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DLVO theory
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==History== In 1923, [[Peter Debye]] and [[Erich Hückel]] reported the first successful theory for the distribution of charges in ionic solutions.<ref> {{Citation | last1=Debye | first1=P. | last2=Hückel | first2=E. | year=1923 | title=The theory of electrolytes. I. Lowering of freezing point and related phenomena | journal=Physikalische Zeitschrift | volume=24 | pages=185–206 }} </ref> The framework of linearized [[Debye–Hückel theory]] subsequently was applied to colloidal dispersions by S. Levine and G. P. Dube<ref> {{Citation | first=S. | last=Levine | title=Problems of stability in hydrophobic colloidal solutions I. On the interaction of two colloidal metallic particles. General discussion and applications | journal=Proceedings of the Royal Society of London A | volume=170 | issue=145 | pages=165 | year=1939 |bibcode = 1939RSPSA.170..165L |doi = 10.1098/rspa.1939.0024 | s2cid=94591277 | doi-access=}} </ref><ref> {{Citation | first1=S. | last1=Levine | first2=G. P. | last2=Dube | title=Interaction between two hydrophobic colloidal particles, using the approximate Debye-Huckel theory. I. General properties | journal=Transactions of the Faraday Society | volume=35 | pages=1125–1141 | year=1940 | doi=10.1039/tf9393501125 }} </ref> who found that charged colloidal particles should experience a strong medium-range repulsion and a weaker long-range attraction. This theory did not explain the observed instability of colloidal dispersions against irreversible aggregation in solutions of high ionic strength. In 1941, [[Boris Derjaguin]] and [[Lev Landau]] introduced a theory for the stability of colloidal dispersions that invoked a fundamental instability driven by strong but short-ranged van der Waals attractions countered by the stabilizing influence of electrostatic repulsions.<ref> {{Citation | first1=B. | last1=Derjaguin | first2=L. | last2=Landau | title=Theory of the stability of strongly charged lyophobic sols and of the adhesion of strongly charged particles in solutions of electrolytes | journal=Acta Physico Chimica URSS | volume=14 | pages=633 | year=1941 }} </ref> In 1948, [[Evert Verwey]] and [[Theodoor Overbeek|Theodor Overbeek]] independently arrived at the same result.<ref name="Verwey"> {{Citation | first1=E. J. W. | last1=Verwey | first2=J. Th. G. | last2=Overbeek | title=Theory of the stability of lyophobic colloids | journal=The Journal of Physical and Colloid Chemistry | publisher=Elsevier | location=Amsterdam | year=1948 | volume=51 | issue=3 | pages=631–6 | doi=10.1021/j150453a001 | pmid=20238663 | hdl=1874/16118 | hdl-access=free }} </ref> This so-called DLVO theory resolved the failure of the Levine–Dube theory to account for the dependence of colloidal dispersions' stability on the ionic strength of the electrolyte.<ref> {{Citation | first1=W. B. | last1=Russel | first2=D. A. | last2=Saville | first3=W. R. | last3=Schowalter | title=Colloidal Dispersions | publisher=Cambridge University Press | location=New York | year=1989 }} </ref>
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