Relaxation and transport phenomena in corn seeds

Laudat, J; Pissis, P; Konsta, AA

dc.contributor.author	Laudat, J	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Konsta, AA	en
dc.date.accessioned	2014-03-01T02:48:34Z
dc.date.available	2014-03-01T02:48:34Z
dc.date.issued	1997	en
dc.identifier.issn	0277786X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/33906
dc.subject	Corn seeds	en
dc.subject	d.c. and a.c. conductivity	en
dc.subject	Glass transition	en
dc.subject	Hydration	en
dc.subject	Thermally stimulated depolarization	en
dc.subject.other	Depolarization	en
dc.subject.other	Dielectric materials	en
dc.subject.other	Dielectric spectroscopy	en
dc.subject.other	Glass	en
dc.subject.other	Hydration	en
dc.subject.other	Hydrogen	en
dc.subject.other	Molecules	en
dc.subject.other	Percolation (fluids)	en
dc.subject.other	Plants (botany)	en
dc.subject.other	Polarization	en
dc.subject.other	Seed	en
dc.subject.other	Spectrometry	en
dc.subject.other	Water content	en
dc.subject.other	Biological behaviors	en
dc.subject.other	Biological implications	en
dc.subject.other	Cereal seeds	en
dc.subject.other	Charge mobilities	en
dc.subject.other	Corn seeds	en
dc.subject.other	d.c. and a.c. conductivity	en
dc.subject.other	D.c. conductivities	en
dc.subject.other	Dry materials	en
dc.subject.other	Frequency dynamics	en
dc.subject.other	Glass transition temperatures	en
dc.subject.other	Molecular mobilities	en
dc.subject.other	Percolation thresholds	en
dc.subject.other	Plasticizing effects	en
dc.subject.other	Protonic conductivities	en
dc.subject.other	Room temperatures	en
dc.subject.other	Temperature ranges	en
dc.subject.other	Thermally stimulated depolarization	en
dc.subject.other	Thermally stimulated depolarization currents	en
dc.subject.other	Transport phenomenons	en
dc.subject.other	Water molecules	en
dc.subject.other	Glass transition	en
dc.title	Relaxation and transport phenomena in corn seeds	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1117/12.276258	en
heal.identifier.secondary	http://dx.doi.org/10.1117/12.276258	en
heal.publicationDate	1997	en
heal.abstract	The low-frequency dynamics in cereal seeds (wheat and triticale) has been studied by measurements of d.c. conductivity, thermally stimulated depolarization current techniques (TSDC, 80 - 300 K) and by broadband a.c. dielectric spectroscopy (10 Hz - 1 GHz) with the aim to understand its relation to their biological behavior. Such a broad overall frequency and temperature range allows to investigate simultaneously the mobility of water molecules in seeds, influence of water on molecular mobility of seeds constituents (plasticizing effect, TSDC and a.c. data) and charge mobility. Our results indicate, that water in seeds freeze for concentration higher than critical hydration, whereas for lower hydration it undergoes a glass-like transition. Temperature of this transition strongly depends on water content in the sample and shifts by seeds drying from 180 K up to room temperature. D.c protonic conductivity increases sharply above glass transition temperature. Its dependence on water content indicates percolative transport of protons along threads of hydrogen-bonded water molecules with a percolation threshold in the range of 0.15 - 0.30 g water/g dry material. The biological implications of these findings will be discussed.	en
heal.journalName	Proceedings of SPIE - The International Society for Optical Engineering	en
dc.identifier.doi	10.1117/12.276258	en
dc.identifier.volume	3181	en
dc.identifier.spage	95	en
dc.identifier.epage	98	en