The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
Jamshed Ali - One of the best experts on this subject based on the ideXlab platform.
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inorganic arsenic speciation in water samples by miniaturized solid phase microextraction using a new polystyrene polydimethyl Siloxane Polymer in micropipette tip of syringe system
Talanta, 2016Co-Authors: Jamshed Ali, Mustafa Tuzen, Tasneem Gul Kazi, Baki HazerAbstract:The Polymer, polystyrene polydimethyl Siloxane was loaded into the micropipette tip of the syringe system as an adsorbent to developed miniaturized solid phase microextraction. Standard solutions of arsenate and arsenite were passed through the adsorbent loaded in micropipette tip to check the adsorption behaviors. It was observed that arsenate adsorbed on the polystyrene polydimethyl Siloxane in the pH rang of 6-8, while arsenite was directly passed through the micropipette tip of syringe system. The adsorbed arsenate in micropipette tip of syringe system were eluted by 1.0M hydrochloric acid. The total inorganic arsenic contents were obtained by the addition of oxidizing agent potassium permanganate into the studied samples before passing to the micropipette tip of syringe system. Arsenite concentration in water samples were measured by subtracting arsenate from total inorganic arsenic concentration. Different characteristics which effect the determination of arsenate specie like amount of adsorbent, adsorption capacity, pH, pulled and pushed cycles for adsorption and desorption, volume of sample, eluent type and it volume were also studied in detail. Enrichment factor and detection limit of arsenate by desired method were 218 and 6.9ngL-1 respectively. The relative standard deviation was 4.1% (n=10, C=0.12µgL-1). Accuracy of the desired technique was confirmed by analysis of the CRMs (Lake Ontario Water TM-28.3 and Riverine Water NRCC-SLRS-4). Desired technique was significantly useful for determination of the total arsenic, arsenate, and arsenite contents in different natural water samples.
Baki Hazer - One of the best experts on this subject based on the ideXlab platform.
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inorganic arsenic speciation in water samples by miniaturized solid phase microextraction using a new polystyrene polydimethyl Siloxane Polymer in micropipette tip of syringe system
Talanta, 2016Co-Authors: Jamshed Ali, Mustafa Tuzen, Tasneem Gul Kazi, Baki HazerAbstract:The Polymer, polystyrene polydimethyl Siloxane was loaded into the micropipette tip of the syringe system as an adsorbent to developed miniaturized solid phase microextraction. Standard solutions of arsenate and arsenite were passed through the adsorbent loaded in micropipette tip to check the adsorption behaviors. It was observed that arsenate adsorbed on the polystyrene polydimethyl Siloxane in the pH rang of 6-8, while arsenite was directly passed through the micropipette tip of syringe system. The adsorbed arsenate in micropipette tip of syringe system were eluted by 1.0M hydrochloric acid. The total inorganic arsenic contents were obtained by the addition of oxidizing agent potassium permanganate into the studied samples before passing to the micropipette tip of syringe system. Arsenite concentration in water samples were measured by subtracting arsenate from total inorganic arsenic concentration. Different characteristics which effect the determination of arsenate specie like amount of adsorbent, adsorption capacity, pH, pulled and pushed cycles for adsorption and desorption, volume of sample, eluent type and it volume were also studied in detail. Enrichment factor and detection limit of arsenate by desired method were 218 and 6.9ngL-1 respectively. The relative standard deviation was 4.1% (n=10, C=0.12µgL-1). Accuracy of the desired technique was confirmed by analysis of the CRMs (Lake Ontario Water TM-28.3 and Riverine Water NRCC-SLRS-4). Desired technique was significantly useful for determination of the total arsenic, arsenate, and arsenite contents in different natural water samples.
K T Faber - One of the best experts on this subject based on the ideXlab platform.
