The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Andrew Mills - One of the best experts on this subject based on the ideXlab platform.
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highly co2 sensitive Extruded fluorescent Plastic indicator film based on hpts
Analyst, 2016Co-Authors: Andrew Mills, Dilidaer YusufuAbstract:Highly-sensitive optical fluorescent Extruded Plastic films are reported for the detection of gaseous and dissolved CO2. The pH-sensitive fluorescent dye used is 8-hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS, PTS−) coated on the surface of hydrophilic fumed silica and the base is tetrabutylammonium hydroxide (TBAH). The above components are used to create an HPTS pigment (i.e. HPTS/SiO2/TBAH) with a high CO2 sensitivity (%CO2 (S = 1/2) = 0.16%) and fast 50% response (t50↓) = 2 s and recovery (t50↑) = 5 s times. Highly CO2-sensitive Plastic films are then fabricated, via the extrusion of the HPTS pigment powder in low-density polyethylene (LDPE). As with the HPTS-pigment, the luminescence intensity (at 515 nm) and absorbance (at 475 nm) of the HPTS Plastic film decreases as the %CO2 in the ambient gas phase increases. The HPTS Plastic film exhibits a high CO2 sensitivity, %CO2 (S = 1/2), of 0.29%, but a response time six month when stored in the dark but under otherwise ambient conditions). Moreover, the HPTS–LDPE film is stable in water, salt solution and even in acid (pH = 2), and in each of these media it can be used to detect dissolved CO2.
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antibacterial titania based photocatalytic Extruded Plastic films
Journal of Photochemistry and Photobiology A-chemistry, 2015Co-Authors: Marina Ratova, Andrew MillsAbstract:Abstract Photocatalytic antibacterial low density polyethylene (LDPE)–TiO 2 films are produced by an extrusion method and tested for photocatalytic oxidation activity, via the degradation of methylene blue (MB) and photocatalytic antibacterial activity, via the destruction of Escherichia coli . The MB test showed that Extruded LDPE films with a TiO 2 loading 30 wt.% were of optimum activity with no obvious decrease in film strength, although the activity was less than that exhibited by the commercial self-cleaning glass, Activ ® . UVC pre-treatment (9.4 mW cm −2 ) of the latter film improved its activity, with the level of surface sites available for MB adsorption increasing linearly with UVC dose. Although the MB test revealed an optimum exposure time of ca. 60 min photocatalytic oxidation activity, only 30 min was used in the photocatalytic antibacterial tests in order to combine minimal reduction in film integrity with maximum film photocatalytic activity. The photocatalytic antibacterial activity of the latter film was over 10 times that of a non-UVC treated 30 wt.% TiO 2 film, which, in turn was over 100 times more active than Activ ® .
M R Mackley - One of the best experts on this subject based on the ideXlab platform.
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a simple device for multiplex elisa made from melt Extruded Plastic microcapillary film
Lab on a Chip, 2011Co-Authors: Alexander D Edwards, Nuno M Reis, Nigel K H Slater, M R MackleyAbstract:We present a simple device for multiplex quantitative enzyme-linked immunosorbant assays (ELISA) made from a novel melt-Extruded microcapillary film (MCF) containing a parallel array of 200μm capillaries along its length. To make ELISA devices different protein antigens or antibodies were immobilised inside individual microcapillaries within long reels of MCF Extruded from fluorinated ethylene propylene (FEP). Short pieces of coated film were cut and interfaced with a pipette, allowing sequential uptake of samples and detection solutions into all capillaries from a reagent well. As well as being simple to produce, these FEP MCF devices have excellent light transmittance allowing direct optical interrogation of the capillaries for simple signal quantification. Proof of concept experiments demonstrate both quantitative and multiplex assays in FEP MCF devices using a standard direct ELISA procedure and read using a flatbed scanner. This new multiplex immunoassay platform should find applications ranging from lab detection to point-of-care and field diagnostics.
