Haiyan Wang

University of Houston, Houston, Texas, United States

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Publications (142)570.73 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A combined chemical pressure and substrate biaxial pressure crystal engineering approach was demonstrated for producing highly epitaxial Sm-doped BiMnO3 (BSMO) films on SrTiO3 single crystal substrates, with enhanced magnetic transition temperatures, TC of ~ 140 K, 40K higher than for standard BiMnO3 (BMO) films. Strong room temperature ferroelectricity with piezoresponse amplitude, d33 = 10pm/V and long term retention of polarisation were also observed. Furthermore, the BSMO films were much easier to grow than pure BMO films, with excellent phase purity over a wide growth window. The work represents a very effective way to independently control strain in-plane and out-of-plane which is important not just for BMO but for controlling properties of many other strongly correlated oxides.
    ACS Applied Materials & Interfaces 08/2014; · 5.01 Impact Factor
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    ABSTRACT: We report the observation of a strong 2D band Raman in twisted bilayer graphene (tBLG) with large rotation angles under 638 nm and 532 nm visible laser excitations. The 2D band Raman intensity increased four-fold as opposed to the two-fold increase observed in single-layer graphene. The same tBLG samples also exhibited rotation-dependent G-line resonances and folded phonons under 364 nm UV laser excitation. We attribute this 2D band Raman enhancement to the constructive interference between two double-resonance Raman pathways, which were enabled by a nearly degenerate Dirac band in the tBLG Moiré superlattices.
    Nanotechnology 07/2014; 25(33):335201. · 3.84 Impact Factor
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    ABSTRACT: We develop a novel device structure using easy-to-grow nanoscaffold films to localize oxygen vacancy at vertical heterointerfaces. Our strategy is to design vertical interfaces using two structurally incompatible oxides, which are likely to generate a high concentration oxygen vacancy. We demonstrate nonlinear electroresistance at room temperature using these nanoscaffold devices. The resistance variations exceed two orders of magnitude with very high uniformity and tunability.
    Advanced Materials 07/2014; · 14.83 Impact Factor
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    ABSTRACT: We, using LSMO:ZnO nanocomposite films as a model system, have studied the effect of film thickness on the physical properties of nanocomposites. It shows that strain, microstructure, as well as magnetoresistance strongly rely on film thickness. The magnetotransport properties have been fitted by a modified parallel connection channel model, which is in agreement with the microstructure evolution as a function of film thickness in nanocomposite films on sapphire substrates. The strain analysis indicates that the variation of physical properties in nanocomposite films on LAO is dominated by strain effect. These results confirm the critical role of film thickness on microstructures, strain states, and functionalities. It further shows that one can use film thickness as a key parameter to design nanocomposites with optimum functionalities.
    Scientific Reports 06/2014; 4:5426. · 5.08 Impact Factor
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    ABSTRACT: Self-assembled nanocomposite films and coatings have huge potential for many functional and structural applications. However, control and manipulation of the nanostructures is still at very early stage. Here, guidelines are established for manipulating the types of composite structures that can be achieved. In order to do this, a well studied (YBa2Cu3O7-δ)1-x:(BaZrO3)x ‘model’ system is used. A switch from BaZrO3 nanorods in YBa2Cu3O7-δ matrix to planar, horizontal layered plates is found with increasing x, with a transitional cross-ply structure forming between these states at x = 0.4. The switch is related to a release in strain energy which builds up in the YBa2Cu3O7-δ with increasing x. At x = 0.5, an unusually low strain state is observed in the planar composite structure, which is postulated to arise from a pseudo-spinodal mechanism.
    Advanced Functional Materials 06/2014; · 10.44 Impact Factor
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    ABSTRACT: Enterovirus 75 (EV-B75) is a member of the species Enterovirus B (EV-B). So far, only the complete genome of the prototype strain from the United States is available. Here, we report the genome sequence of an EV-B75 isolate from an acute flaccid paralysis patient in China. Sequence analysis revealed high nucleotide sequence divergence from foreign EV-B75 strains and suggested several recombination events with other serotypes of EV-B.
