Hybrid MnO2/C nano-composites on a macroporous electrically conductive network for supercapacitor electrodes

2015 ◽  
Vol 3 (32) ◽  
pp. 16695-16707 ◽  
Author(s):  
Dajun Wu ◽  
Shaohui Xu ◽  
Mai Li ◽  
Chi Zhang ◽  
Yiping Zhu ◽  
...  
Keyword(s):  
Negative Electrode ◽  
Nano Composites ◽  
Conductive Network ◽  
Electrically Conductive ◽  
Blue Led ◽  
Hybrid Device ◽  
In Series

Hybrid MnO2/C nano-composites are formed on a macroporous electrically conductive network as a negative electrode. Three devices packaged in CR2032 batteries in series can power a blue LED for about 100 minutes after charging each hybrid device for 30 s.

scholarly journals Microfluidic Optical Shutter Flexibly x-y Actuated via Electrowetting-on-Dielectrics with <20 ms Response Time

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Henning Fouckhardt ◽  
Johannes Strassner ◽  
Carina Heisel ◽  
Dominic Palm ◽  
Christoph Doering
Keyword(s):  
Optical Properties ◽  
Response Time ◽  
Visible Spectral Range ◽  
Contact Structures ◽  
Light Path ◽  
Cell Type ◽  
Electrically Conductive ◽  
Droplet Movement ◽  
In Series ◽  
Optical Shutter

Tunable microoptics deals with devices of which the optical properties can be changed during operation without mechanically moving solid parts. Often a droplet is actuated instead, and thus tunable microoptics is closely related to microfluidics. One such device/module/cell type is an optical shutter, which is moved in or out of the path of the light. In our case the transmitting part comprises a moving transparent and electrically conductive water droplet, embedded in a nonconductive blackened oil, that is, an opaque emulsion with attenuation of 30 dB at 570 nm wavelength over the 250 μm long light path inside the fluid (15 dB averaged over the visible spectral range). The insertion loss of the cell is 1.5 dB in the “open shutter” state. The actuation is achieved via electrowetting-on-dielectrics (EWOD) with rectangular AC voltage pulses of 2·90 V peak-to-peak at 1 kHz. To flexibly allow for horizontal, vertical, and diagonal droplet movement in the upright x-y plane, the contact structures are prepared such that four possible stationary droplet positions exist. The cell is configured as two capacitors in series (along the z axis), such that EWOD forces act symmetrically in the front and back of the 60 nl droplet with a response time of <20 ms.

Heterogeneous Preparation of Cellulose/Ag/Polyaniline Conductive Composite and its Electrical Property

2012 ◽  
Vol 182-183 ◽  
pp. 254-258
Author(s):  
Zhong Li Zhao ◽  
Zun Li Mo ◽  
Zhong Yu Chen
Keyword(s):  
Electrical Conductivity ◽  
Electrical Property ◽  
Conductive Network ◽  
High Electrical Conductivity ◽  
Electrically Conductive ◽  
Conductive Composite

Cellulose/Ag/polyaniline conductive composite with rather excellent electrical conductivity was heterogeneously synthesized in this paper. The UV-Vis analysis indicated that homogeneous nanoAg particles deposited on the surface of cellulose in the form of globe particles. They offered some electrons to polyaniline chains. This behavior resulted to the facts that more polyaniline embedded on cellulose and an integrated electrically conductive network formed. Consequently, the high electrical conductivity of the composite was observed. The value was 3.48 S/cm, which was higher two magnitudes than the electrical conductivity of cellulose/polyaniline composite (2.15×10-2S/cm), and even was higher than the electrical conductivity of pure polyaniline (0.142 S/cm). This paper provided a facile method for the preparation of cellulose/Ag/ polyaniline composite with favorable electrical conductivity.

scholarly journals Effect of curing age on the self-sensing behavior of carbon-based engineered cementitious composites (ECC) under monotonic flexural loading scenario

2018 ◽  
Vol 162 ◽  
pp. 01034
Author(s):  
Ali Majeed Al-Dahawi
Keyword(s):  
Carbon Fibers ◽  
The Self ◽  
Cementitious Composites ◽  
Conductive Network ◽  
Engineered Cementitious Composites ◽  
Electrically Conductive ◽  
Conductive Material ◽  
Flexural Loading ◽  
Curing Age ◽  
Carbon Based

The potential effects of curing age on the self-sensing (piezoresistivity) capability of carbon-based Engineered Cementitious Composites (ECC) specimens are under focus in the present study. This non-structural feature can be regarded as one of the best solutions for continuously monitoring of infrastructures in terms of damage and deformations. Carbon fibers which are a micro-scale electrically conductive material were added to the ECC matrix and well dispersed to create the electrically conductive network. This network is responsible for sensing the applied loads on the prismatic specimens. The self-sensing behavior of electrically conductive prismatic specimens under four-point monotonic flexural loading was investigated and compared with dielectric ECC specimens at four ages of curing (7, 28, 90 and 180 days). The results showed that the developed multifunctional cementitious composites can sense the changes in the applied flexural stresses and the resultant mid-span deflection along the adopted curing ages with an improvement in the later ages.

