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The Correlation Between Elastic Properties and AFM Images of Nanocoatings on Polymers

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Gümüş S., Polat Ş., Lackner J., Waldhauser W.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1142-1144
EN
In a biomimetic approach for designing implants, both the physical properties (such as topography, elasticity, roughness, hydrophilicity, charges etc.) and the chemical structure of the artificial biomaterial should be considered, since they affect the adhesion of proteins in the nanometer-scale and of the cells in micro-scale at the interface. In this case, surface modification of biomaterials plays a major role because of the expectations from the material surface. These may be realized by changing the surface chemistry, physically or chemically, or by coating it with a material having a certain chemical composition. In this study, surface properties like topography and roughness, and mechanical properties like elastic modulus and hardness are determined for nanocoated materials.
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A Product Operator Theory of DEPTQ NMR Spectroscopy for IS_{n} (I = 1/2; S = 1; n = 0, 1, 2, 3) Spin Systems

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Şaka İ., Gençten A., Gümüş S.
Acta Physica Polonica A
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2011
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vol. 120
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issue 3
541-544
EN
Distortionless enhancement by polarization transfer including the detection of quaternary nuclei is a carbon-editing pulse NMR experiment. In this experiment multiplicity information for all carbons including quaternary carbons are obtained. In the present study, analytical descriptions of DEPTQ NMR experiment have been investigated for weakly coupled IS_{n} (I = 1/2; S = 1; n = 0, 1, 2, 3) spin systems by using the product operator theory. Then, the theoretical discussion and the experimental suggestions for sub-spectral editing of C, CD, CD_2 and CD_3 groups have been presented. The comparison of the obtained results with those of the basic distortionless enhancement by polarization transfer NMR experiment has been also performed for CD_{n} groups. It is shown that DEPTQ experiment can be also used for CD_{n} groups.
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