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the experimental observation and modelling of microdroplet formation within a Plastic microcapillary array
Chemical Engineering Science, 2009Co-Authors: Bart Hallmark, M R Mackley, Chirag Parmar, David Walker, Christian H Hornung, J F DavidsonAbstract:Abstract This paper reports an experimental study of the formation of a two-phase liquid mixture in a circular capillary tube of 0.74 mm diameter. Organic liquid, the continuous phase, flowed through the capillary. Aqueous liquid, the dispersed phase, was injected through a hypodermic entering the side of the capillary and a stream of aqueous droplets was formed in the flowing organic liquid. The observed droplet diameters depended strongly on the ratio of the flow-rates between the dispersed and continuous phases: droplet diameters ranged between 480 and 64 μm. A simple model gave good predictions, matching the data and showing how the droplet diameter is dependant on the flow rates of the two phases. The flow geometry was similar to the T-junction configuration used for emulsion formation in microfluidic devices and was fabricated from an Extruded Plastic capillary array termed a microcapillary film (MCF).
Bart Hallmark - One of the best experts on this subject based on the ideXlab platform.
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the experimental observation and modelling of microdroplet formation within a Plastic microcapillary array
Chemical Engineering Science, 2009Co-Authors: Bart Hallmark, M R Mackley, Chirag Parmar, David Walker, Christian H Hornung, J F DavidsonAbstract:Abstract This paper reports an experimental study of the formation of a two-phase liquid mixture in a circular capillary tube of 0.74 mm diameter. Organic liquid, the continuous phase, flowed through the capillary. Aqueous liquid, the dispersed phase, was injected through a hypodermic entering the side of the capillary and a stream of aqueous droplets was formed in the flowing organic liquid. The observed droplet diameters depended strongly on the ratio of the flow-rates between the dispersed and continuous phases: droplet diameters ranged between 480 and 64 μm. A simple model gave good predictions, matching the data and showing how the droplet diameter is dependant on the flow rates of the two phases. The flow geometry was similar to the T-junction configuration used for emulsion formation in microfluidic devices and was fabricated from an Extruded Plastic capillary array termed a microcapillary film (MCF).
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The development of voidage and capillary size within Extruded Plastic films
Journal of Materials Science, 2008Co-Authors: D.i. Medina, T. D. Lord, Bart Hallmark, Malcolm R. MackleyAbstract:This paper describes how both capillary diameter and voidage can be manipulated by downstream mechanical processing of Plastic microcapillary films (MCFs). MCFs are a novel thermoPlastic extrudate that have been manufactured by the entrainment of gas within nozzles positioned in an extrusion die; the film resembles a Plastic tape but contains an array of equally spaced parallel microcapillaries that run along its entire length. The low-voidage MCFs manufactured from linear low density polyethylene were made by melt drawing the polymer to produce an essentially isotropic MCF. This MCF could then be subsequently mechanically drawn to form small diameter MCFs. By altering process conditions an anisotropic high voidage MCF was produced. This MCF was brittle when drawn in the capillary direction but showed unusual mechanical transverse drawing. The paper presents experiment details for the manufacture of the different MCF structures together with mechanical properties and X-ray orientation data. From this, qualitative explanations for the mechanisms to achieve the different structures are given.
John J. Engblom - One of the best experts on this subject based on the ideXlab platform.
