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Title: Chapter 2.1 Drying Cellulose Nanofibril Suspensions

Source: In: Production and applications of Cellulose Nanomaterials, TAPPI Press, Chapter 2.1, 2013; pp. 215-217.

Author(s)Peng, Yucheng; Gardner, Douglas J.; Han, Yousoo; Cai, Zhiyong; Tshabalala, Mandla A.

Publication Year: 2013  View PDF »

Category: Book Chapter
Associated Research Project(s):   FPL-4706-2B  FPL-4707-3B

Abstract: Increasing research activity on cellulose nanofibril-based materials provides great opportunities for novel, scalable manufacturing approaches. Cellulose nanofibrils (CNFs) are typically processed as aqueous suspensions because of their hydrophilic nature. One of the major manufacturing challenges is to obtain dry CNFs while maintaining their nanoscale dimensions. Four methods were examined to dry cellulose nanofibril suspensions: (1) air drying, (2) freeze drying (FD), (3) supercritical drying (SCD), and (4) spray-drying (SD). The effects of CNF drying methods on the morphology, thermostability, crystallinity, and dispersion components of surface energy were evaluated using scanning electron microscopy, thermogravimetric analysis, X-ray diffraction and inverse gas chromatography. Air-drying forms bulk CNFs. SCD preserves the nanoscale dimensions of CNFs, resulting in the least thermal stability, lowest crystallinity index, and highest dispersion component of surface energy. FD formed ribbon-like CNF structures with nanoscale thicknesses. SD formed particles with a size distribution ranging from nanometers to several microns. SD produced CNFs with relatively high thermostability and crystallinity indices and also a relatively low dispersion component of surface energy. Spray-drying is proposed as a technically suitable manufacturing process to dry CNF suspensions.

Keywords: cellulose nanofibril; drying

Publication Review Process: Non-Refereed (Other)

File size: 2,829 kb(s)

Date posted: 09/18/2013
RITS Product ID: 65431
Current FPL Scientists associated with this product (listed alphabetically)
Cai, Zhiyong
Supervisory Research Materials Engineer
Tshabalala, Mandla A.
Research Chemist
 

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