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Zhang, Xiaobo,Pint, Cary L.,Lee, Min Hyung,Schubert, Bryan Edward,Jamshidi, Arash,Takei, Kuniharu,Ko, Hyunhyub,Gillies, Andrew,Bardhan, Rizia,Urban, Jeffrey J.,Wu, Ming,Fearing, Ronald,Javey, Ali American Chemical Society 2011 NANO LETTERS Vol.11 No.8
<P>A simple approach is described to fabricate reversible, thermally- and optically responsive actuators utilizing composites of poly(<I>N</I>-isopropylacrylamide) (pNIPAM) loaded with single-walled carbon nanotubes. With nanotube loading at concentrations of 0.75 mg/mL, we demonstrate up to 5 times enhancement to the thermal response time of the nanotube-pNIPAM hydrogel actuators caused by the enhanced mass transport of water molecules. Additionally, we demonstrate the ability to obtain ultrafast near-infrared optical response in nanotube-pNIPAM hydrogels under laser excitation enabled by the strong absorption properties of nanotubes. The work opens the framework to design complex and programmable self-folding materials, such as cubes and flowers, with advanced built-in features, including tunable response time as determined by the nanotube loading.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-8/nl201503e/production/images/medium/nl-2011-01503e_0002.gif'></P>
Wen-wu Huang,Xiaobo Li,Meng Yue Wang,Hai-ming Shi,Ying Peng,Chong-sheng Peng,Min Zhang,Yue Li,Jing Lu 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.11
Two HPLC methods with diode array detection (HPLC-DAD) and electrospray ionization-mass spectrometry (HPLC-ESI/MS), respectively, were developed to investigate the differences of chemical constituents and their metabolism in gastrointestinal tract in vitro between two decoctions of crude and processed Glycyrrhizae radix. Total of eleven constituents (liquiritin apioside, liquiritin, licuraside, isoliquiritin, ononin, glycyrrhizin, liquiritigenin-7,4'-diglucoside, licorice saponin A3, 22β-acetoxylglycyrrhizic acid, licorice saponin G2, and yunganoside E2) were identified in the two decoctions, whereas lower contents of these constituents were usually found in the decoction of processed G. radix. Furthermore, these constituents were metabolized into their respective aglycons in human intestinal bacteria juice, and the metabolism ratios were all higher in processed G. radix decoction. No change was found in artificial gastric or intestinal juice. This study revealed that the processing can alter the contents of main constituents in crude G. radix and their metabolism in gastrointestinal tract, in which intestinal bacteria play an important role in the metabolism of licorice constituents.
Nan Xu,Wei-Min Liu,Ming Zhang,Xiaobo Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
The high-temperature tribological performance of lithium grease is enhanced by addition of Lewis acidborate ester, which could interact with Lewis base RCO2of lithium 12-hydroxystearate (LHS, constitutethe thickenerfiber network of lithium grease) to form a Lewis acid–base complex. Important detailsabout the Lewis acid–base complex and its reinforcing effect on the tribological performance areelucidated by means of SRV oscillating friction and wear tester (SRV), Fourier transformation infraredspectroscopy (FTIR), TGA–DSC, and rheological methods. The experimental results strongly suggest thatthere is a Lewis base–acid interaction between the boron atom of borate ester or boric acid and theoxygen atom of RCO2. Lewis acid centers can serve as second-level linking points to reinforce thestrength of the thickenerfiber network and further improve the colloidal stability of lubricating grease. Compared with pure LHS, the Lewis acid–base complex displays higher thermal stability, allowinglithium grease to be applied to higher temperature. Because of the enhancement of thermal stability andcolloidal stability,film-forming property under high temperature can be greatly improved, resulting in>15% friction and >95% wear reductions.
Switching terahertz waves with gate-controlled active graphene metamaterials
Lee, Seung Hoon,Choi, Muhan,Kim, Teun-Teun,Lee, Seungwoo,Liu, Ming,Yin, Xiaobo,Choi, Hong Kyw,Lee, Seung S.,Choi, Choon-Gi,Choi, Sung-Yool,Zhang, Xiang,Min, Bumki Nature Publishing Group 2012 Nature materials Vol.11 No.11
The extraordinary electronic properties of graphene provided the main thrusts for the rapid advance of graphene electronics. In photonics, the gate-controllable electronic properties of graphene provide a route to efficiently manipulate the interaction of photons with graphene, which has recently sparked keen interest in graphene plasmonics. However, the electro-optic tuning capability of unpatterned graphene alone is still not strong enough for practical optoelectronic applications owing to its non-resonant Drude-like behaviour. Here, we demonstrate that substantial gate-induced persistent switching and linear modulation of terahertz waves can be achieved in a two-dimensional metamaterial, into which an atomically thin, gated two-dimensional graphene layer is integrated. The gate-controllable light??matter interaction in the graphene layer can be greatly enhanced by the strong resonances of the metamaterial. Although the thickness of the embedded single-layer graphene is more than six orders of magnitude smaller than the wavelength (<貫/1,000,000), the one-atom-thick layer, in conjunction with the metamaterial, can modulate both the amplitude of the transmitted wave by up to 47% and its phase by 32.2째 at room temperature. More interestingly, the gate-controlled active graphene metamaterials show hysteretic behaviour in the transmission of terahertz waves, which is indicative of persistent photonic memory effects.
Ordered Arrays of Dual-Diameter Nanopillars for Maximized Optical Absorption
Fan, Zhiyong,Kapadia, Rehan,Leu, Paul W.,Zhang, Xiaobo,Chueh, Yu-Lun,Takei, Kuniharu,Yu, Kyoungsik,Jamshidi, Arash,Rathore, Asghar A.,Ruebusch, Daniel J.,Wu, Ming,Javey, Ali American Chemical Society 2010 Nano letters Vol.10 No.10
<P>Optical properties of highly ordered Ge nanopillar arrays are tuned through shape and geometry control to achieve the optimal absorption efficiency. Increasing the Ge materials filling ratio is shown to increase the reflectance while simultaneously decreasing the transmittance, with the absorbance showing a strong diameter dependency. To enhance the broad band optical absorption efficiency, a novel dual-diameter nanopillar structure is presented, with a small diameter tip for minimal reflectance and a large diameter base for maximal effective absorption coefficient. The enabled single-crystalline absorber material with a thickness of only 2 μm exhibits an impressive absorbance of ∼99% over wavelengths, λ = 300−900 nm. These results enable a viable and convenient route toward shape-controlled nanopillar-based high-performance photonic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-10/nl1010788/production/images/medium/nl-2010-010788_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl1010788'>ACS Electronic Supporting Info</A></P>