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Computational and Experimental Characterization of Continuously Fiber Reinforced Plastic Extrusions: Part I – Short-term Flexural Loading
2016Co-Authors: Zhiyin Zheng, John J. EngblomAbstract:ABSTRACT: Experimental characterization of time-independent properties for rectangular hollow-cored continuous fiber reinforced commingled recycled Plastic Extruded forms under short-term flexural loading has been presented in this paper. Finite element based computer models have been developed to predict the effects of damage progression in such reinforced Extruded Plastic forms. Experimental results demonstrate that fiber micro-buckling and fiber–matrix interface failures occur during the static flexural loading environment. Experimental data also indicates that these damage modes significantly reduce the short-term flexural properties and should be avoided or minimized through optimizing the location of continuous reinforcement and using a coupling agent in enhancing interfacial bonding between reinforcement and matrix. ‘‘Damage dependent’ ’ finite element models were developed using different material property types to represent the glass-fiber roving, fiber–matrix interface and Plastic matrix respectively. Material nonlinearity of the Plastic matrix has been incorporated along with stress-based failure criteria to account for fiber–matrix interfacial shear failure and local fiber micro-buckling. A user-defined subroutine, part of an industry standard finite element software package, has been modified to accommodate the damage progression. The developed finite element based model(s) have correlated well with the short-ter
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Computational and Experimental Characterization of Continuously Fiber Reinforced Plastic Extrusions: Part II – Long-term Flexural Loading
2016Co-Authors: Zhiyin Zheng, John J. EngblomAbstract:ABSTRACT: Experimental characterization of time-dependent properties for rectangular hollow-cored, continuous fiber reinforced, commingled recycled Plastic Extruded forms under long-term (creep) flexural loading has been presented in this paper. Finite element based computer models have been developed to predict the effects of damage progression in such reinforced Extruded Plastic forms. In the long-term (creep) tests, reinforced and unreinforced extrusions with varying compositions were used as specimens. These Extruded specimens were submerged in heated water and subjected to different loads. Experimental results indicate that fiber micro-buckling and fiber–matrix interface failure occur during the creep loading environment. The fiber micro-buckling occurs over time, compared with similar but dramatic damage that occurs in a short-period of time during short-term (static) loading, as discussed in Part I of this work. Experimental data also shows that these damage modes significantly reduce the long-term (life cycle) flexural properties, and the specimens with a coupling agent demonstrated much better performance. ‘‘Damage dependent’ ’ finite element models were developed using different material property types to represent the glass-fiber roving, fiber–matrix interface and Plastic matrix respectively. Material nonlinearity of the Plastic matrix has been incorporated along with stress-based failure criteria to account fo
Pe Smolka - One of the best experts on this subject based on the ideXlab platform.
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Stability of aqueous polymeric dispersions for ultra-thin coating of bi-axially oriented polyethylene terephthalate films
'MDPI AG', 2018Co-Authors: Pe Smolka, Musilová Lenka, Mráček Aleš, Sedláček TomášAbstract:The stability of polyacrylate and polyester based aqueous dispersions designed for ultrathin coating of Extruded Plastic films, especially bi-axially oriented polyethylene terephthalate (BOPET), was studied. Also, the effect of the gemini surfactant based defoaming/wetting agent on the properties of the dispersions was examined. The addition of the defoaming/wetting agent resulted in reducing the surface free tension of the polyacrylate and polyester dispersion by 15% and 20%, respectively and the initial foam height by 60% and 15%, respectively. At the same time, the agent addition did not compromise the temperature and pH stability of the dispersions. Such modified dispersion can be utilized for ultrathin coating of Plastic film used for packaging, to improve their processability, printability, and metallization.European Regional Development Fund (ERDF); national budget of the Czech Republic [CZ.1.05/2.1.00/03.0111]; Ministry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504]; European Regional Development Fund [CZ.1.05/2.1.00/19.0409
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Stability of Aqueous Polymeric Dispersions for Ultra-Thin Coating of Bi-Axially Oriented Polyethylene Terephthalate Films
MDPI AG, 2017Co-Authors: Pe Smolka, Lenka Musilová, Aleš Mráček, Tomáš SedláčekAbstract:The stability of polyacrylate and polyester based aqueous dispersions designed for ultrathin coating of Extruded Plastic films, especially bi-axially oriented polyethylene terephthalate (BOPET), was studied. Also, the effect of the gemini surfactant based defoaming/wetting agent on the properties of the dispersions was examined. The addition of the defoaming/wetting agent resulted in reducing the surface free tension of the polyacrylate and polyester dispersion by 15% and 20%, respectively and the initial foam height by 60% and 15%, respectively. At the same time, the agent addition did not compromise the temperature and pH stability of the dispersions. Such modified dispersion can be utilized for ultrathin coating of Plastic film used for packaging, to improve their processability, printability, and metallization