    Archives of Virology 05/2014; · 2.03 Impact Factor
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    ABSTRACT: Human enterovirus B73 (EV-B73) is a member of species Enterovirus B. To date, only one complete genome sequence of prototype strain CA55-1988 from California has been available. In this study, the complete genome analysis of an EV-B73 strain 088/SD/CHN/04 isolated from an acute flaccid paralysis case in Shandong Province, China in 2004 is conducted. It had 75.6 and 79.3 % nucleotide similarity with prototype strain CA55-1988 in the VP1 coding region and the complete genome, respectively. It had great VP1 nucleotide divergence (16.7-24.4 %) with EV-B73 strains from other parts of the world. Similarity plot and bootscanning analyses provided evidence of recombination with other EV-B viruses.
    Virus Genes 05/2014; · 1.77 Impact Factor
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    ABSTRACT: The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nano-pillar tunnel junction and a high spin polarization of up to 75 % at 5K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in terms of the Kondo scattering model. In addition, a decrease in spin polarization at low bias and hysteretic magneto-resistance at low temperatures are reported. The results open up new possibilities for spin-electronics and suggest exploration of other manganites-based materials for the room temperature spin-filter applications.
    Nano Letters 04/2014; · 13.03 Impact Factor
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    ABSTRACT: Vertically aligned nanocomposites with vertical interfaces are a novel concept which shows powerful advantages over conventional nanocomposites with lateral interfaces. However, significant obstacles to a systematic understanding of vertical interfaces still remain. Here, heteroepitaxial (BaTiO3)0.5:(Sm2O3)0.5 nanocomposite thin films have been fabricated and the conduction behaviors have been investigated. A spontaneous phase ordering with clear vertical interfaces has been found in the composite films. Because of the structural discontinuity as well as a large strain generated at the interfaces, the vertical interfaces are revealed to become the sinks to attract oxygen vacancies. The accumulated oxygen vacancies contributed to a largely reduced leakage current and a different leakage mechanism in the composite films compared to that of the pure BaTiO3 film. The present work represents a methodology to manipulate functionalities by designing configuration of the interfaces in oxide thin films.
    ACS Applied Materials & Interfaces 04/2014; · 5.01 Impact Factor
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    ABSTRACT: Very recently, vertically aligned nanocomposite (VAN) thin films have served as an intriguing platform to obtain significant insights of the fundamental physics and achieve novel functionalities for potential technological applications. In this review article, we have investigated the lattice mismatch and vertical interfacial coupling in representative VAN systems for probing strain engineering in the vertical direction. Systematic studies of ferroelectricity, low field magnetoresistance and magnetoelectric coupling in VAN architectures have been reviewed and compared. The enhancement and tunability of the physical properties are attributed to the effective strain-, phase- and interface- couplings in VAN films. In the end, important and promising research directions in this field are proposed, including understanding the growth mechanisms of VAN structures, and creating more effective couplings for enhanced functionalities and ultimate device applications.
    Current Opinion in Solid State and Materials Science 02/2014; 18:6-18. · 5.44 Impact Factor
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    ABSTRACT: In this work, cathodes consisting of a Mn–rich electrochemically inactive Li2MnO3 phase and a Li(Ni0.5Mn0.3Co0.2)O2 (NMC) phase are processed by pulsed laser deposition (PLD). Different from the traditional bulk/powder synthesis approach, pure materials of the two phases are either uniformly integrated by co-deposition of the two phases or deposited sequentially as a layered structure, to emulate Li-rich mixed phase cathode materials. A high deposition temperature, 750 °C, was used to grow the films on c-cut sapphire and stainless steel substrates. The films either in a random form or in a more controlled multilayer-type, both show excellent film quality. The multilayer composite films show superior capacity, cycling and rate capabilities, with a capacity of 293 mA h g−1 at 0.05 C. This method gives much better control of the Mn content of the cathode, phase purity and combination schemes, i.e., mixing at the atomic level or embedding Li2MnO3 domains of different sizes in the NMC matrix or both. Moreover, this approach can be applied to screen lithium-rich Mn phase and other novel material combinations in a more controlled and expedient manner.
