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    Wyświetlanie 1-6 z 6
    Tytuł:
    The impact of the light exposure on the morphological properties of selected photoresists
    Autorzy:
    Sikora, Andrzej
    Janus, Paweł
    Sierakowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/174640.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    photolitography
    polymer degradation
    atomic force microscopy
    Opis:
    In this paper we present the investigation aimed at the photoresist roughness change determination as a reliable estimator of the exposition rate in the processing verification in semiconductor industry. By employing atomic force microscopy as the 3D high resolution surface imaging tool, we tested twelve popular photoresists in terms of the morphological properties changes, while the following radiation doses were applied. Basing on high precision, and repetitive sample positioning, it was possible to perform the tests with high degree of confidence and observe the roughness change dynamics. Various profiles of roughness changes were observed, showing the need for individual study of each material. Moreover, it was possible to select the photoresists which due to poor homogeneity and small roughness changes are not suitable to such a verification. According to our knowledge, no such study was performed so far.
    Źródło:
    Optica Applicata; 2019, 49, 1; 177-185
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffuse-layer surface potentials of colemanites mined in Turkey
    Autorzy:
    Senol-Arslan, Dilek
    Drelich, Jaroslaw W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146938.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    colemanite
    surface potential
    atomic force microscopy
    boron
    DLVO
    Opis:
    Colemanite crystal specimens were handpicked at Kestelek, Emet (Hisarcik, Espey), Bigadic mines in Turkey for characterization of their composition and surface potential. X-ray diffraction analysis revealed no differences in mineralogical makeup of the crystals, but elemental analysis indicated differences in the type of trace (<0.1 wt%) elements. Zeta potential measurements showed small differences in zeta potential values, with isoelectric points (iep) varying from about pH = 9.6 to pH = 10.2. However, no correlation was found between iep and the type of trace elements. Additionally, atomic force microscopy (AFM) was employed to measure the colloidal interactions between a silicon nitride (Si3N4) cantilever tip and colemanite crystal surfaces in 1 wt% colemanite-saturated aqueous solutions at three different pHs (8.4, 9.4 and 11). The Derjaguin-Landau-Verwey-Overbeek theory (DLVO) was applied to examine the AFM tip interactions with colemanite surfaces in an aqueous solution of colemanite saturated solutions. The results revealed attractive forces at pH = 8.4 and 9.4 and repulsive forces at pH = 11, confirming the location of an isoelectric point for colemanite specimens somewhere between pH = 9.5 and pH = 10.1. Theoretical analysis of the force curves using the DLVO theory allowed for assessment of both surface charge density and surface potential for colemanite specimens used in this study.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 151933
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development and utilization of the nanomarkers for precise AFM tip positioning in the investigation of the surface morphology change
    Autorzy:
    Sikora, A
    Powiązania:
    https://bibliotekanauki.pl/articles/174750.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atomic force microscopy (AFM)
    material science
    environmental tests
    nanolithography
    nanomarker
    Opis:
    The investigation of the surface properties changes at micrometer and nanometer scale, due to the presence of various factors such as: temperature, solar radiation or magnetic field, requires suitable diagnostic methods. Atomic force microscopy (AFM) is one of the most popular measurement techniques providing necessary resolution. As complex experiments may require multiple moving of the sample between instruments and AFM, one can find quantitative comparison of the results unreliable when the measurements are performed without precise positioning of investigated surface and different areas are analyzed. In this work, the utilization of the nanoscratching method in terms of development of the nanomarkers set is presented, as the solution for precise positioning of the sample in order to perform the multi-step imaging of small surface area (1 μm×1 μm). Various materials were used to verify the versatility of the developed method. Also, the observation of the influence of the UV radiation on the polycarbonate sample was demonstrated as the example proving the application potential of the approach.
