The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform

Kuma P - One of the best experts on this subject based on the ideXlab platform.

  • Insight into the Design and Fabrication of a Leaf-Mimicking Micropump
    AMER PHYSICAL SOC, 2019
    Co-Authors: Agrawal P, Ps Gandhi, Majumde M, Kuma P
    Abstract:

    A micropump is the heart of any microfluidic device that finds applications in several lab-on-chip devices. Passive micropumps are highly desirable for this purpose due to their ease of integration, low energy requirements, and simplistic design and operation. The design of a plant leaf serves as natural inspiration for the development of an evaporation-assisted passive micropump. The presence of a branching-channel-like venation pattern ensures water distribution to the spongy mesophyll cells, increasing the surface area for evaporation. However, because of its multiscale design and the complexity of the venation pattern, emulating a leaf's design is challenging. Apart from the lack of understanding of design parameters that affect fluid flow, manufacturing limitations impede the development of such bioinspired micropumps. Inspired by the multiscale design of the leaf, in this work we propose a passive micropump mimicking the structure of a leaf. Using evaporation and capillary pressure as the pumping mechanism, our leaf-mimicking micropump consists of a Microporous Membrane integrated with a branched, fractal channel network resembling a leaf's venation pattern. Our proposed fabrication method is simple, scalable, and inexpensive and uses readily available materials. We demonstrate a significant increase in the fluid flow rate due to the addition of this branched-channel network. We support our experimental observations using an analytical model, wherein we discuss the design parameters that affect the pumping rate. Correspondingly, the performance of these micropumps can be optimized on the basis of intrinsic and extrinsic factors as per the desired applications

Kuma Prasoo - One of the best experts on this subject based on the ideXlab platform.

  • Insight into the design and fabrication of a leaf-mimicking micropump
    'American Physical Society (APS)', 2019
    Co-Authors: Agrawal Prasha, Gandhi, Prasanna S., Majumde Mainak, Kuma Prasoo
    Abstract:

    A micropump is the heart of any microfluidic device that finds applications in several lab-on-chip devices. Passive micropumps are highly desirable for this purpose due to their ease of integration, low energy requirements and simplistic design and operation. The design of a plant leaf serves as a natural inspiration for developing an evaporation assisted passive micropump. The presence of branching channel like venation pattern ensures water distribution to the spongy mesophyll cells increasing the surface area for evaporation. However, due to its multiscale design and complexity of the venation pattern, emulating a leaf's design is challenging. Apart from the lack of understanding of design parameters that affect fluid flow, manufacturing limitations impede the development of such bio-inspired micropumps. Inspired by the multi-scale design of the leaf, in this work we propose a passive micropump mimicking the structure of a leaf. Employing evaporation and capillary pressure as the pumping mechanism, our leaf mimicking micropump consists of a Microporous Membrane integrated with a branched, fractal channel network resembling a leaf's venation pattern. Our proposed fabrication methodology is simple, scalable, inexpensive and uses readily available materials. We demonstrate a significant increase in the fluid flow rate due to the addition of this branched channel network. We support our experimental observations using an analytical model, wherein we discuss the design parameters that affect the pumping rate. Correspondingly, the performance of these micropumps can be optimized based on intrinsic and extrinsic factors as per the desired applications

Senentxu Lanceros-méndez - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic Microporous Membrane against the Increasing Problem of Water Emerging Pollutants
    MDPI AG, 2019
    Co-Authors: Pedro M. Martins, Joana M. Ribeiro, Sara Teixeira, Dmitri. Y. Petrovykh, Gianaurelio Cuniberti, Luciana Pereira, Senentxu Lanceros-méndez
    Abstract:

