Role of electrostatic interactions in particle adsorption

Adamczyk, Zbǐgniew; Warszyński, Piotr

doi:10.1016/0001-8686(95)00281-2

Cited by 241 publications

(248 citation statements)

References 136 publications

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“…Therefore, a uniform fouling reagent with tunable surface charge is essential to describe the role of electrostatic interaction while membrane fouling, e.g., polystyrene (PS) beads. As already described by several groups, PS beads can be used as model fouling reagent [31][32][33][34][35][36][37][38][39][40][41][42][43][44]. Nevertheless, an investigation regarding the fouling of differently charged PS beads is missing so far.…”

Section: Polystyrene Beads As Model Fouling Reagentmentioning

confidence: 99%

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

et al. 2015

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Abstract:In this work we aim to show that the overall surface potential is a key factor to understand and predict anti-fouling characteristics of a polymer membrane. Therefore, polyvinylidene fluoride membranes were modified by electron beam-induced grafting reactions forming neutral, acidic, alkaline or zwitterionic structures on the membrane surface. The differently charged membranes were investigated regarding their surface properties using diverse analytical methods: zeta potential, static and dynamic water contact angle, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Porosimetry measurements proved that there is no pore blocking due to the modifications. Monodisperse suspensions of differently charged polystyrene beads were synthesized by a radical emulsion polymerization reaction and were used as a model fouling reagent, preventing comparability problems known from current literature. To simulate membrane fouling, different bead suspensions were filtered through the membranes. The fouling characteristics were investigated regarding permeation flux decline and concentration of model fouling reagent in filtrate as well as by SEM. By considering electrostatic interactions equal to hydrophobic interactions we developed a novel fouling test system, which enables the prediction of a membrane's fouling tendency. Electrostatic forces are dominating, especially when charged fouling reagents are present, and can help to explain fouling characteristics that cannot be explained considering the surface wettability.

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Section: Polystyrene Beads As Model Fouling Reagentmentioning

confidence: 99%

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

et al. 2015

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“…An extensive analysis of the different approximations is given in [34,51] and some consequences on the differential capacitance of the EDL are studied in [52]. We use the approximation provided in [53,54], that leads to:…”

Section: Point-like Vs Finite-volume Ionsmentioning

confidence: 99%

Predictions of the maximum energy extracted from salinity exchange inside porous electrodes

Jiménez

Fernández

Ahualli

et al. 2013

Journal of Colloid and Interface Science

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Capacitive energy extraction based on double layer expansion (CDLE) is the name of a new method devised for extracting energy from the exchange of fresh and salty water in porous electrodes. It is based on the change of the capacitance of electrical double layers (EDLs) at the electrode/solution interface when the concentration of the bulk electrolyte solution is modified. The use of porous electrodes provides huge amounts of surface area, but given the typically small pore size, the curvature of the interface and EDL overlap should affect the final result. This is the first aspect dealt with in this contribution: we envisage the electrode as a swarm of spherical particles, and from the knowledge of their EDL structure, we evaluate the stored charge, the differential capacitance and the extracted energy per CDLE cycle. In all cases, different pore radii and particle sizes and possible EDL overlap are taken into account. The second aspect is the consideration of finite ion size instead of the usual point-like ion model: given the size of the pores and the relatively high potentials that can be applied to the electrode, excluded volume effects can have a significant role. We find an extremely strong effect: the double layer capacitance is maximum for a certain value of the surface potential. This is a consequence of the limited ionic concentration at the particle-solution interface imposed by the finite size of ions, and leads to the presence of two potential ranges: for low electric potentials the capacitance increases with the ionic strength, while for large potentials we find the opposite trend. The consequences of these facts on the possibility of net energy extraction from porous electrodes, upon changing the solution in contact with them, are evaluated.

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“…The sub ject of col lo i dal par ti cle elec tros ta tic in te rac tions has been wi dely stu di ed [17][18][19][20]23 . Hogg et al 19 gave the fol lo wing ap pro xi ma te analy ti cal ex pres si on, va lid for low sur fa ce po ten ti als, of the free energy chan ge for two pla ne pa ral lel dou ble la yers which are brought from in fi nity to a dis tan ce D apart:…”

