Article
Thermodynamics
Xiaotong Xi, Biao Yang, Jue Wang, Liubiao Chen, Junjie Wang
Summary: Helium sorption coolers are a commonly used sub-Kelvin refrigeration technology, with the adsorption characteristics of the porous material having a crucial impact on their performance at low temperatures. This study compared the adsorption characteristics of helium-3 and helium-4, and analyzed their effects on the efficiency and self-cooling loss of the sorption cooler. The results showed that factors such as adsorbed helium in the sorption pump and dead volume gas play a significant role in the condensation efficiency of the sorption coolers.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2021)
Article
Engineering, Chemical
Si-Rui Zhao, Wen-Qiang Huang, Jin-Ku Liu, ZhenXue Liu, JiChang Liu, Yun-Sheng Ma, Peng-Peng Liu
Summary: The unique characteristics of rare earth elements, attributed to their distinctive 4f electron band, have significant potential for enhancing the stability and effectiveness of inorganic anticorrosion materials. In this study, a rod-shaped samarium-doped zinc oxide solid solution (ZSO) material was synthesized under pure inorganic conditions. The protective effect of samarium's 4f electrons on zinc's 3d electrons enhances the chemical stability of the material. Furthermore, the ZSO material can utilize photogenerated electrons to prevent metal corrosion.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Reetendra Singh, Anand Roy, C. N. R. Rao
Summary: Carbon-doped gallium nitride is a promising material for optoelectronic devices, and studying its defects can provide insights into possible transitions. Carbon-doped GaN was obtained through a simple solid-gas reaction. Spectroscopic analysis revealed the presence of an isolated C-N defect state and the formation of a C-N-O-N complex. In heavily doped samples, blue luminescence related to oxygen defects was quenched, and carbon-related yellow luminescence appeared.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
F. J. R. Costa, J. S. de Almeida
Summary: This study investigates the superconductivity in highly doped diamond with acceptor and donor impurities from groups III and V, respectively. Calculations of electron-phonon coupling for different doping elements show that the coupling is strongly related to optical phonons in hole-doped cases, while both optical and acoustic vibrations contribute to high critical temperature estimates in electron-doped systems. The research highlights distinctions between electron- and hole-doped cases, indicating that the mechanism of superconductivity in doped diamond is directly related to the nature of the impurity added to the system.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
N. O. Herashchenko, E. K. Nemchenko, K. E. Nemchenko, T. G. Vikhtinskaya
Summary: Within the framework of the gas-kinetic model, the dissipative properties of He-3-He-4 solid solutions, including diffusion, self-diffusion, and thermal conductivity, are investigated. Experimental observations show dependencies among these properties and the parameters of quasiparticles.
LOW TEMPERATURE PHYSICS
(2022)
Article
Green & Sustainable Science & Technology
Alice do Carmo Precci Lopes, Thomas Senfter, Christian Ebner, Mathias Senn, Martin Pillei, Michael Kraxner, Sabine Robra, Anke Bockreis
Summary: The study aimed to develop a mechanical pretreatment system to separate municipal solid waste (MSW) into a substrate rich in biodegradable material for local valorization. The research results showed that through specific processing steps, the concentration of biodegradable materials can be significantly increased.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Gabriela Hoffman, Mark C. Walkey, John Grasvik, George R. Bacanu, Shamim Alom, Sally Bloodworth, Mark E. Light, Malcolm H. Levitt, Richard J. Whitby
Summary: Researchers have developed a new method to encapsulate gases in fullerenes and trap molecules inside by raising the temperature to complete a reaction, converting the product into C-60 containing endohedral species. This method allows for the synthesis of He-4@C-60, H-2@C-60, and D-2@C-60 in large quantities, as well as the incorporation of expensive gases like HD and He-3 to prepare HD@C-60 and He-3@C-60 efficiently. Additionally, the method enables the synthesis of Ne@C-60 for the first time through molecular surgery, and its characterization using crystallography and C-13 NMR spectroscopy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Chemical
Kazuaki Kanai, Shinji Ozawa, Takahiro Kozawa, Makio Naito
