A Comparison of Particle Size Distributions Measured by Microscopic (Feret Diameter) and Laser Diffraction Method. Ground Product of Sr-Ferrite.

直哉, 小竹; 裕介, 本間; 直之, 戸井田; 隆裕, 望月; 一郎, 岡; 良照, 神田; 仁, 田口

doi:10.5188/jsmerj.13.13

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“…The imaged particles were analyzed using a built‐in image analysis software. Approximately 10 000 particles were analyzed in each experiment—a number that was sufficient to obtain significant differences in shape parameters among the samples …”

Section: Methodsmentioning

confidence: 99%

Mechanical cell disruption of microalgae for investigating the effects of degree of disruption on hydrocarbon extraction

Tsutsumi

Yokomizo

Saito

et al. 2017

Asia-Pacific J Chem Eng

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The colonial microalga, Botryococcus braunii, produces and stores hydrocarbons in membranes and in colonies. Although hydrocarbons in B. braunii could easily be extracted for biofuel production, yields are actually poor without energy-intensive pretreatment such as thermal drying. To develop extraction methods without drying, we applied the mechanical cell disruption to wet B. braunii using either a high-pressure homogenizer, a bead mill, or a circulating particle disruptor (Jet-Paster) and examined the relationships between the extent of cell and/or colony disruption and extracted hydrocarbon yields using n-hexane. When the number of particles over 20 μm classified as colonies, decreased after each treatment, the hydrocarbon yields of samples treated (over 20%) were much larger than those without treatments (under 5%). Thus, the colony disruption may increase hydrocarbon yields by enhancing n-hexane penetration to the colony. Although the degree of disruption on the Jet-Paster treatment was the lowest (2.2-9.3%) and that of sample treated by the homogenizer was the highest (27-55%), extracted hydrocarbon yields were improved in both treatments. The facts indicate that disrupting large colonies into small colonies improves hydrocarbon recovery, and the fractionation of cells is not needed for hydrocarbon extraction from B. braunii. Figure 4. Distributions of roundness of before and after cell disruption ((a-1), (b-1), and (c-1)) Untreated samples. (a-2) High-pressure homogenizer (30 MPa). (a-3) High-pressure homogenizer (80 MPa). (b-2) Bead mill (8 m/s). (b-3) Bead mill (14 m/s). (c-2) Jet-Paster (4800 rpm). (c-3) Jet-Paster (7200 rpm). S. TSUTSUMI ET AL.Asia-Pacific Journal of Chemical Engineering 460

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Section: Methodsmentioning

confidence: 99%