The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Zhongping Zhang - One of the best experts on this subject based on the ideXlab platform.
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selecti...
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Qingsong Mei, Renyong Liu, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selectively bind TNT by the formation of Meisenheimer complex, leading to the green Fluorescence quenching due to resonance energy transfer. The variations of the two Fluorescence intensity ratios display continuous color changes from yellow-green to red upon exposure to different amounts of TNT. By immobilization of the probes on a piece of filter paper, a fingerprint lifting technique has been innovated to visualize trace TNT particulates on various surfaces by the appearance of a different color against a yellow-green background under a UV lamp. This method shows high selectivity and sensitivity with a detection limit as low as 5 ng/mm(2) on a manila envelope and the attribute of being seen with the naked eye.
Kui Zhang - One of the best experts on this subject based on the ideXlab platform.
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selecti...
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Qingsong Mei, Renyong Liu, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selectively bind TNT by the formation of Meisenheimer complex, leading to the green Fluorescence quenching due to resonance energy transfer. The variations of the two Fluorescence intensity ratios display continuous color changes from yellow-green to red upon exposure to different amounts of TNT. By immobilization of the probes on a piece of filter paper, a fingerprint lifting technique has been innovated to visualize trace TNT particulates on various surfaces by the appearance of a different color against a yellow-green background under a UV lamp. This method shows high selectivity and sensitivity with a detection limit as low as 5 ng/mm(2) on a manila envelope and the attribute of being seen with the naked eye.
Saša Svetina - One of the best experts on this subject based on the ideXlab platform.
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Asymmetrical labeling of giant phospholipid vesicles.
Pflügers Archiv: European Journal of Physiology, 2000Co-Authors: Gregor Gomišček, Vesna Arrigler, Marjan Gros, Mirjana Zupančič, Saša SvetinaAbstract:The method for labeling of inner membrane leaflet in unilamellar giant POPC vesicles was developed and characterised. Symmetrically NBD-PC labeled vesicles were treated by sodium dithionite, which undergoes an irreversible chemical reaction with NBD-PC molecule making it non-fluorescent. After the addition of dithionite the Fluorescence on single vesicles as well as on vesicle suspension showed a 50 % decrease of its initial value corresponding to marker quenching in the outer leaflet. Hence, flourimetry as well as flourescence microscopy prove that dithionite quenching is a suitable method to induce an asymmetrical labeling of the NBD-PC marked giant vesicles.
Haibo Zhou - One of the best experts on this subject based on the ideXlab platform.
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selecti...
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Qingsong Mei, Renyong Liu, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selectively bind TNT by the formation of Meisenheimer complex, leading to the green Fluorescence quenching due to resonance energy transfer. The variations of the two Fluorescence intensity ratios display continuous color changes from yellow-green to red upon exposure to different amounts of TNT. By immobilization of the probes on a piece of filter paper, a fingerprint lifting technique has been innovated to visualize trace TNT particulates on various surfaces by the appearance of a different color against a yellow-green background under a UV lamp. This method shows high selectivity and sensitivity with a detection limit as low as 5 ng/mm(2) on a manila envelope and the attribute of being seen with the naked eye.
Suhua Wang - One of the best experts on this subject based on the ideXlab platform.
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selecti...
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instant visual detection of trinitrotoluene particulates on various surfaces by ratiometric Fluorescence of dual emission quantum dots hybrid
Journal of the American Chemical Society, 2011Co-Authors: Kui Zhang, Haibo Zhou, Suhua Wang, Guijian Guan, Jian Zhang, Qingsong Mei, Renyong Liu, Zhongping ZhangAbstract:To detect trace trinitrotoluene (TNT) explosives deposited on various surfaces instantly and on-site still remains a challenge for homeland security needs against terrorism. This work demonstrates a new concept and its utility for visual detection of TNT particulates on various package materials. The concept takes advantages of the superior fluorescent properties of quantum dots (QDs) for visual signal output via ratiometric Fluorescence, the feasibility of surface grafting of QDs for chemical recognition of TNT, and the ease of operation of the fingerprint lifting technique. Two differently sized CdTe QDs emitting red and green Fluorescences, respectively, have been hybridized by embedding the red-emitting one in silica nanoparticles and covalently linking the green-emitting one to the silica surface, respectively, to form a dual-emissive fluorescent hybrid nanoparticle. The Fluorescence of red QDs in the silica nanoparticles stays constant, whereas the green QDs functionalized with polyamine can selectively bind TNT by the formation of Meisenheimer complex, leading to the green Fluorescence quenching due to resonance energy transfer. The variations of the two Fluorescence intensity ratios display continuous color changes from yellow-green to red upon exposure to different amounts of TNT. By immobilization of the probes on a piece of filter paper, a fingerprint lifting technique has been innovated to visualize trace TNT particulates on various surfaces by the appearance of a different color against a yellow-green background under a UV lamp. This method shows high selectivity and sensitivity with a detection limit as low as 5 ng/mm(2) on a manila envelope and the attribute of being seen with the naked eye.
