In-situ investigation of adsorbed surfactants and polymers on solids in solution

Somasundaran, P.; Kunjappu, Joy T.

doi:10.1016/0166-6622(89)80123-4

Cited by 102 publications

(66 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental observations suggest that PHS exhibits protective effects at concentrations above 20 μg/ml, which is in the same order of magnitude as the critical micelle concentration reported for PHS [Veerman et al, 2010]. It is well known that adsorption of surfactants on solid-liquid interfaces increases in a cooperative way at concentrations in the range of the critical micelle concentration and levels off at further increase in concentration [Somasundaran and Kunjappu, 1989]. Below the critical micelle concentration protection rapidly decreases, suggesting that less dense layers of PHS are less effective in protection ( fig.…”

Section: Discussionsupporting

confidence: 62%

Sphingoid Bases Inhibit Acid-Induced Demineralization of Hydroxyapatite

Valentijn-Benz

Hof²,

Bikker³

et al. 2014

Caries Res

View full text Add to dashboard Cite

Calcium hydroxyapatite (HAp), the main constituent of dental enamel, is inherently susceptible to the etching and dissolving action of acids, resulting in tooth decay such as dental caries and dental erosion. Since the prevalence of erosive wear is gradually increasing, there is urgent need for agents that protect the enamel against erosive attacks. In the present study we studied in vitro the anti-erosive effects of a number of sphingolipids and sphingoid bases, which form the backbone of sphingolipids. Pretreatment of HAp discs with sphingosine, phytosphingosine (PHS), PHS phosphate and sphinganine significantly protected these against acid-induced demineralization by 80 ± 17%, 78 ± 17%, 78 ± 7% and 81 ± 8%, respectively (p < 0.001). On the other hand, sphingomyelin, acetyl PHS, octanoyl PHS and stearoyl PHS had no anti-erosive effects. Atomic force measurement revealed that HAp discs treated with PHS were almost completely and homogeneously covered by patches of PHS. This suggests that PHS and other sphingoid bases form layers on the surface of HAp, which act as diffusion barriers against H⁺ ions. In principle, these anti-erosive properties make PHS and related sphingosines promising and attractive candidates as ingredients in oral care products. © 2014 S. Karger AG, Basel

show abstract

Section: Discussionsupporting

confidence: 62%

Sphingoid Bases Inhibit Acid-Induced Demineralization of Hydroxyapatite

Valentijn-Benz

Hof²,

Bikker³

et al. 2014

Caries Res

View full text Add to dashboard Cite

show abstract

“…Numerous investigations have focused on adsorption of ionic surfactants on oppositely charged particle surfaces. Such adsorption has been studied extensively by Somasundaran and Feurstenau (4), Gaudin and Feurstenau (5), and Somasundaran and Kunjappu (6), primarily for the system of sodium dodecyl sulfate (SDS) on alumina particles.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of High Ionic Strength Slurries Using Surfactant Mixtures: Molecular Factors That Determine Optimal Stability

Palla

Shah

2002

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…It has been shown that the desorption of TTAC from the alumina-water interface was reversible at high concentrations but was irreversible at lower concentrations. This was attributed to changes in the structure of the adsorbed layer upon dilution and the activation energy needed for the formation of surfactant solliodal aggregates (22).…”

Section: Resultsmentioning

confidence: 99%