The structural parameters of rigid matrix of saccharide-based gel described by short and long diffusion regime analysis

Kowalczuk, Joanna

doi:10.1007/s10853-017-1261-9

Cited by 3 publications

(2 citation statements)

References 39 publications

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“…The CHESS-STE sequence described here produces a diffusion coefficient for spins virtually free of magnetization exchange effects, as long as the sites participating in magnetization exchange are resolved in the 1 H chemical shift dimension. This technique is expected to be beneficial in: (i) determining diffusion coefficient of water in agarose/water system or more generally water adsorbed to polymers, [57][58][59] (ii) probing the microscopic structure of materials via water restricted diffusion measured by PGSE NMR, specifically where potential presence of exchange/cross-relaxation is of concern, and (iii) extracting exchange kinetic parameters by PGSE NMR via multiple-parameter nonlinear regression. 48…”

Section: Discussionmentioning

confidence: 99%

Water diffusion in complex systems measured by PGSE NMR using chemical shift selective stimulated echo: Elimination of magnetization exchange effects

Meikle

Keizer

Separovic

et al. 2021

The Journal of Chemical Physics

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The interpretation of molecular translational diffusion as measured by pulsed gradient spinecho NMR (PGSE NMR) can be complicated by the presence of chemical exchange and/or dipolar cross-relaxation (including relayed cross-relaxation via spin diffusion). The magnitude of influence depends on the kinetics of exchange and/or dipolar cross-relaxation present within the system as well as the PGSE NMR sequences chosen for the measurements. Firstly, we present an exchange induced zero-crossing phenomenon for signal attenuation of water in lipidic cubic phases (LCPs, formed by a mixture of monoolein and water) in the presence of pulsed gradients observed using a standard STimulated Echo (STE) sequence. This magnetization exchange induced zero-crossing phenomenon, a pseudo negative diffractionlike feature, resembles that reported previously for restricted diffusion when locally anisotropic pores are polydisperse or randomly oriented. We then demonstrate the elimination of these exchange and/or dipolar cross-relaxation induced effects with the use of a chemical shift selective STE (CHESS-STE) sequence, adapted from the previously reported band-selective short transient STE (BEST-STE) sequence, along with results obtained from the bipolar pulse pair STE (BPP-STE) sequence for comparison. The CHESS-STE sequence introduced here represents a generic form of PGSE NMR sequences for obtaining water diffusion coefficients free from influence of exchange and/or dipolar cross-relaxation in complex systems. It has potential applications in measuring translational diffusion of water in biopolymer mixtures as well as probing microscopic structure in materials via water restricted diffusion measured by PGSE NMR, particularly when the potential presence of exchange/cross-relaxation is of concern.

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Section: Discussionmentioning

confidence: 99%

Water diffusion in complex systems measured by PGSE NMR using chemical shift selective stimulated echo: Elimination of magnetization exchange effects

Meikle

Keizer

Separovic

et al. 2021

The Journal of Chemical Physics

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“…The concentration of CGC of this gelator in squalane was 0.02 wt % (one of the lowest values for an oil gelator). Kowalczuk has chosen a methyl 4,6- O -( p -nitrobenzylidene)-α- d -glucopyranoside-toluene gel for the determination of different structural parameters of the gel matrix [63].…”

Section: Carbohydrate Derived Low Molecular Weight Gelatorsmentioning

confidence: 99%

Carbohydrate Derived Organogelators and the Corresponding Functional Gels Developed in Recent Time

Basu¹,

Chakraborty

Ghosh

2018

Gels

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Owing to their multifarious applicability, studies of molecular and supramolecular gelators and their corresponding gels have gained momentum, particularly in the last two decades. Hydrophobic-hydrophilic balance, different solvent parameters, gelator-gelator and gelator-solvent interactions, including different noncovalent intermolecular interactive forces like H-bonding, ionic interactions, π-π interactions, van der Waals interactions, etc., cause the supramolecular gel assembly of micro and nano scales with different types of morphologies, depending on the gelator, solvent, and condition of gelation. These gel structures can be utilized for making template inorganic superstructures for potential application in separation, generation of nanocomposite materials, and other applications like self-healing, controlled drug encapsulation, release and delivery, as structuring agents, oil-spill recovery, for preparation of semi-conducting fabrics, and in many other fields. Sugars, being easily available, inexpensive, and nontoxic natural resources with multi functionality and well-defined chirality are attractive starting materials for the preparation of sugar-based gelators. This review will focus on compilation of sugar derived organogelators and the corresponding gels, along with the potential applications that have been

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NMR of soft matter systems

Wallace¹,

Khimyak²

2020

Nuclear Magnetic Resonance

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This chapter summarises recent advances in solution, HR-MAS and solid-state NMR techniques to study the structure and dynamics of soft matter. NMR enjoys widespread use in the analysis of gels, liquid crystals, polymer solutions and surfactants. Rather than focus on each class of soft matter in turn, this chapter is instead arranged in terms of the NMR techniques themselves in the hope of stimulating the translation of methodologies between the traditional branches of soft matter science. Original research articles published between January 2015 and March 2020 are discussed.

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The structural parameters of rigid matrix of saccharide-based gel described by short and long diffusion regime analysis

Cited by 3 publications

References 39 publications

Water diffusion in complex systems measured by PGSE NMR using chemical shift selective stimulated echo: Elimination of magnetization exchange effects

Water diffusion in complex systems measured by PGSE NMR using chemical shift selective stimulated echo: Elimination of magnetization exchange effects

Carbohydrate Derived Organogelators and the Corresponding Functional Gels Developed in Recent Time

NMR of soft matter systems

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