scholarly journals Correlation between Colloidal Stability and Surfactant Adsorption/Association Phenomena Studied by Light Scattering

2008 ◽  
Vol 112 (7) ◽  
pp. 1976-1986 ◽  
Author(s):  
Alessio Zaccone ◽  
Hua Wu ◽  
Marco Lattuada ◽  
Massimo Morbidelli
Keyword(s):  
Light Scattering ◽  
Colloidal Stability ◽  
Surfactant Adsorption

scholarly journals Correlation between Colloidal Stability and Surfactant Adsorption/Association Phenomena Studied by Light Scattering

2008 ◽  
Vol 112 (21) ◽  
pp. 6733-6733 ◽  
Author(s):  
Alessio Zaccone ◽  
Hua Wu ◽  
Marco Lattuada ◽  
Massimo Morbidelli
Keyword(s):  
Light Scattering ◽  
Colloidal Stability ◽  
Surfactant Adsorption

scholarly journals PEGylation of Superparamagnetic Iron Oxide Nanoparticles with Self-Organizing Polyacrylate-PEG Brushes for Contrast Enhancement in MRI Diagnosis

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 776 ◽  
Author(s):  
Erzsébet Illés ◽  
Márta Szekeres ◽  
Ildikó Tóth ◽  
Katalin Farkas ◽  
Imre Földesi ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Colloidal Stability ◽  
Serum Proteins ◽  
Electrokinetic Potential ◽  
Blood Compatibility ◽  
Superparamagnetic Iron Oxide ◽  
Protein Corona ◽  
Superparamagnetic Nanoparticles ◽  
Mri Diagnosis

For biomedical applications, superparamagnetic nanoparticles (MNPs) have to be coated with a stealth layer that provides colloidal stability in biological media, long enough persistence and circulation times for reaching the expected medical aims, and anchor sites for further attachment of bioactive agents. One of such stealth molecules designed and synthesized by us, poly(polyethylene glycol methacrylate-co-acrylic acid) referred to as P(PEGMA-AA), was demonstrated to make MNPs reasonably resistant to cell internalization, and be an excellent candidate for magnetic hyperthermia treatments in addition to possessing the necessary colloidal stability under physiological conditions (Illés et al. J. Magn. Magn. Mater. 2018, 451, 710–720). In the present work, we elaborated on the molecular background of the formation of the P(PEGMA-AA)-coated MNPs, and of their remarkable colloidal stability and salt tolerance by using potentiometric acid–base titration, adsorption isotherm determination, infrared spectroscopy (FT-IR ATR), dynamic light scattering, and electrokinetic potential determination methods. The P(PEGMA-AA)@MNPs have excellent blood compatibility as demonstrated in blood sedimentation, smears, and white blood cell viability experiments. In addition, blood serum proteins formed a protein corona, protecting the particles against aggregation (found in dynamic light scattering and electrokinetic potential measurements). Our novel particles also proved to be promising candidates for MRI diagnosis, exhibiting one of the highest values of r2 relaxivity (451 mM−1s−1) found in literature.

The colloidal stability of variable-charge mineral suspensions

Clay Minerals ◽  
1987 ◽  
Vol 22 (1) ◽  
pp. 93-107 ◽  
Author(s):  
F. Bartoli ◽  
R. Philippy
Keyword(s):  
Light Scattering ◽  
Rayleigh Scattering ◽  
Colloidal Stability ◽  
Aggregate Size ◽  
Point Of Zero Charge ◽  
Diffraction Scattering ◽  
Variable Charge ◽  
Alumina Gel ◽  
Mineral Suspensions ◽  
Scattering Index

AbstractA method of analysing the colloidal stability of variable-charge mineral suspensions as a function of pH is described, which combines light scattering with soluble element and surface charge measurements. The absorbance of the suspensions closely follows the A = k−m equation, where m = −dlgA/dlgλ is an aggregate light-scattering index which is inversely related to the limiting sedimentation speed v = dA600nm/dt. Usually, suspensions of variable-charge minerals scatter less near their point of zero charge where the aggregation process is a maximum, in contrast to environments where they are charged and well-dispersed. Although the morphology of goethite is that of elongated needles, kaolinite plates, and imogolite tubes, the coalesced sphere approach of the Mie theory allows rapid correlation of the absorbance at 600 nm with aggregate-size distribution, indirectly measured by the light- scattering aggregate-size index m confirmed by electron microscopy experiments. Kaolinite and goethite suspensions obey the diffraction scattering law with a variation in size of 2–20 µm from the dispersed to the aggregated particles. Imogolite and alumina gel suspensions possibly obey the anomalous diffraction scattering law and are present as 0·05–1 µm aggregates of their 50–100 Å structural units. Silica gel and the more dispersed imogolite suspensions possibly obey the anomalous Rayleigh scattering law with a variation of aggregate size from 700–3000 Å.

scholarly journals EVALUATION OF SILICA NANOPARTICLE COLLOIDAL STABILITY WITH A FIBER OPTIC QUASI-ELASTIC LIGHT SCATTERING SENSOR

2019 ◽  
Vol 36 (4) ◽  
pp. 1519-1534 ◽  
Author(s):  
Marco César Prado Soares ◽  
Matheus Kauê Gomes ◽  
Egont Alexandre Schenkel ◽  
Matheus dos Santos Rodrigues ◽  
Carlos Kenichi Suzuki ◽  
...  
Keyword(s):  
Light Scattering ◽  
Colloidal Stability ◽  
Fiber Optic ◽  
Silica Nanoparticle ◽  
Elastic Light Scattering
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