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Zheng-Xin Liu, B Normand
Motivated by recent experimental observations in α-RuCl_{3}, we study the K-Γ model on the honeycomb lattice in an external magnetic field. By a slave-particle representation and variational Monte Carlo calculations, we reproduce the phase transition from zigzag magnetic order to a field-induced disordered phase. The nature of this state depends crucially on the field orientation. For particular field directions in the honeycomb plane, we find a gapless Dirac spin liquid, in agreement with recent experiments on α-RuCl_{3}...
May 4, 2018: Physical Review Letters
Merve Gultekinoglu, Xinyue Jiang, Cem Bayram, Kezban Ulubayram, Mohan Edirisinghe
Amphiphilic block copolymers are widely used in science owing to their versatile properties. In this study, amphiphilic block copolymer poly(lactic-co-glycolic acid)-block-poly(ethylene glycol) (PLGA-b-PEG) was used to create micro droplets in a T-junction microfluidic device with a well-defined geometry. In order to compare interfacial characteristics of micro droplets, dichloromethane (DCM) and chloroform were used to prepare PLGA-b-PEG solution as an oil phase. In the T-junction device water and oil phases were manipulated at variable flow rates from 50 µL/min to 300 µL/min by increments of 50 µL/min...
May 18, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yonggang Wang, Jianjun Ying, Zhengyang Zhou, Junliang Sun, Ting Wen, Yannan Zhou, Nana Li, Qian Zhang, Fei Han, Yuming Xiao, Paul Chow, Wenge Yang, Viktor V Struzhkin, Yusheng Zhao, Ho-Kwang Mao
The discovery of iron-based superconductors (FeSCs), with the highest transition temperature (Tc ) up to 55 K, has attracted worldwide research efforts over the past ten years. So far, all these FeSCs structurally adopt FeSe-type layers with a square iron lattice and superconductivity can be generated by either chemical doping or external pressure. Herein, we report the observation of superconductivity in an iron-based honeycomb lattice via pressure-driven spin-crossover. Under compression, the layered FePX3 (X = S, Se) simultaneously undergo large in-plane lattice collapses, abrupt spin-crossovers, and insulator-metal transitions...
May 15, 2018: Nature Communications
G Kokolakis, L von Eichel, M Ulrich, J Lademann, T Zuberbier, M A Hofmann
INTRODUCTION: Fractionated radiofrequency (RF) tissue tightening is an alternative method to fractionated laser treatment of skin wrinkling, laxity and acne scars, with reduced risk of scarring or persistent pigmentation. The aim of this study was to evaluate and quantify the wound healing process after RF treatment. MATERIALS AND METHODS: 12 patients were treated with a 64-pin fractional bipolar RF device with 60 mJ/pin applied energy. Confocal laser scanning microscopy (CLSM) examination was performed on day 1, day 2, day 7 and day 14 after treatment...
May 15, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Kun Jiang, Sen Zhou, Xi Dai, Ziqiang Wang
We investigate a new class of topological antiferromagnetic (AF) Chern insulators driven by electronic interactions in two-dimensional systems without inversion symmetry. Despite the absence of a net magnetization, AF Chern insulators (AFCI) possess a nonzero Chern number C and exhibit the quantum anomalous Hall effect (QAHE). Their existence is guaranteed by the bifurcation of the boundary line of Weyl points between a quantum spin Hall insulator and a topologically trivial phase with the emergence of AF long-range order...
April 13, 2018: Physical Review Letters
Kirill Plekhanov, Ivana Vasić, Alexandru Petrescu, Rajbir Nirwan, Guillaume Roux, Walter Hofstetter, Karyn Le Hur
Recently, the frustrated XY model for spins 1/2 on the honeycomb lattice has attracted a lot of attention in relation with the possibility to realize a chiral spin liquid state. This model is relevant to the physics of some quantum magnets. Using the flexibility of ultracold atom setups, we propose an alternative way to realize this model through the Mott regime of the bosonic Kane-Mele-Hubbard model. The phase diagram of this model is derived using bosonic dynamical mean-field theory. Focusing on the Mott phase, we investigate its magnetic properties as a function of frustration...
April 13, 2018: Physical Review Letters
Hongzhe Pan, Yin Han, Jianfu Li, Hongyu Zhang, Youwei Du, Nujiang Tang
To obtain high-performance spintronic devices with high integration density, two-dimensional (2D) half-metallic materials are highly desired. Herein, we proposed a stable 2D material, i.e., the Mg3C2 monolayer, with a honeycomb-kagome lattice based on the particle-swarm optimization algorithm and first-principles calculations. This monolayer is an anti-ferromagnetic (AFM) semiconductor in its ground state. We have also demonstrated that a transition from an AFM semiconductor to a ferromagnetic half-metal in this 2D material can be induced by carrier (electron or hole) doping...
