Pub Date : 2023-04-02DOI: 10.1080/08957959.2023.2195110
Hsiuming Liu, S. Ueno, T. Araki
ABSTRACT Green tea catechins can improve human health, and their retention during processing is a concern. High hydrostatic pressure (HHP) blanching is a nonthermal processing that can increase both nutrients and flavor in tea. Thermal blanching retains catechins but decreases nutrients and flavor. We investigated catechin retention potency via HHP and thermal treatment. Fresh green tea leaves were pressurized at 100–800 MPa and/or heated for 10 min at 40°C–70°C and then stored for 24 hours. Tea catechin content was drastically reduced after storage without HHP, which yielded a 1.5–8.0-fold increase. HHP showed a smiling curve relationship with catechin retention, with the highest levels found at 200 and 800 MPa. Synergistic effects of HHP on thermal processing were found at 40°C–50°C but not at 60°C–80°C. Processing at 200 MPa combined with 50°C yielded 88% catechin retention. Our results suggest this combination as an optimal strategy for retaining tea catechins, nutrients, and flavor.
{"title":"Effect of high-hydrostatic-pressure processing on catechin content in green tea leaves","authors":"Hsiuming Liu, S. Ueno, T. Araki","doi":"10.1080/08957959.2023.2195110","DOIUrl":"https://doi.org/10.1080/08957959.2023.2195110","url":null,"abstract":"ABSTRACT Green tea catechins can improve human health, and their retention during processing is a concern. High hydrostatic pressure (HHP) blanching is a nonthermal processing that can increase both nutrients and flavor in tea. Thermal blanching retains catechins but decreases nutrients and flavor. We investigated catechin retention potency via HHP and thermal treatment. Fresh green tea leaves were pressurized at 100–800 MPa and/or heated for 10 min at 40°C–70°C and then stored for 24 hours. Tea catechin content was drastically reduced after storage without HHP, which yielded a 1.5–8.0-fold increase. HHP showed a smiling curve relationship with catechin retention, with the highest levels found at 200 and 800 MPa. Synergistic effects of HHP on thermal processing were found at 40°C–50°C but not at 60°C–80°C. Processing at 200 MPa combined with 50°C yielded 88% catechin retention. Our results suggest this combination as an optimal strategy for retaining tea catechins, nutrients, and flavor.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46578943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.1080/08957959.2023.2195109
Ming Gao, Kazuki Nomura, Y. Ando, Yoshiko Nakaura, Zhenya Zhang, Kazutaka Yamamoto
ABSTRACT Carrot was impregnated with pigment solution by vacuum heat sealing (VS) and/or high hydrostatic pressure treatment (HHP; 100–600 MPa, 25°C, 5 min). Impregnation efficacy was evaluated as impregnation ratio (%) by image analysis, while damages of cell membrane and texture were quantified by electrical impedance spectroscopy and texture analysis, respectively. Combinations of VS and HHP exclusively achieved 100% impregnation. Meanwhile, the damages were comparable between the samples after VS and VS + 100 MPa treatment and aggravated by elevated levels of HHP. As for the texture, breaking stress (hardness) decreased after VS and VS + HHP (100–600 MPa) comparably. Meanwhile, breaking strain (deformability) significantly increased after VS + HHP (200–600 MPa), indicating further damage of strain texture as compared with that after VS and VS + 100 MPa treatments. It was indicated that impregnation of carrot was fully achieved by a combination of VS and 100 MPa treatment, while minimizing the cell membrane and texture damages. Difference in the impregnation efficacy between carrot and apple was discussed based on their image data.
