ACOSTA RODOLFO HECTOR
Congresos y reuniones científicas
Título:
Larmor frequency spin-lattice relaxation profiles in nematic nPCH: an anomalous behavior
Autor/es:
R. H. ACOSTA; D. J. PUSIOL
Lugar:
Lisboa, Portugal
Reunión:
Congreso; 30th ISMAR International conference on Magnetic Resonance & Related Phenomena; 2000
Resumen:
Experimental T1-profiles of n-cyano- phenylcyclohexane (3,4,7-
PCH) at 310C (Figure1) were recorded by means of a
conventional (5*106<nL<108Hz) and fast field cycling
(103<nL<106 Hz) NMR spectrometers. With both instruments
the random error of the individual T1 points is less than 10%
after appropriate signal averaging, and the sample temperature
has been controlled with an accuracy of at least 0.2oC. The
FFC experimental set-up is home made [7], the design is
based on a electronically switched FFC-NMR spectrometer
which uses a special air core magnet design and a MOSFETs
magnet control and power switching [8]. Additional coils are
used for shimming the detection magnetic field. The earth?s
field is compensated
PCH) at 310C (Figure1) were recorded by means of a
conventional (5*106<nL<108Hz) and fast field cycling
(103<nL<106 Hz) NMR spectrometers. With both instruments
the random error of the individual T1 points is less than 10%
after appropriate signal averaging, and the sample temperature
has been controlled with an accuracy of at least 0.2oC. The
FFC experimental set-up is home made [7], the design is
based on a electronically switched FFC-NMR spectrometer
which uses a special air core magnet design and a MOSFETs
magnet control and power switching [8]. Additional coils are
used for shimming the detection magnetic field. The earth?s
field is compensated
