Gelation Process of Toluene-Based bis-Urea in Cyclohexane Studied with Magnetic Resonance Imaging

• Authors: J. Tritt-Goc , J. Boguszyńska , M. Szwaj , L. Boutellier , J. Jadżyn
• Languages of publication: EN

Abstracts

EN

Magnetic resonance imaging was used for studies of the gelation and swelling processes of toluene-based bis-urea prepared in a form of cylindrical tablet and immersed in cyclohexane. The processes were investigated with the use of Bruker AVANCE (300 MHz) spectrometer equipped with a micro imaging probe head. The images were taken for cyclohexane protons within the bis-urea gel formed around the sample dry core at different intervals of the immersion. The mobility of the solvent molecules was estimated from the spatially resolved distribution of the spin-spin relaxation time T_2 and the spin densitiesρ, calculated on the basis of the images obtained. It was shown that the time-evolution of the thickness of the gel layer can be well described by the power equation with an exponent equal to 0.47 (±0.04), indicating the Fickian nature of the diffusion of cyclohexane molecules.

Keywords

EN

82.70.Gg; 76.60.Pc; 82.56.Lz; 82.56.Na

Discipline

• 82.56.Lz: Diffusion
• 82.70.Gg: Gels and sols
• 82.56.Na: Relaxation
• 76.60.Pc: NMR imaging(for medical NMR imaging, see 87.61.-c)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 1
• Pages: 81-87

Dates

published

2005-07

received

2005-04-24

Contributors

author

J. Tritt-Goc

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

J. Boguszyńska

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

M. Szwaj

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

L. Boutellier

• Laboratoire de Chimie des Polyméres, UMR 7610, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris CEDEX 05, France

author

J. Jadżyn

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.81