Electroosmotic dewatering of cellulose nanocrystals

Wetterling, Jonas; Sahlin, Karin; Mattsson, Tuve; Westman, Gunnar; Theliander, Hans

doi:10.1007/s10570-018-1733-3

Cited by 21 publications

(13 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In electrofiltration, an electric field is applied to influence the filtration of negatively charged CNCs by inducing an electrophoretic force in the direction of the anode, thereby influencing the filter cake growth. At the same time, it also induces motion of the fluid in the direction of the cathode, which drives solid–liquid separation [ 243 , 244 ]. In this process, the electric field is a dominant factor influencing the dewatering rate, exceeding the effect of modifying suspension conditions.…”

Section: Drying and Dewatering Of Cellulosic Nanomaterialsmentioning

confidence: 99%

Towards sustainable production and utilization of plant-biomass-based nanomaterials: a review and analysis of recent developments

Zhu

Agarwal

Ciesielski

et al. 2021

Biotechnol Biofuels

View full text Add to dashboard Cite

Plant-biomass-based nanomaterials have attracted great interest recently for their potential to replace petroleum-sourced polymeric materials for sustained economic development. However, challenges associated with sustainable production of lignocellulosic nanoscale polymeric materials (NPMs) need to be addressed. Producing materials from lignocellulosic biomass is a value-added proposition compared with fuel-centric approach. This report focuses on recent progress made in understanding NPMs—specifically lignin nanoparticles (LNPs) and cellulosic nanomaterials (CNMs)—and their sustainable production. Special attention is focused on understanding key issues in nano-level deconstruction of cell walls and utilization of key properties of the resultant NPMs to allow flexibility in production to promote sustainability. Specifically, suitable processes for producing LNPs and their potential for scaled-up production, along with the resultant LNP properties and prospective applications, are discussed. In the case of CNMs, terminologies such as cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs) used in the literature are examined. The term cellulose nano-whiskers (CNWs) is used here to describe a class of CNMs that has a morphology similar to CNCs but without specifying its crystallinity, because most applications of CNCs do not need its crystalline characteristic. Additionally, progress in enzymatic processing and drying of NPMs is also summarized. Finally, the report provides some perspective of future research that is likely to result in commercialization of plant-based NPMs.

show abstract

Section: Drying and Dewatering Of Cellulosic Nanomaterialsmentioning

confidence: 99%

Towards sustainable production and utilization of plant-biomass-based nanomaterials: a review and analysis of recent developments

Zhu

Agarwal

Ciesielski

et al. 2021

Biotechnol Biofuels

View full text Add to dashboard Cite

show abstract

“…Electro-assisted filtration for microfibrillated cellulose (MFC) helps tackle this issue (10-30 mins/100 ml of diluted suspension) but only through an increase in the overall energy consumption (Wetterling et al 2017). Electroosmotic filtration for CNC has been demonstrated to be energy efficient as compared to the thermal methods, however, higher dewatering rates increases these energy requirements and their applicability to CNF remains unknown (Wetterling et al 2018). Other methods using filtration have employed additives such as salts (Sim et al 2015) and wood pieces (Amini et al 2019) to assist in phase separation for CNFs, however their recovery is either not feasible or economically unviable.…”

Section: Spray Dryingmentioning

confidence: 99%

Dewatering of Cellulose Nanofibrils using Ultrasound

Ringania¹,

Harrison²,

Moon³

et al. 2021

Preprint

View full text Add to dashboard Cite

Although cellulose nanomaterials have promising properties and performance in a wide application space, one hinderance to their wide scale industrial application has been associated with their economics of dewatering and drying and the ability to redisperse them back into suspension without introducing agglomerates or lose of yield. The present work investigates the dewatering of aqueous suspensions of cellulose nanofibrils (CNF) using ultrasound as a potentially low-cost, non-thermal, and scalable alternative to traditional heat-based drying methods such as spray drying. Specifically, we use vibrating mesh transducers to develop a direct-contact mode ultrasonic dewatering platform to remove water from CNF suspensions in a continuous manner. We demonstrate that the degree of dewatering is modulated by the number of transducers, their spatial configuration, and the flow rate of the CNF suspension. Water removal of up to 72 wt.% is achieved, corresponding to a final CNF concentration of 11 wt.% in 30 minutes using a twotransducer configuration. To evaluate the redispersibility of the dewatered CNF material, we use a microscopic analysis to quantify the morphology of the redispersed CNF suspension. By developing a custom software pipeline to automate image analysis, we compare the histograms of the dimensions (length, width) of the redispersed dewatered fibrils with the original CNF samples and observe no significant difference, suggesting that no agglomeration is induced due to ultrasonic dewatering. We estimate that this ultrasound dewatering technique is also energyefficient, consuming up to 36% less energy than the enthalpy of evaporation per kilogram of water. Together with the inexpensive cost of transducers (<$1), the potential for scaling up in parallel flow configurations, and excellent redispersion of the dewatered CNF, our work offers a proof-ofconcept of a sustainable CNF dewatering system, that addresses the shortcomings of existing techniques.

show abstract

“…[37] Another study showed that by using electro-assisted dewatering of a cellulose nanocrystal suspension, the solid content of the furnish could increase to 15.3 wt%. [38] One interesting approach to dewatering of high MNFC suspensions is to replace the aqueous phase with a foam. During the last decade, foam forming has been extensively studied as an alternative method for the production of high MNFC content products with high bulk and strength properties, such as in Styrofoam replacements.…”

Section: Introductionmentioning

confidence: 99%

Fast dewatering of high nanocellulose content papers with in-situ generated cationic micro-nano bubbles

et al. 2021

View full text Add to dashboard Cite

Herein, an innovative method to improve the dewatering of micro-and nanofibrillated cellulose (MNFC) containing furnishes is proposed. This method is based on fiber flotation in which cationic bubbles are injected into the furnish to separate fibers from liquid medium and accumulate them on the surface of the furnish. These cationic bubbles are generated by pressurizing a solution of Hexadecyltrimethylammonium chloride in deionized water in a dissolved air flotation (DAF) tank. The drainage properties of the furnishes with MNFC content from 0% to 25% were studied. With the help of the cationic bubbles, drainage rate of 0% and 15% MNFC furnish increased from 183 ml/s to 210 ml/s and 38 ml/s to 113 ml/s, respectively. The final couch solids content of these furnishes also increased from 16 wt% to 23 wt% and from 21 wt% to 24 wt%, respectively. Cationic bubbles flocculate MNFC fibers and increase retention. Sheets characteristics including morphology, permeability, mass distribution and surface profilometry were investigated. Cationic bubbles help structure fiber elements and improve the sheet formation.

show abstract

Electroosmotic dewatering of cellulose nanocrystals

Cited by 21 publications

References 39 publications

Towards sustainable production and utilization of plant-biomass-based nanomaterials: a review and analysis of recent developments

Towards sustainable production and utilization of plant-biomass-based nanomaterials: a review and analysis of recent developments

Dewatering of Cellulose Nanofibrils using Ultrasound

Fast dewatering of high nanocellulose content papers with in-situ generated cationic micro-nano bubbles

Contact Info

Product

Resources

About