scholarly journals Interaction of Polyoxometalates and Nanoparticles with Collector Surfaces—Focus on the Use of Streaming Current Measurements at Flat Surfaces

2020 ◽  
Vol 4 (3) ◽  
pp. 39
Author(s):  
Johannes Lützenkirchen ◽  
Gopala Krishna Darbha ◽  
Venkata Sai Kiran Chakravadhanula ◽  
Engelbert Redel ◽  
Atiđa Selmani ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Surface Interactions ◽  
Mutual Interaction ◽  
Innovative Approach ◽  
Potential Curve ◽  
Natural Environments ◽  
Post Mortem ◽  
Tio2 Nps ◽  
Flat Surfaces ◽  
Streaming Current

Streaming current measurements were used to study the interaction of polyoxometalates (POMs) and nanoparticles (NPs) with flat surfaces as an alternative, innovative approach to infer POM and NP properties of potential sparse material in terms of charge and magnitude. With respect to POMs, the approach was able to reveal subtle details of charging properties of +7 vs. +8 charge at very low POM concentrations. For NPs, the sign of charge and even the zeta-potential curve was retrieved. Concerning NPs, mutual interaction between TiO2 and SiO2 surfaces was studied in some detail via macroscopic measurements. Post-mortem analysis of samples from electrokinetic studies and separate investigations via AFM and HRTEM verified the interactions between TiO2 NPs and SiO2 collector surfaces. The interactions in the SiO2/TiO2 system depend to some extent on NP morphology, but in all our systems, irreversible interactions were observed, which would make the studied types of NPs immobile in natural environments. Overall, we conclude that the measurement of streaming currents at flat surfaces is valuable (i) to study NP and POM collector surface interactions and (ii) to simultaneously collect NPs or POM (or other small mobile clusters) for further (structural, morphological or release) investigations.

How to use alum with cationic dispersed rosin size

TAPPI Journal ◽  
2016 ◽  
Vol 15 (5) ◽  
pp. 331-335 ◽  
Author(s):  
LEBO XU ◽  
JEREMY MYERS ◽  
PETER HART
Keyword(s):  
Zeta Potential ◽  
Colloidal Particles ◽  
Streaming Potential ◽  
Excessive Amount ◽  
Paper Machine ◽  
Optimum Amount ◽  
Potential Measurement ◽  
Streaming Current ◽  
Wide Range ◽  
Laboratory Results

Retention of cationic dispersed rosin size was studied via turbidity measurements on stock filtrate with different alum and dispersed rosin size dosages. Stock charge characteristics were analyzed using both an analysis of charge demand determined via a streaming current detector and an evaluation of zeta potential of the fibers by streaming potential measurement. The results indicated that an optimum amount of alum existed such that good sizing retention was maintained throughout a wide range of dispersed rosin size dosages. However, when an excessive amount of alum was used and fines and colloidal particles were transitioned from anionic to cationic, the cationic size retention was reduced. Laboratory results were confirmed with a paper machine trial. All data suggested that a stock charge study was necessary to identify optimal alum dosage for a cationic dispersed rosin sizing program.

Electrokinetic Potential for Characterization of Nanosctructured Solid Flat Surfaces

2013 ◽  
Vol 25 ◽  
pp. 31-39 ◽  
Author(s):  
Zdeňka Kolská ◽  
Nikola Slepičková Kasálková ◽  
Jakub Siegel ◽  
Václav Švorčík
Keyword(s):  
Zeta Potential ◽  
Isoelectric Point ◽  
Electrokinetic Potential ◽  
Characteristic Parameter ◽  
Metal Nanostructures ◽  
Gold Deposition ◽  
Fast Analysis ◽  
Flat Surfaces ◽  
Acceptable Method ◽  
Point Determination

Electrokinetic potential (zeta potential) is a characteristic parameter for description of the surface chemistry of solid flat materials and it can be used for a fast analysis of materials modified by different chemical or physical methods. Due to its sensitivity, zeta potential is able to distinguish surface modified by coating with monolayers of various materials or nanostructures created after plasma treatment. Also metal nanostructures deposited on surfaces can be characterized by zeta potential. It can also be used for isoelectric point determination of materials. We present data on zeta potential in 0.001 mol/dm3 KCl at constant pH7.0 and also in pH range (2.5-7.0) for isoelectric point determination for pristine polymers PET, PTFE, PS, LDPE, HDPE, PLLA, PVF, PVDF, PMP and polyimides (Upilex R, Upilex S, Kapton). The zeta potential of selected polymers, modified by plasma and by chemical coatings (e.g. by biphenyldithiol or polyethyleneglycol) or by gold deposition was measured too. Zeta potentials of these modified materials were also studied to confirmation that electrokinetic analysis is acceptable method for their fast description.

