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Jiangwei Wang, Yanming Wang, Wei Cai, Jixue Li, Ze Zhang, Scott X Mao
Shear band in metallic crystals is localized deformation with high dislocation density, which is often observed in nanopillar deformation experiments. The shear band dynamics coupled with dislocation activities, however, remains unclear. Here, we investigate the dynamic processes of dislocation and shear band in body-centered cubic (BCC) tungsten nanowires via an integrated approach of in situ nanomechanical testing and atomistic simulation. We find a strong effect of surface orientation on dislocation nucleation in tungsten nanowires, in which {111} surfaces act as favorite sites under high strain...
March 15, 2018: Scientific Reports
Qinyu Qian, Ying Yan, Chinhua Wang
We report on a monolithic, all-metallic, and flexible metasurface perfect absorber [black nickel (Ni)] based on coupled Mie resonances originated from vertically stepped Ni nanopillars homoepitaxially grown on an Ni substrate. Coupled Mie resonances are generated from Ni nanopillars with different sizes such that Mie resonances of the stepped two sets of Ni nanopillars occur complementarily at different wavelengths to realize polarization-independent broadband absorption over the entire visible wavelength band (400-760 nm) within an ultra-thin surface layer of only 162 nm thick in total...
March 15, 2018: Optics Letters
Shan Zhang, Baojin Ma, Feng Liu, Jiazhi Duan, Shicai Wang, Jichuan Qiu, Dong Li, Yuanhua Sang, Chao Liu, Duo Liu, Hong Liu
Numerous studies have determined that physical cues, especially the nanotopography of materials, play key roles in directing stem cell differentiation. However, most research on nanoarrays for stem cell fate regulation are based on non-biodegradable materials, such as silicon wafers, TiO2, and poly (methyl methacrylate), which are rarely used as tissue engineering biomaterials. In this study, we prepared biodegradable poly-lactic acid (PLA) nanopillar arrays with different diameters but the same center-to-center distance using a series of anodic aluminum oxide nano-well arrays as templates...
March 8, 2018: Nano Letters
Aizhen Liao, Huichao He, Lanqin Tang, Yichang Li, Jiyuan Zhang, Jiani Chen, Lan Chen, Chunfeng Zhang, Yong Zhou, Zhigang Zou
A facile rapid dehydration strategy (RD) is explored for quasi-topotactic transformation of FeOOH nanorods to robust Fe2O3 porous nanopillars, avoiding collapse, shrink, and coalescence, compared with a conventional treatment route. Additionally, the so-called RD process is capable of generating beneficial porous structure for PEC water oxidation. The obtained RD-Fe2O3 photoanode exhibits a photocurrent density as high as 2.0 mA cm-2 at 1.23 V vs. RHE, and a saturated photocurrent density of 3.5 mA cm-2 at 1...
March 2, 2018: ACS Applied Materials & Interfaces
Guohua Dong, Ziyao Zhou, Mengmeng Guan, Xu Xue, Mingfeng Chen, Jing Ma, Zhongqiang Hu, Wei Ren, Zuo-Guang Ye, Ce-Wen Nan, Ming Liu
Traditional magnetostrictive/piezoelectric laminated composites rely on the two-dimensional interface that transfers stress/strain to achieve the large magnetoelectric (ME) coupling, nevertheless, they suffer from the theoretical limitation of the strain effect and of the substrate clamping effect in real ME applications. In this work, 3D NZFO/BTO-pillar nanocomposite films were grown on SrTiO3 by template-assisted pulsed laser deposition, where BaTiO3 (BTO) nanopillars appeared in an array with distinct phase transitions as the cores were covered by NiZn ferrite (NZFO) layer...
March 7, 2018: ACS Nano
Songmei Wu, Flavia Zuber, Katharina Maniura-Weber, Juergen Brugger, Qun Ren
BACKGROUND: Due to the increased emergence of antimicrobial resistance, alternatives to minimize the usage of antibiotics become attractive solutions. Biophysical manipulation of material surface topography to prevent bacterial adhesion is one promising approach. To this end, it is essential to understand the relationship between surface topographical features and bactericidal properties in order to develop antibacterial surfaces. RESULTS: In this work a systematic study of topographical effects on bactericidal activity of nanostructured surfaces is presented...
February 28, 2018: Journal of Nanobiotechnology
Shuli Wang, Yongshun Liu, Peng Ge, Qiqi Kan, Nianzuo Yu, Jing Wang, Jingjie Nan, Shunsheng Ye, Junhu Zhang, Weiqing Xu, Bai Yang
This article shows a new strategy for the fabrication of nanofluidics based on nanoscale gaps in nanopillar arrays. Silicon nanopillar arrays are prepared in a designed position by combining conventional photolithography with colloidal lithography. The nanogaps between the pillars are used as nanochannels for the connection of two polydimethylsiloxane-based microchannels in microfluidics. The gap between neighbouring nanopillars can be accurately controlled by changing the size of initial colloidal spheres and by an etching process, which further determines the dimensions of the nanochannels...
