This document discusses carbon nanotubes (CNTs), including their discovery, structure, properties, synthesis, applications, and future potential. Some key points:
- CNTs were discovered in 1991 and have a rolled-up graphene sheet structure that gives them unique mechanical and electrical properties.
- CNTs exhibit extraordinary strength and conductivity, with current-carrying capacity 1000 times higher than copper.
- Common synthesis methods are arc discharge, laser ablation, and chemical vapor deposition.
- Applications include energy storage, conductive composites, electronics, and more. Mass production is increasing and CNTs are already used in some products.
- CNTs show promise for applications across many industries
It contains information about Carbon nanotubes which are extensively used in nanotechnology for various puposes. It discusses various types of CNTs along with the three main ways to synthesize them. The three main ways are Arc Discharge, Laser Ablation and Chemical Vapour Deposition. It also discusses various applications os CNTs and their properties.
It contains information about Carbon nanotubes which are extensively used in nanotechnology for various puposes. It discusses various types of CNTs along with the three main ways to synthesize them. The three main ways are Arc Discharge, Laser Ablation and Chemical Vapour Deposition. It also discusses various applications os CNTs and their properties.
Nano Material
Introduction and Synthesis
Nanomaterials describe, in principle, materials of which a single unit is sized (in at least one dimension) between 1 and 1000 nanometres (10−9 meter) but is usually 1—100 nm (the usual definition of nanoscale[1]).
Nanomaterials research takes a materials science-based approach to nanotechnology, leveraging advances in materials metrology and synthesis which have been developed in support of microfabrication research. Materials with structure at the nanoscale often have unique optical, electronic, or mechanical properties.
Nanomaterials are slowly becoming commercialized[2] and beginning to emerge as commodities.[3]
Nano Material
Introduction and Synthesis
Nanomaterials describe, in principle, materials of which a single unit is sized (in at least one dimension) between 1 and 1000 nanometres (10−9 meter) but is usually 1—100 nm (the usual definition of nanoscale[1]).
Nanomaterials research takes a materials science-based approach to nanotechnology, leveraging advances in materials metrology and synthesis which have been developed in support of microfabrication research. Materials with structure at the nanoscale often have unique optical, electronic, or mechanical properties.
Nanomaterials are slowly becoming commercialized[2] and beginning to emerge as commodities.[3]
Web & Mobile Application Development Company | Vensi, Inc.vensiinc
Vensi inc provides viable and scalable solutions by designing innovative and interactive applications across major platforms and devices, including iPhone, Android, Blackberry, iPad and Windows Mobile. Our highly specialized expert technical team with a multiple skillset diligently strives to ensure delivery of applications with high usability, scalability and uniqueness. Vensi is a prominent mobile solutions firm which specializes in the development of robust, integrated, cloud-based, voice and mobile solutions employing the creative use of leading-edge technology.
In this paper, I talk about three distinct areas: Big Data, Crowdsourcing, and Public Sector. Each of the these areas is vast on its own but through this paper I want to argue that it is the intersection of the three which offers unique and immense possibilities that can truly make the world a better place.
"Why do I serve?" This was a question that I thought I knew the answer to. However, after reading "What We Don't Talk About When We Don't Talk About Service" by Adam Davis, I felt that my answer wasn't enough. After reading about the reasons people serve listed by Davis, I wasn't sure if I fell into one of those categories, or if I was a bad person because I do fall into one of them. However, the article pushed me to really evaluate why I serve, and this Slideshare is how I interpreted my thoughts. I serve for many reasons, but one of them is because I identify strongly with the people I am serving. Although Davis's article discourages this reason, I believe that identifying with others has helped become a better and compassionate person of service.
App store optimization is the ability of vital promotion on mobile applications in any online mobile application store to increase the visibility of the app. It means the apps should be found when the users search with the specific keywords. This optimization will help to generate leads.
Carbon nanotube is an allotrope of carbon and it is widely used in many Research and Development companies. The presentation will help students to get some idea on this topic.
A significant nanoparticle discovery that came to light in 1991 was .pdfnipuns1983
A significant nanoparticle discovery that came to light in 1991 was carbon nanotubes. Where
buckyballs are round, nanotubes are cylinders that haven’t folded around to create a sphere.
Carbon nanotubes are composed of carbon atoms linked in hexagonal shapes, with each carbon
atom covalently bonded to three other carbon atoms. Carbon nanotubes have diameters as small
as 1 nm and lengths up to several centimeters. Although, like buckyballs, carbon nanotubes are
strong, they are not brittle. They can be bent, and when released, they will spring back to their
original shape.
The strongest, lightest and most conductive material known
Carbon nanotubes (CNTs) are tubular cylinders of carbon atoms that have extraordinary
mechanical, electrical, thermal, optical and chemical properties At the individual tube level,
these unique structures exhibit: 200X the strength and 5X the elasticity of steel; 5X the electrical
conductivity (\"ballistic transport\"), 15X the thermal conductivity and 1,000X the current
capacity of copper; at almost half the density of aluminum. As a carbon based product, CNTs
have almost none of of environmental or physical degradation issues common to
metals—thermal expansion and contraction, corrosion and sensitivity to radiation—all of which
result in greater system failure in performance-sensitive applications in aerospace and defense,
aviation, automotive, energy and consumer products.
