纳米纤维素

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Structure of Cellulose Fibres
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Processing of Nano Cellulose
Mechanical process Acid hydrolysis Purification (removal of unused stuff and purify the remaining)
6mm/min
18mm/min
27mm/min
54mm/min
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91 mm/min
Darkening in flow channel as molecules align
182mm/min
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Modification/Improvement of the process
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Nanocellulose Project
Fine Paper (Graphics) Speciality – Release Paper
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Two centres deal with wood-related materials science and chemistry research • Centre for Plant Science and Biopolymer Research • Centre for Wood Science and Technology
Experiment designed to study alignment and ultimately process fibres with similar properties
Chiral Nematic domains
Aim to align particles under flow
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Cellulose Powder (Mechanical Process)
Pulp
shredder
Shredded Pulp
Ball Milling
Cellulose Powder
250µm wire mesh Filter
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Cellulose gels
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Fibre Spinning Process
Re-checked at 16.7 cN/tex Lyocell 40cN/tex Commercial Viscose 20-25 cN/tex Low tenacity values
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Fabrication of cellulose fibres using dry spinning process
Pressure Transducer
Piston
Gel Die/Spinneret Attachment Hyperbolic Die Capillary Die
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 team of chemists recently formed to research on chemical treatment of cellulose gels
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
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Centrifuge will be used subsequently to adjust zeta potential (counter ions)
The concentration of the sample will be increased (gel)
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Project Target ≥150 cN/tex
IntermediateTarget 100cN/tex
Can Trees Transform Our Life
Introduction of Wood-related Materials Research in Edinburgh Napier University
1/23/2016
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Flow Cell Test
Hyperbolic Die Capillary Die
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Gel Sample at 18.44% solids and no counter ion
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Centrifuge
Centrifuge to remove acid and waste
Dialysis 3-5 days to remove sulphuric acid and increase pH
Dialysis process (adjust pH of cellulose suspension)
(Optional) Counter ions (in order to adjust surface charge) Concentration Mixing Gel storage (aging effect)
Spun Fibre under cross-polarised microscope
Measured at 6cN/tex
Lyocell Measured at 36.5cN/tex
Multicoloured domains
Uniform Blue Colour
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Centres in FPRI
Two centres focus on design and construction of wood products
• The Wood Studio • Centre for Timber Engineering
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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)
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New Diafiltration System
Hydrolysis Product
RO water
Tank
Flow Rotameter Flow Rotameter Retentate Filter P MgCO3/Na2CO3 Neutralisation Cylinder Drain Permeate Dump Tank
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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