Electric field mediated separation of water–ethanol mixtures in carbon-nanotubes integrated in nanoporous graphene membranes

2018 ◽  
Vol 209 ◽  
pp. 259-271 ◽  
Author(s):  
Manash Pratim Borthakur ◽  
Dipankar Bandyopadhyay ◽  
Gautam Biswas
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Orientation Angle ◽  
Field Orientation ◽  
Tunable Separation ◽  
Nanoporous Graphene ◽  
Graphene Membranes

The tunable separation of water–ethanol mixtures inside CNTs by varying the electric field orientation angle θ.

Influence of electric field type on the assembly of single walled carbon nanotubes

2004 ◽  
Vol 383 (3-4) ◽  
pp. 235-239 ◽  
Author(s):  
M. Senthil Kumar ◽  
T.H. Kim ◽  
S.H. Lee ◽  
S.M. Song ◽  
J.W. Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Field Type ◽  
Walled Carbon Nanotubes

Hormones Nanofiltration in Carbon Nanotubes and Boron Nitride Nanotubes Using Uniform External Electric Field Through Molecular Dynamics

2021 ◽  
Vol 21 (11) ◽  
pp. 5499-5509
Author(s):  
Rosely Maria dos Santos Cavaleiro ◽  
Tiago da Silva Arouche ◽  
Phelipe Seiichi Martins Tanoue ◽  
Tais Souza Sá Pereira ◽  
Raul Nunes de Carvalho Junior ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Boron Nitride ◽  
Electric Field ◽  
Field Potential ◽  
Boron Nitride Nanotubes ◽  
Attractive Potential ◽  
Water Molecules ◽  
Computer Simulation Study ◽  
Simulation Time

Hormones are a dangerous group of molecules that can cause harm to humans. This study based on classical molecular dynamics proposes the nanofiltration of wastewater contaminated by hormones from a computer simulation study, in which the water and the hormone were filtered in two single-walled nanotube compositions. The calculations were carried out by changing the intensities of the electric field that acted as a force exerting pressure on the filtration along the nanotube, in the simulation time of 100 ps. The hormones studied were estrone, estradiol, estriol, progesterone, ethinylestradiol, diethylbestrol, and levonorgestrel in carbon nanotubes (CNTs) and boron nitride (BNNTs). The most efficient nanofiltrations were for fields with low intensities in the order of 10-8 au and 10-7 au. The studied nanotubes can be used in membranes for nanofiltration in water treatment plants due to the evanescent field potential caused by the action of the electric field inside. Our data showed that the action of EF in conjunction with the van der Walls forces of the nanotubes is sufficient to generate the attractive potential. Evaluating the transport of water molecules in CNTs and BNNTs, under the influence of the electric field, a sequence of simulations with the same boundary conditions was carried out, seeking to know the percentage of water molecules filtered in the nanotubes.

Speed Estimation Method for Sensor Less Control of AC Motor Drives Based on Stator Field Orientation

2011 ◽  
Vol 130-134 ◽  
pp. 1361-1364
Author(s):  
Shou Qiang Chen ◽  
Fan Li ◽  
Yu Long
Keyword(s):  
Direct Torque Control ◽  
Estimation Method ◽  
Orientation Angle ◽  
Torque Control ◽  
Speed Estimation ◽  
Field Orientation ◽  
Orientation Control ◽  
Ac Motor ◽  
Field Orientation Control ◽  
Estimation Scheme

Based on stator-field-orientation control combining with both direct torque control (DTC) and rotor-field-orientation control a speed estimation scheme is presented in this paper. Two key problems are discussed in detail. First is to use phase operation to decide stator-field-orientation angle θs and then the discrete-tracking-differential (DTD) technique is employed to high quality stator current. The experiments show that accurate speed estimation can be obtained by the method.

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