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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/79326


    Title: 軟膠體之壓縮及微過濾機構之研究
    Other Titles: Studies on mechanisms of compression and microfiltration of soft particles
    Authors: 黃國楨;Hwang, K .J.;王雅婷;Wang, Y.T.
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: 微過濾;軟膠體;濾餅性質;濾餅壓縮;microfiltration;soft colloids;cake property;cake compression
    Date: 2008-09
    Issue Date: 2012-12-03 22:06:11 (UTC+8)
    Publisher: 臺北市:行政院國家科學委員會
    Abstract: 本研究旨在探討軟膠體粒子之微過濾機構及壓縮
    性質。本研究採用三種不同分子量(70 kDa ' 500 kDa 及
    2000 kDa) 的葡聚酵分別與過錳酸鉀交聯成葡聚醣-二氧
    化錳(Dextran-MrlO2)之多孔性軟膠體,此種膠體粒子會
    在受到壓縮後變形,並擠壓出內部水分。實驗結果發
    現,此三種不同之軟膠體雖有相近的粒徑分佈、介達電
    位及密度,但由於其機械強度及壓縮性質導致其過港、行
    為有顯著之差異;當葡聚醣分子量越大,粒子的壓縮變
    形越快達穩定,且由於葡聚醣分子量大的粒子越快壓縮
    成緻密層(skin layer) ,故其過濾、速度會最慢,而掃流速
    度增加,粒子所受的剪切力增加,但不同時間下粒子的
    壓密程度不同,導致擬穩定;在遠不會隨著增加。此外,
    本研究利用J慮、面上粒子之力平衡解析,探討操作條件對
    濾餅成長的影響,發現葡聚醣分子量越大,粒子的附著
    機率越小,導致初始濾餅易壓縮地越緻密,故粒子成長
    厚度越簿,阻力越大。The mechanisms of compression and
    microfiltration of soft particles are studied. Different kinds
    of Dextran-MnO gel particles are prepared depending on
    2 different molecular weights of dextran (70, 500 and 2000
    kDa). The porous soft particles are filtered in "dead-end"
    and "cross-flow" microfiltration, respectively. Although
    the mean sizes, zeta potentials and densities of these
    particles are almost the same, their filtration characteristics
    are far different due to their mechanical strengths and
    compressibility. The deformation and compression of
    particles may reach the pseudo-steady state more quickly
    for the particles constructed with higher molecular weight of dextran. The quicker skin-layer formation leads to a
    lower filtration rate. Although the shear stress acting on the
    membrane surface increases with increasing cross-flow
    velocity, whether the pseudo-steady filtration rate will be
    increased or not is dependent on the cake compression
    course. Moreover, the probabilities of particle deposition
    on the membrane surface under various conditions are
    estimated based on a force balance model. An increase in
    the molecular weight of dextran causes the cake
    compression to be more serious and the filtration rate to be
    lower.
    Relation: 2008年輸送現象及其應用研討會論文摘要集 ( 2008 Symposium of transport phenomena and applications abstract book)
    Appears in Collections:[化學工程與材料工程學系暨研究所] 會議論文

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