Influence of the surface charge on the permeate flux in the dead-end filtration with ceramic membranes

Moritz, Tassilo; Benfer, S.; Árki, Pál; Tomandl, G.

doi:10.1016/s1383-5866(01)00080-6

Cited by 76 publications

(49 citation statements)

References 11 publications

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“…The relationships between -potential and the streaming potential dU or the streaming current dI are linear, with the slope dU/dp, resp. dl/dp [9,24,30,32,34,36,37]. Streaming potential dU or alternatively the streaming current dI are detected by electrodes placed at both sides of the sample.…”

Section: Principlementioning

confidence: 99%

“…It is an important physico-chemical property of cellulose [6], glass, metals, textile fabrics [7,8], wafers, ceramics [9], etc., giving information about chemistry, polarity, swelling, porosity and other surface characteristics. Zeta potential is used for characterization of natural and synthetic fibres and in investigation of their hydrophilicity, which is important for their interactions with dyes and surfactants [5,6,8].…”

Section: Introductionmentioning

confidence: 99%

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Electrokinetic Potential and Other Surface Properties of Polymer Foils and Their Modifications

Kolská¹,

Makajová²,

Kolářová³

et al. 2013

Polymer Science

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Section: Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrokinetic Potential and Other Surface Properties of Polymer Foils and Their Modifications

Kolská¹,

Makajová²,

Kolářová³

et al. 2013

Polymer Science

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“…In fact, it is well-known that the hydrolysis rate of a metal alkoxide decreases when increasing the size of the alkyl group (e.g., ethoxide, propoxide, butoxide) as a consequence of the positive partial charge of the metal atom, which decreases with alkyl chain length, as shown by many authors. [2][3][4][5][6][7][8] Metal alkoxides are often dissolved in organic solvents before hydrolysis is performed. The most often used solvents are parent alcohols, which have the same number of carbon atoms as the metal alkoxide.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixing and Other Operating Parameters in Sol−Gel Processes

Marchisio

Omegna

Barresi

et al. 2008

Ind. Eng. Chem. Res.

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In this work the effect of mixing on a sol-gel process is quantitatively investigated. Titanium dioxide synthesis from titanium tetra-isopropoxide is used as a test reaction. Solutions of titanium alkoxide in isopropyl alcohol and water in isopropyl alcohol are mixed in a special mixing device (i.e., vortex reactor) at different mixing rates, and the effect of mixing is quantified and compared with the effect of the other relevant operating parameters, namely the water to alkoxide, acid to alkoxide ratios, and alkoxide initial concentration. Dynamic light scattering, specific surface area measurement through nitrogen adsorption, X-ray diffraction, and field emission scanning electron microscopy are employed to determine particle size distribution, morphology, and crystallite size of the different particulate products (i.e., sols, gels, powders) obtained before and after thermal treatments under different synthesis conditions. A factorial design is used to plan the experimental campaign and results show that the role of mixing cannot be neglected. Moreover results show that mixing can be actively used to control the final product characteristics and must be taken into account when a process is transferred from the laboratory to the industrial scale. Eventually a scale-up criterion based on our previous work will be discussed.

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“…One of the typical measuring configurations consists in the tangential measurement of the streaming potential/current, which is generated by forcing a liquid to flow in the channel between two flat samples that are facing each other. [21][22][23][24][25] This flow pulls the charges of the diffuse layer, generating a potential/current that relates to the zeta potential through the wellknown equation derived by von Helmholz and von Smoluchowski (Eq. 1):…”

Section: Theorymentioning

confidence: 99%

Impact of Porosity and Electrolyte Composition on the Surface Charge of Hydroxyapatite Biomaterials

Español

Mestres

Luxbacher

et al. 2016

ACS Appl. Mater. Interfaces

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The success or failure of a material when implanted in the body is greatly determined by the surface properties of the material and the host tissue reactions. The very first event that takes place after implantation is the interaction of soluble ions, molecules and proteins from the biological environment with the material surface leading to the formation of an adsorbed protein layer that will later influence cell attachment. In this context, the particular topography and surface charge of a material become critical as they influence the nature of the proteins that will adsorb. However, very limited information is available on the surface charge of porous substrates. Only until very recently the determination of the zeta potential on porous membranes has been accurately determined. The goal of this work was to implement the previous findings for the determination of the zeta potential of a series of porous hydroxyapatite (HA) substrates and to assess how porosity affects the measurements. In addition, studies using various electrolytes were also performed to prove how the specific affinity of certain ions for HA can further impact surface charge. The results showed that all materials exhibited very similar external surface charge (~ -23 mV), consistent with their almost identical topographies.However, the presence of interconnected pores underneath the sample surface resulted in an additional internal zeta potential that varied with the porosity content. Measurements with different electrolytes confirmed the selectivity of divalent ions for HA underlying the importance of testing biomaterials using relevant electrolytes.3

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Influence of the surface charge on the permeate flux in the dead-end filtration with ceramic membranes

Cited by 76 publications

References 11 publications

Electrokinetic Potential and Other Surface Properties of Polymer Foils and Their Modifications

Electrokinetic Potential and Other Surface Properties of Polymer Foils and Their Modifications

Effect of Mixing and Other Operating Parameters in Sol−Gel Processes

Impact of Porosity and Electrolyte Composition on the Surface Charge of Hydroxyapatite Biomaterials

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