The Experts below are selected from a list of 130269 Experts worldwide ranked by ideXlab platform
Junhua Luo - One of the best experts on this subject based on the ideXlab platform.
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Triethylammonium picrate: An above-room-temperature phase transition material to switch quadratic nonlinear optical properties
2018Co-Authors: Muhammad Adnan Asghar, Zhihua Sun, Aurang Zeb, Jing Zhang, Shiguo Han, Junhua LuoAbstract:Abstract To switch quadratic nonlinear optical (NLO) effects has become an exciting branch of the NLO material science. However, solid-state molecular crystals showing tunable and switchable NLO behaviors remain scarce. Here, we report an organic picrate-based binary molecular crystal, triethylammonium picrate (TEAP), which undergoes an above-room-temperature phase transition at Tc = 319 K, being solidly confirmed by the thermal and dielectric measurements. A large thermal hysteresis of ∼7 K discloses the first-order feature for its phase transition. More strikingly, the quadratic NLO effects of TEAP can be switched in the vicinity of Tc. That is, TEAP exhibits NLO-active response of ∼1.5 times as large as that of KDP below Tc (i.e., NLO-on state), while its NLO effects totally disappear above Tc (NLO-off state). Structure analyses disclose that the Order-Disorder Transformations of triethylammonium cations and picrate anions collectively contribute to its phase transition, as well as switchable NLO behaviors. This work opens up a new pathway to the designing and assembling of stimuli-responsive materials.
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reversible phase transition driven by order disorder Transformations of metal halide moieties in c6h14 nh2 2 cubr4
2016Co-Authors: Muhammad Adnan Asghar, Zhihua Sun, Shuquan Zhang, Aurang Zeb, Sangen Zhao, Tariq Khan, Junhua LuoAbstract:A novel phase transition has been discovered where the phase transition is primarily accomplished by the order–disorder transformation of metal-coordinated halogen atoms in an organic–inorganic hybrid material [(C6H14)NH2]2·CuBr4 (1). Its phase transition behaviour was verified by specific heat capacity (Cp) and differential scanning calorimetry (DSC) measurements with a thermal hysteresis at 4.8 K. The dielectric measurements of 1 show a distinct step-like anomaly around Tc, demonstrating two states at two different phases, which enlightens that 1 can be conceived as a potential switchable dielectric material. Moreover, temperature-dependent single-crystal X-ray diffraction analyses of 1 disclose that disordering of metal-halides together with reorientations of the cations is the cause of this unique phase-transition material. All these results open a new way to design and assemble novel phase transition materials.
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reversible phase transition triggered by order disorder Transformations and distortions in dipropylammonium d 10 camphorsulfonate
2016Co-Authors: Yuelan Zhou, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Cheng Song, Junhua LuoAbstract:Dipropylammonium D-(+)-10-camphorsulfonate (compound 1) was constructed from a mono-component rotator–stator type dipropylammonium cation and D-(+)-10-camphorsulfonate anion and undergoes a phase transition at 205 K. Differential scanning calorimetry curves of 1 present a pair of peaks, which indicate reversible and first-order phase transition characters. Continuous changes in the dielectric constants, but with a slight anomaly near the phase transition point further confirm the occurrence of a phase transition. Single crystal X-ray diffractions illustrate that 1 crystallizes in the polar space group P21 at 130 K and 293 K. Closer inspections reveal that the partially disorder–order Transformations of one propyl group in the dipropylammonium cation, as well as a distinct distortion of the terminal ethyl group, induced the structural phase transition. We believe that all these findings would spur the exploration of new structural phase transition compounds.
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switchable dielectric behaviour associated with above room temperature phase transition in n isopropylbenzylammonium dichloroacetate n ipbadc
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Pan Zhou, Junhua LuoAbstract:A bulk transparent single-crystal of N-isopropylbenzylammonium dichloroacetate (N-IPBADC) with sizes of 15 × 15 × 10 mm3, which possesses switchable dielectric permittivities above room temperature, has been successfully grown by the slow solution cooling method. A reversible second-order solid-state phase transition at 366 K was confirmed by thermal analyses, including differential scanning calorimetry (DSC) and specific heat (Cp), dielectric measurements, variable-temperature single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). In particular, order–disorder Transformations of the dichloroacetate moieties in N-IPBADC from room temperature to high temperature phases have been revealed to induce the distinct dielectric anomaly along with dielectric anisotropic properties above room temperature, up to 366 K. The successful discovery of N-IPBADC would potentially pave a new way to explore new above room-temperature phase transition materials.
