PL
 |
EN
Ten serwis zostanie wyłączony 2025-02-11.
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 22

Liczba wyników na stronie
first rewind previous Strona / 2 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 2 next fast forward last
1
Surface morphology and optical properties of polymer thin films
100%
Weszka J. , Szindler M. , Bruma M.
Elektronika : konstrukcje, technologie, zastosowania
|
2012
|
tom Vol. 53, nr 6
120-122
EN
The spin coating method allows the deposition of the uniform thin films. The process is dependent primarily on the correct preparation of the solution. In view of consideration both the results of surface topography and the absorbance of the best results were obtained for the thin film deposited at 3000 rev/min. Studies on the polymers conjugated are interesting because of their possible application in the structure of polymer solar cells and dye sensitized solar cells.
2
Content available remote Investigations of morphology and optical properties of thin films of TiOPc/PTCDA donor acceptor couple
100%
Weszka J. , Jarka P. , Hajduk B. , Chwastek-Ogierman M.
Journal of Achievements in Materials and Manufacturing Engineering
|
2012
|
tom Vol. 55, nr 2
396--402
EN
Purpose: The aim of this work is studying surface topography and optical properties of organic thin films of TiOPc and PTCDA blends deposited by thermal vacuum evaporation. Design/methodology/approach: Thin films of blends of organic materials are provided as donor/acceptor couples in bulk heterojunction based organic solar cells. Thin films of TiOPc - PTCDA mixture have been deposited by thermal vacuum evaporation from one source with various ratios of blends components and deposition rates used. Both the chemical composition and technological parameters of the deposition process have appeared to influence on optical properties, UV-Vis absorption spectra in particular, and surface morphology of the as-prepared thin films. The paper reveals the methodology of deposition thin films of TiPc-PTCDA donor/ acceptor blends and the influence of deposition parameters on their properties. Findings: Thin films of such blends can be used for the research on the planar heterojunction solar cells based on donor-acceptor couple active layers. Results of these investigations suggest that blends of TiOPc and PTCDA can be suitable materials for preparing organic photovoltaic devices. Research limitations/implications: Deposition parameters and proportions of the blend components used determine the properties of TiOPc/PTCDA thin films. Originality/value: The goal of this paper is also to define relations connecting the surface morphology and optical properties of thin films of TiOPc-PTCDA blend prepared with their composition and parameters of the evaporation process.
3
Thin PPI films doped with iron (III) chloride
100%
Hajduk B. , Weszka J. , Jurasik J. , Jarząbek B.
Zeszyty Naukowe Politechniki Poznańskiej. Budowa Maszyn i Zarządzanie Produkcją
|
2007
|
tom Nr 4
65-69
EN
Optical spectra were recorded on polyazomethine thin films pristine and doped with iron (III) chloride. Doping process is seen to smear the absorption edge in UV-VJS spectra, which is attributed to polaron states formation. Positive polaron states appear within the forbidden gap of PPI, above valence band. Thopographic AFM images have shown variation in films morphology connected with surface granulation and RMS changes.
PL
W artykule przedstawiono wyniki badań optycznych wykonanych na cienkich warstwach poli-azometiny PPI, czystych i domieszkowanych chlorkiem żelaza (III). W widmach optycznych domieszkowanie powoduje rozmycie krawędzi absorpcji, które przypisuje się wytworzeniu stanów potaronowych w przerwie energetycznej polimeru. W widmie widoczne są jako progresje wi-broniczne o energii mniejszej niż szerokość pasma zabronionego. Zdjęcia topograficzne AFM wykazują że powierzchnie warstw domieszkowanej! niedomieszkowanej maja inną wielkość uziarnienia. a także różnią się współczynnikiem nierówności powierzchni RMS.
4
Content available remote Influence of solvent on the surface morphology and optoelectronic properties of a spin coated polymer thin films
100%
Weszka J. , Szindler M. M. , Szczęsna M. , Szindler M.
