Nuclear magnetic relaxation dispersion measurement of water mobility at a silica surface

Carl F. Polnaszek; Douglas A. Hanggi; Peter W. Carr; Robert G. Bryant

doi:10.1016/S0003-2670(00)84786-8

Nuclear magnetic relaxation dispersion measurement of water mobility at a silica surface

Carl F. Polnaszek, Douglas A. Hanggi, Peter W. Carr, Robert G. Bryant

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Nuclear magnetic relaxation rates are measured as a function of magnetic field strength corresponding to proton Larmor frequencies ranging from 0.01 to 42 MHz for silica gel samples with a nitroxide free radical covalently attached at the surface. The field dependence of the relaxation rate is interpreted using a translational model for the relaxation equation to yield a translational diffusion coefficient for the water, in the immediate vicinity of the radical attached to the surface, of 2.1 × 10^-6 cm² s^-1 at 278 K for Si-4000 silica.

Original language	English (US)
Pages (from-to)	311-315
Number of pages	5
Journal	Analytica Chimica Acta
Volume	194
Issue number	C
DOIs	https://doi.org/10.1016/S0003-2670(00)84786-8
State	Published - 1987

Bibliographical note

Funding Information:
This work was supported in part by the National Institutes of Health and the National Science Foundation.

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10.1016/S0003-2670(00)84786-8

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title = "Nuclear magnetic relaxation dispersion measurement of water mobility at a silica surface",

abstract = "Nuclear magnetic relaxation rates are measured as a function of magnetic field strength corresponding to proton Larmor frequencies ranging from 0.01 to 42 MHz for silica gel samples with a nitroxide free radical covalently attached at the surface. The field dependence of the relaxation rate is interpreted using a translational model for the relaxation equation to yield a translational diffusion coefficient for the water, in the immediate vicinity of the radical attached to the surface, of 2.1 × 10-6 cm2 s-1 at 278 K for Si-4000 silica.",

author = "Polnaszek, {Carl F.} and Hanggi, {Douglas A.} and Carr, {Peter W.} and Bryant, {Robert G.}",

note = "Funding Information: This work was supported in part by the National Institutes of Health and the National Science Foundation.",

year = "1987",

doi = "10.1016/S0003-2670(00)84786-8",

language = "English (US)",

volume = "194",

pages = "311--315",

journal = "Analytica Chimica Acta",

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T1 - Nuclear magnetic relaxation dispersion measurement of water mobility at a silica surface

AU - Polnaszek, Carl F.

AU - Hanggi, Douglas A.

AU - Carr, Peter W.

AU - Bryant, Robert G.

N1 - Funding Information: This work was supported in part by the National Institutes of Health and the National Science Foundation.

PY - 1987

Y1 - 1987

N2 - Nuclear magnetic relaxation rates are measured as a function of magnetic field strength corresponding to proton Larmor frequencies ranging from 0.01 to 42 MHz for silica gel samples with a nitroxide free radical covalently attached at the surface. The field dependence of the relaxation rate is interpreted using a translational model for the relaxation equation to yield a translational diffusion coefficient for the water, in the immediate vicinity of the radical attached to the surface, of 2.1 × 10-6 cm2 s-1 at 278 K for Si-4000 silica.

AB - Nuclear magnetic relaxation rates are measured as a function of magnetic field strength corresponding to proton Larmor frequencies ranging from 0.01 to 42 MHz for silica gel samples with a nitroxide free radical covalently attached at the surface. The field dependence of the relaxation rate is interpreted using a translational model for the relaxation equation to yield a translational diffusion coefficient for the water, in the immediate vicinity of the radical attached to the surface, of 2.1 × 10-6 cm2 s-1 at 278 K for Si-4000 silica.

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JO - Analytica Chimica Acta

JF - Analytica Chimica Acta

IS - C

ER -

Nuclear magnetic relaxation dispersion measurement of water mobility at a silica surface

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