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phase transition originating from order disorder Transformations of carboxy oxygen atoms coupled with dynamic proton motions in phch2nh ch3 2 2c2o4 h2c2o4
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Junhua LuoAbstract:A new molecular phase transition material, [PhCH(2) NH(CH(3))(2)](2) C(2)O(4)⋅H(2)C(2)O(4), which undergoes a reversible phase transition at 151.6 K, has been successfully synthesized. Differential scanning calorimetry (DSC), specific heat capacity, and dielectric measurements confirm its reversible phase transition with a large thermal hysteresis of 15.1 K, demonstrating that the phase transition is typical first order. Variable-temperature single-crystal X-ray diffraction analyses reveal that the Order-Disorder Transformations of carboxy oxygen atoms induce the structural phase transition. A slight reorientation of the oxalic acid unit is discovered to accompany the ordering of carboxy oxygen atoms at low temperature. The DSC measurement result of the deuterated analog is different to that of 1, indicating that proton dynamic motions in hydrogen bonds also contribute to the phase transition.
Zhihua Sun - One of the best experts on this subject based on the ideXlab platform.
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Triethylammonium picrate: An above-room-temperature phase transition material to switch quadratic nonlinear optical properties
2018Co-Authors: Muhammad Adnan Asghar, Zhihua Sun, Aurang Zeb, Jing Zhang, Shiguo Han, Junhua LuoAbstract:Abstract To switch quadratic nonlinear optical (NLO) effects has become an exciting branch of the NLO material science. However, solid-state molecular crystals showing tunable and switchable NLO behaviors remain scarce. Here, we report an organic picrate-based binary molecular crystal, triethylammonium picrate (TEAP), which undergoes an above-room-temperature phase transition at Tc = 319 K, being solidly confirmed by the thermal and dielectric measurements. A large thermal hysteresis of ∼7 K discloses the first-order feature for its phase transition. More strikingly, the quadratic NLO effects of TEAP can be switched in the vicinity of Tc. That is, TEAP exhibits NLO-active response of ∼1.5 times as large as that of KDP below Tc (i.e., NLO-on state), while its NLO effects totally disappear above Tc (NLO-off state). Structure analyses disclose that the Order-Disorder Transformations of triethylammonium cations and picrate anions collectively contribute to its phase transition, as well as switchable NLO behaviors. This work opens up a new pathway to the designing and assembling of stimuli-responsive materials.
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reversible phase transition driven by order disorder Transformations of metal halide moieties in c6h14 nh2 2 cubr4
2016Co-Authors: Muhammad Adnan Asghar, Zhihua Sun, Shuquan Zhang, Aurang Zeb, Sangen Zhao, Tariq Khan, Junhua LuoAbstract:A novel phase transition has been discovered where the phase transition is primarily accomplished by the order–disorder transformation of metal-coordinated halogen atoms in an organic–inorganic hybrid material [(C6H14)NH2]2·CuBr4 (1). Its phase transition behaviour was verified by specific heat capacity (Cp) and differential scanning calorimetry (DSC) measurements with a thermal hysteresis at 4.8 K. The dielectric measurements of 1 show a distinct step-like anomaly around Tc, demonstrating two states at two different phases, which enlightens that 1 can be conceived as a potential switchable dielectric material. Moreover, temperature-dependent single-crystal X-ray diffraction analyses of 1 disclose that disordering of metal-halides together with reorientations of the cations is the cause of this unique phase-transition material. All these results open a new way to design and assemble novel phase transition materials.
