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Journal articles on the topic 'Surface processes'

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Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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1

Veress, Márton, and Kálmán Péntek. "Theoretical model of surface karstic processes." Zeitschrift für Geomorphologie 40, no. 4 (December 12, 1996): 461–76. http://dx.doi.org/10.1127/zfg/40/1996/461.

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2

Turanska, S. P., N. V. Opanaschuk, N. M. Kusyak, V. V. Turov, P. P. Gorbyk, D. B. Kargin, and M. Z. Kokarev. "Adsorption processes in accumulation, separation and use of rare earth elements." Surface 8(23) (December 30, 2016): 187–217. http://dx.doi.org/10.15407/surface.2016.08.187.

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3

Nicklin, C. "Capturing Surface Processes." Science 343, no. 6172 (February 13, 2014): 739–40. http://dx.doi.org/10.1126/science.1250472.

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4

Pelletier, Jon. "Planetary surface processes." Meteoritics & Planetary Science 47, no. 10 (October 2012): 1692–93. http://dx.doi.org/10.1111/j.1945-5100.2012.01423.x.

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5

Syvitski, James P. M. "Earth surface processes." Sedimentary Geology 117, no. 3-4 (May 1998): 247–48. http://dx.doi.org/10.1016/s0037-0738(98)90005-7.

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6

Plescia, J. B., J. Cahill, B. Greenhagen, P. Hayne, P. Mahanti, M. S. Robinson, P. D. Spudis, et al. "Lunar Surface Processes." Reviews in Mineralogy and Geochemistry 89, no. 1 (December 1, 2023): 651–90. http://dx.doi.org/10.2138/rmg.2023.89.15.

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7

Zolotarenko, O. D., O. P. Rudakova, M. T. Kartel, H. O. Kaleniuk, A. D. Zolotarenko, D. V. Schur, and Yu O. Tarasenko. "The mechanism of forming carbon nanostructures by electric arc-method." Surface 12(27) (December 30, 2020): 263–88. http://dx.doi.org/10.15407/surface.2020.12.263.

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The regularities of the formation of nanostructures during the evaporation of graphite by the electric ARC – method are studied. Described physicochemical processes in the synthesis reactor . At plasma temperatures taking into account the behavior of particles in electromagnetic fields with extreme temperature and pressure grants. A sequence of organization of matter in the process of forming a structure according to nano-dimensional characteristics is proposed. The self-organization of systems during electric arc evaporation of graphite or graphite-containing electrodes has been studied. The mechanisms of formation of soluble (fullerenes and fullerene-like structures) and insoluble (nanocomposites, CNTs, graphenes) carbon nanostructures are considered. The processes occurring in the electric arc synthesis reactor are analyzed: the process of distribution of charged particles in an electric arc at different times; processes taking place at the anode; the mechanism of carbon vapor formation during graphite evaporation; processes in the gas phase and on the walls of the reactor under the conditions of an electric arc discharge; model of the reactor space zones; formation of carbon nanostructures in the gas phase and on the inner surface of the reactor. use of doped electrodes and metal inserts (sleeves) as catalysts for the synthesis of carbon nanostructures. The sequence of processes in the formation of spherical carbon molecules is studied, and the processes and structural transformations are considered. In the research work, the products (fullerenes and fullerene-like structures, nanocomposites, VNT, graphenes) of electric arc synthesis are presented, and modern methods of analysis are used for their fixation and identification.

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8

Buch, V., and J. P. Devlin. "Modeling of interstellar surface processes." Symposium - International Astronomical Union 178 (1997): 321–30. http://dx.doi.org/10.1017/s0074180900009463.

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Computational modeling is discussed of some interstellar surface processes. The surface of interstellar grains is envisaged as covered by at least several layers of weakly bonded molecular material. Simulated amorphous ice particles were used to model interaction of such surfaces with gas, including sticking of H and D atoms, and adsorption of H2. A possibility of microporosity of interstellar ice mantles is discussed.

