期刊
CARBOHYDRATE POLYMERS
卷 178, 期 -, 页码 48-56出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.09.028
关键词
Microcrystalline cellulose; Nearcritical water; Microfluidization; Nanocellulose; Pickering emulsions
资金
- Aalto University's Doctoral Programme in Chemical Technology
- European COST Action [FP1205]
This paper takes a comparative approach in characterizing two types of nano-scale cellulosic particles obtained using chemical-free pathways, either by nearcritical water treatment or by high-shear homogenization from the same microcrystalline cellulose (MCC). The nearcritical water treatment efficiently depolymerized cellulose, producing a solid precipitated fraction of low-molecular-weight material containing cellulose II, while homogenization mechanically deconstructed MCC without altering its molecular structure. Both pathways yielded nanocellulose-like materials yet with different morphologies. The mechanically produced, rod-like particles were obtained with high yield. In contrast, the hydrothermal precipitate exhibited more hydrophobic ribbon-like particles that provided a greater level of particle-particle interaction. Both materials successfully acted as stabilizers for oil-in-water Pickering emulsions; however, the hydrothermally-produced material exhibited superior performance, with stable emulsions obtained upon addition of as low as 1.0 wt.% cellulose. These two pathways are highly relevant for altering the structure and properties of MCC and for formulating new, sustainably produced nanocellulose-based materials.
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