Electrokinetic Potential for Characterization of Nanosctructured Solid Flat Surfaces

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.

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Rapid Isoelectric Point Determination in a Miniaturized Preparative Separation Using Jet-Dispensed Optical pH Sensors and Micro Free-Flow Electrophoresis

Analytical Chemistry ◽

10.1021/ac501783r ◽

2014 ◽

Vol 86 (19) ◽

pp. 9533-9539 ◽

Cited By ~ 23

Author(s):

Christin Herzog ◽

Erik Beckert ◽

Stefan Nagl

Keyword(s):

Isoelectric Point ◽

Free Flow ◽

Preparative Separation ◽

Ph Sensors ◽

Optical Ph Sensors ◽

Point Determination ◽

Micro Free Flow Electrophoresis

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Compost leachate treatment using polyaluminium chloride and nanofiltration

Open Chemistry ◽

10.1515/chem-2017-0015 ◽

2017 ◽

Vol 15 (1) ◽

pp. 123-128 ◽

Cited By ~ 2

Author(s):

Marjana Simonič

Keyword(s):

Zeta Potential ◽

Isoelectric Point ◽

Oxygen Demand ◽

Treatment Method ◽

Aluminium Chloride ◽

Leachate Treatment ◽

Physico Chemical ◽

Pre Treatment ◽

Ph Range ◽

Compost Leachate

AbstractLaboratory scale filtration tests utilizing leachate were conducted to investigate fouling and filtration performance of nanofiltration membranes. The work presented in this study is conducted on real samples rather than model water. Physico-chemical analyses showed that the leachate contained a lot of organic substances, exceeding 20000 mg/L O2 expressed as chemical oxygen demand. Proper pre-treatment method must be chosen in order to reduce fouling index. Coagulation pre-treatment using poly-aluminium chloride was chosen. Two thin film polysulfone membranes were used, purchased by Osmonic Desal. The focus of this research is to assess the influence of the particle size and zeta-potential of the colloidal fraction in leachate on nanofiltration performance. The isoelectric point of both membranes was 4.7 and 4.3, respectively. The fouled membranes were negatively charged over the pH range with isoelectric point shifting to the left (lower pH) indicating the foulant material mainly not charged. It was confirmed by its zeta-potential, measured at -2 mV.

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Zeta potential of membranes as a function of pH Optimization of isoelectric point evaluation

Journal of Membrane Science ◽

10.1016/s0376-7388(02)00530-6 ◽

2003 ◽

Vol 213 (1-2) ◽

pp. 225-230 ◽

Cited By ~ 37

Author(s):

A Martín

Keyword(s):

Zeta Potential ◽

Isoelectric Point ◽

Point Evaluation ◽

Ph Optimization

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STUDY OF BETULIN STABILITY BY ELECTROKINETIC POTENTIAL DETERMINATION

Леса России и хозяйство в них ◽

10.51318/fret.2021.68.16.008 ◽

2021 ◽

pp. 63-67

Author(s):

Г.И. Мальцев

Keyword(s):

Aqueous Solution ◽

Zeta Potential ◽

Food Industry ◽

Colloidal Particle ◽

Electrokinetic Potential ◽

Energy Costs ◽

Particle Charge ◽

The Stability ◽

Time And Energy ◽

Biological Actions

Исследование стабильности бетулина методом определения электрокинетического потенциала. На сегодняшний день бетулин интересен в области медицины, косметики и пищевой промышленности, ведь он обладает огромным спектром биологических действий. Из него можно получить производные, которые, в свою очередь, имеют определенное хорошо выраженное действие и используются для производства различных медикаментов. И чтобы интенсифицировать процесс очистки и фильтрования бетулина для экономии времени и затрат на энергию, необходимо узнать его заряд коллоидной частицы и стабильность в водном растворе. Для этого было проведено определение электрокинетического потенциала. Найден ξ-потенциал бетулина в водном растворе, который показал, что с увеличением концентрации водного раствора бетулина вероятность разрушения дисперсии и возможность образования хлопьев при добавлении коагулянта или флогулянта повышаются. Определен заряд поверхности коллоидной частицы бетулина. Investigation of the stability of betulin by the method of determining the electrokinetic potential.Today betulin is interesting in the field of medicine, cosmetics and food industry, because it has a huge range of biological actions. From it, you can get derivatives, which in turn have a certain well-defined effect and are used for the production of various medicines. In order to intensify the process of cleaning and filtering betulin to save time and energy costs, we need to know its colloidal particle charge and stability in an aqueous solution. To do this, we conducted a method for determining the electrokinetic potential. we determined the zeta potential of betulin in an aqueous solution, which showed that with an increase in the concentration of betulin in water, the probability of destruction of the dispersion and the possibility of flocculation when adding a coagulant or flogulant increases. We determined the surface charge of a colloidal betulin particle.

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Isoelectric point determination of human and camel β-endorphin, α-endorphin and enkephalins

Biochemical and Biophysical Research Communications ◽

10.1016/0006-291x(82)90676-3 ◽

1982 ◽

Vol 104 (2) ◽

pp. 577-582 ◽

Cited By ~ 8

Author(s):

Angela Santagostino ◽

Gabriella Giagnoni ◽

Pietro Fumagalli ◽

Daniela Pavesi ◽

Enrica Torretta

Keyword(s):

Isoelectric Point ◽

Point Determination

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Isoelectric point determination of cardiac troponin I forms present in plasma from patients with myocardial infarction

Clinica Chimica Acta ◽

10.1016/j.cca.2006.10.006 ◽

2007 ◽

Vol 377 (1-2) ◽

pp. 243-247 ◽

Cited By ~ 16

Author(s):

Estelle Peronnet ◽

Laurence Becquart ◽

Jérôme Martinez ◽

Jean-Philippe Charrier ◽

Colette Jolivet-Reynaud

Keyword(s):

Myocardial Infarction ◽

Isoelectric Point ◽

Cardiac Troponin ◽

Troponin I ◽

Cardiac Troponin I ◽

Point Determination

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Direct isoelectric point determination of antigens by a new quantitative immunoelectrophoretic method

Electrophoresis ◽

10.1002/elps.1150040307 ◽

1983 ◽

Vol 4 (3) ◽

pp. 224-227 ◽

Cited By ~ 2

Author(s):

Ronald M. F. Guinet

Keyword(s):

Isoelectric Point ◽

Point Determination

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Formation mechanism of spherical oxide particles containing dye

Journal of Materials Research ◽

10.1557/jmr.1999.0281 ◽

1999 ◽

Vol 14 (5) ◽

pp. 2088-2091

Author(s):

Sixin Wu ◽

Congshan Zhu

Keyword(s):

Particle Size ◽

Zeta Potential ◽

Formation Mechanism ◽

Isoelectric Point ◽

Sol Gel ◽

Diameter Distribution ◽

Maximum Particle Size ◽

Maximum Particle ◽

Oxide Particles ◽

Positively Charged

2-[3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidine)-1-propenyl]-1,3,3-trimethyl-3H-indolium idoide (HICI) dye-doped SiO2 particles were synthesized by sol-gel method. Dimension, diameter, distribution, and homogeneity of the particles are closely related to the positively charged dye concentration, corresponding to the zeta potential of the particles. When the dye concentration reaches about 7.8 × 10−4 mol/mol SiO2, corresponding to the isoelectric point of the particles, the maximum particle size and the most homogeneity can be reached.

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