The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Zhijun Zhang - One of the best experts on this subject based on the ideXlab platform.
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preparation of surface modified lanthanum fluoride graphene oxide nanohybrids and evaluation of their tribological properties as lubricant additive in liquid paraffin
Applied Surface Science, 2016Co-Authors: Cuizhen Yang, Laigui Yu, Zhiwei Li, Xiaohong Li, Zhijun ZhangAbstract:Abstract Oleic acid surface–modified Lanthanum trifluoride–graphene oxide (OA–LaF3–GO) nanohybrids were successfully prepared by surface modification technology. The morphology and phase structure of as-prepared samples were analyzed by means of X-ray diffraction and transmission electron microscopy, Fourier transform infrared spectrometry, Raman spectrometry and thermogravimetry. The results revealed that OA were bonded onto the surface of LaF3–GO nanohybrids. Subsequently, the tribological properties of OA–LaF3–GO nanohybrids as lubricant additive in liquid paraffin were evaluated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined on a scanning electron microscope with an Energy Dispersive Spectrometer. Tribological results showed that OA–LaF3–GO nanohybrids had excellent friction reduction and antiwear ability at the loading of 0.5 wt.% OA–LaF3–GO nanohybrids, compared to liquid paraffin alone. The results of Energy Dispersive Spectrometer revealed that improved tribological properties resulted from OA–LaF3–GO could transfer to the rubbed steel surface and decompose to form protective layers, which help to improve tribological properties.
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Preparation of surface–modified lanthanum fluoride–graphene oxide nanohybrids and evaluation of their tribological properties as lubricant additive in liquid paraffin
Applied Surface Science, 2016Co-Authors: Cuizhen Yang, Xiao Hou, Zhijun ZhangAbstract:Abstract Oleic acid surface–modified Lanthanum trifluoride–graphene oxide (OA–LaF3–GO) nanohybrids were successfully prepared by surface modification technology. The morphology and phase structure of as-prepared samples were analyzed by means of X-ray diffraction and transmission electron microscopy, Fourier transform infrared spectrometry, Raman spectrometry and thermogravimetry. The results revealed that OA were bonded onto the surface of LaF3–GO nanohybrids. Subsequently, the tribological properties of OA–LaF3–GO nanohybrids as lubricant additive in liquid paraffin were evaluated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined on a scanning electron microscope with an Energy Dispersive Spectrometer. Tribological results showed that OA–LaF3–GO nanohybrids had excellent friction reduction and antiwear ability at the loading of 0.5 wt.% OA–LaF3–GO nanohybrids, compared to liquid paraffin alone. The results of Energy Dispersive Spectrometer revealed that improved tribological properties resulted from OA–LaF3–GO could transfer to the rubbed steel surface and decompose to form protective layers, which help to improve tribological properties.
Cuizhen Yang - One of the best experts on this subject based on the ideXlab platform.
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preparation of surface modified lanthanum fluoride graphene oxide nanohybrids and evaluation of their tribological properties as lubricant additive in liquid paraffin
Applied Surface Science, 2016Co-Authors: Cuizhen Yang, Laigui Yu, Zhiwei Li, Xiaohong Li, Zhijun ZhangAbstract:Abstract Oleic acid surface–modified Lanthanum trifluoride–graphene oxide (OA–LaF3–GO) nanohybrids were successfully prepared by surface modification technology. The morphology and phase structure of as-prepared samples were analyzed by means of X-ray diffraction and transmission electron microscopy, Fourier transform infrared spectrometry, Raman spectrometry and thermogravimetry. The results revealed that OA were bonded onto the surface of LaF3–GO nanohybrids. Subsequently, the tribological properties of OA–LaF3–GO nanohybrids as lubricant additive in liquid paraffin were evaluated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined on a scanning electron microscope with an Energy Dispersive Spectrometer. Tribological results showed that OA–LaF3–GO nanohybrids had excellent friction reduction and antiwear ability at the loading of 0.5 wt.% OA–LaF3–GO nanohybrids, compared to liquid paraffin alone. The results of Energy Dispersive Spectrometer revealed that improved tribological properties resulted from OA–LaF3–GO could transfer to the rubbed steel surface and decompose to form protective layers, which help to improve tribological properties.
