G

Berg, H.F. van den; Fähnders, Walter

doi:10.1007/978-3-476-05202-5_8

Cited by 29 publications

(10 citation statements)

References 2 publications

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“…5B). The porous wall increases the mass transport due to decrease in mass transfer boundary layer [31,32]. For highly porous membrane, the contribution of electrokinectic effects on the average Sherwood number is masked and it approaches a constant value, independent of h. It can be noted that for transdermal drug delivery, a relatively less porous membrane (lower Pe W < 100) is suitable for controlling the flow behavior and consequent transport of solute by electrokinetic means.…”

Section: Resultsmentioning

confidence: 99%

Mass transport in a porous microchannel for non‐Newtonian fluid with electrokinetic effects

Mondal

2013

Electrophoresis

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Quantification of mass transfer in porous microchannel is of paramount importance in several applications. Transport of neutral solute in presence of convective-diffusive EOF having non-Newtonian rheology, in a porous microchannel was presented in this article. The governing mass transfer equation coupled with velocity field was solved along with associated boundary conditions using a similarity solution method. An analytical solution of mass transfer coefficient and hence, Sherwood number were derived from first principles. The corresponding effects of assisting and opposing pressure-driven flow and EOF were also analyzed. The influence of wall permeation, double-layer thickness, rheology, etc. on the mass transfer was also investigated. Permeation at the wall enhanced the mass transfer coefficient more than five times compared to impervious conduit in case of pressure-driven flow assisting the EOF at higher values of κh. Shear thinning fluid exhibited more enhancement of Sherwood number in presence of permeation compared to shear thickening one. The phenomenon of stagnation was observed at a particular κh (∼2.5) in case of EOF opposing the pressure-driven flow. This study provided a direct quantification of transport of a neutral solute in case of transdermal drug delivery, transport of drugs from blood to target region, etc.

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Section: Resultsmentioning

confidence: 99%

Mass transport in a porous microchannel for non‐Newtonian fluid with electrokinetic effects

Mondal

2013

Electrophoresis

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“…These results indicate that the backbone of Ac-Lys-Gln-GI!-Ile-NMA is far less rigid, and may point to a random coil. The spectral range covered by the x-protons also reflects either random conformations or restricted backbone movcinent (29). The spread of C, resonance signals (in ppm) in the various solvents is: 0.29 (D.0 H20), 0.54 (DMSO-d6) and 0.43 (TFE-d3), u.hich confirms the existence of a random-coil conformation.…”

Section: It Is Evident Frommentioning

confidence: 68%

Experimental studies and potential‐energy calculations of the blocked tetrapeptide Ac‐Lys‐Gln‐Gly‐Ile‐NMA from the third loop of a short‐chain snake venom neurotoxin

Roos

Rooyen

Wessels

1994

International Journal of Peptide and Protein Research

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The conformational space of the tetrapeptide Ac‐Lys‐Gin‐Gly‐Ile‐NMA from the β‐bend in the third loop of a short‐chain snake venom neurotoxin was investigated with the aid of energy calculations. It was shown that this peptide has a preference for an α‐helical conformation. This result was compared with the experimentally determined conformations, as observed using NMR and CD spectroscopy. With NMR spectroscopy a random‐coil conformation of the peptide is indicated in H2O, DMSO and TFE. The results from the CD experiments suggest that the peptide exists as a random coil in water, but a small population of 3‐helical conformations is present in TFE. These results indicate that additional long‐range interactions also play a role in the conformation of this tetrapeptide in the protein.

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“…More importantly, since the Sherwood number (Sh) represents the ratio between mass transfer by convection (k) and mass transfer by diffusion (D/L), increased convective rates of mass transfer combined with a decrease in rates of molecular diffusion are often correlated to increased Sherwood numbers. Moreover, the variation of properties due to the concentration polarization layer may be considered insignificant during reverse osmosis given the small thickness of the layer found under such conditions [22]. The thickness of the layer was found to decrease even further at higher temperatures, more likely indicating higher mass transfer both by convection and diffusion.…”

Section: Comparison Between Clsmm and Ilsmm Membranesmentioning

confidence: 95%

Temperature Effects on Concentration Polarization Thickness in Thin‐Film Composite Reverse Osmosis Membranes

et al. 2018

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Continuous research and development of reverse osmosis (RO) technologies has led to the production of membranes that are very effective with high salt rejection abilities. As temperature is one of the factors that affects salt rejection capabilities in membranes, this paper investigates the effect of temperature on the thickness of the concentration polarization layer (CPL) deposited on thin‐film composite seawater RO membranes. Two types of membranes were studied: those with ex situ macromolecules and those with in situ macromolecules. FilmTec's reverse osmosis system analysis design software was used to predict the variation of salt rejection and permeate flow rate with temperature. The impact of these variations on the thickness of the CPL was analyzed for different polyamide concentrations in the membrane.

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G

Cited by 29 publications

References 2 publications

Mass transport in a porous microchannel for non‐Newtonian fluid with electrokinetic effects

Mass transport in a porous microchannel for non‐Newtonian fluid with electrokinetic effects

Experimental studies and potential‐energy calculations of the blocked tetrapeptide Ac‐Lys‐Gln‐Gly‐Ile‐NMA from the third loop of a short‐chain snake venom neurotoxin

Temperature Effects on Concentration Polarization Thickness in Thin‐Film Composite Reverse Osmosis Membranes

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