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reversible phase transition triggered by order disorder Transformations and distortions in dipropylammonium d 10 camphorsulfonate
2016Co-Authors: Yuelan Zhou, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Cheng Song, Junhua LuoAbstract:Dipropylammonium D-(+)-10-camphorsulfonate (compound 1) was constructed from a mono-component rotator–stator type dipropylammonium cation and D-(+)-10-camphorsulfonate anion and undergoes a phase transition at 205 K. Differential scanning calorimetry curves of 1 present a pair of peaks, which indicate reversible and first-order phase transition characters. Continuous changes in the dielectric constants, but with a slight anomaly near the phase transition point further confirm the occurrence of a phase transition. Single crystal X-ray diffractions illustrate that 1 crystallizes in the polar space group P21 at 130 K and 293 K. Closer inspections reveal that the partially disorder–order Transformations of one propyl group in the dipropylammonium cation, as well as a distinct distortion of the terminal ethyl group, induced the structural phase transition. We believe that all these findings would spur the exploration of new structural phase transition compounds.
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switchable dielectric behaviour associated with above room temperature phase transition in n isopropylbenzylammonium dichloroacetate n ipbadc
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Pan Zhou, Junhua LuoAbstract:A bulk transparent single-crystal of N-isopropylbenzylammonium dichloroacetate (N-IPBADC) with sizes of 15 × 15 × 10 mm3, which possesses switchable dielectric permittivities above room temperature, has been successfully grown by the slow solution cooling method. A reversible second-order solid-state phase transition at 366 K was confirmed by thermal analyses, including differential scanning calorimetry (DSC) and specific heat (Cp), dielectric measurements, variable-temperature single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). In particular, order–disorder Transformations of the dichloroacetate moieties in N-IPBADC from room temperature to high temperature phases have been revealed to induce the distinct dielectric anomaly along with dielectric anisotropic properties above room temperature, up to 366 K. The successful discovery of N-IPBADC would potentially pave a new way to explore new above room-temperature phase transition materials.
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phase transition originating from order disorder Transformations of carboxy oxygen atoms coupled with dynamic proton motions in phch2nh ch3 2 2c2o4 h2c2o4
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Junhua LuoAbstract:A new molecular phase transition material, [PhCH(2) NH(CH(3))(2)](2) C(2)O(4)⋅H(2)C(2)O(4), which undergoes a reversible phase transition at 151.6 K, has been successfully synthesized. Differential scanning calorimetry (DSC), specific heat capacity, and dielectric measurements confirm its reversible phase transition with a large thermal hysteresis of 15.1 K, demonstrating that the phase transition is typical first order. Variable-temperature single-crystal X-ray diffraction analyses reveal that the Order-Disorder Transformations of carboxy oxygen atoms induce the structural phase transition. A slight reorientation of the oxalic acid unit is discovered to accompany the ordering of carboxy oxygen atoms at low temperature. The DSC measurement result of the deuterated analog is different to that of 1, indicating that proton dynamic motions in hydrogen bonds also contribute to the phase transition.
Shuquan Zhang - One of the best experts on this subject based on the ideXlab platform.
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reversible phase transition driven by order disorder Transformations of metal halide moieties in c6h14 nh2 2 cubr4
2016Co-Authors: Muhammad Adnan Asghar, Zhihua Sun, Shuquan Zhang, Aurang Zeb, Sangen Zhao, Tariq Khan, Junhua LuoAbstract:A novel phase transition has been discovered where the phase transition is primarily accomplished by the order–disorder transformation of metal-coordinated halogen atoms in an organic–inorganic hybrid material [(C6H14)NH2]2·CuBr4 (1). Its phase transition behaviour was verified by specific heat capacity (Cp) and differential scanning calorimetry (DSC) measurements with a thermal hysteresis at 4.8 K. The dielectric measurements of 1 show a distinct step-like anomaly around Tc, demonstrating two states at two different phases, which enlightens that 1 can be conceived as a potential switchable dielectric material. Moreover, temperature-dependent single-crystal X-ray diffraction analyses of 1 disclose that disordering of metal-halides together with reorientations of the cations is the cause of this unique phase-transition material. All these results open a new way to design and assemble novel phase transition materials.
