Carbon Nano Tube

The choice of the appropriate catalysts for the nano carbon growth is one of the important conditions that assure the success of the synthesis and the control of the nano carbon structures. We achieved some researches on the theoretical basis of the different catalytic systems and obtained the catalysts that permit to reach the studied nano carbon products: CNT and CNF. The characterizations by the electronic microscopies SEM and TEM confirm the homogeneous structure of the obtained nano carbon products.

The liquid crystalline compositions are prepared by the in-situ polycondensation of diamines and diacid monomers in the presence of single wall carbon nano tubes (SWNT). Processing of the new compositions into fibers provide hybrid materials with improved mechanical properties. The in-situ polymerizations were carried out in polyphosphoric acid (PPA). Carbon nano tubes as high as 10 wt.polymer weight have been

Subthreshold circuits are an ideal choice for ultra low power, moderate throughput applications. In subthreshold region to meet the ultra-low power requirement of energy constrained devices, supply voltage less than the threshold voltage is applied. At same frequency, subthreshold circuits show orders of magnitude power saving over superthreshold circuits. In subthreshold operating region, minute leakage current is use as switching current but this limit the performance of logic gate. Primary goal while designing the subthreshold circuit is to increase the speed. Carbon Nano Tube Field Effect Transistors (CNFETs) is one of the most promising devices among emerging technologies. Most of the fundamental limitations of traditional MOSFETs are overcome in CNFETs. This paper investigates the performance analysis of subthreshold circuits and shown improvement in speed of logic gates using CNFETs. This paper primarily investigates the characteristics of CNFETs in subthreshold region. Improvement in performance of FO4, 1-bit full adder and 2:1 multiplexer is observed using CNFET over Si-MOSFET in subthreshold. This paper propose that reducing the gate oxide thickness of CNFET increases drive current and hence speeds with almost same amount of power dissipation.

The mechanical failure behavior of fiber reinforced polymer composites is extremely basic to the designing applications. The crack modes and failure modes of the components under strain must be completely comprehended with an end goal to understand the energy absorption capacity of such composites. The present study involved in the preparation of density graded E-glass fiber laminates (DGL) addition of multi walled carbon nano-tube by weight percentage and mechanical property evaluation of density graded FRP made of E-Glass fiber and polyester resin. The property evaluation involves tensile strength, flexural strength and Intra laminar strength. The obtained test results show that MWCNT content significantly affect the different properties of laminates. Tensile, and Flexural strength values of MWCNT content specimens show increasing trend compared to non MWCNT content specimens. Hence MWCNT content specimens show best results compared to non-MWCNT filler content ones. INTRODUCTION As glass fiber strengthened polymer composites (FRP) present expanding significance as load bearing parts in numerous applications [3], precise prediction of quality and failure behavior turns out to be important[4]. Size and density of the component are parameter in prediction of mechanical properties of composite part. As per literature, [2] strength of the FRP increases with increasing the fiber mat density, which also affects density and thickness of overall composite [5]. This weight to strength ratio and thickness to strength ratio effect can be minimized by fabrication of composites by density grading, which increases significance for the improvement of thin-laminate for fabricating composite components.

This paper investigates the radiation characteristics of a Vee dipole antenna operating in the near infra-red and optical frequency regimes. Antenna properties, such as far-field radiation patterns, coupling coefficient, measured by the scattering parameter S11, and directivity are provided. The resonance and directivity behavior of the optical Vee dipole, which is based on Multi-Wall Carbon Nano Tube (MWCNT), are investigated by varying the dipole length in order to exploit the effective operating frequency in the near infra-red range (~120 to 400 THz) and the visible light range (~400- 750 THz). Moreover, a parametric study aimed at optimizing the antenna directivity is performed by varying the angle between the two arms of the dipole using CST Microwave Studio simulation software which is based on the Finite Integration Technique (FIT). The proposed antenna achieved a directivity 3.767 dB higher than the traditional dipole in the visible regime while maintaining the same directivity in the near infrared regime.

Computational modeling can be a useful partner in biotechnology, in particular, in nanodevice engineering. Such modeling guides development through nanoscale views of biomolecules and devices not available through experimental imaging methods. We illustrate the role of computational modeling, mainly of molecular dynamics, through four case studies: development of silicon bionanodevices for single molecule electrical recording, development of carbon nano-tube-biomolecular systems as in vivo sensors, development of lipoprotein nanodiscs for assays of single membrane proteins, and engineering of oxygen tolerance into the enzyme hydrogenase for photosynthetic hydrogen gas production. The four case studies show how molecular dynamics approaches were adapted to the specific technical uses through (i) multi-scale extensions, (ii) fast quantum chemical force field evaluation, (iii) coarse graining, and (iv) novel sampling methods. The adapted molecular dynamics simulations provided key information on device behavior and revealed development opportunities, arguing that the "computational microscope" is an indispensable nanoengineering tool.

