Materials CNT. Table of Contents Introduction Potential Applications Properties Functionalized CNTs...

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Materials CNT

Transcript of Materials CNT. Table of Contents Introduction Potential Applications Properties Functionalized CNTs...

Page 1: Materials CNT. Table of Contents Introduction Potential Applications Properties Functionalized CNTs Property Data for Specific Materials.

Materials CNT

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Table of Contents

• Introduction• Potential Applications• Properties• Functionalized CNTs• Property Data for Specific Materials

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Introduction

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Introduction

• Scientists have been trying to use the phenomenal mechanical properties of multiwalled carbon nanotubes (MWNT) to create high performance nanocomposites, since their discovery in 1991.

• The properties of the MWNT’s suggest that significant improvements should be added to the mechanical properties of the polymer matrix, which they reinforce.

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Introduction

• To alter the properties, strength, stiffness, permeability, optical clarity and electrical conductivity of the nanocomposites consistently two things need to occur: – the MWNT’s need to be dispersed

homogeneously throughout the matrix material, and there needs to be good interfacial bonding between the MWNT’s and the polymer matrix material.

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Introduction

• Strong bonding at the interface is required to transfer the load from the polymer material to the reinforcing MWNT .

• This can be achieved if the surface energy of the CNT exceeds the cohesive energy of the polymer matrix.

• Weak interfacial bonding will result in de-lamination giving instant mechanical failure.

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Introduction

• Weak interfacial bonding is a result of a non-wetting phenomenon between the CNT and polymer matrix, which is caused by the lack of functional groups on the CNT’s.

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Introduction

• There are two styles of polymer treatments for CNT’s:– wrapping and non-wrapping.

• Polymer wrapping means the treating polymer completely envelops the CNT surface.

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Introduction

• Non-wrapping polymer treatments are where the polymer backbone extends along the length of the CNT without any portion of the polymer treatment covering more than half of the diameter of the CNT.

• Non-wrapping polymer treatments contain a rigid backbone, which results in parallel stacking phenomena between the polymer and the CNT.

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Introduction

• The addition of treatments to the surface of the nanotubes is being researched and is intended to improve dispersion during processing, such as injection molding.

• These treatments consist of functionalizing the CNT by attaching polymeric chains to its surface.

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History• 1991 Discovery of multi-wall carbon nanotubes• 1992 Conductivity of carbon nanotubes• 1993 Structural rigidity of carbon nanotubes• 1993 Synthesis of single-wall nanotubes• 1995 Nanotubes as field emitters• 1996 Ropes of single-wall nanotubes• 1997 Quantum conductance of carbon nanotubes• 1997 Hydrogen storage in nanotubes• 1998 Chemical Vapor Deposition synthesis of aligned

nanotube films• 1998 Synthesis of nanotube peapods• 2000 Thermal conductivity of nanotubes• 2000 Macroscopically aligned nanotubes • 2001 Integration of carbon nanotubes for logic circuits• 2001 Intrinsic superconductivity of carbon nanotubes

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Potential Applications

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Potential Applications

• Reinforcement within a polymeric matrix• Outstanding mechanical properties

– High Young’s modulus– Stiffness and flexibility– Unique electronic properties– High thermal stability

• The nearly perfect structure of CNTs, their small diameter, and their high surface area and high aspect ratio, provide an amazing inorganic structure with unique properties extremely attractive to reinforcing organic polymers

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Potential Applications

• Tips for Atomic Force Microscopy• Cells for hydrogen storage• Nanotransistors• Electrodes for electromechemical applications• Sensors of biological molecules• Catalysts• Reinforcement of composite materials• Semiconductor or metallic conductive

nanomaterials• Various aerospace applications

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Potential Applications

• Flat Panel Displays– Prototypes have been made by Samsung

• Gas-Discharge Tubes in Telecom Networks• Energy Storage• Electrochemical Intercalation of Carbon

Nanotubes with Lithium– CNTs can be used as the cathode to make a

battery hold 3x as much charge and output 10x as much power

• Nanoprobes and Sensors

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Potential Applications

• Use as coatings– Antistatic coatings– Flame barrier coatings– Fouling release coatings

• On boats to prevent marine life from adhering to the ship’s bottom

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Potential Applications

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Potential Applications

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Potential Applications

BMC bicycle frame made of nanotube-reinforced resin,

2005 Tour de France. ARKEMA belongs to the network of partners.

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Properties

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Properties

• When small quantities of nanotubes are incorporated into the polymer, the electrical, optical and mechanical properties improve significantly

• CNTs in large amounts form clusters, diminishing their interaction

• The Young’s modulus of the multi-walled carbon nanotubes is 0 9 TPa⋅

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Properties

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Physical Properties of Carbon NanotubesBelow is a compilation of research results from scientists all over the world.

