Electric-Field-Driven Fluid Flow Around Nano Particles

2004 ◽  
Author(s):  
Jaehyun Chung ◽  
Kyong-Hoon Lee ◽  
Rodney S. Ruoff ◽  
Junghoon Lee
Keyword(s):  
Carbon Nanotubes ◽  
Fluid Flow ◽  
Electric Field ◽  
Flow Patterns ◽  
Periodic Array ◽  
Nano Particles ◽  
Significant Progress ◽  
Modeling Simulation ◽  
Guided Assembly

Recently there has been significant progress in assembling an array of individual carbon nanotubes (CNTs) on microfabricated electrodes using the Composite Electric-field Guided Assembly (CEGA) method. This technology allows for integrating individual nano components with micro/nano systems, and should find application in areas such as sensors and NEMS devices. For realizing this as a viable technology, it is crucial to understand the electric-field-driven flow around the nanostructures being deposited. We previously discovered that the flow patterns that are present can lead to deposition of a periodic array CNTs. Here, we present recent experimental observations and the results of modeling/simulation on the electric-field-driven flow around CNTs. The results suggest that this method of assembling nanostructures be used for integration with an accuracy approaching tens of nanometers.

CNT Extracted Lithography

2003 ◽  
Author(s):  
Jaehyun Chung ◽  
Kyong-Hoon Lee ◽  
Junghoon Lee
Keyword(s):  
Carbon Nanotubes ◽  
Electron Beam ◽  
Electric Field ◽  
High Accuracy ◽  
Electron Beam Evaporation ◽  
Metal Deposition ◽  
High Quality ◽  
Guided Assembly ◽  
Nanoscale Features

High quality nanoscale gaps were fabricated using carbon nanotubes (CNTs) as shadow masks for metal deposition. We used electric-field guided assembly to deposit and individual multi-walled CNT (MWCNT) across a pair of electrodes. Metal was deposited by electron-beam evaporation on the substrate where MWCNT was assembled. Then, the MWCNT was removed by sonication, leaving a pattern that replicates the shape of the MWCNT. This approach enables a mass fabrication of well-defined nanoscale features aligned and positioned with high accuracy.

LOW CONCENTRATION LIMIT FOR A FLUID FLOW THROUGH A FILTER

1998 ◽  
Vol 08 (04) ◽  
pp. 623-643 ◽  
Author(s):  
SANJA MARUŠIĆ
Keyword(s):  
Asymptotic Behavior ◽  
Fluid Flow ◽  
Volume Fraction ◽  
Periodic Array ◽  
Concentration Limit ◽  
Global Flow ◽  
Low Concentration ◽  
Flow Through ◽  
Low Volume ◽  
Filtration Law

A fluid flow through an ∊-periodic array of obstacles distributed on a hypersurface (filter) is considered. The study of the asymptotic behavior as ∊→0 for two critical sizes of obstacles ∊ and ∊2 gives two different laws describing a global flow. In this paper we study the case of an intermediate obstacle size ∊β, 1 < β < 2 and we prove the continuity of the filtration law in the low-volume fraction limit.

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.

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