Colloidal
systems, including micellar and reverse micellar mixtures,
are essential for a variety of natural transport processes, such as
the flow of organic and inorganic contaminants in lakes, rivers, and
underground fissures. Thus, an understanding of their structure and
stability is important for prediction of their behavior in complex
environments. Previous experiments have shown that the solvodynamic
diameters (D) of reverse micelles contract linearly
with increased concentrations of salts such as NaBH4, FeSO4, Mg(NO3)2, CuCl2, Al(NO3)3, Fe(NO3)3, and Y(NO3)3. It has also been previously determined that
reverse micelle size is a function of cation valency, through the
Debye screening length (κ–1), and of anion
hydrated radius. Here, we present a new theoretical model for the
aqueous reverse micelle core substructure in water/AOT/isooctane colloidal
systems with added salts. Our model is based on electrical double
layer (EDL) theory and assumes ions are evenly distributed within
the reverse micelle water core. We further analyze reverse micelle
size with respect to ion hydration, reverse micelle water dynamics,
and ion distribution, to propose a mechanism for reverse micelle contraction
and determine the cause of system instability at the critical destabilization
concentration for each salt. We find that destabilization occurs when
the interfacial core water and waters needed for complete ion hydration
exceed the water contained within the reverse micelle at its stable
size. This establishes ion hydration capacity a likely primary mechanism
for reverse micelle destabilization.
Introduction: Root coverage procedures are not always predictable, and outcomes depend on several factors. This technique provides a predictable alternative to managing facial gingival recessions. Case Series: A new grafting technique is introduced that requires no incisions at the recipient site, thereby preserving the integrity of the local blood supply to optimize the healing process. The graft is placed through the gingival sulcus via a molar or canine access (MOCA) approach, and there is minimal tension on the coronally advanced flap through use of suspension sutures. Thirteen nonsmoking patients, between the ages of 27 and 57, with Cairo RT1 facial recession were studied, with a follow-up period of 1-60 weeks. This paper explains the step-by-step technique and highlights 13 cases. Conclusion: Complete root coverage was achieved in all 13 cases, although one case showed initial altered healing. While MOCA is technique sensitive, it provides optimal root coverage results. With no incisions at the recipient site, there is no uneven texture or scar formation, and healing proceeds with minimal interruption.
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