کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4982629 1453864 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modulating the zeta potential of cellulose nanocrystals using salts and surfactants
ترجمه فارسی عنوان
پالایش پتانسیل زتا از نانوکریستالهای سلولز با استفاده از نمکها و سورفکتانتها
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی


- Zeta potential of cellulose nanocrystals is explored as a function of additives.
- Hofmeister-type specific ion effects modulate ion adsorption.
- Surfactant adsorption can increase or reverse surface charge.
- Film roughness from cellulose nanocrystals depends on suspension zeta potential.

The zeta potential of cellulose nanocrystal (CNC) aqueous dispersions was studied as a function of solution conditions, including changing pH and different electrolyte identities and concentrations. A range of electrolytes that spans typical Hofmeister/hydrophobic effects was explored, along with both cationic and anionic surfactants. A subtle interplay of electrostatic and hydrophobic effects in ion adsorption was uncovered, including evidence of charge reversal and supercharging when hydrophobic surfactants are added to aqueous CNC dispersions. The apparent effects of zeta potential on dispersion stability were explored by using atomic force microscopy (AFM) to determine the roughness of resulting CNC films. The root mean square roughness (RMS) of these cellulose films was unaffected by the presence of surfactants (achieving a constant value of ∼9 nm), but scaled inversely and non-linearly with the zeta potential of the CNC suspension while using the ionic salts from ∼2 nm to 10 nm, indicating a facile method for the control of cellulose film roughness.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 509, 20 November 2016, Pages 11-18
نویسندگان
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