The Experts below are selected from a list of 362298 Experts worldwide ranked by ideXlab platform

Neil R Cameron - One of the best experts on this subject based on the ideXlab platform.

  • emulsion templated porous polymers prepared by thiol ene and thiol yne photopolymerisation using multifunctional acrylate and non acrylate monomers
    Polymer, 2017
    Co-Authors: Chaoyi Chen, Ahmed M Eissa, Neil R Cameron, Tara L Schiller
    Abstract:

    The chemical and mechanical properties of macroporous polymer substrates play a crucial role in the determination of their End-Application. The preparation of highly (macro)porous monolithic polymers (polyHIPEs) by emulsion templating and thiol-ene/yne photopolymerisation, using multifunctional acrylate, allyl ether and alkyne-based monomers with trimethylolpropane tris (3-mercaptopropionate) (TMPTMP), is described in this work. Issues associated with monomer solubility and/or stability of the produced high internal phase emulsions (HIPEs) are tackled. Scanning electron microscopy (SEM) is used to study the morphology and porosity (average void diameters) of the obtained materials. Due to the nature of the photoinitiated thiol-ene reactions, materials obtained from acrylate monomers display residual thiols that are quantified by a colourimetric (Ellman's) assay. Raman spectroscopy is also shown to be a complementary technique to evaluate the residual thiol content. The influence of the monomer functionality on the mechanical properties of the material is explored using compression tests. Significant differences in the surface functionality and mechanical behavior between materials prepared with comonomers able to homopolymerise (acrylates) and those unable to homopolymerise (allyl ethers; alkynes) are demonstrated.

Ahmed M Eissa - One of the best experts on this subject based on the ideXlab platform.

  • emulsion templated porous polymers prepared by thiol ene and thiol yne photopolymerisation using multifunctional acrylate and non acrylate monomers
    Polymer, 2017
    Co-Authors: Chaoyi Chen, Ahmed M Eissa, Neil R Cameron, Tara L Schiller
    Abstract:

    The chemical and mechanical properties of macroporous polymer substrates play a crucial role in the determination of their End-Application. The preparation of highly (macro)porous monolithic polymers (polyHIPEs) by emulsion templating and thiol-ene/yne photopolymerisation, using multifunctional acrylate, allyl ether and alkyne-based monomers with trimethylolpropane tris (3-mercaptopropionate) (TMPTMP), is described in this work. Issues associated with monomer solubility and/or stability of the produced high internal phase emulsions (HIPEs) are tackled. Scanning electron microscopy (SEM) is used to study the morphology and porosity (average void diameters) of the obtained materials. Due to the nature of the photoinitiated thiol-ene reactions, materials obtained from acrylate monomers display residual thiols that are quantified by a colourimetric (Ellman's) assay. Raman spectroscopy is also shown to be a complementary technique to evaluate the residual thiol content. The influence of the monomer functionality on the mechanical properties of the material is explored using compression tests. Significant differences in the surface functionality and mechanical behavior between materials prepared with comonomers able to homopolymerise (acrylates) and those unable to homopolymerise (allyl ethers; alkynes) are demonstrated.

Chaoyi Chen - One of the best experts on this subject based on the ideXlab platform.

  • emulsion templated porous polymers prepared by thiol ene and thiol yne photopolymerisation using multifunctional acrylate and non acrylate monomers
    Polymer, 2017
    Co-Authors: Chaoyi Chen, Ahmed M Eissa, Neil R Cameron, Tara L Schiller
    Abstract:

    The chemical and mechanical properties of macroporous polymer substrates play a crucial role in the determination of their End-Application. The preparation of highly (macro)porous monolithic polymers (polyHIPEs) by emulsion templating and thiol-ene/yne photopolymerisation, using multifunctional acrylate, allyl ether and alkyne-based monomers with trimethylolpropane tris (3-mercaptopropionate) (TMPTMP), is described in this work. Issues associated with monomer solubility and/or stability of the produced high internal phase emulsions (HIPEs) are tackled. Scanning electron microscopy (SEM) is used to study the morphology and porosity (average void diameters) of the obtained materials. Due to the nature of the photoinitiated thiol-ene reactions, materials obtained from acrylate monomers display residual thiols that are quantified by a colourimetric (Ellman's) assay. Raman spectroscopy is also shown to be a complementary technique to evaluate the residual thiol content. The influence of the monomer functionality on the mechanical properties of the material is explored using compression tests. Significant differences in the surface functionality and mechanical behavior between materials prepared with comonomers able to homopolymerise (acrylates) and those unable to homopolymerise (allyl ethers; alkynes) are demonstrated.

