scholarly journals Carbon Nanostructures for Actuators: An Overview of Recent Developments

Actuators ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 46 ◽  
Author(s):  
Mauro Giorcelli ◽  
Mattia Bartoli
Keyword(s):  
Carbon Nanotubes ◽  
Material Science ◽  
Carbon Nanostructures ◽  
Carbon Materials ◽  
Cutting Edge ◽  
Main Role ◽  
Nanostructured Carbon ◽  
Intrinsic Properties ◽  
Recent Developments ◽  
Carbon Based

In recent decades, micro and nanoscale technologies have become cutting-edge frontiers in material science and device developments. This worldwide trend has induced further improvements in actuator production with enhanced performance. A main role has been played by nanostructured carbon-based materials, i.e., carbon nanotubes and graphene, due to their intrinsic properties and easy functionalization. Moreover, the nanoscale decoration of these materials has led to the design of doped and decorated carbon-based devices effectively used as actuators incorporating metals and metal-based structures. This review provides an overview and discussion of the overall process for producing AC actuators using nanostructured, doped, and decorated carbon materials. It highlights the differences and common aspects that make carbon materials one of the most promising resources in the field of actuators.

scholarly journals Carbon Nanosorbent for Purification Different Biomolecules

2011 ◽  
Vol 14 (1) ◽  
pp. 41
Author(s):  
Z.A. Mansurov ◽  
A.R. Kerimkulova ◽  
S.A. Ibragimova ◽  
E.Y. Gukenheimer
Keyword(s):  
Carbon Nanostructures ◽  
Large Scale ◽  
Carbon Materials ◽  
Raw Materials ◽  
Carbon Sorbent ◽  
Nanostructured Carbon ◽  
Lipid Complex ◽  
Carbon Sorbents ◽  
Physico Chemical ◽  
Chemical Studies

The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator. Carbon sorbents have well-developed porous structure but their disadvantage is the weak mechanical<br />strength. Recently it was shown that some carbon nanostructures have enormous strength. Thus arose the need to give the nano structured elements to carbon sorbent. Creating carbon sorbents containing nanocarbon structure was the aim of our study, as these by sorbents will be very useful for large-scale purification of biomolecules.

Investigations of dc electrical properties in electron-beam modified carbon nanotube films: single- and multiwalled

2005 ◽  
Vol 887 ◽  
Author(s):  
Sanju Gupta ◽  
N. D. Smith ◽  
R. J. Patel ◽  
R. E. Giedd
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Electron Beam ◽  
Physical Properties ◽  
Electron Beam Irradiation ◽  
Carbon Materials ◽  
Nanostructured Carbon ◽  
Beam Irradiation ◽  
Space Applications ◽  
The Family

ABSTRACTCarbon nanotubes (CNTs) in the family of nanostructured carbon materials are of great interest because of several unique physical properties. For space applications, it needs to be shown that CNTs are physically stable and structurally unaltered when subjected to irradiation becomes indispensable. The CNT films were grown by microwave Carbon nanotubes (CNTs) in the family of nanostructured carbon materials are of great interest because of several unique physical properties. For space applications, it needs to be shown that CNTs are physically stable and structurally unaltered when subjected to irradiation becomes indispensable. The CNT films were grown by microwave plasma-assisted chemical vapor deposition (MWCVD) technique using Fe as catalyst. Synthesis of both single- and multiwalled CNTs (SW and MW, respectively) were achieved by varying the thickness of the Fe catalyst layer. To investigate the influence of electron-beam irradiation, CNTs were subjected to low and/or medium energy electron-beam irradiation continuously for a few minutes to several hours. The CNT films prior to and post-irradiation were assessed in terms of their microscopic structure and physical properties to establish property-structure correlations. The characterization tools used to establish such correlations include scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Raman spectroscopy (RS), and current versus voltage (I-V) measuring contact resistance (two-probe) and dc conductivity (four-probe) properties. Dramatic improvement in the I-V properties for single-walled (from semiconducting to quasi-metallic) and relatively small but systematic behavior for multi-walled (from metallic to more metallic) with increasing irradiation hours is discussed in terms of critical role of defects. Alternatively, contact resistance of single-walled nanotubes decreased by two orders of magnitude on prolonged E-beam exposures. Moreover, these findings provided onset of saturation and damage/degradation in terms of both the electron beam energy and exposure times. Furthermore, these studies apparently brought out a contrasting comparison between mixed semiconducting/metallic (single-walled) and metallic (multiwalled) nanotubes in terms of their structural modifications due to electron-beam irradiation.

scholarly journals Carbon Nanostructures, Nanolayers, and Their Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2368
Author(s):  
Nikola Slepičková Slepičková Kasálková ◽  
Petr Slepička ◽  
Václav Švorčík
Keyword(s):  
Carbon Nanotubes ◽  
Electric Fields ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Carbon Materials ◽  
Biological Properties ◽  
Forms Of Carbon ◽  
The Right ◽  
Hybrid Carbon Materials ◽  
Walled Carbon Nanotubes

The versatility of the arrangement of C atoms with the formation of different allotropes and phases has led to the discovery of several new structures with unique properties. Carbon nanomaterials are currently very attractive nanomaterials due to their unique physical, chemical, and biological properties. One of these is the development of superconductivity, for example, in graphite intercalated superconductors, single-walled carbon nanotubes, B-doped diamond, etc. Not only various forms of carbon materials but also carbon-related materials have aroused extraordinary theoretical and experimental interest. Hybrid carbon materials are good candidates for high current densities at low applied electric fields due to their negative electron affinity. The right combination of two different nanostructures, CNF or carbon nanotubes and nanoparticles, has led to some very interesting sensors with applications in electrochemical biosensors, biomolecules, and pharmaceutical compounds. Carbon materials have a number of unique properties. In order to increase their potential application and applicability in different industries and under different conditions, they are often combined with other types of material (most often polymers or metals). The resulting composite materials have significantly improved properties.