    Źródło:
    Optica Applicata; 2013, 43, 1; 163-171
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiscale water drop contact angles at selected silica surfaces
    Autorzy:
    Zhang, Chen
    Wang, Xuming
    Li, Lixia
    Jin, Jiaqi
    Polson, Randy
    Miller, Jan D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146924.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    contact angle
    atomic force microscopy
    hollow tip
    submicron-drop
    wettability
    MD simulation
    Opis:
    In this study, multiscale advancing contact angles for glycerol/water drops at silica surfaces are reported for millidrops, submicron-drops, and nanodrops. Selected silica surfaces were muscovite, silicon, and talc. The contact angles for millidrops (1–2 mm) were determined by the traditional sessile drop technique. For submicron-drops (0.1–1.0 μm), a hollow tip Atomic Force Microscope (AFM) procedure was used. The contact angles for nanodrops (~7 nm) were examined from Molecular Dynamics (MD) simulation. The results were compared to evaluate the effect of drop size on the contact angle. In the case of the hydrophobic talc surface, the 75° advancing contact angle did not vary significantly with drop size. For the hydrophilic muscovite surface, the water drop wet the surface and an advancing contact angle of about 10° was found for the millidrops and submicron-drops. However, for the MD simulated nanodrops, attachment and spreading of the ~7 nm drop created a 2D film of molecular dimensions, the contact angle of which was difficult to define and varied from 0° to 17°. Perhaps of equal interest from the MD simulation results was that the spreading of the glycerol/water nanodrop at the muscovite surface resulted in crystallographic directional transport of water molecules to the extremities of the 2D film. Such separation and segregation left the center of the film with an increased concentration of glycerol. Based on these results, the line tension, which has been found in other investigations to account for contact angle decrease with a decrease in drop size, does not seem to be a significant factor in this study.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152154
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface analysis of long-term hemodialysis catheters made of carbothane (poly(carbonate)urethane) before and after implantation in the patients’ bodies
    Autorzy:
    Nycz, M.
    Paradowska, E.
    Arkusz, K.
    Kudliński, B.
    Krasicka-Cydzik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306579.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chropowatość powierzchni
    mikroskopia sił atomowych
    mikroskopia skaningowa
    surface roughness
    atomic force microscopy
    scanning electron microscopy
    Catheter-tissue contact
    film
    Opis:
    The vascular cannulation is associated with a number of complications. The aim of this work was to study the composition and distribution of the film covering the surfaces of Mahurkar Maxid and Palindrome catheters, which were removed from the body of long-term hemodialysis patients. Moreover, the roughness and contact angle of the catheters were evaluated. Methods: Two brand new (as a reference) and thirty used catheters were the subject of the study. Their implantation period lasted from 4 months to a year and the reason for removal was the production of another vascular access or obstruction. Surfaces were analyzed by scanning electron microscope, atomic force microscope and goniometer. Results: The inner surfaces of the used catheters were covered with a film of various complexity which includes a plurality of protein, blood cell counts and the crystals. The closer to the distal part the film becomes more complex and multi-layered. Even the surfaces of brand new catheter were not completely smooth. The only significant difference between analyzed models was the presence of thrombus in the distal part of Mahurkar Maxid catheters, not in the Palindrome. Conclusions: The distal part of the catheters is the place most exposed to obstruction and infection, which may be due to not reaching the anticoagulant agent into this part. Not only the occurrence of side holes affects the formation of thrombus, but also their quantity, geometry and distribution which effect on fluid mechanics. The surface of the catheters needs to improvement to minimize the occurrence of defects and cracks.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 2; 47-53
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The MFM studies of the surface domain structure of Sm–Fe–Co–Zr–Cu thin ribbons
    Autorzy:
    Dośpiał, M
    Nabiałek, M.
    Szota, M
    Michta, Ł
    Wieczorek, P
    Błoch, K
    Pietrusiewicz, P
    Oźga, K
    Michalczyk, J
    Powiązania:
    https://bibliotekanauki.pl/articles/173524.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atomic/magnetic force microscopy (AFM/MFM)
    surface domain structure
    melt spinning method
    Sm–Co alloys
    hard magnetic magnets
    Opis:
    The article contains studies of micro- and domain structures obtained using atomic/magnetic force microscopy (AFM/MFM) of melt-spun Sm12.5Fe8Co65.5Zr1Cu13 thin ribbons in the as-cast state. In order to obtain the SmCo8.5 type of structure in the Sm–Fe–Co–Zr–Cu alloy, thin ribbons were manufactured using the melt-spinning method with large linear velocity of a copper wheel and proper selection of alloying elements. The obtained samples in the as-cast state were magnetized. The microscopic results were also supported by magnetic measurements performed on a vibrating sample magnetometer as well as by a quantitative analysis of phase composition obtained using the Rietveld refinement method.
    Źródło:
    Optica Applicata; 2013, 43, 1; 195-200
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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