Review of Microfibrillated Cellulose (MFC) for Papermaking Yong (Peter) Zou and Jeffery Hsieh
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Transcript of Review of Microfibrillated Cellulose (MFC) for Papermaking Yong (Peter) Zou and Jeffery Hsieh
Review of Microfibrillated Cellulose (MFC) for Papermaking
Yong (Peter) Zou and Jeffery Hsieh
Pulp and Paper Engineering
School of Chemical and Biomolecular Eng.Georgia Institute of Technology
Microfibrillated cellulose (nanofiber)
Definition: Microfibrillated cellulose is isolated and purified cellulose fibres recovered from original cellulose filamentous structure, as cellulose fibres consist of nanometre-scale microfibrils (4 nm wide, 100–200 nm long).
Nano: Sizes / dimensions in the 1-1000 nanometer (billonth, nm)(10-9 m) range
The structure of wood cell and cellulose microfibril
P is the primary wall, S1, S2 and S3 are outer, middle and inner layer of the secondary wall, respectively [ from Iwamoto etal. Appl.Phys. A.81.1109-1112 (2005)
Produce process
Conventionally-mechanical Pulp fiber- original material, refining, high pressure homogenizing
and grinding.
Bioprocess- Enzymatic Reinforcement Process
Pulp Refining Enzyme Homogenizing
GrindingNano-structured Cellulose (NSC)
Characterization
Indirect-characterization products from macroscopic level –induce;
Direct-Modern analysis tools-microscopic level
AFM (atomic force microscopy)
SEM (Scanning Electron Microscope)
TEM (Transmission Electron Microscope)
AFM
SEM
TEM
Paper Industry’s Applications
Papermaking- Improving the strength of paper products including tensile strength, burst strength, tear, density, smoothness and also an effect of increasing the air permeability are obtained. In addition, the capacity of retaining the filler and the adsorption of a dye are also improved by the Nanofiber.
Paper coating- improving printability, decreasing viscosity of the coating material
Comments
Renewable resource Bioprocess-enzyme Lack of experimental data-need more work Extend to non-wood material Add pretreatment to improve efficiency Modify microfibrillated cellulose-(hydrophilic to
hydrophobical nature)