    J. Mater. Chem. A. 01/2014; 2(7).
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    ABSTRACT: Transparent p-type nickel oxide (NiO) thin films have been epitaxially grown on (0001) Al2O3 substrates by a chemical solution method of polymer-assisted deposition for the first time. The films have a high optical transparency of above 95% in the wavelength range of 350-900 nm.
    Chemical Communications 01/2014; · 6.38 Impact Factor
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    ABSTRACT: Japanese encephalitis virus (JEV) can cause serious encephalitis and Culex mosquitoes are the primary vector. In 2013, a JE outbreak occurred in Shandong Province, China with 407 confirmed cases, including 11 deaths. An investigation on JEV in mosquitoes during the outbreak was conducted. A total of 14,719 mosquitoes were collected at 3 sites. For the 12,695 Culex tritaeniorhynchus mosquitoes, 88/201 pooled samples were positive by RT-PCR for the presence of the pre-membrane or envelope protein coding genes. The maximum likelihood estimates of JEV positive individuals per 1,000 vectors were 12.0, 7.2, and 6.0 in the 3 sites respectively with an overall estimate of 9.1. Phylogenetic analysis on these pre-membrane (n = 72) and envelope (n = 26) sequences with those of reference strains revealed they belonged to genotype I. This study describes the molecular epidemiology of JEV and suggests the high infection rate in mosquitoes is an important factor for the outbreak.
    Scientific Reports 01/2014; 4:4908. · 5.08 Impact Factor
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    ABSTRACT: Textured metastable VO2 (B) thin films with a layered structure were grown on SrTiO3 (001) by pulsed laser deposition. The X-ray diffraction and transmission electron microscopy results indicate that VO2 (B) films exhibit c-axis out-of-plane, while the films have 4 possible in-plane matching relations. In addition, a small amount of VO2 (M) phase can co-grow in the VO2 (B) phase when the film thickness exceeds a threshold. The thick VO2 films on STO exhibit a sharp metal-insulator transition with an increase of electrical conductivity in two orders of magnitude. This study may provide an alternative approach to enhance the performance of insulating VO2 (B) based batteries with increased electrical conductivity by incorporating VO2 (M) phase in the VO2 (B) phase layered network.
    Applied Physics Letters 01/2014; 104(7):071909-071909-4. · 3.79 Impact Factor
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    ABSTRACT: Enteroviruses (EVs) are important human pathogens associated with various clinical syndromes. This study represents an overview of non-polio enteroviruses (NPEVs) isolated from acute flaccid paralysis (AFP) surveillance in Shandong Province, China from 1988 to 2013. Altogether 792 and 170 NPEV isolates were isolated from stool specimens of 9263 AFP cases and 1059 contacts, respectively. Complete VP1 sequencing and typing on all 962 isolates revealed 53 NPEV types in which echovirus (E) 6 (7.6%), E14 (7.6%), E11 (7.4%), coxsackievirus (CV) B3 (7.4%), E25 (5.6%), CVB5 (4.9%), E7 (4.5%) and EV-A71 (4.4%) were the eight most commonly reported serotypes. Distinct summer-fall seasonality was observed, with June-October accounting for 79.3% of isolation from AFP cases with known month of specimen collection. Increase of isolation of EV-A71 and CVA-the predominant pathogens for the hand, foot, and mouth disease-was observed in recent years. Sequence analysis on VP1 coding region of EV-A71 and E6 suggested Shandong strains had great genetic divergence with isolates from other countries. The results described in this study provide valuable information on the circulation and emergence of different EV types in the context of limited EV surveillance in China.
    Scientific reports. 01/2014; 4:6167.
