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  1. 6 Progress on Chemistry and Application of Chitin and its Derivatives

  2. 5 Archives of Metallurgy and Materials

  3. 2 Open Chemistry

  4. 2 Open Physics

  5. 1 Acta Biochimica Polonica

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  1. 1 2021

  2. 3 2020

  3. 1 2019

  4. 2 2018

  5. 1 2017

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  1. 5 Lewandowska K.

  2. 2 Gotszalk T.

  3. 2 Woźniak A.

  4. 1 Adamiak M.

  5. 1 Awana V. P. S.

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1
Publication available in full text mode
Content available

Conductive atomic force microscope for investigation of thin-film gate insulators

100%
Wielgoszewski G., Gotszalk T., Woszczyna M., Zawierucha P., Zschech E.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2008
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vol. 56
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issue 1
2
Content available remote

Control of sputtering parameters for deposition of NbN thick films

100%
Jha R., Awana V. P. S.
Novel Superconducting Materials
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2015
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vol. 1
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issue 1
EN
We report a detailed study on control of sputtering parameters for synthesizing NbN superconducting thick films. The NbN films are deposited on single crystalline silicon (100) by DC reactive sputtering, i.e., deposition of Nb in the presence of reactive N2 gas. After several runs, samples were prepared with Ar:N2 partial gas ratios of 90:10, 80:20 and 70:30 for a deposition time of 10 minutes. The fabricated films (400 nm thick) crystallize with a cubic structure, with a small quantity of Nb/NbOx embedded in the main NbN phase. All three samples are characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDAX), to examine their microstructure and elemental compositional distributions, respectively. The roughness was mesured by atomic force microscopy (AFM). The optimized film prepared with Ar:N2 gas ratio of 80:20 has a Tc(R = 0) in zero and 140 kOe fields of 14.8 K and 8.8 K, respectively. The upper critical field Hc2(0) of the studied superconducting films is calculated from magneto-transport [R(T )H] measurements using GL and WHH equations.
3
Content available remote

Fibrinogen and cellular adherability on differently treated titanium as implants

88%
Fojt L., Klapetek P., Strašák L., Vetterl V.
Open Physics
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2012
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vol. 10
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issue 1
232-238
EN
Adsorption of human plasma fibrinogen, osteoblasts, and fibroblasts on differently treated titanium samples as implants were examined in this study. Titanium samples were mechanically polished, chemically etched (with and without surface material loss), and grinded. The main goal of this study is to find the best surface treatment of titanium for its possible use as implants. Atomic force microscopy was used to evaluate the adsorption of human plasma fibrinogen onto the titanium samples. Cell counting was used to determine the adherability of osteoblasts and fibroblasts on the titanium samples. Our preliminary results show that the etched titanium surface with surface material loss is the best surface treatment used in our experiments.
4
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THERMAL AND ATOMIC FORCE MICROSCOPY (AFM) STUDIES OF MICROCRYSTALLINE CHITOSAN/POLY(VINYL ALCOHOL) MIXTURES

88%
Lewandowska K.
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vol. 15
11 - 16
EN
In the present paper, the results of thermal analysis (DSC and TGA) and atomic force microscopy studies of microcrystalline chitosan (MCCh) with poly(vinyl alcohol) (PVA) are presented. Microcrystalline chitosan is blended with poly(vinyl alcohol) in acetic acid solution and this solution is cast to prepare the blend film. From thermal curves the thermal transitions: Tg, Tm and characteristic temperatures of decomposition: Tdi, Tmax have been determined and compared. The influence of the degree of PVA hydrolysis on the thermal properties of blend systems has been discussed. The surface properties of the MCCh and PVA films and their blends have been studied by tapping-mode atomic force microscopy (AFM). The changes of topography images were considered by determining the root mean square (RMS) deviation in the image data. The obtained results suggested that in solid MCCh/PVA mixtures the components are poorly miscible.
5
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Invasive Cx43high sub-line of human prostate DU145 cells displays increased nanomechanical deformability

88%
Piwowarczyk K., Sarna M., Ryszawy D., Czyż J.
Acta Biochimica Polonica
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2017
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vol. 64
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issue 3
445-449
EN
Connexin(Cx)43high cells are preferentially recruited to the invasive front of prostate cancer in vitro and in vivo. To address the involvement of Cx43 in the regulation of human prostate cancer DU145 cell invasiveness, we have analysed the nanoelasticity of invasive Cx43high sub-sets of DU145 cells by atomic force microscopy (AFM). The Cx43high DU145 cells displayed considerably higher susceptibility to mechanical distortions than the wild type DU145 cells. Transient Cx43 silencing had no effect on their elastic properties. Our data confirm the relationship between the invasive potential, Cx43 expression and nanoelasticity of the DU145 cells. However, they also show that Cx43 is not directly involved in the maintenance of DU145 invasive phenotype.
6
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ARMScope – the versatile platform for scanning probe microscopy systems