    Emerging pollutants are an essential class of recalcitrant contaminants that are not eliminated from water after conventional treatment. Here, a photocatalytic Microporous Membrane based on polyvinylidene difluoride-co-trifluoroethylene (PVDF−TrFE) with immobilised TiO2 nanoparticles, prepared by solvent casting, was tested against representative emerging pollutants. The structure and composition of these polymeric Membranes were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, porosimetry, and contact angle goniometry. The nanocomposites exhibited a porous structure with a uniform distribution of TiO2 nanoparticles. The addition of TiO2 did not change the structure of the polymeric matrix; however, it increased the wettability of the nanocomposite. The nanocomposites degraded 99% of methylene blue (MB), 95% of ciprofloxacin (CIP), and 48% of ibuprofen (IBP). The Microporous nanocomposite exhibited no photocatalytic efficiency loss after four use cycles, corresponding to 20 h of UV irradiation. The reusability of this system confirms the promising nature of polymer nanocomposites as the basis for cost-effective and scalable treatments of emerging pollutants

Lanceros-méndez S. - One of the best experts on this subject based on the ideXlab platform.

  • Photocatalytic Microporous Membrane against the increasing problem of water emerging pollutants
    MDPI, 2019
    Co-Authors: Martins, Pedro M., Ribeiro, Joana Margarida Fernandes Silva, Teixeira Sara, Petrovykh, Dmitri. Y., Cuniberti Gianaurelio, Pereira Luciana, Lanceros-méndez S.
    Abstract:

    Emerging pollutants are an essential class of recalcitrant contaminants that are not eliminated from water after conventional treatment. Here, a photocatalytic Microporous Membrane based on polyvinylidene difluoride-co-trifluoroethylene (PVDF−TrFE) with immobilised TiO2 nanoparticles, prepared by solvent casting, was tested against representative emerging pollutants. The structure and composition of these polymeric Membranes were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, porosimetry, and contact angle goniometry. The nanocomposites exhibited a porous structure with a uniform distribution of TiO2 nanoparticles. The addition of TiO2 did not change the structure of the polymeric matrix; however, it increased the wettability of the nanocomposite. The nanocomposites degraded 99% of methylene blue (MB), 95% of ciprofloxacin (CIP), and 48% of ibuprofen (IBP). The Microporous nanocomposite exhibited no photocatalytic efficiency loss after four use cycles, corresponding to 20 h of UV irradiation. The reusability of this system confirms the promising nature of polymer nanocomposites as the basis for cost-effective and scalable treatments of emerging pollutants.P.M. Martins thanks the FCT for the grant SFRH/BD/98616/2013. The authors acknowledge funding from the Basque Government Industry Department under the ELKARTEK Program and the Spanish Ministry of Economy and Competitiveness (MINECO) through the project MAT2016-76039-C4-3-R (AEI/FEDER, UE) (including the FEDER financial support). This work was also supported by the Graduate Academy of the Technische Universität Dresden.M.; visualization, J.M.R.; supervision, G.C., S.L.-M. Funding: This work was supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the strategic project UID/FIS/04650/2013 by FEDER funds through the COMPETE 2020–Programa Operacional Competitividade e Internacionalização (POCI) with the reference project POCI-01-0145-FEDER-006941, and project PTDC/CTM-ENE/5387/2014. FCT also supported this project under the scope of UID/BIO/04469/2019 unit and BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund under the scope of Norte2020—Programa Operacional Regional do Norte.info:eu-repo/semantics/publishedVersio

Pilosof David - One of the best experts on this subject based on the ideXlab platform.

  • Analytical Chemiluminescence in Microporous Membrane Flow Cells
    1
    Co-Authors: Pilosof David
    Abstract:

    175 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982.Microporous Membrane chemiluminescence (CL) flow cells are presented as an advantageous method for chemical reagent and analyte mixing in continuous flow. The method adds simplicity, significant reagent economy and minimal sample contamination to the conventional advantages of analytical CL determinations.The most significant application of the proposed method is in coupling enzymatic reactions that generate hydrogen peroxide to CL detection, in the same flow cell, in spite of the very different pH optima required by both processes. The analysis of glucose, using this approach, is studied in depth, and results obtained are compared to values determined by a routine assay method with good correlation. Other applications include analysis by use of other oxidase enzymes, determination of mixtures and determination of sugars that can be enzymatically converted to D-glucose.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD