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Application of Conducting Organic Solids for Biological Sensors: Successes and Problems

100%
Kryszewski M.
Acta Physica Polonica A
|
1995
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vol. 87
|
issue 4-5
683-698
EN
Studies on the basic properties and fabrication of biosensors based on conducting organic polymers have been reviewed. Several types of biosensors and some classes of conducting polymers used in biosensors are described. It is shown that their selective responses towards a dissolved analyte have lead to their successful application in a new generation of ion, molecular and biosensors. Some important open problems in this fast growing field have also been indicated. They are related with the complex interactions of biomolecules and/or cells with the conducting transducers. The present tendency to extreme miniaturization of biosensors related to the utilization of a few biomolecules and/or a single cell as a heart of biosensing devices seems to be very close to molecular electronics.
2
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Fifty Years of Study of the Piezoelectric Properties of Macromolecular Structured Biological Materials

100%
Kryszewski M.
Acta Physica Polonica A
|
2004
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vol. 105
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issue 4
389-408
EN
The piezoelectricity of biopolymers was discovered by E. Fukada for wood and bone in the fifties. This paper induced a number of studies on piezoelectric behaviour of bone collagen and tendon in wet and dry conditions as well as in many biological substances: polysaccharides, proteins, and biodegradable, optically active oriented films of poly(L-lactic acid). The implantation of this polymer induced the growth of bone, possibly because the ionic current caused by piezoelectric polarization stimulated the activity of bone cells. The phenomenon of bone growth has been discussed in terms of application of various substances, particularly modified collagen. The healing process of bone growth is still open both from the view of mechanism and biocompatibilities of materials used for this purpose. Fukada's group has a leading position in these studies. The fifty years of study of piezoelectricity in biomaterials resulted in many important observations and indication for further promising experimental and theoretical studies which will help to discover new ways and new materials for the tissue reconstruction.
3
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Reinforcement of Elastic Polymer Matrix Filled with Ultrafine Particles

63%
Kryszewski M., Bąk G.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 6
1163-1167
EN
The nanofiller of noble metal may modify the properties of the polymer- noble metal composite even if the concentration of the metal nanoparticles is very low. The aim of this paper is to study the influence of colloidal particles in nanocomposites. For our studies we have selected polymethyl methacrylate-palladium nanocomposite. It is shown that the effective radius of the immobilised matrix environment is much greater than the radius of the palladium particles. Due to the binding of the matrix polymer and the palladium surface some volume of the surrounding matrix becomes immobilised giving rise to the effective increase in the size of the palladium filler. The analysis of a few models of nanocomposites used for interpretation of the mechanical properties has also been presented.
4
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Temperature Dependence of Properties of Heterojunctions of Some TCNQ Salts in Polymer Matrices with p- or n-Doped Silicon

45%
Jeszka J. K., Tracz A., Boiteux G., Seytre G., Kryszewski M.
Acta Physica Polonica A
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1995
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vol. 88
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issue 3
533-541
EN
The temperature dependence of the electrical properties of heterojunctions with silicon formed by conductive organic polymer composites with networks of two complex tetracyanoquinodimethane salts (of N-n-butyl-isoquinolinium and of diethyl methyl sulphonium cations) were studied. We show that it is possible to prepare junctions with quite good rectifying properties, comparable to those obtained using other organic semiconductors. The observed forward-bias current-voltage characteristics can be satisfactorily fitted using the modified Schottky equation. Reverse bias and C-V characteristics show that the transport mechanism, especially in the case of p-Si junctions is more complicated and probably tunnelling between localized levels plays an important role.
5
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D.C. Conductivity of Polymer Composites with (BEDT-TTF)_{2}I_{3} Superconductor

39%
Ulański J., Jeszka J., Polanowski P., Głowacki I., Kryszewski M., Staerk D., Helberg H.
Acta Physica Polonica A
|
1995
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vol. 87
|
issue 4-5
899-903
EN
Electrical properties of conducting reticulate doped polymeric films con­taining BEDT-TTF iodide crystalline network were investigated. Conditions of preparation of this kind of films i.e. time of doping by iodine vapours and time and temperature of annealing and their influence on transformation of the BEDT-TTF iodide crystallites into superconducting phase are discussed.
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