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Effect of Sb Addition on Microstructure and Mechanical Properties of Al-18B-4O-33/AS-52 Magnesium Matrix Composites

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Journal of Materials Science & Technology 2008年第1期24卷 99-101页

作者： Wookjin Lee Ikmin park x yongho park School of Materials Science and Engineering Pusan National University San 30 Jangjeon-dong Geumjeong-gu Busan 609-735 Korea

The effect of antimony addition on the microstructure of Mg-Al-Si magnesium matrix composite was investi- *** addition of Sb can modify the morphology of Mg-2Si particles which have Chinese script shape to fine polygonal *** matrix composite with Alborex whisker was successfully fabricated by using a squeeze infiltration *** strength and elongation were increased in the Sb modified alloy and the composite at both room and high temperatures.

关键词： Magnesium Metal matrix composites (MMC) Composite

Ageing Behavior of Mg-xAl-Zn with Variation of Al Content

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Journal of Materials Science & Technology 2008年第1期24卷 51-53页

作者： Byoungho Kim Jongjin Jeon Yeongdo park yongho park Ikmin park Department of Materials Science and Engineering Pusan National University 30 Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Advanced Materials Engineering Dong-Eui University 995 EomgwangnoJin-guBusan 614-714Korea

The ageing behavior of Mg-xAl-Zn alloys with a variation of AI contents （x=3,5,7,9 and 11 wt pct） were *** solution treatment and artificial ageing were carried out at 693 and 493 K,respectively. After the solid solution treatment,β-Mg-（17）Al-（12） was resolved to theα-Mg matrix in the specimens which contained Al up to 9 wt pct and partially resolved in the specimen of 11 wt pct *** ageing,theβ- Mg-（17）Al-（12） phase was precipitated at the grain boundary in the form of discontinuous precipitation and grown into the *** volume fraction ofβ-phase was increased with the Al *** strength increased with the volume fraction of precipitatedβ-phase,which was believed to strengthen the matrix.

关键词： Ageing Mg alloy Discontinuous precipitation

Elimination of extraordinarily high cracking susceptibility of aluminum alloy fabricated by laser powder bed fusion

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Journal of Materials Science & Technology 2022年第8期103卷 50-58页

作者： Holden Hyer Le Zhou Sharon park Thinh Huynh Abhishek Mehta Saket Thapliyal Rajiv S.Mishra yongho Sohn Department of Materials Science and Engineering University of Central FloridaOrlandoFLUSA Center for Friction Stir Processing Department of Materials Science and EngineeringAdvanced Materials and Manufacturing Processes InstituteUniversity of North TexasDentonTXUSA Now Research Scientist Oak Ridge National LaboratoryOak RidgeTNUSA Now Assistant Professor Marquette UniversityMilwaukeeWIUSA Now PhD Candidate Johns Hopkins UniversityBaltimoreMDUSA

Using the calculation of phase diagrams approach and Scheil solidification modeling,the Al-2.5Mg-1.0Ni-0.4Sc-0.1Zr alloy was designed,intentionally with an extraordinarily high cracking susceptibility,making it prime for solidification cracking during laser powder bed *** study demonstrates the ability to mitigate even the most extreme solidification cracking tendencies in aluminum alloys with only minor alloying additions of Sc and Zr,0.5 wt.%***,by employing a simple direct ageing heat treatment,good tensile mechanical properties were observed with a yield strength of 308 MPa,an ultimate tensile strength of 390 MPa,and a total elongation of 11%.