Section: The Elec Tros Ta Tic In Te Rac Ti Onsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…In our group we have stu di ed the at tach ment of he ma ti te par ticles onto mer cury and sil ver sur fa ces un der dif fe rent condi ti ons [13][14][15][16] . The o re ti cal work has been ma inly de vo ted to ex ten si on of the DLVO the ory of col lo id sta bi lity 17 to he tero co gu la ti on (co a gu la ti on of dis si mi lar par ti cles) [18][19][20] or to the ki ne tics of de po si ti on [21][22][23] .Mi xed sol vent me dia has been used to study the io nic equi li bri um at the he ma ti te/so lu ti on in ter fa ce 24 . In this work the in flu en ce of the sol vent me dia is stu di ed, by me asu ring the num ber of he ma ti te par ti cles at ta ched onto mercury sur fa ces from sus pen si ons in wa ter-ethanol mix tu res, using NaClO 4 as the sup por ting elec troly te.…”

mentioning

confidence: 99%

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Deposition of colloidal hematite onto mercury from water-ethanol mixtures

Andrade¹,

Molina²,

Posadas³

1997

J. Braz. Chem. Soc.

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A ade ren ça de par tí cu las de he ma ti ta (a Fe 2O3) so bre ele tro dos de mer cú rio foi es tu da da em mis tu ras de água-etanol atra vés de con ta gem so bre ima gens de um mi cros có pio óti co. Qu an do o con te ú do de eta nol é pe que no, o nú me ro de par tí cu las ade ri das de cres ce com o au me n to da con cen tra ção de eta nol. Para uma fra ção mo lar de eta nol de 0,2, o nú me ro de par tí cu las pas sa por um mí ni mo, au men tan do para ma i o res con cen tra ções de eta nol. Mo di fi can do o po te n ci al ele tró di co, ob ser va-se que as cur vas nú me ro de par tí cu las vs. Fra ção mo lar de eta nol pode ser ex pli ca da com base na de pen dên cia com a com po si ção do sol ven te das ener gi as de in te r a ção par tí cu la/so lu ção e me tal/so lu ção.The ad he ren ce of he ma ti te ( αFe 2O3) par ti cles onto mer cury elec tro des in wa ter-ethanol mix tu res has been stu di ed by coun ting using op ti cal mi cros co pe ima ges. The num ber of at tached par ti cles, when the et ha nol con tent is small, de cre a ses as the et ha nol con cen tra t i on in cre ases. At a mole frac ti on of et ha nol near to 0.2, the num ber of par ti cles goes through a mi ni mum and then it in cre a ses with et ha nol con cen tra ti on. When the elec tro de po ten ti al is mo di fi ed, curves of the num ber of par ti cles vs. et ha nol mole frac ti on with the same sha pe are found, but which cross each ot her.The de pen den ce on the et ha nol con cen tra ti on can be ex pla i ned ba sed on the de pen den c e of par ti cle/so lu ti on and me tal/so lu ti on in te rac ti on ener gi es with the sol vent com po s i ti on. Key words: he ma ti te ad he si on, me tal sur fa ce, wa ter-ethanol mix tu res Intro duc ti onThe at tach ment of col lo i dal par ti cles onto me tal lic surfa ces is a fi eld re le vant to many ap pli ed pro blems, such as cor ro si on pro tec ti on, bi o fou ling and se mi con duc tor ma nufac tu ring, to men ti on only a few. Ho we ver, it has not re ce ived much at ten ti on in fun da men tal stu di es. The re are some pu blis hed pa pers on ad he ren ce of par ti cles to sur fa ces (usually non con duc ting) [1][2][3][4][5][6] and to dif fe rent par ti cles [7][8][9][10][11][12] , whe re the sur fa ce elec tric po ten ti al can not be ea sily mo di fi ed. In our group we have stu di ed the at tach ment of he ma ti te par ticles onto mer cury and sil ver sur fa ces un der dif fe rent condi ti ons [13][14][15][16] . The o re ti cal work has been ma inly de vo ted to ex ten si on of the DLVO the ory of col lo id sta bi lity 17 to he tero co gu la ti on (co a gu la ti on of dis si mi lar par ti cles) [18][19][20] or to the ki ne tics of de po si ti on [21][22][23] .Mi xed sol vent me dia has been used to study the io nic equi li bri um at the he ma ti te/so lu ti on in ter fa ce 24 . In this work the in flu en ce of the sol vent me dia is stu di ed, by me asu ring the num ber of he ma ti te par ti cles at ta ched onto mercury sur fa ces from sus pen si ons in wa ter-ethanol mix tu re...

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Role of electrostatic interactions in particle adsorption

Cited by 241 publications

References 136 publications

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

Tailoring Membrane Surface Charges: A Novel Study on Electrostatic Interactions during Membrane Fouling

Predictions of the maximum energy extracted from salinity exchange inside porous electrodes

Deposition of colloidal hematite onto mercury from water-ethanol mixtures

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