Micro and nanofibrillated cellulose (MNFC) as additive in complex suspensions: influence on rheology and dewatering

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School of Chemical Technology | Doctoral thesis (article-based) | Defence date: 2014-06-12
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152 + app. 129
Aalto University publication series DOCTORAL DISSERTATIONS, 73/2014
The traditional forest products, such as paper, packaging and viscose products, have their well-established place, but further efforts urgently need to be made to meet growing ecological demands, increasing economic pressure and to develop new technologies for utilisation of high performance materials. Nanocellulose applied in paper making suspensions and as water retention control aids may introduce additional strength properties in traditional products, and when considered for coatings may deliver oil and gas barrier properties as well as targeted liquid interactions based on surface energy criteria and designed pore and gel network structures. The properties increase the potential for their use in a broad range of novel products. The processes, firstly by which nanocellulose is both created, as part of cellulose structures in nature, and subsequently produced determine their aqueous suspension rheology and dewatering behaviour, and thus, by using knowledge of their rheological behaviour when utilised in complex suspensions, will support the creation of new controls in water-based production processes. The use of rheology for the characterisation of nanocellulose suspensions and their applications in a range of industries as diverse as the oil and papermaking industries has been the subject of numerous studies in recent years. Although many studies have been conducted relating to papermaking furnishes and their water suspensions while including nanocellulose containing materials, these rheological investigations were conducted independently from conditions of dynamic dewatering. For the first time, this work sets out to observe and try to overcome experimental difficulties related to rheometry and dynamic dewatering of high consistency viscoelastic gel-like nanocellulose suspensions using a variety of experimental techniques and methods. Once reliable rheological measurements were designed and the methodology established, the work goes on to analyse the possible structures attained by nanocellulose containing suspensions in combination with macroscopic fibres, pigments and fibril dispersing polymers, which traditionally are used as pigment flocculant water retention aids. These analyses are used to support and challenge the basic hypotheses of the thesis in relation to the impact these structures will have on properties such as process applicability, phase separation, substrate coverage, coating and material uniformity.  
Supervising professor
Paltakari, Jouni, Prof., Aalto University, Department of Forest Products Technology, Finland
Thesis advisor
Gane, Patrick, Prof., Aalto University, Department of Forest Products Technology, Finland
rheology, nanocellulose, coating, dewatering, immobilisation
Other note
  • [Publication 1]: Katarina Dimic-Misic, Antti Puisto, Patrick Gane, Kaarlo Nieminen, Mikko Alava, Jouni Paltakari, Thaddeus Maloney (2013) The role of MFC/NFC swelling in the rheological behavior and dewatering of high consistency furnishes, Cellulose 6: 2847-2861. DOI 10.1007/s10570-013-0076-3
  • [Publication 2]: Katarina Dimic-Misic, Antti Puisto, Jouni Paltakari, Mikko Alava, Thaddeus Maloney (2013) The influence of shear on the dewatering of high consistency nanofibrillated cellulose furnishes, Cellulose 20:1853-2020. DOI 10.1007/s10570-013-9964-9
  • [Publication 3]: Katarina Dimic-Misic, Patrick Gane, Jouni Paltakari (2013): Micro and nanofibrillated cellulose as rheology modifier additive in CMC-containing pigment coating formulations, Industrial and Engineering Chemistry Research 52: 16055-16083.
    DOI: 10.1021/ie4028878 View at publisher
  • [Publication 4]: Katarina Dimic-Misic, Tuomo Salo, Jouni Paltakari, Patrick Gane (2014) Comparing the Rheological Properties of Novel Nanofibrillar Cellulose-formulated Pigment Coating Colours with those using Traditional Thickener, Nordic Pulp and Paper Journal 29: 253-270
  • [Publication 5]: Katarina Dimic-Misic, Cathy Ridgway, Thaddeus Maloney, Jouni Paltakari, Patrick Gane (2014) Influence on pore structure of micro/nanofibrillar cellulose in pigmented coating formulations, Transport in Porous Media. Volume 103, Issue 2, pp 155-179.
    DOI: 10.1007/s11242-014-0293-8 View at publisher
  • [Publication 6]: Mikael Mohtaschemi, Katarina Dimic-Misic, Antti Puisto, Marko Korhonen, Thaddeus Maloney, Jouni Paltakari, Mikko Alava (2014) Rheological characterisation of fibrillated cellulose suspensions via bucket vane viscometer, Cellulose. Volume 21, Issue 3, pp 1305-1312.
    DOI: 10.1007/s10570-014-0235-1 View at publisher