February 27, 2018: Lab on a Chip
Shuang Shuang, Zhengjun Zhang
The wide band gap of TiO₂ hinders the utilization of visible light in high-performance photocatalysis. Herein, vertically aligned Ti nanopillar arrays (NPAs) were grown by the glancing angle deposition method (GLAD) and then thermally oxidized into TiO₂ NPAs. The metallic nanoparticles (NPs) were fabricated by successive ion layer adsorption and reaction (SILAR) method. And we covered ultrathin TiO₂ layer on Au/Pt NPs decorated NPA using atomic layer deposition (ALD) method and did annealing process in the end...
February 9, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Wei Li, Chao Ding, Yun Cai, Juyan Liu, Linlin Wang, Qingying Ren, Jie Xu
The sensitivity of silicon nanopillar array for relative humidity (RH) with UV illumination was investigated in this work. The silicon nanopillar array was prepared by nanosphere lithography. Electrical measurements were performed on its sensing performance with and without UV irradiation. It was found that UV light improved the humidity sensitivity with different UV light wavelengths and power. The sensor response and recovery time were reduced. Furthermore, the turn-on threshold voltage and the operating voltage both decreased...
February 23, 2018: Sensors
Andrés C Galera, Verónica San Miguel, Juan Baselga
Magneto-mechanically active surfaces (MMAS) represent a new family of nano/micro-structured surfaces in which motion is induced by an external magnetic field. Under the name of "artificial cilia", "biomimetic cilia", "magnetic actuated patterns", "nanopillars", etc., published works in this area continue their quick growth in number. Notwithstanding their potential application in microfluidic, chemical sensors, catalytic processes and microelectronics to increase device perfomances, there is still a lot to do in the development of these materials...
February 23, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Guangshun Yi, Yuan Yuan, Xiukai Li, Yugen Zhang
ZnO nanopillars coated on various surfaces are able to kill adhered bacteria and fungi due to their physical structure through a rupturing mechanism. Remarkably, zinc foil and galvanized steel surfaces with ZnO nanopillar coatings demonstrate an excellent remote bacteria-killing property. Their bacterial killing efficacy is several orders higher than ZnO nanopillars coated on other surfaces as well as ZnO nanoparticles themselves. Mechanistic study shows that the nanostructure surface kills adhered microbial cells by rupturing the cell wall, while superoxide (• O2 - ) released from the ZnO coating with electrons donated from zinc via the Zn/ZnO interface rather than photoirritation is responsible for the superior remote killing...
February 22, 2018: Small
Changkun Liu, Qiang Li, Xia Wang, Jie Xu, Shandong Li
One-dimensional (1D) Co3O4 nanopillars were prepared by a facile hydrothermal-calcination method, which involved low thermal decomposition of Co(OH)y(CO3)0.5(2-y) · 11H2O at different temperatures. Microstructure, lithium-storage performance and the conductivity of the Co3O4 nanopillars calcined at different temperatures were systematically investigated. It was revealed that the calcined temperature has an effect on the particle size, crystallinity, and morphology of the Co3O4 nanopillars, which further influenced its electrochemical performance...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Mengxing Wang, Wenlong Cai, Kaihua Cao, Jiaqi Zhou, Jerzy Wrona, Shouzhong Peng, Huaiwen Yang, Jiaqi Wei, Wang Kang, Youguang Zhang, Jürgen Langer, Berthold Ocker, Albert Fert, Weisheng Zhao
Perpendicular magnetic tunnel junctions based on MgO/CoFeB structures are of particular interest for magnetic random-access memories because of their excellent thermal stability, scaling potential, and power dissipation. However, the major challenge of current-induced switching in the nanopillars with both a large tunnel magnetoresistance ratio and a low junction resistance is still to be met. Here, we report spin transfer torque switching in nano-scale perpendicular magnetic tunnel junctions with a magnetoresistance ratio up to 249% and a resistance area product as low as 7...
February 14, 2018: Nature Communications
Andreea Belu, Mehmet Yilmaz, Elmar Neumann, Andreas Offenhäusser, Gokhan Demirel, Dirk Mayer
Three dimensional, nanostructured surfaces have attracted considerable attention in biomedical research since they have proven to represent a powerful platform to influence cell fate. In particular, nanorods and nanopillars possess great potential for the control of cell adhesion and differentiation, gene and biomolecule delivery, optical and electrical stimulation and recording, as well as cell patterning. Here, we investigate the influence of asymmetric poly(dichloro-p-xylene) (PPX) columnar films on the adhesion and maturation of cortical neurons...
