Ultrafast optical Kerr effect spectroscopy of water confined in nanopores of the gelatin gel

Ratajska-Gadomska, B.; Białkowski, Bartłomiej; Gadomski, W.; Radzewicz, Czesław

doi:10.1063/1.2730506

Cited by 10 publications

(8 citation statements)

References 53 publications

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“…where t -time delay, τ OKE -inertial rise time constant, usually assumed to be 200 fs [14,15], τ -fitted decay time. After removal of the first exponent, another one could be seen, which therefore was also fitted and removed in the same way.…”

Section: Experimental Datamentioning

confidence: 99%

Low frequency response of methanol/acetone mixtures: Optical Kerr effect and molecular dynamics simulations

Polok

Idrissi

Gadomski

2012

Journal of Molecular Liquids

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Section: Experimental Datamentioning

confidence: 99%

Low frequency response of methanol/acetone mixtures: Optical Kerr effect and molecular dynamics simulations

Polok

Idrissi

Gadomski

2012

Journal of Molecular Liquids

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“…The interaction at the solid/liquid interface changes the structure of liquids nearby the interfaces 107, 108. For example, water in hydrogels has been studied109–114 and found to exhibit three distinct structures: bound water, free water, and intermediate water 115–117. The bound water interacts strongly with the solid network and has aggregation structures that are different from the bulk water.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth of Calcium Carbonate in Hydrogels as a Model of Biomineralization

Asenath‐Smith

Keene

et al. 2012

Adv Funct Materials

202

307

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A gel is defi ned as a two-component (solid and liquid), continuous, solid-like material with viscoelastic rheological Crystal Growth of Calcium Carbonate in Hydrogels as a Model of BiomineralizationIn recent years, the prevalence of hydrogel-like organic matrices in biomineralization has gained attention as a route to synthesizing a diverse range of crystalline structures. Here, examples of hydrogels in biological, as well as synthetic, bio-inspired systems are discussed. Particular attention is given to understanding the physical versus chemical effects of a broad range of hydrogel matrices and their role in directing polymorph selectivity and morphological control in the calcium carbonate system. Finally, recent data regarding hydrogel-matrix incorporation into the growing crystals is discussed and a mechanism for the formation of these single-crystal composite materials is presented. Future and is researching crystal growth in gels as a means to form nanocomposites.chains form helices (double or single helices) that subsequently aggregate into three-dimensional (3D) bundles, forming a porous network with fi brous characteristics (Figure 1 a,b). [ 82 , 83 ] Both the gelling and melting temperatures can be tailored by chemical modifi cation such as partial hydroxyethylation. [ 84 ] The mechanical behavior of agarose gels is sensitive to molecular weight and concentration [ 85 ] as well as chemical modifi cation.

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“…uî is a unit vector along the molecular symmetry axis, the isotropic polarizability is given by 8) and the anisotropy is given by γ α α = − ⊥ (9) In a liquid confined in a cylindrical pore, the cylinder axis defines a unique direction. If this direction represents the z axis, then relaxation rates for the xz and yz polarizability components might be expected to differ from the relaxation rate of the xy component.…”

Section: Introductionmentioning

confidence: 99%

Polarizability Anisotropy Relaxation in Nanoconfinement: Molecular Simulation Study of Acetonitrile in Silica Pores

Milischuk

Ladanyi

2013

J. Phys. Chem. B

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We present the results of a molecular simulation study of polarizability anisotropy relaxation of liquid acetonitrile confined in approximately cylindrical silica pores of diameters in the range of 20-40 Å. Grand Canonical Monte Carlo simulation is used to determine the density of acetonitrile in pores in equilibrium with the bulk liquid, and canonical-ensemble molecular dynamics is then used to calculate the trajectories of the filled pores prepared in this way. We find that the pores are wetting, partially due to hydrogen bonding between acetonitrile nitrogen and pore silanol groups and that acetonitrile molecules have preferential orientations relative to the interface. The mobility of molecules in interfacial regions is considerably reduced and dependent mainly on their proximity to the interface. We include the contributions of molecular and interaction-induced polarizabilities to the collective polarizability anisotropy relaxation. We find that this relaxation includes a slowly relaxing component absent from the corresponding process in bulk acetonitrile and that the amplitude of this component increases as the pore diameter decreases. These results are in agreement with optical Kerr effect experiments on acetonitrile in silica pores in a similar diameter range. Further analysis of our data indicates that collective reorientation and predominantly translational "collision-induced" polarizability dynamics both contribute to the slowly relaxing portion of polarizability anisotropy decay. We further find that pore anisotropy plays a role, giving rise to different relaxation rates of polarizability anisotropy components with a different mix of axial and radial character and that collective reorientation contributing to polarizability anisotropy relaxation is somewhat faster at long times than single-molecule orientational relaxation.

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Ultrafast optical Kerr effect spectroscopy of water confined in nanopores of the gelatin gel

Cited by 10 publications

References 53 publications

Low frequency response of methanol/acetone mixtures: Optical Kerr effect and molecular dynamics simulations

Low frequency response of methanol/acetone mixtures: Optical Kerr effect and molecular dynamics simulations

Crystal Growth of Calcium Carbonate in Hydrogels as a Model of Biomineralization

Polarizability Anisotropy Relaxation in Nanoconfinement: Molecular Simulation Study of Acetonitrile in Silica Pores

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