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Qian Sun,Lei Zhu,Ze-Da Meng,Kefayat Ullah,Shu Ye,오원춘 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.4
ACF and ZnO modified TiO2 composite materials (ZnO-ACF/TiO2) were prepared by a sol-gel method. The composites were characterized by X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis and scanning electron microscope (SEM) analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. The degradation of the MO was determined using UV spectrophotometers. An increase in the photocatalytic activity was observed and attributed to an increase of the photo-absorption effect by the ZnO and the cooperative effect of the ACF.
Engineered Extracellular Vesicles as a Targeted Delivery Platform for Precision Therapy
Sun Yuntong,Sun Fengtian,Xu Wenrong,Qian Hui 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.2
Extracellular vesicles (EVs)-based cell-free strategy has shown therapeutic potential in tissue regeneration. Due to their important roles in intercellular communications and their natural ability to shield cargos from degradation, EVs are also emerged as novel delivery vehicles for various bioactive molecules and drugs. Accumulating studies have revealed that EVs can be modified to enhance their efficacy and specificity for the treatment of many diseases. Engineered EVs are poised as the next generation of targeted delivery platform in the field of precision therapy. In this review, the unique properties of EVs are overviewed in terms of their biogenesis, contents, surface features and biological functions, and the recent advances in the strategies of engineered EVs construction are summarized. Additionally, we also discuss the potential applications of engineered EVs in targeted therapy of cancer and damaged tissues, and evaluate the opportunities and challenges for translating them into clinical practice.
Sun, Qian,Zhu, Lei,Meng, Ze-Da,Ullah, Kefayat,Ye, Shu,Oh, Won-Chun The Korean Ceramic Society 2013 한국세라믹학회지 Vol.50 No.4
ACF and ZnO modified $TiO_2$ composite materials (ZnO-ACF/$TiO_2$) were prepared by a sol-gel method. The composites were characterized by X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis and scanning electron microscope (SEM) analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. The degradation of the MO was determined using UV spectrophotometers. An increase in the photocatalytic activity was observed and attributed to an increase of the photo-absorption effect by the ZnO and the cooperative effect of the ACF.
APPROACH TO CONTROL METHOD OF PLANNING LEVEL FOR EXCAVATING ROBOT
Qian, Sun Shou,Ming, Xu Hai,Jun, Wang Yi,Liang, He Bao 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
The method of path planning and trajectory planning are studied. The control of planning level for whole work cycle process and excavating process based on predetermined path and force monitor is realized on an experimental prototype. The software of three dimensional dynamic simulation is developed to examine the control method of planning level.
Qian Sun,Chun Zeng,Meng-Meng Xing,Bo Chen,Dan Zhao,San-Guo Hong,Ning Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6
Deliberately engineering oxide composites on constructing and manipulating interactive structures particularly in surface layers was highly desirable for heterogeneous catalysis. Herein, upon the redox replacement reaction between Ce(IV) precursor (Ce(NO3)2- 6)and Cu2O nanosubstrate, an attempt to directly engineer the surface structure of Cu-based substrate was performed by the Ce(IV)–Cu2O etching-embedding process, then the obtained powders were thermo-treated to get a series of Ce–O–Cu catalysts with different Ce:Cu molar ratios for NH3 selective catalytic reduction (NH3-SCR) of NO. Characterized by ICP-OES, XRD, Raman, XPS, SEM, BET, H2-TPR, NO- and NH3-TPD measurements, it was demonstrated that the Cu–O–Ce catalysts were structured as CuO matrix with an interactive surface composed by co-present Cu(I)–Cu(II) and Ce(III)–Ce(IV) species, even the introduction of Ce was confined in a quite low loading range (0.83–2.3 wt.%); such a surface exhibited the distinct synergistic effect with positively manipulated physical-chemistry properties such as active site distributions, redox features and surface reactivity compared to pure CuO and traditional Cu–Ce composite catalyst, leading to attractive catalytic performance such as ≥ 90% NO conversion with ≥ 95% N2 selectivity and the two-fold TOF enhancement versus traditional catalysts, even SO2 was present in reactant mixture on well-manipulated catalyst (Ce loading at 1.6 wt.%) These results indicated that the etching-embedding strategy illuminated in this work could be referred as a feasible method to directly engineer and construct interactive oxide composite surface for advanced application as well as current efficient Ce–O–Cu catalytic interface for heterogeneous catalysis.
Characteristics of Ga-Rich Cu(In,Ga)Se<sub>2</sub> Solar Cells Grown on Ga-Doped ZnO Back Contact
Sun, Qian,Kim, Kyoung-Bo,Jeon, Chan-Wook American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Wide bandgap Cu(In, Ga)Se-2 (CIGS) thin films were deposited on Ga-rich Ga: ZnO (GZO) or MoN/GZO by single-stage co-evaporation. CIGS/TCO interface phases, such as resistive n-type Ga2O3, which are likely to have formed during the high temperature growth of Ga-rich CIGS, can deteriorate the solar cell performance. Although some Ga accumulation was observed in both of the CIGS/GZO and CIGS/MoN/GZO interfaces formed at 520 degrees C, the Ga oxide layer was absent. On the other hand, their current-voltage characteristics showed strong roll-over behavior regardless of the MoN diffusion barrier. The strong Schottky barrier formation at the CIGS/GZO junction due to the low work function of GZO, was attributed to current blocking at a high forward bias.</P>