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Liu, Fang,Ma, Ni,Xia, Fang-Bo,Li, Peng,He, Chengwei,Wu, Zhenqiang,Wan, Jian-Bo The Korean Society of Ginseng 2019 Journal of Ginseng Research Vol.43 No.1
Background: Ginsenosides with less sugar moieties may exhibit the better adsorptive capacity and more pharmacological activities. Methods: An efficient method for the separation of four minor saponins, including gypenoside XVII, notoginsenoside Fe, ginsenoside Rd2, and notoginsenoside Fd, from Panax notoginseng leaves (PNL) was established using biotransformation, macroporous resins, and subsequent preparative high-performance liquid chromatography. Results: The dried PNL powder was immersed in the distilled water at $50^{\circ}C$ for 30 min for converting the major saponins, ginsenosides Rb1, Rc, Rb2, and Rb3, to minor saponins, gypenoside XVII, notoginsenoside Fe, ginsenoside Rd2, and notoginsenoside Fd, respectively, by the enzymes present in PNL. The adsorption characteristics of these minor saponins on five types of macroporous resins, D-101, DA-201, DM-301, X-5, and S-8, were evaluated and compared. Among them, D-101 was selected due to the best adsorption and desorption properties. Under the optimized conditions, the fraction containing the four target saponins was separated by D-101 resin. Subsequently, the target minor saponins were individually separated and purified by preparative high-performance liquid chromatography with a reversed-phase column. Conclusion: Our study provides a simple and efficient method for the preparation of these four minor saponins from PNL, which will be potential for industrial applications.
Fang Liu,Ni Ma,Fang-Bo Xia,Peng Li,Chengwei He,Zhenqiang Wu,Jian-Bo Wan 고려인삼학회 2019 Journal of Ginseng Research Vol.43 No.1
Background: Ginsenosides with less sugar moieties may exhibit the better adsorptive capacity and more pharmacological activities. Methods: An efficient method for the separation of four minor saponins, including gypenoside XVII, notoginsenoside Fe, ginsenoside Rd2, and notoginsenoside Fd, from Panax notoginseng leaves (PNL) was established using biotransformation, macroporous resins, and subsequent preparative high-performance liquid chromatography. Results: The dried PNL powder was immersed in the distilled water at 50C for 30 min for converting the major saponins, ginsenosides Rb1, Rc, Rb2, and Rb3, to minor saponins, gypenoside XVII, notoginsenoside Fe, ginsenoside Rd2, and notoginsenoside Fd, respectively, by the enzymes present in PNL. The adsorption characteristics of these minor saponins on five types of macroporous resins, D-101, DA-201, DM-301, X-5, and S-8, were evaluated and compared. Among them, D-101 was selected due to the best adsorption and desorption properties. Under the optimized conditions, the fraction containing the four target saponins was separated by D-101 resin. Subsequently, the target minor saponins were individually separated and purified by preparative high-performance liquid chromatography with a reversed-phase column. Conclusion: Our study provides a simple and efficient method for the preparation of these four minor saponins from PNL, which will be potential for industrial applications.
Seo, Jung-Hun,Yuan, Hao-Chih,Sun, Lei,Zhou, Weidong,Ma, Zhenqiang The Korean Infomation Display Society 2011 Journal of information display Vol.12 No.2
This paper summarizes the recent fabrication and characterizations of flexible high-speed radio frequency (RF) transistors, PIN-diode single-pole single-throw switches, as well as flexible inductors and capacitors, based on single-crystalline Si nanomembranes transferred on polyethylene terephthalate substrates. Flexible thin-film transistors (TFTs) on plastic substrates have reached RF operation speed with a record cut-off/maximum oscillation frequency ($f_T/f_{max}$) values of 3.8/12 GHz. PIN diode switches exhibit excellent ON/OFF behaviors at high RF frequencies. Flexible inductors and capacitors compatible with high-speed TFT fabrication show resonance frequencies ($f_{res}$) up to 9.1 and 13.5 GHz, respectively. Robust mechanical characteristics were also demonstrated with these high-frequency passives components.
Jung-Hun Seo,Hao-Chih Yuan,Lei Sun,Weidong Zhou,Zhenqiang Ma 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.2
This paper summarizes the recent fabrication and characterizations of flexible high-speed radio frequency (RF) transistors,PIN-diode single-pole single-throw switches, as well as flexible inductors and capacitors, based on single-crystalline Si nanomembranes transferred on polyethylene terephthalate substrates. Flexible thin-film transistors (TFTs) on plastic substrates have reached RF operation speed with a record cut-off/maximum oscillation frequency (fT/fmax) values of 3.8/12 GHz. PIN diode switches exhibit excellent ON/OFF behaviors at high RF frequencies. Flexible inductors and capacitors compatible with high-speed TFT fabrication show resonance frequencies (fres) up to 9.1 and 13.5 GHz, respectively. Robust mechanical characteristics were also demonstrated with these high-frequency passives components.
