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Michael C Lucking, Weiyu Xie, Duk-Hyun Choe, Damien West, Toh-Ming Lu, S B Zhang
Interest in two-dimensional materials has exploded in recent years. Not only are they studied due to their novel electronic properties, such as the emergent Dirac fermion in graphene, but also as a new paradigm in which stacking layers of distinct two-dimensional materials may enable different functionality or devices. Here, through first-principles theory, we reveal a large new class of two-dimensional materials which are derived from traditional III-V, II-VI, and I-VII semiconductors. It is found that in the ultrathin limit the great majority of traditional binary semiconductors studied (a series of 28 semiconductors) are not only kinetically stable in a two-dimensional double layer honeycomb structure, but more energetically stable than the truncated wurtzite or zinc-blende structures associated with three dimensional bulk...
February 23, 2018: Physical Review Letters
Sopita Wongin, Saranatra Waikakul, Pojchong Chotiyarnwong, Wanwipa Siriwatwechakul, Masahiro Kino-Oka, Mee-Hae Kim, Kwanchanok Viravaidya-Pasuwat
BACKGROUND: Dedifferentiation of chondrocytes during cell expansion is one of the barriers in tissue construction for cartilage repair. To understand chondrocyte behavior and improve cell expansion in monolayer culture, this study investigated the effects of morphological changes and cellular aggregation on the maintenance of chondrogenic capacity by observing the expression patterns of chondrogenic (collagen type II and aggrecan) and dedifferentiation (collagen type I) markers. Primary human chondrocytes were cultured on either a polystyrene surface (PS) or a polyamidoamine dendrimer surface with a fifth-generation (G5) dendron structure to create a one-step process of cell expansion and the maintenance of chondrogenic activities prior to the construction of cell sheets...
March 14, 2018: BMC Biotechnology
Maohuan Lin, Zizhuo Su, Jiajie Li, Ruqiong Nie, Jingfeng Wang
A honeycomb-like structure (HLS) is a rare entity encountered in catheterization laboratories. The etiology of HLS remains elusive. Moreover, no treatment guideline or consensus for HLS has been proposed. However, with more frequent adoption of intravascular imaging modalities, the number of cases of HLS is rising. We herein present a case of HLS and summarize previous reports in the literature with the aim of providing useful information for interventional cardiologists and promoting further research.
January 1, 2018: Journal of International Medical Research
Junzhe Li, Shaohua Luo, Xueyong Ding, Qing Wang, Ping He
In the efforts towards the rapidly increasing demands for high-power application, the cathode materials with three-dimensional (3D) architectures have been proposed. Here, we report the construction of the 3D LiAlO2-LiMnPO4/C cathode materials for lithium ion batteries in an innovation way. The as-prepared 3D active materials LiMnPO4/C and the honeycomb-like Li-ion conductor LiAlO2 framework are used as working electrode directly without additional usage of polymeric binder. The electrochemical performance has been improved significantly due to the special designed core-shell architectures of LiMnPO4/C@LiAlO2...
March 12, 2018: ACS Applied Materials & Interfaces
Donato Girolamo, Huan-Yu Chang, Fuh-Gwo Yuan
A fully non-contact laser-based nondestructive inspection (NDI) system is developed to detect and visualize damage in structures. The study focuses on the size quantification and characterization of a barely visible impact damage (BVID) in a honeycomb composite panel. The hardware consists of a Q-switched Nd:YAG pulse laser that probes the panel by generating broadband guided waves via thermo-elastic expansion. The laser, in combination with a set of galvano-mirrors is used to raster scan over a two-dimensional surface covering the damaged region of an impacted quasi-isotropic [60/0/-60]s honeycomb composite panel...
February 16, 2018: Ultrasonics
Athmane Tadjine, Christophe Delerue
The synthesis of self-assembled semiconductor nanocrystal (NC) superlattices using oriented attachment recently became a flourishing research topic. This technique already produced remarkable forms of NC superlattices, such as linear chains, mono and multilayer square lattices, and silicene-like honeycomb lattices. In the case of lead chalcogenide semiconductors where NCs are in the form of truncated nanocubes, the attachment mostly occurs via (100) facets. In this work, we show that all these structures can be seen as sub-structures of a simple cubic lattice...
March 9, 2018: Physical Chemistry Chemical Physics: PCCP
Lei Gao, Jia-Tao Sun, Jian-Chen Lu, Hang Li, Kai Qian, Shuai Zhang, Yu-Yang Zhang, Tian Qian, Hong Ding, Xiao Lin, Shixuan Du, Hong-Jun Gao
2D transition metal chalcogenides have attracted tremendous attention due to their novel properties and potential applications. Although 2D transition metal dichalcogenides are easily fabricated due to their layer-stacked bulk phase, 2D transition metal monochalcogenides are difficult to obtain. Recently, a single atomic layer transition metal monochalcogenide (CuSe) with an intrinsic pattern of nanoscale triangular holes is fabricated on Cu(111). The first-principles calculations show that free-standing monolayer CuSe with holes is not stable, while hole-free CuSe is endowed with the Dirac nodal line fermion (DNLF), protected by mirror reflection symmetry...