88%
Świadkowski B., Piasecki T., Rudek M., Świątkowski M., Gajewski K., Majstrzyk W., Babij M., Dzierka A., Gotszalk T., Świadkowski B., Piasecki T., Rudek M., Świątkowski M., Gajewski K., Majstrzyk W., Babij M., Dzierka A., Gotszalk T.
Metrology and Measurement Systems
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2020
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vol. 27
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issue 1
7
Content available remote

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

88%
Drobota M., Persin Z., Zemljic L., Mohan T., Stana-Kleinschek K., Doliska A., Bracic M., Ribitsch V., Harabagiu V., Coseri S.
Open Chemistry
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2013
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vol. 11
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issue 11
1786-1798
EN
The functionalization of poly(ethylene terephthalate) (PET) surface films by reactions with multifunctional amines such as triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) was investigated. For the functionalization of PET films surface we used a new way of treatment, a “sandwich model”. Physical-chemical properties of functionalized PET films were analysed. Qualitative and quantitative determination of the introduced amine groups were examined by means of Fourier Transform Infrared Attenuated Total Reflexion (FTIR - ATR), X-ray photoelectron spectroscopy (XPS), and potentiometric titration. Gained wetting properties were determined by using contact angle measurements and thoroughly analysed by acid-base approach. In addition, surface topography was investigated by atomic force microscopy (AFM). The amount of the introduced amino groups after TETA incorporation has been found to be two times higher as compared to TEPA. Wetting properties were significantly improved after aminolysis. Surface free energy was higher for PET - TETA treated film than that observed for PET - TEPA treated which is in accordance with titration results. The collagen immobilization onto PET treated films was evidenced by using AFM and subsequently by using XPS. [...]
8
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AFM study of complement system assembly initiated by antigen-antibody complex

88%
Ramanaviciene A., Snitka V., Mieliauskiene R., Kazlauskas R., Ramanavicius A.
Open Chemistry
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2006
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vol. 4
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issue 1
194-206
EN
The shape and size of complement system C1 components assembled on a SiO2 surface after classical activation by antigen-antibody complex was determined by tapping mode atomic force microscopy (AFM). The SiO2 substrate was silanized and bovine leukemia virus proteins gp51 were covalently bound to the SiO2 substrate. Self-assembly of complement system proteins was investigated by AFM. Uniform coating of silanized surface by gp51 proteins was observed by AFM. After incubation of gp51 coated substrate in anti-gp51 antibody containing solution, Ag-Ab complexes were detected on the substrate surface by AFM. Then after treatment of Ag-Ab complex modified substrate by guinea-pig blood serum containing highly active complement system proteins for 3 minutes and 30 minutes features 2–3 times and 5–8 times higher in diameter and in height if compared with those observed after formation of Ag-Ab complex, were observed respectively on the surface of SiO2. This study revealed that AFM might be applied for the imaging of complement system assembly and provides valuable information that can be used to complement other well-established techniques.
9
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PHYSICO-CHEMICAL PROPERTIES OF CHITOSAN COMPOSITES WITH SYNTHETIC POLYMERS AND INORGANIC ADDITIVES

88%
Lewandowska K.
Progress on Chemistry and Application of Chitin and its Derivatives
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2015
|
vol. 20
162-169
EN
In the present study the results of rheological measurements and atomic force microscopy (AFM) of polymer composites with montmorillonite (MMT) are presented. Chitosan is blended with synthetic polymers and inorganic additives in acetic acid solution and this solution is cast to prepare the mixture film. Flow measurements were made on a Bohlin Visco 88 rotary viscometer in the temperature range 25ºC-40ºC. The apparent shear viscosity and rheological parameters of the unmodified components and their composites were determined and discussed. Polymer films were examined using a Scanning Probe Microscopy SPM production Veeco. The obtained results suggest that the modification of several properties of polymer composites is a consequence of the interaction between the polymeric components and inorganic additives.
10
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Analysis of the Surface Microtexture of Sputtered Indium Tin Oxide Thin Films

