Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
NEW PERSPECTIVES OF NMR IN ULTRAHIGH STATIC MAGNETIC-FIELD GRADIENTS
Autore:
CHANG IY; FUJARA F; GEIL B; HINZE G; SILLESCU H; TOLLE A;
Indirizzi:
UNIV DORTMUND,FACHBEREICH PHYS,POSTFACH 500500 D-44221 DORTMUND GERMANY UNIV DORTMUND,FACHBEREICH PHYS D-44221 DORTMUND GERMANY UNIV MAINZ,INST PHYS CHEM D-55099 MAINZ GERMANY
Titolo Testata:
Journal of non-crystalline solids
, volume: 172, anno: 1994,
parte:, 2
pagine: 674 - 681
SICI:
0022-3093(1994)172:<674:NPONIU>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMER MELTS; DIFFUSION; TRANSITION; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
I.Y. Chang et al., "NEW PERSPECTIVES OF NMR IN ULTRAHIGH STATIC MAGNETIC-FIELD GRADIENTS", Journal of non-crystalline solids, 172, 1994, pp. 674-681

Abstract

The magnetic field gradient nuclear magnetic resonance (NMR) stimulated echo experiment measures the incoherent (or self) part of the intermediate scattering function S(Q, t) similar to [exp[ -iQr(0)] exp [iQr(t)]] with a 'generalized' scattering vector Q = gamma.g.tau (gamma isthe gyromagnetic ratio, g is the magnetic field gradient, tau is the evolution time). With ultrahigh static field gradients up to approximate to 180 T/m, a prototype of which has recently been installed in Mainz, Q-values up to > 10(-2) Angstrom(-1) become accessible. The first part of the paper focusses on details of this technical development and points out the close analogy with incoherent neutron scattering. In the second part, the enormous new possibilities of this kind of gradient NMR are demonstrated through a collection of most recent applications: the measurement of small self-diffusion coefficients down to about10(-15) m(2) s(-1) in supercooled liquids and in molecular crystals, long chain polymer dynamics, restricted diffusion in systems of confined mesoscopic geometries and anomalous diffusion on fractal structures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 09:59:30