关键词： Additive manufacturing Cracking susceptibility Aluminum alloy CALPHAD Mechanical properties

Development of exosome membrane materialsfused microbubbles for enhanced stability and efficient drug delivery of ultrasound contrast agent

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Acta Pharmaceutica Sinica B 2023年第12期13卷 4983-4998页

作者： yongho Jang Jeehun park Pilsu Kim Eun-Joo park Hyungjin Sun Yujin Baek Jaehun Jung Tai-kyong Song Junsang Doh Hyuncheol Kim Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Republic of Korea Research Institute of Advanced Materials(RIAM) Institute of Engineering ResearchSeoul National UniversitySeoul 08826Republic of Korea Department of Electronic Engineering Sogang UniversitySeoul 04107Republic of Korea Biomedical Research Institute&Department of Radiology Seoul National University HospitalSeoul 03080Republic of Korea Interdisciplinary Program in Bioengineering Seoul National UniversitySeoul 08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Institute of Engineering Research Bio-MAX InstituteSeoul National UniversitySeoul 08826Republic of Korea Department of Biomedical Engineering Sogang UniversitySeoul 04107Republic of Korea

Lipid-coated microbubbles are widely used as an ultrasound contrast agent,as well as drug delivery ***,the two main limitations in ultrasound diagnosis and drug delivery using microbubbles are the short half-life in the blood system,and the difficulty of surface modification of microbubbles for active *** exosome,a type of extracellular vesicle,has a preferentially targeting ability for its original *** this study,exosome-fused microbubbles(Exo-MBs)were developed by embedding the exosome membrane proteins into *** a result,the stability of Exo-MBs is improved over the conventional *** the same principle that under the exposure of ultrasound,microbubbles are cavitated and self-assembled into nano-sized particles,and Exo-MBs are self-assembled into exosome membrane proteins-embedded nanoparticles(Exo-NPs).The Exo-NPs showed favorable targeting properties to their original cells.A photosensitizer,chlorin e6,was loaded into Exo-MBs to evaluate therapeutic efficacy as a drug *** higher therapeutic efficacy of photodynamic therapy was confirmed,followed by cancer immunotherapy from immunogenic cell *** have therefore developed a novel ultrasound image-guided drug delivery platform that overcomes the shortcomings of the conventional ultrasound contrast agent and is capable of simultaneous photodynamic therapy and cancer immunotherapy.

关键词： Exosomes Microbubbles Photodynamic therapy Ultrasound Sonoporation Cancer immunotherapy Drug delivery

Synthesis and cost estimation of ethylene oxide process using PRO/Ⅱ

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Journal of Measurement Science and Instrumentation 2013年第4期4卷 385-391页

作者： Suri park Sangwook Han yongho Hong Byungjick Kim Department of Chemical Engineering Soongsil University

Ethylene oxide （EO） is a sold-out intermediate material for producing various *** chemical companies are interested in whether new EO plant can create *** research is undertaken to investigate the economic feasibility of EO *** oxidation of ethylene using silver on alpha-A12O3 catalyst type is adapted to produce EO of 60 000 t/*** conduct the conceptual ***,we synthesize the optimal structure and then determine optimal conditions and the size of the *** study shows that profit and loss turning point turns out to be 3.2 years based on the present market *** addition,we conducts the economic analysis to prepare the risk of raw material market price variation ranging from 70％ to 130％.

关键词： ethylene oxide (EO) PRO/Ⅱ simulation optimal structure feasibility studyDocument code:AArticle ID:1674-8042(2013)04-0385-07

Smart decontamination device for small-size radioactive scrap metal:using abrasion pin in rotating magnetic field and ultrasonic wave cleaner

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Journal of Measurement Science and Instrumentation 2013年第3期4卷 302-306页

作者： yongho Hong Suri park Sangwook Han Byungjick Kim Department of Chemical Engineering Soongsil University

A smart decontamination device is developed for small-size radioactive scrap metal(SSRSM)arisen from nuclear *** abrasion pin in rotating magnetic field and ultrasonic wave cleaner are used for solving the problems of the second decontamination and high treatment *** first,the decontamination efficiency of each device is improved by upgrading the *** operating conditions are determined for each ***,both techniques are applied *** results show that the efficiency of combined decontamination device is higher than that of each *** the use of the developed device,the various SSRSMs are decontaminated for 15 min treatment in magnetic abrasion device and15 min treatment in ultrasonic cleaning *** index ranges from18 to *** values of all decontaminated samples are below the background value.

关键词： radioactive scrap metal decontamination magnetic field ultrasonic cleaningCLC number:X771 Document code:AArticle ID:1674-8042(2013)03-0302-05