All values are for Single Wall Carbon Nanotubes (SWNT's) unless otherwise stated.     

Equilibrium Structure    Average Diameter of SWNT's   1.2 -1.4 nmDistance from opposite Carbon Atoms (Line 1)   2.83 ÅAnalogous Carbon Atom Separation (Line 2)   2.456 ÅParallel Carbon Bond Separation (Line 3)   2.45 ÅCarbon Bond Length (Line 4)   1.42 ÅC - C Tight Bonding Overlap Energy   ~ 2.5 eV

Group Symmetry (10, 10)   C5V

Lattice: Bundles of Ropes of Nanotubes  Triangular Lattice

(2D)Lattice Constant   17 ÅLattice Parameter:      (10, 10) Armchair 16.78 Å  (17, 0) Zigzag 16.52 Å  (12, 6) Chiral 16.52 ÅDensity:    

  (10, 10) Armchair 1.33 g/cm3

  (17, 0) Zigzag 1.34 g/cm3

  (12, 6) Chiral 1.40 g/cm3

Interlayer Spacing:      (n, n) Armchair 3.38 Å  (n, 0) Zigzag 3.41 Å  (2n, n) Chiral 3.39 Å.    

Optical Properties    Fundamental Gap:      For (n, m); n-m is divisible by 3 [Metallic] 0 eV

 For (n, m); n-m is not divisible by 3 [Semi-Conducting] ~ 0.5 eV

     Electrical Transport    Conductance Quantization   (12.9 k )-1

Resistivity   10-4 -cm

Maximum Current Density   1013 A/m2

.    

Thermal Transport    Thermal Conductivity   ~ 2000 W/m/KPhonon Mean Free Path   ~ 100 nmRelaxation Time   ~ 10-11 s.    

Elastic Behavior    Young's Modulus (SWNT)   ~ 1 TPaYoung's Modulus (MWNT)   1.28 TPaMaximum Tensile Strength   ~ 100 GPa

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Mechanical Properties of Engineering Fibers

Fiber Material Specific Density E (TPa) Strength (GPa) Strain at Break (%)Carbon Nanotube 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

E/S - glass 2.5 0.07 / 0.08 2.4 / 4.5 4.8

Kevlar* 49 1.4 0.13 3.6 - 4.1 2.8

Kevlar is a registered trademark of DuPont.

Properties

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Table 2. Transport Properties of Conductive Materials

Material Thermal Conductivity (W/m.k) Electrical ConductivityCarbon Nanotubes > 3000 106 - 107

Copper 400 6 x 107

Carbon Fiber - Pitch 1000 2 - 8.5 x 106

Carbon Fiber - PAN 8 - 105 6.5 - 14 x 106

Properties

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Properties

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Properties• Electrical conductivity:

Carbon nanotubes are conductors or semiconductors, based on coiling helicity. Their conductivity ranges from 1 S/cm to 100 S/cm. This property has been calculated and verified in experiments.

• Thermal conductivity:Carbon nanotubes feature thermal conductivity close to that of diamond (3000 J/K), the best thermal conductor known.

• Mechanical performance:In the hexagon plane, the Young’s modulus for carbon nanotubes has been theoretically evaluated at 1TPa. Together with this outstanding strength, carbon nanotubes boast high flexibility and good plasticity.

• Adsorption:

Nanotubes were first studied with the objective of becoming a means of storing hydrogen for the new fuel cells. Although this application has been gradually discarded, the fact remains that nanotubes have an empty space around the cylinder axis which can constitute a nanotank. The specific surface of nanotubes is approximately 250 m2/g, imparting good adsorption capacity.

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Properties

• CNTs have been shown to possess many extraordinary properties such as strength 16X that of stainless steel and with a thermal conductivity five times that of copper.