75%
Ţălu Ş., Kulesza S., Bramowicz M., Stępień K., Dastan D., Ţălu Ş., Kulesza S., Bramowicz M., Stępień K., Dastan D.
Archives of Metallurgy and Materials
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2021
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vol. 66
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issue 2
11
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MISCIBILITY AND INTERACTIONS IN CHITOSAN AND POLYACRYLAMIDE MIXTURES

75%
Lewandowska K.
|
2014
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vol. 19
65-71
EN
In the present work, the results of Fourier transform infrared (FTIR) and atomic force microscopy (AFM) studies of films of chitosan acetate (ChA), polyacrylamide (PAM), and their mixtures are presented. The morphology of the ChA and PAM films and their mixtures was studied by tappingmode atomic force microscopy (AFM). The topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of mixtures by AFM showed a completely different morphology when compared with pure components. The roughness of mixtures increases with the increase of ChA content but is significantly reduced after UV exposure. This may indicate a strong interaction between the polymeric components. The FTIR spectroscopy also supports the obtained results. The miscibility of polymer mixtures is related to interactions between the functional groups of the polymeric components.
12
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Improvement of Microstructure and Barrier Properties of Silicate Coatings on Low Carbon Steel by Incorporating Colloidal Nano-SiO2

75%
Majdi M. R., Danaee I., Zaarei D., Farzam M., Majdi M. R., Danaee I., Zaarei D., Farzam M.
Archives of Metallurgy and Materials
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2020
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vol. 65
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issue 2
13
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Improvement of the Properties of Ti6Al7Nb Titanium Alloy in Terms of the Type of Surface Modification

75%
Woźniak A., Bialas O., Adamiak M., Woźniak A., Bialas O., Adamiak M.
Archives of Metallurgy and Materials
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2020
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vol. 65
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issue 2
14
Content available remote

Surface and interface properties of thin pentacene and parylene layers

75%
Vincze A., Jakabovič J., Srnánek R., Šatka A., Kovac J.
Open Physics
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2009
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vol. 7
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issue 2
270-278
EN
To improve Organic Thin Film Transistor (OTFT) properties we study OTFT semiconductor/dielectric interfacial properties via examination of the gate dielectric using thin Parylene C layer. Structural and morphology properties of pentacene layers deposited on parylene layer and SiO2/Si substrate structure were compared. The surface morphology was investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). AFM topography of pentacene layer in non-contact mode confirmed the preferable pentacene grain formation on parylene surface in dependence on layer thickness. The distribution of chemical species on the surfaces and composition depth profiles were measured by secondary ion mass spectroscopy (SIMS) and surface imaging. The depth profiles of the analyzed structures show a homogenous pentacene layer, characterized with C or C2 ions. Relatively sharp interface between pentacene and parylene layers was estimated by characteristic increased intensity of CCl ions peak. For revealing the pentacene phases in the structures the Micro-Raman spectroscopy was utilized. Conformal coatings of parylene and pentacene layers without pinholes resulted from the deposition process as was confirmed by SIMS surface imaging. For the pentacene layers thicker than 20 nm, both thin and bulk pentacene phases were detected by Micro-Raman spectroscopy, while for the pentacene layer thickness of 5 and 10 nm the preferable thin phase was detected. The complete characterisation of pentacene layers deposited on SiO2 and parylene surface revealed that the formation of large grains suggests 3D pentacene growth at parylene layer with small voids between grains and more than one monolayer step growth. The results will be utilized for optimization of the deposition process.
15
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SURFACE PROPERTIES OF CHITOSAN COMPOSITES WITH POLY(VINYL ALCOHOL) AND HYDROXYAPATITE

75%
Lewandowska K.
|
EN
Surface properties of composites containing chitosan (Ch), poly(vinyl alcohol) (PVA) with hydroxyapatite (HAP) were investigated by contact angle measurements and atomic force microscopy (AFM). Thin films of Ch/HAP and Ch/PVA/HAP composites have been formed by casting methods from acetic acid solutions. Measurements of the contact angle for diiodomethane (D), and glycerol (G) on the surface of chitosan films, Ch/HAP and chitosan/PVA/HAP films were made and surface free energy was calculated. It was found that chitosan/HAP or Ch/PVA/HAP blend surface is enriched in high surface energy component i.e. chitosan. The study of composites by AFM showed a completely different morphology when compared with unmodified components. The roughness of composites increase after the addition of hydroxyapatite. This may indicates a strong interaction between the polymeric components and inorganic additive.
16
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Physicochemical Properties of Oxide ZrO2 Layer Deposited by Sol-Gel Method on Ti-6Al-7Nb Alloy

