کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
597532 | 1454070 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Multiphase coexistence in colloidal dispersions of positively charged layered double hydroxides
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Colloidal dispersions of Mg-Al (Mg/Al molar ratio 2:1) layered double hydroxide (LDH) have previously been found to exhibit an isotropic-nematic (I-N) phase transition [S.Y. Liu, J. Zhang, N. Wang, W.R. Liu, C.G. Zhang, D.J. Sun, Chem. Mater. 15 (2003) 3240-3241]. In the present paper, we show that an effective attraction induced by the addition of low molecular weight polyethylene glycol (PEG) enriches the phase behavior of Mg-Al LDH dispersions. At certain concentrations of LDH and PEG, multiphase coexistence is observed. The addition of PEG leads to the appearance of a four-phase equilibrium and even a five-phase equilibrium. We explain the experimental phenomena by the interplay between PEG-induced effective attraction, LDH particle polydispersity and sedimentation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 301, Issues 1â3, 5 July 2007, Pages 106-112
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 301, Issues 1â3, 5 July 2007, Pages 106-112
نویسندگان
Wenxia Zhu, Dejun Sun, Shangying Liu, Ning Wang, Jie Zhang, Lingyu Luan,