May 14, 2018: Physical Chemistry Chemical Physics: PCCP
Stefan Chisca, Valentina-Elena Musteata, Rachid Sougrat, Ali Reza Behzad, Suzana P Nunes
Hierarchical porous materials that replicate complex living structures are attractive for a wide variety of applications, ranging from storage and catalysis to biological and artificial systems. However, the preparation of structures with a high level of complexity and long-range order at the mesoscale and microscale is challenging. We report a simple, nonextractive, and nonreactive method used to prepare three-dimensional porous materials that mimic biological systems such as marine skeletons and honeycombs...
May 2018: Science Advances
Shane Lawson, Qasim Al-Naddaf, Anirudh Krishnamurthy, Marc St Amour, Connor Griffin, Ali Asghar Rownaghi, James C Knox, Fateme Rezaei
Honeycomb monoliths loaded with metal-organic frameworks (MOFs) are highly desirable adsorption contactors because of their low pressure drop, rapid mass transfer kinetics, and high adsorption capacity. Moreover, 3D printing technology renders direct material modification a realistic and economic prospect. In this work, 3D printing was utilized to impregnate kaolin-based monolith with UTSA-16 metal formation precursor (Co) whereupon an internal growth was facilitated via a solvothermal synthesis approach. The cobalt weight loading in the kaolin support was varied systematically to optimize the MOF growth while retaining monolith mechanical integrity...
May 11, 2018: ACS Applied Materials & Interfaces
Chao Zhang, Yuming Zhou, Jiehua Bao, Xiaoli Sheng, Jiasheng Fang, Shuo Zhao, Yiwei Zhang, Wenxia Chen
The halogen elements modification strategy of TiO2 encounters a bottleneck in visible-light H2 production. Herein, we have for the first time reported a hierarchical honeycomb Br, N codoped anatase TiO2 catalyst (HM-Br,N/TiO2) with enhanced visible-light photocatalytic H2 production. During the synthesizing process, large amounts of meso-macroporous channels and TiO2 nanosheets were fabricated in massive TiO2 automatically, constructing the hierarchical honeycomb structure with large specific surface area (464 m2 g-1)...
May 10, 2018: ACS Applied Materials & Interfaces
Shengjie Huang, Chunfen Wang, Jingwei Xu, Lie Ma, Changyou Gao
Hyaluronic acid (HA)-based hydrogels have applied widely for biomedical applications due to its biocompatibility and biodegradability. However, the use of initiators or crosslinkers during the hydrogel formation may cause cytotoxicity and thereby impair the biocompatibility. Inspired by the crosslinking mechanism of fibrin gel, a novel HA-based hydrogel was developed via the in situ supramolecular assembly based on knob-hole interactions between fibrinogen and knob-grafted HA (knob-g-HA) in this study. The knob-grafted HA was synthesized by coupling knob peptides (GPRPAAC, a mimic peptide of fibrin knob A) to HA via Michael addition...
December 2017: Bioactive Materials
Song Fan, Han-Qing Zhang, Qun-Xing Li, Tian Tian, Wei-Xiong Chen, Guo-Kai Pan, Michael Ho-Young Ahn, Sheng Sun, Bing-Hao Wu, Jin-Song Li
BACKGROUND: Harvesting an optimally thinned anterolateral thigh flaps (ALTFs) is a challenge in overweight individuals and in the Western population. Here, we describe a novel honeycomb technique to achieve a superthin ALTF in overweight patients. METHODS: Forty patients with a body mass index(BMI) >25 kg/m who required a thinned ALTF for reconstruction were randomly assigned to a honeycomb technique (HCT) group or a microdissection technique (MDT) group. Patients in the HCT group received cavitron ultrasonic surgical aspiration (CUSA) to thin the flaps, and flap thinning was performed with a conventional MDT in the MDT group...
May 2, 2018: Plastic and Reconstructive Surgery
Amit Agarwal, Miriam S Vitiello, Leonardo Viti, Anna Cupolillo, Antonio Politano
Herein, we explore the main features and the prospect of plasmonics with two-dimensional semiconductors. Plasmonic modes in each class of van der Waals semiconductors have their own peculiarities, along with potential technological capabilities. Plasmons of transition-metal dichalcogenides share features typical of graphene, due to their honeycomb structure, but with damping processes dominated by intraband rather than interband transitions, unlike graphene. Spin-orbit coupling strongly affects the plasmonic spectrum of buckled honeycomb lattices (silicene and germanene), while the anisotropic lattice of phosphorene determines different propagation of plasmons along the armchair and zigzag directions...
May 9, 2018: Nanoscale
Xing-Kai Hu, Ji-Kai Lyu, Chang-Wen Zhang, Pei-Ji Wang, Wei-Xiao Ji, Ping Li
A large bulk band gap is critical for the application of two-dimensional topological insulators (TIs) in spintronic devices operating at room temperature. On the basis of first-principles calculations, we predict BiXH (X = OH, SH) monolayers as TIs with an extraordinarily large bulk gap of 820 meV for BiOH and 850 meV for BiSH, and propose a tight-binding model considering spin-orbit coupling to describe the electronic properties of BiXH. These large gaps are entirely due to the strong spin-orbit interaction related to the pxy orbitals of the Bi atoms of the honeycomb lattice...
