Probing the chaotic boundary of a membrane resonator with nanowire arrays

Nanoscale ◽  
2017 ◽  
Vol 9 (44) ◽  
pp. 17524-17532 ◽  
Author(s):  
Tanju Yildirim ◽  
Kiho Cho ◽  
Xiaoyu Wu ◽  
Yuerui Lu
Keyword(s):  
Nanowire Arrays ◽  
Electromechanical Systems ◽  
Chaotic Phenomena ◽  
Potential Applications ◽  
Different Characteristics

Mechanically induced nonlinearities in nano-electromechanical systems (NEMSs) are typically avoided in design due to their unpredictable nature; however, by incorporating these normally unwanted nonlinear and chaotic phenomena, the performance of NEMS devices displays substantially different characteristics opening a broad new range of potential applications for their use.

The Light Absorption Properties of Cu2S Nanowire Arrays

2012 ◽  
Vol 528 ◽  
pp. 272-276 ◽  
Author(s):  
Shan Ren ◽  
Li Qiang Li ◽  
Zhu Feng Liu ◽  
Ming Li ◽  
Lan Hong
Keyword(s):  
Optical Properties ◽  
Distribution Density ◽  
Photovoltaic Cell ◽  
Nanowire Arrays ◽  
Band Gaps ◽  
Infrared Light ◽  
Infrared Band ◽  
Absorption Properties ◽  
Potential Applications ◽  
Cu Foil

Cu2S nanowire arrays with different morphologies were prepared by solid-gas reaction between Cu foil and mixture gas of H2S and O2. Their microstructures were observed with XRD, TEM, and the optical properties were measured by DRS, PL and Raman. The results showed that the nanowire were Cu2S single crystal with a thin layer CuxO (x=1, 2) over the surface. The optical properties of the Cu2S nanowire arrays are related to the diameter, length, and distribution density of nanowire arrays. The thinner is the nanowire’s diameter; the bigger is the absorption of the visible light, and the absorbance begun to descend within infrared band. The absorbance of nanowire arrays with bigger diameter to the infrared light was stronger than that with thinner diameter. The photoluminescence spectrum (PL) indicated that band gaps of Cu2S nanowire arrays also changed simultaneously with the nanowire arrays’ structure parameters. The research demonstrated the Cu2S nanowire arrays’ potential applications in the photovoltaic cell and solar-heat harvesting area.

scholarly journals Universal predictability of mobility patterns in cities

2014 ◽  
Vol 11 (100) ◽  
pp. 20140834 ◽  
Author(s):  
Xiao-Yong Yan ◽  
Chen Zhao ◽  
Ying Fan ◽  
Zengru Di ◽  
Wen-Xu Wang
Keyword(s):  
Spatial Scales ◽  
Human Mobility ◽  
Mobility Patterns ◽  
Mobility Data ◽  
Universal Prediction ◽  
Potential Applications ◽  
Mobility Behaviour ◽  
History Of ◽  
Different Characteristics ◽  
The City

Despite the long history of modelling human mobility, we continue to lack a highly accurate approach with low data requirements for predicting mobility patterns in cities. Here, we present a population-weighted opportunities model without any adjustable parameters to capture the underlying driving force accounting for human mobility patterns at the city scale. We use various mobility data collected from a number of cities with different characteristics to demonstrate the predictive power of our model. We find that insofar as the spatial distribution of population is available, our model offers universal prediction of mobility patterns in good agreement with real observations, including distance distribution, destination travel constraints and flux. By contrast, the models that succeed in modelling mobility patterns in countries are not applicable in cities, which suggests that there is a diversity of human mobility at different spatial scales. Our model has potential applications in many fields relevant to mobility behaviour in cities, without relying on previous mobility measurements.

scholarly journals Perpendicular Giant Magnetoresistance and Magnetic Properties of Co/Cu Nanowire Arrays Affected by Period Number and Copper Layer Thickness

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Juan Han ◽  
Xiufang Qin ◽  
Zhiyong Quan ◽  
Lanfang Wang ◽  
Xiaohong Xu
Keyword(s):  
Electron Microscopy ◽  
Layer Thickness ◽  
Giant Magnetoresistance ◽  
Average Diameter ◽  
Oscillatory Behavior ◽  
Nanowire Arrays ◽  
Magnetic Nanowires ◽  
Experimental Conditions ◽  
Remanence Ratio ◽  
Potential Applications

One-dimensional magnetic nanowires have attracted much attention in the last decades due to their unique physical properties and potential applications in magnetic recording and spintronics. In this work, ordered arrays of Co/Cu multilayered nanowires which can be exploited to develop magnetoresistive sensors were successfully prepared using porous anodic alumina (PAA) templates. The structure and morphology of the multilayered nanowire arrays were characterized by transmission electron microscopy and scanning electron microscopy. The nanowire arrays are highly ordered and the average diameter is about 50 nm, which is controlled by the pore diameter of the PAA templates. The influences of period number and Cu layer thickness on the magnetic and the giant magnetoresistance (GMR) properties were investigated. The coercivity and remanence ratio increase first and then gradually tend to be stable with the increase of period number and the Cu layer thickness, while the GMR ratio increases first and then decreases with the increase of the period number accompanied by an oscillatory behavior of GMR as the Cu layer thickness changes, which are ascribed to the spin dependence electron scattering in the multilayers. The optimum GMR of −13% appears at Co (50 nm)/Cu (5 nm) with 200 deposition cycles in our experimental conditions.

