I,m synthesis carboxy cellulose nano fiber but gradually material's pH going to acidic without centrifuge. now my step is drying this material's. how can i do this?
Dear friend Arafat Mahamud B.
According to a study (A comprehensive analysis and comparison between vacuum and electric ....), the best temperature to keep the active component is about 50–90 °C. The study also suggests that the optimal drying temperature was 100 °C for 20 min for two evaluated methods, however considering the machine cost, the electric oven drying would be the first choice.
I couldn't find any information on whether you need to adjust pH before drying. However, I found a research paper (Drying cellulose nanofibrils: in search of a suitable method........) that used freeze-drying to dry carboxymethyl cellulose nanofibers without adjusting pH before drying.
Another study (Effect of Drying Methods on Structure and Mechanical Properties of ....) applied different drying methods to suspensions just after mixing. Oven drying (OD) was performed at 105 °C for 24 h in glass beakers. Prior to freeze drying (FD), CNF suspensions (about 20 mL) were frozen in vials at a temperature of −80 °C for 24 h. According to this research paper on the drying of cellulose nanofibrils, the most suitable drying methods are freeze-drying and oven-drying. However, the paper does not mention whether pH adjustment is necessary before drying. I suggest you read this paper for more information on the drying process of cellulose nanofibrils. I hope this helps!
Source:
(1) A comprehensive analysis and comparison between vacuum and electric .... https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6431308/.
(2) Drying cellulose nanofibrils: in search of a suitable method. https://link.springer.com/article/10.1007/s10570-011-9630-z.
(3) Effect of Drying Methods on Structure and Mechanical Properties of .... https://www.researchgate.net/publication/272627985_Effect_of_Drying_Methods_on_Structure_and_Mechanical_Properties_of_Bacterial_Cellulose_Films.
(4) Drying and redispersion of plant cellulose nanofibers for industrial .... https://link.springer.com/article/10.1007/s10570-020-03348-7.
(5) Home - PMC - NCBI - National Center for Biotechnology Information. https://www.ncbi.nlm.nih.gov/pmc/.
(6) A feasible approach efficiently redisperse dried cellulose nanofibrils .... https://link.springer.com/article/10.1007/s10570-020-03591-y.
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