Carbon Nanotube-Induced Planarization of Conjugated Polymers in Solution

2004 ◽  
Vol 858 ◽  
Author(s):  
Jian Chen ◽  
Rajagopal Ramasubramaniam ◽  
Haiying Liu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Conjugated Polymers ◽  
Spectroscopic Study ◽  
Surface Quality ◽  
Hybrid Materials ◽  
Conjugated Polymer ◽  
Visible Absorption ◽  
The Impact ◽  
Conformational Interaction

ABSTRACTThe understanding of the conformational interaction between conjugated polymers and carbon nanotubes in solution is essential to develop the applications of carbon nanotubes, particularly conjugated polymer-carbon nanotube hybrid materials. The visible absorption spectroscopic study shows that curved carbon nanotube surfaces can induce the planarization of individual conjugated polymers such as poly(p-phenyleneethynylene)s and poly(3-alkylthiophene)s in solution. The impact of nanotube surface quality on the interaction between carbon nanotubes and conjugated polymers is investigated.

The impact of the Marangoni convection and magnetic field versus blood-based carbon nanotube nanofluids

2019 ◽  
Vol 234 (1-2) ◽  
pp. 37-46
Author(s):  
Taza Gul ◽  
Ramla Akbar ◽  
Zafar Zaheer ◽  
Iraj S Amiri
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Marangoni Convection ◽  
Thin Liquid Film ◽  
Casson Fluid ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
The Impact

The mutual result of the magnetic field and Marangoni convection against the thin liquid film of Casson fluid, blood-based carbon nanotube nanofluid has been fruitfully discussed in this article. The influence of various model constraints is focused on velocity, heat transfer, pressure distribution, skin friction and Nusselt number through graphical illustration. In addition, we witness that the thermal field of liquid raises with the growing value of [Formula: see text] and this upsurge is more in single-walled carbon nanotubes and is more dominant than multi-walled carbon nanotubes. The controlling approach of the homotopy analysis method has been used for velocity and temperature distribution. For authentication, the achieved results have been associated with the numerical (ND-Solve) method and displayed. This investigation shows that the velocity profile in the case of Casson fluid single-walled carbon nanotube–blood nanofluid is comparatively less affected and the temperature field of single-walled carbon nanotube–blood nanofluid dominates multi-walled carbon nanotube–blood nanofluid.

THE EFFECT OF FILTER TYPE, CONCENTRATION, AND TYPE OF CARBON NANOTUBE ON THE BUCKYPAPER SURFACE QUALITY

2011 ◽  
Vol 10 (01n02) ◽  
pp. 19-22
Author(s):  
M. KAMALVAND ◽  
M. MADHKHAN ◽  
B. HAMIDI ◽  
A. VAHEDI ◽  
S. ZIAEI-RAD ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Surface Quality ◽  
Thin Sheet ◽  
Stable Solution ◽  
Suitable Material ◽  
Pore Sizes ◽  
Stable Suspension ◽  
Filter Type

Buckypaper is a thin sheet fabricated from the aggregation of carbon nanotubes. The generally accepted method for forming such carbon nanotube (CNT) films involves the use of stable suspension of carbon nanotubes in water. These suspensions can then be membrane-filtered under pressure to yield uniform films. After preparation of a stable solution, it should be membrane-filtrated on the surface of a filter. Usually, the quality of a buckypaper depends on sonication time and power, surfactant type and concentration, filter type, and concentration of carbon nanotube. In order to investigate the surface quality of buckypapers, low-magnification images could give rather useful information about the roughness of surface. Analysis of the 100 × images clearly shows that with increasing the suspension concentration, the smoothness of buckypaper surface will decrease. Therefore, from this viewpoint, decreasing the concentration can enhance the quality of the buckypaper. Surface of the filter also affects on the buckypaper quality. Therefore, for filtration of the suspension, a filter with suitable material, pore sizes, and surface should be used. As the pore sizes of the filter are usually small, the filtration process may be very time-consuming. Since the process is carring out under pressure and also due to the brittle nature of the buckypaper, removal of the buckypaper from the surface of the filter is a very serious and important stage and depends on the filter type, concentration, and type of CNTs. The buckypaper usually can be removed from the filter mechanically. The type of CNTs (MWNT or SWNT) may change the above-mentioned factors.