{"title":"Vacuum impregnation of liquid into carrot assisted by high hydrostatic pressure","authors":"Ming Gao, Kazuki Nomura, Y. Ando, Yoshiko Nakaura, Zhenya Zhang, Kazutaka Yamamoto","doi":"10.1080/08957959.2023.2195109","DOIUrl":"https://doi.org/10.1080/08957959.2023.2195109","url":null,"abstract":"ABSTRACT Carrot was impregnated with pigment solution by vacuum heat sealing (VS) and/or high hydrostatic pressure treatment (HHP; 100–600 MPa, 25°C, 5 min). Impregnation efficacy was evaluated as impregnation ratio (%) by image analysis, while damages of cell membrane and texture were quantified by electrical impedance spectroscopy and texture analysis, respectively. Combinations of VS and HHP exclusively achieved 100% impregnation. Meanwhile, the damages were comparable between the samples after VS and VS + 100 MPa treatment and aggravated by elevated levels of HHP. As for the texture, breaking stress (hardness) decreased after VS and VS + HHP (100–600 MPa) comparably. Meanwhile, breaking strain (deformability) significantly increased after VS + HHP (200–600 MPa), indicating further damage of strain texture as compared with that after VS and VS + 100 MPa treatments. It was indicated that impregnation of carrot was fully achieved by a combination of VS and 100 MPa treatment, while minimizing the cell membrane and texture damages. Difference in the impregnation efficacy between carrot and apple was discussed based on their image data.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44030109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-03DOI: 10.1080/08957959.2023.2184265
Maricarmen Íñiguez-Moreno, G. Ascanio, M. Calderón‐Santoyo, E. Brito-Bazán, E. Brito-de la Fuente, J. A. Ragazzo‐Sánchez
ABSTRACT A predictive model based on the Box–Behnken design was developed to determine the effect of high hydrostatic pressure (HHP), temperature, and cycles (each holding time of 10 min) on the inactivation of Aspergillus niger spores and in the droplet size of a model emulsion. The obtained model presented goodness of fit to the data with a high correlation coefficient (R2 = 0.91) and adjusted correlation coefficient value ( 0.88), with no significant lack-of-fit test (p = 0.6031). The canonical analysis provides the conditions (37.29 °C, 263.33 MPa, and, 1.88 cycles) to reduce 5.0 Log10 CFU/mL of A. nigger. Under such conditions, emulsions exhibited a monomodal distribution of droplet size. However, as temperature and pressure increased, both the PDI, D3,2, and D4,3 values increased (p ≤ 0.05). In conclusion, the proposed model has the potential to predict the reduction of A. niger spores by HHP without causing emulsion destabilization.
{"title":"Modeling the inactivation of Aspergillus niger spores in a model parenteral emulsion by high hydrostatic pressure and its effect on the emulsion droplet size","authors":"Maricarmen Íñiguez-Moreno, G. Ascanio, M. Calderón‐Santoyo, E. Brito-Bazán, E. Brito-de la Fuente, J. A. Ragazzo‐Sánchez","doi":"10.1080/08957959.2023.2184265","DOIUrl":"https://doi.org/10.1080/08957959.2023.2184265","url":null,"abstract":"ABSTRACT A predictive model based on the Box–Behnken design was developed to determine the effect of high hydrostatic pressure (HHP), temperature, and cycles (each holding time of 10 min) on the inactivation of Aspergillus niger spores and in the droplet size of a model emulsion. The obtained model presented goodness of fit to the data with a high correlation coefficient (R2 = 0.91) and adjusted correlation coefficient value ( 0.88), with no significant lack-of-fit test (p = 0.6031). The canonical analysis provides the conditions (37.29 °C, 263.33 MPa, and, 1.88 cycles) to reduce 5.0 Log10 CFU/mL of A. nigger. Under such conditions, emulsions exhibited a monomodal distribution of droplet size. However, as temperature and pressure increased, both the PDI, D3,2, and D4,3 values increased (p ≤ 0.05). In conclusion, the proposed model has the potential to predict the reduction of A. niger spores by HHP without causing emulsion destabilization.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45656232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/08957959.2023.2194022
Muhammad Sabeeh Akram, Zhuo-Ning Fan, Fu-sheng Liu
ABSTRACT We report the equation of state and optical properties of shock-compressed liquid nitrogen (LN2) by using a two-stage light-gas gun at pressure up to 29 GPa. Laser velocimetry measurements were used to investigate the transparency and refractive index of shocked LN2 as a function of density. As the density increased with increasing pressure and temperature (13–25 GPa), the refractive index increased up to 27% of pre-shot index of LN2. Evidently, such extreme conditions had no major influence on molecules, and no such dissociation was observed up to 25 GPa. The polarizability slightly decreased and thus supported the existence of intact diatomic molecular nitrogen. At 29 GPa, shocked LN2 dissociated, showing that it probably changed to a highly reflecting fluid. Altogether, these experiments showed how the density affects the refractive index without any change in chemical bonding and allocates the condition at which the temperature-driven dissociation takes place.
