Convection In Liquid-state Nmr: Expect The Unexpected

dc.creatorBarbosa
dc.creatorT. M.; Rittner
dc.creatorR.; Tormena
dc.creatorC. F.; Morris
dc.creatorG. A.; Nilsson
dc.creatorM.
dc.date2016
dc.date2017-11-13T13:44:19Z
dc.date2017-11-13T13:44:19Z
dc.date.accessioned2018-03-29T05:58:57Z
dc.date.available2018-03-29T05:58:57Z
dc.identifierRsc Advances. Royal Soc Chemistry, v. 6, p. 95173 - 95176, 2016.
dc.identifier2046-2069
dc.identifierWOS:000385632400104
dc.identifier10.1039/c6ra23427e
dc.identifierhttp://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra23427e#!divAbstract
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/328737
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1365762
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionTemperature gradients in liquid-state NMR samples are unavoidable, but undesirable: they lead to sample convection, and consequently to signal attenuation in experiments that use field gradients. This paper illustrates how widely the dependence of sample convection velocity on the temperature at which the sample is maintained can differ between different probes and different spectrometers, including the first such results for cryoprobe systems, and highlights the importance of understanding this dependence if the effects of sample convection are to be kept to an acceptable minimum. It is sometimes thought that efficient sample temperature control should suffice to avoid convection: alas, this is not true, and rapid sample convection can occur even with the best hardware. Previous experiments have shown that the effects of convection can sometimes be avoided by setting the sample temperature regulation to one particular temperature; here it is shown that no such temperature exists in some probes. The issue of convection is all too often swept under the carpet; these results confirm that it is a more general problem than is commonly realized.
dc.description6
dc.description97
dc.description95173
dc.description95176
dc.descriptionSao Paulo Research Foundation (FAPESP) [2015/08541-6, 2014/25903-6, 2014/12776-6, 2015/19229-3]
dc.descriptionCNPq
dc.descriptionCAPES [88881.030355/2013-01]
dc.descriptionEPSRC [EP/K039547]
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageEnglish
dc.publisherRoyal Soc Chemistry
dc.publisherCambridge
dc.relationRSC Advances
dc.rightsaberto
dc.sourceWOS
dc.subjectImproving Pulse Sequences
dc.subjectDiffusion Measurements
dc.subjectThermal-convection
dc.subjectSample Rotation
dc.subjectCompensation
dc.subjectSpectroscopy
dc.titleConvection In Liquid-state Nmr: Expect The Unexpected
dc.typeArtículos de revistas


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