Industrialization of boron nitride nanotubes: Synthesis, chemistry, assemblies and composites
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1 Nano-Israel 2016 February 22-23, 2016, Tel Aviv Industrialization of boron nitride nanotubes: Synthesis, chemistry, assemblies and composites Dr. Benoit Simard Principal Research Officer and Group Leader, Nanocomposites Security and Disruptive Technologies Portfolio Division of Emerging Technologies
2 (since 1999) Synthesis of SWCNTs & BNNTs CNT assemblies (sheets, films, fibers) Composite materials Polymers Metals Ceramics Inks 700 g of SWCNT 30 cm 2
3 Boron Nitride Nanotubes (BNNTs) Blue=boron Pink=nitrogen Theoretically proposed in 1994, and first synthesized in 1995 Rolling up a hexagonal BN monolayer composed of alternating B and N Structurally similar to CNTs, thus mechanical properties as compelling as those of CNTs Other distinct physical and chemical properties, such as large band gaps, piezoelectricity, neutron adsorption, etc.. 3
4 Nanotubes: Carbon and Boron Nitride Potential composites advantages of BNNTs: e.g., High-temperature composites Transparent composites Thermally conductive insulators Radiation shielding Piezoelectrics Flame resistance 4
5 BNNTs Synthesis Methods Low temperature routes (< 2,000 K) High temperature routes (>4,000 K) Chemical vapor depositions (CVD) Floating catalysts CVDs Ball milling & annealing Carbothermal reactions Arc discharges Laser vaporizations Plasma jets Zhi et al., Solid Stat. Comm., 135, 67 (2005) 2B+ N 2 2BN Arenal et al., JACS, 129, (2007) 5
6 Pilot-Scale BNNT Synthesis: Induction Thermal Plasma Atmospheric pressure Yield rate: > 25 g/h BNNT type: few-walled BNNT diameter: < 10 nm Hydrogen is essential. No metal catalyst is needed! 6 Kim et al., US#61/813,324 (2013) Kim et al, ACS Nano 8, 6211 (2014)
7 Towards Industrialization of BNNTs Literature: first synthesis reported in 1995, sub-gram yields are typical Lack of availability previously limited development (Until now!) Last year, NRC reported pilot-scale production of high-quality, small diameter BNNTs Accessibility of multigram-to-kg quantity new opportunities for composites kg quantities of high-purity and highly crystalline BNNTs are now accessible for the first time! -Kim et al (ACS Nano, 2014) Available from SIGMA-ALDRICH: Patent appl.: Kim et al., US#61/813,324 (2013) Kim et al, ACS Nano 8, 6211 (2014)
8 Large-scale Synthesis of BNNT (>20 g/h): Raw Materials 8 Kim et al, ACS Nano 8, 6211 (2014)
9 9 Development of BNNT Engineering Materials
10 Valence electron density distributions Shin et al., ACS Nano, 9, (2015). (6,6) CNT Charge density is equally distributed around C atoms Strong covalent C-C bonds Delocalized π electrons (6,6) BNNT δ- 10 δ+ Valence charges are concentrated around the N atoms Electronegativigy of B (2.04) and N (3.04) Æ partial charges±0.2~0.5e Mixed covalent-ionic bonding characteristics
11 Chemistry of reduced BNNT-Computational studies Shin et al., ACS Nano, 9, (2015). ρ=-1/60 (e/atom) 11 1) Upon reduction, BNNTs drastically improve their binding affinity toward radical molecules, due to the extra electron localization 2) The reduction of CNTs only moderately increases their binding affinities with radical molecules 3) No significant changes for non-radical molecules, such as ammonia
12 Chemistry of reduced BNNT-Experimental studies Shin et al., ACS Nano, 9, (2015).
13 Thermoset Nanocomposites with Dispersed BNNTs Filler: as produced BNNTs Matrix: EPON 828 Epoxy Transmission Optical Images Neat epoxy BNNT-epoxy (1wt%) CNT-epoxy (1wt%) Planetary Centrifugal Mixer (solvent-free) Integration by planetary mixing (solvent-free) Small viscosity increase (up to 2 wt%), c.f., large increase with small-diameter MWCNTs Potential for transparent coatings and composites 13
14 High BNNT content composites: Epoxy-impregnated buckypaper (30 wt.% BNNTs) Wicking 20 s MY0510- epoxy/bnnt Epoxy Contact Angle BNNT BP < 60 CNT BP > 100 BNNT BP - epoxy epoxy Dry BPs (CNT, BNNT) Partially transparent (60 μm thick) Better interaction between BNNT and resin than CNT (wicking, contact angle) Young s modulus: over 2x neat epoxy and 20x unimpregnated BP Encouraging thermal conductivity results Kim et al, RSC Advances, 5, (2015)
15 Polyurethane-Modified Buckypaper Composites A TPU in THF BP Infiltration Characteristics of BNNT/TPU buckypapers Sample Method BNNT:TPU (wt. ratio) Density (g/cm 3 ) B TPU/Nanotube suspension BNNT/TPU 80:20 (wt. ratio) One-step Filtration Method B BNNT/TPU 40:60 (wt. ratio) BNNT 100: BN80PU20 A 80: BN90PU10 B 90: BN80PU20 B 80: BN60PU40 B 40: Low-density, porous nanotubenetwork morphology can be retained intermediate step to other composite fabrication 15 Kim et al, RSC Advances 5, (2015) The one-step filtration method enabled control of the TPU content tailor properties from buckypaperlike to PU-like Confidential
16 Summary on BNNT Small-diameter BNNTs synthesized at high purity and high yield by thermal plasma technology. Largest production capacity for BNNTs; Technology now in industry hands. Enabling technology for development of BNNT composites and other large scale applications. Dispersed BNNT composites: easier dispersion than CNTs (better CNTepoxy interaction for materials tested), transparent coatings, electrical insulating equivalent of CNTs for joint enhancement. Dramatic increase in thermal stability (+50 o C) in PC and T g (+40 o C) in epoxy. BNNT buckypaper: easy handling, high wt.% BNNT nanocomposites; potential for structural & multifunctional composites. Multifunctional materials opportunities, including in combination with CNT (complimentary properties) and other nanomaterials. 16
17 Acknowledgements NanoComposites NRC Canada NRC Collaborators: Dr. A. Johnston, Dr. B. Ashrafi, Dr. M. Rahmat, Dr. S. Derdouri, Dr. D. Bouchard, Dr C. Cojocaru, M. Harrison, T. Kay, R. Desnoyers 17 Michael Barnes Clinton Bond Fuyong Cheng Malgosia Daroszewska Stephane Denommee Danielle Dinsdale Jingwen Guan Christa Homenick Robyn Iannitto Michael Jakubinek Chris Kingston Shuqiong Lin Yadienka Martinez Rubi Mark Plunkett Steven Walker Benoit Simard
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