Water self-diffusion in chlorella sp. studied by pulse field gradient NMR

Cho, Choong-Hun; Hong, Young-Shick; Kang, Kirim; Volkov, V. I.; Skirda, V. D.; Lee, Jetty Chung‐Yung; Lee, Cherl‐Ho

doi:10.1016/s0730-725x(03)00206-6

Cited by 50 publications

(43 citation statements)

References 22 publications

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“…This effect indicates that the lithium ion self-diffusion is restricted. The size of restriction d can be estimated from the Einstein equation d = (6Dstd) 1/2 [20]. The d value is about 10 -6 m. This result agrees well with electron spin resonance data.…”

Section: Resultssupporting

confidence: 83%

Ionic and molecular Self-Diffusion in Ion-Exchange materials for fuel energetics studied by pulsed field gradient NMR

Volkov

Волков

2005

Appl. Magn. Reson.

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Pulsed field gradient nuclear magnetic resonance technique was applied to investigate the self-diffusion mechanism of water, alcohol molecules and Li + counterions in sulfocation exchangers with different structures of the polymeric mat¡ [t was shown that in the homogeneous perfluorinated sulfocation exchange membranes the ionic and water translation motions are controled by the hydrogen bond network forming in ionogenic channels at the high water content. At the low solvent content, the self-diffusion coefficients of methanol and ethanol are higher than the water self-diffusion coefficients. The influence of non-ion-exchange sorbed electrolyte on Li + self-diffusion coefficients was observed in the heterogeneous sulfocation exchanger KU-23.

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Section: Resultssupporting

confidence: 83%

Ionic and molecular Self-Diffusion in Ion-Exchange materials for fuel energetics studied by pulsed field gradient NMR

Volkov

Волков

2005

Appl. Magn. Reson.

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“…This restriction size indicates the biological cell size with a permeable membrane [12,13]. However, in this study, it may be supposed that a network is formed in the shape of a network cage by restricted POE-SMO micelles.…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 76%

“…The self-diffusion coefficient of surfactant-water dispersion was measured on a homebuilt PFG NMR device [12,13]. The measurements were carried out on the ~H nuclei with a frequency of 63 MHz.…”

Section: Pfg Nmr Measurementmentioning

confidence: 99%

“…In the case of t d greater than 10 ms, the self-diffusion coefficients of POE-SMO micelles were not changed. At short t a the decrease in the self-diffusion coefficients of POE-SMO micelles Dsm as Dsm ec ta -~ is due to restriction of self-diffusion [12][13][14][20][21][22]. The restriction size a may be estimated from the Einstein equation…”

Section: Estimation Of the Hydrodynamic Radius Of A Micellementioning

confidence: 99%

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Structural and dynamic properties of polyoxyethylene sorbitan monooleate micelle in water dispersion studied by pulsed field gradient NMR

et al. 2005

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The diffusion phenomenon of a nonionic surfactant, polyoxyethylene sorbitan monooleate (POE-SMO), micelle in aqueous solution was investigated by pulsed field gradient nuclear magnetic resonance (PFG NMR) with a high gradient strength of 17.4 T/m at the diffusion time t d varied from 3 to 300 ms. This high gradient strength allowed us to measure the slow self-diffusion coefficient of POE-SMO micelle, and the short diffusion time below 10 ms showed the restricted diffusion of the micelle. At the short t d the self-diffusion of the miceUe was restricted and the restricted sizes were 1.8, 1.5, and 0.8 gm for the POE-SMO concentration of 100, 200 and 300 mM, respectively, and 0.6 gm for the POE-SMO only. The possible reason of this restriction was assumed to be the formation of a spatial network ora micellar clustering. Furthermore, a proton exchange between water molecule and surfactant OH group on the micelle surface was proposed. With respect to this proposal, the residence time of the proton at the micelle surface and the thickness of the surface were investigated from proton self-diffusion coefficients by PFG NMR.

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“…Furthermore, MR imaging is not able to quantify water transport but only to visualize the internal structures. Recent advances in pulsed field gradient (PFG)-NMR techniques and theoretical developments make it possible to quantify the molecular diffusivities in plant and microbial cells (Cho et al, 2003;Hong, Suh, Yoon, Skirda, Volkov, & Lee, 2004;Suh et al, 2003;Zakhartchenko, Skirda, & Valiullin, 1998), and in food matrix (Hong & Lee, 2006).…”

Section: Introductionmentioning

confidence: 99%