Journal of Achievements in Materials and Manufacturing Engineering
|
2013
|
tom Vol. 61, nr 2
302—307
EN
Purpose: The aim of this paper was to investigate changes in surface morphology and optoelectronic properties of MEH-PPV thin films. Thin films were prepared using spin coating method. Design/methodology/approach: The changes in surface topography was observed by the atomic force microscope AFM. The results of thin films roughness have been prepared in the software XEI. The UV/VIS spectrometer was used to investigate absorbance of the obtained thin films. Findings: Results and their analysis allow to conclude that the solvent, which is an important factor in spin coating technology has an influence on surface morphology and optoelectronic properties of MEH-PPV thin films. Practical implications: Known MEH-PPV optoeletronic properties and the possibility of obtaining a uniform thin film show that it can be a good material for optoelectronic and photovoltaic application. Originality/value: The paper presents some researches of MEH-PPV thin films deposited by spin coating method deposition on glass BK7. A MEH-PPV solution was prepared using three different solvents: chlorobenzene, chloroform and pyridine.
5
Content available remote Influence of LCVD technological parameters on properties of polyazomethine thin films
100%
Hajduk B. , Weszka J. , Jurusik J.
Journal of Achievements in Materials and Manufacturing Engineering
|
2009
|
tom Vol. 36, nr 1
41-48
EN
Purpose: The aim of this paper is to show influence of technological parameters (temperature and gas stream intensity) of low-temperature chemical vapour deposition (LCVD) on optical properties and morphology of polyazomethine thin films. Design/methodology/approach: Thin layers of poly (1,4-phenylene-methylenenitrilo-1,4-phenylenenitrilo-methylene) (PPI) were prepared by low temperature LCVD method with use of argon as a transport agent. The UV-Vis spectroscopy and AFM microscopy measurements on PPI thin films were performed. Findings: The LCVD parameters, like temperature and argon stream intensity, influence growth rate, morphology and optical properties of polyazomethine thin films. Optimalization of technical parameters allows for thin films with desired properties to be prepared. Research limitations/implications: Optimalization of technical LCVD parameters leads to preparing PPI thin films having desired morphology and optical properties suitable for optoelectronic applications. Practical implications: PPI polyazomethine is good material for potential applications as the active layer in optoelectronic or photonic structure (diods or photovoltaic cells). Originality/value: LCVD with use of argon is relatively new method for preparing of thin polymer films. Recognizing of optimal technical parameters will make possible getting of thin films with required properties.
6
Content available remote PEDOT:PSS thin film for photovoltaic application
100%
Weszka J. , Szindler M. , Jarka P.
Journal of Achievements in Materials and Manufacturing Engineering
|
2013
|
tom Vol. 59, nr 2
59—66
EN
Purpose: The aim of this paper was to investigate changes in surface morphology and optical parameters of thin films of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS). Thin films were prepared using spin coating method. Design/methodology/approach: The thin films of PEDOT:PSS was investigate by Raman scattering technique in Raman spectrometer. The changes in surface topography were observed with the atomic force microscope AFM XE-100. The results of roughness have been prepared in the software XEI Park Systems. The measurement of optical parameter was performed using spectrometer UV/VIS and spectroscopic ellipsometer. Findings: Results and their analysis allow to conclude that the PEDOT:PSS solution concentration and spin speed, an important factor in spin coating technology, have a significant influence on surface morphology and optical reflection of thin films. Practical implications: Knowledge about the sol gel PEDOT:PSS optical parameters and the possibility of obtaining a uniform thin films show that it can be good material for photovoltaic and optoelectronic devices. Originality/value: The paper presents some researches of PEDOT:PSS thin films deposited by spin coating method on glass substrate.
7
Content available remote Researches of topography and optical properties of the thin films NiPc/PTCDA donor acceptor couple
100%
Weszka J. , Jarka P. , Chwastek-Ogierman M. , Hajduk B.
Journal of Achievements in Materials and Manufacturing Engineering
|
2012
|
tom Vol. 53, nr 2
81--88
EN
Purpose: The aim of this work consists of researches of surface topography and optical properties of organic thin films of NiPc : PTCDA blends deposited by thermal evaporation from one source. Thin films of organic materials are provided as donor/acceptor couple in heterojuction solar cells. Design/methodology/approach: Films consisting of NiPc and PTCDA mixture were deposited by thermal evaporation from one source. By using blends with different PTCDA to NiPc ratios and steering the temperature of the sources and hence deposition rate different properties of layers are obtained. Findings: Both the chemical composition and technological parameters of deposition process has appeared to influence on optical properties and surface morphology of thin films. These parameters were found to influence surface morphology and UV-Vis absorption spectra. Research limitations/implications: The paper shows the methodology of deposition NiPc/PTCDA donor/ acceptor blends and the influence of evaporation parameters on properties of thin films. That can be used for the research of the planar heterojunction solar cells based on NiPc/PTCDA heterojunction donor-acceptor couple active layers. Practical implications: Results of researches suggest that blends of NiPc and PTCDA can be useful materials in organic photovoltaic device. However right deposition parameters and the blends proportions determine the properties of NiPc/PTCDA donor/acceptor thin films. Originality/value: The goal of this paper is to definie the surface topography and optical properties of thin films NiPc/PTCDA blends prepared with different proportions of components and parameters of evaporation process.