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analysis of multi scale mechanical properties of ceramic trusses prepared from preceramic Polymers revision prepared for additive manufacturing
Additive manufacturing, 2020Co-Authors: Neal R. Brodnik, Johanna Schmidt, Paolo Colombo, K T FaberAbstract:Abstract To better understand the impact of complex structure on mechanical properties in additively manufactured ceramics, truss structures were 3D printed in preceramic Polymer and mechanically evaluated in the pyrolyzed SiOC state. Specimens were printed using digital light processing with a Siloxane Polymer resin blend. Four different designs were printed: two bending-dominant Kelvin cell structures, a stretching-dominant octet structure, and a mixture of the two with geometries chosen for equivalent stiffness. Mechanical characterization was done at multiple length scales: uniaxial compression to evaluate the entire truss structure, and three-point flexure to assess individual beam elements. After pyrolysis, it was found that truss designs exhibited different shrinkages at the beam element scale despite being composed of the same preceramic Polymer and exhibiting isotropic shrinkage at the macro-truss scale. This manner of nonuniform shrinkage has rarely, if ever been reported, as it is standard practice in additive manufacturing to report only bulk linear shrinkage. In uniaxial compression, Kelvin structures with thicker beams exhibited the highest strength of 10 MPa, and octet structures exhibited the lowest strength of 3.8 MPa. In beam element flexure however, the octet beams had the highest strength, 1.9 GPa, four times stronger than the Kelvin beam elements and 500 times stronger than the octet bulk structure. Lastly, the implications for interchangeable truss structures are discussed.
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Analysis of Multi-scale Mechanical Properties of Ceramic Trusses Prepared from Preceramic Polymers
Additive manufacturing, 2019Co-Authors: Neal R. Brodnik, Johanna Schmidt, Paolo Colombo, K T FaberAbstract:Abstract To better understand the impact of complex structure on mechanical properties in additively manufactured ceramics, truss structures were 3D printed in preceramic Polymer and mechanically evaluated in the pyrolyzed SiOC state. Specimens were printed using digital light processing with a Siloxane Polymer resin blend. Four different designs were printed: two bending-dominant Kelvin cell structures, a stretching-dominant octet structure, and a mixture of the two with geometries chosen for equivalent stiffness. Mechanical characterization was done at multiple length scales: uniaxial compression to evaluate the entire truss structure, and three-point flexure to assess individual beam elements. After pyrolysis, it was found that truss designs exhibited different shrinkages at the beam element scale despite being composed of the same preceramic Polymer and exhibiting isotropic shrinkage at the macro-truss scale. This manner of nonuniform shrinkage has rarely, if ever been reported, as it is standard practice in additive manufacturing to report only bulk linear shrinkage. In uniaxial compression, Kelvin structures with thicker beams exhibited the highest strength of 10 MPa, and octet structures exhibited the lowest strength of 3.8 MPa. In beam element flexure however, the octet beams had the highest strength, 1.9 GPa, four times stronger than the Kelvin beam elements and 500 times stronger than the octet bulk structure. Lastly, the implications for interchangeable truss structures are discussed.
Neal R. Brodnik - One of the best experts on this subject based on the ideXlab platform.
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analysis of multi scale mechanical properties of ceramic trusses prepared from preceramic Polymers revision prepared for additive manufacturing
Additive manufacturing, 2020Co-Authors: Neal R. Brodnik, Johanna Schmidt, Paolo Colombo, K T FaberAbstract:Abstract To better understand the impact of complex structure on mechanical properties in additively manufactured ceramics, truss structures were 3D printed in preceramic Polymer and mechanically evaluated in the pyrolyzed SiOC state. Specimens were printed using digital light processing with a Siloxane Polymer resin blend. Four different designs were printed: two bending-dominant Kelvin cell structures, a stretching-dominant octet structure, and a mixture of the two with geometries chosen for equivalent stiffness. Mechanical characterization was done at multiple length scales: uniaxial compression to evaluate the entire truss structure, and three-point flexure to assess individual beam elements. After pyrolysis, it was found that truss designs exhibited different shrinkages at the beam element scale despite being composed of the same preceramic Polymer and exhibiting isotropic shrinkage at the macro-truss scale. This manner of nonuniform shrinkage has rarely, if ever been reported, as it is standard practice in additive manufacturing to report only bulk linear shrinkage. In uniaxial compression, Kelvin structures with thicker beams exhibited the highest strength of 10 MPa, and octet structures exhibited the lowest strength of 3.8 MPa. In beam element flexure however, the octet beams had the highest strength, 1.9 GPa, four times stronger than the Kelvin beam elements and 500 times stronger than the octet bulk structure. Lastly, the implications for interchangeable truss structures are discussed.
