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Water dynamics near solutes and surf...

Moilanen, David Emil.

Water dynamics near solutes and surfaces.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Water dynamics near solutes and surfaces.
作者:	Moilanen, David Emil.
面頁冊數:	222 p.
附註:	Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: .
附註:	Adviser: Michael D. Fayer.
Contained By:	Dissertation Abstracts International70-10B.
標題:	Chemistry, Physical.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3382792
ISBN:	9781109447101

Water dynamics near solutes and surfaces.
Moilanen, David Emil.

Water dynamics near solutes and surfaces. - 222 p.

Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: .

Thesis (Ph.D.)--Stanford University, 2009.

The hydrogen bonding structure and dynamics of water are fundamentally important in a wide range of chemical, biological, geological, and industrial systems. Infrared spectroscopy of the OD stretch of dilute HOD in H2 O provides a sensitive probe of the hydrogen bonding network of water.

ISBN: 9781109447101Subjects--Topical Terms:

226924
Chemistry, Physical.

Water dynamics near solutes and surfaces.
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245 1 0 $a Water dynamics near solutes and surfaces.
300 $a 222 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-10, Section: B, page: .
500 $a Adviser: Michael D. Fayer.
502 $a Thesis (Ph.D.)--Stanford University, 2009.
520 $a The hydrogen bonding structure and dynamics of water are fundamentally important in a wide range of chemical, biological, geological, and industrial systems. Infrared spectroscopy of the OD stretch of dilute HOD in H2 O provides a sensitive probe of the hydrogen bonding network of water.
520 $a Water forms a nominally tetrahedral hydrogen bonding network as a liquid but rapid hydrogen bond switching events lead to fast water reorientation. A mechanism for water reorientation that involves large amplitude angular jumps has recently been proposed to describe the long time orientational dynamics. At short times, water molecules quickly sample a restricted range of angular space within an intact hydrogen bonding configuration. The amplitude of this inertial reorientation depends on the strength of the local hydrogen bonding network. When hydrogen bonds are stronger, the water is restricted to a smaller angular range about the hydrogen bond axis. Weaker hydrogen bonds allow larger angular excursions. A simple model for the angular hydrogen bond potential energy surface is presented based on the experimental data.
520 $a Water is rarely found as a pure liquid in real systems. Often it is in contact with a surface and its dynamics are modified near the surface. Reverse micelles formed using the surfactant Aerosol-OT (AOT), water, and isooctane, as well as AOT lamellar structures provide well-defined, tunable model systems to study the dynamics of water interacting with an interface. Reverse micelles are spherical water pools with radii that can be varied from less than one nanometer up to tens of nanometers. Lamellar structures are surfactant bilayers separated by thin sheets of water ranging in thickness from approximately one nanometer up to four nanometers. In large reverse micelles and lamellar structures, the confined water can be separated into two components, a core of bulk-like water and a shell of interfacial water. Polarization selective pump-probe spectroscopy of the OD stretch of dilute HOD in H2O confined in the reverse micelles provides a probe of the dynamics of the confined water. The characteristic vibrational lifetime and orientational correlation time of interfacial water are determined from a detailed investigation of the frequency dependence of the vibrational population relaxation and orientational anisotropy. The properties of interfacial water are independent of size and geometry for large reverse micelles and lamellar structures, indicating that it is the presence of an interface, not the geometry of the system or a specific confining length scale that affects the dynamics of interfacial water. As the reverse micelle size is decreased, the number of water molecules becomes small enough that the collective nature of water reorientation begins to cause the water away from the interface to be affected by the presence of the interface.
520 $a One of the most fundamental water-solute interactions is the transport of ions by water. This process is governed by the exchange of water molecules in the solvation shell of the ion. Solvation shell exchange is studied using pump-probe and 2D-IR Chemical Exchange Spectroscopy of a mixture of water and sodium tetrafluoroborate (NaBF4). The timescale for solvation shell exchange is extracted by simultaneously fitting the chemical exchange data, the vibrational population relaxation and the orientational anisotropy data to a kinetic model. Anion solvation shell exchange occurs on a timescale of approximately seven picoseconds, allowing rapid ion transport in solution.
590 $a School code: 0212.
650 4 $a Chemistry, Physical. $3 226924
650 4 $a Physics, Molecular. $3 227726
650 4 $a Physics, Optics. $3 226935
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690 $a 0609
690 $a 0752
710 2 $a Stanford University. $3 212607
773 0 $t Dissertation Abstracts International $g 70-10B.
790 1 0 $a Fayer, Michael D., $e advisor
790 $a 0212
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3382792