Performance characteristics of polyethylene/old corrugated container composites reinforced with carbon nanotubes

2016 ◽  
Vol 51 (18) ◽  
pp. 2665-2673 ◽  
Author(s):  
Behzad Kord ◽  
Mehdi Roohani
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
High Density Polyethylene ◽  
Analysis Data ◽  
High Density ◽  
Scanning Calorimetry ◽  
Polyethylene Matrix ◽  
Melt Compounding ◽  
The Impact ◽  
Thermal Stability Of

The physical, mechanical, thermal, and flammability properties of high-density polyethylene/old corrugated container composites reinforced with carbon nanotubes are presented in this study. High-density polyethylene/old corrugated container composites with different loadings of carbon nanotube (0, 1, 3, and 5 phc) were prepared by melt compounding followed by injection molding. Results indicated that the incorporation of carbon nanotube into high-density polyethylene, significantly improved the mechanical properties of the composites. The tensile and flexural properties achieved the maximum values when 3 phc carbon nanotube was added. Meanwhile, the impact strength of the composites progressively decreased with increasing carbon nanotube content. Furthermore, the water absorption and thickness swelling of the samples remarkably reduced with the addition of carbon nanotube. From thermogravimetric analysis data, the presence of carbon nanotube could enhance the thermal stability of the composites, especially the maximum weight loss rate temperature and also the better char residual was obtained at high loading level of carbon nanotube. Simultaneous differential scanning calorimetry thermograms revealed that the thermal degradation temperatures for the samples with carbon nanotube were much higher than those made without carbon nanotube. Moreover, it was found that the addition of carbon nanotube results in a significant enhancement in flame retardancy of the composites. Morphological observations showed that the nanoparticles were predominantly dispersed uniformly within the high-density polyethylene matrix.

scholarly journals Impact of sterilization on a conjugated polymer based bioelectronic patch

2021 ◽  
Author(s):  
Yihan Yan ◽  
Lorenzo Travaglini ◽  
Kieran Lau ◽  
Jelena Rnjak-Kovacina ◽  
Minoo Eslami ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Conjugated Polymers ◽  
Electronic Properties ◽  
Conjugated Polymer ◽  
Active Material ◽  
High Dose ◽  
Γ Irradiation ◽  
The Impact

ABSTRACTTranslation into the clinic of organic bioelectronic devices having conjugated polymers as the active material will hinge on their long-term operation in vivo. This will require the device to be subject to clinically approved sterilization techniques without a deterioration in its physical and electronic properties. To date, there remains a gap in the literature addressing the impact of this critical pre-operative procedure on the properties of conjugated polymers. This study aims to address this gap by assessing the physical and electronic properties of a sterilized porous bioelectronic patch having polyaniline as the conjugated polymer. The patch was sterilized by autoclave, ethylene oxide and gamma (γ-) irradiation at 15, 25, and 50 kGy doses. Autoclaving resulted in cracking and macroscopic degradation of the patch, while patches sterilized by γ-irradiation at 50 kGy exhibited reduced mechanical and electronic properties, attributed to chain scission and non-uniform crosslinking caused by the high dose irradiation. Ethylene oxide and γ-irradiation at 15 and 25 kGy sterilization appeared to be the most effective at maintaining the mechanical and electronic properties of the patch, as well as inducing a minimal immune response as revealed by a receding fibrotic capsule after 4 weeks implantation. Our findings pave the way towards closing the gap for the translation of organic bioelectronic devices from acute to long-term in vivo models.

Complexes of conjugated polymer and carbon nanotubes: does blending with nanotubes influence the ordering of semi-crystalline polymers?

2005 ◽  
Vol 901 ◽  
Author(s):  
Roland Goh ◽  
Eric Rolfe Waclawik ◽  
Nunzio Motta ◽  
John Marcus Bell
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Absorption Spectra ◽  
Polymer Chain ◽  
Self Assembly ◽  
Conjugated Polymer ◽  
Single Walled Carbon Nanotubes ◽  
Crystalline Polymers ◽  
High Degree ◽  
Walled Carbon Nanotubes

AbstractA detailed study of poly(alkylthiophene) self-assembly and organization on single-walled carbon nanotubes is presented. We show that ordered polymer domains are formed when a conjugated polymer is blended with small amounts of carbon nanotubes. By correlating the lowest energy feature in the absorption spectra of the polymer with ordering, we demonstrate that the degree of ordering in the polymer is enhanced when it is blended with carbon nanotubes. Furthermore, we elucidated the conformation of the polymer chain when it is absorbed onto the nanotube surface and imaged the high degree of ordering in the polymer/carbon nanotube complex by microscopy.

Preparation of bright-emissive hybrid materials based on light-harvesting POSS having radially integrated luminophores and commercial π-conjugated polymers

2019 ◽  
Vol 3 (2) ◽  
pp. 314-320 ◽  
Author(s):  
Masayuki Gon ◽  
Keita Sato ◽  
Keigo Kato ◽  
Kazuo Tanaka ◽  
Yoshiki Chujo
Keyword(s):  
Conjugated Polymers ◽  
Hybrid Materials ◽  
Polymer Films ◽  
Conjugated Polymer ◽  
Light Harvesting ◽  
Photoluminescence Properties

Photoluminescence properties of π-conjugated polymer films are dramatically enhanced by hybridization with a light-harvesting POSS having radially-integreated luminophores.

scholarly journals Electroactive polymer/carbon nanotube hybrid materials for energy storage synthesized via a “grafting to” approach

RSC Advances ◽  
2017 ◽  
Vol 7 (28) ◽  
pp. 17301-17310 ◽  
Author(s):  
Bruno Ernould ◽  
Olivier Bertrand ◽  
Andrea Minoia ◽  
Roberto Lazzaroni ◽  
Alexandru Vlad ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Energy Storage ◽  
Hybrid Materials ◽  
Electroactive Polymer ◽  
Li Ion Batteries ◽  
Multi Walled Carbon Nanotubes ◽  
Li Ion ◽  
Walled Carbon Nanotubes

Poly(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl methacrylate) has been grafted onto multi-walled carbon nanotubes to obtain conducting organic cathodes for Li-ion batteries.