{"title":"Refractive index of shock-compressed liquid nitrogen up to 29 GPa","authors":"Muhammad Sabeeh Akram, Zhuo-Ning Fan, Fu-sheng Liu","doi":"10.1080/08957959.2023.2194022","DOIUrl":"https://doi.org/10.1080/08957959.2023.2194022","url":null,"abstract":"ABSTRACT\u0000 We report the equation of state and optical properties of shock-compressed liquid nitrogen (LN2) by using a two-stage light-gas gun at pressure up to 29 GPa. Laser velocimetry measurements were used to investigate the transparency and refractive index of shocked LN2 as a function of density. As the density increased with increasing pressure and temperature (13–25 GPa), the refractive index increased up to 27% of pre-shot index of LN2. Evidently, such extreme conditions had no major influence on molecules, and no such dissociation was observed up to 25 GPa. The polarizability slightly decreased and thus supported the existence of intact diatomic molecular nitrogen. At 29 GPa, shocked LN2 dissociated, showing that it probably changed to a highly reflecting fluid. Altogether, these experiments showed how the density affects the refractive index without any change in chemical bonding and allocates the condition at which the temperature-driven dissociation takes place.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47714950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/08957959.2023.2187294
J. D. McHardy, C. Storm, M. Duff, S. Macleod, M. McMahon
ABSTRACT Dioptas is a widely used software package for integrating and analysing 2-dimensional diffraction images. To help interpret the integrated diffraction profiles it produces, Dioptas users can input files that parameterise a material's thermal equation of state (EoS), enabling the positions of the Bragg peaks from that material to be calculated as a function of pressure and temperature. However, care is needed to ensure that these input files correctly describe the thermal EoS of interest. Here we describe the thermal EoS model used by Dioptas and show how existing thermal EoS should be reparameterised so as to be used correctly in Dioptas. Input EoS files suitable for use with Dioptas are provided for the following commonly-used pressure calibrants and pressure transmitting media: Al, Au, Cu, Mo, Nb, Pt, Ta, hcp-Fe, MgO, NaCl-B1, NaCl-B2, KCl-B2, and Ne.
{"title":"On the creation of thermal equations of state for use in Dioptas","authors":"J. D. McHardy, C. Storm, M. Duff, S. Macleod, M. McMahon","doi":"10.1080/08957959.2023.2187294","DOIUrl":"https://doi.org/10.1080/08957959.2023.2187294","url":null,"abstract":"ABSTRACT Dioptas is a widely used software package for integrating and analysing 2-dimensional diffraction images. To help interpret the integrated diffraction profiles it produces, Dioptas users can input files that parameterise a material's thermal equation of state (EoS), enabling the positions of the Bragg peaks from that material to be calculated as a function of pressure and temperature. However, care is needed to ensure that these input files correctly describe the thermal EoS of interest. Here we describe the thermal EoS model used by Dioptas and show how existing thermal EoS should be reparameterised so as to be used correctly in Dioptas. Input EoS files suitable for use with Dioptas are provided for the following commonly-used pressure calibrants and pressure transmitting media: Al, Au, Cu, Mo, Nb, Pt, Ta, hcp-Fe, MgO, NaCl-B1, NaCl-B2, KCl-B2, and Ne.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46266211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/08957959.2023.2193892
Akira Hasegawa, K. Ohta, T. Yagi, Kei Hirose
ABSTRACT We have measured the thermal diffusivity and conductivity of platinum and MgO periclase at high pressures (P) and high temperatures (T) by combining the pulsed light heating thermoreflectance technique with a laser-heated diamond anvil cell. The obtained thermal conductivity of platinum shows positive pressure and temperature dependences, reaching about 210 W/m/K at the highest P–T condition of 125 GPa and 1850 K. The thermal conductivity of periclase was determined up to 140 GPa and 1950 K, corresponding to the Earth's lowermost mantle, where the conductivity was about 90 W/m/K. Our measurements allow us to test models for the combined P–T dependence of the thermal conductivity of both metals and insulating materials up to Mbar pressures and thousands of kelvins.