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Preparation of surface–modified lanthanum fluoride–graphene oxide nanohybrids and evaluation of their tribological properties as lubricant additive in liquid paraffin
Applied Surface Science, 2016Co-Authors: Cuizhen Yang, Xiao Hou, Zhijun ZhangAbstract:Abstract Oleic acid surface–modified Lanthanum trifluoride–graphene oxide (OA–LaF3–GO) nanohybrids were successfully prepared by surface modification technology. The morphology and phase structure of as-prepared samples were analyzed by means of X-ray diffraction and transmission electron microscopy, Fourier transform infrared spectrometry, Raman spectrometry and thermogravimetry. The results revealed that OA were bonded onto the surface of LaF3–GO nanohybrids. Subsequently, the tribological properties of OA–LaF3–GO nanohybrids as lubricant additive in liquid paraffin were evaluated with a four-ball machine, and the morphology and elemental composition of worn steel surfaces were examined on a scanning electron microscope with an Energy Dispersive Spectrometer. Tribological results showed that OA–LaF3–GO nanohybrids had excellent friction reduction and antiwear ability at the loading of 0.5 wt.% OA–LaF3–GO nanohybrids, compared to liquid paraffin alone. The results of Energy Dispersive Spectrometer revealed that improved tribological properties resulted from OA–LaF3–GO could transfer to the rubbed steel surface and decompose to form protective layers, which help to improve tribological properties.
Keiichi Tanaka - One of the best experts on this subject based on the ideXlab platform.
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development of an Energy Dispersive Spectrometer for a transmission electron microscope utilizing a tes microcalorimeter array
THE THIRTEENTH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS—LTD13, 2009Co-Authors: Keiichi Tanaka, Kazuhisa Mitsuda, Tom Hara, Keisuke Maehata, Noriko Y. Yamasaki, Akikazu Odawara, Atsushi Nagata, Katsuaki Watanabe, Yoh TakeiAbstract:A high‐Energy‐resolution Energy Dispersive Spectrometer (EDS) utilizing a TES (transition edge sensor) microcalorimeter array is developed for a transmission electron microscope (TEM). The goals of the development are (1) an Energy range of 0.3–10 keV, (2) an Energy resolution of FWHM <10 eV, (3) a maximum counting rate of 3 kcps, and (4) a cryogen‐free cooling system. We adopted a dilution refrigerator (DR) pre‐cooled by a Gifford‐McMahon (GM) refrigerator to cool the TES microcalorimeter to ∼100 mK. In order to avoid micro phonics of GM fridge to propagate to the TEM, pressurized He gas is circulated between the DR and the GM to reject heat from the DR. The GM is mechanically well isolated from the TEM. In oder to obtain 3 kcps counting rate, we utilize a ten pixel TES array and read out the signals in parallel wtih ten analog signal channels from cryogenic to room temperature electronics. One of the pixels can be always irradiated by a radio isotope for Energy calibration. As the first step, we have attached a single pixel TES system cooled by the cryogen‐free cooling system to the TEM and obtained an Energy resolution of 8 eV at 1.8 keV without degrading the spatial resolution of the TEM at a 2 A level. A ten pixel TES system is also being developed from the front‐end detector assembly to the room temperature digital electronics. We describe the signal processing system and packaging of the detector assembly.
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Transition Edge Sensor-Energy Dispersive Spectrometer (TES-EDS) and Its Applications
IEICE Transactions on Electronics, 2009Co-Authors: Keiichi Tanaka, Akikazu Odawara, Atsushi Nagata, Yukari Baba, Satoshi Nakayama, Shigenori Aida, Toshimitsu Morooka, Yoshikazu Homma, Izumi Nakai, Kazuo ChinoneAbstract:The Transition Edge Sensor (TES)-Energy Dispersive Spectrometer (EDS) is an X-ray detector with high-Energy resolution (12.8eV). The TES can be mounted to a scanning electron microscope (SEM). The TES-EDS is based on a cryogen-free dilution refrigerator. The high-Energy resolution enables analysis of the distribution of various elements in samples under low acceleration voltage (typically under 5keV) by using K-lines of light elements and M lines of heavy elements. For example, the Energy of the arsenic L line differs from the magnesium K line by 28eV. When used to analyze the spore of the Pteris vittata L plant, the TES-EDS clearly reveals a different distribution of As and Mg in the micro region of the plant. The TES-EDS with SEM yields detailed information about the distribution of multi-elements in a sample.
