scholarly journals Surfactant-Mediated Co-Existence of Single-Walled Carbon Nanotube Networks and Cellulose Nanocrystal Mesophases

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3059
Author(s):  
David Attia ◽  
Evgenee Yekymov ◽  
Yulia Shmidov ◽  
Yael Levi-Kalisman ◽  
Orit Mendelson ◽  
...  
Keyword(s):  
Mesh Size ◽  
Isotropic Phase ◽  
Ionic Surfactant ◽  
Single Walled Carbon Nanotube ◽  
X Ray ◽  
Single Walled Carbon ◽  
Chiral Nematic ◽  
Two Phases ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanotube Networks

Hybrids comprising cellulose nanocrystals (CNCs) and percolated networks of single-walled carbon nanotubes (SWNTs) may serve for the casting of hybrid materials with improved optical, mechanical, electrical, and thermal properties. However, CNC-dispersed SWNTs are depleted from the chiral nematic (N*) phase and enrich the isotropic phase. Herein, we report that SWNTs dispersed by non-ionic surfactant or triblock copolymers are incorporated within the surfactant-mediated CNC mesophases. Small-angle X-ray measurements indicate that the nanostructure of the hybrid phases is only slightly modified by the presence of the surfactants, and the chiral nature of the N* phase is preserved. Cryo-TEM and Raman spectroscopy show that SWNTs networks with typical mesh size from hundreds of nanometers to microns are distributed equally between the two phases. We suggest that the adsorption of the surfactants or polymers mediates the interfacial interaction between the CNCs and SWNTs, enhancing the formation of co-existing meso-structures in the hybrid phases.

Aligned fluorinated single-walled carbon nanotubes as a transmission channel towards attenuation of broadband electromagnetic waves

2018 ◽  
Vol 6 (35) ◽  
pp. 9399-9409 ◽  
Author(s):  
Yang Liu ◽  
Yichun Zhang ◽  
Cheng Zhang ◽  
Benyuan Huang ◽  
Xu Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electromagnetic Waves ◽  
Single Walled Carbon Nanotubes ◽  
Transmission Channel ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Strong Electrostatic Interaction ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanotube Networks

Highly fluorinated single-walled carbon nanotubes tend to be oriented under stress due to strong electrostatic interaction allowing directional propagation and then effective attenuation of electromagnetic waves by pristine single-walled carbon nanotube networks.

scholarly journals Switchable changes in the conductance of single-walled carbon nanotube networks on exposure to water vapour

Nanoscale ◽  
2017 ◽  
Vol 9 (31) ◽  
pp. 11279-11287 ◽  
Author(s):  
Gwyn. P. Evans ◽  
David. J. Buckley ◽  
Neal. T. Skipper ◽  
Ivan. P. Parkin
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Water Vapour ◽  
Single Walled Carbon Nanotubes ◽  
Ionic Surfactants ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanotube Networks

Noncovalent functionalisation of single-walled carbon nanotubes (SWCNTs) with ionic surfactants induces a switch in the conductance-humidity behaviour of SWCNT networks.

Synthesis of Single-Walled Carbon Nanotube Networks on Silicon Nanowires

2007 ◽  
Vol 561-565 ◽  
pp. 1205-1208
Author(s):  
Hideto Yoshida ◽  
Tetsuya Uchiyama ◽  
Jun Kikkawa ◽  
Hideo Kohno ◽  
Seiji Takeda
Keyword(s):  
Silicon Nanowires ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Single Walled Carbon Nanotubes ◽  
Catalyst Nanoparticles ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Co Catalysts ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanotube Networks

Single-walled carbon nanotubes (SWNTs) have been synthesized on silicon nanowires (SiNWs) by ethanol chemical vapor deposition (CVD) using Co catalysts nanoparticles. The surface SiOx layers assist the formation of catalyst nanoparticles on SiNWs by inhibiting the diffusion of Co to Si. Co-Si compounds have formed in SiNWs readily when the surface SiOx layers are very thin. Therefore, the yield of SWNTs is strongly influenced by the thickness of the surface SiOx layers of SiNWs.

scholarly journals Characteristic Features of Stone-Wales Defects in Single-Walled Carbon Nanotube; Adsorption, Dispersion, and Field Emission

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Seungkwang Roh ◽  
Jongtaek Lee ◽  
Mira Jang ◽  
Mingyeong Shin ◽  
Juone Ahn ◽  
...  
Keyword(s):  
Field Emission ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
X Ray ◽  
Single Walled Carbon ◽  
Adsorption Sites ◽  
Adsorption Behaviors ◽  
Characteristic Features ◽  
Walled Carbon Nanotubes ◽  
Pristine Swcnts