Tara L Schiller - One of the best experts on this subject based on the ideXlab platform.

  • emulsion templated porous polymers prepared by thiol ene and thiol yne photopolymerisation using multifunctional acrylate and non acrylate monomers
    Polymer, 2017
    Co-Authors: Chaoyi Chen, Ahmed M Eissa, Neil R Cameron, Tara L Schiller
    Abstract:

    The chemical and mechanical properties of macroporous polymer substrates play a crucial role in the determination of their End-Application. The preparation of highly (macro)porous monolithic polymers (polyHIPEs) by emulsion templating and thiol-ene/yne photopolymerisation, using multifunctional acrylate, allyl ether and alkyne-based monomers with trimethylolpropane tris (3-mercaptopropionate) (TMPTMP), is described in this work. Issues associated with monomer solubility and/or stability of the produced high internal phase emulsions (HIPEs) are tackled. Scanning electron microscopy (SEM) is used to study the morphology and porosity (average void diameters) of the obtained materials. Due to the nature of the photoinitiated thiol-ene reactions, materials obtained from acrylate monomers display residual thiols that are quantified by a colourimetric (Ellman's) assay. Raman spectroscopy is also shown to be a complementary technique to evaluate the residual thiol content. The influence of the monomer functionality on the mechanical properties of the material is explored using compression tests. Significant differences in the surface functionality and mechanical behavior between materials prepared with comonomers able to homopolymerise (acrylates) and those unable to homopolymerise (allyl ethers; alkynes) are demonstrated.

Manish Parashar - One of the best experts on this subject based on the ideXlab platform.

  • Scheduling and flexible control of bandwidth and in-transit services for End-to-End Application workflows
    Future Generation Computer Systems, 2016
    Co-Authors: Mehmet Fatih Aktas, Georgiana Haldeman, Manish Parashar
    Abstract:

    End-to-End scientific Application workflows that integrate high-End experiments and instruments with large scale simulations and End-user displays are becoming increasingly important. These workflows require complex couplings and data sharing between distributed components involving large data volumes and present varying hard (in-time data delivery) and soft (in-transit processing) quality of service (QoS) requirements. As a result, supporting efficient data transport is critical for such workflows. In this paper, we leverage software-defined networking (SDN) to address issues of data transport service control and resource provisioning to meet varying QoS requirements from multiple coupled workflows sharing the same service medium. Specifically, we present a flexible control and a disciplined resource scheduling approach for data transport services for science networks. Furthermore, we emulate an SDN testbed on top of the FutureGrid virtualized testbed and use it to evaluate our approach for a realistic scientific workflow. Our results show that SDN-based control and resource scheduling based on simple intuitive models can meet the requirements of the targeted workflows with high resource utilization. A flow-based in-transit data staging and processing approach.An opportunistic QoS model, based on convex optimization, for resource scheduling.SDN controller for enabling in-transit services and End-to-End workflow couplings.An evaluation using a Fusion workflow scenario and an emulated virtualized SDN testbed.The approach achieves high resource utilization and satisfies workflow QoS requirements.

  • CometCloud: Enabling Software-Defined Federations for End-to-End Application Workflows
    IEEE Internet Computing, 2015
    Co-Authors: Javier Diaz-montes, Moustafa Abdelbaky, Mengsong Zou, Manish Parashar
    Abstract:

    Emerging Applications, from big science to the Internet of Things, increasingly involve dynamic and data-driven End-to-End workflows with large and often heterogeneous requirements. These Applications require platforms that dynamically and flexibly combine resources across systems and data centers--for example, to aggregate capacity or capabilities, or integrate data stores when moving data is no longer an option. The CometCloud project at the Rutgers Discovery Informatics Institute (RDI2) aims to provide infrastructure and programming support for enabling such End-to-End Application workflows. CometCloud enables flexible software-defined synthesis of custom cyberinfrastructure through the autonomic, on-demand federation of geographically distributed compute and data resources. CometCloud exposes the federated cyberinfrastructure using elastic cloud abstractions and science-as-a-service platforms. The authors introduce CometCloud, use sample Application use cases to illustrate its operation, and present current and future research directions toward supporting pervasive Application workflows enabled by the Internet of Things.