Polyolefin based antibacterial membranes derived from PE/PEO blends compatibilized with amine terminated graphene oxide and maleated PE

Mural, Prasanna Kumar S.; Banerjee, Aditi; Rana, Manish Singh; Shukla, Abhinaya; Padmanabhan, Babu; Bhadra, Sambhu; Madras, Giridhar; Bose, Suryasarathi

doi:10.1039/c4ta03997a

Cited by 107 publications

(72 citation statements)

References 40 publications

(57 reference statements)

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“…34 For instance, in a recent study on PE/PEO blends with GO-NH 2 the antibacterial efficiency of the membrane was attributed to the ROS (reacting oxygen species) and physical damage induced by the rough GO surface. 29 From SEM images, we can conclude that PVDF/PMMA membranes with Ag@TiO 2 -CNTs have good antifouling and antibacterial properties. For quantitative analysis, the standard plate count method was employed and the details are mentioned in the Experimental section.…”

Section: Antibacterial and Antifouling Properties Of The Membranesmentioning

confidence: 97%

Unique nanoporous antibacterial membranes derived through crystallization induced phase separation in PVDF/PMMA blends

2015

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In this study, a unique method was adopted to design porous membranes through crystallization induced phase separation in PVDF/PMMA (poly(vinylidene fluoride)/poly(methyl methacrylate)) blends. By etching out PMMA, which segregates either in the interlamellar and/or in the interspherulitic regions of the blends, nanoporous hierarchical structures can be derived. Different nanoparticles like titanium dioxide (TiO 2 ), silver nanoparticle (Ag) decorated carbon nanotubes (Ag-CNTs), TiO 2 decorated CNTs (TiO 2 -CNTs), Ag decorated TiO 2 (Ag-TiO 2 ) and Ag-TiO 2 decorated CNTs (Ag@TiO 2 -CNTs) were synthesized and melt mixed with 80/20 PVDF/PMMA blends to render antibacterial activity to the membranes.Scanning electron microscopy (SEM) was used to study the crystalline morphology of the membranes. A significant improvement in the trans-membrane flux was obtained in the blends with Ag@TiO 2 decorated CNTs as compared to the membranes derived from the neat blends, which can be attributed to the interconnected pores in these membranes. Both qualitative and quantitative studies of antifouling and antibacterial activity (using E. coli as a model bacterium) were performed using the standard plate count method. SEM micrographs clearly showed that the antifouling activity of the membranes was improved with addition of Ag@TiO 2 -CNTs. In the quantitative standard plate count method, the bacterial colony significantly decreased with the addition of Ag@TiO 2 -CNTs as against neat blends. This study opens a new avenue in the fabrication of polymer blend based membranes for water filtration.

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Section: Antibacterial and Antifouling Properties Of The Membranesmentioning

confidence: 97%

Unique nanoporous antibacterial membranes derived through crystallization induced phase separation in PVDF/PMMA blends

2015

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“…The synthesis and characterization of MDA−GO have already been reported in our earlier study. 38 Upon grafting of MDA onto GO sheets, the band around 1000−1150 cm −1 becomes broader indicating the nucleophilic substitution reaction at the epoxy groups. Furthermore, the presence of C−OH and C−N bonds is confirmed by the bands present in the range of 1000−1300 cm −1 , as shown in Figure 2.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Contrasting Effects of Graphene Oxide and Poly(ethylenimine) on the Polymorphism in Poly(vinylidene fluoride)

Sharma

Madras

Bose

2015

Crystal Growth & Design

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The nature of interaction between a heteronucleating agent (graphene oxide, GO) and a strongly polar macromolecule (poly(ethylenimine), PEI) with poly(vinylidene fluoride) (PVDF) influencing the crystalline structure and morphology has been systematically investigated in this work. PEI interacts with PVDF via ion-dipole interaction, which helps in lowering the free energy barrier for nucleation thereby promoting faster crystallization. In contrast, besides interacting with PVDF, GO also promotes heteronucleation in PVDF. We observed that both GO and PEI have very different effects on the overall crystalline morphology of PVDF. For instance, the neat PVDF showed a mixture of both α and β phases when cooled from the melt. However, incorporation of 0.1 wt % GO resulted in phase transformation from the stable α-phase to polar β-polymorph in PVDF. In contrast, PEI, which also resulted in faster crystallization in PVDF predominantly, resulted in the stable α-phase. Various techniques like Fourier transform infrared spectroscopy, X-ray diffraction, and differential scanning calorimetry were employed to confirm the phase transformations in PVDF. PEI was further grafted onto GO nanosheets to understand the combined effects of both GO and PEI on the polymorphism in PVDF. The PVDF/PEI−GO composite showed a mixture of phases, predominantly rich in α. These phenomenal effects were further analyzed and corroborated with the specific interaction between GO and PEI with PVDF using X-ray photon scattering (XPS) and NMR. In addition, the dielectric permittivity increased significantly in the presence of GO and PEI in the composites. For instance, PVDF/PEI−GO showed the highest permittivity of 39 at 100 Hz.

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“…Primary, Secondary, and Tertiary Amines: Many studies have been reported on the use of amine derivatives like chitosan, [100][101][102][103][104][105] polyethylenimine (PEI), [106][107][108][109] guanidine, [110][111][112][113] and dopamine [114][115][116][117] for antibacterial and antifouling applications. After protonation in the presence of water, these derivatives exhibit a net positive charge.…”

Section: Aminesmentioning

confidence: 99%

The Key Role of Modifications in Biointerfaces toward Rendering Antibacterial and Antifouling Properties in Polymeric Membranes for Water Remediation: A Critical Assessment

Samantaray

Madras

Bose

2019

Advanced Sustainable Systems

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Safe drinking water for all is a major challenge and needs critical attention, as freshwater aquifers are rapidly declining. A strategy based on addressing scarcity through membrane‐based purification and desalination can be an immediate and robust solution. The current scientific advances toward tailoring the structure and chemical properties of existing membrane materials have enabled key insights leading to new water purification alternatives. In the first part of the article, the key requirements for water decontamination addressed through state‐of‐the‐art literature on membranes are discussed. In the next part, the specific membrane modification strategies to impede bacterial growth and enhance fouling resistance are discussed, bringing in the underlying mechanisms. Finally, promising next‐generation separation techniques that are inspired by nature, inorganic and carbonaceous nanomaterial‐based membranes, layer‐by‐layer assembly, and dynamic composite membranes, are highlighted. This perspective article will help guide researchers working in this field from both industrial and academic standpoints, especially where the research is focused toward developing strategies to modify the existing solution besides finding alternative and sustainable new materials.

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Polyolefin based antibacterial membranes derived from PE/PEO blends compatibilized with amine terminated graphene oxide and maleated PE

Cited by 107 publications

References 40 publications

Unique nanoporous antibacterial membranes derived through crystallization induced phase separation in PVDF/PMMA blends

Unique nanoporous antibacterial membranes derived through crystallization induced phase separation in PVDF/PMMA blends

Contrasting Effects of Graphene Oxide and Poly(ethylenimine) on the Polymorphism in Poly(vinylidene fluoride)

The Key Role of Modifications in Biointerfaces toward Rendering Antibacterial and Antifouling Properties in Polymeric Membranes for Water Remediation: A Critical Assessment

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