Wyniki wyszukiwania - Biblioteka Nauki

1

Mikroskopia sił "shear force" w badaniu topografii i właściwości emisyjnych powierzchni

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Sikora A. , Gotszalk T. , Szeloch R.

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tom Vol. 46, nr 2-3

67-68

PL

W pracy przedstawiono modularny mikroskop bliskich oddziaływań "shear force" i tunelowy, umożliwiający lokalne badanie topografii oraz właściwości emisyjnych z powierzchni. Zaprezentowano przykładowe wyniki pomiarów.

EN

In this article a modular near field-shear force microscope combined with tunneling microscope. Presented setup can be used for local electrical surface properties investigation. Some measurements results will be presented.

2

Invasive Cx43high sub-line of human prostate DU145 cells displays increased nanomechanical deformability

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Piwowarczyk K. , Sarna M. , Ryszawy D. , Czyż J.

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nr 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.

3

Analysis of the Surface Microtexture of Sputtered Indium Tin Oxide Thin Films

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Ţălu Ş. , Kulesza S. , Bramowicz M. , Stępień K. , Dastan D.

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tom Vol. 66, iss. 2

443--450

EN

The present research work involves the study of the 3-D surface microtexture of sputtered indium tin oxide (ITO) prepared on glass substrates by DC magnetron at room temperature. The samples were annealed at 450°C in air and were distributed into five groups, dependent on ambient combinations applied, as follows: I group, using argon (Ar); II group, using argon with oxygen (Ar+O2); III group, using argon with oxygen and nitrogen (Ar+O2+N2); IV group, using argon with oxygen and hydrogen (Ar+O2+H2); and V group, using argon with oxygen, nitrogen, and hydrogen (Ar+O2+N2+H2). The characterization of the ITO thin film surface microtexture was carried out by atomic force microscopy (AFM). The AFM images were stereometrically quantitatively analyzed to obtain statistical parameters, by ISO 25178-2: 2012 and ASME B46.1-2009. The results have shown that the 3-D surface microtexture parameters change in accordance with different fabrication ambient combinations.

4

Analiza wymiarów samozorganizowanych kropek kwantowych z InAs/GaAs wykonanych techniką MBE

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Kaczmarczyk M. , Piotrowski T. , Kaniewska M. , Engström O. , Pisicator J. , Sadeghi M. , Pawłowski S.

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tom Vol. 49, nr 2

39-42

PL

Samozorganizowane kropki kwantowe wykonano z InGa/GaAs na podłożu (100) GaAs metodą epitaksji z wiązek molekularnych w modzie Strańskiego-Krastanowa techniką przerywanego wzrostu. Do charakteryzacji kropek i oceny ich jednorodności wykorzystano mikroskop sił atomowych. Analiza statystyczna rozmiarów kropek wykazała bimodalny rozkład wielkości, który wskazuje na obecność dwóch grup kropek kwantowych istotnie różniących się wymiarami i gęstością. Dominująca grupa kropek miała wymiary 5,9 i 35,4 nm odpowiednio dla wysokości i średnicy, a niejednorodność w stosunku do średnich rozmiarów była na dobrym poziomie 10%. Natomiast duże kropki były bardzo nieregularne, jednak miały małą gęstość powierzchniową około 1 × 109 cm-2 i o rząd wielkości mniejszą w porównaniu do gęstości mniejszych kropek kwantowych. Technika przerywanego wzrostu w zoptymalizowanych warunkach pozwala uzyskać grupę dobrze zdefiniowanych kropek kwantowych.

EN

Self-organized InAs/GaAs quantum dots were prepared on (100) GaAs substrates by a solid source molecular beam epitaxy in Stranski-Krastanov growth mode using growth interruption technique. Atomie force microscopy was used to characterize the dots and to conclude on the dot size uniformity. Statistical analysis of the dot size variation revealed a bimodal size distribution, which indicates the presence of two dot families differing significantly in their size and density. The dominating dots were 5.9 and 35.4 nm in height and diameter, respectively and were uniform to within 10% of the average sizes. By contrast larger dots were extremely irregular however, they were fo-und at a Iow areał density of about 1 × 109 cm-2, which was one order of the magnitude lower comparing to density of the smaller dots. On the basis of the obtained results, it is concluded that the growth interruption technique is a powerful tool in obtaining well defined quantum dots when growing under optimized conditions.

5

Właściwości tribologiczne wybranych materiałów hybrydowych na bazie krzemionki

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Celichowski G.

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tom nr 2

127-140

EN

The hybrid materials are characterised by the very Iow friction coefficient (less than 0.03) which gives a chance of their application. It has been demonstrated that the hybrid ceramic-organic coating can be produced by means of the sol-gel technique. The tribological properties of these coatings can be controlled by means of modifiers that functionalise the silica or organically modified silica (for instance aminosilica). These modifications can be performed both from the liquid phase and gaseous phase, which enables implementation of the numerons substances that are tribologically active.

6

The influence of sterilization on the properties of the polyethylene used in biomedical applications

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Ziębowicz A. , Ziębowicz B. , Dziekońska M.

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tom Vol. 71, nr 2

70--76

EN

Purpose: This paper presents results of studies on the effect of the sterilization process and aging process (for comparison) on the mechanical properties and the surface quality of low density polyethylene PE-LD used in biomedical applications. Design/methodology/approach: In order to determine the changes in the surface structure of polyethylene PE-LD measurement of angle and roughness of samples were made. There were also measured mechanical properties - Shore hardness and tensile strength of PE-LD samples. Findings: Results of this study indicate that the sterilization process and the aging process does not significantly affect the mechanical properties of polyethylene. These processes influence the structure of its surface, which is very important due to the its use in medical. Practical implications: Low density polyethylene PE-LD is used in the manufacturing of laboratory equipment, such as syringes, gloves, laboratory dishes, catheters used in hemodialysis, connectors for the surgical drains, the surgical drains used in the treatment of sinuses, tracheostomy tubes. Originality/value: Results are the base for further investigations of biomedical materials. Research are essential to search for new biomedical applications for polyethylene.