Growth and characterization of type II ZnO/ZnSe core/shell nanowire arrays

2010 ◽  
Vol 25 (7) ◽  
pp. 1272-1277 ◽  
Author(s):  
Jinjian Zheng ◽  
Zhiming Wu ◽  
Weihuang Yang ◽  
Shuping Li ◽  
Junyong Kang
Keyword(s):  
Electron Microscopy ◽  
Chemical Vapor ◽  
Band Alignment ◽  
Nanowire Arrays ◽  
Core Shell ◽  
Type Ii ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Potential Applications

Type II ZnO/ZnSe core/shell nanowire arrays were grown by a two-step chemical vapor deposition. The nanowire arrays with dense nanoislands on the surface are well aligned and normal to the substrate imaged by scanning electron microscopy. The core/shell structure of nanowires was identified by a high-resolution transmission electron microscopy. The structure and composition of the shell were confirmed to be wurtzite ZnSe by x-ray diffraction, Raman scattering and energy-dispersive x-ray spectroscopy. Moreover, an intense emission was observed at 1.89 eV smaller than the band gaps of core and shell materials by photoluminescence, indicating the achievement of the type II band alignment at the interface. This study is expected to contribute to the potential applications in novel photovoltaic devices.

Morphological and Magnetic Properties of Electrodeposited Ni-Ag Alloy Nanowire Arrays in Modified AAO Template

2014 ◽  
Vol 875-877 ◽  
pp. 14-17 ◽  
Author(s):  
Wei Zheng Shang ◽  
Wei Guo Zhang ◽  
Hong Zhi Wang
Keyword(s):  
Electron Microscopy ◽  
Anodic Aluminum Oxide ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Atomic Ratio ◽  
Nanowire Arrays ◽  
Aao Template ◽  
Anodic Aluminum ◽  
Transmission Electron ◽  
Potential Applications

Highly ordered Ni-Ag alloy nanowire arrays have been fabricated successfully by electrodeposition into the pores of anodic aluminum oxide (AAO). This template was prepared with modified two-step anodizing method. The scanning and transmission electron microscopy were utilized to characterize the Ni-Ag alloy nanowire arrays. The results revealed that the nanowire arrays were regularly arranged, about 90nm in diameter and 30µm in length. The nanowires were single crystal and the atomic ratio of Ni and Ag is very close to 79:21. Magnetic hysteresis loop showed that Ni-Ag alloy nanowire arrays embedded in AAO have superparamagnetism, indicating their potential applications in biomedical materials.

scholarly journals Orientation Growth and Magnetic Properties of Electrochemical Deposited Nickel Nanowire Arrays

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 152 ◽  
Author(s):  
Yanlong Yu ◽  
Jinpeng Li ◽  
Jun Wang ◽  
Xige Wu ◽  
Cuiyan Yu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Growth Direction ◽  
Anodic Aluminum Oxide Template ◽  
Nanowire Arrays ◽  
Confined Space ◽  
Spintronic Devices ◽  
Potential Applications ◽  
Parallel Direction ◽  
Nickel Nanowire ◽  
Preparation Strategy

Highly ordered ferromagnetic metal nanowire arrays with preferred growth direction show potential applications in electronic and spintronic devices. In this work, by employing a porous anodic aluminum oxide template-assisted electrodeposition method, we successfully prepared Ni nanowire arrays. Importantly, the growth direction of Ni nanowire arrays can be controlled by varying the current densities. The crystalline and growth orientation of Ni nanowire arrays show effects on magnetic properties. Single-crystallinity Ni nanowires with [110] orientation show the best magnetic properties, including coercivity and squareness, along the parallel direction of the nanowire axis. The current preparation strategy can be used to obtain other nanowire arrays (such as metal, alloy, and semiconductor) with controlled growth direction in confined space, and is therefore of broad interest for different applications.

