Shear and extensional rheology of aqueous suspensions of cellulose nanofibrils for biopolymer-assisted filament spinning

Lundahl, Meri; Berta, M.; Ago, Mariko; Stading, Mats; Rojas, Orlando J.

doi:10.1016/j.eurpolymj.2018.10.006

Cited by 46 publications

(64 citation statements)

References 65 publications

(133 reference statements)

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“…This implies that, despite the used geometry comprising serrated plates, the system was subjected to wall depletion effects, as shown earlier for cellulose nanofibril suspensions. 63−66 As such, the rheometer does not purely measure the complex viscosity but rather the friction between the walls. Regardless, addition of 20% lignin lowered such friction, providing the lubrication effect.…”

Section: Resultsmentioning

confidence: 99%

Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels

Wang

Ago

Borghei

et al. 2019

ACS Sustainable Chem. Eng.

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We introduce an eco-friendly process to dramatically simplify carbon microfiber fabrication from biobased materials. The microfibers are first produced by wet-spinning in aqueous calcium chloride solution, which provides rapid coagulation of the hydrogel precursors comprising wood-derived lignin and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNF). The thermomechanical performance of the obtained lignin/TOCNF filaments is investigated as a function of cellulose nanofibril orientation (wide angle X-ray scattering (WAXS)), morphology (scanning electron microscopy (SEM)), and density. Following direct carbonization of the filaments at 900 °C, carbon microfibers (CMFs) are obtained with remarkably high yield, up to 41%, at lignin loadings of 70 wt % in the precursor microfibers (compared to 23% yield for those produced in the absence of lignin). Without any thermal stabilization or graphitization steps, the morphology, strength, and flexibility of the CMFs are retained to a large degree compared to those of the respective precursors. The electrical conductivity of the CMFs reach values as high as 103 S cm –1 , making them suitable for microelectrodes, fiber-shaped supercapacitors, and wearable electronics. Overall, the cellulose nanofibrils act as structural elements for fast, inexpensive, and environmentally sound wet-spinning while lignin endows CMFs with high carbon yield and electrical conductivity.

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Section: Resultsmentioning

confidence: 99%

Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels

Wang

Ago

Borghei

et al. 2019

ACS Sustainable Chem. Eng.

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“…However, they are also limited by the solid concentration of the spinning dopes, i.e., to acquire sufficient interfibrillar interactions. Fibres can be fabricated from more concentrated colloids in wet-spinning of CNF or TOCNF using acetone in the coagulation batch (>1.5 wt.% for CNF and >1 wt.% for TOCNF) (Lundahl et al 2018a). The strong interfibrillar interactions offer better stability for the hydrogel fibres to maintain their shape.…”

Section: Coagulants In Wet Spinningmentioning

confidence: 99%

Mesoporous Carbon Microfibers for Electroactive Materials Derived from Lignocellulose Nanofibrils

Borghei

Ishfaq

Lahtinen

et al. 2020

ACS Sustainable Chem. Eng.

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This work was carried out during 2016-2020, under the supervision of Professor Orlando J. Rojas. This dissertation was completed under the framework of the DWoC project funded by Business Finland, the "High-value Products from Lignin" (LIFT) project under the NordForsk program and the "BioELCell" (788489) program under the European Commission H2020-ERC-2017-Advanced Grant. Additional acknowledgement goes to the Paper Engineer's Association and Walter Ahlström foundation for their financial support for conference travels. I like to give my deepest appreciation to Professor Orlando J. Rojas for providing me the opportunity to challenge myself for the duration of my doctoral degree. I feel so lucky to become your student. The process was not that smooth, but you are always there to help me. The trust, freedom, knowledge and patience you have given, were all crucial to get me to this stage. The positive influences do not only go to my scientific research, but also to my attitude to life. I am extremely grateful for all your support and guidance. These words cannot express all my feelings, nor my thanks for all your helps. A special thank you to my thesis advisors Dr. Maryam Borghei and Professor Mariko Ago. Maryam, it was great to work alongside you and discover the topic of my doctoral thesis. As an advisor, you are always there for me. Thank you for helping me fix all the issues on both experiments and writings. Mariko, you were with me during the first two years of my doctoral studies, which was a very important time for growth. In order to find my research topic, we tried numerous experiments together; it was a great experience. I also want to thank Gisela Cunha and Julio Arboleda who were my advisors for a short term but gave me good suggestions and inspirations. My gratitude also goes to the project members in DWoC and LIFT. I am especially thankful to Hannes Orelma for managing the WP6 team with such a wonderful and creative atmosphere. A great thanks goes to Meri Lundhal, who introduced spinning to me and acted as an advisor during the whole PhD process. Thank you for all the training and advices you have given and the introduction to Teraloop. Thanks also go to

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“…In general, by determining the rheological properties of biopolymers like polysaccharides and proteins, the composition, texture and structural changes observed during agitation, processing, packaging, storage and consumption can be elucidated (Rodriquez‐Gonzalez and Bello‐Perez, ). Flow behaviour is critical for the processability of a biopolymer solution (Lundahl et al , ). Rheological data are important for processes involving fluid flow, for example filtration and extraction, and are also useful for designing processes like pasteurisation, evaporation and drying (Marcotte et al , ).…”

Section: Introductionmentioning

confidence: 99%

Shear and extensional rheology of selected polysaccharides

Evageliou

2020

Int J of Food Sci Tech

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Rheology is used for the elucidation of the flow properties of polysaccharide solutions. For a given polysaccharide, both shear and extensional rheological experiments should be performed for the full characterisation of its flow properties. The provided information will facilitate the efficient exploitation of a polysaccharide in various applications. Although shear rheology is widely used in polysaccharides' characterisation, there are only limited extensional rheology studies due to lack of reliable techniques in the formation of pure extensional flow. However, recently, several commercial extensional rheometers have been developed and thus, accurate extensional experiments can now be performed. The present work initially presents the principles and concepts of both shear and extensional rheology and then reports rheological findings for solutions of various polysaccharides and their derivatives. Xanthan and various members of the galactomannan, cellulose and alginate families were selected.

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Shear and extensional rheology of aqueous suspensions of cellulose nanofibrils for biopolymer-assisted filament spinning

Cited by 46 publications

References 65 publications

Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels

Conductive Carbon Microfibers Derived from Wet-Spun Lignin/Nanocellulose Hydrogels

Mesoporous Carbon Microfibers for Electroactive Materials Derived from Lignocellulose Nanofibrils

Shear and extensional rheology of selected polysaccharides

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