February 10, 2018: Journal of Biomedical Materials Research. Part A
Juhui Ko, Sung-Gyu Park, Sangyeop Lee, Xiaokun Wang, ChaeWon Mun, Sunho Kim, Dong-Ho Kim, Jaebum Choo
We utilized a fast Raman spectral mapping technique for fast detection of bacterial pathogens. Three-dimensional (3D) plasmonic nanopillar arrays were fabricated using the nanolithography-free process consisting of maskless Ar plasma treatment of a polyethylene terephthalate (PET) substrate and subsequent metal deposition. Bacterial pathogens were immobilized on the positively charged poly(L-lysine) (PLL)-coated 3D plasmonic substrate through electrostatic interactions. Then the bacterial surfaces were selectively labeled with antibody-conjugated surface-enhanced Raman scattering (SERS) nanotags, and Raman mapping images were collected and statistically analyzed for quantitative analysis of bacteria...
February 6, 2018: ACS Applied Materials & Interfaces
Jau-Ye Shiu, Lina Aires, Zhe Lin, Viola Vogel
A robust nanopillar platform with increased spatial resolution reveals that perinuclear forces, originating from stress fibres spanning the nucleus of fibroblasts, are significantly higher on these nanostructured substrates than the forces acting on peripheral adhesions. Many perinuclear adhesions embrace several nanopillars at once, pulling them into β1-integrin- and zyxin-rich clusters, which are able to translocate in the direction of cell motion without losing their tensile strength. The high perinuclear forces are greatly reduced upon inhibition of cell contractility or actin polymerization and disruption of the actin cap by KASH dominant-negative mutant expression...
February 5, 2018: Nature Cell Biology
Hong Wang, Zihang Huo, Zihao Zhang, Shaofei Chen, Shaoji Jiang
A computer-automated design process for a surface-enhanced Raman scattering (SERS) substrate using a particle swarm optimization algorithm is proposed. Nanostructured Ag coated hydrogen silsesquioxane nanopillar arrays of various sizes for SERS substrate applications are fabricated by direct Ag film deposition on substrates patterned by electron beam lithography and are investigated systematically. Good agreement is demonstrated between experimental and simulation results. The absorption spectra, charge distributions, and electric field distributions are calculated using finite-difference time-domain simulations to explain the field enhancement mechanism and indicate that this enhancement originates from plasmon resonance...
January 22, 2018: Optics Express
Dandan Men, Yingyi Wu, Chu Wang, Junhuai Xiang, Ganlan Yang, Changjun Wan, Honghua Zhang
Two-dimensional (2D) periodic micro/nanostructured arrays as SERS substrates have attracted intense attention due to their excellent uniformity and good stability. In this work, periodic hierarchical SiO₂ nanopillar arrays decorated with Ag nanoparticles (NPs) with clean surface were prepared on a wafer-scale using monolayer Au NP arrays as masks, followed by reactive ion etching (RIE), depositing Ag layer and annealing. For the prepared SiO₂ nanopillar arrays decorated with Ag NPs, the size of Ag NPs was tuned from ca...
February 4, 2018: Materials
Brandon Demory, Kunook Chung, Adam Katcher, Jingyang Sui, Hui Deng, Pei-Cheng Ku
A parabolic nanolens array coupled to the emission of a nanopillar micro-light emitting diode (LED) color pixel is shown to reduce the far field divergence. For a blue wavelength LED, the total emission is 95% collimated within a 0.5 numerical aperture (NA) zone, a 3.5x improvement over the same LED without a lens structure. This corresponds to a have width half maximum (HWHM) linewidth reduction of 2.85 times. Using a resist reflow and etchback procedure, the nanolens array dimensions and parabolic shape are formed...
February 1, 2018: Nanotechnology
Xiao Tang, Ravindranath Viswan, Min Gao, Chung Ming Leung, Carlos Folger, Haosu Luo, Brandon Howe, Jiefang Li, Dwight Viehland
We have deposited self-assembled BiFeO3-CoFe2O4 (BFO-CFO) thin films on (100)-oriented SrRuO3-buffered Pb(Mg1/3Nb2/3)0.62Ti0.38O3 (PMN-38PT) single crystal substrates. These heterostructures were used for the study of real-time changes in the magnetization with applied DC electric field (E DC ). With increasing E DC , a giant magnetization change was observed along the out-of-plane (easy) axis. The induced magnetization changes of the CFO nanopillars in the BFO/CFO layer were about ΔM/M rDC  = 93% at E DC  = -3 kv/cm...
January 26, 2018: Scientific Reports
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