The light fantastic Ferocarbon神奇的光铁碳.pptVIP

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2018-06-19 发布于福建
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The light fantastic Ferocarbon神奇的光铁碳.ppt

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The light fantastic Ferocarbon神奇的光铁碳

Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Ferrocarbon Crete September 2008 Nanostructured carbonElectrospinning S.M. Bennington ISIS Horizon Scanning Meeting 9th September 2008 Electrospinning The People Involved Arthur Lovell - STFC Zeynep Kurban – STFC/UCL Derek Jenkins - STFC Bob Stevens - STFC Electrospinning A droplet of polymer in solution is created with a syringe pump High voltage is used to pull a fibre from the droplet The solution evaporates before the fibre hits the collection plate This is a highly controllable process able to produce fibres from 10 μm to 10’s of nm Variables polymer solution: type of polymer polymer concentration molecular weight viscosity conductivity-dielectric constant, surface tension Physical variables flow rate electric potential distance between the capillary and collection screen Solutions PAN in DMSO (4.2-10 wt%) MW = 150,000 PAN in DMF (8-10 wt%) PANI in DMSO (5 wt%) Mw = 50, 100 and 300,000 PAN+PANI in DMSO (9.5+0.5, 9+1,3.6+0.6 wt%) PAN in HFIP (0.25, 0.37, 0.5, 0.67, 0.75 wt%) Other controls Controlled the surface tension with surfactant (SASH) Controlled the conductivity with salts Fibre Diameters To minimise diameter: Low viscosity (without beading) Low flow rate (200 μl/hr used) Low surface tension (add surfactant) High conductivity (add ions and surfactant) Low voltage Increased distance between plate and capillary (27cm) Production carbon fibres The variables are: Time Temperature Stress Impurity content High Temperature Furnace Fibre formation 1500oC 2500oC No oxygen stabilization Oxygen stabilized 1500oC 2200oC 2500oC 2800oC TEM CNF Graphitisated at 2800oC Co-axial fibres Can encapsulate liquids or solids inside polymer Summary