{"title":"Thermal conductivity of platinum and periclase under extreme conditions of pressure and temperature","authors":"Akira Hasegawa, K. Ohta, T. Yagi, Kei Hirose","doi":"10.1080/08957959.2023.2193892","DOIUrl":"https://doi.org/10.1080/08957959.2023.2193892","url":null,"abstract":"ABSTRACT We have measured the thermal diffusivity and conductivity of platinum and MgO periclase at high pressures (P) and high temperatures (T) by combining the pulsed light heating thermoreflectance technique with a laser-heated diamond anvil cell. The obtained thermal conductivity of platinum shows positive pressure and temperature dependences, reaching about 210 W/m/K at the highest P–T condition of 125 GPa and 1850 K. The thermal conductivity of periclase was determined up to 140 GPa and 1950 K, corresponding to the Earth's lowermost mantle, where the conductivity was about 90 W/m/K. Our measurements allow us to test models for the combined P–T dependence of the thermal conductivity of both metals and insulating materials up to Mbar pressures and thousands of kelvins.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44989365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/08957959.2023.2171792
J. Kamarád, J. Kaštil, M. Míšek, Z. Arnold
ABSTRACT A versatile type of non-magnetic uniaxial pressure cell has been designed for magnetic measurements in SQUID magnetometer. An advanced technology of machining of miniature parts of the cell was used to make new type of an internal squeezer module, where a sample can be compressed by force up to 3 kN in direction perpendicular to external magnetic field. A correct operation of the cell was tested by study of magnetic behaviour of the Heusler off-stoichiometric Ni2MnSn alloy under uniaxial compression. An unexpected significant difference between reversible effects of uniaxial compression on magnetization of the austenite and martensite phases of the alloy is discussed. The uniaxial compression effects are compared with the effects of hydrostatic pressure on a coupling between magnetization and structural transformation of the alloy.
{"title":"New uniaxial pressure cell used in a study of magnetization of the Heusler Ni2MnSn-based alloy","authors":"J. Kamarád, J. Kaštil, M. Míšek, Z. Arnold","doi":"10.1080/08957959.2023.2171792","DOIUrl":"https://doi.org/10.1080/08957959.2023.2171792","url":null,"abstract":"ABSTRACT A versatile type of non-magnetic uniaxial pressure cell has been designed for magnetic measurements in SQUID magnetometer. An advanced technology of machining of miniature parts of the cell was used to make new type of an internal squeezer module, where a sample can be compressed by force up to 3 kN in direction perpendicular to external magnetic field. A correct operation of the cell was tested by study of magnetic behaviour of the Heusler off-stoichiometric Ni2MnSn alloy under uniaxial compression. An unexpected significant difference between reversible effects of uniaxial compression on magnetization of the austenite and martensite phases of the alloy is discussed. The uniaxial compression effects are compared with the effects of hydrostatic pressure on a coupling between magnetization and structural transformation of the alloy.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43870689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/08957959.2023.2191195
L. Xiong, Lujun Huang, Dujin Liu, Yingchun Ding, Junran Zhang
ABSTRACT In this study, synchrotron radiation X-ray diffraction is used to study the equation of state of vanadium nitride in a diamond anvil cell at room temperature. Experimental results reveal the high stability of the cubic structure up to 76 GPa pressure. In addition, the bulk modulus of vanadium nitride derived from XRD data is K 0 = 328.4(2.8) GPa with K 0′ = 5.86(0.14). Finally, the high pressure compression behavior is investigated to 80 GPa using density functional theory of first-principle calculations, and the obtained bulk elastic modulus is 316 GPa. Vanadium nitride is not magnetic in the whole pressure range and is metallic. Highlights • We have investigated the equation of state of VN under high pressure with silicone oil as the pressure transmitting medium to 76 GPa. • It was found that the face-centred cubic structure of VN maintains the maximum pressure of 76 GPa. • We have carried out first-principles calculations and obtained the equation of state, band structure, and electronic density of state of VN to 80 GPa.