CNTs typically have diameters ranging from ‹1 nanometer (nm) up to 50 nm—a nanometer is
one thousand millionth of a meter. Typical CNT lengths are several microns—several thousand
nanometers long; by contrast, Nanocomp\'s produced fibers are measured in
millimeters—thousands of times longer than all other commercially produced CNTs. In the
powdery format offered by all CNT producers (but for NTI), applications are limited to the
properties possible by this form factor—e.g. additive active ingredients in semiconductors, liquid
crystal displays (LCDs), sensors, and other uses in which these powders add some level of
functional performance.
Due to its fiber length and its form factors, NTI delivers strength and conductivity unlike any
other commercial CNT producer, and so can address a much broader array of applications for
which its material rivals copper and aluminum in conductivity, and steel, aluminum, carbon
fibers and glass composites where strength and lightweight matter. Further, the Company\'s
macro forms (sheets, tapes, conductors and yarns) are comprised of CNTs that are too long to be
inhaled or absorbed by the skin; for this reason, NTI believes it produces the safest CNT
commercial products on the market. NTI\'s sheets, tapes, conductors and yarn products have
been classified by the Environmental Protection Agency (EPA) as \"articles, \"not\" particles and
so--unlike all commercial producers of CNT particles--are not subject to more stringent oversight
as a potentially toxic or hazardous material.
. Wavelength Versus Physical Dimension.
The emergence of nanotechnology in th1980’s was caused by convergence of experimental advances such as the invention of the scanning tunneling microscope in 1981 and the discovery of fullerenes in 1985. Now the nanotechnology products are used in various fields such as medical, material science, automobile etc. In this topic the various applications of nanotechnology in the renewable energy sources exploitation have been discussed.
REPLACING COPPER WITH NEW CARBON NANOMATERIALS IN ELECTRICAL MACHINE WINDINGATHUL RAJ.R
This ppt is based on the following link article. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwj-hrvrw-nPAhWKvRoKHZW8B4AQFggcMAA&url=http%3A%2F%2Fwww.doria.fi%2Fbitstream%2Fhandle%2F10024%2F104337%2FReplacing%2520copper%2520with%2520new%2520carbon.pdf&usg=AFQjCNE9g0YA-Cnd1-Ru7mcc3OGixsh2-A&bvm=bv.136499718,d.d2s
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
1. Presented by
Ashesh Bansal
Guided By : Mr. Vipin Goyal
Department of Mechanical Engineering
Jaipur Engineering College And Research Centre , Jaipur
1
2. DISCOVERY …..
CNTs were discovered In 1991 by the
Japanese Electron Microscopist Sumio
Iijima Nec Laboratory in Tsukuba used
high-resolution Transmission Electron
Microscopy to observe carbon
nanotubes. Iijima's discovery of multi-
walled carbon nanotubes in 1991 and
Mintmire, Dunlap, and White's
independent prediction that if single-
walled carbon nanotubes could be
made, then they would exhibit
remarkable conducting properties
3. STRUCTURE
CNTs are allotropes of carbon.
Rolled- up graphene sheets.
Graphene is an individual
graphite layer.
The bonding in carbon
nanotubes is sp², with each
atom joined to three
neighbors, as in graphite.
4. This bonding structure,
which is stronger than the
sp3 bonds found in diamond,
provides the molecules
with their unique strength.
Under high pressure,
Nanotubes can merge
together, trading some
sp² bonds for sp³ bonds,
giving the possibility of
producing strong and
unlimited length wires
through high-pressure
nanotube linking.
5. CNTs (As per Wall structure)
Single walled Carbon
Nanotubes
Single layer
Bulk synthesis is difficult,
require proper control
High defects
Less pure Multi walled Carbon Nanotubes
Multi layers
Synthesis is easy
Defects are less
Very tough to remove defects
6. PROPERTIES OF CNTs
“Current-carrying capacity is 1000 times higher than that of
copper...” due to more electron than and metallic surface
Thermal stability and Reliability
CNT is thermal stable to 4000k.
Smart Sensors
Chemically active and highly sensitive
7. Mechanical Properties of Engineering Fibers
Fiber
Material
Specific
Density
E(TPa
)
Strength
(GPa)
Strain at
Break (%)
Carbon
Nanotubes
1.3-2 1 10-60 10
HS Steel 7.8 0.2 4.1 <10
Carbon
Fiber PAN
1.7-2 0.2-
0.6
1.7-5 0.3-2.4
Carbon
Fiber Pitch
2-2.2 0.4-
0.96
2.2-3.3 0.27-0.6
The strongest and most
flexible molecular
material because of CC
covalent bonding and
hexagonal network
architecture.
Strength to weight ratio
~500 times greater than
Al, steel, titanium.