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reversible phase transition triggered by order disorder Transformations and distortions in dipropylammonium d 10 camphorsulfonate
2016Co-Authors: Yuelan Zhou, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Cheng Song, Junhua LuoAbstract:Dipropylammonium D-(+)-10-camphorsulfonate (compound 1) was constructed from a mono-component rotator–stator type dipropylammonium cation and D-(+)-10-camphorsulfonate anion and undergoes a phase transition at 205 K. Differential scanning calorimetry curves of 1 present a pair of peaks, which indicate reversible and first-order phase transition characters. Continuous changes in the dielectric constants, but with a slight anomaly near the phase transition point further confirm the occurrence of a phase transition. Single crystal X-ray diffractions illustrate that 1 crystallizes in the polar space group P21 at 130 K and 293 K. Closer inspections reveal that the partially disorder–order Transformations of one propyl group in the dipropylammonium cation, as well as a distinct distortion of the terminal ethyl group, induced the structural phase transition. We believe that all these findings would spur the exploration of new structural phase transition compounds.
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switchable dielectric behaviour associated with above room temperature phase transition in n isopropylbenzylammonium dichloroacetate n ipbadc
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Pan Zhou, Junhua LuoAbstract:A bulk transparent single-crystal of N-isopropylbenzylammonium dichloroacetate (N-IPBADC) with sizes of 15 × 15 × 10 mm3, which possesses switchable dielectric permittivities above room temperature, has been successfully grown by the slow solution cooling method. A reversible second-order solid-state phase transition at 366 K was confirmed by thermal analyses, including differential scanning calorimetry (DSC) and specific heat (Cp), dielectric measurements, variable-temperature single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). In particular, order–disorder Transformations of the dichloroacetate moieties in N-IPBADC from room temperature to high temperature phases have been revealed to induce the distinct dielectric anomaly along with dielectric anisotropic properties above room temperature, up to 366 K. The successful discovery of N-IPBADC would potentially pave a new way to explore new above room-temperature phase transition materials.
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phase transition originating from order disorder Transformations of carboxy oxygen atoms coupled with dynamic proton motions in phch2nh ch3 2 2c2o4 h2c2o4
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Junhua LuoAbstract:A new molecular phase transition material, [PhCH(2) NH(CH(3))(2)](2) C(2)O(4)⋅H(2)C(2)O(4), which undergoes a reversible phase transition at 151.6 K, has been successfully synthesized. Differential scanning calorimetry (DSC), specific heat capacity, and dielectric measurements confirm its reversible phase transition with a large thermal hysteresis of 15.1 K, demonstrating that the phase transition is typical first order. Variable-temperature single-crystal X-ray diffraction analyses reveal that the Order-Disorder Transformations of carboxy oxygen atoms induce the structural phase transition. A slight reorientation of the oxalic acid unit is discovered to accompany the ordering of carboxy oxygen atoms at low temperature. The DSC measurement result of the deuterated analog is different to that of 1, indicating that proton dynamic motions in hydrogen bonds also contribute to the phase transition.
Yuanyuan Tang - One of the best experts on this subject based on the ideXlab platform.
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switchable dielectric behaviour associated with above room temperature phase transition in n isopropylbenzylammonium dichloroacetate n ipbadc
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Pan Zhou, Junhua LuoAbstract:A bulk transparent single-crystal of N-isopropylbenzylammonium dichloroacetate (N-IPBADC) with sizes of 15 × 15 × 10 mm3, which possesses switchable dielectric permittivities above room temperature, has been successfully grown by the slow solution cooling method. A reversible second-order solid-state phase transition at 366 K was confirmed by thermal analyses, including differential scanning calorimetry (DSC) and specific heat (Cp), dielectric measurements, variable-temperature single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). In particular, order–disorder Transformations of the dichloroacetate moieties in N-IPBADC from room temperature to high temperature phases have been revealed to induce the distinct dielectric anomaly along with dielectric anisotropic properties above room temperature, up to 366 K. The successful discovery of N-IPBADC would potentially pave a new way to explore new above room-temperature phase transition materials.