Adsorption behaviors of dodecanethiol (C12H25SH) molecules are investigated on the surface of single-walled carbon nanotubes (SWCNTs) with vibrational and X-ray photoelectron spectrometers. The active adsorption sites are proved as Stone-Wales (SW) defects (5–7 ring defects). The SW defect-removed SWCNTs formed by reacting nanotubes with allyl acrylate molecules are compared with pristine SWCNTs in dispersion and field emission. The former shows higher dispersion and field emission than the latter.

Hexahapto-lanthanide interconnects between the conjugated surfaces of single-walled carbon nanotubes

2014 ◽  
Vol 43 (20) ◽  
pp. 7379-7382 ◽  
Author(s):  
Matthew L. Moser ◽  
Xiaojuan Tian ◽  
Aron Pekker ◽  
Santanu Sarkar ◽  
Elena Bekyarova ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Lanthanide Metals ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanotube Networks

Organometallic bonding of lanthanide metals to the graphene sidewalls in single-walled carbon nanotube networks enhances the electrical conductivity, particularly in the case of Sm and Eu.

scholarly journals Supramolecular structures of terbium(iii) porphyrin double-decker complexes on a single-walled carbon nanotube surface

RSC Advances ◽  
2019 ◽  
Vol 9 (48) ◽  
pp. 28135-28145
Author(s):  
Ahmed I. A. Abd El-Mageed ◽  
Takuji Ogawa
Keyword(s):  
Carbon Nanotubes ◽  
Scanning Probe Microscopy ◽  
Single Walled Carbon Nanotubes ◽  
Supramolecular Structures ◽  
Scanning Probe ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Double Decker ◽  
Walled Carbon Nanotubes ◽  
First Time

For the first time, using scanning probe microscopy, the supramolecular structures of terbium porphyrin double-decker complexes were observed on single-walled carbon nanotubes surfaces, where the molecules formed a well-ordered self-assembled array.

Metal Coated Functionalized Single-Walled Carbon Nanotubes for Composites Application

2007 ◽  
Vol 561-565 ◽  
pp. 655-658 ◽  
Author(s):  
Qiang Zeng ◽  
Jennifer Luna ◽  
Y. Bayazitoglu ◽  
Kenneth Wilson ◽  
M. Ashraf Imam ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Metal Composite ◽  
X Ray ◽  
Single Walled Carbon ◽  
Transmission Electron ◽  
Nucleation Sites ◽  
Metal Composite Materials ◽  
Walled Carbon Nanotubes

This study is considered as a method for producing multifunctional metal composite materials by using Single-walled Carbon Nanotubes (SWNTs). In this research, various metals (Ni, Cu, Ag ) were successfully deposited onto the surface of SWNTs. It has been found that homogenous dispersion and dense nucleation sites are the necessary conditions to form uniform coating on SWNTs. Functionalization has been applied to achieve considerable improvement in the dispersion of purified single-walled carbon nanotubes. A three-step electroless plating approach was used and the coating mechanism is described in the paper. The samples were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and energy-dispersive X-ray spectroscopy (EDX). The application of coated SWNTs in Titanium will be discussed in this paper.

scholarly journals Free Vibration Analysis of Single Walled Carbon Nanotube with Exponentially Varying Stiffness

2018 ◽  
Vol 5 (1) ◽  
pp. 201-212 ◽  
Author(s):  
Subrat Kumar Jena ◽  
S. Chakraverty
Keyword(s):  
Free Vibration ◽  
Differential Quadrature Method ◽  
Free Vibration Analysis ◽  
Beam Theory ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Scaling Parameters ◽  
Governing Differential Equation ◽  
Theory Application ◽  
Walled Carbon Nanotubes

Abstract In this paper, Differential Quadrature Method (DQM) is applied to investigate free vibration of Single Walled Carbon Nanotubes (SWCNTs) with exponentially varying stiffness based on non-local Euler-Bernoulli beam theory. Application of DQ method in the governing differential equation converts the problem to a generalized eigenvalue problem and its solution gives frequency parameters. Convergence of the results show that DQM solutions converge fast. In this article, a detailed investigation has been reported and MATLAB code has been developed to analyze the numerical results for different scaling parameters as well as for four types of boundary conditions. Present results are compared with other available results and are found to be in good agreement.

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