CNT is as hard as
diamond and its
thermal capacity is
twice that of pure
diamond
8. Material Thermal Conductivity (W/m.k) Electrical
Conductivity
Carbon Nanotubes >3000 10^6-10^7
Copper 400 6*10^7
Carbon Fiber – Pitch 1000 2-8.5*10^6
Carbon Fiber – PAN 8-105 6.5-14*10^6
Electrical Properties:-
Symmetry and unique electronic structure of graphene, the
structure of a nanotube strongly affects its electrical
properties Very high current carrying capacity.
Thermal Conductivity :-
Measurements show that a SWNT has a room-temperature
thermal conductivity more than copper.
9. SYNTHESIS OF CNTs
Techniques have been developed to
produce nanotubes in sizeable quantities,
including
Arc discharge
Laser ablation
Chemical vapor deposition (CVD).
Most of these processes take place in
vacuum or with process gases. CVD growth
of CNTs can take place in vacuum or at
atmospheric pressure.
SWNTs and MWNTs are usually made by
carbon-arc discharge, laser ablation of
carbon, or chemical vapor deposition
(typically on catalytic particle).
10. ARC DISCHARGE
Two graphite electrodes are placed in inert
atmosphere.
Current is passed, anode is consumed and material
forms on cathode.
LASER ABLATION
A pulsed laser vaporize a graphite target in inert
atmosphere.
Nanotubes develop on the cooler surface of the
reactor.
Yielding is 70%.
CHEMICAL VAPOR DEPOSITION
A substrate is prepared with a layer of metal catalyst
article.
Heated up to 700°C
Two gases are blend into the reactor e.g. Nitrogen
and a carbon containing gas
11. ADVANTAGES
Extremely small and lightweight.
Resources required to produce them are plentiful, and
many can be made with only a small amount of material.
Are resistant to temperature changes, meaning they
function almost just as well in extreme cold as they do in
extreme heat.
Improves conductive, mechanical, and flame barrier
properties of plastics and composites.
Enables clean, bulk micromachining and assembly of
components
12. OBSTACLES
Difficulty of mass production for industrial
purposes.
Secondly is the solubility of CNTs in the
water.
Despite all the research, scientists still
don't understand exactly how they work.
Extremely small, so are difficult to work with.
Currently, the process is relatively expensive
to produce the nanotubes.
Would be expensive to implement this new
technology in and replace the older
technology in all the places that we could.
13. APPLICATIONS
Energy storage
Lithium batteries
Hydrogen storage
Paper battery
Strong Wires than steel.
Oscillators ,speeds of > 50 GHz.
Alternatives to traditional electrical
actuators
Could easily be mistaken for a sheet of black
paper
14. Solar storage
Reinforcement of armor and
other materials
SWNT films 90% transparency
Sheet resistivity of 100 ohmper
square
PETN (PantaErythritol TetraNitrate)
can be ignited with a camera flash.
15. Future of CNTs
Production Capacity increasing
Several producdts are already in the market, such as
racquets, golf clubs, surfboards, ice hockey sticks, mass
transportation fuel system components, battery electrode
additives, plastics additives and masterbatches.
More than 100 companies are
manufacturing CNT
The largest share of global CNTs
is accounted for by plastics and
composites with sales of $472.9
million in 2010
16. carbon nanotubes account for a 28% market share of
overall nanomaterials demand. In terms of production
capacity
The production capacity of CNTs has increased significantly
in the last five years
Only about 25% of the global CNTs production capacity was
produced in 2010
Average production at full capacity is estimated to be
about 40- 50% in 2016
Companies Producers include Arkema , Nanocyl, Showa
Denko , SouthWest NanoTechnologies, Inc.,Thomas Swan
and many more.
17. CONCLUSION
CNTs are nanometer-length shells of carbon.
Possess a combination of unique physical and chemical
properties.
Can be applied in a variety of fields.
Exhibits incredible strength, elasticity, thermal electrical
conductivity.
Pivotal element in Nano technology.
Can be applied to a variety of fields.
Technology is in its infancy and will take several years to
develop.
18. References
Chapin, D.M., C.S. Fuller, G.L. Pearson, (1954), A New Silicon
P-N Junction Photocell for Converting Solar Radiation into
Electrical Power, Journal of Applied Physics, 25:676-677.
Noguera, A.F., C. Longo, M.A. De Paoli, (2004), Polymers in
dye sensitized solar cell: overview and perspectives, Coord.
Chem. Rev. 248:1455.
Jing-Zhi Chen, Yin-Chen Yan and Kuan-Jiuh Lin, Effects of
Carbon Nanotubes on Dye-Sensitized Solar Cells, Journal of
the Chinese Chemical Society, 2010, 57, 1180-1184.
OngonTopon, Daisuke Matsumoto and Masayasu Inaguna,
Carbon Nanotubes Counter Electrode for Dye-Sensitized
Solar Cell, Fujikura Technical Review, 2011.
Gratzel, M., ‘Dye-Sensitized Solar Cells’, L. Photochem.
Photobio. C: Photochem. Reviews 4, 2003, pp. 145-153.