The Use of Sodium Chlorite in Post-Oxidation of TEMPO-Oxidized Pulp: Effect on Pulp Characteristics and Nanocellulose Yield
Bibliographic record
Abstract
Abstract Presence of aldehydes on cellulose nanofibers (alternatively called nanocellulose) produced from TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyle)-oxidized pulp could interfere with the grafting of selected compounds on the carboxyls group of the oxidized pulp or of the nanofibers produced from such pulps. A simple protocol, called post-oxidation, utilizing sodium chlorite under acidic conditions has been developed for TEMPO-oxidized native cellulose to oxidize the aldehydes to carboxyls. The chemical nature, degree of polymerization, nanocellulose yield, and brightness stability of the post-oxidized pulp was characterized and compared with those of pulps prepared by the post-oxidation methods published in the literature. A sodium chlorite charge of 10% was sufficient for the oxidation of the TEMPO-oxidized pulp, which had a residual aldehydes content of ∼100 mmol/kg. We had observed an increase in degree of polymerization, nanocellulose yield, and brightness stability due to post-oxidation. It was found that aldehyde groups contributed significantly to the brightness reversion and yellowing of the TEMPO-oxidized pulp.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".