Limestone nanoparticles as nanopore templates in polymer membranes: narrow pore size distribution and use as self-wetting dialysis membranes

Kellenberger, Christoph R.; Pfleiderer, Florian C.; Raso, Renzo A.; Burri, Cornelia H.; Schumacher, Christoph M.; Grass, Robert N.; Stark, Wendelin J.

doi:10.1039/c4ra12613k

Cited by 17 publications

(22 citation statements)

References 38 publications

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“…Surface modification such as self‐assembly and radiation induced polymerization and blending of membrane materials with modifiers such as copolymers and nano‐particles are the most common approaches for the membrane performance enhancement . Various inorganic particles such as holloysite nanotube clay, TiO 2, Al 2 O 3, ZnO, SiO 2, Fe 3 O 4, CaO 3 and addition of metal‐organic frame work (MOF) have been utilized to fabricate inorganic‐polymer composite membranes. Scrutiny of the literatures reveals that silica nano‐particles are the most popularly used filler for improving membranes performance.…”

Section: Introductionmentioning

confidence: 99%

Enhanced water flux through ultrafiltration polysulfone membrane via addition‐removal of silica nano‐particles: Synthesis and characterization

Habibi

Nematollahzadeh

2016

J of Applied Polymer Sci

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In the present paper, hierarchically structured ultrafiltration polysulfone (PSf) membrane was prepared to explore the effect of addition and subsequent removal of SiO 2 nano-particles on the membrane morphology, hydrophilicity, and separation properties. The PSf based membranes namely PSf, PSf/SiO 2 and PSf/WSiO 2 (i.e. SiO 2 nano-particles was acid-washed and removed from PSf/SiO 2 ), were synthesized and characterized by different characterization methods. Pure water flux through the membranes was determined using a filtration unit operating at a continuous dead-end flow mode. The modification enhanced the morphology, hydrophobicity, porosity and transport properties of the modified membranes, although the molecular weight cut-off (MWCO) of the membranes was not changed considerably. In comparison, PSf/WSiO 2 membrane exhibited excellent pure water flux (about 4.5 times the flux of PSf, and 17 times the flux of PSf/SiO 2 ), although antifouling property of PSf/SiO 2 in separation of bovine serum albumin (BSA) was better than that of PSf and PSf/WSiO 2 membranes. The results suggested that the addition/removal of sacrificial solid fillers within/from a membrane matrix may provide a promising strategy to enhance PSf membrane transport property. V C 2016Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43556.

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Section: Introductionmentioning

confidence: 99%

Enhanced water flux through ultrafiltration polysulfone membrane via addition‐removal of silica nano‐particles: Synthesis and characterization

Habibi

Nematollahzadeh

2016

J of Applied Polymer Sci

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“…The membranes are produced by the template removal method, in which CaCO 3 acts as a pore forming template (Scheme ). Previous work has shown that in order to enhance the waterproofing, the CaCO 3 can be coated with stearic acid (depicted as C18), which stays inside the substrate's pores after removing the limestone in aqueous acid .…”

Section: Resultsmentioning

confidence: 99%

“…The serious concerns regarding environmental sustainability of the outdoor textile industry and the unclear fate and human health effects of such persistent fluoro‐chemicals call for a more sustainable, i.e., fluorine‐free fabrication of membranes. More recently, we introduced a versatile approach to sustainable clothing membrane fabrication by producing mesoporous membranes and a hard template removal method . More specifically, soluble pore templates particles (e.g., CaCO 3 (limestone), SrCO 3 , or ZnO) are first incorporated into a polymer, spread out as a film, and dried to a composite film.…”

Section: Introductionmentioning

confidence: 99%

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Thermoresponsive Microspheres as Smart Pore Plugs: Self‐Venting Clothing Membranes for Smart Outdoor Textiles

Stucki

Stöckli

Stark

2018

Macro Materials & Eng

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Rapidly changing temperature and precipitation conditions are challenging for clothing textiles when required to keep us warm under harsh weather. A smart functional outdoor membrane based on thermoresponsive poly(N‐isopropylacrylamide) (PNIPAM) microspheres embedded into a polyurethane matrix is developed. Selective dissolution of two‐particle composite precursors affords porous membranes with PNIPAM microspheres located within the pore walls. Adjusting the mean size of the thermoresponsive microplug permits us to switch membrane breathability depending on outdoor temperature. In cold conditions, the textile fabric closes off pores and reduces heat loss, as to keep a person warmer. Under hot conditions, the PNIPAM microplugs open up, and self‐vent the jacket, allowing for high breathability and heat transfer. The resulting smart membranes are tested according to international standards. The principle of phase separation based microplug positioning within pores, and selective opening and closing of pores may enable other smart applications in material sciences, biology, and other consumer products.

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“…Membranes from polyethersulfone by Kellenberger et al did not show significantly different pore forming behavior upon addition of the plasticizer. [168] Performance of the membranes was tested in buffer exchange application comparing them to commercially available membranes (Millipore V50 and Spectrum 1000 kDa). The plasticized PES membranes, although not showing significantly different contact angles on the surface, showed a highly increased performance compared to membranes without plasticizer.…”

Section: Direct Templatesmentioning

confidence: 99%

Porous Polymer Membranes by Hard Templating – A Review

2017

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Membranes are designed to bridge a precise separation process at the nanoscale with industrial applications running at cubic meters per hour. This review outlines materials applied in membrane production with a particular focus on polymers. Membrane performance and created value are directly linked to controlled pore formation. Their economic relevance has created a number of large companies and associated academic research at top institutions. The authors review, therefore, starts from well-established techniques applied in products and then moves on to evolving concepts from academia. Pore formation through hard templating is a versatile field for separation processes. A more detailed view is given on the two known concepts for nanopore formation, namely colloidal templates and random hard salt templating. A comparison between these two concepts underlines their relevance to combine a process specific separation with large scale manufacturing requirements (i.e., upscale possibility, flexible process control and environmental impact).

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Limestone nanoparticles as nanopore templates in polymer membranes: narrow pore size distribution and use as self-wetting dialysis membranes

Cited by 17 publications

References 38 publications

Enhanced water flux through ultrafiltration polysulfone membrane via addition‐removal of silica nano‐particles: Synthesis and characterization

Enhanced water flux through ultrafiltration polysulfone membrane via addition‐removal of silica nano‐particles: Synthesis and characterization

Thermoresponsive Microspheres as Smart Pore Plugs: Self‐Venting Clothing Membranes for Smart Outdoor Textiles

Porous Polymer Membranes by Hard Templating – A Review

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