8
Content available remote Distribution of electronic states in amorphous Zn-P thin films on the basis of optical measurements
100%
Jarzabek B. , Weszka J. , Cisowski J.
Optica Applicata
|
2008
|
tom Vol. 38, nr 3
575-583
EN
Transmission and fundamental reflectivity studies, completed on amorphous Zn-P thin films, allowed us to obtain parameters describing the fundamental absorption edge, i.e., the optical pseudogap EG, Urbach energy EU and exponential edge parameter ET. All these data, together with the results of earlier transport measurements, have been utilized in developing simple models of electronic structure (distribution of electronic states) for amorphous Zn-P thin films of two compositions, i.e., Zn57P43 (near stoichiometry of Zn3P2) and Zn32P68 (near stoichiometry of ZnP2).
9
Content available remote Study of thin films for application in photovoltaic cells
88%
Weszka J. , Jarka P. , Jurusik J. , Domański M. , Szindler M.
Archives of Materials Science and Engineering
|
2013
|
tom Vol. 64, nr 2
182--191
EN
Purpose: of this paper: The major aim of this paper was describing technical conditions of thermal evaporation method of organic thin film used as active layers for photovoltaic cells. Design/methodology/approach: The organic thin films have been obtained by thermal evaporation process from two sources. The two sources technique alleged to using the mixtures of two kinds of materials on deposited substrate and created the bulk p-n junction. By steering the source temperature the deposited rate of substrates has been changed which has led to changes in the share component in the layer. Findings: The obtained results describe the influence of evaporation process from two sources on optical properties and surface morphology of thin films which consist molecular materials - perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and metal phthalocyanines (NiPc, TiOPc) blends. Research limitations/implications: The morphology and optical properties of thin films films made of organic materials MePc:PTCDA were described. This paper include also influence of physical vapor deposition process conditions on properties of thin films. Practical implications: The obtained results allowed to create the bulk p-n junction. The MePc:PTCDA thin films can be used in photovoltaic applications. Originality/value: The value of this paper is defining the optimal parameters of thermal evaporation from two sources for preparing MePc:PTCDA thin film with the best properties for photovoltaic applications. This paper describes the use of molecular materials for PVD technology. Results of these researches allowed to develop the technology of bulk heterojunction of molecular materials.
10
Content available remote Reconstruction of thin films polyazomethine based on microscopic images
88%
Weszka J. , Szindler M. , Śliwa A. , Hajduk B. , Jurusik J.
Archives of Materials Science and Engineering
|
2011
|
tom Vol. 48, nr 1
40-48
EN
The aim of this paper was to investigate changes in surface morphology of thin films of polyazomethine PPI. Thin films were prepared using low-temperature chemical vapor deposition (CVD) method.
11
Content available remote Influence of technological conditions on optical properties and morphology of spin-coated PPI thin films
88%
Chwastek M. , Weszka J. , Jurusik J. , Hajduk B. , Jarka P.
Archives of Materials Science and Engineering
|
2011
|
tom Vol. 48, nr 2
69-76
EN
The aim of this paper is to show technical and chemical parameters influence on optical properties and morphology of poly (1,4-phenylenemethylenenitrilo- 1,4-phenylenenitrilomethylene) (PPI) thin films prepared by spin-coating method
12
Content available remote CLSM and UV-VIS researches on polyoxadiazoles thin films
88%
Weszka J. , Szindler M. , Chwastek-Ogierman M. , Bruma M. , Jarka P.
