geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Temperature-dependent phase transition and desorption free energy of sodium dodecyl sulfate at the water/vapor interface: approaches from molecular dynamics simulations


, : Temperature-dependent phase transition and desorption free energy of sodium dodecyl sulfate at the water/vapor interface: approaches from molecular dynamics simulations. Langmuir 30(35): 10600-7

Adsorption of surfactants at the water/vapor interface depends upon their chemical potential at the interface, which is generally temperature-dependent. Molecular dynamics simulations have been performed to reveal temperature influences on the microstructure of sodium dodecyl sulfate (SDS) molecule adsorption layer. At room temperature, SDS molecules aggregate at the interface, being in a liquid-expanded phase, whereas they tend to spread out and probably transit to a gaseous phase as the temperature increases to above 318 K. This phase transition has been confirmed by the temperature-dependent changes in two-dimensional array, tilt angles, and immersion depths to the aqueous phase of SDS molecules. The aggregation of SDS molecules accompanies with larger immersion depths, more coordination of Na(+) ions, and less coordination of water. Desorption free energy profiles show that higher desorption free energy appears for SDS molecules at the aggregate state at low temperatures, but no energy barrier is observed. The shapes of desorption free energy profiles depend upon the distribution of SDS at the interface, which, in turn, is related to the phase state of SDS. Our study sheds light on the development of adsorption thermodynamics and kinetics theories.

US$19.90

PMID: 25127193

DOI: 10.1021/la502754x


Other references

Jańczuk, Z., 1974: Scientific achievements during the 25 years of the Pomeranian Medical Academy in the field of stomatology. Annales Academiae Medicae Stetinensis Suppl 12: 93-97

Nozaki S., 1988: Observations on health care trend made from the view point of public health. Nichidai Igaku Zasshi 47(1): 15-18

Despodova, T.; Pranchev, N.; Prigorov, S.; Mikhneva, O.; Damianov, L., 1989: Our experience in using nolitsin in puerperal infections (preliminary report). The therapeutic possibilities of the chemotherapeutic preparation Nolicine were studied. Clinical and laboratory parameters were followed in dynamics as well as microbiological examination of lochial and wounded secretion in dynamics. The results...

Kondo, O.; Ishida, H., 2003: Ontogenetic variation in the Dederiyeh neandertal infants: postcranial evidence. Cambridge Studies in Biological and Evolutionary Anthropology, 37: 386-411

Pedrosa, Mía.; Phillips-Angles, E.; López-Lera, A.; López-Trascasa, M.; Caballero, T., 2016: Complement Study Versus CINH Gene Testing for the Diagnosis of Type I Hereditary Angioedema in Children. Journal of Clinical Immunology 36(1): 16-18

Jain, N.; Hennessey, K., 2009: Hepatitis B vaccination coverage among U.S. adolescents, National Immunization Survey-Teen, 2006. To determine national estimates of hepatitis B vaccination among adolescents in the United States and factors associated with vaccination using provider-reported immunization histories. Data were analyzed from the 2006 National Immunization Survey...

Davies, H.V.; Chapman, J.M., 1979: Control of food mobilization in seeds of cucumis sativus 1. influence of embryonic axis and testa on protein and lipid degradation. The development of maximal rates of lipid and protein hydrolysis in cucumber cotyledons depends upon the removal of the testa and the presence of the embryonic axis. The testa appears to exert at least part of its inhibitory influence by suppressi...

Bow, E.J., 2005: Long-term antifungal prophylaxis in high-risk hematopoietic stem cell transplant recipients. The risks for invasive fungal infections, particularly mould infections such as invasive aspergillosis, among hematopoietic stem cell transplant (HSCT) recipients are linked to the duration and severity of myelosuppression and immunosuppression. S...

Springer, Ep, 1987: Assessing range management alternatives using simulation models. General technical report INT US Department of Agriculture Forest Service Intermountain Research Station: (215) 513-517

Sun Yong; Lin FangCan, 2003: Analysis of genetic diversity in natural germplasm of Lentinula edodes in China using RAPD technique. Fifty-three wild strains of L. edodes collected from 14 provinces of China and distributed in 8 floristic regions were assessed for DNA polymorphism using the random amplified polymorphic DNA (RAPD) technique. Some 147 RAPD bands were amplified us...