Preparation of porous stainless steel hollow fibers by robotic fiber deposition

Michielsen, Bart; Chen, H.; Jacobs, Marijke; Mullens, Steven; Thijs, Ivo; Buekenhoudt, Anita; Snijkers, Frans

doi:10.1016/j.memsci.2013.02.043

Cited by 36 publications

(32 citation statements)

References 33 publications

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“…As a result these fibers are applied in a vast array of applications, for example: photocatalysis, 1,2 bio-reactor and sensors 3,4 , gas-liquid contactors, [5][6][7] membranes for demanding separations [8][9][10] , and for combined chemical reaction and molecular separation in harsh environments. [11][12][13] The small radial dimensions of the fibers are generally achieved by using the dry-wet spinning method, in which a mixture of a polymer, solvent and inorganic particles is spun into a coagulation bath.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Route to Inorganic Porous Hollow Fibers with Superior Properties

Hussein

Wit

Kappert

et al. 2015

ACS Sustainable Chem. Eng.

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This paper presents a method for the fabrication of inorganic porous hollow fibers, using ecologically benign feed materials instead of organic solvents and harmful additives. Our method is based on ionic cross-linking of an aqueous mixture of sodium alginate, inorganic particles, and a carbonate. The mixture is spun into an acidic coagulation bath, where the low pH triggers the dissociation of the carbonate into multivalent cations and carbon dioxide. The multivalent cations cross-link the alginate, thereby consolidating the 3D structure and arresting the inorganic particles. In a subsequent thermal treatment the polymer is removed and the particles are sintered together. Adequate gelation requires a sufficiently low pH of the acid bath and a sufficing buffering capacity of the acid. In addition, to facilitate thermal treatment, it appears to be crucial that the acid has a conjugated base with limited propensity for complexing cations. The environmentally-safe and sustainable lactic acid and acetic acid are shown to be convenient acids. The fibers prepared via our method have outstanding properties, such as high mechanical strength, homogeneous morphology, and sharp distribution of small pores. In addition, they are prepared using sustainable chemicals such as lactic acid and calcium carbonate.

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Section: Introductionmentioning

confidence: 99%

Sustainable Route to Inorganic Porous Hollow Fibers with Superior Properties

Hussein

Wit

Kappert

et al. 2015

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…• C) where these carbides can form, which significantly reduces the corrosion resistance of the steel [66][67][68][69]. Reducing the amount of polymer used [67], or selecting a polymer which a suitable decomposition temperature might solve this problem [55,68].…”

Section: Metalsmentioning

confidence: 99%

“…Reducing the amount of polymer used [67], or selecting a polymer which a suitable decomposition temperature might solve this problem [55,68]. Nickel is considered to be a possible alternative for the more expensive palladium membranes for hydrogen separation.…”

Section: Metalsmentioning

confidence: 99%

“…Traditionally, inorganic porous hollow fibers have been used as membrane (supports), depending on the specific pore size of the fiber. A wide range of membrane applications is envisioned, such as for example water desalination [76], membrane distillation [82,83], pervaporation [83][84][85][86][87], water treatment [88,89], membrane extraction [90,91], organic solvent nanofiltration [10,84], microfiltration [19,60,63,67,[92][93][94], gas separation [27, 73-75, 80, 93, 95-97] or as a membrane bio reactor [17,98]. Additionally, fibers have been used as a catalyst support by deposition of a catalyst on the fiber's surface [12].…”

Section: Applicationsmentioning

confidence: 99%

“…The fabrication of silicon carbide hollow fibers is useful for extreme environments such as high temperature gas separation or liquid permeation where there is an increased risk of fouling [100,101]. Metallic fibers are produced sporadically and are limited to stainless steel/iron [66][67][68], nickel [6,70] and titanium [72]. Expanding this array with, for example, catalytically active metals, such as aluminium, copper, or zinc could open up new applications in the field of electro-catalysis or reactive separations.…”

Section: New Materialsmentioning

confidence: 99%

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