《纳米纤维素》PPT课件.ppt

Introduction of Wood-related Materials Research in Edinburgh Napier University,11/11/2019,Can Trees Transform Our Life,11/11/2019,Page 2,Forest Products Research Institute,One of the nine institutes in Edinburgh Napier University Work of existing Centre for Timber Engineering separated and new institute established in 2010 Includes four specialist research centres Various resources funding projects (Scottish government, Edinburgh Napier University, industrial companies etc),11/11/2019,Page 3,Centres in FPRI,Two centres focus on design and construction of wood products The Wood Studio Centre for Timber Engineering Two centres deal with wood-related materials science and chemistry research Centre for Plant Science and Biopolymer Research Centre for Wood Science and Technology,11/11/2019,Page 4,Nanocellulose Project,Collaborative research project between Napier and Sappi Fabrication of cellulose nanofibrils from pulps Utilising cellulose nanofibrils (in-house and external) to make high strength fibres Scale up the process to a industrial level,11/11/2019,Page 5,Nanocellulose Project,11/11/2019,Page 6,Fine Paper (Graphics),Speciality Release Paper,Structure of Cellulose Fibres,11/11/2019,Page 7,Processing of Nano Cellulose,Mechanical process Acid hydrolysis Purification (removal of unused stuff and purify the remaining) Dialysis process (adjust pH of cellulose suspension) (Optional) Counter ions (in order to adjust surface charge) Concentration Mixing Gel storage (aging effect),11/11/2019,Page 8,Cellulose Powder (Mechanical Process),11/11/2019,Page 9,Pulp,shredder,Shredded Pulp,Ball Milling,250m wire mesh Filter,Cellulose Powder,11/11/2019,Page 10,Centrifuge,Centrifuge to remove acid and waste,Dialysis 3-5 days to remove sulphuric acid and increase pH,11/11/2019,Page 11,Centrifuge will be used subsequently to adjust zeta potential (counter ions) The concentration of the sample will be increased (gel) Roll mill will be used to further mix the gel after centrifugation/concentration to reduce the domain size and increase homogeneity The gel samples are stored in falcon tube in fridges,Cellulose gels,11/11/2019,Page 12,11/11/2019,Page 13,Chiral Nematic domains,Aim to align particles under flow,Experiment designed to study alignment and ultimately process fibres with similar properties,Fibre Spinning Process,Fabrication of cellulose fibres using dry spinning process,11/11/2019,Page 14,Gel,Piston,Die/Spinneret Attachment,Pressure Transducer,Hyperbolic Die Capillary Die,11/11/2019,Page 15,11/11/2019,Page 16,11/11/2019,Page 17,Lyocell Measured at 36.5cN/tex,Measured at 6cN/tex,Multicoloured domains,Uniform Blue Colour,Spun Fibre under cross-polarised microscope,Flow Cell Test,11/11/2019,Page 18,Hyperbolic Die,Capillary Die,11/11/2019,Page 19,6mm/min,18mm/min,27mm/min,54mm/min,91 mm/min,182mm/min,Gel Sample at 18.44% solids and no counter ion,Darkening in flow channel as molecules align,Modification/Improvement of the process,New flow cell design for high temperature test Multi-spinneret die design (new drying and draw down mechanism) A new diafiltration system (all in one system to replace hydrolysis-dialysis-purification-concentration process) A new