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Hua Zhang

Bio: Hua Zhang is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Medicine & Graphene. The author has an hindex of 163, co-authored 1503 publications receiving 116769 citations. Previous affiliations of Hua Zhang include Shenzhen University & Zhengzhou University.


Papers
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TL;DR: This work has performed optical spectroscopy in single CsPbBr3 nanoplatelets and observed a single photon emission without blinking and the PL emission exhibits excitonic fine structure peaks similar to what has been previously observed in nanocubes.
Abstract: Optically bright lead halide perovskite nanocrystals of different morphologies ranging from nanocubes to flat nanoplatelets to elongated nanowires have been reported. The morphology of the nanocrystals is expected to affect various properties such as the band edge energy and the electron-hole exchange interaction. However, aside from nanocubes, the investigation of optical properties in the lead halide perovskite nanocrystals of different morphologies at the single emitter level has been lacking. We have performed optical spectroscopy in single CsPbBr3 nanoplatelets and observed single photon emission without blinking. Furthermore, the photoluminescence emission exhibits excitonic fine structure peaks similar to what has been previously observed in nanocubes. Our work stimulates further investigations into the excitonic and quantum optics properties when the lateral size and morphology can be further controlled in lead halide perovskite nanocrystals.

42 citations

Journal ArticleDOI
Shulin Sun1, Z. Y. Tan1, Xiaodong Xu1, Chao Zhou1, Y. H. Ao1, Hua Zhang1 
TL;DR: Glycidyl methacrylate (GMA) functionalized acrylonitrile-butadiene-styrene (ABS) copolymers have been prepared via an emulsion polymerization process.
Abstract: Glycidyl methacrylate (GMA) functionalized acrylonitrile-butadiene-styrene (ABS) copolymers have been prepared via an emulsion polymerization process. The epoxy-functionalized ABS (e-ABS) particles were used to toughen nylon-6. Molau tests and FTIR results showed the reactions between nylon-6 and e-ABS have taken place. Scanning electron microscopy (SEM) displayed the compatibilization reaction between epoxy groups of e-ABS and nylon-6 chain ends (amine or carboxyl groups), which improve disperse morphology of e-ABS in the nylon-6 matrix. The presence of only a small amount of GMA (1 wt %) within the e-ABS copolymer was sufficient to induce a pronounced improvement of the impact strength of nylon-6 blends; whereas further increase of the GMA contents in e-ABS resulted in lower impact strength because of the crosslinking reaction between nylon-6 and e-ABS, resulting in agglomeration of the ABS particles. SEM results showed shear yielding of the nylon-6 matrix and cavitation of rubber particles were the major toughening mechanisms.

42 citations

Journal ArticleDOI
TL;DR: In this paper, two-dimensional (2D) square-like Au nanosheets with an unconventional 2H/face-centered cubic (fcc) heterophase, composing of two pairs of opposite edges with 2H and fcc phases, respectively, and two 2H /fcc heterophases basal planes, are prepared and then used as templates to grow one-dimensional Rh nanorods.
Abstract: Phase engineering of nanomaterials (PEN) enables the preparation of metal nanomaterials with unconventional phases that are different from their thermodynamically stable counterparts. These unconventional-phase nanomaterials can serve as templates to construct precisely controlled metallic heterostructures for wide applications. Nevertheless, how the unconventional phase of templates affects the nucleation and growth of secondary metals still requires systematic explorations. Here, two-dimensional (2D) square-like Au nanosheets with an unconventional 2H/face-centered cubic (fcc) heterophase, composing of two pairs of opposite edges with 2H/fcc heterophase and fcc phase, respectively, and two 2H/fcc heterophase basal planes, are prepared and then used as templates to grow one-dimensional (1D) Rh nanorods. The effect of different phases in different regions of the Au templates on the overgrowth of Rh nanorods has been systematically investigated. By tuning the reaction conditions, three types of 1D/2D Rh-Au heterostructures are prepared. In the type A heterostructure, Rh nanorods only grow on the fcc defects including stacking faults and/or twin boundaries (denoted as fcc-SF/T) and 2H phases in two 2H/fcc edges of the Au nanosheet. In the type B heterostructure, Rh nanorods grow on the fcc-SF/T and 2H phases in two 2H/fcc edges and two 2H/fcc basal planes of the Au nanosheet. In the type C heterostructure, Rh nanorods grow on four edges and two basal planes of the Au nanosheet. Furthermore, the type C heterostructure shows promising performance toward the electrochemical hydrogen evolution reaction (HER) in acidic media, which is among the best reported Rh-based and other noble-metal-based HER electrocatalysts.

42 citations

Journal ArticleDOI
TL;DR: In this article, a pre-rolled AZ31 magnesium alloy plate was processed by pre-rolling followed by warm compression, which resulted in a fine completely recrystallized microstructure.
Abstract: AZ31 magnesium alloy plates were processed by pre-rolling followed by warm compression. The corresponding microstructure evolution and mechanical properties were investigated in the present paper. The pre-introduced twins by pre-rolling increased the number of nucleation sites for dynamic recrystallization (DRX) during subsequent warm compression, which resulted in a fine completely recrystallized microstructure. With the increasing warm compression, more grains were recrystallized and the basal texture intensity was greatly strengthened. Finally, the average grain size was significantly refined from 31.9 μm to 2.0 μm by pre-rolling followed by warm compression. As a result, the AZ31 alloy plates processed by pre-rolling followed by warm compression exhibited higher yield stress and ultimate stress resulting from grain refinement without a reduction in elongation.

42 citations

Journal ArticleDOI
Huixin He1, Qi Guang Li1, Zheng Zhou1, Hua Zhang1, Sam Fong Yau Li1, Zhongfan Liu1 
10 Nov 2000-Langmuir
TL;DR: Geometrically defined gold microelectrode arrays are fabricated, in which a self-assembled monolayer of hexadecylmercaptan acts as passivation layer and is region-selectively formed by microcontact.
Abstract: Geometrically defined gold microelectrode arrays are fabricated, in which a self-assembled monolayer of hexadecylmercaptan acts as passivation layer and is region-selectively formed by microcontact...

42 citations


Cited by
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[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

01 May 1993
TL;DR: Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems.
Abstract: Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter-atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently—those with short-range forces where the neighbors of each atom change rapidly. They can be implemented on any distributed-memory parallel machine which allows for message-passing of data between independently executing processors. The algorithms are tested on a standard Lennard-Jones benchmark problem for system sizes ranging from 500 to 100,000,000 atoms on several parallel supercomputers--the nCUBE 2, Intel iPSC/860 and Paragon, and Cray T3D. Comparing the results to the fastest reported vectorized Cray Y-MP and C90 algorithm shows that the current generation of parallel machines is competitive with conventional vector supercomputers even for small problems. For large problems, the spatial algorithm achieves parallel efficiencies of 90% and a 1840-node Intel Paragon performs up to 165 faster than a single Cray C9O processor. Trade-offs between the three algorithms and guidelines for adapting them to more complex molecular dynamics simulations are also discussed.

29,323 citations

28 Jul 2005
TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1(PfPMP1)与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员,通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

18,940 citations

Journal ArticleDOI
TL;DR: This work reviews the historical development of Transition metal dichalcogenides, methods for preparing atomically thin layers, their electronic and optical properties, and prospects for future advances in electronics and optoelectronics.
Abstract: Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.

13,348 citations