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Development of an Energy Dispersive Spectrometer for a transmission electron microscope utilizing a TES microcalorimeter array
2009Co-Authors: Keiichi Tanaka, Kazuhisa Mitsuda, Tom Hara, Keisuke Maehata, Noriko Y. Yamasaki, Akikazu Odawara, Atsushi Nagata, Katsuaki Watanabe, Yoh TakeiAbstract:A high‐Energy‐resolution Energy Dispersive Spectrometer (EDS) utilizing a TES (transition edge sensor) microcalorimeter array is developed for a transmission electron microscope (TEM). The goals of the development are (1) an Energy range of 0.3–10 keV, (2) an Energy resolution of FWHM
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Transition edge sensor-Energy-Dispersive Spectrometer (TES-EDS) using a cryogen-free dilution refrigerator for material analysis
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2006Co-Authors: Keiichi Tanaka, Akikazu Odawara, Atsushi Nagata, Yukari Baba, Satoshi Nakayama, Ikeda Masanori, Kazuo ChinoneAbstract:Abstract A cryogen-free Energy-Dispersive Spectrometer (EDS) using a transition edge sensor (TES) was developed for material analysis. This system can maintain a temperature at 130 mK within 30 μK, and has good Energy resolution (19 eV for Mn-Kα) for long-time measurement with a drift in the DC level of less than 0.02 eV/min. This system utilizes a dilution refrigerator (φ 272 mm×height 572 mm) and has a snout (370 mm long and φ25 mm) similar to that in a conventional EDS system. The dilution refrigerator is pre-cooled by a GM refrigerator. A flexible tube between the dilution refrigerator and GM refrigerator damps the mechanical vibration of the GM refrigerator. Two shields (4 and 80 K) thermally protect the Cu rod (φ8 mm) cooled to be 100 mK. Windows composed of polyimide+Al film allow X-ray detection above the C-Kα line. A TES (6 mm×6 mm) and array SQUID amplifier (1.5 mm×3 mm) are mounted on top of the Cu rod. For Mn-Kα, the pulse height is 5.5 μA and decay time (τeff) is 90 μs. The maximum count rate (1/20 τeff) is estimated at about 500 cps.
Akikazu Odawara - One of the best experts on this subject based on the ideXlab platform.
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development of an Energy Dispersive Spectrometer for a transmission electron microscope utilizing a tes microcalorimeter array
THE THIRTEENTH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS—LTD13, 2009Co-Authors: Keiichi Tanaka, Kazuhisa Mitsuda, Tom Hara, Keisuke Maehata, Noriko Y. Yamasaki, Akikazu Odawara, Atsushi Nagata, Katsuaki Watanabe, Yoh TakeiAbstract:A high‐Energy‐resolution Energy Dispersive Spectrometer (EDS) utilizing a TES (transition edge sensor) microcalorimeter array is developed for a transmission electron microscope (TEM). The goals of the development are (1) an Energy range of 0.3–10 keV, (2) an Energy resolution of FWHM <10 eV, (3) a maximum counting rate of 3 kcps, and (4) a cryogen‐free cooling system. We adopted a dilution refrigerator (DR) pre‐cooled by a Gifford‐McMahon (GM) refrigerator to cool the TES microcalorimeter to ∼100 mK. In order to avoid micro phonics of GM fridge to propagate to the TEM, pressurized He gas is circulated between the DR and the GM to reject heat from the DR. The GM is mechanically well isolated from the TEM. In oder to obtain 3 kcps counting rate, we utilize a ten pixel TES array and read out the signals in parallel wtih ten analog signal channels from cryogenic to room temperature electronics. One of the pixels can be always irradiated by a radio isotope for Energy calibration. As the first step, we have attached a single pixel TES system cooled by the cryogen‐free cooling system to the TEM and obtained an Energy resolution of 8 eV at 1.8 keV without degrading the spatial resolution of the TEM at a 2 A level. A ten pixel TES system is also being developed from the front‐end detector assembly to the room temperature digital electronics. We describe the signal processing system and packaging of the detector assembly.