EFFECTS OF HEAT TREATMENT ON SYNTHETIC GRAPHITES FOR CARBON NANOTUBES SYNTHESIS

2004 ◽  
Vol 03 (04n05) ◽  
pp. 671-675
Author(s):  
S. M. SANIP ◽  
Z. R. Z. ABIDIN ◽  
N. BUANG ◽  
M. AZIZ ◽  
A. F. ISMAIL
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Treatment ◽  
Carbon Materials ◽  
Gas Adsorption ◽  
Internal Surface ◽  
Absorption Capacity ◽  
Synthesis Methods ◽  
Internal Surface Area ◽  
Significant Research ◽  
Recent Developments

Carbon materials are well known for their excellent adsorbent property towards gases. Much work has been done to improve the properties of carbon materials as to enhance their absorption capacity towards gases. Recent developments have resulted in the discovery of novel carbon materials such as carbon nanotubes. Numerous researches have shown that carbon nanotubes have excellent capacity for hydrogen storage. However, significant research has been undertaken to further improve the adsorption capacity through the advancement in synthesis methods for the fabrication of carbon nanotubes. Among the starting material widely employed for synthesis of carbon nanotubes is high purity graphite. Therefore, purpose of this work is to investigate the effect of thermal treatment on several synthetic graphites. Thermal treatment was conducted at temperatures ranging from 400–800°C at different dwelling times. The morphology and surface analysis of the graphites were examined using Scanning Electron Microscope and nitrogen gas adsorption techniques, respectively. It was found that temperature, time and conditions of treatment significantly change the surface structure of the graphites. A decrease in particle size was observed due to the release of internal surface area.

Reversible Hydrogen Uptake in Carbon-Based Materials

1997 ◽  
Vol 497 ◽  
Author(s):  
S. D. M. Brown ◽  
G. Dresselhaus ◽  
M. S. Dresselhaus
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Materials ◽  
Hydrogen Uptake ◽  
Graphite Surface ◽  
Carbon Based

ABSTRACTSeveral approaches for achieving reversible hydrogen uptake by carbon are considered, including intercalation, adsorption by a graphite surface, hydrogenation of fullerenes, and the filling of carbon nanotubes. Most scenarios suggest that it is difficult to achieve an atomic uptake [H/C] ratio exceeding unity. Evidence for H2 uptake by various carbon materials is reviewed.

scholarly journals Quantum units from the topological engineering of molecular graphenoids

Science ◽  
2019 ◽  
Vol 366 (6469) ◽  
pp. 1107-1110 ◽  
Author(s):  
Federico Lombardi ◽  
Alessandro Lodi ◽  
Ji Ma ◽  
Junzhi Liu ◽  
Michael Slota ◽  
...  
Keyword(s):  
Environmental Effects ◽  
Carbon Nanostructures ◽  
Carbon Materials ◽  
Topological Defects ◽  
Spin Coherence ◽  
Atomic Precision ◽  
Coherent Behavior ◽  
Carbon Based ◽  
Graphene Nanostructures ◽  
Coherent Spin

Robustly coherent spin centers that can be integrated into devices are a key ingredient of quantum technologies. Vacancies in semiconductors are excellent candidates, and theory predicts that defects in conjugated carbon materials should also display long coherence times. However, the quantum performance of carbon nanostructures has remained stunted by an inability to alter the sp2-carbon lattice with atomic precision. Here, we demonstrate that topological tailoring leads to superior quantum performance in molecular graphene nanostructures. We unravel the decoherence mechanisms, quantify nuclear and environmental effects, and observe spin-coherence times that outclass most nanomaterials. These results validate long-standing assumptions on the coherent behavior of topological defects in graphene and open up the possibility of introducing controlled quantum-coherent centers in the upcoming generation of carbon-based optoelectronic, electronic, and bioactive systems.

scholarly journals Carbon nanostructure-based superhydrophobic surfaces and coatings

2021 ◽  
Vol 10 (1) ◽  
pp. 518-571
Author(s):  
Viswanathan S. Saji
Keyword(s):  
Carbon Nanotubes ◽  
Research And Development ◽  
Carbon Nanostructures ◽  
Graphitic Carbon ◽  
Superhydrophobic Surfaces ◽  
Nanostructured Carbon ◽  
Carbon Nanostructure ◽  
Oil Separation ◽  
Comprehensive Review ◽  
Carbon Soot

Abstract Research and development on superhydrophobic carbon nanostructures and their nanocomposites have high industrial significance. Here, a comprehensive review of the topic is provided. Reported works on superhydrophobic surfaces and coatings of carbon nanotubes, nanofibres, nanospheres/nanothorns/others, nanodiamond, fullerene and their various nanocomposites with metals, ceramics, and polymers are described. Superhydrophobic nanostructured carbon soot, graphitic carbon, and others are also presented. The section on superhydrophobic graphene is presented concisely at the end. Reports in different application areas, including anti-corrosion, anti-icing, oil separation, anti-biofouling, and sensors, are discussed separately. Superoleophobic and superamphiphobic surfaces are also discussed.

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