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.

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.

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

scholarly journals Improved Dynamic Light Scattering using an adaptive and statistically driven time resolved treatment of correlation data

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexander V. Malm ◽  
Jason C. W. Corbett
Keyword(s):  
Steady State ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Size Fraction ◽  
Power Relationship ◽  
Time Resolved ◽  
Size Fractions ◽  
Use Of Data ◽  
Primary Advantage ◽  
State Size

Abstract Dynamic Light Scattering (DLS) is a ubiquitous and non-invasive measurement for the characterization of nano- and micro-scale particles in dispersion. The sixth power relationship between scattered intensity and particle radius is simultaneously a primary advantage whilst rendering the technique sensitive to unwanted size fractions from unclean lab-ware, dust and aggregated & dynamically aggregating sample, for example. This can make sample preparation iterative, challenging and time consuming and often requires the use of data filtering methods that leave an inaccurate estimate of the steady state size fraction and may provide no knowledge to the user of the presence of the transient fractions. A revolutionary new approach to DLS measurement and data analysis is presented whereby the statistical variance of a series of individually analysed, extremely short sub-measurements is used to classify data as steady-state or transient. Crucially, all sub-measurements are reported, and no data are rejected, providing a precise and accurate measurement of both the steady state and transient size fractions. We demonstrate that this approach deals intrinsically and seamlessly with the transition from a stable dispersion to the partially- and fully-aggregated cases and results in an attendant improvement in DLS precision due to the shorter sub measurement length and the classification process used.

Time-Resolved Dynamic Light Scattering Study on the Dynamics of Silica Gels during Gelation Process

2000 ◽  
Vol 33 (3) ◽  
pp. 900-905 ◽  
Author(s):  
Tomohisa Norisuye ◽  
Masao Inoue ◽  
Mitsuhiro Shibayama ◽  
Ryo Tamaki ◽  
Yoshiki Chujo
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Silica Gels ◽  
Time Resolved ◽  
Gelation Process ◽  
Scattering Study
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