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Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Zeolitic imidazolate framework (ZIF)-based membranes are emerging materials that are highlyattractive for gas separation and purification. Highly reproducible defect-free ZIF membranes with well-defined pore structures can be formed in a number of ways. The performance of ZIF membranes dependslargely on the preparation technique, application type, and operating conditions. Here, we review themethods of ZIF membrane preparation and discuss their performance in separating condensable andincondensable gases. In addition, recent developments in membrane synthesis and ways to improve thegas separation performance of ZIF membranes are discussed to promote industrial application andcommercialization of ZIF membranes.
Highly selective micro-porous ZIF-8 membranes prepared by rapid electrospray deposition
Vı´ctor Manuel Aceituno Melgar,안호원,김진수,Mohd Roslee Othman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Highly selective ZIF-8 membranes were successfully prepared by electrospray deposition for H2/CO2separation. This novel method produced ZIF-8membranes in a facile and time-efficientmanner using anelectrostatic force-assisted coating approach. In addition, the membrane thickness could be controlledeasily by simply varying the deposition time. Results from the experiment indicate that the membraneperformed preeminently in comparison with previously reported glassy and polymeric membranes forH2/CO2 separation. The H2 permeance of the ZIF-8 membrane prepared at 70 8C for 55.71 min was4.23 10 7 mol m 2 s 1 Pa 1 with H2/CO2 selectivity of 20.3.
He´ctor M. Sarabia-Sainz,Josafat Marina Ezquerra-Brauer,Hisila C. Santacruz-Ortega,Ofelia Rouzaud-Sa´ndez,Elisa M. Valenzuela-Soto,Monica Acosta-Elias,Wilfrido Torres-Arreola 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.1
Muscle from mantle, fins and arms of squid (Dosidicus gigas) were compared based on lysyl oxidase activity (LOX), chemical/structural and thermodynamic properties of highly cross-linked collagen. The arms collagen presented the highest temperature (Tp) and enthalpy of transition. The arms collagen thermic properties may be explained by the higher imino amino acid content, proline and lysine hydroxylation degrees. Moreover, among the regions, the collagen from the arms had a more intense b band chain, hydroxymerodesmosine peak in the resonance magnetic nuclear spectra and pyridinoline peak in the Raman spectra. Fins showed the highest LOX activity. The LOX activity was associated with the Tp, proline and lysine hydroxylation degrees. These results implied that the collagen in the arms was more intermolecularly ordered than the mantle and fins, and may provide a theoretical basis for a better understanding of the thermal behaviour of squid tissues during management and processing.
de la Pena, V?ctor Alonso,Darriba, Iria L,Valea, Martin Caserio,Rivera, Francisco Guitian The Korean Academy of Prosthodonitics 2016 The Journal of Advanced Prosthodontics Vol.8 No.6
PURPOSE. The aim of this in vitro study was to evaluate the mechanical properties (bending strength and hardness) of seven different fiber reinforced composite posts, in relation to their microstructural characteristics. MATERIALS AND METHODS. Two hundred eighty posts were divided into seven groups of 40, one group for each type of post analyzed. Within each group, 15 posts were subjected to three-point bending strength test, 15 to a microhardess meter for the Knoop hardness, and 10 to Scanning Electron Microscope in order to determine the diameter of the fibers and the percentage of fibers embedded in the matrix. To compare the flexural strength in relation to the type of fiber, matrix, and the hardness of the posts, a Kruskal-Wallis H test was used. The Jonckheere-Terpstra test was used to determine if the volume percent of fibers in the post influenced the bending strength. RESULTS. The flexural strength and the hardness depended on the type of fibers that formed the post. The lower flexural strength of a post could be due to deficient bonding between the fiber and the resin matrix. CONCLUSION. According to the results, other factors, besides the microstructural characteristics, may also influence the mechanical properties of the post. The feature that has more influence on the mechanical properties of the posts is the type of fiber.
