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Kim, Ji Tae,Seol, Seung Kwon,Pyo, Jaeyeon,Lee, Ji San,Je, Jung Ho,Margaritondo, G. WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.17
<P>The inside cover shows “nanocandle arrays” of conducting polymer. On p. 1968 Jung Ho Je, G. Margaritondo, and co‐workers demonstrate accurate and versatile three‐dimensional writing of conducting polymer nanowires based on guiding a monomer meniscus by pulling a micropipette during oxidative polymerization. This is an important step forward for the integration of organic electronic devices with high density and enhanced freedom in circuit design. </P>
A coherent synchrotron X-ray microradiology investigation of bubble and droplet coalescence
Weon, B. M.,Je, J. H.,Hwu, Y.,Margaritondo, G. International Union of Crystallography 2008 Journal of synchrotron radiation Vol.15 No.6
<▼1><P>Microradiology with coherent X-rays is shown to be very effective in revealing interfaces in multiphase systems and in particular gas bubbles. Its use has been tested in the study of bubble colescence validating the results with a simple theoretical analysis based on mass conservation.</P></▼1><▼2><P>A quantitative application of microradiology with coherent X-rays to the real-time study of microbubble and microdroplet coalescence phenomena, with specific emphasis on the size relations in three-body events, is presented. The results illustrate the remarkable effectiveness of coherent X-ray imaging in delineating interfaces in multiphase systems, in accurately measuring their geometric properties and in monitoring their dynamics.</P></▼2>
D.Pavuna,M.Abrecht,D.Clo?tta,X.X.Xi,Margaritondo,D.Ariosa 한국물리학회 2002 Current Applied Physics Vol.2 No.4
Properties of ultra-thin films are dierent from their single crystal counterparts due to the presence of (substrate induced)strain,dierent degree and type of (growth induced)disorderand dierent averagedoping (distribution of oxygen vacancies, for example).! 1 unit cell (UC)) superconducting oxide lms grown by laser ablation.Systematic studies show that BSCCO-2212, 2201, 2223, and LSCO-214 exhibit conductor-like Fermi edge, whereas materialscontaining ‘‘chains’’ (like YBCO-123) are prone to very rapid surface degradation, possibly related to critical oxygen loss at theoutermost layers. Combined with X-ray analysis we have determined that BSCCO-2212 lms undergo a structural phase transitionat a nominal thickness of approximately 1 UC, converting the precursor Bi2O2:33 highly coherent ultra-thin lm into the Bi-2212214 thin lms (withTc of up to 44 K) are also discussed. For the rst time the dispersion in ARPES spectra measured on such in situgrown strained LSCO lm is shown. The relevance of these new results is briey discussed.. 2002 Published by Elsevier Science B.V.
Advanced X-ray Microscopy in Materials and Biomedical Sciences
J.M. Yi,B.M. Weon,J.H. Je,Y. Hwu,G. Margaritondo 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
In recent years, x-ray microscopy has been literally revolutionized by the exploitation of the unique characteristics of synchrotron sources. In particular, the high spatial coherence of the radiation significantly contributes to the development of advanced and powerful xray microscopy. The results are very high quality microradiology and microtomograhy images and movies - taken with a limited x-ray dose ? that find a variety of applications in materials science, biology and medical research. In this talk we review basic theory and selected applications of phase contrast x-ray microscopy to materials and biomedical sciences. Furthermore we introduce a new strategy of combining phase contrast radiology and diffraction x-ray microscopy to visualize atomic level defects such as misfit dislocations and micropipes in semiconductor single crystals. Finally phase contrast x-ray imaging in nanometer-resolution (< 30 ㎚) will be demonstrated.
Imaging of renal and prostate carcinoma with refractive index radiology
Yoon, Cheol Yong,Sung, Duck Je,Lee, Ju Han,Kim, Ae Ri,Oh, Chil Whan,Je, Jung Ho,Weon, Byung Mook,Seol, Seung Kwon,Pyun, Aram,Hwu, Yeukuang,Margaritondo, Giorgio,Joo, Kwan Joong,Yoon, Duck Ki THE JAPANESE UROLOGICAL ASSOCIATION 2007 International Journal of Urology Vol. No.
<P><B>Aim: </B> Having better edge enhancement and penetrating power, refractive index radiology is suitable for the imaging of weakly absorbing objects such as tissue specimens. In this study the potential of refractive index radiology was evaluated for the imaging of renal cell carcinoma (RCC) and prostate cancer (PCA).</P><P><B>Methods: </B> Specimens were cut in 3 mm and 4 µm thickness for X‐ray radiology and hematoxylin and eosin (HE) staining, respectively. Radiographic images of RCC and PCA were obtained using the synchrotron hard X‐rays from the 7B2 beam‐line of the Pohang Light Source (PLS). The imaging technique applied was phase‐contrast radiology based on the refraction enhancement mechanism. The resulting radiographic images were analyzed in correlation with those of optical microscopy.</P><P><B>Results: </B> Using unmonochromatized hard X‐rays, it was possible to obtain images with clear edge enhancement and relatively large field of view (6 cm × 6 cm). Even with overlapping signals from thick samples (more than 700‐fold thicker than microscopic images), radiographic images clearly showed histological information of organelles in normal kidney such as glomeruli, tubules, and collecting ducts. Histological information of RCC including tumor subtypes and minute changes such as cystic degeneration could be identified without difficulty. The radiographic images of the prostate were comparable with those of low magnification optical microscopy, providing good visualization of normal microstructures such as adenoma, smooth muscle, and normal glands, or differentiation of tiny tumors from surrounding normal tissues.</P><P><B>Conclusions: </B> These results suggest the potential of refractive index radiology to provide a new way of imaging biological tissues with low absorption contrast such as RCC and PCA.</P>
Intense X-ray induced formation of silver nanoparticles stabilized by biocompatible polymers
Wang, Chang-Hai,Liu, Chi-Jen,Wang, Cheng-Liang,Chien, Chia-Chi,Hwu, Y.,Liu, Ru-Shi,Yang, Chung-Shi,Je, Jung-Ho,Lin, Hong-Ming,Margaritondo, G. Springer-Verlag 2009 Applied physics. A, Materials science & processing Vol.97 No.2