Archives of Materials Science and Engineering
|
2012
|
tom Vol. 55, nr 2
53-61
EN
Purpose: The purpose of this paper was to analyse the surface morphology and optical properties of polyoxadiazoles thin films. Design/methodology/approach: A few different conducting polymers were dissolved in N-methyl-2-pyrrolid(in)one. Then the solutions were deposited on a glass substrate by spin coating method with a different spin rate. Changes in surface topography and optical properties were observed. A confocal laser scanning microscope CLSM Zeiss LSM 5 Exciter has been used. Photos have been taken from area of 120 x 120 microns. Findings: The analysis of images and spectra has confirmed that the quality of thin films depends upon the used polymers. It was also observed that the parameters of the spin coating method have significant effect on the morphology and the optical properties. The spin rate has got a strong impact on them. Research limitations/implications: The morphology and optical properties of polyoxadiazoles thin films has been described. This paper include description how the spin rate influence on the polymer thin films. In order to use a polymer thin film in photovoltaics or optoelectronics it must have a high internal transmission density. Further research of polymer thin films are recommended. Practical implications: The spin coating method allows to deposit a uniform thin films. It is important to know how the spin rate influence on the thin films properties. It is also important to find a new use for this group of material engineering in photovoltaic or optoelectronics devices. Originality/value: The good properties of thin films make them suitable for various applications. The value of this paper is defining the optimal parameters of spin-coating technology for polyoxadiazoles thin films. The results allow the choosing optimal parameters of the deposition process. Spin coating is a very good method to obtain thin films which are obligated to have the same thickness over the whole surface.
13
Content available remote Determining the melt flow index of polypropylene: Vistalon 404
88%
Weszka J. , Szindler M. M. , Szindler M. , Szczęsna M. , Żebracka A.
Journal of Achievements in Materials and Manufacturing Engineering
|
2013
|
tom Vol. 61, nr 2
308--314
EN
Purpose: Experimental determination using the MFR and MVR methods to obtain the most uniform material, smooth, without structural defects. Design/methodology/approach: The device used to determine the index MFR and MVR was MFlow extrusion plastometer, Zwick/Roel. The evaluation of obtained samples was carried out using a stereoscopic microscope, Zeiss, and a scanning electron microscope Supra 25, Zeiss. Determination of the chemical composition of materials was carried out by using IR spectrometer with Fourier transformation, SpectroLab. Findings: One of the requirements for quality control of thermoplastics is determination of volume and mass flow rates. To ensure in industry that production is reproducible it’s important to control this index. Practical implications: The purpose of the determination of MFR and MVR is a quick and inexpensive knowledge about the basic properties of thermoplastics processing, which is the flow rate. Knowing the material’s quality which is introduced into the manufacture makes the process parameters selection (injection molding, extrusion) much easier. It also reduces the time and minimizes the cost of the production setup. Originality/value: The MFR and MVR were experimentally determined and they have been confirmed by microscopic research. The research were focused on observing the topography changes depending on temperature.
14
Content available remote Physical properties of polyazomethine thin films doped with iodine
88%
Hajduk B. , Weszka J. , Jarząbek B. , Jurusik J. , Domański M.
Journal of Achievements in Materials and Manufacturing Engineering
|
2007
|
tom Vol. 24, nr 2
67-70
EN
Purpose: The aim of this paper is to show influence of doping 1,4-phenylene-methylenenitrilo-1,4- phenylenenitrilomethylene (PPI) with iodine and to propose doping mechanism and its impact on electronic structure of doped PPI thin films. Design/methodology/approach: Influence of iodine doping on electronic structure of polyazomethine thin films was investigated. Optical absorption spectra, XRD spectra and AFM images of doped PPI thin films were recorded. Findings: Doping mechanism relys on removing one electron from PPI pi-system by 12 molecules and forming counterions 13-. Formation of positive polaron means that doping of polyazomethine PPI is p - type. Research limitations/implications: Influence of iodine doping on electrical properties (with increasing of temperature) of PPI thin layers will be checking with Kethley appliance. We plan these measurements to be done in the foreseeable future. Practical implications: Iodine doping of thin PPI films process could results in better electrical conductivity of PPI, so doped polyazomethine films could find some applications for photonic and optoelectronic devices. Originality/value: Conjugated PPI is rarely enough reported but it is very interesting material as it has nitrogen atom in the backbone and it is isoelectronic counterpart of polyparaphenylenevinylene (PPV). This paper show that doping influences on surface morphology, cristallinity and optical properties of polymer. Furthermore, doping mechanism and changes of polymer electronic structure have been proposed in this paper.
15
Content available remote Comparing of optical properties and morphology of polyoxadiazoles with CF3 groups
75%
Hajduk B. , Jarka P. , Weszka J. , Bruma M. , Jurusik J. , Chwastek M. , Mańskowski D.