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9

Shiou, Fang-Jung, and Assefa Asmare Tsegaw. "Ultra Precision Surface Finishing Processes." International Journal of Automation Technology 13, no. 2 (March 5, 2019): 174–84. http://dx.doi.org/10.20965/ijat.2019.p0174.

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Surfaces of different complex shapes are aspirated part of many scientific measuring devices, medical, astronomical, and other precision activity utilizations. Components at miniaturized level should meet required surface roughness for the intended applications. Surface finishing of freeform and miniaturized components are always difficult and need to look for a new way out. In this study, an attempt was made to improve surfaces roughness of selected, most frequently used, engineering materials using different innovative processes, which can be integrated with CNC machine centers. An advanced automated surface finishing tools such as ball burnishing embedded with load cell, vibration assisted polishing, and self-propelled abrasive multi-jet polishing tools are proposed. Ball burnishing is advantageous for pre-machining process of ball polishing. Using the polishing device embedded with load cell, the constant force polishing is achieved. To reduce the volumetric wear of a polishing ball, vibration assisted polishing device is also integrated. Moreover, self-propelled abrasive multi-jet polishing tool, which achieves 93.33% improvement of surface roughness for lapped optical glass of BK7 has been subjugated from Ra 0.300 μm to 0.020 μm. These tools can be miniaturized and applicable in small micro CNC machining centers.

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10

Kinouchi, Yuki, Masahiko Yoshino, Hiroyuki Miyasaka, Nayuta Minami, Tomoyuki Takahashi, and Noritsugu Umehara. "Nano Forming Process for Functional Surface(M^4 processes and micro-manufacturing for science)." Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2005.2 (2005): 849–54. http://dx.doi.org/10.1299/jsmelem.2005.2.849.

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11

Kasemo, B., and J. Gold. "Implant Surfaces and Interface Processes." Advances in Dental Research 13, no. 1 (June 1999): 8–20. http://dx.doi.org/10.1177/08959374990130011901.

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The past decades and current R&D of biomaterials and medical implants show some general trends. One major trend is an increased degree of functionalization of the material surface, better to meet the demands of the biological host system. While the biomaterials of the past and those in current use are essentially bulk materials (metals, ceramics, polymers) or special compounds (bioglasses), possibly with some additional coating (e.g., hydroxyapatite), the current R&D on surface modifications points toward much more complex and multifunctional surfaces for the future. Such surface modifications can be divided into three classes, one aiming toward an optimized three-dimensional physical micro-architecture of the surface (pore size distributions, "roughness", etc.), the second one focusing on the (bio) chemical properties of surface coatings and impregnations (ion release, multi-layer coatings, coatings with biomolecules, controlled drug release, etc.), and the third one dealing with the viscoelastic properties (or more generally the micromechanical properties) of material surfaces. These properties are expected to affect the interfacial processes cooperatively, i.e., there are likely synergistic effects between and among them: The surface is "recognized" by the biological system through the combined chemical and topographic pattern of the surface, and the viscoelastic properties. In this presentation, the development indicated above is discussed briefly, and current R&D in this area is illustrated with a number of examples from our own research. The latter include micro- and nanofabrication of surface patterns and topographies by the use of laser machining, photolithographic techniques, and electron beam and colloidal lithographies to produce controlled structures on implant surfaces in the size range 10 nm to 100 μm. Examples of biochemical modifications include mono- or lipid membranes and protein coatings on different surfaces. A new method to evaluate, e.g., biomaterial-protein and biomaterial-cell interactions-the Quartz Crystal Microbalance-is described briefly.

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12

Jonsson, H. "Simulation of surface processes." Proceedings of the National Academy of Sciences 108, no. 3 (January 3, 2011): 944–49. http://dx.doi.org/10.1073/pnas.1006670108.

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13

Knat’ko, M. V., and M. N. Lapushkin. "New surface ionization processes." Technical Physics 58, no. 6 (June 2013): 827–35. http://dx.doi.org/10.1134/s1063784213060170.