M.D. Vı´ctor-Ortega,J.M. Ochando-Pulido,A. Martı´nez-Ferez 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
The performance of a fixed-bed cation exchange process was examined for final purification of the ironload derived from catalyst usage in the secondary treatment of olive mill wastewater, which led tounacceptable iron levels. Results showed an increase in the pH value up to 4 enhanced the iron ionexchange (IE) efficiency, which decreased upon higher pH. Furthermore, Thomas model provided utmostaccurate dynamic behavior modeling for all inlet concentrations studied (20, 50 and 100 mg L 1). Additionally, up to 100% recovery efficiencies were maintained even after 10 complete cycles. Finally, aneffluent with quality for irrigation reuse was obtained.
YSZ-carbonate dual-phase membranes for high temperature carbon dioxide separation
안호원,김대호,Vı´ctor Manuel Aceituno Melgar,김진수,Mohd Roslee Othman,Hoang Viet Phuc Nguyen,한종희,윤성필 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
A dense yttria stabilized zirconia (YSZ)-carbonate membrane that was impermeable to gas at low temperature became highly permeable to CO2 at temperature above the melting point of the carbonate. The CO2 permeance across the YSZ-molten carbonate dual-phase membrane was observed to be higher than 0.1 × 10-8 mol/m2/Pa/s at temperature >650 ℃. The movement of ions was promoted at high temperature as YSZ and molten carbonate became highly conductive to oxygen ions and carbonate species, respectively. Addition of poly(methyl methacrylate) (PMMA) during preparation of macro-porous YSZ support created interconnected pore structures that were found conducive for carbonate infiltration and integration with the membrane materials.
de Lorenzo, Ví,ctor,Prather, Kristala LJ,Chen, Guo‐,Qiang,O'Day, Elizabeth,von Kameke, Conrad,Oyarzú,n, Diego A,Hosta‐,Rigau, Leticia,Alsafar, Habiba,Cao, Cong,Ji, Weizhi,Okano John Wiley and Sons Inc. 2018 EMBO reports Vol.19 No.4
<P>The UN's Sustainable Development Goals present a challenge for biotechnology to develop new environmentally‐friendly and sustainable products and production processes. </P>
Aceituno Melgar, Ví,ctor Manuel,Kim, Jinsoo,Othman, Mohd Roslee Elsevier 2015 Journal of industrial and engineering chemistry Vol.28 No.-
<P><B>Abstract</B></P> <P>Zeolitic imidazolate framework (ZIF)-based membranes are emerging materials that are highly attractive for gas separation and purification. Highly reproducible defect-free ZIF membranes with well-defined pore structures can be formed in a number of ways. The performance of ZIF membranes depends largely on the preparation technique, application type, and operating conditions. Here, we review the methods of ZIF membrane preparation and discuss their performance in separating condensable and incondensable gases. In addition, recent developments in membrane synthesis and ways to improve the gas separation performance of ZIF membranes are discussed to promote industrial application and commercialization of ZIF membranes.</P>
Direct spraying approach for synthesis of ZIF-7 membranes by electrospray deposition
Aceituno Melgar, Ví,ctor Manuel,Kwon, Hyuk Taek,Kim, Jinsoo Elsevier 2014 Journal of membrane science Vol.459 No.-
<P>Zeolitic imidazolate frameworks (ZIFs) are promising materials for advanced membrane applications clue to their desirable properties, which enable them to recognize specific target molecules based on the molecular sieving mechanism and/or adsorption affinity. However, their large scale commercial applications still remain a challenge because of the absence of a synthesis method that offers reproducibility, scalability, and cost-effectiveness. To this end, here we report our work of synthesizing supported zeolitic imidazolate framework ZIF-7 films and membranes in a facile and time-efficient manner at ambient pressure using a simple electrospray deposition technique. A governing parameter which dominantly affected the microstructures and crystal integrity of the membranes was deposition temperature while precursor flow rate and applied voltage to the precursor solution were important variables to obtain a stable spraying mode which is essential to have a uniform coating. Our method, which is an electrostatic force-assisted coating approach, has the following attractive advantages over conventional synthetic routes such as in situ and secondary growth methods: (1) dramatic reduction in synthesis time and precursor consumption, (2) simplification in the activation process, and (3) potential scalability. Furthermore, the membranes obtained under optimized conditions outperformed previously reported ZIF-7 membranes for H-2/CO2 separation while showing rather noticeable improvement in H-2 permeance which is roughly 4-10 times higher than the previous counterparts. (C) 2014 Elsevier B.V. All rights reserved</P>