Water dynamics at neutral and ionic interfaces.
The orientational dynamics of water at a neutral surfactant reverse micelle interface are measured with ultrafast infrared spectroscopy of the hydroxyl stretch, and the results are compared to orientational relaxation of water interacting with an ionic interface. The comparison provides insights into the influence of a neutral vs. ionic interface on hydrogen bond dynamics. Measurements are made and analyzed for large nonionic surfactant Igepal CO-520reverse micelles (water nanopool with a 9-nm diameter). The results are compared with those from a previous study of reverse micelles of the same size formed with the ionic surfactant Aerosol-OT (AOT). The results demonstrate that the orientational relaxation times for interfacial water molecules in the two types of reverse micelles are very similar (13 ps for Igepal and 18 ps for AOT) and are significantly slower than that of bulk water (2.6 ps). The comparison of water orientational relaxation at neutral and ionic interfaces shows that the presence of an interface plays the dominant role in determining the hydrogen bond dynamics, whereas the chemical nature of the interface plays a secondary role.
Fenn
Emily E
EE
Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
Wong
Daryl B
DB
Fayer
M D
MD
D006860:Hydrogen Bonding; D006878:Hydroxides / Q000737:chemistry; D008823:Micelles; D013055:Spectrophotometry, Infrared; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D006878:Hydroxides; D008823:Micelles; D013501:Surface-Active Agents; D014867:Water; C031356:hydroxide ion
Proc Natl Acad Sci U S A. 2008 Apr 8;105(14):5295-300
18381817
J Chem Phys. 2004 Dec 22;121(24):12431-46
15606264
J Phys Chem A. 2005 Jul 21;109(28):6154-65
16833955
J Am Chem Soc. 2008 Oct 22;130(42):13927-37
18823116
Phys Rev Lett. 2005 May 6;94(17):178301
15904342
J Am Chem Soc. 2006 Aug 16;128(32):10366-7
16895392
Science. 2006 Feb 10;311(5762):832-5
16439623
J Phys Chem C Nanomater Interfaces. 2007;111(25):8884-8891
18728757
J Am Chem Soc. 2009 Apr 22;131(15):5530-9
19323522
J Phys Chem B. 2007 Dec 27;111(51):14193-207
18047308
J Am Chem Soc. 2007 Nov 14;129(45):13847-56
17958418
J Chem Phys. 2005 Feb 1;122(5):54506
15740338
Chem Rev. 2005 Sep;105(9):3197-219
16159150
Proc Natl Acad Sci U S A. 2007 Oct 23;104(43):16731-8
17940023
J Chem Phys. 2009 Jul 7;131(1):014704
19586114
Phys Rev Lett. 2007 Oct 5;99(14):148301
17930728
J Am Chem Soc. 2009 Jun 17;131(23):8318-28
19449867
J Phys Chem B. 2008 Jul 31;112(30):9112-7
18610957
J Phys Chem B. 2009 Feb 26;113(8):2428-35
19193030
Proc Natl Acad Sci U S A. 2006 Oct 17;103(42):15355-8
17028175
J Phys Chem A. 2006 Apr 20;110(15):4985-99
16610816
J Chem Phys. 2004 May 1;120(17):8107-17
15267730
J Chem Phys. 2006 Sep 7;125(9):094713
16965111
J Phys Chem A. 2006 Jul 27;110(29):9084-8
16854019
J Phys Chem B. 2008 Nov 13;112(45):14230-42
18942871
Proc Natl Acad Sci U S A. 2009 Jan 13;106(2):375-80
19106293
J Phys Chem B. 2009 Jun 25;113(25):8560-8
19485407
J Am Chem Soc. 2007 Nov 21;129(46):14311-8
17958424
Proc Natl Acad Sci U S A. 2003 Oct 14;100(21):12135-40
14528004
J Phys Chem B. 2008 May 1;112(17):5279-90
18370431