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14

Peter, Laurence. "Surface electron transfer processes." Journal of Electroanalytical Chemistry 421, no. 1-2 (January 1997): 226. http://dx.doi.org/10.1016/s0022-0728(97)80107-6.

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15

Kreuzer, H. J. "Theory of surface processes." Surface Science 231, no. 1-2 (May 1990): 213–26. http://dx.doi.org/10.1016/0039-6028(90)90714-j.

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16

Kreuzer, H. J. "Theory of surface processes." Applied Physics A Solids and Surfaces 51, no. 6 (December 1990): 491–97. http://dx.doi.org/10.1007/bf00324732.

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17

N.S. Allen. "Surface electron transfer processes." Journal of Photochemistry and Photobiology A: Chemistry 98, no. 3 (August 1996): 187. http://dx.doi.org/10.1016/1010-6030(96)84427-3.

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18

Lifshits, Victor G., Yury L. Gavrilyuk, Dmitry A. Tsukanov, Boris K. Churusov, Namjil Enebish, Svetlana V. Kuznetsova, Serguei V. Ryjkov, Dmitriy Gruznev, and Chiei Tatsuyama. "Surface Phases and Processes on Si Surface." e-Journal of Surface Science and Nanotechnology 2 (2004): 56–76. http://dx.doi.org/10.1380/ejssnt.2004.56.

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19

ROTERMUND, Harm Hinrich. "Surface Imaging of Surface Non-linear Processes." Hyomen Kagaku 29, no. 5 (2008): 279–83. http://dx.doi.org/10.1380/jsssj.29.279.

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20

Chen, Xun. "Corrective Abrasive Polishing Processes for Freeform Surface." Key Engineering Materials 404 (January 2009): 103–12. http://dx.doi.org/10.4028/www.scientific.net/kem.404.103.

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Traditionally, abrasive finishing process only focused on producing excellent surface finish on regular form shapes. Ever increasing demands in freeform features in aerospace, energy and medicine applications require abrasive finishing technology not only provides excellent surface finish but also is capable to correct the errors on freeform surfaces. The paper presents current development of corrective polishing technology for freeform surfaces.

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21

Jamaladdin Aslanov, Jamaladdin Aslanov. "MECHANICAL PROCESSES IN TRIBOTECHNICAL UNITS." ETM - Equipment, Technologies, Materials 08, no. 04 (September 26, 2021): 04–09. http://dx.doi.org/10.36962/etm08.04.202104.

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The study examined the diffusion phenomenon caused by compressive forces in tribotechnical nodes adhering to each other under high contact pressure and the mechanism of rupture of surfaces during surface fatigue. As a result, for two metal surfaces, depending on the nature of the touch, the gravitational and repulsive forces generated during the interaction in any environment are determined based on the number of touches and an analytical expression is obtained to calculate them. Keywords: tribotechnical knot, mutual contact, diffusion phenomenon, surface attraction, molecular contact, mechanical contact.

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22

Assouline, S., G. Govers, and M. A. Nearing. "Erosion and Lateral Surface Processes." Vadose Zone Journal 16, no. 12 (December 2017): vzj2017.11.0194. http://dx.doi.org/10.2136/vzj2017.11.0194.

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23

Allen, Philip A. "Surface impact of mantle processes." Nature Geoscience 4, no. 8 (July 10, 2011): 498–99. http://dx.doi.org/10.1038/ngeo1216.

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24

TANAKA, Sachi, Joichi SUGIMURA, and Yuji YAMAMOTO. "Surface Deformation in Wear Processes." Proceedings of Conference of Kyushu Branch 2003.56 (2003): 219–20. http://dx.doi.org/10.1299/jsmekyushu.2003.56.219.

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25

Shroder, John F. "Developments in earth surface processes." Geomorphology 51, no. 4 (April 2003): 331. http://dx.doi.org/10.1016/s0169-555x(03)00088-6.