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Analysis of Multi-scale Mechanical Properties of Ceramic Trusses Prepared from Preceramic Polymers
Additive manufacturing, 2019Co-Authors: Neal R. Brodnik, Johanna Schmidt, Paolo Colombo, K T FaberAbstract:Abstract To better understand the impact of complex structure on mechanical properties in additively manufactured ceramics, truss structures were 3D printed in preceramic Polymer and mechanically evaluated in the pyrolyzed SiOC state. Specimens were printed using digital light processing with a Siloxane Polymer resin blend. Four different designs were printed: two bending-dominant Kelvin cell structures, a stretching-dominant octet structure, and a mixture of the two with geometries chosen for equivalent stiffness. Mechanical characterization was done at multiple length scales: uniaxial compression to evaluate the entire truss structure, and three-point flexure to assess individual beam elements. After pyrolysis, it was found that truss designs exhibited different shrinkages at the beam element scale despite being composed of the same preceramic Polymer and exhibiting isotropic shrinkage at the macro-truss scale. This manner of nonuniform shrinkage has rarely, if ever been reported, as it is standard practice in additive manufacturing to report only bulk linear shrinkage. In uniaxial compression, Kelvin structures with thicker beams exhibited the highest strength of 10 MPa, and octet structures exhibited the lowest strength of 3.8 MPa. In beam element flexure however, the octet beams had the highest strength, 1.9 GPa, four times stronger than the Kelvin beam elements and 500 times stronger than the octet bulk structure. Lastly, the implications for interchangeable truss structures are discussed.
Jose G - One of the best experts on this subject based on the ideXlab platform.
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Erbium-Doped Nanoparticle–Polymer Composite Thin Films for Photonic Applications: Structural and Optical Properties
'American Chemical Society (ACS)', 2020Co-Authors: Kumi-barimah E, R V Penty, I H White, Bamiedakis N, Rahayu S, Mw Ziarko, Gm Kale, Jose GAbstract:Erbium-doped nanocrystal (NC)-dispersed Polymer thin films are attractive core materials for use in optical waveguides as they can provide high optical gain and enable the formation of compact waveguide amplifiers. Nonetheless, there are significant challenges associated with obtaining good dispersibility of NCs into a Polymer matrix and favorable optical properties. Therefore, in this paper, we report the fabrication of Er3+-doped ceria (EGC) NCs employing the Leeds alginate process (LAP) and their incorporation into a Siloxane Polymer matrix. The surface morphology and compositional, structural, and optical properties of the fabricated films are evaluated to assess the NC dispersion and their suitability for the waveguide amplifier. The photoluminescence (PL) and lifetime measurements of the NCs–Polymer nanocomposite thin film samples show intense, broadband PL emission of the Er3+ ions at 1534 nm (4I13/2 → 4I15/3 transition) with a full width at half-maximum (fwhm) of ∼64 nm and lifetime in the range of 2.6–3.0 ms. The inhomogeneously broadened PL spectra and improvement in lifetime of NCs in the Polymer are important results that we report. The EGC NCs–Polymer nanocomposite thin films also exhibit excellent transparency in the NIR wavelength range and a refractive index in the range of 1.53–1.58 in the visible wavelength. The work presented here clearly demonstrates the potential of using high-quality Er-doped nanocomposite Polymer thin films for interesting applications such as compact low-cost waveguide amplifiers and lasers
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Erbium-Doped Nanoparticle-Polymer Composite Thin Films for Photonic Applications: Structural and Optical Properties
2020Co-Authors: Kumi-barimah E, R V Penty, I H White, Bamiedakis N, Rahayu S, Mw Ziarko, Gm Kale, Jose GAbstract:© 2020 American Chemical Society. Erbium-doped nanocrystal (NC)-dispersed Polymer thin films are attractive core materials for use in optical waveguides as they can provide high optical gain and enable the formation of compact waveguide amplifiers. Nonetheless, there are significant challenges associated with obtaining good dispersibility of NCs into a Polymer matrix and favorable optical properties. Therefore, in this paper, we report the fabrication of Er3+-doped ceria (EGC) NCs employing the Leeds alginate process (LAP) and their incorporation into a Siloxane Polymer matrix. The surface morphology and compositional, structural, and optical properties of the fabricated films are evaluated to assess the NC dispersion and their suitability for the waveguide amplifier. The photoluminescence (PL) and lifetime measurements of the NCs-Polymer nanocomposite thin film samples show intense, broadband PL emission of the Er3+ ions at 1534 nm (4I13/2 → 4I15/3 transition) with a full width at half-maximum (fwhm) of ∼64 nm and lifetime in the range of 2.6-3.0 ms. The inhomogeneously broadened PL spectra and improvement in lifetime of NCs in the Polymer are important results that we report. The EGC NCs-Polymer nanocomposite thin films also exhibit excellent transparency in the NIR wavelength range and a refractive index in the range of 1.53-1.58 in the visible wavelength. The work presented here clearly demonstrates the potential of using high-quality Er-doped nanocomposite Polymer thin films for interesting applications such as compact low-cost waveguide amplifiers and lasers
