium whites were subjected to elemental analysis.

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Low pressure RF plasma modification of the surface of three different nano-carbon materials

Polyvinylpyrrolidone-Based Coatings for Polyurethanes – The Effect of Reagent Concentration on Their Chosen Physical Properties

Molecular Fingerprints of Thyroid Cancer Cells by Using Library of Molecular Receptors Formed by N-Lipidated Peptides Immobilized on Cellulose

Polyvinylpyrrolidone-Based Coatings for Polyurethanes – The Effect of Reagent Concentration on Their Chosen Physical Properties

Characterization of the passive films on electrodeposited Fe-Ni-Cr alloys in borate solution at pH 8.4

Laser surface remelting of powder metallurgy high-speed steel

Top down nano technologies in surface modification of materials

Characterization of TiO2surface following the modification with silane coupling agents