{"title":"Effect of pressure of vanadium nitride using XRD and DFT","authors":"L. Xiong, Lujun Huang, Dujin Liu, Yingchun Ding, Junran Zhang","doi":"10.1080/08957959.2023.2191195","DOIUrl":"https://doi.org/10.1080/08957959.2023.2191195","url":null,"abstract":"ABSTRACT In this study, synchrotron radiation X-ray diffraction is used to study the equation of state of vanadium nitride in a diamond anvil cell at room temperature. Experimental results reveal the high stability of the cubic structure up to 76 GPa pressure. In addition, the bulk modulus of vanadium nitride derived from XRD data is K 0 = 328.4(2.8) GPa with K 0′ = 5.86(0.14). Finally, the high pressure compression behavior is investigated to 80 GPa using density functional theory of first-principle calculations, and the obtained bulk elastic modulus is 316 GPa. Vanadium nitride is not magnetic in the whole pressure range and is metallic. Highlights • We have investigated the equation of state of VN under high pressure with silicone oil as the pressure transmitting medium to 76 GPa. • It was found that the face-centred cubic structure of VN maintains the maximum pressure of 76 GPa. • We have carried out first-principles calculations and obtained the equation of state, band structure, and electronic density of state of VN to 80 GPa.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47405521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-02DOI: 10.1080/08957959.2023.2182209
R. Hrubiak, B. Sturtevant
ABSTRACT Sound speed and elastic constants measurements in solids and liquids are commonly performed using the ultrasound pulse-echo technique. Recent advances have expanded the use of this technique at numerous high pressure synchrotron beamlines and offline laboratories. However, the increased experimental throughput has revealed many limitations in existing software for handling the rapid measurement and the subsequent data-reduction. We report the development of a collection of computer programs for sound speed measurements using the ultrasound pulse-echo technique, compatible with stepped multi-frequency, as well as broadband-pulse, couplant-corrected methods. The programs provide a highly interactive graphical interface, enable efficient measurement, exploration and near real-time analysis of the ultrasound data, and contain features useful for working with samples under high pressure and/or high temperature. The included analysis programs can alleviate the time required for data reduction from hours to less than a minute, allowing users to make timely and informed decisions regarding the appropriate experimental parameters.
{"title":"SonicPy: a suite of programs for ultrasound pulse-echo data acquisition and analysis","authors":"R. Hrubiak, B. Sturtevant","doi":"10.1080/08957959.2023.2182209","DOIUrl":"https://doi.org/10.1080/08957959.2023.2182209","url":null,"abstract":"ABSTRACT Sound speed and elastic constants measurements in solids and liquids are commonly performed using the ultrasound pulse-echo technique. Recent advances have expanded the use of this technique at numerous high pressure synchrotron beamlines and offline laboratories. However, the increased experimental throughput has revealed many limitations in existing software for handling the rapid measurement and the subsequent data-reduction. We report the development of a collection of computer programs for sound speed measurements using the ultrasound pulse-echo technique, compatible with stepped multi-frequency, as well as broadband-pulse, couplant-corrected methods. The programs provide a highly interactive graphical interface, enable efficient measurement, exploration and near real-time analysis of the ultrasound data, and contain features useful for working with samples under high pressure and/or high temperature. The included analysis programs can alleviate the time required for data reduction from hours to less than a minute, allowing users to make timely and informed decisions regarding the appropriate experimental parameters.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2023-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47138281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-27DOI: 10.1080/08957959.2022.2160246
L. Yang, A. Karandikar, T. Shiell, B. A. Cook, S. Wong, M. Field, J. Bradby, B. Haberl, D. G. McCulloch, R. Boehler
ABSTRACT The phase behavior of carbon at high pressure and the search for carbon structures denser than diamond has been explored for decades showing large discrepancies, with many fundamental questions remaining unresolved. Here we show evidence of melting above the graphite-diamond-liquid (GDL) triple point (∼13 GPa, 4000 K) up to 50 GPa on samples recovered from single flash-heating events using spectroscopic and electron microscopic methods. The results show that for all pressures, diamond melts below the triple point temperature contradicting previous studies, most of which predict a positive slope of the melting curve.
{"title":"Melting diamond in the diamond cell by laser-flash heating","authors":"L. Yang, A. Karandikar, T. Shiell, B. A. Cook, S. Wong, M. Field, J. Bradby, B. Haberl, D. G. McCulloch, R. Boehler","doi":"10.1080/08957959.2022.2160246","DOIUrl":"https://doi.org/10.1080/08957959.2022.2160246","url":null,"abstract":"ABSTRACT The phase behavior of carbon at high pressure and the search for carbon structures denser than diamond has been explored for decades showing large discrepancies, with many fundamental questions remaining unresolved. Here we show evidence of melting above the graphite-diamond-liquid (GDL) triple point (∼13 GPa, 4000 K) up to 50 GPa on samples recovered from single flash-heating events using spectroscopic and electron microscopic methods. The results show that for all pressures, diamond melts below the triple point temperature contradicting previous studies, most of which predict a positive slope of the melting curve.","PeriodicalId":12864,"journal":{"name":"High Pressure Research","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44782869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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