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1D Measurement of Sodium Ion Flow in Hydrogel After a Bath Concentration Jump.

Roos RW, Pel L, Huinink HP, Huyghe JM - Ann Biomed Eng (2015)

Bottom Line: Then a reversed step is applied, and ion flow is measured for another 5 days.During the measurement, the cylindrical sample is radially confined and allowed to swell in the axial direction.The best fit results were obtained for D[Formula: see text] cm(2)/s and D[Formula: see text] cm(2)/s, at 25 degrees centigrade.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands, rroos@gmail.com.

ABSTRACT
NMR is used to measure sodium flow driven by a 1D concentration gradient inside poly-acrylamid (pAA) hydrogel. A sodium concentration jump from 0.5 M NaCl to 0 M NaCl is applied at the bottom of a cylindrical pAA sample. The sodium level and hydrogen level are measured as a function of time and position inside the sample for 5 days. Then a reversed step is applied, and ion flow is measured for another 5 days. During the measurement, the cylindrical sample is radially confined and allowed to swell in the axial direction. At the same time, sodium and moisture in the sample are measured on a 1D spatial grid in the axial direction. A quadriphasic mixture model (Huyghe and Janssen in Int J Eng Sci 35:793, 1997) is used to simulate the results and estimate the diffusion coefficient of sodium and chloride. The best fit results were obtained for D[Formula: see text] cm(2)/s and D[Formula: see text] cm(2)/s, at 25 degrees centigrade. Different time constants were observed for swelling and deswelling.

No MeSH data available.


Related in: MedlinePlus

The total difference between experiment and simulation is minimized for D cm/s and D cm/s.
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Fig6: The total difference between experiment and simulation is minimized for D cm/s and D cm/s.

Mentions: Minimizing the error, yields a converging minimum for the diffusion coefficients of sodium and chloride (Fig. 6):


1D Measurement of Sodium Ion Flow in Hydrogel After a Bath Concentration Jump.

Roos RW, Pel L, Huinink HP, Huyghe JM - Ann Biomed Eng (2015)

The total difference between experiment and simulation is minimized for D cm/s and D cm/s.
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4495263&req=5

Fig6: The total difference between experiment and simulation is minimized for D cm/s and D cm/s.
Mentions: Minimizing the error, yields a converging minimum for the diffusion coefficients of sodium and chloride (Fig. 6):

Bottom Line: Then a reversed step is applied, and ion flow is measured for another 5 days.During the measurement, the cylindrical sample is radially confined and allowed to swell in the axial direction.The best fit results were obtained for D[Formula: see text] cm(2)/s and D[Formula: see text] cm(2)/s, at 25 degrees centigrade.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands, rroos@gmail.com.

ABSTRACT
NMR is used to measure sodium flow driven by a 1D concentration gradient inside poly-acrylamid (pAA) hydrogel. A sodium concentration jump from 0.5 M NaCl to 0 M NaCl is applied at the bottom of a cylindrical pAA sample. The sodium level and hydrogen level are measured as a function of time and position inside the sample for 5 days. Then a reversed step is applied, and ion flow is measured for another 5 days. During the measurement, the cylindrical sample is radially confined and allowed to swell in the axial direction. At the same time, sodium and moisture in the sample are measured on a 1D spatial grid in the axial direction. A quadriphasic mixture model (Huyghe and Janssen in Int J Eng Sci 35:793, 1997) is used to simulate the results and estimate the diffusion coefficient of sodium and chloride. The best fit results were obtained for D[Formula: see text] cm(2)/s and D[Formula: see text] cm(2)/s, at 25 degrees centigrade. Different time constants were observed for swelling and deswelling.

No MeSH data available.


Related in: MedlinePlus