Deposition of a Titania Coating on Silica by Means of the Chemical Surface Coating†

Langmuir ◽  
1999 ◽  
Vol 15 (18) ◽  
pp. 5807-5813 ◽  
Author(s):  
K. Schrijnemakers ◽  
N. R. E. N. Impens ◽  
E. F. Vansant
Keyword(s):  
Surface Coating ◽  
Chemical Surface ◽  
Titania Coating

scholarly journals Enhancement of nonwoven cellulose triacetate forward-osmosis membranes by surface coating modification

2017 ◽  
Vol 6 (4) ◽  
pp. 124
Author(s):  
Hanaa Aly ◽  
Hanaa Gadallah ◽  
Sahar Ali ◽  
Rania Sabry
Keyword(s):  
Surface Coating ◽  
High Performance ◽  
Forward Osmosis ◽  
Cellulose Triacetate ◽  
Structure Characterization ◽  
Dense Layer ◽  
Coating Materials ◽  
Chemical Surface ◽  
Membrane Performance ◽  
High Efficient

Forward osmosis (FO) is considered as one of the emerging techniques in membrane technology. The enhancement of FO performance is governed by two major factors: the first one is development of high-performance draw solutions and the second is utilizing of high efficient FO membranes. The aim of this work is to investigate chemical surface coating modification of commercial nonwoven forward osmosis membrane with new hydrophilic coating materials namely, o-phenylene di-amine and benzoyl chloride. The effect of coating addition at different concentrations was studied. The membrane morphology and chemical structure characterization of modified membranes proved the formation of dense layer and higher membrane porosity. Finally, it was demonstrated that increasing of coating material concentration gradually increases porosity and membrane performance till 0.75 g/l. By further increasing of coating materials, the porosity and membrane performance tend to decrease.

Synthesis of a polysilazane layer on silica gel by chemical surface coating

1996 ◽  
Vol 92 (21) ◽  
pp. 4285 ◽  
Author(s):  
Nathalie R. E. N. Impens ◽  
Karl Possemiers ◽  
Etienne F. Vansant
Keyword(s):  
Silica Gel ◽  
Surface Coating ◽  
Chemical Surface

Effects of chemical surface coating (Rain-ZTM) on the powder yield of spray-drying: a preliminary approach

2017 ◽  
pp. 165-174
Author(s):  
N. Ramlan ◽  
N.W.M. Zamri ◽  
M.Y. Maskat ◽  
S. Aizad ◽  
S.I. Zubairi
Keyword(s):  
Spray Drying ◽  
Surface Coating ◽  
Chemical Surface

Antithrombin III Binding to Surface Immobilized Heparin and Its Relation to F Xa Inhibition

1987 ◽  
Vol 58 (04) ◽  
pp. 1064-1067 ◽  
Author(s):  
K Kodama ◽  
B Pasche ◽  
P Olsson ◽  
J Swedenborg ◽  
L Adolfsson ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Strength ◽  
Surface Coating ◽  
Antithrombin Iii ◽  
Lower Class ◽  
Biologically Active ◽  
High Affinity ◽  
Heparin Coating ◽  
Continuous Surface ◽  
Approximate Molecular Weight

SummaryThe mode of F Xa inhibition was investigated on a thromboresistant surface with end-point attached partially depoly-merized heparin of an approximate molecular weight of 8000. Affinity chromatography revealed that one fourth of the heparin used in surface coating had high affinity for antithrombin III (AT). The heparin surface adsorbed AT from both human plasma and solutions of purified AT. By increasing the ionic strength in the AT solution the existence of high and low affinity sites could be shown. The uptake of AT was measured and the density of available high and low affinity sites was found to be in the range of 5 HTid 11 pic.omoles/cmf, respectively Thus the estimated density of biologically active high and low ailmity heparm respectively would be 40 and 90 ng/cm2 The heparin coating did not take up or exert F Xa inhibition by itself. With AT adsorbed on both high and low affinity heparin the surface had the capacity to inhibit several consecutive aliquots of F Xa exposed to the surface. When mainly high affinity sites were saturated with AT the inhibition capacity was considerably lower. Tt was demonstrated that the density of AT on both high and low affinity heparin determines the F Xa inhibition capacity whereas the amount of AT on high affinity sites limits the rate of the reaction. This implies that during the inhibition of F Xa there is a continuous surface-diffusion of AT from sites of a lower class to the high affinity sites where the F Xa/AT complex is formed and leaves the surface. The ability of the immobilized heparin to catalyze inhibition of F Xa is likely to be an important component for the thromboresistant properties of a heparin coating with non-compromized AT binding sequences.

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