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| 1 | Dynamic separation of Xe and Kr by metal-organic framework and covalent-organic materials: a comparison with activated charcoal显示文摘We systematically investigate dynamic separation of Xe and Kr at room temperature using four representative porous materials(Cu-BTC, ZIF-8, COP-4 and activated carbon(AC)). Results indicate that among the four materials, Cu-BTC not only shows the highest retention volume per gram(V_g=788 m L g^(-1), which is 1.8 times of activated carbon(436 m L g^(-1))) under flowing condition, but also can separate 350 ppm Xe from 35 ppm Kr mixture in air with a high Xe/Kr selectivity of 8.6 at room temperature and 200 k Pa, due to its suitable pore morphology, open metal sites, small side pockets in the framework. Moreover, the Cu-BTC also performs well on individual separation of Xe, Kr, CO_2 from five-component gas mixture(Xe:Kr:CO_2:Ar:N_2= 1:1:1:1:0.5, V/V) and has the longest retention time for Xe(20 min) in gas chromatographic separation, suggesting that it is a good candidate for potential applications as polymeric sieves. | Qian Wan Shunshun Xiong Zhonghua Xiang Shuming Peng Xiaolin Wang Dapeng Cao | 2016 | Science China Chemistry2016，59，5： | 3 |
| 2 | Quercetin promotes human epidermal stem cell proliferation through the estrogen receptor/β-catenin/c-Myc/cyclin A2 signaling pathway显示文摘Skin epidermal stem cells(EpSCs)play an important role in wound healing.Quercetin is a phytoestrogen reported to accelerate skin wound healing,but its effect on EpSCs is unknown.In this study,we investigated the effect of quercetin on human EpSC proliferation and explored the underlying mechanisms.We found that quercetin at 0.1~1μM significantly promoted EpSC proliferation and increased the number of cells in S phase.The pro-proliferative effect of quercetin on EpSCs was confirmed in cultured human skin tissue.Mechanistic studies showed that quercetin significantly upregulated the expressions ofβ-catenin,c-Myc,and cyclins A2 and E1.Inhibitor forβ-catenin or c-Myc significantly inhibited quercetin-induced EpSC proliferation.Theβ-catenin inhibitor XAV-939 suppressed quercetin-induced expressions ofβ-catenin,c-Myc,and cyclins A2 and E1.The c-Myc inhibitor 10058-F4 inhibited the upregulation of c-Myc and cyclin A2 by quercetin.Pretreatment of EpSCs with estrogen receptor(ER)antagonist ICI182780,but not the G protein-coupled ER1 antagonist G15,reversed quercetin-induced cell proliferation and upregulation ofβ-catenin,c-Myc,and cyclin A2.Collectively,these results indicate that quercetin promotes EpSC proliferation through ER-mediated activation ofβ-catenin/c-Myc/cyclinA2 signaling pathway and ER-independent upregulation of cyclin E1 and that quercetin may accelerate skin wound healing through promoting EpSC proliferation.As EpSCs are used not only in clinic to treat skin wounds but also as seed cells in skin tissue engineering,quercetin is a useful reagent to expand EpSCs for basic research,skin wound treatment,and skin tissue engineering. | Zhaodong Wang Guangliang Zhang Yingying Le Jihui Ju Ping Zhang Dapeng Wan Qiang Zhao Guangzhe Jin Hao Su Jinwei Liu Jiaxuan Feng Yi Fu Ruixing Hou | 2020 | Acta Biochimica et Biophysica Sinica2020，52，10： | 3 |
| 3 | Catalyst-Free In Situ Carbon Nanotube Growth in Confined Space via High Temperature Gradient显示文摘Carbonaceous materials,such as graphite,carbon nanotubes(CNTs),and graphene,are in high demand for a broad range of applications,including batteries,capacitors,and composite materials.Studies on the transformation between diferent types of carbon,especially from abundant and low-cost carbon to high-end carbon allotropes,have received surging interest.Here,we report that,without a catalyst or an external carbon source,biomass-derived amorphous carbon and defective reduced graphene oxide(RGO)can be quickly transformed into CNTs in highly confned spaces by high temperature Joule heating.Combined with experimental measurements and molecular dynamics simulations,we propose that Joule heating induces a high local temperature at defect sites due to the corresponding high local resistance.Te resultant temperature gradient in amorphous carbon or RGO drives the migration of carbon atoms and promotes the growth of CNTs without using a catalyst or external carbon source.Our fndings on the growth of CNTs in confned spaces by fast high temperature Joule heating shed light on the controlled transition between diferent carbon allotropes,which can be extended to the growth of other high aspect ratio nanomaterials. | Chaoji Chen Yanan Chen Shuze Zhu Jiaqi Dai Glenn Pastel Yonggang Yao Dapeng Liu Yanbin Wang Jiayu Wan Teng Li Wei Luo Liangbing Hu | 2018 | Research2018，，1： | 2 |
| 4 | Delaminated layered double hydroxide delivers DNA molecules as sandwich nanostructure into cells via a non-endocytic pathway显示文摘Layered double hydroxides(LDHs) are effective molecular carriers in cytological research, gene therapy,and transgenic applications. Herein, we investigated the internalization behavior of the LDH-DNA bioconjugates via a microscopic approach and analyzed the internalization pathway by dissipative particle dynamics(DPD) simulations. We experimentally found that LDH can efficiently carry DNA into the nucleus of cell in BY-2 suspension cells. Furthermore, atomic force microscopy and X-ray diffraction analysis demonstrated that the LDH-DNA bioconjugates mainly exist as a DNA-LDH-DNA sandwich complex,while the LDH-DNA-LDH sandwich complex and DNA-LDH complex cannot be excluded. The DPD simulations further indicated that only the DNA-LDH-DNA sandwich structure could penetrate the plasma membrane(PM), while PM is impermeable to the LDH-DNA-LDH sandwich complex and the DNA-LDH complex. This work provides novel perspective for understanding the membrane penetration mechanism of LDH nano-sheets and new insights into the design of novel molecular delivery systems.ó 2017 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved. | Ye Li Wenlong Bao Hongyang Wu Junya Wang Yu Zhang Yinglang Wan Dapeng Cao Dermot O'Hare Qiang Wang | 2017 | Science Bulletin2017，62，10： | 1 |
