Zeta Potential of Ion-Conductive Membranes by Streaming Current Measurements

Xie, He‐Lou; Saito, Tomonori; Hickner, Michael A.

doi:10.1021/la105120f

Cited by 92 publications

(60 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 1 gives the physical properties of lubricants (LB104 ILs with MLG). The zeta potential is a key parameter indicating the dispersions of charged particle, which depends on the potential difference between the dispersion medium and the stationary layer of fluid attached to the dispersed particle [37]. The magnitude of the zeta potential illustrates the degree of electrostatic repulsion between adjacent charged particles in a dispersion system.…”

Section: Results and Analysis Of The Lubricantmentioning

confidence: 99%

In Situ Fabrication of Low-Friction Sandwich Sheets Through Functionalized Graphene Crosslinked by Ionic Liquids

Fan

Wang

2015

Tribol Lett

View full text Add to dashboard Cite

Graphene is considered a wonder material for fundamental research and industrial application, whereas its poor dispersibility and incompatibility in lubricants have impeded the application for solving lubrication problems. Here, in situ fabrication of effectively functionalized graphene sheets was developed through a moderate electrochemical method for exfoliating graphite into graphene sheets in ionic liquids solution. The as-fabricated graphene sheets with the charged groups of ionic liquids (ILs) could be self-assembled together to form the multilayer sandwich structure through the electrostatic interaction. Self-assembly multilayer graphene (MLG) exhibits so high-density coverage of functional groups that some amorphous regions are formed on the graphene basal plane, which significantly improves its dispersibility and stability in ILs lubricant. Moreover, the functionalized MLG as a novel lubricant additive greatly enhances the friction-reducing and antiwear abilities for the contact of steel/steel (friction coefficient and wear volume lubricated by ILs with MLG at applied load of 200 N and 150°C were reduced by up to 55.9 and 84.2 %, and under high vacuum were reduced by up to 36 and 94.3 % with pure ILs as a comparison, respectively), which is attributed to the synergies of ILs and MLG because ILs with functionalized MLG can form the physical adsorptive film and tribo-chemical reaction film on the rubbing surface during friction process.

show abstract

Section: Results and Analysis Of The Lubricantmentioning

confidence: 99%

In Situ Fabrication of Low-Friction Sandwich Sheets Through Functionalized Graphene Crosslinked by Ionic Liquids

Fan

Wang

2015

Tribol Lett

View full text Add to dashboard Cite

show abstract

“…The electrolyte solution flowed, in alternating directions, along the slit composed of the two parallel surfaces covered by the membrane samples. This flow of electrolyte solution generated streaming potentials from which the zeta potential of the membrane surface was calculated using the Helmholtz-Smoluchowski equation [54,55]. The electrolyte solution was 1 mM KCl and the pH was automatically adjusted by the addition of KOH and HCl.…”

Section: Membrane Zeta Potential Measurementmentioning

confidence: 99%

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Wang

Jin

Hou

et al. 2016

Journal of Membrane Science

128

View full text Add to dashboard Cite

a b s t r a c tThe efforts of developing anti-oil-fouling membranes have so far been focusing on tailoring membrane surface wetting properties, whereas the impacts of surface charge are often eclipsed. In this study, we investigated the impacts of surface charge and wetting property on oil fouling kinetics in membrane distillation (MD). Two composite membranes with in-air hydrophilic and underwater oleophobic surfaces, one of positive charge and the other of negative charge, were fabricated by modifying a hydrophobic polyvinylidene fluoride (PVDF) membrane with hydrophilic polyelectrolytes with different charges. The modified composite membranes were compared with the reference PVDF membrane for their contact angles, adhesion force curves, and fouling kinetics in MD processes. It was found that the negatively charged composite membrane performed the best in mitigating fouling by the negatively charged oil emulsion, followed by the positively charged composite membrane, with the pristine PVDF membrane being the most susceptible to oil fouling in MD experiments. The results from underwater oil CA measurements and oil probe force spectroscopy corroborated the results in the fouling experiments. The impact of surface charges on oil-membrane interaction and associated mechanism were also discussed.

show abstract

“…In contrast, the streaming potential method can be used for materials with much larger dimensions and thus complex pretreatment of materials is not required. Streaming potential measurements have been widely used to characterize charged materials such as membranes (Lawrence et al 2006;Xie et al 2011), hollow fibers (Lanteri et al 2012), natural fibers (Hubbe et al 2007; Wang and Hubbe 2001) and porous materials (Sheffer et al 2007). The zeta potential at the root surfaces of plants is likely to be adequately calculated from streaming potential because of the large and fiber-like dimensions of roots.…”

Section: Introductionmentioning

confidence: 99%

Zeta potential at the root surfaces of rice characterized by streaming potential measurements

Liu

Zheng

et al. 2014

Plant Soil

View full text Add to dashboard Cite

Aim Our objective was to determine the in situ zeta potential at the root surfaces of rice. Methods A streaming potential apparatus made in our laboratory was used to measure zeta potential at the root surfaces.Results Zeta potential at the root surfaces could be calculated from streaming potential measured by the apparatus, and the measurements of streaming potential had good stability, reproducibility and accuracy. Ionic strength, electrolyte type, pH influenced the zeta potentials, with being consistent with theoretical calculations. The absolute value of the zeta potential at the root surfaces decreased with increasing ionic strength due to compression of diffuse layer of the electric double layer. Cations had much greater impact on zeta potential than anions due to the electrostatic attraction of cations by the negatively charged root surfaces and electrostatic repulsion of anions. The effects of different cations on the zeta potential followed the order: Al 3+ >H + >Cu 2+ > Mg 2+ ≈Ca 2+ >K + ≈Na + . The zeta potential of root surfaces became more negative with increasing pH due to deprotonation of functional groups on roots. Conclusions Streaming potential measurement is a novel method that can be used to calculate zeta potential of root surfaces.

show abstract

Zeta Potential of Ion-Conductive Membranes by Streaming Current Measurements

Cited by 92 publications

References 33 publications

In Situ Fabrication of Low-Friction Sandwich Sheets Through Functionalized Graphene Crosslinked by Ionic Liquids

In Situ Fabrication of Low-Friction Sandwich Sheets Through Functionalized Graphene Crosslinked by Ionic Liquids

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

Zeta potential at the root surfaces of rice characterized by streaming potential measurements

Contact Info

Product

Resources

About