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Transition Edge Sensor-Energy Dispersive Spectrometer (TES-EDS) and Its Applications
IEICE Transactions on Electronics, 2009Co-Authors: Keiichi Tanaka, Akikazu Odawara, Atsushi Nagata, Yukari Baba, Satoshi Nakayama, Shigenori Aida, Toshimitsu Morooka, Yoshikazu Homma, Izumi Nakai, Kazuo ChinoneAbstract:The Transition Edge Sensor (TES)-Energy Dispersive Spectrometer (EDS) is an X-ray detector with high-Energy resolution (12.8eV). The TES can be mounted to a scanning electron microscope (SEM). The TES-EDS is based on a cryogen-free dilution refrigerator. The high-Energy resolution enables analysis of the distribution of various elements in samples under low acceleration voltage (typically under 5keV) by using K-lines of light elements and M lines of heavy elements. For example, the Energy of the arsenic L line differs from the magnesium K line by 28eV. When used to analyze the spore of the Pteris vittata L plant, the TES-EDS clearly reveals a different distribution of As and Mg in the micro region of the plant. The TES-EDS with SEM yields detailed information about the distribution of multi-elements in a sample.
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Development of an Energy Dispersive Spectrometer for a transmission electron microscope utilizing a TES microcalorimeter array
2009Co-Authors: Keiichi Tanaka, Kazuhisa Mitsuda, Tom Hara, Keisuke Maehata, Noriko Y. Yamasaki, Akikazu Odawara, Atsushi Nagata, Katsuaki Watanabe, Yoh TakeiAbstract:A high‐Energy‐resolution Energy Dispersive Spectrometer (EDS) utilizing a TES (transition edge sensor) microcalorimeter array is developed for a transmission electron microscope (TEM). The goals of the development are (1) an Energy range of 0.3–10 keV, (2) an Energy resolution of FWHM
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Transition edge sensor-Energy-Dispersive Spectrometer (TES-EDS) using a cryogen-free dilution refrigerator for material analysis
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2006Co-Authors: Keiichi Tanaka, Akikazu Odawara, Atsushi Nagata, Yukari Baba, Satoshi Nakayama, Ikeda Masanori, Kazuo ChinoneAbstract:Abstract A cryogen-free Energy-Dispersive Spectrometer (EDS) using a transition edge sensor (TES) was developed for material analysis. This system can maintain a temperature at 130 mK within 30 μK, and has good Energy resolution (19 eV for Mn-Kα) for long-time measurement with a drift in the DC level of less than 0.02 eV/min. This system utilizes a dilution refrigerator (φ 272 mm×height 572 mm) and has a snout (370 mm long and φ25 mm) similar to that in a conventional EDS system. The dilution refrigerator is pre-cooled by a GM refrigerator. A flexible tube between the dilution refrigerator and GM refrigerator damps the mechanical vibration of the GM refrigerator. Two shields (4 and 80 K) thermally protect the Cu rod (φ8 mm) cooled to be 100 mK. Windows composed of polyimide+Al film allow X-ray detection above the C-Kα line. A TES (6 mm×6 mm) and array SQUID amplifier (1.5 mm×3 mm) are mounted on top of the Cu rod. For Mn-Kα, the pulse height is 5.5 μA and decay time (τeff) is 90 μs. The maximum count rate (1/20 τeff) is estimated at about 500 cps.
Atsushi Nagata - One of the best experts on this subject based on the ideXlab platform.