• aspect ratio (length over diameter) ranges from 1,000 to 1,000,000

• Electrical Resistivity: 10 -4 Ω-cm• Current Density: 107 amps/cm2

• Thermal Conductivity: 3,000 W/mK• Tensile Strength: 30 GPa• Elasticity: 1.28 TPa

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

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Properties

• Nanotube Research Articles\Overall\nanotube composites.pdf

• Very good article explaining the basics of CNT’s

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Properties

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Properties

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Filling CNTs

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CNT–Polymer Interfacial Strength

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Effects From Size

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Functionalized CNTs

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Additives• Additives can aid in the dispersion of the CNTs

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Functionalized CNTs

• Oxidation on the surfaces of these materials are useful moieties in order to bond new reactive chains that improve solubility, processability and compatibility with other materials and, therefore, improve the interfacial interactions of CNs with other substances

• The most important impact has been produced by oxidation methods which, in addition to reducing impurities, cause chemical modifications of CNTs

• The COOH groups generated in the oxidation process are used to attach different molecules useful to improve surface compatibility of CNTs with other materials

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Functionalized CNTs

• The COOH groups generated in the oxidation process are used to attach different molecules useful to improve surface compatibility of CNTs with other materials

• Chemical functionalization has reached an important position in the CNT field, as different chemical processes have been developed to diversify CNT properties

• The remarkable properties obtained when f-CNTs are incorporated into polymeric composites represent a promising route to design ideal materials for aerospace related structural applications

• However, the field requires much deeper fundamental research

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Functionalized CNTs

• Chemical functionalized CNTs significantly decreased the electrical conductivity of epoxy nanocomposites due to unbalance polarization effect and physical structure defects due to severe condition during acidic treatment process

• Non chemical functionalized CNTs are more suitable for the electrical applications

• Chemical functionalization of CNT is still necessary for increase dispersion quality and strengthens the interfacial bonding strength with polymer matrix, which more important in structural applications

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Functionalized CNTs

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Functionalized CNTs (Kentera)

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Functionalized CNTs (Kentera)

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Functionalized CNTs (Kentera)

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Functionalized CNTs (Kentera)

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Functionalized CNTs (Kentera)

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Functionalized CNTs (Kentera)

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Functionalized CNTs (Kentera)

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Adhesion and reinforcement in carbon nanotube polymer composite

• The interfacial shear stress is found to increase linearly with the applied strain in small strain regime and a lower bound value for the shear strength is found -- 46 MPa at low temperatures. Such value decreases with the increase of temperature. At large strains the interfacial bonds break successively with the shear stress decreasing in a staircase manner.

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Adhesion and reinforcement in carbon nanotube polymer composite

• The mechanical properties of the composite are found to be largely enhancedover a wide temperature range from 50 to 350 K compared with the bulk polymer, due to the enhanced VDW interactions. The degree of increase in the Young’s modulus is around 200% for the composite in this study, and the difference with that from the continuum medium approximation based Halpin–Tsai formula suggests that interfacial atomic structure is crucial for a nanocomposite.

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Adhesion and reinforcement in carbon nanotube polymer composite

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Property Data for Specific Materials

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PMMA

• Relative to pure PMMA, a 32% improvement in tensile modulus and a 28% increase in tensile strength were observed in PMMA-based nanocomposites using 1.0 wt% nanotube filler.

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Epoxy• no improvement in mechanical properties was

observed in epoxy-based nanocomposites.• The poorer mechanical performance of the

latter system can be explained by a decrease of the crosslinking density of the epoxy matrix in the nanocomposites, relative to pure epoxy.

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Epoxy

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Epoxy

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Epoxy

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Epoxy

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Natural Rubber

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Natural Rubber

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Natural Rubber

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PVA

• To summarize, MWNTs have been well dispersed in PVA matrix through gum arabic treatment. The PVA/MWNT composite films exhibit good mechanical properties

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PS

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PBT

• The addition of up to 0.2 wt% MWCNT to PBT induces an increase of the microhardness of about 12%. The H values obtained are much smaller than those derived from the elastic modulus using Struik’s relation. The use of SWCNT does not improve the micromechanical properties

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PBT

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SBR

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SBR

• The stress value or normally known as tensile strength has been increased to 21.0% for 1 wt% of CNTs up to 70.26% for 10 wt% of CNTs

• The Young’s modulus or modulus of elasticity has been increased to 11.36 for 1 wt% of CNTs up to 193.91% for 10 wt% of CNTs compared to SBR without CNTs.

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SBR

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PC

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PC

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PC

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PC

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PC

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PC

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PC

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PC

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PC

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PC

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PE

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PE

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PE

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PE

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PE

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PE

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PE

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PE

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PE

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PE

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LLDPE

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LLDPE

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LLDPE

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LLDPE

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LLDPE

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Microscope Imaging

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Microscope Imaging

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Microscope Imaging

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Microscope Imaging