Author
Miroslaw Bramowicz
Bio: Miroslaw Bramowicz is an academic researcher from University of Warmia and Mazury in Olsztyn. The author has contributed to research in topics: Fractal analysis & Surface finish. The author has an hindex of 20, co-authored 69 publications receiving 1106 citations.
Topics: Fractal analysis, Surface finish, Thin film, Materials science, Fractal
Papers published on a yearly basis
Papers
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TL;DR: An analysis of several methods of extraction of fractal parameters from the simulated, artificial surfaces and AFM images of the real, polycrystalline diamond films is presented in this paper, and the changes in the fractal dimension and the anisotropy ratio values observed over deposition time are also shown and discussed.
116 citations
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TL;DR: In this paper, the surface texture of amorphous hydrogenated carbon films with sputtered iron nanoparticles (FeNPs@a-C:H) was analyzed using a radio-frequency plasmaenhanced chemical vapor deposition method on the quartz substrates.
Abstract: This paper analyzes the three-dimensional (3D) surface texture of amorphous hydrogenated carbon films with sputtered iron nanoparticles (FeNPs@a-C:H) deposited by a radio-frequency plasma-enhanced chemical vapor deposition method on the quartz substrates. The prepared FeNPs@a-C:H films were used as research materials. The synthesized samples were deposited at four different pressures of 2.5, 3, 3.35, and 3.5 N/m2 in an acetylene gas atmosphere. The Fe and C contents of the thin films were obtained from X-ray photoelectron spectroscopy. The X-ray diffraction profile and electron diffraction pattern indicate that iron nanoparticles with body-centered-cubic crystalline structure are formed in these films. The localized surface plasmon resonance peak that is the signature of the existence of the iron core nanoparticles appears in visible spectra of these films. The sample surface images were recorded using an atomic force microscope operating in a noncontact mode and analyzed to reveal the statistical, fracta...
77 citations
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TL;DR: This work analyses the three‐dimensional surface texture of carbon–nickel films grown by radio frequency (RF) magnetron co‐sputtering on glass substrates and found that up to 180 s the sputtering occurs in more metal content mode and in greater than 180 s it occurs inMore non‐metal content mode.
Abstract: This work analyses the three-dimensional (3-D) surface texture of carbon-nickel (C-Ni) films grown by radio frequency (RF) magnetron co-sputtering on glass substrates. The C-Ni thin films were deposited under different deposition times, from 50 to 600 s, at room temperature. Atomic force microscopy was employed to characterize the 3-D surface texture data in connection with the statistical, and fractal analyses. It has been found that up to 180 s the sputtering occurs in more metal content mode and in greater than 180 s it occurs in more non-metal content mode. This behavior demonstrated a strong link between the structural and morphological properties of C-Ni composite films and facilitates a deeper understanding of structure/property relationships and surface defects in prepared samples. Furthermore, these findings can be applied to research on the mechanisms to prepare and control high-quality C-Ni films.
70 citations
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TL;DR: In this article, cobalt nanoflakes with an oxide/hydroxide surface and a conductive metallic core are grown on commercially available steel mesh modified with carbon based nanocomposites as a support layer.
Abstract: Nowadays, fossil fuel limitations and environmental concerns push researchers to find clean and renewable energy resources. Solar hydrogen production via water splitting reactions in electrochemical and/or photo-electrochemical systems has been accepted as a promising route and efficient electrocatalysts are involved in both. Here, cobalt nanoflakes with an oxide/hydroxide surface and a conductive metallic core are grown on commercially available steel mesh modified with carbon based nanocomposites as a support layer. The portion of reduced graphene oxide sheets was changed from 0 to 100 wt% and the correlation of this concentration with the surface morphology and electro-catalytic activity of the final electrode was studied systematically for the first time. Obtained results revealed the least over potential (224.2 mV) for the sample with 50 wt% rGO in the water splitting reaction which is promising for use in alkaline electrolysis devices.
69 citations
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TL;DR: In this article, sputtered gold nanoparticles (NPs) deposited by Radio Frequency-Plasma Enhanced Chemical Vapor Deposition (RF-PECVD) method on the glass substrates in trace of amorphous hydrogenated carbon (Au NPs @ a-C: H) were analyzed to study the 3D surface texture.
62 citations
Cited by
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24 Jun 2016
598 citations
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TL;DR: In this paper, the pore size distribution and 3D pore connectivity are evaluated from NMR and XCT analysis, and the NMR spectrum is also linked to the macroscopic performance, and pore network is determined from N 2 GA, and fractal theory is introduced to explain the irregularity and heterogeneity of pore throat structure characteristics.
410 citations
01 Mar 2007
379 citations
01 Jan 2002
TL;DR: It is suggested that by 2020, the number of students attending classes at the University of Southern California will have risen to about 20,000, up from about 10,000 in 1980.
Abstract: ?? ????? ??????? ??? ????????????? ?????? ??????? ???? ??????? ????????????? ??? ???????? ?? 1978 ??? ?? ????? ?????? ???? ??? ?? 1980. ??????, ??????????? ??? 2020, ??????? 17 ???? ??? ??? ??????? 25 ?????????. ?? 1995 ?? ????? ??????????? ??? ????????? ?????? ???? ??????? ??? ??????, ???? ????????????????? ??? ???????? ??? ?????? ??? ????????? ?????? 8 ??? ??????????? ??? ??? ???? ??? ?????????. ?? ???????? ??? ????? ?????? ??? ????? ????????? ?? ????? ??????? ???? ?? ?? ????? ????????? ??????????? [1] ??? ?? ?????? ??????????? ???? ???????? [2], ???????? ??? Univ. of Southern California (???).
311 citations
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TL;DR: In this paper, the authors reviewed the current progress in the adhesion qualities of HAp-based coatings on metallic biomaterials specifically for the biomedical application and found that a surface that meets the minimum unique characteristics will enhance the bonding force between the coating and the substrate.
252 citations