scholarly journals Carboxylated Capped Carbon Nanotubes Interacting with Nimesulide Molecules: Applied Electric Fields Effects

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Vivian Machado de Menezes ◽  
Ivana Zanella ◽  
Solange Binotto Fagan
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Carbon Nanotube ◽  
Ab Initio ◽  
Electric Fields ◽  
Carboxyl Group ◽  
External Electric Fields ◽  
Drug Delivery Applications ◽  
Repulsive Forces

Interactions of carboxylated capped carbon nanotubes with nimesulide molecules under electric fields were investigated byab initiosimulations. Repulsive forces between the nimesulide molecules and the carboxyl group of the carbon nanotubes, except for the nimesulide radical configuration, were observed. To keep the original molecule in the pristine form, electric fields with different intensities were applied, where changes in the behavior of the interactions between the molecules were noticed. It was shown that the intensity of the interaction between the nimesulide and the hydrophilic carboxylated capped carbon nanotube can be modulated by the action of the external electric fields making promising systems for drug delivery applications.

scholarly journals Optical properties of carbon nanotubes under external electric fields

2006 ◽  
Vol 36 (2a) ◽  
pp. 440-442 ◽  
Author(s):  
M. Pacheco ◽  
Z. Barticevic ◽  
A. Latgé ◽  
C. G. Rocha
Keyword(s):  
Carbon Nanotubes ◽  
Optical Properties ◽  
Electric Fields ◽  
External Electric Fields

scholarly journals Possibility of realizing superionic ice VII in external electric fields of planetary bodies

2020 ◽  
Vol 6 (21) ◽  
pp. eaaz2915 ◽  
Author(s):  
Zdenek Futera ◽  
John S. Tse ◽  
Niall J. English
Keyword(s):  
Molecular Dynamics ◽  
Electric Field ◽  
Ab Initio ◽  
Electric Fields ◽  
State Of The Art ◽  
Ab Initio Molecular Dynamics ◽  
Theoretical Studies ◽  
Potential Candidate ◽  
External Electric Fields ◽  
Ice Phase

In a superionic (SI) ice phase, oxygen atoms remain crystallographically ordered while protons become fully diffusive as a result of intramolecular dissociation. Ice VII’s importance as a potential candidate for a SI ice phase has been conjectured from anomalous proton diffusivity data. Theoretical studies indicate possible SI prevalence in large-planet mantles (e.g., Uranus and Neptune) and exoplanets. Here, we realize sustainable SI behavior in ice VII by means of externally applied electric fields, using state-of-the-art nonequilibrium ab initio molecular dynamics to witness at first hand the protons’ fluid dance through a dipole-ordered ice VII lattice. We point out the possibility of SI ice VII on Venus, in its strong permanent electric field.

The Attachment of Carbon Nanotube on a Blunt AFM Tip Using Electric Fields

2004 ◽  
Author(s):  
Hyung Woo Lee ◽  
Soon Geun Kwon ◽  
Soo Hyun Kim ◽  
Yoon Keun Kwak ◽  
Chang Soo Han
Keyword(s):  
Carbon Nanotubes ◽  
Atomic Force Microscopy ◽  
Carbon Nanotube ◽  
Electric Fields ◽  
Low Cost ◽  
Reliable Technique ◽  
Force Microscopy ◽  
Atomic Force

We report a simple, low cost, reliable technique of making carbon nanotube (CNT) modified atomic force microscopy (AFM) tip. We used the dielectrophoresis and the electrophoresis to align and deposit carbon nanotubes on the end of the AFM tip. From the simulation and the various experiments, we obtained the optimal electric condition, 0.32Vpp/μm. Also, we found that the blunt shape of the tip’s apex is more effective than sharpened one. Through the experiments, we verified that the blunt shape is more effective over 50% than the sharpened one in the attachment of CNTs. By comparing the scanning results between the CNT modified tip and a normal AFM tip, we obtained the improvement in efficiency of 23%.

