Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass

C. Choi, J. Bharatam, M. Geilikman, M. B. Dusseault, M. M. Pintar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A water proton spin-lattice relaxation study of the spin-label molecules 2,2,6,6-tetramethyl-4-acetamido-piperidine-1-oxyl (TMAPO) solution in glass pores of 127 nm diam reveals that when the porous glass is hydrated with a 1 mM TMAPO solution, the TMAPO concentration in pore water is maintained constant during dehydration. However, it was observed that if the pore diameter is 49.1 nm or smaller, the Langmuir isotherm is not applicable, although the surface-to-volume ratio is larger. The observed proton relaxation's dependence on pore volume-to-water volume ratio V0/V, is in excellent accord with the results of the electron paramagnetic resonance experiments and supports a model based on the fast exchange of water between nonequivalent environments.

Original languageEnglish (US)
Pages (from-to)4461-4464
Number of pages4
JournalJournal of Applied Physics
Volume82
Issue number9
StatePublished - Nov 1 1997

Fingerprint

piperidine
porosity
protons
glass
water
molecules
dehydration
spin-lattice relaxation
electron paramagnetic resonance
isotherms

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Choi, C., Bharatam, J., Geilikman, M., Dusseault, M. B., & Pintar, M. M. (1997). Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass. Journal of Applied Physics, 82(9), 4461-4464.

Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass. / Choi, C.; Bharatam, J.; Geilikman, M.; Dusseault, M. B.; Pintar, M. M.

In: Journal of Applied Physics, Vol. 82, No. 9, 01.11.1997, p. 4461-4464.

Research output: Contribution to journalArticle

Choi, C, Bharatam, J, Geilikman, M, Dusseault, MB & Pintar, MM 1997, 'Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass', Journal of Applied Physics, vol. 82, no. 9, pp. 4461-4464.
Choi C, Bharatam J, Geilikman M, Dusseault MB, Pintar MM. Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass. Journal of Applied Physics. 1997 Nov 1;82(9):4461-4464.
Choi, C. ; Bharatam, J. ; Geilikman, M. ; Dusseault, M. B. ; Pintar, M. M. / Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass. In: Journal of Applied Physics. 1997 ; Vol. 82, No. 9. pp. 4461-4464.
@article{1f8b491528ac475da0231768693eecba,
title = "Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass",
abstract = "A water proton spin-lattice relaxation study of the spin-label molecules 2,2,6,6-tetramethyl-4-acetamido-piperidine-1-oxyl (TMAPO) solution in glass pores of 127 nm diam reveals that when the porous glass is hydrated with a 1 mM TMAPO solution, the TMAPO concentration in pore water is maintained constant during dehydration. However, it was observed that if the pore diameter is 49.1 nm or smaller, the Langmuir isotherm is not applicable, although the surface-to-volume ratio is larger. The observed proton relaxation's dependence on pore volume-to-water volume ratio V0/V, is in excellent accord with the results of the electron paramagnetic resonance experiments and supports a model based on the fast exchange of water between nonequivalent environments.",
author = "C. Choi and J. Bharatam and M. Geilikman and Dusseault, {M. B.} and Pintar, {M. M.}",
year = "1997",
month = "11",
day = "1",
language = "English (US)",
volume = "82",
pages = "4461--4464",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "9",

}

TY - JOUR

T1 - Relaxation of water proton spins by paramagnetic spin-label molecules in porous glass

AU - Choi, C.

AU - Bharatam, J.

AU - Geilikman, M.

AU - Dusseault, M. B.

AU - Pintar, M. M.

PY - 1997/11/1

Y1 - 1997/11/1

N2 - A water proton spin-lattice relaxation study of the spin-label molecules 2,2,6,6-tetramethyl-4-acetamido-piperidine-1-oxyl (TMAPO) solution in glass pores of 127 nm diam reveals that when the porous glass is hydrated with a 1 mM TMAPO solution, the TMAPO concentration in pore water is maintained constant during dehydration. However, it was observed that if the pore diameter is 49.1 nm or smaller, the Langmuir isotherm is not applicable, although the surface-to-volume ratio is larger. The observed proton relaxation's dependence on pore volume-to-water volume ratio V0/V, is in excellent accord with the results of the electron paramagnetic resonance experiments and supports a model based on the fast exchange of water between nonequivalent environments.

AB - A water proton spin-lattice relaxation study of the spin-label molecules 2,2,6,6-tetramethyl-4-acetamido-piperidine-1-oxyl (TMAPO) solution in glass pores of 127 nm diam reveals that when the porous glass is hydrated with a 1 mM TMAPO solution, the TMAPO concentration in pore water is maintained constant during dehydration. However, it was observed that if the pore diameter is 49.1 nm or smaller, the Langmuir isotherm is not applicable, although the surface-to-volume ratio is larger. The observed proton relaxation's dependence on pore volume-to-water volume ratio V0/V, is in excellent accord with the results of the electron paramagnetic resonance experiments and supports a model based on the fast exchange of water between nonequivalent environments.

UR - http://www.scopus.com/inward/record.url?scp=4143099293&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4143099293&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:4143099293

VL - 82

SP - 4461

EP - 4464

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 9

ER -