March 8, 2018: Advanced Materials
X-Q Shi, J Li, L Qian, X Xue, J Li, W Wan
AIM: To correlate elastic parameters with collagen fibre shape and arrangement features in breast lesions. MATERIALS AND METHODS: Shear-wave elastography (SWE) was used to measure the stiffness of breast lesions in 54 patients before surgical removal. The value of stiffness was expressed as the mean and maximum elasticity (Emean and Emax). Lesions were sliced and stained with picric acid-sirius red to display the extracellular matrix (ECM) collagen fibre. The categories of the collagen fibres were based on the shape and arrangement features, i...
March 3, 2018: Clinical Radiology
Xue-Kun Chen, Jun Liu, Dan Du, Zhong Xie, Ke-Qiu Chen
Carbon honeycomb, a new kind of three-dimensional carbon allotrope experimentally synthesized recently, has received much attention for its fascinating applications in electronic device and energy storage. In the present work, we perform equilibrium molecular dynamics (EMD) to study the thermal transport properties of carbon honeycombs with different chirality. It is found that the thermal conductivity along the honeycomb axis (<i>κ<sub>x</sub></i> ) is three times larger than that normal to the axis (<i>κ<sub>z</sub></i>), which shows strong anisotropy reflecting their geometric anisotropy...
March 2, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Héctor Sánchez-Esquivel, Karen Y Raygoza-Sanchez, Raúl Rangel-Rojo, Boris Kalinic, Niccolò Michieli, Tiziana Cesca, Giovanni Mattei
In this work we present the study of the ultra-fast dynamics of the nonlinear optical response of a honeycomb array of silver triangular nanoprisms, performed using a femtosecond pulsed laser tuned with the dipolar surface plasmon resonance of the nanoarray. Nonlinear absorption and refraction, and their time-dependence, were explored using the z-scan and time-resolved excite-probe techniques. Nonlinear absorption is shown to change sign with the input irradiance and the behavior was explained on the basis of a three-level model...
March 1, 2018: Nanoscale
Ge'er Zhang, Zimin Pan
OBJECTIVE: To analyze the clinical features, diagnosis and treatment of gestational trophoblastic diseases in cesarean scar. METHODS: Clinical data of three cases of gestational trophoblastic diseases in cesarean scar diagnosed in Women's Hospital, Zhejiang University School of Medicine during December 2011 and December 2016 were collected. And literature search was performed in Wanfang data, VIP, CNKI, PubMed, ISI Web of Knowledge and EMbase database. RESULTS: A total of 20 cases of gestational trophoblastic diseases were included in the analysis...
May 25, 2017: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
Yimin Yao, Xiaodong Zhu, Xiaoliang Zeng, Rong Sun, Jian-Bin Xu, Ching-Ping Wong
Efficient heat removal via thermal management materials has become one of the most critical challenges in the development of modern microelectronic devices. However, previously reported polymer composites exhibit limited enhancement of thermal conductivity even when highly loaded with thermally conductive fillers due to the lack of efficient heat transfer pathways. Herein, we report vertically aligned and interconnected SiC nanowire networks as efficient filler for polymer composites achieving significantly enhanced thermal conductivity...
February 28, 2018: ACS Applied Materials & Interfaces
Wei Xu, Ya-Nan Ren, Miao Xie, Lin-Xia Zhou, Yue-Qing Zheng
A new series of uranium coordination polymers have been hydrothermally synthesized by using 1,4-naphthalene dicarboxylic acid (H2 NDC), namely, (H3 O)2 [(UO2 )2 (NDC)3 ]·H2 O (1), (H2 -bpp)[(UO2 )2 (NDC)3 ]·EtOH·5H2 O (2), (H2 -bpe)2/2 [(UO2 )2 (NDC)3 ]·EtOH (3), (H2 -bpp)[(UO2 )2 (NDC)3 ]·5H2 O (4), (H2 -bpp)[(UO2 )(HNDC)(NDC)]2 ·2H2 O (5), and (H2 -bpy)[(UO2 )(NDC)2 ] (6) [bpp = 1,3-di(4-pyridyl) propane, bpe = 4,4'-vinylenedipyridine, bpy = 4,4'-bipyridine]. Single-crystal X-ray diffraction demonstrates that complex 1 represents the uranyl-organic polycatenated framework derived from a simple two-dimensional honeycomb grid network structure via a H2 NDC linker...
