Nanoscale Pillar-Enhanced Tribological Surfaces as Antifouling Membranes

Choi, Wansuk; Chan, Edwin P.; Park, Jong Hyun; Ahn, Won Gi; Jung, Hyun Wook; Hong, Seungkwan; Lee, Jong Suk; Han, Junghee; Park, Sangpil; Ko, Doo Hyun; Lee, Jung Hyun

doi:10.1021/acsami.6b10875

Cited by 58 publications

(32 citation statements)

References 49 publications

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“…The bacterial adhesion force on these nanoengineered surfaces was reduced as measured by atomic force microscopy. Similar antifouling effects were observed on hydrophilic TiO 2 nanopillars or nanotubes . The nanofeature dimensions, e.g., nanopillar diameter, height, and spacing affected the bacterial adhesion due to the change of effective contact area .…”

Section: Antimicrobial Nanotopographiessupporting

confidence: 59%

Multifunctional Coatings and Nanotopographies: Toward Cell Instructive and Antibacterial Implants

Mas‐Moruno

Dalby

2018

Adv Healthcare Materials

188

171

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In biomaterials science, it is nowadays well accepted that improving the biointegration of dental and orthopedic implants with surrounding tissues is a major goal. However, implant surfaces that support osteointegration may also favor colonization of bacterial cells. Infection of biomaterials and subsequent biofilm formation can have devastating effects and reduce patient quality of life, representing an emerging concern in healthcare. Conversely, efforts toward inhibiting bacterial colonization may impair biomaterial–tissue integration. Therefore, to improve the long‐term success of medical implants, biomaterial surfaces should ideally discourage the attachment of bacteria without affecting eukaryotic cell functions. However, most current strategies seldom investigate a combined goal. This work reviews recent strategies of surface modification to simultaneously address implant biointegration while mitigating bacterial infections. To this end, two emerging solutions are considered, multifunctional chemical coatings and nanotopographical features.

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Section: Antimicrobial Nanotopographiessupporting

confidence: 59%

Multifunctional Coatings and Nanotopographies: Toward Cell Instructive and Antibacterial Implants

Mas‐Moruno

Dalby

2018

Adv Healthcare Materials

188

171

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“…Apart from inducing turbulence flow of the feed, surface patterning also increases the effective surface area for improved permeability [17,41]. The 3D pattern induces turbulence flow by promoting local mixing and hence inhibits accumulation of foulant on the membrane surface [26,66,81,82,88].…”

Section: Importance Of Surface Patterning For Various Membrane Promentioning

confidence: 99%

“…Such views lead to innovative works in developing novel membrane materials having a patterned surface. However, more comprehensive applications of modifying the surface chemistry have been limited by uncertainty concerning cost, reliability, and environmental sustainability [24,25,26,27,28,29,30].…”

Section: Introductionmentioning

confidence: 99%

Membrane Surface Patterning as a Fouling Mitigation Strategy in Liquid Filtration: A Review

et al. 2019

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Membrane fouling is seen as the main culprit that hinders the widespread of membrane application in liquid-based filtration. Therefore, fouling management is key for the successful implementation of membrane processes, and it is done across all magnitudes. For optimum operation, membrane developments and surface modifications have largely been reported, including membrane surface patterning. Membrane surface patterning involves structural modification of the membrane surface to induce secondary flow due to eddies, which mitigate foulant agglomeration and increase the effective surface area for improved permeance and antifouling properties. This paper reviews surface patterning approaches used for fouling mitigation in water and wastewater treatments. The focus is given on the pattern formation methods and their effect on overall process performances.

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“…The FNS and FS membranes showed a loss in permeance i.e., 62% and 72% respectively, whereas the patterned membrane only showed a 52% permeance decrease after 80 min of filtration. For the patterned membranes, the combined effect of a larger effective surface area and presence of surface patterns led to particle deposition in the valley regions, but still leaving the top regions for un-restricted filtration [39]. It should also be noted that the patterned membrane showed a much higher final permeance as compared to flat membranes after 80 min of filtration time: the permeance for the patterned membrane was 12 times higher (22 ± 3 L/m 2 h bar) than for the FNS membrane (1.7 ± 0.2 L/m 2 h bar).…”

Section: Membrane Performancementioning

confidence: 99%

Synthesis of patterned PVDF ultrafiltration membranes: Spray-modified non-solvent induced phase separation

Ilyas

Mertens

Oyaert

et al. 2020

Journal of Membrane Science

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Patterned membranes have been attractive for the mitigation of fouling in membrane processes, but existing patterning methods are rather in-effective in terms of scalability and performance due to pore-size reduction and patterning at the non-selective membrane side. Polyvinylidene fluoride (PVDF) was used now to synthesize patterned membranes via the spray-modified non-solvent induced phase separation (s-NIPS), a recently developed technique that avoids the current drawbacks of patterned membranes. However, PVDF intrinsically suffers from a slow phase separation, while very fast fixation of the patterns is crucial with this synthesis method. Therefore, the casting solution was optimized towards an accelerated process of phase inversion by systematically studying the effect of polymer concentration, addition of poly(vinylpyrrolidone) (PVP), addition of non-solvent (H2O) and use of different casting solvents for adequate patterning of the membranes. SEM analysis and pure water permeance of the synthesized membranes assessed the homogeneity and pattern formation for each membrane. The most optimal casting solution composition comprised of 20 wt% PVDF, 6.7 wt% PVP and 1 wt% H2O which resulted in homogenously patterned PVDF membranes. The optimized patterned membrane showed a 9 fold increase in PWP as compared to the reference flat membrane thanks to the addition of PVP and H2O as well as the additional surface area. In the filtration of proteins, the water permeance of the membranes improved drastically (+140%) upon patterning with only a moderate loss of BSA rejection (from 90% to 71%) as compared to the corresponding flat membrane. Realisation of patterning via the s-NIPS method resulted in a higher effective membrane surface area combined with an increased membrane porosity. Reduced flux decline of the patterned membrane (52%) as compared to the flat membrane (62%) during continuous BSA filtration also proved the antifouling potential of the created patterns.

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Nanoscale Pillar-Enhanced Tribological Surfaces as Antifouling Membranes

Cited by 58 publications

References 49 publications

Multifunctional Coatings and Nanotopographies: Toward Cell Instructive and Antibacterial Implants

Multifunctional Coatings and Nanotopographies: Toward Cell Instructive and Antibacterial Implants

Membrane Surface Patterning as a Fouling Mitigation Strategy in Liquid Filtration: A Review

Synthesis of patterned PVDF ultrafiltration membranes: Spray-modified non-solvent induced phase separation

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