High speed Full-Adder (FA) module is a critical element in designing high performance arithmetic circuits. In this paper, we propose a new high speed multiple-valued logic FA module. The proposed FA is constructed by 14 transistors and 3 capacitors, using carbon nano-tube field effect transistor (CNFET) technology. Furthermore, our proposed technique has been examined in different voltages (i.e., 0.65v and 0.9v). The observed results reveal power consumption and power delay product (PDP) improvements compared to existing FA counterparts

The rubber materials is very important materials its using in large engineering
application, therefore, the modified for mechanical properties and behavior for its
materials investigation form many researchers. But, more researchers were focused
on the investigation for properties
compound adding in composition of the rubber material. But, this processing given
modifying for properties and behavior did not exceed
previous my paper presented
particle materials shown that the mechanical properties and behavior increasing
high value lead to about (60%)
investigation the modified for mechanical properties and
materials by reinforcement with carbon multi wall Nano particle materials. Where,
the investigation include evaluated the mechanical properties (strength for rubber)
and mechanical creep behavior
materials. There, the study was achieved through experimental technique by
manufacturing multi rubber samples with different Nano particle weight fraction, and
then, test its samples by ten
and behavior for its materials

0, 0.2, 0.4, 0.6, 0.8,
 1
numerically by using finite element technique with using Ansys package, and then,
comparison the results evaluated together with experimental calculated
Where, the comparison shown that the maximum error not exceed (8.36%).
the investigation shown that the mechan
materials modified to about (65%) with reinforcement by
carbon Nano materia

Here, we report the study of growth of CNTs using pulsed DC Plasma Enhanced Chemical Deposition (PECVD) process. Pulsed DC PECVD is employed as it provides enhanced control on arcing and uniformity over large area and thus control on length, diameter and positioning of CNTs. High yields of Multi-Walled Carbon nanotubes with diameters ranging from 40 to 100 nanometers are synthesized by plasma enhanced chemical Vapour deposition system. A layer of Titanium (50 nm) is used as buffer layer and a layer of Nickel (~10 nm) is used as catalyst layer. Effect of Temperature, growth pressure and acetylene (C2H2) concentration on the synthesis of CNTs is studied. CNTs are characterized by Secondary Electron Microscopy (SEM) and Raman spectroscopy. Uniform CNTs growth observed at growth temperature 700°C and 800°C .Raman spectroscopy of CNTs shows that the strength of D-band (Defect-induced band) relative to G-band (Graphite-related optical band) decreases as the growth temperature increases which indicates the crystalline, defects free, uniform diameter and length of aligned CNTs. From temperature 700°C to 800°C, Up-shift in D-band indicates the increase in diameter of CNTs while up-shift in G-band may because of chemical doping in tubes. Downshift in G-band.

The rubber materials is very important materials its using in large engineering
application, therefore, the modified for mechanical properties and behavior for its
materials investigation form many researchers. But, more researchers were focused
on the investigation for properties
compound adding in composition of the rubber material. But, this processing given
modifying for properties and behavior did not exceed
previous my paper presented
particle materials shown that the mechanical properties and behavior increasing
high value lead to about (60%)
investigation the modified for mechanical properties and
materials by reinforcement with carbon multi wall Nano particle materials. Where,
the investigation include evaluated the mechanical properties (strength for rubber)
and mechanical creep behavior
materials. There, the study was achieved through experimental technique by
manufacturing multi rubber samples with different Nano particle weight fraction, and
then, test its samples by ten
and behavior for its materials

0, 0.2, 0.4, 0.6, 0.8,
 1
numerically by using finite element technique with using Ansys package, and then,
comparison the results evaluated together with experimental calculated
Where, the comparison shown that the maximum error not exceed (8.36%).
the investigation shown that the mechan
materials modified to about (65%) with reinforcement by
carbon Nano material