Highly Organized Carbon Nanotube-PDMS Hybrid System for Multifunctional Flexible Devices

2007 ◽  
Author(s):  
Yung J. Jung ◽  
Laila Jaber-Ansari ◽  
Xugang Xiong ◽  
Sinan Mu¨ftu¨ ◽  
Ahmed Busnaina ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Fields ◽  
Composite Structures ◽  
Field Enhancement ◽  
Chemical Vapor ◽  
Casting Process ◽  
Dip Coating ◽  
Network Architectures ◽  
Multiwalled Carbon

We will present a method to fabricate a new class of hybrid composite structures based on highly organized multiwalled carbon nanotube (MWNT) and singlewalled carbon nanotube (SWNT) network architectures and a polydimethylsiloxane (PDMS) matrix for the prototype high performance flexible systems which could be used for many daily-use applications. To build 1–3 dimensional highly organized network architectures with carbon nanotubes (both MWNT and SWNT) in macro/micro/nanoscale we used various nanotube assembly processes such as selective growth of carbon nanotubes using chemical vapor deposition (CVD) and self-assembly of nanotubes on the patterned trenches through solution evaporation with dip coating. Then these vertically or horizontally aligned and assembled nanotube architectures and networks are transferred in PDMS matrix using casting process thereby creating highly organized carbon nanotube based flexible composite structures. The PDMS matrix undergoes excellent conformal filling within the dense nanotube network, giving rise to extremely flexible conducting structures with unique electromechanical properties. We will demonstrate its robustness under large stress conditions, under which the composite is found to retain its conducting nature. We will also demonstrate that these structures can be directly utilized as flexible field-emission devices. Our devices show some of the best field enhancement factors and turn-on electric fields reported so far.

The “click-on-tube” approach for the production of efficient drug carriers based on oxidized multi-walled carbon nanotubes

2016 ◽  
Vol 4 (21) ◽  
pp. 3823-3831 ◽  
Author(s):  
Stefano Fedeli ◽  
Alberto Brandi ◽  
Lorenzo Venturini ◽  
Paola Chiarugi ◽  
Elisa Giannoni ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Carbon Nanotube ◽  
Drug Delivery System ◽  
Delivery System ◽  
Drug Carriers ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Straightforward Approach

An efficient drug delivery system through a straightforward approach to multi-walled carbon nanotube decoration.

Nanohybrid Nanoparticles Based on Chitosan/Functionalized Carbon Nanotubes as Anti-HIV Nanocarrier

NANO ◽  
2015 ◽  
Vol 10 (01) ◽  
pp. 1550010 ◽  
Author(s):  
R. Afshari ◽  
S. Mazinani ◽  
M. Abdouss
Keyword(s):  
Carbon Nanotubes ◽  
Drug Delivery ◽  
Carbon Nanotube ◽  
Drug Delivery Systems ◽  
Drug Loading ◽  
Delivery Systems ◽  
Potential Applications ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Carbon nanotube-natural biopolymer nanovectors have important potential applications in delivery system for drugs and biomolecules. In this work, the use of multi-walled carbon nanotubes (MWCNT) as nanoreservoirs for drug loading and controlled release is demonstrated. We synthesized different carbon nanotube-based drug delivery systems including acid and amide-functionalized MWCNT; chitosan (CS) covalently grafted to functionalized MWCNT and MWCNT-CS nanoparticles (NPs) using an ionotropic gelation method as a sustained-release systems for delivery of Tenofovir (hydrophilic anti-retroviral drug). The prepared NPs as different drug delivery systems were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). As it is shown, in vitro drug release studies indicated that the cumulative release rate of Tenofovir from MWCNT–CS NPs shows the best result and it reaches the maximum value (90%) after about 120 h. Moreover, comparing to ungrafted CNTs, MWCNT–CS shows high dispersability and long-term stability in aqueous medium which approves the effective solubilization of MWCNT followed by grafting with CS.

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