The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
G P Chang-chien - One of the best experts on this subject based on the ideXlab platform.
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Liquid crystalline Polysiloxane Polymer as stationary phase in gas chromatography capillary column for the separation of dioxin/furan compounds.
Journal of chromatography. A, 2001Co-Authors: G P Chang-chien, W S Lee, J L Tsai, S H JenAbstract:A side-chain liquid crystalline Polysiloxane Polymer (PS3DBDE1) with high purity and high isotropic transition temperature served as a stationary phase in an attempt to chromatographize the dioxin/furan compounds. The Polymer was coated on the inner surface of a 0.25 mm I.D. capillary column by using the static coating method, forming a film with a thickness of df approximately 0.25 microm. A commercial standard solution (US EPA 1613 standard solution 1613CS4) containing polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) was used to test the chromatographic behavior of the laboratory-made capillary column. Two commercial capillary columns HP-5MS (Hewlett-Packard) and RTX-5MS (RTX) were chosen to compare their chromatographic behavior. The results show that by the use of PS3DBDE1 the isomeric pair compounds 1,2,3,4-TeCDD vs. 2,3,7,8-TeCDD and 1,2,3,4,7,8-HxCDD vs. 1,2,3,6,7,8-HxCDD and the same substituted-chlorine number compounds 1,2,3,4,6,7,8-HpCDF vs. 1,2.3,4,6,7,8-HpCDD and 1,2,3,4,6,7,8,9-OCDD vs. 1,2,3,4,6,7,8,9-OCDF had higher resolution than HP-5MS and RTX-5MS as suggested by the column makers.
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Liquid crystalline Polysiloxane Polymer as stationary phase in gas chromatography capillary column for the separation of dioxin/furan compounds.
Journal of Chromatography A, 2001Co-Authors: G P Chang-chien, W S Lee, J L Tsai, Shwu-huney JengAbstract:Abstract A side-chain liquid crystalline Polysiloxane Polymer (PS3DBDE1) with high purity and high isotropic transition temperature served as a stationary phase in an attempt to chromatographize the dioxin/furan compounds. The Polymer was coated on the inner surface of a 0.25 mm I.D. capillary column by using the static coating method, forming a film with a thickness of d f ≈0.25 μm. A commercial standard solution (US EPA 1613 standard solution 1613CS4) containing polychlorinated dibenzo- p -dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) was used to test the chromatographic behavior of the laboratory-made capillary column. Two commercial capillary columns HP-5MS (Hewlett-Packard) and RTX-5MS (RTX) were chosen to compare their chromatographic behavior. The results show that by the use of PS3DBDE1 the isomeric pair compounds 1,2,3,4-TeCDD vs. 2,3,7,8-TeCDD and 1,2,3,4,7,8-HxCDD vs. 1,2,3,6,7,8-HxCDD and the same substituted-chlorine number compounds 1,2,3,4,6,7,8-HpCDF vs. 1,2,3,4,6,7,8-HpCDD and 1,2,3,4,6,7,8,9-OCDD vs. 1,2,3,4,6,7,8,9-OCDF had higher resolution than HP-5MS and RTX-5MS as suggested by the column makers.
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All-hydrocarbon liquid crystalline Polysiloxane Polymer as stationary phase in gas chromatography capillary column for separation of isomeric compounds of polynuclear aromatic hydrocarbons.
Analytical chemistry, 1998Co-Authors: W S Lee, G P Chang-chienAbstract:Two new and high-purity all-hydrocarbon side-chain liquid crystalline Polysiloxane Polymers were synthesized by grafting all-hydrocarbon liquid crystal monomers onto a polymethylhydrosiloxane backbone. The two Polysiloxane Polymers show both smectic B and E mesophases which were characterized by (differential scanning calorimetry and X-ray analysis. As stationary phases, these liquid crystalline Polysiloxane Polymers were coated on the inner surface of a capillary column (i.d. = 0.32 mm, film thickness df ≈ 0.25 μm) using the static coating method. The capillary column was installed on a GC/MS instrument. We used a standard commercial mixture of 21 species of polynuclear aromatic hydrocarbons (purchased from Supelco Co. and Merck Co.) to test the chromatographic behavior of the coated stationary phase. Test results of the isomeric pair compounds show a better separation resolution than identical tests using the commercial HP-5 capillary column, which is a standard and state-of-the-art analytical tool for ...