Journal of Achievements in Materials and Manufacturing Engineering
|
2010
|
tom Vol. 40, nr 1
7-14
EN
Purpose: The aim of this paper is to compare optical properties of 4-(1,1,1,3,3,3-hexafluoro-2(-4(-3(4-(5-(4-m-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenoxy)phenylcarbomyl)phenyl)propan2-yl)-N-methylbenzamide (Oxad 6F-D) and 4-(1,1,1,3,3,3-hexafluoro-2(-4-(4-(4-(5-(4-(p-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenoxycarbaomyl)phenyl)propan-2-yl)-N-methylbenzamide (Oxad 6F-E). Design/methodology/approach: The Oxad 6F polymer thin films were deposited onto glass and KBr substrates by spin–coating method under different technological conditions. Findings: The spinning rate V and solution concentration C influenced optical properties of Oxad 6F-D and Oxad 6F-E thin films. The goal of this paper is to show differences in properties of these polymers. Research limitations/implications: The electrical and luminescent properties of Oxad 6F polymers will be carried out in the nearest time. The different properties of these polymers are caused by benzene position in the polymer chain, two aromatic rings are in meta-position in Oxad 6F-D and all benzene rings are in para-positions in Oxad 6F-E. Practical implications: Thin films of Oxad 6F-D and Oxad 6F-E are good potential material for applications in polymer optoelectronic devices. Originality/value: The aim of this paper is to describe the optical properties of Oxad 6F polymers prepared under different technological conditions.
16
Content available remote Studying of polyoxadiazole with Si atom in the backbone
75%
Hajduk B. , Jarka P. , Weszka J. , Bruma M. , Jurusik J. , Chwastek M. , Mańkowski D.
Archives of Materials Science and Engineering
|
2010
|
tom Vol. 42, nr 2
77-84
EN
Purpose: The aim of this paper is to show properties of spin-coated thin films of new polymer having silicon atom in the backbone. This amorphous polymer has appeared to be applied as active films in organic devices (as OLED). Design/methodology/approach: Thin films of 4-(diphenyl(4-(4-(5-(p-tolyoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenyloamino)methyl)-phenyl)silyl)-1-methylbenzamide (Oxad–Si-B) were obtained by spin-coating method. The methodology of preparing was changing of technological parameters such as solution concentration and spinning rate V. The films were deposited with five spinning rates. Findings: Such technological parameters as spinning rate and solution concentration has appeared to influence optical properties of thin films. These parameters were found to influence surface morphology and UV-Vis absorption spectra of thin films. Research limitations/implications: The optical properties of obtained films will allow further researches of this polymer. Its optical properties allow carrying of electrical measurements, which will be carried out in the nearest time. Practical implications: The value of Oxad-Si (B) energy gap suggests its luminescent properties and applications of this material as active film in optoelectronic devices. Originality/value: The goal of this paper is to show optical properties of thin films prepared with most optimal technology conditions.
17
Some optical properties of amorphous In-Se thin films
75%
Michalewicz A. , Jarząbek B. , Cisowski J. , Jurusik J. , Burian A. M. , Weszka J.
Electron Technology
|
1998
|
tom Vol. 31, No. 3/4
411-416
EN
Studies of the optical properties of amorphous thin films of In-Se (a-In-Se) thermally evaporated from the bulk polycrystalline In2Se3 are presented. The absorption coefficient and rrefractive index are obtained from the transmission and reflectivity spectra, covering the energy range 0.4÷6.2 eV. The fundamental absorption edge, found from the tauc relation, increases from 1.64 eV to 1.73 eV, when decreasing the deposition rate from 0.7 nm/s to 16.7 nm/s. The values of refractive index are of 2.60÷2.67 and the broad peak in the reflectivity spectra at about 5 eV is thought to be attributed to the four-coordinated In atoms which are dominated in a-In-Se films under study. The surface morphology has been examineted by the atomic force microscopy (AFM) showing that the surface of the films studied is rather smooth with, however, some growth defects of density depending on the deposition conditions.
18
Content available remote Surface morphology of thin films polyoxadiazoles
75%
Weszka J. , Szindler M. M. , Chwastek-Ogierman M. , Bruma M. , Jarka P. , Tomiczek B.
