scholarly journals Mechanical and Electrical Properties of DNA Hydrogel-Based Composites Containing Self-Assembled Three-Dimensional Nanocircuits

2021 ◽  
Vol 11 (5) ◽  
pp. 2245
Author(s):  
Ming Gao ◽  
Abhichart Krissanaprasit ◽  
Austin Miles ◽  
Lilian C. Hsiao ◽  
Thomas H. LaBean
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Electrical Properties ◽  
Self Assembly ◽  
Three Dimensional ◽  
Mechanical And Electrical Properties ◽  
Dna Tiles ◽  
Dna Hydrogel ◽  
Conductive Nanomaterials ◽  
Dna Hydrogels

Molecular self-assembly of DNA has been developed as an effective construction strategy for building complex materials. Among them, DNA hydrogels are known for their simple fabrication process and their tunable properties. In this study, we have engineered, built, and characterized a variety of pure DNA hydrogels using DNA tile-based crosslinkers and different sizes of linear DNA spacers, as well as DNA hydrogel/nanomaterial composites using DNA/nanomaterial conjugates with carbon nanotubes and gold nanoparticles as crosslinkers. We demonstrate the ability of this system to self-assemble into three-dimensional percolating networks when carbon nanotubes and gold nanoparticles are incorporated into the DNA hydrogel. These hydrogel composites showed interesting non-linear electrical properties. We also demonstrate the tuning of rheological properties of hydrogel-based composites using different types of crosslinkers and spacers. The viscoelasticity of DNA hydrogels is shown to dramatically increase by the use of a combination of interlocking DNA tiles and DNA/carbon nanotube crosslinkers. Finally, we present measurements and discuss electrically conductive nanomaterials for applications in nanoelectronics.

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 Simulated Mechanical and Electrical Properties of Three-Dimensional Protein Lattices

2020 ◽  
Vol 118 (3) ◽  
pp. 479a
Author(s):  
Rachel Baarda ◽  
Simon Kit Sang Chu ◽  
Tegan Marianchuk ◽  
Daniel L. Cox
Keyword(s):  
Electrical Properties ◽  
Three Dimensional ◽  
Mechanical And Electrical Properties

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.

Size-tailored synthesis of gold nanoparticles and their facile deposition on AAO-templated carbon nanotubes via electrostatic self-assembly: Application to H2O2 detection

Carbon ◽  
2015 ◽  
Vol 94 ◽  
pp. 836-844 ◽  
Author(s):  
Panvika Pannopard ◽  
Chaiyan Boonyuen ◽  
Chompunuch Warakulwit ◽  
Yasuto Hoshikawa ◽  
Takashi Kyotani ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Self Assembly ◽  
H2o2 Detection ◽  
Templated Carbon

Contacting gold nanoparticles with carbon nanotubes by self-assembly

2005 ◽  
Vol 16 (8) ◽  
pp. 1123-1125 ◽  
Author(s):  
Tobias Smorodin ◽  
Udo Beierlein ◽  
Jörg P Kotthaus
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Self Assembly
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