Nanoselluloosat kuitutuotteiden lisäaineina ja vesien puhdistuksen kemikaaleina - PDF

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Nanoselluloosat kuitutuotteiden lisäaineina ja vesien puhdistuksen kemikaaleina FiberTech 2016, 31 Aug. Henrikki Liimatainen Fiber and Particle Engineering University of Oulu 1 Fiber and Particle Engineering

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Nanoselluloosat kuitutuotteiden lisäaineina ja vesien puhdistuksen kemikaaleina FiberTech 2016, 31 Aug. Henrikki Liimatainen Fiber and Particle Engineering University of Oulu 1 Fiber and Particle Engineering research group Professor: Mirja Illikainen, head of the group FiDiPro-professor: Kristiina Oksman, composites Assoc. Prof. Henrikki Liimatainen, tenure track position on nanocellulosic materials Staff: 30 Budget: 2,05 MEUR External funding: 82% 2 Nanocellulose research Modification: deep eutectic solvents and regioselective oxidation Nanofibrils and Nanocrystals 3 Pulp and paper Municipal waters Industrial waste waters Mining and mineral processing Chemical oil-spill agents, arctic waters Bionanochem icals Flocculants Adsorbents Surfactants L= nm, D= 2-10 nm Sheet-like materials Paper and board Membranes and filters Films and barriers Special materials Paper, packaging Industrial waters Packaging Electronics NANOCELLULOSES - PRESENT STATUS 4 Origin of wood nanocelluloses 5 Cellulose nanofibrils and nanocrystals Cellulose nanocrystals (CNC) Nanofibrillated cellulose (NFC) Pääkkö et al. 2007, Biomacromolecules 6 Nanocelluloses Osong et al Characteristics of nanocelluloses L= nm, D= 2-10 nm - Very good mechanical properties - Highly hydrophilic - Easy to functionalize - Transparent - Self-assembly - Specific optical properties: birefringence. 8 Nanocellulose production facilities 9 Miller et al. 2014; Osong et al 2015 Challenges in nanocellulose commercialization Technical - Production capacity and efficiency - Requires high intensity mechanical treatments Chemicals pretreatments are used to loosen the fiber structure - Feasibility of chemicals (toxicity etc.) - Recycling and reuse of chemicals Economical - Raw material price - Energy and chemical costs - Investment costs - Limited market volumes in terms of materials tonnes 10 Nanocelluloses from secondary sources Pretreatment with DES Milling B = board MCB = milk container board F = fluting DES = deep eutectic solvent 11 NANOCELLULOSES AS ADDITIVES IN FIBER PRODUCTS 12 Potential of nanocelluloses in fiber products Benefits - Strength additives - To reduce paper grammage - To enhance barrier properties - To improve visual appearance of paper (e.g. gloss) - Smart packaging and functionalities (e.g. security papers) Drawbacks - Decrease in drainage of pulp - Decrease in porosity (e.g. affect drying and sizing) 13 Fluting medium strengthened by periodate chlorite oxidized nanofibrillated celluloses T10% refers to talc filler 14 Hietala et al. Cellulose, 2015 Fluting medium strengthened by periodate chlorite oxidized nanofibrillated celluloses Reference 2% NFC 15 Hietala et al. Cellulose, 2015 Reinforcing board by nanocelluloses from secondary raw materials Handsheets from board pulp + starch + retention aid + nanocelluloses (4%) DES pretreated NaOH pretreated Nanocelluloses from: BCP= Bleached hardwood kraft B = board, MCB = milk contained board F = fluting Reinforcing potential depends on the size of the nanocelluloses 16 Optimization of nanocellulose properties The effect of reduced mechanical grinding of nanocelluloses (passes through Masuko grinder) sdf 17 Nanocelluloses as retention aids for calcium carbonate Handsheets from bleached birch pulp + GCC+ nanocellulose (DCC/TEMPO 2 or 4%) Cellulose nanofibrils: DCC TEMPO 18 Ämmälä et al. Cellulose, 2013 Anionic nanofibrils are able to interect with GCC and increase its retention Oxygen barrier films from nanocelluloses modified with regioselective oxidative treatments 19 Sirviö et al. ACS Applied Materials & Interfaces, 2014 Nanocellulose talc hybrid barrier films Liimatainen. ACS Applied Materials and Interfaces, Composite films of poly(vinyl alcohol) and cross-linking cellulose nanocrystals 21 Sirviö et al. ACS Applied Materials and Interfaces Antimicrobial film from cationized nanofibrils * O O H OH O OH * NaIO 4 * OH O O O O OH * O O * N N Cl - NH O O N + N + Cl - H N + OH H * O O Cl - * N N NH H H N + N + Cl - H H NH2 NH 2 H N + N O H N H cat.h + a) 2 * b) 2 H N H cat. H N H 2 N H + Cl - Sirviö et al. Carbohydrate Polymers, NANOCELLULOSES AS WATER TREATMENT CHEMICALS 23 Nanocelluloses as Bionanochemicals - Hydrophilic, elongated structure of nanocelluloses especially cellulose nanofibrils make them attractive green alternatives for current synthetic polymers and inorganic compounds novel class of bionanochemicals based on bio-based nanoparticles (instead of soluble compounds) - Sustainable, green origin - Strong, highly elongated structure - Biodegradability, low toxicity - New functionalities and characteristics (e.g. Pickering emulsions) 24 Removal of colloids by anionized and cationized nanofibrils L= nm, D= 2-10 L= nm nm, D= 2-10 nm 25 Liimatainen et al. Carbohydrate polymers, 2014; Suopajärvi, Liimatainen et al. Chemical Engineering Journal 2013 Lead adsorption Lead adsorption with sulfonated wheat pulp nanofibrils L= nm, D= 2-10 L= nm nm, D= 2-10 nm Sulfonated NFC Unmodified NFC Suopajärvi et al. Journal of Water Process Engineering, Recovery of silver species from modified cellulose L= nm, D= 2-10 L= nm nm, D= 2-10 nm Dwidedi et al. International Journal of Biological Macromolecules, L= nm, D= 2-10 L= nm nm, D= 2-10 nm Thank you! 28
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