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Characterization of CNC Surfaces by AFM, 2008 International Conference on Nanotechnology for the Forest Product Industry
Characterization of CNC Surfaces by AFM, 2008 International Conference on Nanotechnology for the Forest Product Industry
A Nanotechnology-Driven, Computer-Controlled, Highly Sustainable Process for Making Paper and Board Maximizing Coast Efficiency of Digital Printing, 2008 International Conference on Nanotechnology for the Forest Product Industry
A Nanotechnology-Driven, Computer-Controlled, Highly Sustainable Process for Making Paper and Board Maximizing Coast Efficiency of Digital Printing, 2008 International Conference on Nanotechnology for the Forest Product Industry
Nanotechnology: A US Forest Service Perspective, 2008 PAPERCON Conference
Nanotechnology: A US Forest Service Perspective, 2008 PAPERCON Conference
Journal articles
Magazine articles
Novel CaCO3-polymer nanocomposite fillers for the improvemen
Novel CaCO3-polymer nanocomposite fillers for the improvement of bagasse-based papers, November 2016 TAPPI JOURNAL
Conference papers
Surfactant Modified Cellulose Nanofibrils for Enhanced Oil R
Surfactant Modified Cellulose Nanofibrils for Enhanced Oil Recovery, 2017 NANO
Journal articles
Magazine articles
A novel predictive method for filler coflocculation with cellulose microfibrils, TAPPI Journal November 2019
ABSTRACT: Different strategies aimed at reducing the negative impact of fillers on paper strength have been the objective of many studies during the past few decades. Some new strategies have even been patented or commercialized, yet a complete study on the behavior of the filler flocs and their effect on retention, drainage, and formation has not been found in literature. This type of research on fillers is often limited by difficulties in simulating high levels of shear at laboratory scale similar to those at mill scale. To address this challenge, a combination of techniques was used to compare preflocculation (i.e., filler is flocculated before addition to the pulp) with coflocculation strategies (i.e., filler is mixed with a binder and flocculated before addition to the pulp). The effect on filler and fiber flocs size was studied in a pilot flow loop using focal beam reflectance measurement (FBRM) and image analysis. Flocs obtained with cationic polyacrylamide (CPAM) and benonite were shown to have similar shear resistance with both strategies, whereas cationic starch (CS) was clearly more advantageous when coflocculation strategy was used. The effect of flocculation strategy on drainage rate, STFI formation, ash retention, and standard strength properties was measured. Coflocculation of filler with CPAM plus bentonite or CS showed promising results and produced sheets with high strength but had a negative impact on wire dewatering, opening a door for further optimization.
Conference papers
Tuning Surface Modification of Cellulose Nanocrystals to Max
Tuning Surface Modification of Cellulose Nanocrystals to Maximize Catalytic Activity, 2017 NANO
Fibrillated Cellulose Production â?¢Chemically Assisted Disintegration of the Fiber Cell Wall, 2014 TAPPI International Conference on Naonotechnology for Renewable Materials
Fibrillated Cellulose Production •Chemically Assisted Disintegration of the Fiber Cell Wall, 2014 TAPPI International Conference on Nanotechnology for Renewable Materials
Pre-flocculation of GCC and Clay onto NFC to Improve Strength of Filled Papers, 2013 TAPPI International Conference on Nanotechnology for Renewable Materials
Pre-flocculation of GCC and Clay onto NFC to Improve Strength of Filled Papers, 2013 TAPPI International Conference on Nanotechnology for Renewable Materials
Journal articles
Magazine articles
Characterization of the redispersibility of cellulose nanocrystals by particle size analysis using dynamic light scattering, TAPPI Journal April 2019
ABSTRACT: Cellulose nanocrystals (CNCs), which are derived from the most abundant and inexhaustible natural polymer, cellulose, have received significant interest owing to their mechanical, optical, chemical, and rheological properties. In order to transport CNC products conveniently and efficiently, they are ideally dried and stored as pow-ders using freeze-drying or spray-drying technologies. The redispersibility of CNC powders is quite important for their end use; hence, a convenient method is required to characterize the redispersibility of CNC powders. In this paper, the possibility of characterizing the redispersibility of CNC powders by particle size analysis using dynamic light scattering (DLS) was investigated by comparing the results from transmission electron microscopy (TEM) and DLS. The particle size obtained with DLS approximately matched that obtained with TEM. Compared with TEM, DLS is a quick and convenient method to measure the particle size distribution of CNCs in water. Two kinds of dispersing methods, sonication and high-speed shearing, and two kinds of CNCs prepared by different methods, sulfuric acid hydrolysis and the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) oxidization method, were used to study the redis-persibility of CNCs. Sonication was more efficient than the high-speed shearing method for nanoscale dispersion of CNC powders in water. CNCs prepared by sulfuric acid hydrolysis could be more easily redispersed in water than those prepared by TEMPO oxidation.