A Multifunction Heterojunction Formed Between Pentacene and a Single‐Crystal Silicon Nanomembrane
Seo, Jung‐,Hun,Oh, Tae‐,Yeon,Park, Jungho,Zhou, Weidong,Ju, Byeong‐,Kwon,Ma, Zhenqiang WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.27
<P><B>Abstract</B></P><P>A mesh patterned n‐type single‐crystalline silicon nanomembrane (SiNM) created from a silicon‐on‐insulator (SOI) wafer is complementally combined with a p‐type pentacene layer to form a heterogeneous p‐n junction on a flexible plastic substrate. Excellent rectifying characteristics are obtained from the heterogeneous p‐n diode. The diode also exhibits photosensitivity at visible wavelengths with a photo‐to‐dark current ratio exceeding four orders, a responsivity of 0.7 A/W, and an external quantum efficiency of 21.9% at 633 nm. Over 60% average transmittance in the visible spectrum is measured from the heterogeneous multilayer junction on a plastic substrate. Outstanding mechanical bending characteristics are observed with up to 1.08% of strain applied to the diode. These results suggest that organic‐inorganic heterogeneous integration may be a viable strategy to build flexible organic‐inorganic heterojunction devices and thus enable a number of novel multifunctional applications.</P>
Large-Area Printed Broadband Membrane Reflectors by Laser Interference Lithography
Jung-Hun Seo,Jungho Park,Deyin Zhao,Hongjun Yang,Weidong Zhou,Byeong-Kwon Ju,Zhenqiang Ma IEEE 2013 IEEE photonics journal Vol.5 No.1
<P>We report here large-area broadband photonic crystal membrane reflectors (MRs) on glass substrates based on laser interference lithography (LIL) patterning and elastic stamp membrane transfer printing techniques. High-reflectivity broadband MRs on glass were realized with measured reflectivity of 95% around 1300 nm and a bandwidth of about 100 nm. Large-area nanopattern uniformity was experimentally verified with measured reflectivity from multiple locations of the large-area MRs. The work could lead to fabrication of the large-area high-performance MR at low cost with high throughput. The reflectors can be used in many types of optoelectronic and photonic devices.</P>
Detecting the Oxidation of Zircaloy Claddings by Infrared Interference
Hongyi Mi,Solomon Mikael,Edward Swinnich,Todd Allen,Kumar Sridharan,Darryl P. Butt,Shaoqin Gong,Sean M. McDeavitt,James P. Blanchard,서정훈,Zhenqiang Ma 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2
As the expected life of dry cask storage installations increases, it becomes increasingly desirable to monitor the state and performance of the cask internals to ensure that they continue to safely contain the radioactive materials in the fuel. One aspect of this task is the monitoring of oxidation of the cladding. With this consideration in mind, Zircaloy-4 (Zr-4) cladding samples were exposed to air at 500℃ for various duration times to create thin corrosion oxide layers on the surface. The surfaces of the oxidized samples were then systematically scanned by Fourier Transform Infrared (FT-IR) spectroscopy to achieve the infrared (IR) interference spectra and study the relationship between the optical interference and the various thicknesses of the oxide layers. The profiles of the oxide layers were verified througth cross-sectional examination by Scanning Electron Microscopy. The IR interference patterns varied with oxide layer thickness, enabling the determination of oxide layer thickness of values, including half micron thick. Further analysis demonstrated that the interference oscillation period and the oscillation amplitude decreased with increasing oxide layer thickness. Combined with a physical model that describes the optical interference, the interference spectra were directly correlated to the oxide layer thickness quantitatively. The study provides the basis for an accurate, nondestructive and sensitive method to monitor the degree of zirconium-based cladding corrosion due to oxidation.
Thin Film Receiver Materials for Deterministic Assembly by Transfer Printing
Kim, Tae-il,Kim, Mo Joon,Jung, Yei Hwan,Jang, Hyejin,Dagdeviren, Canan,Pao, Hsuan An,Cho, Sang June,Carlson, Andrew,Yu, Ki Jun,Ameen, Abid,Chung, Hyun-joong,Jin, Sung Hun,Ma, Zhenqiang,Rogers, John A. American Chemical Society 2014 Chemistry of materials Vol.26 No.11
<P>We present a specially designed materials chemistry that provides ultrathin adhesive layers with persistent tacky surfaces in solid, nonflowable forms for use in transfer printing and related approaches to materials and micro/nanostructure assembly. The material can be photocured after assembly, to yield a robust and highly transparent coating that is also thermally and electrically stable, for applications in electronics, optoelectronics, and other areas of interest.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2014/cmatex.2014.26.issue-11/cm501002b/production/images/medium/cm-2014-01002b_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm501002b'>ACS Electronic Supporting Info</A></P>