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development of an Energy Dispersive Spectrometer for a transmission electron microscope utilizing a tes microcalorimeter array
THE THIRTEENTH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS—LTD13, 2009Co-Authors: Keiichi Tanaka, Kazuhisa Mitsuda, Tom Hara, Keisuke Maehata, Noriko Y. Yamasaki, Akikazu Odawara, Atsushi Nagata, Katsuaki Watanabe, Yoh TakeiAbstract:A high‐Energy‐resolution Energy Dispersive Spectrometer (EDS) utilizing a TES (transition edge sensor) microcalorimeter array is developed for a transmission electron microscope (TEM). The goals of the development are (1) an Energy range of 0.3–10 keV, (2) an Energy resolution of FWHM <10 eV, (3) a maximum counting rate of 3 kcps, and (4) a cryogen‐free cooling system. We adopted a dilution refrigerator (DR) pre‐cooled by a Gifford‐McMahon (GM) refrigerator to cool the TES microcalorimeter to ∼100 mK. In order to avoid micro phonics of GM fridge to propagate to the TEM, pressurized He gas is circulated between the DR and the GM to reject heat from the DR. The GM is mechanically well isolated from the TEM. In oder to obtain 3 kcps counting rate, we utilize a ten pixel TES array and read out the signals in parallel wtih ten analog signal channels from cryogenic to room temperature electronics. One of the pixels can be always irradiated by a radio isotope for Energy calibration. As the first step, we have attached a single pixel TES system cooled by the cryogen‐free cooling system to the TEM and obtained an Energy resolution of 8 eV at 1.8 keV without degrading the spatial resolution of the TEM at a 2 A level. A ten pixel TES system is also being developed from the front‐end detector assembly to the room temperature digital electronics. We describe the signal processing system and packaging of the detector assembly.
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Transition Edge Sensor-Energy Dispersive Spectrometer (TES-EDS) and Its Applications
IEICE Transactions on Electronics, 2009Co-Authors: Keiichi Tanaka, Akikazu Odawara, Atsushi Nagata, Yukari Baba, Satoshi Nakayama, Shigenori Aida, Toshimitsu Morooka, Yoshikazu Homma, Izumi Nakai, Kazuo ChinoneAbstract:The Transition Edge Sensor (TES)-Energy Dispersive Spectrometer (EDS) is an X-ray detector with high-Energy resolution (12.8eV). The TES can be mounted to a scanning electron microscope (SEM). The TES-EDS is based on a cryogen-free dilution refrigerator. The high-Energy resolution enables analysis of the distribution of various elements in samples under low acceleration voltage (typically under 5keV) by using K-lines of light elements and M lines of heavy elements. For example, the Energy of the arsenic L line differs from the magnesium K line by 28eV. When used to analyze the spore of the Pteris vittata L plant, the TES-EDS clearly reveals a different distribution of As and Mg in the micro region of the plant. The TES-EDS with SEM yields detailed information about the distribution of multi-elements in a sample.
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Development of an Energy Dispersive Spectrometer for a transmission electron microscope utilizing a TES microcalorimeter array
2009Co-Authors: Keiichi Tanaka, Kazuhisa Mitsuda, Tom Hara, Keisuke Maehata, Noriko Y. Yamasaki, Akikazu Odawara, Atsushi Nagata, Katsuaki Watanabe, Yoh TakeiAbstract:A high‐Energy‐resolution Energy Dispersive Spectrometer (EDS) utilizing a TES (transition edge sensor) microcalorimeter array is developed for a transmission electron microscope (TEM). The goals of the development are (1) an Energy range of 0.3–10 keV, (2) an Energy resolution of FWHM
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Transition edge sensor-Energy-Dispersive Spectrometer (TES-EDS) using a cryogen-free dilution refrigerator for material analysis
Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 2006Co-Authors: Keiichi Tanaka, Akikazu Odawara, Atsushi Nagata, Yukari Baba, Satoshi Nakayama, Ikeda Masanori, Kazuo ChinoneAbstract:Abstract A cryogen-free Energy-Dispersive Spectrometer (EDS) using a transition edge sensor (TES) was developed for material analysis. This system can maintain a temperature at 130 mK within 30 μK, and has good Energy resolution (19 eV for Mn-Kα) for long-time measurement with a drift in the DC level of less than 0.02 eV/min. This system utilizes a dilution refrigerator (φ 272 mm×height 572 mm) and has a snout (370 mm long and φ25 mm) similar to that in a conventional EDS system. The dilution refrigerator is pre-cooled by a GM refrigerator. A flexible tube between the dilution refrigerator and GM refrigerator damps the mechanical vibration of the GM refrigerator. Two shields (4 and 80 K) thermally protect the Cu rod (φ8 mm) cooled to be 100 mK. Windows composed of polyimide+Al film allow X-ray detection above the C-Kα line. A TES (6 mm×6 mm) and array SQUID amplifier (1.5 mm×3 mm) are mounted on top of the Cu rod. For Mn-Kα, the pulse height is 5.5 μA and decay time (τeff) is 90 μs. The maximum count rate (1/20 τeff) is estimated at about 500 cps.