ROLE OF DEFECTS IN CARBON NANOTUBE CIRCUITS

2002 ◽  
Vol 01 (03n04) ◽  
pp. 247-254
Author(s):  
A. T. JOHNSON ◽  
M. FREITAG ◽  
M. RADOSAVLJEVIC ◽  
S. V. KALININ ◽  
D. A. BONNELL
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Quantitative Agreement ◽  
Single Wall Carbon Nanotubes ◽  
Metallic State ◽  
Scanning Gate Microscopy ◽  
Electrostatic Doping ◽  
Scanning Gate ◽  
The Impact

We summarize recent results on the impact of defects on the electronic properties of single-wall carbon nanotubes. We probe the influence of defects on electron transport in CNFETs by combined scanning gate microscopy (SGM) and scanning impedance microscopy (SIM). Depletion surface potential of individual defects is quantified from the SGM-imaged defect radius as a function of tip bias voltage. This provides a measure of the Fermi level at the defect with zero tip voltage. In the "off" state, transport is first dominated by barriers at depleted defects. It becomes diffusive as the CNFET is turned on, and finally is quasi-ballistic in the regime of "degenerate electrostatic doping". Metallic nanotubes with good contacts show a metal-to-insulator crossover as the gate voltage is varied. In the metallic state we see quantitative agreement with the "twiston" scattering picture.

scholarly journals Fluorescence Modulation of Conjugated Polymer Nanoparticles Embedded in Poly(N-Isopropylacrylamide) Hydrogel

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4315
Author(s):  
Ho Namgung ◽  
Seonyoung Jo ◽  
Taek Seung Lee
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Excitation Wavelength ◽  
Visible Absorption ◽  
Polymer Hydrogel ◽  
Polymer Dots ◽  
Phenylene Group ◽  
Conjugated Polymer Nanoparticles ◽  
Fluorescence Modulation ◽  
Reprecipitation Method

A series of conjugated polymers (CPs) emitting red, green, and blue (RGB) fluorescence were synthesized via the Suzuki coupling polymerization. Polymer dots (Pdots) were fabricated by the reprecipitation method from corresponding CPs, in which the Pdot surface was functionalized to have an allyl moiety. The CP backbones were based on the phenylene group, causing the Pdots to show identical ultraviolet-visible absorption at 350 nm, indicating that the same excitation wavelength could be used. The Pdots were covalently embedded in poly(N-isopropylacrylamide) (PNIPAM) hydrogel for further use as a thermoresponsive moiety in the polymer hydrogel. The polymer hydrogel with RGB emission colors could provide thermally reversible fluorescence changes. The size of the hydrogel varied with temperature change because of the PNIPAM’s shrinking and swelling. The swollen and contracted conformations of the Pdot-embedded PNIPAM enabled on-and-off fluorescence, respectively. Fluorescence modulation with 20 to 80% of the hydrogel was possible via thermoreversibility. The fluorescent hydrogel could be a new fluorescence-tuning hybrid material that changes with temperature.

Zinc and Aluminum Phthalocyanine Modified Carbon Nanotubes; Preparation and Characterizations

2021 ◽  
Vol 19 (9) ◽  
pp. 132-141
Author(s):  
Shaymaa Hussein Nowfal ◽  
Hikmat Adnan Banimuslem ◽  
Nassar A. Al-Isawi ◽  
Hayder M.A. Ghanimi
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Hybrid Materials ◽  
Vital Role ◽  
Zinc Phthalocyanine ◽  
Visible Absorption ◽  
Current Voltage ◽  
Multi Walled Carbon Nanotubes ◽  
Modified Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this work, two elements were developed. The first is Multi walled carbon nanotubes-zinc phthalocyanine (ZnPcs). In addition, there was also a development of the multi walled carbon nanotubes-aluminium phthalocyanine hybrid materials. The multi-walled carbon nanotubes were under treated with nitric combined with the sulfuric acid before being mixed with phthalocyanines to de-build the effects. Drop-casting hybrid materials to slides of the glass and interdigitating electrodes from their dimethylformamide solution have been done. The perfect hybridization owing to π-π interaction was discovered. This discovery was assisted by two elements. The first is the ultraviolet-visible absorption spectroscopy. Moreover, another element that played a vital role in this discovery is Fourier Transform Infrared Spectroscopy. The hybrid films were tested for current-voltage measurements and direct electrical conductivity. This work has also examined how temperature affects direct electrical conductivity and power generation.

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