Mössbauer studies of bound diffusion in a model polymer system

Plachinda, A. S.; Sedov, V. E.; Khromov, VI Vi; Suzdalev, I. P.; Goldanskii, V.; Nienhaus, G. Ulrich; Parak, F.

doi:10.1103/physrevb.45.7716

Cited by 26 publications

(12 citation statements)

References 36 publications

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“…Thus, recoil-free nuclear absorption of the gamma radiation (the Mössbauer effect) may appear even for an unbounded free particle. This differs from the results of previous studies of many other smaller objects [24,25]. The specimen studied here should be treated as a set of classical macroscopic absorbers.…”

Section: Resultscontrasting

confidence: 72%

Frictionless mobility of submicron particles in model viscid fluid

2019

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The mechanism of inter-and intracellular diffusional transport by vesicles in living organisms is poorly understood at the molecular scale. The diffusion of submicron and nanoparticles in dense media has been treated by numerous theoretical models. We face this problem experimentally using Mössbauer spectroscopy. On a characteristic for this method narrow time scale (≈10 −7 s), the velocity distribution of 120 nm spherical Fe 2 O 3 particles suspended in a 60% water solution of sucrose was determined by analyzing the 57 Fe Mössbauer spectral line profile. The particles usually exhibit classical Brownian motion, but their main diffusion mechanism is related to infrequent ( f≈10 6 s −1 ) but distant (d≈1 nm) translations. During such movements, the particles experience a minimal friction described by the temporal local viscosity, η loc ≈28 μPa·s.

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Section: Resultscontrasting

confidence: 72%

Frictionless mobility of submicron particles in model viscid fluid

2019

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“…3. Thus, the modified clusters in our case are most likely thick greases rather than colloids, as represented, e.g., by ferric oxide clusters in pores [21], the Mossbauer spectra of which exhibit a superposition of wide and narrow components in contrast to our findings. The mechanism of the influence of the surfactant on 7-ferric oxide clusters will be discussed elsewhere.…”

Section: Cluster Structure and Cluster Size Determinationcontrasting

confidence: 72%

Study of intracluster atomic mobility in ultrafine clusters of γ-ferric oxide by Mossbauer spectroscopy and thermodynamical analysis

Suzdalev

Buravtsev

Imshennik

et al. 1996

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The atomic dynamics of ultrafine clusters of y-ferric oxide with diameters of 1-3 nm, obtained by thermal decomposition of ferric oxalate, has been studied by gamma-resonance (Mossbauer) spectroscopy and by thermodynamic analysis. The intracluster atomic mobility has been shown to increase by the action of surfactants. Thermodynamical and phenomenological cluster models describing the dynamic state of clusters have been developed and are compared with the experimental data. The conditions for formation of a specific solid-liquid state of clusters are discussed.

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“…When the M6ssbauer probe is used, its mobility is mainly determined by the microstructure rather than the mobility of the net of the solvated ion exchanger. 5,6 Therefore, an alternative approach is very important: the study of the dynamics of a polymer--water (solvate) system by the Rayleigh scattering of M~ssbauer radiation (RSMR). The possibility to study any substance in the absence of M6ssbauer atoms is a great advantage of the method, although there is some uncertainty in separating the contributions of components of the two(multi)-component system to the integral spectrum of the scattered radiation.…”

Section: Changersmentioning

confidence: 99%

Effect of hydration on the dynamics of polymeric cation exchangers and polymeric sorbent inferred from the Rayleigh scattering of Mössbauer radiation

et al. 1998

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Dependences of the dynamics of hydrophilic polymeric nets of acrylate cation exchanger, sulfonated poly(styrenedivinylbenzene) cation exchanger, and hydrophobic poly(divinylbenzeneethylstyrene) sorbent on the degree of hydration were studied by the Rayleigh scattering of MOssbauer radiation (RSMR). Dependences of the integral elastic fraction of RSMR of the polymer--water systems on the water/polymer mass ratio were determined. In the case of the cation exchangers, a considerable decrease in the elastic fraction of RSMR of the polymer during hydration was established. A considerable increase in the mobility of the nets indicates their transition from a glassy state to an elastic state. It was established that the intramolecular mobility of the hydrophobic polymeric sorbent remains unchanged during its hydration, and it contains water clusters with the nonzero elastic fraction of RSMR in its finest pores.Key words: Rayleigh scattering of M6ssbauer radiation, dynamics of polymers, polymeric ion exchangers, polymeric sorbents, hydration.The study of the dynamics of polymers is motivated by the relation between their dynamics and important functional properties. This concerns completely a special class of reactive polymers, viz., polymeric ion exchangers.Previously, 1-4 it has been established by M6ssbauer spectroscopy that the hydration of the three-dimensional polymeric net of an acrylate cation exchanger results in its transition from the glassy to the elastic state with very intense intramolecular motions. The frequency and amplitude parameters of these motions were studied quantitatively, and their strong dependence on the crosslinkage concentration of the polymeric net was established. In these works, the MOssbauer isotope 57Fe was introduced into the ion exchanger to form a strong complex with functional groups (--RCOO-)2Fe3+A -. In this case, the dynamics of the Fe atom reflected the dynamics of the fragment of the polymeric net. The necessary presence of functional groups, which bind strongly the atom-label, is the natural restriction of this approach. In addition, the effect of a metal ion on the dynamics of the polymeric net and the dynamic heterogeneity of the net cannot be ambiguously separated in the strong dependence of the mobility on the number of metal ions introduced. When the M6ssbauer probe is used, its mobility is mainly determined by the microstructure rather than the mobility of the net of the solvated ion exchanger. 5,6 Therefore, an alternative approach is very important: the study of the dynamics of a polymer--water (solvate) system by the Rayleigh scattering of M~ssbauer radiation (RSMR). The possibility to study any substance in the absence of M6ssbauer atoms is a great advantage of the method, although there is some uncertainty in separating the contributions of components of the two(multi)-component system to the integral spectrum of the scattered radiation.In this work, we present the first results of the study of the dynamics of the polymeric ion exchanger--water and polymeric sorbent...

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Mössbauer studies of bound diffusion in a model polymer system

Cited by 26 publications

References 36 publications

Frictionless mobility of submicron particles in model viscid fluid

Frictionless mobility of submicron particles in model viscid fluid

Study of intracluster atomic mobility in ultrafine clusters of γ-ferric oxide by Mossbauer spectroscopy and thermodynamical analysis

Effect of hydration on the dynamics of polymeric cation exchangers and polymeric sorbent inferred from the Rayleigh scattering of Mössbauer radiation

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