Matches in SemOpenAlex for { <https://semopenalex.org/work/W2951073630> ?p ?o ?g. }
Showing items 1 to 79 of
79
with 100 items per page.
- W2951073630 abstract "The question of relaxation time distributions in viscous liquids is examined by observing time‐dependent behavior of optically active elements of the liquid structure, both intrinsic and otherwise, in response to perturbations from equilibrium states. As a suitable medium for this study the polyalcohol sorbitol C6H8(OH)6 is adopted. Equilibrium distributions of intact and broken hydrogen bonds in the pure sorbitol have been determined using near IR spectra, and the loss of, and re‐establishment of, this equilibrium, during down and up temperature ramping processes, has been monitored and analyzed. The hydrogen‐bond equilibrium is established on essentially the same time scale and with essentially the same distribution of relaxation times as for the enthalpy. (The latter has been monitored by differential scanning calorimetry). Analysis shows that the kinetics of the bond‐breaking process are well accounted for by a relaxation function, near equilibrium, of the form φe(t) =e−[(t/τ0)β], with β=0.55±0.03. As extrinsic probes, two carbocyanine dyestuffs have been introduced in low concentrations into the sorbitol, and the equilibrium distribution of monomer and dimer species has been determined as a function of temperature. The loss and recovery of the equilibrium has also been monitored during down and up temperature ramping experiments. It is found that these equilibria are lost and recovered at temperatures far above that at which solvent structure equilibrium is established on the same time scale, showing that equilibration times for the monomer–dimer equilibrium are many orders of magnitude longer than for solvent structure. In this case the probe equilibrium is established with a single relaxation time, which depends on concentration, but which is not consistent with second order reaction kinetics. Finally, the distribution of Co2+ ion probes between octahedral Co(−OH)62+ and CoCl42− sites in sorbitol + pyridinium chloride solutions has been studied at equilibrium and then monitored during temperature ramping processes. In this case the probe ion octahedral–tetrahedral equilibrium is established on the same overall time scale as the enthalpy and the hydrogen bond equilibrium, but the ’’spectrum of times’’ is distinctly narrower, i.e., the β parameter in the relaxation function is much closer to unity. This is consistent with previous observations for local structure processes in a purely ionic solvent. All observations are consistent with the idea that the spectrum of relaxation times which is observed for a given relaxation process depends on the volume of the system subspace which must be explored to relax most of the imposed stress." @default.
- W2951073630 created "2019-06-27" @default.
- W2951073630 creator A5004167419 @default.
- W2951073630 creator A5034743712 @default.
- W2951073630 date "1979-05-08" @default.
- W2951073630 modified "2023-09-27" @default.
- W2951073630 title "ChemInform Abstract: OPTICAL PROBE STUDIES OF RELAXATION PROCESSES IN VISCOUS LIQUIDS" @default.
- W2951073630 cites W2041143637 @default.
- W2951073630 doi "https://doi.org/10.1002/chin.197919086" @default.
- W2951073630 hasPublicationYear "1979" @default.
- W2951073630 type Work @default.
- W2951073630 sameAs 2951073630 @default.
- W2951073630 citedByCount "0" @default.
- W2951073630 crossrefType "journal-article" @default.
- W2951073630 hasAuthorship W2951073630A5004167419 @default.
- W2951073630 hasAuthorship W2951073630A5034743712 @default.
- W2951073630 hasConcept C10710636 @default.
- W2951073630 hasConcept C112887158 @default.
- W2951073630 hasConcept C112964491 @default.
- W2951073630 hasConcept C121332964 @default.
- W2951073630 hasConcept C147789679 @default.
- W2951073630 hasConcept C15744967 @default.
- W2951073630 hasConcept C166940927 @default.
- W2951073630 hasConcept C178790620 @default.
- W2951073630 hasConcept C185592680 @default.
- W2951073630 hasConcept C2776029896 @default.
- W2951073630 hasConcept C2779546866 @default.
- W2951073630 hasConcept C2780471494 @default.
- W2951073630 hasConcept C3288061 @default.
- W2951073630 hasConcept C32909587 @default.
- W2951073630 hasConcept C521977710 @default.
- W2951073630 hasConcept C77805123 @default.
- W2951073630 hasConcept C97355855 @default.
- W2951073630 hasConceptScore W2951073630C10710636 @default.
- W2951073630 hasConceptScore W2951073630C112887158 @default.
- W2951073630 hasConceptScore W2951073630C112964491 @default.
- W2951073630 hasConceptScore W2951073630C121332964 @default.
- W2951073630 hasConceptScore W2951073630C147789679 @default.
- W2951073630 hasConceptScore W2951073630C15744967 @default.
- W2951073630 hasConceptScore W2951073630C166940927 @default.
- W2951073630 hasConceptScore W2951073630C178790620 @default.
- W2951073630 hasConceptScore W2951073630C185592680 @default.
- W2951073630 hasConceptScore W2951073630C2776029896 @default.
- W2951073630 hasConceptScore W2951073630C2779546866 @default.
- W2951073630 hasConceptScore W2951073630C2780471494 @default.
- W2951073630 hasConceptScore W2951073630C3288061 @default.
- W2951073630 hasConceptScore W2951073630C32909587 @default.
- W2951073630 hasConceptScore W2951073630C521977710 @default.
- W2951073630 hasConceptScore W2951073630C77805123 @default.
- W2951073630 hasConceptScore W2951073630C97355855 @default.
- W2951073630 hasIssue "19" @default.
- W2951073630 hasLocation W29510736301 @default.
- W2951073630 hasOpenAccess W2951073630 @default.
- W2951073630 hasPrimaryLocation W29510736301 @default.
- W2951073630 hasRelatedWork W1996305581 @default.
- W2951073630 hasRelatedWork W1997311686 @default.
- W2951073630 hasRelatedWork W1999038835 @default.
- W2951073630 hasRelatedWork W2001952078 @default.
- W2951073630 hasRelatedWork W2020879056 @default.
- W2951073630 hasRelatedWork W2029099967 @default.
- W2951073630 hasRelatedWork W2038513243 @default.
- W2951073630 hasRelatedWork W2041143637 @default.
- W2951073630 hasRelatedWork W2049717162 @default.
- W2951073630 hasRelatedWork W2075671504 @default.
- W2951073630 hasRelatedWork W2084762960 @default.
- W2951073630 hasRelatedWork W2085036048 @default.
- W2951073630 hasRelatedWork W2096438143 @default.
- W2951073630 hasRelatedWork W2133823615 @default.
- W2951073630 hasRelatedWork W2138754186 @default.
- W2951073630 hasRelatedWork W2150877322 @default.
- W2951073630 hasRelatedWork W2168887915 @default.
- W2951073630 hasRelatedWork W2779357528 @default.
- W2951073630 hasRelatedWork W3023679991 @default.
- W2951073630 hasRelatedWork W3205824981 @default.
- W2951073630 hasVolume "10" @default.
- W2951073630 isParatext "false" @default.
- W2951073630 isRetracted "false" @default.
- W2951073630 magId "2951073630" @default.
- W2951073630 workType "article" @default.