Hexagonal-arranged ZnO Nanowire Arrays by Using Au Nanohole Membranes as Fabrication Template

2004 ◽  
Vol 849 ◽  
Author(s):  
H. J. Fan ◽  
W. Lee ◽  
K. Nielsch ◽  
M. Zacharias ◽  
A. Dadgar ◽  
...  
Keyword(s):  
Large Scale ◽  
Porous Alumina ◽  
Gold Catalyst ◽  
Sensor Arrays ◽  
Zno Nanowires ◽  
Nanowire Arrays ◽  
Guided Growth ◽  
Potential Applications ◽  
Vertically Aligned ◽  
Ordered Porous

ABSTRACTA new template method for large-scale fabrication of hexagonally patterned and vertically aligned ZnO nanowires is demonstrated. The process involves a novel type of metal membrane, a gold catalyst template produced using the membrane as deposition mask, and the catalyst-guided growth of ZnO nanowires. The metal membranes, composed of hexagonal nanohole arrays, are electrochemically replicated from ordered porous alumina. The ZnO nanowires obtained have a uniform alignment perpendicular to the GaN surface and a distribution according to the pattern defined by the nanohole membrane. Such periodically arranged ZnO nanowires have potential applications as sensor arrays and piezoelectric transducers.

scholarly journals Direct Writing Corrugated PVC Gel Artificial Muscle via Multi-Material Printing Processes

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2734
Author(s):  
Bin Luo ◽  
Yiding Zhong ◽  
Hualing Chen ◽  
Zicai Zhu ◽  
Yanjie Wang
Keyword(s):  
Structural Parameters ◽  
Artificial Muscle ◽  
Core Layer ◽  
Direct Writing ◽  
Curing Conditions ◽  
Potential Applications ◽  
Manufacturing Methods ◽  
Traditional Manufacturing ◽  
Printing Processes ◽  
Different Characteristics

Electroactive PVC gel is a new artificial muscle material with good performance that can mimic the movement of biological muscle in an electric field. However, traditional manufacturing methods, such as casting, prevent the broad application of this promising material because they cannot achieve the integration of the PVC gel electrode and core layer, and at the same time, it is difficult to create complex and diverse structures. In this study, a multi-material, integrated direct writing method is proposed to fabricate corrugated PVC gel artificial muscle. Inks with suitable rheological properties were developed for printing four functional layers, including core layers, electrode layers, sacrificial layers, and insulating layers, with different characteristics. The curing conditions of the printed CNT/SMP inks under different applied conditions were also discussed. The structural parameters were optimized to improve the actuating performance of the PVC gel artificial muscle. The corrugated PVC gel with a span of 1.6 mm had the best actuating performance. Finally, we printed three layers of corrugated PVC gel artificial muscle with good actuating performance. The proposed method can help to solve the inherent shortcomings of traditional manufacturing methods of PVC gel actuators. The printed structures have potential applications in many fields, such as soft robotics and flexible electronic devices.

Investigation of Temperature-Dependent Droplet Formation of Nanofluids in Microfluidic T-Junction

2008 ◽  
Author(s):  
Nam-Trung Nguyen ◽  
S. M. Sohel Murshed ◽  
Say-Hwa Tan
Keyword(s):  
Droplet Size ◽  
Formation Process ◽  
Size Control ◽  
Droplet Formation ◽  
Deionized Water ◽  
Experimental Investigations ◽  
Temperature Dependent ◽  
Potential Applications ◽  
Increasing Temperature ◽  
Different Characteristics

The study on the control of microdroplet formation and manipulation is very important due to the potential applications of droplet-based microfluidics in various important fields. Experimental investigations on thermally controlled droplet formation and size manipulation of deionized water and nanofluids in a microfluidic T-junction are reported in this paper. The heater temperature affects the droplet formation process. Nanofluids are found to exhibit different characteristics in droplet formation and size control with the temperature. Addition of spherical-shaped TiO2 (15 nm) nanoparticles in deionized water results in much smaller droplet size compared to the cylindrical-shaped TiO2 (10×40) nm) nanoparticles. Other than nanofluid with cylindrical-shaped nanoparticles, the droplet size was found to increase with increasing temperature.

FABRICATION AND MAGNETIC CHARACTERIZATION OF Au/Ni MULTILAYER NANOWIRE ARRAYS

2006 ◽  
Vol 05 (02n03) ◽  
pp. 183-187 ◽  
Author(s):  
FANG XU ◽  
KAI JIANG ◽  
HAOLING SUN ◽  
SONG GAO ◽  
DONGSHENG XU
Keyword(s):  
Easy Axis ◽  
Deposition Time ◽  
Structural Parameters ◽  
Magnetic Measurement ◽  
Perpendicular Magnetic Anisotropy ◽  
Nanowire Arrays ◽  
Anodic Aluminum ◽  
Measurement Results ◽  
Potential Applications

Ordered Au/Ni multilayer nanowire arrays have been fabricated into the pores of anodic aluminum oxide (AAO) templates by pulse DC electrodeposition. Structural parameters, such as nanowire length and layer thickness can be controlled by changing the deposition time and the pulse width. The magnetic measurement results indicate that these Au/Ni multilayer nanowire arrays have small coercivity and perpendicular magnetic anisotropy, which the easy axis is parallel to the nanowires. These Au/Ni multilayer structures are expected to be found potential applications in AC inductors or magnetic shielding.

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