The Determination of Electrokinetic Coupling-Coefficient and Zeta Potential of Rock Samples by Electrokinetic Measurements

2012 ◽  
Vol 516-517 ◽  
pp. 1870-1873 ◽  
Author(s):  
Jun Wang ◽  
Heng Shan Hu
Keyword(s):  
Zeta Potential ◽  
Coupling Coefficient ◽  
Streaming Potential ◽  
Potential Method ◽  
Surface Conductivity ◽  
Reliable Estimate ◽  
Surface Conductance ◽  
Streaming Current ◽  
Low Concentrations

The electrokinetic effects are important in the understanding of electric properties in porous medium. In this study, the streaming potential and streaming current of saturated samples are measured at different concentrations, then three methods are applied to obtain the zeta-potential and electrokinetic coupling coefficient. The study shows that the results obtained from streaming potential and streaming current methods agree well with each other, but the results obtained from simplified streaming potential method become seriously inaccurate at low concentrations due to the influence of surface conductance. This experimental study also provides a reliable estimate of the surface conductivity and its contribution to zeta-potential at given concentrations.

scholarly journals Microscale Zeta Potential Evaluation Using Streaming Current Measurements

2001 ◽  
Author(s):  
E R Hasselbrink, Jr ◽  
M C Hunter ◽  
W R Even, Jr ◽  
J A Irvin
Keyword(s):  
Zeta Potential ◽  
Streaming Current ◽  
Potential Evaluation

Study of the zeta potential and streaming current of ultrafiltration membranes in contact with an anionic surfactant

2014 ◽  
Vol 56 (13) ◽  
pp. 3456-3462 ◽  
Author(s):  
Liliana Villafaña-López ◽  
Mario Ávila-Rodríguez ◽  
M. Pilar González-Muñoz
Keyword(s):  
Zeta Potential ◽  
Anionic Surfactant ◽  
Ultrafiltration Membranes ◽  
Streaming Current

The zeta potential of extended dielectrics and conductors in terms of streaming potential and streaming current measurements

2012 ◽  
Vol 14 (27) ◽  
pp. 9758 ◽  
Author(s):  
Amparo M. Gallardo-Moreno ◽  
Virginia Vadillo-Rodríguez ◽  
Julia Perera-Núñez ◽  
José M. Bruque ◽  
M. Luisa González-Martín
Keyword(s):  
Zeta Potential ◽  
Streaming Potential ◽  
Streaming Current

Measurement of the Streaming Potential and Streaming Current near a Rotating Disk to Determine Its Zeta Potential

Langmuir ◽  
2005 ◽  
Vol 21 (16) ◽  
pp. 7433-7438 ◽  
Author(s):  
James D. Hoggard ◽  
Paul J. Sides ◽  
Dennis C. Prieve
Keyword(s):  
Zeta Potential ◽  
Streaming Potential ◽  
Rotating Disk ◽  
Streaming Current

Stability Analysis of Nano-Sized Titanium Dioxide in Aqueous Environment

2011 ◽  
Vol 374-377 ◽  
pp. 869-874 ◽  
Author(s):  
Xiao Nan Yang ◽  
Fu Yi Cui ◽  
Xiao Ying Mu ◽  
Zhi Wei Zhao
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Zeta Potential ◽  
Ph Value ◽  
Electrostatic Force ◽  
High Dispersion ◽  
Aqueous Environment ◽  
Tio2 Nps ◽  
The Stability ◽  
The Impact

Nano-sized titanium dioxide in aquatic environment poses potential impact on environment and human health. In this research, the impact of pH value, humic acid (HA) and divalent cations (Ca2+) on the stability of titanium dioxide nanoparticles(NPs) in the aqueous enviorment was investigated using a batch test. The results showed that the particle size of TiO2 NPs was not sensitive to the pH value but presented inversely proportional to zeta potential. The TiO2 NPs become more stable along with surface zeta potential, accompany with small particle size and high dispersion. In the presence of HA, the particle size was smaller and TiO2 NPs could be stabilized. This might be synergistic effect of the ligand exchange and electrostatic force. Meanwhile, NPs particle size increased with the addition of Ca2+ and the stability of TiO2 NPs became decreased.

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