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Erbium-Doped Nanoparticle-Polymer Composite Thin Films for Photonic Applications: Structural and Optical Properties
2020Co-Authors: Kumi-barimah E, R V Penty, I H White, Bamiedakis N, Rahayu S, Mw Ziarko, Gm Kale, Jose GAbstract:Erbium-doped nanocrystal (NC)-dispersed Polymer thin films are attractive core materials for use in optical waveguides as they can provide high optical gain and enable the formation of compact waveguide amplifiers. Nonetheless, there are significant challenges associated with obtaining good dispersibility of NCs into a Polymer matrix and favorable optical properties. Therefore, in this paper, we report the fabrication of Er -doped ceria (EGC) NCs employing the Leeds alginate process (LAP) and their incorporation into a Siloxane Polymer matrix. The surface morphology and compositional, structural, and optical properties of the fabricated films are evaluated to assess the NC dispersion and their suitability for the waveguide amplifier. The photoluminescence (PL) and lifetime measurements of the NCs-Polymer nanocomposite thin film samples show intense, broadband PL emission of the Er ions at 1534 nm ( I → I transition) with a full width at half-maximum (fwhm) of ∼64 nm and lifetime in the range of 2.6-3.0 ms. The inhomogeneously broadened PL spectra and improvement in lifetime of NCs in the Polymer are important results that we report. The EGC NCs-Polymer nanocomposite thin films also exhibit excellent transparency in the NIR wavelength range and a refractive index in the range of 1.53-1.58 in the visible wavelength. The work presented here clearly demonstrates the potential of using high-quality Er-doped nanocomposite Polymer thin films for interesting applications such as compact low-cost waveguide amplifiers and lasers. 3+ 3+ 4 4 13/2 15/
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Erbium-Doped Polymer Waveguide Amplifiers for Board-Level Optical Interconnects
'Institute of Electrical and Electronics Engineers (IEEE)', 2019Co-Authors: Ziarko M, R V Penty, Bamiedakis N, Kumi-barimah E, Jose G, I H WhiteAbstract:Optical interconnects have an important role to play in next-generation high-performance electronic systems by enabling power-efficient high-speed board-level communication links. Polymer-based optical waveguides is a leading technology for integrating optical links onto standard printed circuit boards as it is sufficiently low cost and enables cost-effective manufacturing and assembly. Various Polymer-based optical backplanes have been reported in recent years enabling different on-board interconnection architectures. However, all currently demonstrated systems are purely passive, which limits therefore the reach, complexity and functionality of these on-board systems. Here, we present recent simulation and experimental studies towards the development of Er-doped Polymer-based waveguide amplifiers. Two different approaches to integrate Er-doped materials in Siloxane Polymer are investigated: (i) ultrafast laser plasma implantation of Er-doped glasses and (ii) solution-based dispersion of Er-doped nanoparticles. Experimental and simulation results on the achievable performance from such waveguide amplifiers are presented focusing on impact of the waveguide loss and upconversion on the gain figure
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Erbium-doped Polymer waveguide amplifiers for board-level optical interconnects
'Organisation for Economic Co-Operation and Development (OECD)', 2019Co-Authors: Ziarko Marcin, Kumi-barimah E, Jose G, Bamiedakis Nikolaos, Penty Richard, I H WhiteAbstract:Optical interconnects have an important role to play in next-generation high-performance electronic systems by enabling power-efficient high-speed board-level communication links. Polymer-based optical waveguides is a leading technology for integrating optical links onto standard printed circuit boards as it is sufficiently low cost and enables cost-effective manufacturing and assembly. Various Polymer-based optical backplanes have been reported in recent years enabling different on-board interconnection architectures. However, all currently demonstrated systems are purely passive, which limits therefore the reach, complexity and functionality of these on-board systems. Here, we present recent simulation and experimental studies towards the development of Er-doped Polymer-based waveguide amplifiers. Two different approaches to integrate Er-doped materials in Siloxane Polymer are investigated: (i) ultrafast laser plasma implantation of Er-doped glasses and (ii) solution-based dispersion of Er-doped nanoparticles. Experimental and simulation results on the achievable performance from such waveguide amplifiers are presented focusing on impact of the waveguide loss and upconversion on the gain figure.The authors would like to acknowledge Dow Corning for the provision of the Polymer samples and the UK EPSRC for supporting this work through the Seamatics research grant (EP/M015165/1) and IPES CDT (EP/L015455/1)