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phase transition originating from order disorder Transformations of carboxy oxygen atoms coupled with dynamic proton motions in phch2nh ch3 2 2c2o4 h2c2o4
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Junhua LuoAbstract:A new molecular phase transition material, [PhCH(2) NH(CH(3))(2)](2) C(2)O(4)⋅H(2)C(2)O(4), which undergoes a reversible phase transition at 151.6 K, has been successfully synthesized. Differential scanning calorimetry (DSC), specific heat capacity, and dielectric measurements confirm its reversible phase transition with a large thermal hysteresis of 15.1 K, demonstrating that the phase transition is typical first order. Variable-temperature single-crystal X-ray diffraction analyses reveal that the Order-Disorder Transformations of carboxy oxygen atoms induce the structural phase transition. A slight reorientation of the oxalic acid unit is discovered to accompany the ordering of carboxy oxygen atoms at low temperature. The DSC measurement result of the deuterated analog is different to that of 1, indicating that proton dynamic motions in hydrogen bonds also contribute to the phase transition.
Tianliang Chen - One of the best experts on this subject based on the ideXlab platform.
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reversible phase transition triggered by order disorder Transformations and distortions in dipropylammonium d 10 camphorsulfonate
2016Co-Authors: Yuelan Zhou, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Cheng Song, Junhua LuoAbstract:Dipropylammonium D-(+)-10-camphorsulfonate (compound 1) was constructed from a mono-component rotator–stator type dipropylammonium cation and D-(+)-10-camphorsulfonate anion and undergoes a phase transition at 205 K. Differential scanning calorimetry curves of 1 present a pair of peaks, which indicate reversible and first-order phase transition characters. Continuous changes in the dielectric constants, but with a slight anomaly near the phase transition point further confirm the occurrence of a phase transition. Single crystal X-ray diffractions illustrate that 1 crystallizes in the polar space group P21 at 130 K and 293 K. Closer inspections reveal that the partially disorder–order Transformations of one propyl group in the dipropylammonium cation, as well as a distinct distortion of the terminal ethyl group, induced the structural phase transition. We believe that all these findings would spur the exploration of new structural phase transition compounds.
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switchable dielectric behaviour associated with above room temperature phase transition in n isopropylbenzylammonium dichloroacetate n ipbadc
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Sangen Zhao, Pan Zhou, Junhua LuoAbstract:A bulk transparent single-crystal of N-isopropylbenzylammonium dichloroacetate (N-IPBADC) with sizes of 15 × 15 × 10 mm3, which possesses switchable dielectric permittivities above room temperature, has been successfully grown by the slow solution cooling method. A reversible second-order solid-state phase transition at 366 K was confirmed by thermal analyses, including differential scanning calorimetry (DSC) and specific heat (Cp), dielectric measurements, variable-temperature single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). In particular, order–disorder Transformations of the dichloroacetate moieties in N-IPBADC from room temperature to high temperature phases have been revealed to induce the distinct dielectric anomaly along with dielectric anisotropic properties above room temperature, up to 366 K. The successful discovery of N-IPBADC would potentially pave a new way to explore new above room-temperature phase transition materials.
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phase transition originating from order disorder Transformations of carboxy oxygen atoms coupled with dynamic proton motions in phch2nh ch3 2 2c2o4 h2c2o4
2014Co-Authors: Yuanyuan Tang, Zhihua Sun, Shuquan Zhang, Tianliang Chen, Junhua LuoAbstract:A new molecular phase transition material, [PhCH(2) NH(CH(3))(2)](2) C(2)O(4)⋅H(2)C(2)O(4), which undergoes a reversible phase transition at 151.6 K, has been successfully synthesized. Differential scanning calorimetry (DSC), specific heat capacity, and dielectric measurements confirm its reversible phase transition with a large thermal hysteresis of 15.1 K, demonstrating that the phase transition is typical first order. Variable-temperature single-crystal X-ray diffraction analyses reveal that the Order-Disorder Transformations of carboxy oxygen atoms induce the structural phase transition. A slight reorientation of the oxalic acid unit is discovered to accompany the ordering of carboxy oxygen atoms at low temperature. The DSC measurement result of the deuterated analog is different to that of 1, indicating that proton dynamic motions in hydrogen bonds also contribute to the phase transition.