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Journal articles
Magazine articles
Open Access
Colloid chemical aspects of paper formation in the presence of nanofibrillated cellulose and cationic starch, TAPPI Journal September 2024

ABSTRACT: A series of experimental tests were carried out to examine colloidal-scale consequences of optionally treating nanofibrillated cellulose (NFC) with cationic starches of different charge density and dosage (0.5% or 2.0% by weight), adding that material to a furnish prepared from 100% recycled copy paper, and then subjecting the mixture to very different levels of hydrodynamic shear. Tests included optical microscopy, sediment volume tests, sediment velocity tests, and “percent fines” assessment by means of a fiber quality analyzer (FQA). In addition, the zeta potential and charge demand of the studied materials were evaluated. Optical imaging revealed that cationic starch treatment of the NFC tended to agglomerate it into multiparticle clusters, which sometimes could be mostly redispersed by hydrodynamic shear. Subsequent addition of the starch-treated NFC to the default furnish resulted in much of the colloidal material becoming attached to fibers. Subsequent shearing of the mixtures was at least partly effective in separating the clusters of NFC from the fiber surface, resulting in essentially a two-component mixture. Multiparticle NFC clusters coexisted with the fiber suspension, sometimes attached and sometimes not, depending on the details of treatments. Sediment volume tests showed that systems containing cationic starch-treated NFC tended to have a higher density after settling in comparison to untreated NFC; these findings are consistent with the cationic starch acting as a stabilizer on the solid surfaces, allowing them to slide past each other during the settling process. Application of intense hydrodynamic shear tended to result in denser sediment. Results of tests with the sediment velocity messurement and the FQA percent fines assessment did not correlate well with changes in test conditions considered in this study.

Journal articles
Open Access
Effect of HYP Fibers on Bulk and Surface roughness of Wood-Free Paper, TAPPI JOURNAL April 2008

Effect of HYP Fibers on Bulk and Surface roughness of Wood-Free Paper, TAPPI JOURNAL April 2008

Journal articles
Open Access
Strategies for Economical Alternatives for Wax Replacement in Packaging, TAPPI JOURNAL April 2008

Strategies for Economical Alternatives for Wax Replacement in Packaging, TAPPI JOURNAL April 2008

Journal articles
Open Access
A Diffractive Gloss Meter for Local Gloss Measurements of Papers and Prints, TAPPI JOURNAL April 2008

A Diffractive Gloss Meter for Local Gloss Measurements of Papers and Prints, TAPPI JOURNAL April 2008

Journal articles
Magazine articles
Open Access
Slot die coating of nanocellulose on paperboard, TAPPI Journal January 2018

Slot die coating of nanocellulose on paperboard, TAPPI Journal January 2018

Journal articles
Magazine articles
Open Access
Discrete element method to predict coating failure mechanisms, TAPPI JOURNAL January 2018

Discrete element method to predict coating failure mechanisms, TAPPI JOURNAL January 2018

Journal articles
Open Access
Preparation of specialized paper, Solutions! & TAPPI JOURNAL, April 2004 (349KB)

Preparation of specialized paper, Solutions! & TAPPI JOURNAL, April 2004 (349KB)

Journal articles
Open Access
Performance of cationic styrene maleimide copolymers in the wet end of papermaking, Solutions! & TAPPI JOURNAL, April 2004 (198KB)

Performance of cationic styrene maleimide copolymers in the wet end of papermaking, Solutions! & TAPPI JOURNAL, April 2004 (198KB)

Journal articles
Open Access
Drainage and retention improvement with talc, TAPPI JOURNAL, Online Exclusive, April 2004, Vol. 3(4) (KB)

Drainage and retention improvement with talc, TAPPI JOURNAL, Online Exclusive, April 2004, Vol. 3(4) (KB)

Journal articles
Open Access
Sizing performance and hydrolysis resistance of alkyl oleate succinic anhydrides, Solutions! & TAPPI JOURNAL, July 2004, Vol. 3(7) (251KB)

Sizing performance and hydrolysis resistance of alkyl oleate succinic anhydrides, Solutions! & TAPPI JOURNAL, July 2004, Vol. 3(7) (251KB)

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