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Park, Seongmin,Lim, Dongwook,Seo, Yongwon,Lee, Huen The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.42
<P>The stability of hydrate frameworks is influenced by guest molecules capable of hydrogen bonding with surrounding water molecules. Four remarkable features from the ammonium fluoride incorporation into a crystalline hydrate matrix provide important information on the thermodynamic stability, formation kinetics, structural characteristics, and molecular behavior in clathrate hydrate systems.</P> <P>Graphic Abstract</P><P>Ammonium fluoride incorporation induced structural modification showed a thermodynamic and kinetic inhibition effect of CH<SUB>4</SUB> hydrate. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc01705j'> </P>
Morpholine-Induced Thermodynamic and Kinetic Inhibitions on Gas Hydrate Formation
Park, Seongmin,Ro, Hyeyoon,Lee, Jong-Won,Kang, Hyery,Lee, Huen American Chemical Society 2013 Energy & fuels Vol.27 No.11
<P>The unexpected formation of gas hydrates during production and transportation processes in petroleum industries is known as a serious problem. To deal with this problem, the oil and gas industry has been searching for hydrate inhibitors that have great performance and cost effectiveness. Recently, ionic liquids (ILs) have been suggested as novel hydrate inhibitors that are able to act in both thermodynamic and kinetic ways (so-called dual-function inhibitors). In this paper, we suggest a non-ionic liquid compound, morpholine, as a dual-function inhibitor by measuring hydrate-phase equilibria and a series of microscopic analyses [powder X-ray diffraction, solid-state <SUP>13</SUP>C nuclear magnetic resonance (NMR), and Raman spectroscopy]. Moreover, the formation kinetics of gas hydrates in the presence of morpholine was found to be better than two comparators, 1-ethyl-3-methylimidazolium tetrafluoroborate and polyvinylpyrrolidone. Such inhibition effects of morpholine are thought to be mainly attributed to the nucleophilicity of the ring compound forming hydrogen bonds between surrounding water molecules.</P>
Seongmin Park(박성민),Wonju Jeon(전원주) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We propose a phononic beam to realize flexural wave bandgaps in wide and low frequency regimes. A unit cell of the phononic beam consists of two uniform parts and a tapered part with acoustic black hole configuration sandwiched between uniform parts. We identify the effects of geometrical parameters of the ABH-based phononic beam on band structures and determine those geometrical parameters to ob-tain a bandgap from 3.6 Hz to 237.9 Hz with a lattice constant of 1/33 wavelength. For experimental realization, the displacement transmission of the phononic beam is measured by impact hammer test, and the result shows that low transmission of -35 dB to -10 dB could be achieved in the wide bandgap.
Principles and droplet size distributions of various spraying methods: a review
Seongmin Park,박근환 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
Spraying refers to the process of forming small droplets of a liquid and dispersing them in air or on the surface of an object. Spraying is ubiquitous because it enables a liquid widely and uniformly dispersed. The existing spraying methods can be broadly categorized as ultrasonic, liquid compression, and two-phase nozzle-based. These different methods utilize different principles, with advantages and disadvantages. Thus, it is necessary to understand how different methods are suited to the applications of interest. In particular, the droplet size plays a significant role. Many studies have been conducted to characterize different spraying methods, but little systematic organization and summarization with respect to the droplet size has been done. Herein, we introduce the most widely used spraying methods and explain their spraying principles, fields of use, and appropriate operating environments. We focus on the droplet size aspect. This review is likely to be useful in the design and development of spraying devices.