February 27, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jiho Noh, Sheng Huang, Kevin P Chen, Mikael C Rechtsman
We experimentally demonstrate topological edge states arising from the valley-Hall effect in two-dimensional honeycomb photonic lattices with broken inversion symmetry. We break the inversion symmetry by detuning the refractive indices of the two honeycomb sublattices, giving rise to a boron nitridelike band structure. The edge states therefore exist along the domain walls between regions of opposite valley Chern numbers. We probe both the armchair and zigzag domain walls and show that the former become gapped for any detuning, whereas the latter remain ungapped until a cutoff is reached...
February 9, 2018: Physical Review Letters
Y J Yu, Y Xu, K J Ran, J M Ni, Y Y Huang, J H Wang, J S Wen, S Y Li
Recently, there have been increasingly hot debates on whether there exists a quantum spin liquid in the Kitaev honeycomb magnet α-RuCl_{3} in a high magnetic field. To investigate this issue, we perform ultralow-temperature thermal conductivity measurements on single crystals of α-RuCl_{3} down to 80 mK and up to 9 T. Our experiments clearly show a field-induced phase transition occurring at μ_{0}H_{c}≈7.5  T, above which the magnetic order is completely suppressed. The minimum of thermal conductivity at 7...
February 9, 2018: Physical Review Letters
Hongju Zeng, Wang Wang, Jun Li, Jin Luo, Shengli Chen
Heteroatoms doping is able to produce catalytic sites in carbon materials for oxygen reduction reaction (ORR); while hierarchically porous structure is necessary for efficient exposure and accessibility of the usually limited catalytic sites in such activated carbon catalysts. This work reports an in-situ generated dual-template method to synthesis the Fe/N/S co-doped hierarchically porous carbon (FeNS/HPC), with NaCl crystallites formed during the precursor lyophilization process as the primary template to generate ~500 nm macropores with ultrathin graphene-like carbon-layer walls, and Fe3O4 nanoparticles formed during the high-temperature carbonization process as the secondary template to produce mesopores on the walls of macropores...
February 26, 2018: ACS Applied Materials & Interfaces
Tian-Qun Song, Jie Dong, An-Fei Yang, Xue-Jing Che, Hong-Ling Gao, Jian-Zhong Cui, Bin Zhao
Two isostructural 2D MOFs ([Ln7 (CDA)6 (HCOO)3 (μ3 -OH)6 (H2 O)8 ]n , abbreviated as 1-Gd and 2-Dy) were successfully synthesized under solvothermal conditions. The self-assembly of lanthanide(III) nitrate and 1,1'-cyclopropane-dicarboxylic acid (H2 CDA) resulted in wheel-like Ln18 cluster second building units (SBU), which are further linked to six neighboring wheels to generate a 2D ordered honeycomb array. Both 1-Gd and 2-Dy exhibit high thermal stability and decompose above 330 °C. Moreover, they have good solvent stability in ten common solvents and pH stability with pH values from 1 to 13...
February 26, 2018: Inorganic Chemistry
Dize Li, Zhiqiang Yang, Tao Chen, Chao Guan, Feilong Wang, Ethan L Matz, Yuanyuan Zhang, Ping Ji
Cone beam computed tomography (CBCT) has obvious advantages over regular radiography in diagnosis of complex diseases. Objective of this study is to report a case of a mandibular jaw ameloblastoma recurring cyst, which represents a benign tumor of odontogenic epithelium, using CBCT imaging technology. CBCT examination of the patient suffering with recurrent lower jaw cyst (relapsing four years after surgery) showed a decrease in irregular bone density and appearance of a honeycomb pattern (3.5 cm×2.5 cm×1...
2018: Journal of X-ray Science and Technology
Rui Li, Guanglin Yu, Samira Azarin, Allison Hubel
Inadequate preservation methods of human induced pluripotent stem cells (hiPSCs) have impeded efficient reestablishment of cell culture after freeze-thaw. In this study, we examined the roles of cooling rate, seeding temperature and the difference between cell aggregates (3-50 cells) and single cells in controlled rate freezing of hiPSCs. Intracellular ice formation (IIF), post-thaw membrane integrity, cell attachment, apoptosis and cytoskeleton organization were evaluated to understand the different freezing responses between hiPSC single cells and aggregates, among cooling rates of 1, 3, 10˚C/min, and between seeding temperatures of -4, -8˚C...
February 25, 2018: Tissue Engineering. Part C, Methods
Carlos Jared, Pedro Luiz Mailho-Fontana, Rafael Marques-Porto, Juliana Mozer Sciani, Daniel Carvalho Pimenta, Edmund D Brodie, Marta Maria Antoniazzi
Amphibian skin is rich in mucous glands and poison glands, secreting substances important for gas exchange and playing a fundamental role in chemical defense against predators and microorganisms. In the caecilian Siphonops annulatus (Mikan, 1920) we observed a concentration of enlarged mucous glands in the head region. In the posterior region of the body a similar concentration is made up of enlarged poison glands. These accumulations of glands structurally resemble the macroglands previously reported in anurans and salamanders...
February 23, 2018: Scientific Reports
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