May 8, 2018: Physical Chemistry Chemical Physics: PCCP
Yuree Lee, Taek Han Yoon, Jiyoun Lee, So Yeon Jeon, Jae Ho Lee, Mi Kyoung Lee, Huize Chen, Ju Yun, Se Yun Oh, Xiaohong Wen, Hui Kyung Cho, Hyunggon Mang, June M Kwak
The cell wall, a defining feature of plants, provides a rigid structure critical for bonding cells together. To overcome this physical constraint, plants must process cell wall linkages during growth and development. However, little is known about the mechanism guiding cell-cell detachment and cell wall remodeling. Here, we identify two neighboring cell types in Arabidopsis that coordinate their activities to control cell wall processing, thereby ensuring precise abscission to discard organs. One cell type produces a honeycomb structure of lignin, which acts as a mechanical "brace" to localize cell wall breakdown and spatially limit abscising cells...
April 24, 2018: Cell
Michael K Lin, Jin Yang, Chun Wei Hsu, Anuradha Gore, Alexander G Bassuk, Lewis M Brown, Ryan Colligan, Jesse D Sengillo, Vinit B Mahajan, Stephen H Tsang
High-temperature requirement protein A1 (HTRA1) is a serine protease secreted by a number of tissues including retinal pigment epithelium (RPE). A promoter variant of the gene encoding HTRA1 is part of a mutant allele that causes increased HTRA1 expression and contributed to age-related macular degeneration (AMD) in genomewide association studies. AMD is characterized by pathological development of drusen, extracellular deposits of proteins and lipids on the basal side of RPE. The molecular pathogenesis of AMD is not well understood, and understanding dysregulation of the extracellular matrix may be key...
May 5, 2018: Aging Cell
Debopam Datta, Michael A Stroscio, Mitra Dutta, Weidong Zhang, Elliott R Brown
This theoretical effort is the first to explore the possible hypothesis that terahertz optical activity of Bacillus spores arises from normal vibrational modes of spore coat subcomponents in the terahertz frequency range. Bacterial strains like Bacillus and Clostridium form spores with a hardened coating made of peptidoglycan to protect its genetic material in harsh conditions. In recent years, electron microscopy and atomic force microscopy has revealed that bacterial spore surfaces are decorated with nanocylinders and honeycomb nanostructures...
May 3, 2018: Journal of Biophotonics
Yuichiro Okumura, Takehiro Noda, Hidetoshi Eguchi, Yoshifumi Iwagami, Daisaku Yamada, Tadafumi Asaoka, Koichi Kawamoto, Kunihito Gotoh, Shogo Kobayashi, Koji Umeshita, Yasuji Hashimoto, Yutaka Takeda, Masahiro Tanemura, Minoru Shigekawa, Eiichi Morii, Tetsuo Takehara, Masaki Mori, Yuichiro Doki
Solid serous cystadenoma of the pancreas is the rarest subtype of serous cystadenoma. Cystic structures are difficult to recognize by imaging studies. In the clinical setting, it is crucial to discriminate a solid serious cystadenoma from other solid pancreatic tumors. The present study reported a case of solid serous cystadenoma in which the magnetic resonance cholangiopancreatography (MRCP) findings were useful for diagnosis and decision-making regarding the surgical strategy, with a review of the previous reports of solid serous cystadenoma...
May 2018: Molecular and Clinical Oncology
Wenxin Huang, Jun Li, Yunhe Xu
Porous MnO₂ was uniformly electrodeposited on nickel foam in MnSO₄ solution, which was applied as the electrode of supercapacitors. The nucleation/growth mechanisms of porous MnO₂ were investigated firstly. Then two kinds of electrochemical measuring technologies, corresponding to the cycle voltammetry (CV) and galvanostatic charge-discharge, were adopted to assess the electrochemical performance of MnO₂ electrodes. The results demonstrated that the deposition of MnO₂ on nickel foam included four stages...
May 2, 2018: Materials
Artur Glavic, Brock Summers, Ashutosh Dahal, Joseph Kline, Walter Van Herck, Alexander Sukhov, Arthur Ernst, Deepak K Singh
The nature of magnetic correlation at low temperature in two-dimensional artificial magnetic honeycomb lattice is a strongly debated issue. While theoretical researches suggest that the system will develop a novel zero entropy spin solid state as T → 0 K, a confirmation to this effect in artificial honeycomb lattice of connected elements is lacking. This study reports on the investigation of magnetic correlation in newly designed artificial permalloy honeycomb lattice of ultrasmall elements, with a typical length of ≈12 nm, using neutron scattering measurements and temperature-dependent micromagnetic simulations...
April 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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