国产精品视频一区二区三区四,亚洲av美洲av综合av,99国内精品久久久久久久,欧美电影一区二区三区电影

產(chǎn)品推薦:氣相|液相|光譜|質譜|電化學|元素分析|水分測定儀|樣品前處理|試驗機|培養(yǎng)箱


化工儀器網(wǎng)>技術中心>其他文章>正文

歡迎聯(lián)系我

有什么可以幫您? 在線咨詢

Rheology of cellulose nanofibrils in the presence of surfactants

來源:美國布魯克海文儀器公司   2017年03月24日 13:36  

作者 Nawal Quennouz,a   Sara M. Hashmi,a   Hong Sung Choi,b   Jin Woong Kimcd and    Chinedum O. Osujia

a Department of Chemical and Environmental Engineering, Yale University, New Haven CT 06511, USA

: chinedum.osuji@yale.edu

b Shinsegae International Co. Ltd, Seoul, Republic of Korea

c Department of Applied Chemistry, Hanyang University, Ansan, Republic of Korea

d Department of Biono Technology, Hanyang University, Ansan, Republic of Korea

 

摘要:Cellulose nanofibrils (CNFs) present unique opportunities for rheology modification in complex fluids. Here we systematically consider the effect of ionic and non-ionic surfactants on the rheology of dilute CNF suspensions. Neat suspensions are transparent yield-stress fluids which display strong shear thinning and power-law dependence of modulus on concentration, G  c2.1. Surfactant addition below a critical mass concentration cc produces an increase in the gel modulus with retention of optical clarity. Larger than critical concentrations induce significant fibril aggregation leading to the loss of suspension stability and optical clarity, and to aggregate sedimentation. The critical concentration was the lowest for a cationic surfactant (DTAB), cc 0.08%, while suspension stability was retained for non-ionic surfactants (Pluronic F68, TX100) at concentrations up to 8%. The anionic surfactant SDS led to a loss of stability at cc 1.6% whereas suspension stability was not compromised by anionic SLES up to 8%. Dynamic light scattering data are consistent with a scenario in which gel formation is driven by micelle–nanofibril bridging mediated by associative interactions of ethoxylated surfactant headgroups with the cellulose fibrils. This may explain the strong difference between the properties of SDS and SLES-modified suspensions. These results have implications for the use of CNFs as a rheology modifier in surfactant-containing systems.

免責聲明

  • 凡本網(wǎng)注明“來源:化工儀器網(wǎng)”的所有作品,均為浙江興旺寶明通網(wǎng)絡有限公司-化工儀器網(wǎng)合法擁有版權或有權使用的作品,未經(jīng)本網(wǎng)授權不得轉載、摘編或利用其它方式使用上述作品。已經(jīng)本網(wǎng)授權使用作品的,應在授權范圍內(nèi)使用,并注明“來源:化工儀器網(wǎng)”。違反上述聲明者,本網(wǎng)將追究其相關法律責任。
  • 本網(wǎng)轉載并注明自其他來源(非化工儀器網(wǎng))的作品,目的在于傳遞更多信息,并不代表本網(wǎng)贊同其觀點和對其真實性負責,不承擔此類作品侵權行為的直接責任及連帶責任。其他媒體、網(wǎng)站或個人從本網(wǎng)轉載時,必須保留本網(wǎng)注明的作品第一來源,并自負版權等法律責任。
  • 如涉及作品內(nèi)容、版權等問題,請在作品發(fā)表之日起一周內(nèi)與本網(wǎng)聯(lián)系,否則視為放棄相關權利。
企業(yè)未開通此功能
詳詢客服 : 0571-87858618
韶山市| 交城县| 大关县| 开封县| 六安市| 丽水市| 隆回县| 罗源县| 伊通| 宁津县| 科技| 林州市| 尉犁县| 大连市| 瑞金市| 九寨沟县| 武乡县| 辽源市| 徐州市| 胶州市| 增城市| 凯里市| 城步| 社会| 平武县| 木兰县| 桐庐县| 宁安市| 高尔夫| 巴中市| 垫江县| 东明县| 庆安县| 曲阳县| 德惠市| 绥阳县| 扎赉特旗| 达日县| 濉溪县| 合水县| 江西省|