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26

Asscher, Micha, and Yehuda Zeiri. "Surface Processes Induced by Collisions." Journal of Physical Chemistry B 107, no. 29 (July 2003): 6903–19. http://dx.doi.org/10.1021/jp022099x.

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27

Schulze, Volker, Frederik Zanger, Benedict Stampfer, Jörg Seewig, Julian Uebel, Andreas Zabel, Bernd Wolter, and David Böttger. "Surface conditioning in machining processes." tm - Technisches Messen 87, no. 11 (November 26, 2020): 661–73. http://dx.doi.org/10.1515/teme-2020-0044.

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28

Schulze, Volker. "Surface conditioning in machining processes." tm - Technisches Messen 87, no. 11 (November 26, 2020): 659–60. http://dx.doi.org/10.1515/teme-2020-0069.

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29

Schulze, Volker. "Surface conditioning in machining processes." tm - Technisches Messen 87, no. 12 (November 18, 2020): 743–44. http://dx.doi.org/10.1515/teme-2020-0071.

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30

MABOUDIAN, R. "Surface processes in MEMS technology." Surface Science Reports 30, no. 6-8 (1998): 207–69. http://dx.doi.org/10.1016/s0167-5729(97)00014-9.

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31

Antczak, Grazyna, and Gert Ehrlich. "Jump processes in surface diffusion." Surface Science Reports 62, no. 2 (February 2007): 39–61. http://dx.doi.org/10.1016/j.surfrep.2006.12.001.

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32

Tsong, Tien T. "Energetics of surface atomic processes." Surface Science 231, no. 1-2 (May 1990): 81–89. http://dx.doi.org/10.1016/0039-6028(90)90694-4.

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33

Shin, Jaeoh, and Anatoly B. Kolomeisky. "Surface-Assisted Dynamic Search Processes." Journal of Physical Chemistry B 122, no. 8 (February 16, 2018): 2243–50. http://dx.doi.org/10.1021/acs.jpcb.7b11958.

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34

Schultz, Colin. "Surface Ocean–Lower Atmosphere Processes." Eos, Transactions American Geophysical Union 92, no. 7 (February 15, 2011): 57. http://dx.doi.org/10.1029/2011eo070009.

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35

Shoham, Moshe, and Rajan Srivatsan. "Automation of surface finishing processes." Robotics and Computer-Integrated Manufacturing 9, no. 3 (June 1992): 219–26. http://dx.doi.org/10.1016/0736-5845(92)90026-3.

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36

Jacobs, Gregg A., Helga S. Huntley, A. D. Kirwan, Bruce L. Lipphardt, Timothy Campbell, Travis Smith, Kacey Edwards, and Brent Bartels. "Ocean processes underlying surface clustering." Journal of Geophysical Research: Oceans 121, no. 1 (January 2016): 180–97. http://dx.doi.org/10.1002/2015jc011140.

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37

KAWAMURA, Kohei, Shuichi ISHIZUKA, Hiroyuki SAKAUE, and Yasuhiro HORIIKE. "Si Processes and Si-H Surface. Studies on Surface Reaction Processes Using FTIR-ATR." Hyomen Kagaku 13, no. 6 (1992): 358–64. http://dx.doi.org/10.1380/jsssj.13.6_358.

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38

Ventzek, Peter, Shyam Sridhar, Ya-Ming Chen, Roberto Longo, Gregory Hartmann, Jianping Zhao, Jun Shinagawa, and Zhiying Chen. "(Invited) Surface Chemistry Control in Advanced Plasma Processes." ECS Meeting Abstracts MA2022-02, no. 18 (October 9, 2022): 864. http://dx.doi.org/10.1149/ma2022-0218864mtgabs.