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    ABSTRACT: Self-assembled BiFeO3:CoFe2O4 (BFO:CFO) vertically aligned nanocomposite thin films have been fabricated on SrTiO3 (001) substrates using pulsed laser deposition. The strain relaxation mechanism between BFO and CFO with a large lattice mismatch has been studied by X-ray diffraction and transmission electron microscopy. The as-prepared nanocomposite films exhibit enhanced perpendicular magnetic anisotropy as the BFO composition increases. Different anisotropy sources have been investigated, suggesting that spin-flop coupling between antiferromagnetic BFO and ferrimagnetic CFO plays a dominant role in enhancing the uniaxial magnetic anisotropy.
    Applied Physics Letters 01/2014; 104(6):062402-062402-5. · 3.79 Impact Factor
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    ABSTRACT: Vertically aligned nanocomposites (VAN) combined ferrimagnetic CoFe2O4 with non-magnetic CeO2 ((CoFe2O4)x:(CeO2)1−x) in different phase ratios (x = 10%, 30% to 50%) have been grown by a pulsed laser deposition technique. Various unique magnetic domain structures form based on the VAN compositions and growth conditions. Anisotropic and tunable ferrimagnetic properties have been demonstrated. These ordered ferrimagnetic nanostructures have been incorporated into YBa2Cu3O7−δ thin films as both cap and buffer layers to enhance the flux pinning properties of the superconducting thin films. The results suggest that the ordered magnetic VAN provides effective pinning centers by both defect and magnetic nanoinclusions.
    Journal of Applied Physics 01/2014; 115(12):123902-123902-7. · 2.21 Impact Factor
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    ABSTRACT: Human enteroviruses (HEVs) are common causes of acute meningitis. However, there is limited information about HEV associated with aseptic meningitis in mainland China because it has not been classified as a notifiable disease. To characterize the HEVs associated with sporadic aseptic meningitis in China and to analyze their genetic features. Cerebrospinal fluid, throat swab and feces specimens were collected from patients with aseptic meningitis in 5 sentinel hospitals in Shandong Province, China between 2006 and 2012. Virological investigation (viral isolation and molecular identification) and phylogenetic analysis were performed. A total of 437 hospitalized patients were reported, and enteroviruses were detected in the specimens from 84 patients (19.2%) and were identified into 17 serotypes. The nine main serotypes were echovirus (E) 30 (27.4%), EV71 (13.1%), coxsackievirus (CV) B1 (9.5%), CVB3 (7.1%), CVB5 (7.1%), E6 (7.1%), E9 (7.1%), CVA9 (6.0%), and CVA10 (3.6%). Monthly distribution of isolated enteroviruses revealed a major peak in summer-fall season and a small second peak in winter constituted totally by EV71. Sequence analysis on VP1 coding region suggested Shandong strains had great genetic divergence with isolates from other countries. Multiple serotypes were responsible for enterovirus meningitis in mainland China. Aseptic meningitis caused by EV71 and coxsackie A viruses-the predominant pathogens for the hand, foot, and mouth disease-is currently an important concern in mainland China.
    PLoS ONE 01/2014; 9(2):e89766. · 3.53 Impact Factor
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    ABSTRACT: The S100 protein family member S100A4 regulates various cellular functions. Previous studies have shown that elevated expression of S100A4 is associated with progression and metastasis of colorectal cancer (CRC). However, little is known about whether and how S100A4 contributes to CRC development. In our present study, the elevated expression of S100A4 in CRC tissues compared to matched adjacent normal tissues was confirmed by immunohistochemistry, semi-quantitative RT-PCR and Western blot. Adenovirus-mediated S100A4 overexpression obviously enhanced viability and migration of CRC cells, which was detected by MTT assay and transwell assay, respectively. Additionally, S100A4 overexpression increased the phosphorylation levels of Akt, mTOR and p70S6K. These effects of S100A4 were abolished by treatment with either the specific PI3K/Akt inhibitor LY294002, or the specific mTOR/p70S6K inhibitor rapamycin. Furthermore, overexpression of S100A4 resulted in upregulation of VEGF and downregulation of E-cadherin, which were strongly reversed by either LY294002 or rapamycin. Altogether, our results demonstrate that activation of the PI3K/Akt/mTOR/p70S6K signaling pathway is involved in S100A4-induced viability, migration, upregulation of VEGF and downregulation of E-cadherin in CRC cells.
