Modification of ceramic membrane surfaces using phosphoric acid and alkyl phosphonic acids and its effects on ultrafiltration of BSA protein

Randon, Jérôme; Blanc, P.; Paterson, Russell

doi:10.1016/0376-7388(94)00183-y

Cited by 184 publications

(183 citation statements)

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“…Grafting polymers on ceramic membranes offers the opportunity to tailor and manipulate interfacial properties, while retaining the mechanical strength and geometry of the supported ceramic material. Several types of molecules can be used for modification of inorganic materials, for instance phosphate derivatives [4][5][6], chlorosilanes and alkoxysilanes [2,3,7,8], polysiloxanes [9] and Grignard reactants [10]. The strategy employed in this paper, is grafting with polydimethylsiloxanes.…”

Section: Introductionmentioning

confidence: 99%

“…Because no solvents are used in the gas or vapour phase deposition method, the presence of water can be excluded. Still modification of metal oxides with different kinds of organosilanes is mostly performed by solution phase methods [4][5][6][7][16][17][18][19][20][21][22][23]27,28]. In literature some studies are reported on gas-solid reactions of silanes onto metal oxide surfaces [22,24,25].…”

Section: Introductionmentioning

confidence: 99%

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Chemical modification/grafting of mesoporous alumina with polydimethylsiloxane (PDMS)

et al. 2015

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A method for polydimethylsiloxane grafting of alumina powders is described which involves chemical modification of the surface of mesoporous (5 nm) γ-alumina flakes with a linker (3-aminopropyltriethoxysilane: APTES), either by a solution phase (SPD) or a vapour phase (VPD) reaction, followed by PDMS grafting. The systems were analysed by FTIR, gas adsorption/desorption and TGA. Grafting is proven by FTIR for all cases, meaning that a covalent bond exists between inorganic particle and organic moiety. It is demonstrated that the way of applying APTES (by SPD or VPD) has an effect on the morphology of linker as well as of PDMS. A more controlled grafting of the APTES linker on γ-alumina is possible by the VPD method, resulting in efficient grafting and good infiltration of PDMS in the pores of the inorganic system. Stability tests on these PDMS grafted alumina show no degradation after 14 days soaking in a wide range of solvents. Surface modification of metal oxide particles by organic moieties via a chemical reaction can adapt its interfacial properties and renders a high chemical stability of these inorganic-organic hybrids. This validates the use of these materials under severe applications like in membranes for solvent nanofiltration or for protein immobilization and resin modification in e.g. chromatographic applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical modification/grafting of mesoporous alumina with polydimethylsiloxane (PDMS)

et al. 2015

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“…In the literature different methods were proposed for placing a charge on the surface of ultrafiltration and reverse osmosis membranes, such as treatment with chemical reagents, irradiation [4,9,[11][12][13][14][15][16] and proteins [17][18][19]. The layer-by-layer (LBL) assembly technique [20] was also used as an alternative method for creating either positively or negatively charged surfaces [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polyacrylonitrile membranes modified with polyelectrolyte deposition for separating similar sized proteins

Mahlicli

Altınkaya

Yürekli

2012

Journal of Membrane Science

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a b s t r a c tOne of the challenges faced by ultrafiltration membranes is to separate proteins with a small difference in their molecular weights. Recently, some researchers tried to overcome this problem by using charged membranes. This study examined the use of layer by layer deposition of polyelectrolytes on the chemically-modified polyacyronitrile membrane to increase the selectivity of the ultrafiltration. The membranes were prepared by wet-phase inversion technique and polyethylenimine (PEI) and alginate (ALG) were chosen as cationic and anionic polyelectrolytes for the modification of the surfaces. Sieving coefficient data were obtained with myoglobin and lysozyme as model proteins. The influences of solution pH, ionic strengths of the protein and polyelectrolyte solution and the number of polyelectrolyte bilayers on both selectivity and throughput were investigated. The highest selectivity and throughput were achieved with the 1-bilayer PEI-ALG coated polyacrylonitrile (PAN) membrane. Increasing the number of coating bilayers or the ionic strength of the protein solution or adding salt into the polyelectrolyte coating solution decreased both the maximum selectivity and throughput of the modified membranes.

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“…Despite the large size of the phosphonic acid headgroup and the fact that the surface bonding is not homogeneous, monolayers on this substrate display a high degree of conformational order, similar to SAMs on planar surfaces. Octadecylphosphonic acids adsorb less strongly onto TiO 2 and domains of disordered chains are present, specially in the region of terminal chain segments (the use of short acids causes the formation of dense layers) [173]. Most likely, the octadecylphosphonic acid molecules are attached to the surface in a bidentate fashion (free P-OH groups).…”

Section: Chaptermentioning

confidence: 99%

Development and characterization of polymer-grafted ceramic membranes for solvent nanofiltration

Melo

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Modification of ceramic membrane surfaces using phosphoric acid and alkyl phosphonic acids and its effects on ultrafiltration of BSA protein

Cited by 184 publications

References 16 publications

Chemical modification/grafting of mesoporous alumina with polydimethylsiloxane (PDMS)

Chemical modification/grafting of mesoporous alumina with polydimethylsiloxane (PDMS)

Preparation and characterization of polyacrylonitrile membranes modified with polyelectrolyte deposition for separating similar sized proteins

Development and characterization of polymer-grafted ceramic membranes for solvent nanofiltration

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