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Atomic scale control in fabrication steps for advanced logic and memory manufacture is critical not only for manufacturing viability of widely disparate structures but also functionality of complex devices. Different approaches ranging from the use of “tighter” process control options to leveraging self-limiting cyclic processing have been explored to achieve atomic scale control utilizing seemingly unwieldy plasmas. Process technology is married to plasma as the most capable methods of delivering area selective etch or low temperature selective deposition. A hindrance for advancing the control of plasma modified surfaces is that plasmas modify surfaces resulting in non-ideal states. Current process engineering can accommodate less-than-ideal surfaces; however, even in the best case, managing non-idealities introduces significant complexity. The use of first principles in-situ diagnostics and simulation together provides a path towards increased understanding of plasma-surface interactions and atomic scale control of the surface and sub-surface. Physisorption-mediated plasma processes are useful to illustrate the combination of quantum chemistry and in-situ diagnostics as the etch precursor is delivered to the surface in an unfragmented state. The presentation will include examples of how this system can be used to gain an understanding of the sensitivity of processes to different types of surfaces. It will conclude with forward looking content related to the de-cluttering of plasma processes using new learning concepts.

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39

de Giudici, Giovanni, Marco Voltolini, and Massimo Moret. "Microscopic surface processes observed during the oxidative dissolution of sphalerite." European Journal of Mineralogy 14, no. 4 (July 17, 2002): 757–62. http://dx.doi.org/10.1127/0935-1221/2002/0014-0757.

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40

Cîrstoiu, Adriana. "Surface Roughness Prediction Techniques in Turning Processes." Scientific Bulletin of Valahia University - Materials and Mechanics 20, no. 22 (April 1, 2024): 42–45. http://dx.doi.org/10.2478/bsmm-2024-0008.

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Abstract Measuring and characterizing surface properties represents one of the most important aspects in manufacturing processes. In this paper, it has been shown that the factorial design of experiments combined with regression techniques can be applied to evaluate the roughness of machined surfaces with different cutting parameters.

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41

Beamson, G., W. J. Brennan, D. T. Clark, and J. Howard. "Modification of Surfaces and Surface Layers by Non Equilibrium Processes." Physica Scripta T23 (January 1, 1988): 249–57. http://dx.doi.org/10.1088/0031-8949/1988/t23/047.

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42

Lifshits, V. G., V. B. Akilov, B. K. Churusov, and Yu L. Gavriljuk. "The role of surface phases in processes on silicon surfaces." Surface Science 222, no. 1 (November 1989): 21–30. http://dx.doi.org/10.1016/0039-6028(89)90331-2.

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43

Lifshits, V. G., V. B. Akilov, B. K. Churusov, and Yu L. Gavriljuk. "The role of surface phases in processes on silicon surfaces." Surface Science Letters 222, no. 1 (November 1989): A540. http://dx.doi.org/10.1016/0167-2584(89)90188-6.

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44

Su, Z., H. Pelgrum, and M. Menenti. "Aggregation effects of surface heterogeneity in land surface processes." Hydrology and Earth System Sciences 3, no. 4 (December 31, 1999): 549–63. http://dx.doi.org/10.5194/hess-3-549-1999.

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Abstract. In order to investigate the aggregation effects of surface heterogeneity in land surface processes we have adapted a theory of aggregation. Two strategies have been adopted: 1) Aggregation of radiative fluxes. The aggregated radiative fluxes are used to derive input parameters that are then used to calculate the aerodynamic fluxes at different aggregation levels. This is equivalent to observing the same area at different resolutions using a certain remote sensor, and then calculating the aerodynamic fluxes correspondingly. 2) Aggregation of aerodynamic fluxes calculated at the original observation scale to different aggregation levels. A case study has been conducted to identify the effects of aggregation on areal estimates of sensible and latent heat fluxes. The length scales of surface variables in heterogeneous landscapes are estimated by means of wavelet analysis.

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45

SEYAMA, Haruhiko, and Mitsuyuki SOMA. "Surface-analytical Studies on Environmental and Geochemical Surface Processes." Analytical Sciences 19, no. 4 (2003): 487–97. http://dx.doi.org/10.2116/analsci.19.487.