Journal of Achievements in Materials and Manufacturing Engineering
|
2011
|
tom Vol. 49, nr 2
224--232
EN
Purpose: The purpose of this paper was to analyse the surface morphology of thin films polyoxadiazoles. Design/methodology/approach: SSix different polymers which belong to the group of polyoxadiazoles were dissolved in the solvent NMP. Each of these polymer was deposited on a glass substrate and a spin coating method was applied with a spin speed of 1000, 2000 and 3000 rev/min. Changes in surface topography and roughness were observed. An atomic force microscope AFM Park System has been used. Photos have been taken in noncontact mode while observing an area of 10 x 10 microns. Findings: The analysis of images has confirmed that the quality of thin films depends upon the used polymers. It was also observed that the parameters of the spin coating method have significant effect on the morphology and the surface roughness. The speed of the spin has got a strong impact on the topography of the thin films obtained. Research limitations/implications: The morphology of polyoxadiazoles thin films has been described. This paper include description how the spin speed influences the morphology of polymer thin films. In order to use a polymer thin film in photovoltaics or optoelectronics it must have a uniform thickness and a low surface roughness. Further research, in which the optical properties of thin films are investigated, is strongly recommended. Practical implications: Conductive polymers may find applications in photovoltaics or optoelectronics. It is important to study this group of material engineering and to find a new use for them. Materials from which thin films are made of will have an impact on the properties and characteristics of electronics devices in which they are be applied. Originality/value: The value of this paper is defining the optimal parameters of spin-coating technology for six polyoxadiazoles. The results allow the choosing optimal parameters of the deposition process. Spin coating is a very good method to obtain thin films which are obligated to heve the same thickness over the whole surface.
19
Content available remote Optical properties of polyazomethine with oxygen atom in the backbone
75%
Hajduk B. , Weszka J. , Cozan V. , Kaczmarczyk B. , Jarząbek B. , Domański M.
Archives of Materials Science and Engineering
|
2008
|
tom Vol. 32, nr 2
85-88
EN
Purpose: The aim of this paper is to show results of optical measurement performed on poly - (1-(4-methylenephenoxy-1)phenylene-4-methylene-1.4-phenylnenitrylomethylene) (PPI2) polyazomethine thin films and to compare with poly - (1.4-phenylenemethylenenitrilo-1.4 phenylenenitrilomethylene) (PPI). Design/methodology/approach: Influence of oxygen atom in the polymer chain on optical properties of polyazomethine was investigated. Optical UV-VIS and FTIR absorption spectra of polyazomethine PPI2 with oxygen atom were recorded and X-ray patterns of these polymers were performed. Findings: The oxygen atom incorporated in ordered way into PPI2 chain breaks conjugation and cause increase of energy gap in polymer. Research limitations/implications: The oxygen atom incorporated between phenylene rings of dialdehyde changes PPI chain into sequence of alternative three ring conjugated fragments and oxygen atoms. Practical implications: Addition of oxygen atom inside aldehyde fragment in polyazomethine chain influences conformation of polymer. The prepared layers of polyazomethine with oxygen atom in the backbone are expected to be more amorphous and more luminescent properties. Originality/value: Polyazomethine is very interesting material as it has nitrogen atom in the backbone, and is isoelectronic counterpart of polyparaphenylenevinylene (PPV). This paper shows that addition of oxygen atom into polyazomethine chain influences its optical properties.
20
Content available remote IR and microscopic studies of polyurethane surface in the Polish extracorporeal ventricular assist device POLVAD-MEV
75%
Kościelniak-Ziemniak M. , Hajduk B. , Jarka P. , Weszka J. , Kustosz R. , Kapis A. , Gonsior M.
Archives of Materials Science and Engineering
|
2014
|
tom Vol. 68, nr 1
10--19
EN
Purpose: The aim of this article is to show results of IR measurements and microscopic analysis performed on layers prepared with dissolved VAD fragments and pieces of ventricular assist devices cut out of from determined VAD sectors. Design/methodology/approach: The objects of the study have been POLVAD-MEV VADs from POLCAS system. Four ventricular assist devices POLVAD-MEV have been investigated with use M80 SPECORD IR spectrophotometer and high sensitivity Zeiss – 5 Exciter Confocal Laser Scanning Microscope equipped with a CCD camera. Findings: The carried IR and microscopic studies showed changes of VAD inner surface. All VAD polyurethane fragments had lower or higher degree of degradation, which isn’t directly connected with implantation time. Research limitations/implications: The polyurethane degradation and surface damage is probably connected with its hydrolysis. The potential effect of blood interaction with VAD inner surface was discussed. Originality/value: of this paper is spectrophotometer and microscopic studies of polyurethane surface in the polish extracorporeal ventricular assist device POLVAD-MEV.
first rewind previous Strona / 2 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.