scholarly journals Influence of Carbon Nanotubes Concentration on Mechanical and Electrical Properties of Poly(styrene-co-acrylonitrile) Composite Yarns Electrospun

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3655
Author(s):  
Rubén Caro-Briones ◽  
Blanca Estela García-Pérez ◽  
Eduardo San Martín-Martínez ◽  
Héctor Báez-Medina ◽  
Irlanda Grisel Cruz-Reyes ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Elastic Modulus ◽  
Electrical Properties ◽  
Load Transfer ◽  
Artificial Muscle ◽  
Electrical Current ◽  
Polymeric Matrix ◽  
Mechanical And Electrical Properties ◽  
Polymeric Solutions ◽  
Nanotube Dispersion

In this work, the influence of carbon nanotubes (CNTs) content on the mechanical and electrical properties of four series of polymeric matrix were made and their cytotoxicity on cells was evaluated to consider their use as a possible artificial muscle. For that, polymer composite yarns were electrospun using polymeric solutions at 10 wt.%. of poly(styrene-co-acrylonitrile) P(S:AN) and P(S:AN-acrylic acid) P(S:AN-AA) at several monomeric concentrations, namely 0:100, 20:80, 40:60, 50:50 (wt.%:wt.%), and 1 wt.% of AA. Carbon nanotubes (CNTs) were added to the polymeric solutions at two concentrations, 0.5 and 1.0 wt.%. PMCs yarns were collected using a blade collector. Mechanical and electrical properties of polymeric yarns indicated a dependence of CNTs content into yarns. Three areas could be found in fibers: CNTs bundles zones, distributed and aligned CNTs zones, and polymer-only zones. PMCs yarns with 0.5 wt.% CNTs concentration were found with a homogenous nanotube dispersion and axial alignment in polymeric yarn, ensuring load transfer on the polymeric matrix to CNTs, increasing the elastic modulus up to 27 MPa, and a maximum electrical current of 1.8 mA due to a good polymer–nanotube interaction.

scholarly journals FRACTAL APPROACH TO MECHANICAL AND ELECTRICAL PROPERTIES OF GRAPHENE/SIC COMPOSITES

2021 ◽  
Vol 19 (2) ◽  
pp. 271
Author(s):  
Yu-Ting Zuo ◽  
Hong-Jun Liu
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Fractal Theory ◽  
Bright Light ◽  
Fractal Dimensions ◽  
Mechanical Analysis ◽  
New Era ◽  
Fractal Approach ◽  
Mechanical And Electrical Properties ◽  
Sic Composites

Graphene and carbon nanotubes have a Steiner minimum tree structure, which endows them with extremely good mechanical and electronic properties. A modified Hall-Petch effect is proposed to reveal the enhanced mechanical strength of the SiC/graphene composites, and a fractal approach to its mechanical analysis is given.  Fractal laws for the electrical conductivity of graphene, carbon nanotubes and graphene/SiC composites are suggested using the two-scale fractal theory. The Steiner structure is considered as a cascade of a fractal pattern. The theoretical results show that the two-scale fractal dimensions and the graphene concentration play an important role in enhancing the mechanical and electrical properties of graphene/SiC composites. This paper sheds a bright light on a new era of the graphene-based materials.

Flexible resistance-type strain sensors toward monitoring finger movements

Synlett ◽  
2021 ◽  
Author(s):  
Chao Lu ◽  
Xi Chen
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Composite Films ◽  
Strain Sensors ◽  
Sensitive Strain ◽  
Nanocomposite Films ◽  
Finger Movements ◽  
Resistance Response ◽  
Mechanical And Electrical Properties ◽  
Highly Sensitive

Flexible strain sensors with superior flexibility and high sensitivity are critical to artificial intelligence. And it is favorable to develop highly sensitive strain sensors with simple and cost effective method. Here, we have prepared carbon nanotubes enhanced thermal polyurethane nanocomposites with good mechanical and electrical properties for fabrication of highly sensitive strain sensors. The nanomaterials have been prepared through simple but effective solvent evaporation method, and the cheap polyurethane has been utilized as main raw materials. Only a small quantity of carbon nanotubes with mass content of 5% has been doped into polyurethane matrix with purpose of enhancing mechanical and electrical properties of the nanocomposites. As a result, the flexible nanocomposite films present highly sensitive resistance response under external strain stimulus. The strain sensors based on these flexible composite films deliver excellent sensitivity and conformality under mechanical conditions, and detect finger movements precisely under different bending angles.

scholarly journals A Novel Toolkit for Characterizing the Mechanical and Electrical Properties of Engineered Neural Tissues

Biosensors ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 51 ◽  
Author(s):  
Meghan Robinson ◽  
Karolina Valente ◽  
Stephanie Willerth
Keyword(s):  
Elastic Modulus ◽  
Electrical Properties ◽  
Elastic Moduli ◽  
Direct Method ◽  
Hydrogel Scaffolds ◽  
Force Microscopy ◽  
Mechanical And Electrical Properties ◽  
Atomic Force ◽  
Neural Tissues ◽  
Electrical Signaling