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46

Synytsia, A. O., O. E. Sych, V. S. Zenkov, O. I. Khomenko, V. G. Kolesnichenko, T. E. Babutina, and I. G. Kondratenko. "Investigation of water vapor adsorption kinetics on hydroxyapatite/magnetite/chitosan biocomposites." Surface 15(30) (December 30, 2023): 97–109. http://dx.doi.org/10.15407/surface.2023.15.097.

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The work is devoted to the investigation of the morphology and adsorption properties of powder composites based on biogenic hydroxyapatite modified by magnetite (1, 5, 25, 50 wt. %) of various types (synthesis methods) and chitosan. The morphology of the powders evaluated using SEM micrographs and AMIS software is characterized by a uniform distribution of particles size and shape. It was established that the use of magnetite synthesized by chemical precipitation in the amount of 1-5% allows to obtain composite materials with a particle size in a narrower size range. Analysis of the kinetics of adsorption-desorption processes showed that the adsorption of water vapor is directly related to the ratio of hydroxyapatite and magnetite, increasing with increasing magnetite content. In addition, it is shown that the adsorption process for composites modified by magnetite obtained by the chemical precipitation method proceeds uniformly, while for composites containing magnetite obtained by the thermal decomposition method, three consecutive stages of the adsorption process are characteristic: rapid linear increase in mass, gradual inhibition of the adsorption process and stabilization of the mass of the material. The evaluation of the increase in mass also indicates a connection with the ratio of hydroxyapatite and magnetite, increasing with increasing magnetite content, which confirms the presence of physicochemical processes of interaction of gas molecules with the active centers of the molecules of the studied materials. DTGA also shows that the type of magnetite in an amount of more than 25% significantly affects the mass loss of composites during heat treatment up to 1000 °C, which is related to the initial characteristics of the magnetite used. The presented results in combination with previously obtained physicomechanical and biochemical properties testify to the prospects of biogenic hydroxyapatite/magnetite/chitosan composite materials for medicine.

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47

Sidun, Jarosław, and Jan Ryszard Dąbrowski. "Bone Ingrowth Processes on Porous Metalic Implants." Solid State Phenomena 147-149 (January 2009): 776–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.776.

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The surface of an endosseous implant has fundamental importance in forming mechanical and chemical connection with osseous tissue. One of the methods of enlarging area is using technology of powder metallurgy. The paper presents research regarding osteointegration of porous materials for implants made for Co-Cr-Mo and titanium with Bioglass type-S2. The research was made on the castrated goats averaging one year of age, from this oneself herds. Bone growth process on surfaces of implants made with additional bioglass was significantly intense. The amount of osseous tissue and the number of connection points are significantly increased. On surfaces of titanium implants few areas of stochastic callus formation were observed. In that case areas of preferential bone integration have uneven surface due to technological process. A significant difference appears in osseous tissue growth morphology on implant surface. In porous implants bone grows around the pores of an implant. The obtained results showed that porosity influences callus growth intensity beneficially on the implant structure. Use of bioglass increases bone growth intensity on implant surface.

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48

Mazzitelli, C., M. Ferrari, M. Toledano, E. Osorio, F. Monticelli, and R. Osorio. "Surface Roughness Analysis of Fiber Post Conditioning Processes." Journal of Dental Research 87, no. 2 (February 2008): 186–90. http://dx.doi.org/10.1177/154405910808700204.

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The chemo-mechanical surface treatment of fiber posts increases their bonding properties. The combined use of atomic force and confocal microscopy allows for the assessment and quantification of the changes on surface roughness that justify this behavior. Quartz fiber posts were conditioned with different chemicals, as well as by sandblasting, and by an industrial silicate/silane coating. We analyzed post surfaces by atomic force microscopy, recording average roughness (Ra) measurements of fibers and resin matrix. A confocal image profiler allowed for the quantitative assessment of the average superficial roughness (Ra). Hydrofluoric acid, potassium permanganate, sodium ethoxide, and sandblasting increased post surface roughness. Modifications of the epoxy resin matrix occurred after the surface pre-treatments. Hydrofluoric acid affected the superficial texture of quartz fibers. Surface-conditioning procedures that selectively react with the epoxy-resin matrix of the fiber post enhance roughness and improve the surface area available for adhesion by creating micro-retentive spaces without affecting the post’s inner structure.

