Nanofibers of aluminum oxidephysical propertiesJanuary 2013
Nafen™ is a new material on the market:alumina nanofibers in gamma / chi phase Parameter ...
GEOMETRY AND MORPHOLOGY
TEM micrographs / National University of Science andTechnology MISiS (Moscow, Russia) TEM images demonstrate fine f...
Two types of Nafen fibers are currently produced:with average diameters of 7-10 and 30-40 nm TEM and fiber dia...
Nafen is produced in blocks of co-aligned fibers Fibers are co-aligned and arranged in bundles - distance between fibers i...
ELEMENTAL AND PHASE ANALYSIS
Elemental analysis (EDX) at various temperatures and TGA / UCambridge (UK)Elemental Analysis Elemental Analy...
Phase analysis (XRD) / IC SB RAS (Novosibirsk,Russia) Typical diffraction patte...
High-temperature phase transformation (XRD) / PANanalyticalemperature XRD ...
SURFACE PROPERTIES
нию d=4/ρA. Для значения плотности 3.89г/см BET specific surface area / БЭТ 155 м2/г, а d=6.6 нм. 3 и удельной пов...
(Рис.3.4Б), т.е. есть и зубцы, и плоские участки поверхности. Угол 120о характерен для The surface is ‘saw-shaped’,...
APPENDIX: XRD’s OF DIFFERENT SAMPLES
Phase analysis (XRD) / PANanalyticalSample 1 - Identification 14
XRD Position 1 s/ Bruker White fibers - position 1 ...
XRD Position 2 / Bruker 16
XRD Position 3 / Bruker Peaks are sharper and it seems that there is some preferred orientation (intensi...
APPENDIX: PORE SIZE DISTRIBUTION
наблюдаются максимумы /г,при 20 нм (по десорбции) и 40 нм (по адсорбц и удельной поверхности по БЭТ 155 м а d=6.6 нм. P...
of 20

Nafen Generic Technical Presentation

NAFEN™ - THE REVOLUTIONARY MATERIAL AT THE HEART OF A NEW TECHNOLOGICAL FUTURE Aluminum Oxide Nano fibers - NAFEN™ provides the unique combination of properties including controllable diameter of 7 and 40 nm, lengths up to 15 centimeters, Young’s modulus over 400 GPa, a vast surface area of over 150 m2/g, high aspect ratios, chemical inertness, stability against radiation, and thermal stability up to 1200 C. All of these amazing attributes are represented in NAFEN™, which ANF Technology produces in industrial volumes -- with unlimited scale-up potential -- to meet the growing market demand for these innovative nano products. NAFEN™ IS THE ONLY SUPERIOR-QUALITY NANOFIBER ON THE MARKET PRODUCED IN INDUSTRIAL VOLUMES
Published on: Mar 3, 2016
Source: www.slideshare.net


