title: Universal correlation between solvent polarity, fluorescence lifetime and macroscopic viscosity of alcohol solutions.
abstract: In this report, we show interesting correlation between solvent polarity of alcohol solutions and fluorescence lifetime (τ(av)), estimated from time-resolved fluorescence spectroscopy (TRFS), and macroscopic viscosity (η). Non-functionalized carbon nanoparticles (NCNP) were successfully used as flurophores in these measurements. The solvent polarity, described through polarizability (Δf) of dielectric continuum theory, could universally describe both τ(av)/τ(max) and η/η(max) through the relation, [Formula: see text] with X = τ(av)/τ(max) or η/η(max), (subscript OH represents corresponding values for alcohols) for alcohol solutions of methanol, ethanol and 1-propanol at room temperature. We show that fluorescence lifetime and solvent viscosity are universal functions of solvent polarity for alcohol solutions.
authors.affiliation: Nanomaterials and Nanocomposites Laboratory, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India.
authors.forename: Pradip
authors.initials: P
authors.lastname: Kumar
authors.forename: H B
authors.initials: HB
authors.lastname: Bohidar
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D005453:Fluorescence; D053758:Nanoparticles / Q000737:chemistry; D012996:Solutions; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014783:Viscosity
chemical_list: D000438:Alcohols; D012996:Solutions; D012997:Solvents; D002244:Carbon