75%
Woźniak A., Ziębowicz B., Ziębowicz A., Walke W.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 3
17
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SURFACE PROPERTIES OF CHITOSAN ACETATE, POLYACRYLAMIDE AND THEIR MIXTURES

75%
Lewandowska K.
Progress on Chemistry and Application of Chitin and its Derivatives
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2013
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vol. 18
|
issue 18
29-34
EN
The surface properties of chitosan acetate (ChA), polyacrylamide (PAM) and ChA/PAM mixtures have been investigated by the tapping-mode atomic force microscopy (AFM) and monitored by contact angle measurements. Chitosan is blended with polyacrylamide in acetic acid solution and this solution is cast to prepare the mixture film. Measurements of the contact angle for two different liquids (diiodomethane and glycerol) on the surface of chitosan acetate. The surface free energy (γs) as well as dispersive (gsd) and polar (gsp) components were calculated from contact angle values by Owens-Wendt methods using an appropriate computer program. The values of polar and dispersive components of surface free energy show that PAM films are more polar than chitosan acetate films. In the case of ChA/PAM mixtures, the values of surface free energy and polar component are reduced significantly compared with pure polymers. This behavior indicates rather hydrophobic character of this surface. The changes of topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of blends by AFM showed a completely different morphology when compared with pure components. The roughness of blends increases with the increase of ChA content. This may indicates a strong interaction between the polymeric components.
18
Content available remote

The Influence of Technological PVD Process Parameters on the Topography, Crystal and Molecular Structure of Nanocomposite Films Containing Palladium Nanograins

75%
Rymarczyk J., Czerwosz E., Kozłowski M., Dłużewski P., Kowalski W.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 3
18-24
EN
The paper describes the preparation and characteristics of films composed of Pd nanograins placed in carbonaceous matrix. Films were obtained in PVD (Physical Vapor Deposition) process from two sources containing: the first one - fullerene powder and the second one - palladium acetate. The topographical, morphological and structural changes due to different parameters of PVD process were studied with the use of Atomic Force Microscopy and Scanning Electron Microscopy, whereas the structure was studied with the application of the Transmission Electron Microscopy and Fourier Transform Infrared Spectroscopy methods. It was shown that topographical changes are connected with the decomposition ratio of Pd acetate as well as the form of carbonaceous matrix formed due to this decomposition. Palladium nanograins found in all films exhibit the fcc structure type and their diameter changes from 2 nm to 40 nm depending on the PVD process parameters.
19
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THROMBORESISTANT SILICON PLATES MODIFIED WITH CHITOSAN AND HEPARIN BY THE LAYER-BY-LAYER ASSEMBLY METHOD

63%
Drozd N. N., Shagdarova B. T., Zhuikova Y. V., Il’ina A. V., Vasiliev M. N., Vasilieva T. M., Hein A. M., Varlamov V. P.
Progress on Chemistry and Application of Chitin and its Derivatives
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2019
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vol. 24
5 - 22
EN
Fifteen samples of silicone plates (PlateSi, area=12 cm2), with surfaces modified layer-by-layer with chitosan and unfractionated heparin, were obtained. The sample surfaces were pre-treated by cold oxygen plasma in a planar-type plasma chemical reactor with 50 W power before coating with layered polysaccharides. Pre-treatment was carried out in two alternative operation modes of the reactor, namely in the plasma etching mode and in the reactive-ion etching mode. Thromboresistance was assessed in vitro in contact with human blood. The thromboresistant silicon plates, modified layer-by-layer (3, 5, 7, and 9 bilayers) with chitosan, with molecular weights of 65 kDa, increased with the increase in the number of layers, up to 5. An increase in the duration of thromboresistance was observed in layer-by-layer modification of the surface of the plates with chitosan with a molecular weight of 200 kDa or with quaternized chitosan with a molecular weight of 200 kDa. Some samples of highly thromboresistant, modified PlateSi contributed to the adhesion of platelets and the haemolysis of red blood cells to a lesser extent than untreated silicon plates. The three most promising samples of modified PlateSi were selected.
20
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Sustainable use of Natural Resources as Alternative for the Hazardous Corrosion Inhibitor of Mild Steel/Dilute Sulfuric Acid Interface: Weight Loss, EIS, AFM and FTIR Studies

63%
Tezeghdenti M., Etteyeb N., Dhouibi L., Kanoun O.
Archives of Metallurgy and Materials
|
2018
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vol. 63
|
issue 2
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