The rubber materials is very important materials its using in large engineering
application, therefore, the modified for mechanical properties and behavior for its
materials investigation fonmi many researchers. But, more researchers were focused
on the investigation for properties of its materials by variable the amount for each
compound adding in composition of (lie rubber material. But, this processing given
modifying for properties and behavior did not exceed about (20%). Therefore, from
previous mv paper presented fbr mod jfied materials by reinforcement with Nano
particle materials shown that the mechanical properties and behavior increasing with
high value lead to about (60%), as in composite materials. Then, in this paper,
investigation the modified for mechanical properties and creep behavior for rubber
materials by reinfbrcement with carbon ,nulti wall Nano particle materials. Where,
the investigation include evaluated the mechanical properties (strength for rubber)
and mechanical creep behavior with various weight fraction effect for Nano particle
materials. There, the study was achieved through experimental technique by
mnanufticturing multi rubber samples with dijferent Nano particle weight fraction, and
then, test its samples by tensile and creep machines to evaluate mechanical properties
and behavior fbr its materials. There, the weight fraction for Nano particle used are
(0, 0.2, 0.4, 0.6, 0.8, and 1% wt). In addition, the creep behavior investigation
numerically by using finite element technique with using Ansvs package, and then,
comparison the results evaluated together with experimental calculated results.
Where, the comparison shown that the ,nLiimuin error not exceed (8.36%). Finally,
the investigation shown that the mechanical properties amid creep behavior for rubber
materials modified to about (65%) with reinforcement by (1 %wt) for multi wall
carbon Nano materiaL

The rubber materials is very important materials its using in large engineering
application, therefore, the modified for mechanical properties and behavior for its
materials investigation Jrni many researchers. But, more researchers were focused
on the investlgation for properties of its materials by variable the amount for each
compound adding iii composition of the rubber material. But, this processing given
modifying for properties and behavior did not exceed about (20%). Therefore, from
previous mv paper presented for inodfied materials by reinforcement wit!? Nano
particle materials shown that the mechanical properties and behavior increasing wit/i
high value lead to about (60%), US in composite materials. Themi, in this paper,
investigation the modified for mechanical properties and creep behavior for rubber
materials by reinforcement with carbomi inuit i wall Nano particle materials. Where,
the investigation include evaluated the mechanical properties (strength for nibber)
and mechanical creep behavior with various weight fraction effect for Nano particle
materials. There, the study was achieved through experimental technique by
manufacturing multi rubber samples with dijferent Nano particle weight fraction, and
then, test its samples by tensile and creep machines to evaluate mechanical properties
and behavior for its materials. There, the weight fraction for Nano particle iise1 (ire
(0, 0.2, 0.4, 0.6, 0.8, and 1% wt). In addition, the creep behavior investigation
numerically by using finite element technique with using Ansvs package, and themi,
comparison the results evaluated together with experimental calculated results.
lVhere the comparison shown that tile mnavimumn error not exceed (8.36%). Finally,
the investigation shown that the mechanical properties amid creep behavior for nibber
materials modified to about (65%) with reinforcement by (l%wl) for multi wall
carbon Nano material.

Metamaterials are composites consisting of artificial meta-atoms/metamolecules with typical sizes less than the wavelength of operation. One of the key properties that makes metamaterials distinctly different form the natural media is a very strong magnetic response that can be engineered in the visible and infra-red part of the spectrum. In this work we summarize our multipole expansion approach that can be used to describe analytically optical properties of metamaterials composed of, in particular, the split-ring ...

Nano technology is emerging as the latest technology these days. It is proving its importance in every sphere of life. Metal carbon nano tube due to their vast applications is being used very frequently. So to prepare CNTs a new method is developed. In this methods Complexes ...

Sea bed logging is a new technology being implemented for deep target exploration. In seabed logging, the magnitude of electromagnetic (EM) wave for detection of hydrocarbon reservoir is very important and still remained challenge. New Al transmitter with (Y3Fe5O12 with and without MWCNTs) magnetic feeders was used in a marine scaled tank to enhance the magnetic field strength. Experiments were done in marine lab scale tank to replicate the real seabed environment. Y3Fe5O12 with and with out multiwall carbon nano tubes (MWCNTs) were synthesized by using sol gel-self combustion hybrid method. Samples were sintered at 550°C, 750°C and 1050°C to get the required characteristics of the garnet nanoparticles. Y3Fe5O12 samples with and without MWCNTs were characterized by using XRD, RAMAN, FESEM and Impedance network analyzer. X-ray diffraction results revealed that the best Y3Fe5O12 phase was appeared at the sintering temperature of 1050°C. Nanoparticles sizes ranging from 70 to 110 nm were obtained by using sol gel-self combustion hybrid method. Raman results also demonstrate the confirmation of garnet structure of Y3Fe5O12 at sintering temperature of 1050°C. Field emission scanning electron microscopy (FESEM) was used to see the morphology of Y3Fe5O12 with and with out MWCNTs composites. Magnetic characterization results illustrates that Y3Fe5O12 with MWCNTs at 1050°C has higher Initial permeability (33.302) and high Q-factor (55.104), where as low loss factor (0.0003) was also investigated for Y3Fe5O12 — MWCNTs composites. It was observed that by using Y3Fe5O12-MWCNTs polymer composites toroid as magnetic feeders resulted 210% increase in magnetic field strength.