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1.
Chiang LY Padmawar PA Canteenwala T Tan LS He GS Kannan R Vaia R Lin TC Zheng Q Prasad PN 《Chemical communications (Cambridge, England)》2002,(17):1854-1855
The first, highly two-photon active C60 derivative comprised of a A-sp3-D conjugate structure was synthesized showing effective two-photon absorption cross-sections (sigma 2' = 196 x 10(-48) cm4 sec-1 molecule-1) in the nanosecond regime among the best values for diphenylaminofluorene-based AFX chromophores. 相似文献
2.
Wenbin Shu Yitai Xiao Lizhu Wang Mingzhu Liang Zhihong Li Xiangwen Wu Qingdong Cao 《Molecules (Basel, Switzerland)》2022,27(21)
Esophageal squamous cell carcinoma (ESCC) is one of the most lethal malignancies globally. Peptide-based tumor-targeted imaging is critical for ESCC imaging. In this study, we aim to identify a peptide-targeting IGF2BP2 that specifically binds to human ESCC for near-infrared imaging of esophageal cancer. Applying phage display techniques, we identified a peptide target for IGF2BP2 which was confirmed to be highly expressed in ESCC cell lines or tumor tissue and may serve as an imaging target for ESCC. We conjugated the peptide to the NIRF group, Cy5, and further evaluated the targeting efficacy of the probe at a cellular level and in animal tumor models. The Cy5 conjugated peptide (P12-Cy5) showed a high binding affinity to human ESCC cells in vitro. In vivo, optical imaging also validated the tumor-targeting ability of P12-Cy5 in KYSE-30-bearing subcutaneous ESCC tumor models. Furthermore, the results of biodistribution showed a significantly higher fluorescence intensity in tumors compared to scrambled peptide, which is consistent with in vivo observations. In summary, an IGF2BP2-targeted peptide was successfully identified. In vitro and in vivo experiments confirmed that P12-Cy5 has high affinity, specificity and tumor-targeting properties. Thus, P12-Cy5 is a prospective NIR probe for the imaging of ESCC. 相似文献
3.
半导体复合TiO2纳米光催化剂 总被引:12,自引:0,他引:12
对近年来利用半导体复合TiO2纳米光催化剂进行了介绍。总结了复合TiO2纳米光催化剂的制备、复合物的种类、光催化机理以及影响半导体复合TiO2光催化性能的因素。 相似文献
4.
采用电化学手段以及Mott-Schottky理论, 并结合氧化膜点缺陷模型(PDM)分析研究了Co-W合金镀层在1 mol• L-1 NaOH溶液中表面氧化膜的半导体性质, 并分别计算出了不同W含量的Co-W合金镀层在-0.15, -0.25和-0.35 V三个不同电位下阳极氧化后氧化膜的供体密度、平带电位及氧空穴扩散系数. 结果表明, Co-W合金镀层在1 mol•L-1 NaOH溶液中表面氧化膜的Mott-Schottky曲线线性区斜率为正, 表现出N型半导体性质|随着阳极氧化电位的升高或合金镀层W含量的降低, 氧化膜供体密度ND逐渐增大, 导致氧化膜被破坏或发生点蚀的几率升高|随着阳极氧化电位的降低或合金镀层W含量的降低, 氧化膜平带电位呈降低趋势, 说明其耐蚀性升高|不同W含量的Co-W合金镀层在三个不同电位下阳极氧化后的氧化膜的氧空穴扩散系数为(1.543~8.533)×10-14 cm2•s-1. 相似文献
5.
Shan‐Ci Chen Qingdong Zheng Qikai Zhang Dongdong Cai Jinyun Wang Zhigang Yin Changquan Tang 《Journal of polymer science. Part A, Polymer chemistry》2013,51(9):1999-2005
An angular‐shaped naphthalene tetracarboxylic diimide (NDI) was designed and synthesized as a new building block for n‐type conjugated polymers to tune their energy levels. Three n‐type copolymers incorporating this angular‐shaped NDI as the acceptor moiety were obtained by Stille coupling reactions and had number average molecular weights of 18.7–73.0 kDa. All‐polymer bulk‐heterojunction solar cells made from blends of these polymers with poly(3‐hexylthiophene) gave a power conversion efficiency up to 0.32% and exhibited an open‐circuit voltage (Voc) up to 0.94 V due to their relative high‐lying lowest unoccupied molecular orbital energy levels. The high Voc of 0.94 V is higher than that of solar cells based on linear‐shaped NDI‐containing polymers (<0.6 V). The results indicate that the angular‐shaped NDI is a promising building block for constructing nonfullerene polymer acceptors for solar cells with high open‐circuit voltages. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013 相似文献
6.
The unsteady, three-dimensional full Navier-Stokes equations are solved using a Beam-Warming implicit algorithm in this paper. Computations of the flow over a 76° sweep delta wing at 36.5° angle of attack is presented. The sectional streamlines are depicted and the evolution of the instantaneous crossflow topology of the leading-edge vortex is analyzed. It is found that, along the axis, the topology of the primary vortex alters several times starting from stable focus near the apex to unstable focus, and lasts back to stable focus near wake edge; The stable limit cycle and unstable limit cycle are shown in this evolution. These various altering topologies stem from the stretching and compression of the vortex core. 相似文献
7.
8.
通过提出一种针对三维四面体网格的区域整形技术,给出了一种简便实用的四面体网格局部自适应加密方法,并将其与流量修正有限元法结合,应用于三维高速流的计算 相似文献
9.
爆炸金属管绝热剪切断裂的细观研究 总被引:5,自引:3,他引:5
介绍了正火及调质后45号钢、TC4钛合金和钨合金四种金属管在内部高能炸药加载下,破片宏观剪切断口的细观断裂形貌;观察到这四种金属管不同的细观剪切断裂机制。根据金相研究及物理分析表明,金属材料的热导率越低,晶粒越细,则越容易产生绝热剪切,生成相变带。 相似文献
10.
对两种热处理条件不同的TC4钛合金圆筒在内部爆轰加载下的自然破片形成过程作了研究,并对破片的宏观断裂特征和细观断裂机理进行了分析。研究结果表明,一些引燃战斗部采用钛合金壳体的根本原因在于利用壳体破裂时形成的高温绝热剪切带和钛元素本身在高温下的剧烈氧化性。 相似文献