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Terminally carboxyl oligo(ethylene oxide) monomethyl ethers-substituted side chain liquid crystalline Polysiloxane Polymer as stationary phase in capillary gas chromatography for the separation of polynuclear aromatic hydrocarbons
Journal of Chromatography A, 1998Co-Authors: G P Chang-chienAbstract:Abstract Through esterification, acyl halide addition and monomer-grafting reactions, three new side chain liquid crystalline Polysiloxane Polymers containing an oligo(ethylene oxide) monomethyl group as their respective terminal group, poly (4-[(2-methylethoxy)carbonyl]phenyl 4-[4-(allyloxyl)-phenyl]benzoate) (PBPBE1), poly (4-[(2-(2-methylethoxy)ethoxy)carbonyl]phenyl4-[4-(allyloxyl)-phenyl]benzoate) (PBPBE2) and poly (4-[(2-(2-(2-methylethoxy) ethoxy) ethoxy) carbonyl]phenyl 4-[4-(allyloxyl)-phenyl]benzoate) (PBPBE3) were synthesized. These liquid crystalline Polysiloxane Polymers were coated onto the inner surface of a capillary column (I.D.=0.32 mm, film thickness df≈0.2 μm) to test the chromatographic behavior of the critical pairs 5–6, 9–10 and 11–12 from the Supelco 610M standard mixture polynuclear aromatic hydrocarbon compounds. Results show that the experimental columns give better separation resolution and can be employed over a wider temperature range than the commercial HP-5 capillary column (Hewlett–Packard).
Robert West - One of the best experts on this subject based on the ideXlab platform.
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new interpenetrating network type poly siloxane g ethylene oxide Polymer electrolyte for lithium battery
Journal of Power Sources, 2003Co-Authors: Bookeun Oh, D R Vissers, Zhengcheng Zhang, Robert West, H Tsukamoto, Khalil AmineAbstract:Abstract We fabricated an interpenetrating network type solid Polymer electrolyte with a promising mono-comb type poly(siloxane-g-ethylene oxide) for lithium rechargeable battery. The ionic conductivity of the network Polymer electrolyte was closed to 10−4 S/cm at near room temperature. Initial cycling result from LiNi0.8Co0.2O2/Polymer electrolyte/lithium metal cell shows excellent cycling characteristics with no capacity fade in a solid electrolyte system. The new Polysiloxane Polymer electrolyte could be a promising system for large batteries that necessitate long life and inherent safety such as batteries for electric vehicle applications.
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a highly conductive solid state Polymer electrolyte based on a double comb Polysiloxane Polymer with oligo ethylene oxide side chains
Organometallics, 1999Co-Authors: Richard Hooper, Leslie J Lyons, David A Moline, Robert WestAbstract:A double-comb Polysiloxane with ethylene oxide side chains, poly[bis(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)propylsiloxane] (1), has been prepared. The conductivity and thermal properties of this Polymer are compared to those of a single-comb Polysiloxane, −[CH3RSiO]n− (2), which contains an equal number of oxygen donor atoms. Maximum conductivities of 3.9 × 10-4 S cm-1 for 1 and 1.0 × 10-4 S cm-1 for 2 were found at room temperature with oxygen to Li+ ratios of about 40:1.
W S Lee - One of the best experts on this subject based on the ideXlab platform.
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Liquid crystalline Polysiloxane Polymer as stationary phase in gas chromatography capillary column for the separation of dioxin/furan compounds.
Journal of chromatography. A, 2001Co-Authors: G P Chang-chien, W S Lee, J L Tsai, S H JenAbstract:A side-chain liquid crystalline Polysiloxane Polymer (PS3DBDE1) with high purity and high isotropic transition temperature served as a stationary phase in an attempt to chromatographize the dioxin/furan compounds. The Polymer was coated on the inner surface of a 0.25 mm I.D. capillary column by using the static coating method, forming a film with a thickness of df approximately 0.25 microm. A commercial standard solution (US EPA 1613 standard solution 1613CS4) containing polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) was used to test the chromatographic behavior of the laboratory-made capillary column. Two commercial capillary columns HP-5MS (Hewlett-Packard) and RTX-5MS (RTX) were chosen to compare their chromatographic behavior. The results show that by the use of PS3DBDE1 the isomeric pair compounds 1,2,3,4-TeCDD vs. 2,3,7,8-TeCDD and 1,2,3,4,7,8-HxCDD vs. 1,2,3,6,7,8-HxCDD and the same substituted-chlorine number compounds 1,2,3,4,6,7,8-HpCDF vs. 1,2.3,4,6,7,8-HpCDD and 1,2,3,4,6,7,8,9-OCDD vs. 1,2,3,4,6,7,8,9-OCDF had higher resolution than HP-5MS and RTX-5MS as suggested by the column makers.
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Liquid crystalline Polysiloxane Polymer as stationary phase in gas chromatography capillary column for the separation of dioxin/furan compounds.
