The carbon network of the shells is closely related to the honeycomb arrangement of the carbon atoms. Numerical study on reinforcement mechanism of coppercarbon. Discoveries of very constant nanometer size sp 2 carbon bonded materials such as graphene, fullerenes, and carbon nanotubes have encouraged to make inquiries in this field. Catalytic oxidation of ptoluidine at multiwalled carbon nanotubes, m. Chemical vapor deposition cvd, a known method for nanotube growth, and electron beam ebeam, a new method which was used for the first time for the catalytic growth of carbon nanotubes. Arc discharge is the electrical breakdown of a gas to generate plasma. Metal coated functionalized singlewalled carbon nanotubes for composite applications by qiang zeng a thesis submitted in partial fulfillment of the requirements for the degree doctor of philosophy approved, thesis committee. Pdf as a new member of the carbon family, carbon nanotubes cnts have.
Research on carbon nanotubes and their growth has been carried out for applications in the semiconductor industry. In the second part of this thesis, we integrate nanotubes with supported lipid bilayers, mimic structures of cell membranes, and use this platform as a way to introduce biomolecules. The adsorption of methanol on both of these substances was tested for their application in a solar based refrigeration cycle. One of the best methods to prevent scale formation is by injecting polymeric scale inhibitors into the reservoir. If not prevented, the formation of scale can cause the blockage of rock pores or safety valves, leading to reduced well production. Evaluation of a new method to estimate the micropore. Graphene which is the basic structural element of carbon nanotubes is also discussed.
A slurry based process was developed to achieve the uniform dispersion of a high volume fraction of carbon nanotubes cnts in aluminum powder. Dispersion and performance properties of carbon nanotubes. This study is focused on predicting the mechanical behavior of reinforced polymer carbon nanotube nanocomposite blades. Calculating the band gaps of perfect carbon nanotube. Singlewalled carbon nanotubes lieber research group. Measurement of the electronic transport properties of carbon nanotubes is a very. Pages 122 2 catalytic synthesis of carbon nanotubes and nano.
Cnt are of high technological interest because they can be produced or refined to possess specific properties such as high. A thesis submitted in partial fulfillment of the requirements. Effects of multiwall carbon nanotubes on the mechanical properties of carbon reinforced cyanate ester composites by andres alvarez, b. Nanocomposites based on carbon nanotubes and poly 3. Finally, the energy gaps are calculated for each type of carbon nanotubes. Tomorrows society will be shaped by nanotube applications, just as siliconbased technologies dominate society today.
In the introductory chapters the physical properties of graphene, carbon nanotubes and functionalized carbon nanotubes will be presented, as well as relevant experimental investigation methods. The optimized condition of mwcnts sample has proven to be. Carbon nanotubes cnts have been under scientific investigation for more than fifteen years because of their unique properties that predestine them for many potential applications. This thesis is dedicated to myfamily, friends and teachers. Synthesis of carbon nanotubes fb physik, fu berlin.
A thesis submitted to the graduate council of texas state university in partial fulfillment of the requirements for the degree of master of science with a major in industrial technology december 2014. Carbon nanotubes cnts based polymer composites have variety of engineering applications electromagnetic shielding, antistatic coatings, highstrength lowdensity corrosionresistant components, lightweight energy storage and many more. Here we report the creation of a superhydrophobic surface via functionalization of vertically aligned carbon nanotubes with a. Synthesis and study of carbon nanotubes and carbon spheres sabelo dalton mhlanga student number. Tuning the band structure of carbon nanotubes ethan davis minot, ph.
The chamber consists of two electrodes which are mounted horizontally or vertically. These fascinating electromechanical and magnetic effects are quantified using. The volume certainly represents an excellent contribution to carbon based materials science. The field of nanotechnology and nanoscience push their investigation forward to produce cnts. Synthesis of carbon nanotubes and its applications. Graphite is made up of layers of carbon atoms arranged in a hexagonal lattice, like chicken wire see. Carbon nanotubes, which is one of the most attractive research subject for scientists, was synthesized by two different methods. Keywords carbon nanotubes, single and multiple walled nanotubes, nanomedicines. Modeling of carbon nanotube based mechanical sensors. Types, methods of preparation and applications parijat pandey, mandeep dahiya department of pharmaceutical sciences, maharshi dayanan d university, rohtak, har yana, india. Sangoi, ksv santhanam, international journal of nanoscience, vol 1 no.