We have designed and validated a set of robust and non-toxic protocols for directly evaluating the properties of engineered neural tissue. These protocols characterize the mechanical properties of engineered neural tissues and measure their electrophysical activity. The protocols obtain elastic moduli of very soft fibrin hydrogel scaffolds and voltage readings from motor neuron cultures. Neurons require soft substrates to differentiate and mature, however measuring the elastic moduli of soft substrates remains difficult to accurately measure using standard protocols such as atomic force microscopy or shear rheology. Here we validate a direct method for acquiring elastic modulus of fibrin using a modified Hertz model for thin films. In this method, spherical indenters are positioned on top of the fibrin samples, generating an indentation depth that is then correlated with elastic modulus. Neurons function by transmitting electrical signals to one another and being able to assess the development of electrical signaling serves is an important verification step when engineering neural tissues. We then validated a protocol wherein the electrical activity of motor neural cultures is measured directly by a voltage sensitive dye and a microplate reader without causing damage to the cells. These protocols provide a non-destructive method for characterizing the mechanical and electrical properties of living spinal cord tissues using novel biosensing methods.

scholarly journals Mechanical and electrical properties of multi-walled carbon nanotubes by nano-manipulator

2011 ◽  
Vol 10 ◽  
pp. 2917-2922 ◽  
Author(s):  
Hoon-Sik Jang ◽  
Sang Koo Jeon ◽  
Hak Joo Lee ◽  
Seung Hoon Nahm
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Mechanical And Electrical Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

ELASTOMERIC COMPOSITES BASED ON NANOSPHERICAL PARTICLES AND CARBON NANOTUBES: A COMPARATIVE STUDY

2013 ◽  
Vol 86 (3) ◽  
pp. 423-448 ◽  
Author(s):  
Liliane Bokobza
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Aspect Ratio ◽  
Carbon Black ◽  
Spherical Particles ◽  
Styrene Butadiene Rubber ◽  
Mechanical And Electrical Properties ◽  
Polymer Filler ◽  
Spherical Silica

ABSTRACT The reinforcement of elastomeric materials by addition of mineral fillers represents one of the most important aspects in the field of rubber science and technology. The improvement in mechanical properties arises from hydrodynamic effects depending mainly on the amount of filler and the aspect ratio of the particles and also on polymer–filler interactions depending on the surface characteristics of the filler particles and the chemical nature of the polymer. The past few years have seen the extensive use of nanometer-scale particles of different morphologies on account of the small size of the filler and the corresponding increase in the surface area that allow a considerable increase in mechanical properties even at very low filler loading. Among these nanoparticles, spherical particles (such as silica or titania) generated in situ by the sol-gel process and carbon nanotubes are typical examples of materials used as a nanosize reinforcing additive. Specific features of filled elastomers are discussed through the existing literature and through results of the author's research based on poly(dimethylsiloxane) filled with spherical silica or titania particles and on styrene–butadiene rubber filled with multiwall carbon nanotubes. The reinforcing ability of each type of filler is discussed in terms of morphology, state of dispersion (investigated by transmission electron microscopy, atomic force microscopy, small-angle neutron scattering), and mechanical and electrical properties. In addition, the use of molecular spectroscopies provides valuable information on the polymer–filler interface. Spherical silica and titania spherical particles are shown to exhibit two distinct morphologies, two different polymer–filler interfaces that influence the mechanical properties of the resulting materials. The superiority of carbon nanotubes over carbon black for mechanical reinforcement and electrical conduction is mainly attributed to their large aspect ratio rather than to strong polymer–filler interactions. The use of hybrid fillers (carbon nanotubes in addition to carbon black or silica, for example) has been shown to give promising results by promoting an enhancement of mechanical and electrical properties with regard to each single filler.

Enhanced mechanical and electrical properties of carbon fiber/poly(ether ether ketone) laminates via inserting carbon nanotubes interleaves

2019 ◽  
Vol 137 (19) ◽  
pp. 48658 ◽  
Author(s):  
Yanan Su ◽  
Fang Zhou ◽  
Xinghai Wei ◽  
Deqi Jing ◽  
Xinghua Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Carbon Fiber ◽  
Mechanical And Electrical Properties ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone

ENHANCEMENT OF MECHANICAL AND ELECTRICAL PROPERTIES OF EPOXY-BASED COMPOSITES FILLED WITH INTACT OR OXIDIZED CARBON NANOTUBES

2019 ◽  
Vol 10 (3) ◽  
pp. 241-251
Author(s):  
E. A. Yakovlev ◽  
N. Yakovlev ◽  
N. V. Gorshkov ◽  
T. Yudintseva ◽  
Igor Burmistrov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Mechanical And Electrical Properties ◽  
Oxidized Carbon ◽  
Oxidized Carbon Nanotubes

Mechanical and electrical properties of the epoxy composites with graphite nanoplatelets and carbon nanotubes

2013 ◽  
Vol 211 (2) ◽  
pp. 336-341 ◽  
Author(s):  
Ludmila Vovchenko ◽  
Oleksandra Lazarenko ◽  
Ludmila Matzui ◽  
Yulia Perets ◽  
Alexander Zhuravkov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Properties ◽  
Epoxy Composites ◽  
Graphite Nanoplatelets ◽  
Mechanical And Electrical Properties
Sign in / Sign up

Export Citation Format

Share Document