Journal of Chromatography A, 2001Co-Authors: G P Chang-chien, W S Lee, J L Tsai, Shwu-huney JengAbstract:Abstract A side-chain liquid crystalline Polysiloxane Polymer (PS3DBDE1) with high purity and high isotropic transition temperature served as a stationary phase in an attempt to chromatographize the dioxin/furan compounds. The Polymer was coated on the inner surface of a 0.25 mm I.D. capillary column by using the static coating method, forming a film with a thickness of d f ≈0.25 μm. A commercial standard solution (US EPA 1613 standard solution 1613CS4) containing polychlorinated dibenzo- p -dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) was used to test the chromatographic behavior of the laboratory-made capillary column. Two commercial capillary columns HP-5MS (Hewlett-Packard) and RTX-5MS (RTX) were chosen to compare their chromatographic behavior. The results show that by the use of PS3DBDE1 the isomeric pair compounds 1,2,3,4-TeCDD vs. 2,3,7,8-TeCDD and 1,2,3,4,7,8-HxCDD vs. 1,2,3,6,7,8-HxCDD and the same substituted-chlorine number compounds 1,2,3,4,6,7,8-HpCDF vs. 1,2,3,4,6,7,8-HpCDD and 1,2,3,4,6,7,8,9-OCDD vs. 1,2,3,4,6,7,8,9-OCDF had higher resolution than HP-5MS and RTX-5MS as suggested by the column makers.
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All-hydrocarbon liquid crystalline Polysiloxane Polymer as stationary phase in gas chromatography capillary column for separation of isomeric compounds of polynuclear aromatic hydrocarbons.
Analytical chemistry, 1998Co-Authors: W S Lee, G P Chang-chienAbstract:Two new and high-purity all-hydrocarbon side-chain liquid crystalline Polysiloxane Polymers were synthesized by grafting all-hydrocarbon liquid crystal monomers onto a polymethylhydrosiloxane backbone. The two Polysiloxane Polymers show both smectic B and E mesophases which were characterized by (differential scanning calorimetry and X-ray analysis. As stationary phases, these liquid crystalline Polysiloxane Polymers were coated on the inner surface of a capillary column (i.d. = 0.32 mm, film thickness df ≈ 0.25 μm) using the static coating method. The capillary column was installed on a GC/MS instrument. We used a standard commercial mixture of 21 species of polynuclear aromatic hydrocarbons (purchased from Supelco Co. and Merck Co.) to test the chromatographic behavior of the coated stationary phase. Test results of the isomeric pair compounds show a better separation resolution than identical tests using the commercial HP-5 capillary column, which is a standard and state-of-the-art analytical tool for ...
Ralf Riedel - One of the best experts on this subject based on the ideXlab platform.
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Template-free synthesis of Polymer-derived mesoporous SiOC/TiO2 and SiOC/N-doped TiO2 ceramic composites for application in the removal of organic dyes from contaminated water
Applied Catalysis B-environmental, 2011Co-Authors: Mirabbos Hojamberdiev, Ravi Mohan Prasad, Koji Morita, Yongfa Zhu, Marco Antônio Schiavon, Aleksander Gurlo, Ralf RiedelAbstract:Abstract Mesoporous SiOC/TiO2 and SiOC/N-doped TiO2 (nitrogen-doped TiO2) ceramic composites were prepared by the incorporation of TiO2 (containing 65 wt.% anatase and 35 wt.% rutile) and N-doped TiO2 powders into vinyl-functionalized Polysiloxane Polymer followed by pyrolysis at 700–900 °C for 2 h in argon atmosphere. The N-doped TiO2 powders were obtained by ammonolysis of commercial TiO2 nanopowders. The resulting samples were characterized by means of X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and nitrogen physisorption. The specific surface area (SBET) values of the as-prepared SiOC ceramic and SiOC/TiO2 and SiOC/N-doped TiO2 ceramic composites decreased with increasing the pyrolysis temperature due to a gradual collapse of small pores. A transformation from microporous SiOC ceramic (pore-size
Barry Luther-davies - One of the best experts on this subject based on the ideXlab platform.
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Low loss high index contrast nanoimprinted Polysiloxane waveguides
Optics express, 2009Co-Authors: Ting Han, Steve Madden, Mathew Zhang, Robbie Charters, Barry Luther-daviesAbstract:Nanoimprint lithography is gaining rapid acceptance in fields as diverse as microelectronics and microfluidics due to its simplicity high resolution and low cost. These properties are critically important for the fabrication of photonic devices, where cost is often the major inhibiting deployment factor for high volume applications. We report here on the use of nanoimprint technology to fabricate low loss broadband high index contrast waveguides in a Polysiloxane Polymer system for the first time.
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Low cost nanoimprinted Polymer waveguides
Conference on Optoelectronic and Microelectronic Materials and Devices Proceedings COMMAD, 2008Co-Authors: Steve Madden, Mathew Zhang, Robbie Charters, Barry Luther-daviesAbstract:We report here on the use of nanoimprint technology to fabricate low cost planar waveguides in a Polysiloxane Polymer system capable of passing the stringent Telcordia environmental and reliability criteria. Low loss buried channel waveguides with core cross sections of 3 times 3 microns and a 2% refractive index contrast were fabricated on bare silicon wafers with a simple and fast four step process using a 100 mm diameter polydimethylsiloxane (PDMS) stamp. The waveguides were patterned using an innovative ldquominimum fluid displacementrdquo method which eliminated the residual films often seen either side of rib like features such as the waveguide cores, and which also produced very good dimensional control of the core itself regardless of the uncured spun core layer thickness.