Synthesis, integration, and properties hongjie dai department of chemistry, stanford university, stanford, california 94305 received january 23, 2002 abstract synthesis of carbon nanotubes by chemical vapor deposition over patterned catalyst arrays leads to nanotubes grown from specific sites on surfaces. These intriguing structures have sparked much excitement in recent years and a large amount of research has been dedicated to their understanding. Also, it is difficult to place and orient these novel substances. Carbon nanotubes are generally classified into single walled and multiwalled nanotubes.
This thesis seeks to investigate the adsorption capabilities of activated carbon and carbon nanotubes. In other words, the dos inside the cnt is limiting the amount of net. A schematic of an arc discharge chamber is shown in fig. Carbon nanofibers cnfs are discontinuous, highly graphitic, highly compatible with most polymer processing techniques, and they can be dispersed in an isotropic or anisotropic mode. Important mechanisms involve interfacial load transfer micromechanics, strain energy storage, and energy dissipation. The raman signal intensity for the sample increases with the incident laser power, providing detailed. An overview of the recent progress in the synthesis and. Carbon nanotubes are unique tubular structures of nanometer diameter and large lengthdiameter ratio. The electronic properties of multiwalled carbon nanotubes. Bharati vidyapeeths college of pharmacy, sec8, cbd belapur. Recent progress in the growth of freestanding narrowdiameter singlewalled carbon nanotubes cnts has demonstrated that this system can show exceptional fluorescence properties, including a strong optical dipole transition, single photon emission characteristics, and close to fourier limited linewidth even at elevated temperatures. We have fabricated devices out of carbon nanotubes and electrodeposited nanowires. Carbon nanotubes synthesis, structure, properties, and.
The present syn thesis approaches, however, limit the degree of complexity that can be controllably configured into these structures. I am sincerely indebted to my supervisor, associate professor lars jensen for his invaluable guidance and constant support during this thesis period. Pdf as a new member of the carbon family, carbon nanotubes cnts have exhibited great potentials in water treatment applications. Carbon nanotubes can be either singlewalled swnts, which are formed by only one single graphite layer, or multiwalled carbon. Cnts became a focus of attention of many scientists and companies.
They have high electrical and thermal conductivities and good optical properties. Despite the significant amount of research on carbon nanotubes, the thermal conductivity of individual. Qin nec corporation, fundamental research laboratories, tsukuba, ibaraki 305, japan reports of the synthesis and identi. Carbon nanotubes cnt belong to a large group of hollow fiberlike carbon based nanomaterials with diameters mostly below 100 nm and very high aspect ratios. Thesis study of adsorption of methanol in an activated. Carbon nanotubestabilized co9s8 dualshell hollow spheres. Carbon nanotube transistors, sensors, and beyond xinjian zhou, ph. Transport and adsorption properties of carboxylated carbon. The nanotubes may consist of one up to tens and hundreds of concentric shells of carbons with adjacent shells separation of 0. This account presents our uptodate research on controlling the growth of carbon nanotubes by cvd approaches. Electrons density of state for these cnts is calculated using the tight binding method. Introduction to carbon nanotubes carbon nanotubes were discovered in 1991 by sumio iijima of nec and are effectively long, thin cylinders of graphite, which you will be familiar with as the material in a pencil or as the basis of some lubricants. Carbon nanotubes were discovered by iijima in 1991. Work functions of functionalized singlewalled carbon.
