Dynamic light scattering study of intrinsic colloids of tetravalent actinides

2009 ◽  
Vol 1193 ◽  
Author(s):  
Sumit Kumar ◽  
B.S. Tomar ◽  
V.K. Manchanda

AbstractKinetics of formation of intrinsic colloids by tetravelent metal ions, namely, Th(IV), Hf(IV) and Pu(IV) have been studied using the dynamic light scattering technique. The milli-molar solutions of Hf(IV) and Th(IV) were prepared at varying pH (2-4) and ionic strength (0-0.01 M) and the samples were subjected to dynamic light scattering measurements at regular intervals for few days. The results showed that the size of intrinsic colloids varies with pH and ionic strength. In the case of Pu(IV) the concentration of aqueous solutions was 4.5×10−5 M.

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 591
Author(s):  
Rūta Ivanec-Goranina

The kinetics of fungal peroxidase-catalyzed 2-hydroxyanthracene and 9-phenanthrol oxidation was investigated in presence of biosurfactant escin at pH 5.5 and 25 °C. The kinetic measurements were performed using the fluorimetric method and the critical micelle concentration (CMC) of escin was determined using the dynamic light scattering technique. Inactivation of peroxidase was observed in absence of biosurfactant escin. It was shown that escin, used in concentrations lower than CMC, decreases or completely stops the peroxidase inactivation and increases the conversion of 2-hydroxyanthracene as well as of 9-phenanthrol. The environmentally friendly method of peroxidase-catalyzed 2-hydroxyanthracene and 9-phenanthrol oxidation in presence of biosurfactant Escin has an advantage over traditional decontamination methods due to their less environmental impact.


Langmuir ◽  
1999 ◽  
Vol 15 (13) ◽  
pp. 4678-4681 ◽  
Author(s):  
Olga López ◽  
Mercedes Cócera ◽  
Ramón Pons ◽  
Nuria Azemar ◽  
Carmen López-Iglesias ◽  
...  

2007 ◽  
Vol 101 (2) ◽  
pp. 239-253 ◽  
Author(s):  
Richard C. Murdock ◽  
Laura Braydich-Stolle ◽  
Amanda M. Schrand ◽  
John J. Schlager ◽  
Saber M. Hussain

2013 ◽  
Vol 34 (4) ◽  
pp. 566-574 ◽  
Author(s):  
Jolanta Cieśla ◽  
Andrzej Bieganowski ◽  
Jolanta Narkiewicz-Michałek ◽  
Marta Szymula

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