Probing Nanometer-Thick Polyelectrolyte Layers Adsorbed on Oppositely Charged Particles by Dynamic Light Scattering

2010 ◽  
Vol 43 (21) ◽  
pp. 9108-9116 ◽  
Author(s):  
José Hierrezuelo ◽  
Istvan Szilagyi ◽  
Andrea Vaccaro ◽  
Michal Borkovec
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Charged Particles ◽  
Oppositely Charged

Heteroaggregation of oppositely charged particles in the presence of multivalent ions

2017 ◽  
Vol 19 (23) ◽  
pp. 15160-15171 ◽  
Author(s):  
Tianchi Cao ◽  
Takuya Sugimoto ◽  
Istvan Szilagyi ◽  
Gregor Trefalt ◽  
Michal Borkovec
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Charged Particles ◽  
Rate Coefficients ◽  
Time Resolved ◽  
Latex Particles ◽  
Multivalent Ions ◽  
Oppositely Charged

Time-resolved dynamic light scattering is used to measure absolute heteroaggregation rate coefficients and the corresponding stability ratios for heteroaggregation between amidine and sulfate charged latex particles.

Self-Aggregation of Mixtures of Oppositely Charged Polyelectrolytes and Surfactants Studied by Rheology, Dynamic Light Scattering and Small-Angle Neutron Scattering

Langmuir ◽  
2011 ◽  
Vol 27 (8) ◽  
pp. 4386-4396 ◽  
Author(s):  
Ingo Hoffmann ◽  
Peggy Heunemann ◽  
Sylvain Prévost ◽  
Ralf Schweins ◽  
Norman J. Wagner ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Oppositely Charged ◽  
Self Aggregation

scholarly journals Heteroaggregation and Homoaggregation of Latex Particles in the Presence of Alkyl Sulfate Surfactants

2020 ◽  
Vol 4 (4) ◽  
pp. 52
Author(s):  
Tianchi Cao ◽  
Michal Borkovec ◽  
Gregor Trefalt
Keyword(s):  
Light Scattering ◽  
Sodium Dodecyl Sulfate ◽  
Dynamic Light Scattering ◽  
Isoelectric Point ◽  
Sodium Dodecyl ◽  
Charge Reversal ◽  
Time Resolved ◽  
Latex Particles ◽  
A Charge ◽  
Oppositely Charged

Heteroaggregation and homoaggregation is investigated with time-resolved multi-angle dynamic light scattering. The aggregation rates are measured in aqueous suspensions of amidine latex (AL) and sulfate latex (SL) particles in the presence of sodium octyl sulfate (SOS) and sodium dodecyl sulfate (SDS). As revealed by electrophoresis, the surfactants adsorb to both types of particles. For the AL particles, the adsorption of surfactants induces a charge reversal and triggers fast aggregation close to the isoelectric point (IEP). The negatively charged SL particles remain negatively charged and stable in the whole concentration range investigated. The heteroaggregation rates for AL and SL particles are fast at low surfactant concentrations, where the particles are oppositely charged. At higher concentrations, the heteroaggregation slows down above the IEP of the AL particles, where the particles become like-charged. The SDS has higher affinity to the surface compared to the SOS, which induces a shift of the IEP and of the fast aggregation regime to lower surfactant concentrations.

scholarly journals Aggregation of Aqueous Kaolin Suspensions in the Presence of Cationic Polyelectrolytes, Anionic Polyelectrolytes and their Mixtures

2016 ◽  
Vol 18 (2) ◽  
pp. 117
Author(s):  
Zh.A. Lakhbayeva ◽  
R.S. Taubayeva ◽  
S.M. Tazhibayeva ◽  
A.A. Barany ◽  
K.B. Musabekov
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Relative Size ◽  
Cationic Polyelectrolyte ◽  
Particle Aggregation ◽  
Polymer Complex ◽  
Polymer Mixtures ◽  
Plateau Region ◽  
Oppositely Charged ◽  
Cationic Polyelectrolytes

The influence of anionic, cationic synthetic polyelectrolytes and their mixtures on the aggregation of kaolin hydrosuspension has been studied by means of spectrophotometry, electrophoresis and dynamic light scattering (DLS). An enhancement of the flocculating property of the cationic polyelectrolyte FO 4650 in accordance with its consumption increases from 0.77 mg/g to 7.7 mg/g has been found. At these conditions the relative size of floccules (R) increases from 1.0 to 13.0. The increase of the flocculating property accordingly to the increasing charge of anionic polyelectrolyte is observed in mixtures of cationic and anionic polyelectrolytes. The time dependences of R in presence of the weakly charged cationic polyelectrolyte mixtures reach a plateau region. This can be associated with the formation of electrostatic contacts between the solid surface and the polymer mixtures, as well as with stabilizing equilibrium conformation of macromolecules. It has been found that mixtures of oppositely charged polyelectrolytes lead to more efficient aggregation of particles than individual polyelectrolytes. This process is enhanced by the introduction primarily of the cationic polyelectrolyte and then the anionic one (R = 6‒10). Use of the pre-formulated mixtures of polymers leads to the marked increase in degree of particle aggregation (R = 12). The reason is an interaction of kaolin particles with inter-polymer complex formed by electrostatic attraction of oppositely charged polyelectrolytes.

Dynamic light scattering from gels in a poor solvent

1978 ◽  
Vol 39 (9) ◽  
pp. 955-960 ◽  
Author(s):  
E. Geissler ◽  
A.M. Hecht
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Poor Solvent

DYNAMIC LIGHT SCATTERING IN LC-440 NEMATIC LIQUID CRYSTAL

2014 ◽  
Vol 73 (11) ◽  
pp. 977-983
Author(s):  
A. P. Fedoryako ◽  
A. I. Kocherzhin ◽  
M. P. Kukhtin ◽  
E. I. Chernyakov
Keyword(s):  
Liquid Crystal ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Nematic Liquid Crystal
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