| 5 | A facile strategy of in-situ anchoring of Co_(3)O_(4) on N doped carbon cloth for an ultrahigh electrochemical performance显示文摘Enhancement of supercapacitors(SCs)with high-energy density and high-power density is still a great challenge.In this paper,a facile strategy for in situ anchoring of Co_(3)O_(4) particles on N doped carbon cloth(pCoNCC)is reported.Due to the interaction of the doped N and Co_(3)O_(4),the electrochemical performance improves significantly,reaching 1,940.13 mF·cm^(−2) at 1 mA·cm^(−2) and energy density of 172.46μWh·cm^(−2) at the power density of 400μW·cm^(−2),much larger than that without N doping electrode of 28.5 mF·cm^(−2).An aqueous symmetric supercapacitor(ASSC)assembled by two pCoNCC electrodes achieves a maximum energy density of 447.42μWh·cm^(−2) and a highest power density of 8,000μW·cm^(−2).Utilizing such a high-energy storage ASSC,a digital watch and a temperature-humidity detector are powered for nearly 1 and 2 h,respectively.Moreover,the ASSC displays a superb electrochemical stability of 87.7%retention after 10,000 cycles at 40 mA·cm^(−2).This work would provide a new sight to enhance active materials performance and be beneficial for the future energy storage and supply systems. | Junlin Lu Jien Li Jing Wan Xiangyu Han Peiyuan Ji Shuang Luo Mingxin Gu Dapeng Wei Chenguo Hu | 2021 | Nano Research2021，14，7： | 0 |
| 6 | A purely green approach to low-cost mass production of zeolitic imidazolate frameworks显示文摘Although zeolitic imidazolate frameworks(ZIFs)have bright prospects in wide fields like gas storage/separation,catalysis and medicine,etc.,their large-scale applications are bottlenecked by the absence of their low-cost commercial production technique.Here,we report an uncon ventional method suitable for environmentally friendly and low-cost mass-production of ZIFs.In this method,taking the synthesis of ZIF-8 as an example,ZnO was used instead of Zn(NO_(3))_(2) in traditional solvent synthesis methods and CO_(2) was introduced to dissolve ZnO in aqueous solution of 2-methylimidazole(HMeim)and form water soluble salt([ZnMeim]^(+)[MeimCOO]^(-))at room temperature.Then,by removing CO_(2) through heating or vacuuming,Meim-ions are produced and instantaneously assemble with[ZnMeim]^(+)s to generate ZIF-8 without any by product.Due to the absence of strong acid anions(such as NO^(-)_(3) and Cl^(-) et al.)in solution,the washing of filter cake required in the conventional approaches could be omitted and the filtrate containing only water and HMeim could be reused completely.This method is really green as no waste gas or liquid generates because CO_(2) and water could be recycled perfectly.It overcomes almost all bottlenecks occurred in commercial production of ZIF-8 when using traditional methods.A pilot plant was established for mass-production of ZIF-8 and hundreds kilograms of ZIF-8 was produced,which indicates that the new method is not only environmentally friendly but also low cost and commercial accessibility.It is expected that the new method would open an avenue for commercial applications of ZIFs. | Hai Li Wan Chen Bei Liu Mingke Yang Zixuan Huang Changyu Sun Chun Deng Dapeng Cao Guangjin Chen | 2023 | Green Energy & Environment2023，8，3： | 0 |
| 7 | TiO_(2)@NH_(2)-MIL-125(Ti) composite derived from a partial-etching strategy with enhanced carriers' transfer for the rapid photocatalytic Cr(Ⅵ) reduction显示文摘Metal-organic frameworks (MOFs)-based composites have been widely applied as photocatalysts because of their synergistic effect between the two individual component.Herein,TiO_(2)@NH_(2)-MIL-125(Ti) nanocomposites which possess unsaturated titanium–oxo clusters,mesoporous structure,and intimate interface were successfully constructed via an in-situ distilled water-etched route.The X-ray photoelectron spectroscopy (XPS) measurements indicated strong electronic interaction between TiO_(2)and NH_(2)-MIL-125(Ti),confirming the formation of TiO 2@NH_(2)-MIL-125(Ti) nanocomposite.Photoelectrochemical and thermodynamics measurements showed that TiO_(2)@NH_(2)-MIL-125(Ti)nanocomposites have improved charge separation efficient and decreased transfer resistance of the carriers within the heterojunction interfaces,which facilitates the photoexcited electrons transfer and reduction of the Cr(VI) species.Therefore,the optimal TiO_(2)@NH_(2)-MIL-125(Ti)nanocomposite demonstrated superior performance compared to NH_(2)-MIL-125(Ti) and NH_(2)-MIL-125(Ti) derived TiO_(2).Based on the free radical trapping experiment and electron paramagnetic resonance (EPR) measurements,a possible type-II scheme was proposed for the enhanced photocatalytic activity over the TiO_(2)@NH_(2)-MIL-125(Ti) nanocomposite. | Fang Xu Wanning Cao Jinzhou Li Songsong Zhi Zhiyong Gao Yuqin Jiang Wei Li Kai Jiang Dapeng Wu | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，4： | 0 |
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