Carbon nanotubes are remarkable objects that look set to revolutionize the technological landscape in the near future. Fabrication and characterization of carbon nanotubes for biomedical applications by zhiyang rong a thesis submitted to the faculty of the worcester polytechnic institute in partial fulfillment of the requirements for the degree of master of science in mechanical engineering august 2008 approved. As compared to a copper cable, the best cnt sample described in a recent. Nanostructures based on graphene and functionalized carbon. Carbon nanotubes cnts are seamless cylinders of one or more layers of graphene denoted singlewall, swnt, or multiwall, mwnt, with open or closed ends 1, 2. The carbon nanotube, a cylindrical tube of carbon atoms that is sized on the order of 109, has begun to pave the way towards carbon polymers that are lighter and stronger than ever before and have unique, valuable chemical and physical properties. Slanina, fullerens, nanotubes, and carbon nanostructures, vol. An approach to the uniform dispersion of a high volume. In the polymer nanocomposites cnts are dispersed in the polymeric matrix.
Scale formation in oil reservoirs is a primary challenge in the oil and gas industry. Carbon is the chemical element with atomic number 6 and has six electrons which occupy 1 s 2, 2 s 2, and 2p 2 atomic orbital. This dissertation presents and discusses in detail the above results. Thermal properties and nanoelectromechanical system based on carbon nanotubes thesis by hsinying chiu in partial fulfillment of the requirements for the degree of doctor of philosophy california institute of technology pasadena, california 2009 defended february 17, 2009. Carbon nanotube synthesis and growth mechanism intechopen. This can be achieved by using polymeric nanocomposite with the use of carbon nanotubes. This old technique of generating arc using electric current was first used to produce cnts by iijima in 1991. Work functions of functionalized singlewalled carbon nanotubes by janet ryu submitted to the department of materials science and engineering in partial fulfillment of the requirements for the degree of bachelors of science in materials science and engineering at the massachusetts institute of technology may 2006 c 2006 janet s. The chamber also contains a small amount of metal catalysts such as nickel, cobalt or iron. As a new member of the carbon family, carbon nanotubes cnts have exhibited great potentials in water treatment applications. I will delve into the challenges faced in the investigation of the above three topics and the answers i was able to give to them during my research.
Atomically, the structure of carbon nanotubes resembles that of a rolled up graphite sheets, with an inner diameter starting from 0. In this work, carbon nanotubecoated dualshell co9s8 hollow spheres are studied as anode materials for kion batteries. They have extremely high tensile strength and youngs modulus. The investigation of 1d nanocrystals confined in carbon nanotubes. Perfect cnts have all carbons bonded in a hexagonal lattice except at their ends, whereas defects in massproduced cnts introduce pentagons, heptagons, and other imperfections in the sidewalls that generally degrade. Department of laboratory medicine clinical research center carbon nanotubes in nanomedicine doctoral dissertation thesis for doctoral degree ph. Introduction carbon nanostructures like fullerenes, graphene and nanotubes are of great interest for the current research as well as for future industrial applications. Added to this, the ability to functionalize the surface of individual nanotubes can create synergistic effects in nanotube properties. I am submitting herewith a thesis written by yijing zheng entitled evaluation of a new method to estimate the micropore volume and external surface area of singlewalled carbon nanotubes. Ab initio study of carbon nanotube based conductors. The wide spectrum of key theoretical and experimental aspects is covered on 447 pages. Nonlinear vibrations of curved single and double walled carbon nanotubes submitted by hamed samandari in partial fulfillment of the requirements for the degree of doctor of philosophy in mechanical engineering department, middle east technical university by, prof dr.
Finally, at the nanometer scale, different physical properties emerge due to confinement effects and the large surfaceareato volume ratio. An approach to the uniform dispersion of a high volume fraction of carbon nanotubes in aluminum powder. Odom et alsinglewalled carbon nanotubes 205 dices determine whether a swnt will be a metal or a semiconductor. Cornell university 2008 carbon nanotubes are tiny hollow cylinders, made from a single graphene sheet, that possess many amazing properties. In particular, carbon nanotubes cnts and graphene nanoribbons. Cornell university 2004 the experiments presented in this thesis show that carbon nanotube nt electronic structure can be tuned by mechanical stretching and by magnetic fields. The unique hollow structure and carbon nanotubes synergistically enhance the conductivity and resolve the critical drawbacks of co9s8 electrodes, including large volume. Title of project paperresearch reportdissertationthesis this work. Figure 1 shows a schematic diagram of the experimental setup used for cnt growth by cvd method in its simplest form.