The effect of sugar ester on the stability of nano/submicro cellulose dispersion
Date Issued
2006
Date
2006
Author(s)
Chen, Shih Hsin
DOI
zh-TW
Abstract
Cellulose is a naturally abundant polysaccharide, and has application in foods and biomaterials. Cellulose, water soluble or insoluble, has many benefits to human health, such as prevent constipation and possible colon cancer, reduce cholesterol under control, prevention of cardiovascular disease, and loss weight. In this article, the stability of nano/submicro cellulose particles dispersing in water is investigated. Raw cellulose with the volume mean diameter 27.08 ± 14.00 mm is reduced to nano/submicro scale by the processing of medium grinding technology. Sugar esters with different HLB values are applied to be the emulsifier to stabilize the dispersion of nano/submicro cellulose. The influences of the sugar esters with different HLB values and addition levels as well as the concentration effect of cellulose on the dispersibility of suspension are discussed. The turbidity, particle size distribution and TEM morphology are applied to examine the stability of suspension.
The volume mean diameter of cellulose is reduced from 27.08 mm to nano/submicro scale after medium grinding for 90 minutes, which the grinding medium is Y-Zr bead with average diameter 0.3 mm. Suspension without addition of sugar esters is unstable because of the significant aggregation of ultrafine particles, which results in the decrease of turbidity and the increase of particle size. However, the addition of appropriate sugar esters enhances the stability of the dispersion. Sugar esters with HLB 3 and 7 are in general performing good emulsifiers to stabilize the cellulose dispersion, and the suggested addition levels are 2.5 wt% and 5 wt%, respectively. The supernatant of cellulose dispersion after centrifugation (15000 ×g, 60 min) shows an excellent stability during the 30 days storage at room temperature, especially the sample with addition of HLB 3 sugar ester. The weight percentage of nano-particles in supernatant, which the total solid content is 650 ppm, is 60 %. Here, the specific surface area of the suspended particles in supernatant is 7 m2/g, 50 times higher than that of the raw material. Finally, the TEM photographs prove the morphology of nano/submicro cellulose.
Subjects
奈米
次微米
纖維素
懸浮液
蔗糖酯
nano
submicro
cellulose
dispersion
sugar ester
SDGs
Type
thesis
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