Transcripts - Nafen Generic Technical Presentation

  • 1. Nanofibers of aluminum oxidephysical propertiesJanuary 2013
  • 2. Nafen™ is a new material on the market:alumina nanofibers in gamma / chi phase Parameter value Phase gamma / chi Mean fiber diameter, nm 7-10 / 30-40 Fiber length, mm 1–150 Specific surface area (BET), m2/g 155 Purity, % 99.7 Specific gravity, g/cm3 3.98 Bulk density, g/cm3 0.1 to 0.4 Nafen is unique because of its industrial-scale production technology. It is synthesized from liquid aluminum melt which ensures continuous production rate over 0.5 kg/hour even at pilot stage. 1
  • 3. GEOMETRY AND MORPHOLOGY
  • 4. TEM micrographs / National University of Science andTechnology MISiS (Moscow, Russia) TEM images demonstrate fine fiber diameter and length-to-diameter ratio 3
  • 5. Two types of Nafen fibers are currently produced:with average diameters of 7-10 and 30-40 nm TEM and fiber diameter distribution for the two types of fibers 8 nm average diameter 35 nm average diameter 4
  • 6. Nafen is produced in blocks of co-aligned fibers Fibers are co-aligned and arranged in bundles - distance between fibers in block is 20 to 40 nm - block size is up to 50x50 cm - block height is up to 15 cm (along the fibers) - bulk density is 0.1 to 0.4 g/cm3 - block thermal conductivity is 0.025 W/m•K, close to that of air - fibers are easily separated by wetting in water or alcohols W-20SEM 5
  • 7. ELEMENTAL AND PHASE ANALYSIS
  • 8. Elemental analysis (EDX) at various temperatures and TGA / UCambridge (UK)Elemental Analysis Elemental Analysis 37:63 44:5637:63 46:54 46:54 45:5546:54 46:54 45:55 Saffil GreyNafen 7 nm to white Nafen 12 nm Grey to white T, C 20 1000 1270 1400 Al to O weight ratio is close to Al2O3 The material loses up to 10% weight when heated - Al2O3 corresponds to 48:54 - due to water desorption - deviation at low temperature is due to - Saffil is shown as a reference alumina material water adsorption - small deviation at high temperature is due to vacant Al bonds on the surface 7
  • 9. Phase analysis (XRD) / IC SB RAS (Novosibirsk,Russia) Typical diffraction patterns for low- temperature phases of alumina - gamma and etha are cubic spinels - chi is also cubic, but with additional hexagonal packing (check term) - chi is identified by the peak at 42.8 Diffraction patterns of two samples of Nafen - the phase is identified as mostly chi for these particular samples, with some gamma - different samples have varying gamma/chi ratio, depending on the synthesis process parameters - crystallite size 50-100 nm Nafen fibers are polycrystalline alumina in gamma and chi phases 8
  • 10. High-temperature phase transformation (XRD) / PANanalyticalemperature XRD At 1200–1400 C, transformation to alpha phase occurs Series of XRD spectra during samples heating 10 9
  • 11. SURFACE PROPERTIES
  • 12. нию d=4/ρA. Для значения плотности 3.89г/см BET specific surface area / БЭТ 155 м2/г, а d=6.6 нм. 3 и удельной поверхности по IC SB RAS, а d=6.6 нм. (Novosibirsk, Russia) Nitrogen adsorption-desorption method (BET) adsorption cm3/g desorptionции азота образца 29/11 при 77К. P/P0 7 Specific surface area is measured at 155 cm2/g - this corresponds to the geometric surface Рис. 2.2. Изотермы адсорбции-десорбции азота образца - hence, no micropores or surface defects 29/11 при 77К. 11
  • 13. (Рис.3.4Б), т.е. есть и зубцы, и плоские участки поверхности. Угол 120о характерен для The surface is ‘saw-shaped’, faceted at various плоскостей плотнейшей упаковки атомов кислорода (111). Напомним, что для angles (TEM) / IC SB RAN (Novosibirsk, Russia) традиционного c-Al O , полученного прокаливанием гиббсита, характерна 2 3 пластинчатая форма кристаллитов с развитой гранью 111.ционные картины образцов 29/11 и 22.гласно микроскопии высокого разрешения волокнаубцов равен 120о) (Рис.3.4А), либо перекрученыие участки поверхности. Угол 120о характерен для атомов кислорода (111). Напомним, что длянного прокаливанием гиббсита, характернаразвитой гранью 111. А Б Рис.3.4А. Волокно, зубчатые края, угол 120о (вид сверху на плоскость (111)). Рис.3.4Б. Перекрученное волокно. Одна часть с зубчатыми краями (вид сверху на плоскость (111), вторая с ровными краями (вид сбоку на упаковку полоскостей (111))[111] 11 А Б ол 120о (вид сверху на плоскость (111)).дна часть с зубчатыми краями (вид сверху на Рис. 5.8. Ориентация фасеток увеличенного размера (5 нм и более). 12
  • 14. APPENDIX: XRD’s OF DIFFERENT SAMPLES
  • 15. Phase analysis (XRD) / PANanalyticalSample 1 - Identification 14
  • 16. XRD Position 1 s/ Bruker White fibers - position 1 1700 1600 1500 1400 1300 1200 1100 Lin (Counts) 1000 900 800 700 600 500 400 300 200 100 0 10 20 30 40 50 60 70 80 90 2-Theta - Scale File: LC-polycap-2mm Coli-sample white-position1.raw 00-050-0741 (I) - Aluminum Oxide - Al2O3 - Cubic - a 7.93900 - c 7.93900 - Face-centered - Fd-3m (227) 00-046-1131 (N) - Aluminum Oxide - Al2O3 - Tetragonal - a 5.59900 - c 23.65700 - Prim itive - P-4m2 (115) Bruker 21.09.10 15
  • 17. XRD Position 2 / Bruker 16
  • 18. XRD Position 3 / Bruker Peaks are sharper and it seems that there is some preferred orientation (intensity ratio does not fit anymore to the expected one). 17
  • 19. APPENDIX: PORE SIZE DISTRIBUTION
  • 20. наблюдаются максимумы /г,при 20 нм (по десорбции) и 40 нм (по адсорбц и удельной поверхности по БЭТ 155 м а d=6.6 нм. Pore size distribution / IC SB RAS (Novosibirsk,видимому, соответствующие порам между волокнами. Russia) dV/dD cm3/g nm adsorption desorption Рис. 2.2. Изотермы адсорбции-десорбции азота образца 29/11 при 77К. Pore diameter D, nm 7 Рис. 2.3. Распределение объѐма пор по размерам. Maximum pore size (20 nm) corresponds to the inter-fiber distance - hence, no micropores 19

Related Documents