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Ubiquitous magneto-mechano-electric generator
Ryu, Jungho,Kang, Ju-Eun,Zhou, Yuan,Choi, Si-Young,Yoon, Woon-Ha,Park, Dong-Soo,Choi, Jong-Jin,Hahn, Byung-Dong,Ahn, Cheol-Woo,Kim, Jong-Woo,Kim, Yang-Do,Priya, Shashank,Lee, Seung Yong,Jeong, Seongsu The Royal Society of Chemistry 2015 Energy & environmental science Vol.8 No.8
<P>Stray magnetic field considered as harmful noise for the human body can be a ubiquitous energy source. We are surrounded with 50/60 Hz parasitic magnetic noise arising from power delivery infrastructure, but it cannot be readily utilized by traditional electromagnetic harvesters. Here, we introduce a novel magneto-mechano-electric (MME) generator with a colossal power density that can turn on 35 LEDs and drive a wireless sensor network under a weak magnetic field of 5–7 × 10<SUP>−4</SUP> T at a low frequency of 60 Hz. The MME generator is a cantilever structured magnetoelectric (ME) laminate composite in which the 〈011〉 oriented anisotropic single crystal fiber composite (SFC) is bonded to Ni plate and Nd permanent magnet proof mass. The ME laminate composite has a strong ME coupling (<I>α</I><SUB>ME</SUB>∼ 160 V cm<SUP>−1</SUP> Oe<SUP>−1</SUP>) even without magnetic bias due to the intrinsic property of Ni. The MME generator is also found to exhibit a colossal output power density of 46 mW cm<SUP>−3</SUP> Oe<SUP>−2</SUP> under a weak magnetic field of 1.6 × 10<SUP>−4</SUP> T at 60 Hz. This MME generator can be a ubiquitous power source for wireless sensor networks, low power electric devices, and wireless charging systems by harvesting tiny amounts of parasitic magnetic energy from our living environment.</P> <P>Graphic Abstract</P><P>A novel energy capturing technique for wasted parasitic magnetic noise based upon a magneto-mechano-electric (MME) generator, consisting of piezoelectric single crystal fibers and Ni metal plate in the form of cantilever structure. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5ee00414d'> </P>
Proteasome Inhibitors with Pyrazole Scaffolds from Structure-Based Virtual Screening
Miller, Zachary,Kim, Keun-Sik,Lee, Do-Min,Kasam, Vinod,Baek, Si Eun,Lee, Kwang Hyun,Zhang, Yan-Yan,Ao, Lin,Carmony, Kimberly,Lee, Na-Ra,Zhou, Shou,Zhao, Qingquan,Jang, Yujin,Jeong, Hyun-Young,Zhan, Ch American Chemical Society 2015 Journal of medicinal chemistry Vol.58 No.4
<P>We performed a virtual screen of ∼340 000 small molecules against the active site of proteasomes followed by in vitro assays and subsequent optimization, yielding a proteasome inhibitor with pyrazole scaffold. The pyrazole-scaffold compound displayed excellent metabolic stability and was highly effective in suppressing solid tumor growth in vivo. Furthermore, the effectiveness of this compound was not negatively impacted by resistance to bortezomib or carfilzomib.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jmcmar/2015/jmcmar.2015.58.issue-4/jm501344n/production/images/medium/jm-2014-01344n_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jm501344n'>ACS Electronic Supporting Info</A></P>
Sharpened VO<sub>2</sub> Phase Transition via Controlled Release of Epitaxial Strain
Lee, Daesu,Lee, Jaeseong,Song, Kyung,Xue, Fei,Choi, Si-Young,Ma, Yanjun,Podkaminer, Jacob,Liu, Dong,Liu, Shih-Chia,Chung, Bongwook,Fan, Wenjuan,Cho, Sang June,Zhou, Weidong,Lee, Jaichan,Chen, Long-Qin American Chemical Society 2017 NANO LETTERS Vol.17 No.9
<P>Phase transitions in correlated materials can be manipulated at the nanoscale to yield emergent functional properties, promising new paradigms for nanoelectronics and nanophotonics. Vanadium dioxide (VO2), an archetypal correlated material, exhibits a metal insulator transition (MIT) above room temperature. At the thicknesses required for heterostructure applications, such as an optical modulator discussed here, the strain state of VO2 largely determines the MIT dynamics critical to the device performance. We develop an approach to control the MIT dynamics in epitaxial VO2 films by employing an intermediate template layer with large lattice mismatch to relieve the interfacial lattice constraints, contrary to conventional thin film epitaxy that favors lattice match between the substrate and the growing film. A combination of phase-field simulation, in situ real-time nanoscale imaging, and electrical measurements reveals robust undisturbed MIT dynamics even at preexisting structural domain boundaries and significantly sharpened MIT in the templated VO2 films. Utilizing the sharp MIT, we demonstrate a fast, electrically switchable optical waveguide. This study offers unconventional design principles for heteroepitaxial correlated materials, as well as novel insight into their nanoscale phase transitions.</P>