    International journal of medical sciences. 01/2014; 11(8):841-9.
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    ABSTRACT: The S100A6 protein, a member of the S100 protein family, is overexpressed in many tumors including colorectal carcinoma (CRC). Although recent studies showed that the elevated expression of S100A6 was associated with the stage and lymphatic permeation of CRC, little is known about whether and how S100A6 contributes to CRC development. Here we investigated the S100A6 expression in CRC tissues and cell lines, and explored the molecular mechanisms underlying the role of S100A6 in CRC development by examining cell proliferation and migration in vitro, and tumorigenicity in nude mice. The results show that S100A6 expression was markedly increased in CRC tissues and cell lines compared to normal colon tissues and a normal colon mucosal epithelial cell line, respectively. Recombinant adenovirus-mediated overexpression of S100A6 or treatment with recombinant S100A6 protein in HCT116, a CRC cell line with relative low S100A6 expression, resulted in enhanced cell proliferation and migration, and the mitogen-activated protein kinase (MAPK) activation in vitro, and tumor growth in vivo. Conversely, RNAi-mediated knockdown of S100A6 in LoVo, a CRC cell line with relative high S100A6 expression, resulted in reduced cell proliferation, migration and MAPK activity. S100A6-induced proliferation was partially attenuated by an ERK inhibitor while migration was suppressed by a p38 inhibitor. Taken together, our results suggest that the cellular effects of S100A6 are mediated by the ERK and p38 MAPK pathways, and modulation of these pathways may be employed for CRC prevention and therapy.
    International Journal of Oncology 12/2013; · 2.66 Impact Factor

Publication Stats

428 Citations
570.73 Total Impact Points

Institutions

  • 2014
    • University of Houston
      • Center for Advanced Materials
      Houston, Texas, United States
  • 2012–2014
    • Shandong University
      • School of Public Health
      Chi-nan-shih, Shandong Sheng, China
    • Shandong University of Traditional Chinese Medicine
      Shan-tang, Jiangxi Sheng, China
  • 2008–2014
    • Texas A&M University
      • • Materials Science and Engineering Program
      • • Department of Electrical and Computer Engineering
      College Station, Texas, United States
  • 2013
    • Chongqing Medical University
      Ch’ung-ch’ing-shih, Chongqing Shi, China
    • Soochow University (PRC)
      • School of Physical Science and Technology School of Energy
      Suzhou, Jiangsu Sheng, China
  • 2011–2012
    • Jiangsu Provincial Center for Disease Control and Prevention
      Chiang-tu, Jiangsu Sheng, China
    • Huazhong University of Science and Technology
      • Wuhan National Laboratory for Optoelectronics
      Wu-han-shih, Hubei, China
    • Beijing Centers for Disease Control and Prevention
      Peping, Beijing, China
    • Chinese Center For Disease Control And Prevention
      • Institute for Viral Disease Control and Prevention
      Beijing, Beijing Shi, China
    • Tsinghua University
      Peping, Beijing, China
  • 2009–2012
    • Los Alamos National Laboratory
      • Materials Physics and Applications Division
      Los Alamos, NM, United States
  • 2008–2012
    • University of Cambridge
      • Department of Materials Science and Metallurgy
      Cambridge, ENG, United Kingdom
  • 2007
    • Texas A&M University - Kingsville
      Kingsville, Texas, United States
  • 2001
    • North Carolina State University
      • Department of Materials Science and Engineering
      Raleigh, NC, United States