scholarly journals Velocity Distribution Characteristics Of Sea Water In Conductiv Magnetohydrodynamic (MHD) Homopolar Ducts

2015 ◽  
Vol 21 (3) ◽  
pp. 679-687
Author(s):  
Vasile Dobref ◽  
Petrică Popov ◽  
Silvestru Grozeanu
Keyword(s):  
Sea Water ◽  
Flow Characteristics ◽  
Modern Technology ◽  
Optimum Shape ◽  
Channel Axis ◽  
Electrically Conductive ◽  
Marine Propulsion ◽  
In Series ◽  
Physical Phenomena ◽  
Experimental And Theoretical Studies

Abstract Shortcomings of conventional propeller propulsion can theoretically be removed by using a modern technology - unconventional hydroelectromagnetic propeller or magnetohydrodynamic (MHD thruster), that highlights an application of great interest about physical phenomena that occur in the interaction between electromagnetic fields and electrically conductive fluids. In application to marine propulsion, investigations of a variety of physical phenomena was carried out, including the flow characteristics in a MHD duct, thrust efficiency and optimum shape of the duct. This paper presents related interaction phenomena between a magnetic induction, created by a d.c. electromagnet and d.c. current, perpendicular to the field, imposed by a voltage difference between two electrodes in the conductive sea water. The fluid is forced to the direction perpendicular to the plane where magnetic and electric fluxes are intersecting, this force is called the Lorentz force. Experimental and theoretical studies were carried out on small magnetohydrodynamic model (DC homopolar model) having two channels arranged in series or parallel. Each time the speed distribution was followed over the channel axis and perpendicular to channel axis.

scholarly journals Correction: Three-dimensional homo-nanostructured MnO2/nanographene membranes on a macroporous electrically conductive network for high performance supercapacitors

2017 ◽  
Vol 5 (6) ◽  
pp. 2987-2989 ◽  
Author(s):  
Dajun Wu ◽  
Shaohui Xu ◽  
Chi Zhang ◽  
Yiping Zhu ◽  
Dayuan Xiong ◽  
...  
Keyword(s):  
High Performance ◽  
Three Dimensional ◽  
Conductive Network ◽  
Electrically Conductive

Correction for ‘Three-dimensional homo-nanostructured MnO2/nanographene membranes on a macroporous electrically conductive network for high performance supercapacitors’ by Dajun Wu et al., J. Mater. Chem. A, 2016, 4, 11317–11329.

scholarly journals Hybrid Recentering Energy Dissipative Device for Seismic Protection

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
Wenke Tang ◽  
Eric M. Lui
Keyword(s):  
Energy Dissipation ◽  
Viscous Fluid ◽  
Numerical Study ◽  
Ground Motions ◽  
Maxwell Model ◽  
Viscous Damper ◽  
Hybrid Device ◽  
Fluid Damper ◽  
In Series ◽  
Viscous Fluid Damper

A hybrid recentering energy dissipative device that has both recentering and energy dissipation capabilities is proposed and studied in this paper. The proposed hybrid device, referred to as the hybrid shape memory alloy (SMA) recentering viscous fluid (RCVF) energy dissipation device, connects the apex of a chevron brace to an adjoining beam using two sets of SMA wires arranged in series on either side of the brace and a viscous fluid damper arranged in parallel with the SMA wires. The viscous damper is used because being a velocity-dependent device it does not exert any force that counteracts the recentering force from the SMA wires after the vibration of the frame ceases. In the numerical study, the Wilde’s SMA constitutive model is used to model the SMA wires, and the Maxwell model is used to simulate the viscous fluid damper. To demonstrate the viability and effectiveness of the proposed hybrid device, comparative studies are performed on several single-story shear frames and a series of four-story steel frames. The results show that the frames equipped with the hybrid device have noticeably smaller peak top story displacements and residual story drifts when subjected to ground motions at three different intensity levels.

Two-dimensional porous coordination polymers and nano-composites for electrocatalysis and electrically conductive applications

2020 ◽  
Vol 8 (29) ◽  
pp. 14356-14383
Author(s):  
Liang-Po Tang ◽  
Sa Yang ◽  
Dan Liu ◽  
Cong Wang ◽  
Yanqi Ge ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Crystalline Material ◽  
Organic Ligands ◽  
Nano Composites ◽  
Two Dimensional ◽  
Porous Coordination Polymers ◽  
Electrically Conductive ◽  
Coordination Bonds

Two-dimensional (2D) porous coordination polymers (PCPs) are a kind of porous crystalline material formed from metal nodes and organic ligands through coordination bonds.

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