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49

Redfern, Thomas W., Neil Macdonald, Thomas R. Kjeldsen, James D. Miller, and Nick Reynard. "Current understanding of hydrological processes on common urban surfaces." Progress in Physical Geography: Earth and Environment 40, no. 5 (August 3, 2016): 699–713. http://dx.doi.org/10.1177/0309133316652819.

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Understanding the rainfall-runoff behaviour of urban land surfaces is an important scientific and practical issue as storm water management policies increasingly aim to manage flood risk at local scales within urban areas, whilst controlling the quality and quantity of runoff that reaches receiving water bodies. By reviewing field measurements reported within the literature on runoff, infiltration, evaporation and storage on common urban surfaces, this study describes a complex hydrological behaviour with greater rates of infiltration than often assumed, contradicting a commonly adopted, but simplified classification of the hydrological properties of urban surfaces. This shows that the term impervious surface, or impermeable surface, referring to all constructed surfaces (e.g. roads, roofs, footpaths, etc.) is inaccurate and potentially misleading. The hydrological character of urban surfaces is not stable through time, with both short (seasonal) and long term (decadal) changes in hydrological behaviour, as surfaces respond to variations in seasonal characteristics and degradation in surface condition. At present these changing factors are not widely incorporated into hydrological modelling or urban surface water management planning, with static values describing runoff and assumptions of imperviousness often used. Developing a greater understanding of the linkages between urban surfaces and hydrological behaviour will improve the representation of diverse urban landscapes within hydrological models.

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50

Sigareva, N. V., B. M. Gorelov, and S. V. Shulga. "Еffect of graphene filler oxidation on the thermal destruction of epoxy-graphene composites." Surface 13(28) (December 30, 2021): 166–74. http://dx.doi.org/10.15407/surface.2021.13.166.

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Abstract:

The participation of the electronic subsystem of graphene nanoparticles in heat transfer on the interfaphase surface with epoxy polymer, its participation in the thermodestruction processes of epoxy matrix and the concentration interval of the subsystem's influence on the thermal destruction of the polymer matrix are investigated. For such purpose, epoxy resin composites with oxidized and non-oxidized graphene nanoparticles have been used.The particles were obtained by electrochemical method and those are characterized by the same dispersion and analogical of defect spectra. The particles have the same crystal structure, however in composites with oxidized graphene, the participation of the electronic subsystem in thermophysical processes on the interfacial surface is blocked by the atomic layer of adsorbed oxygen. Сomposites of epoxy resin filled with the same particles of nonoxidized and oxidized nanoparticles in the filler content 0.0, 1.0, 2.0, and 5.0 wt%. The multilayered graphene particles were studied by X-ray diffraction analysis (XRD) and Raman spectroscopy (RS) methods. It was shown that the graphene particles are the 2D dimensional structures with about of 100 layers. Desorption curves of epoxy and its composites have been obtained using a programmable thermal desorption mass-spectroscopic (TDMS) technique for fragments with 15≤ m/z ≤108 and temperature interval 35 - 800 оС. The activation energy of desorption was determined from the Wigner-Polanyi equation as 35 - 150 kJ/mol, temperature and mass dependences of the quantity of desorbed atomic fragments have been calculated. It were established the graphene electron subsystem takes part in polymer structure thermodestruction for epoxy composites with nonoxidized graphene enhancing their heat resistance at graphene content С ≤ 1 wt%. With increasing filler content, the thermodestruction behavior in pristine epoxy and its composites with nonoxidized and oxidized graphene is analogical. The thermodestruction characterizes by the stepwise variations in the desorption intensity of atomic fragments. The electron subsystem of graphene particles does not participate in the heat resistance variations.

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