Summary: The synthesis of Li6.25Ga0.25La3Zr2O12 (LLZO-Ga) solid electrolyte powder granules for all solid-state batteries was investigated using mechanical processing with the addition of LiF-BaF2 as a flux. Highly crystalline LLZO-Ga was synthesized without extra-heat assistance, and the addition of 10 mass% LiF-BaF2 during processing at 284 degrees C led to favorable synthesis and granulation of LLZO-Ga powder. The resulting sintered body exhibited high ionic conductivity, suggesting that the formation of LLZO-Ga/BaZrO3 grain boundaries contributed to the enhanced conductivity.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ren-Hao Cheng, Honghao Cai, Yu-Ren Huang, Xiaohong Cui, Zhong Chen, Hsuan-Ying Chen, Shangwu Ding
Summary: Understanding the water state in Nafion is crucial for fuel cell operation and proton transport mechanism elucidation. By designing different types of Nafion samples with substituted cations, preparing samples carefully, and conducting solid state NMR experiments, clear and straightforward information can be obtained to reduce ambiguity in interpreting data. The results show that the type of substituting cation affects the unfrozen water in Nafion, and there is a broad distribution of water state and dynamics as the temperature decreases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Mohammed Zaahid Gaffoor, Alan Lawrence Leigh Jarvis, Jonathan Celvin Archer
Summary: Y1Ba2Cu3O7-delta (YBCO) was doped with thermally stable and unstable graphene oxide (TS-GO and TU-GO), and both doping increased the critical transition temperature (TCmid), with the highest TCmid observed in the 0.7%wt. TU-GO doped sample. XRD analysis showed an increase in the CuO2 planar area with TCmid for TS-GO and TU-GO doping. Magnetic manganese oxide nanoparticles were observed in the doped samples, resulting from impurities in the graphene oxide dopant material. Doping with trimanganese tetraoxide (Mn3O4) and manganese dioxide (MnO2) also increased TCmid, but a higher concentration of Mn3O4 led to a decrease in TCmid.
RESULTS IN PHYSICS
(2023)
Article
Engineering, Mechanical
Evan Gietzen, Soroor Karimi, Nipun Goel, Siamack A. Shirazi, Michael Keller, Todd Otanicar
Summary: Experimental investigation reveals that low particle speeds can reduce solid particle erosion on containment materials in concentrating solar power plants. The erosion of stainless-steel grade 316L is lower at ambient temperature, but significantly increases at high temperature.
Article
Physics, Multidisciplinary
Zhi Gang Cheng, John Beamish
Summary: Helium is an ideal substance for studying quantum liquids and solids due to its purity at low temperatures, but even small concentrations of isotopic impurities can have significant effects. A new sensitive technique combining dielectric and pressure measurements has been developed to resolve concentration changes of isotopic impurities in liquid helium. The migration behavior of He-3 impurities in a coexisting He-4 phase at low temperatures has been observed, highlighting a slower process compared to diffusion in the liquid phase.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Engineering, Environmental
Juntao Gao, Yingying Liu, Yuan Gao, Mengke Yuan, Zhe Wang, Zhe Lu, Qiang Li, Bo Wei
Summary: This study developed cobalt-free fluorine doped Bi0.7Sr0.3FeO3-6 oxides for energetic cathodes of low-temperature solid oxide fuel cells.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Benjamin B. Duff, Stuart J. Elliott, Jacinthe Gamon, Luke M. Daniels, Matthew J. Rosseinsky, Frederic Blanc
Summary: We used nuclear magnetic resonance approaches to determine Li-ion mobility pathways and quantify Li-ion jump rates in Li3AlS3 and Li4.3AlS3.3Cl0.7. In Li3AlS3, there are both mobile and immobile Li ions, with the latter limiting long-range translational ion diffusion. In Li4.3AlS3.3Cl0.7, a single type of fast-moving ion is present, explaining the higher conductivity of this phase.
CHEMISTRY OF MATERIALS
(2023)
Article
Thermodynamics
Shanchen Li, Chenchen Lu, Chao Zhang, Zhihui Li, Junhua Zhao, Jige Chen, Ning Wei
Summary: In this work, a model is proposed to investigate the effect of fluid flow on the thermal boundary conductance between solid and fluid using molecular dynamics simulations. The results show that controlling temperature by excluding velocity components along the flow direction is the best way to eliminate viscous temperature rise. Thermal conduction is insensitive to fluid flow in atomic-smooth channel, but highly dependent on flow velocity in rough channel, where the thermal boundary conductance decreases by 11.7% when flow velocity reaches 18 m/s. These findings reveal the influence of fluid flow on interfacial thermal exchange and provide insights for improving cooling systems based on microfluidics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Physics, Applied
C. Huan, S. S. Kim, D. Candela, N. S. Sullivan
JOURNAL OF LOW TEMPERATURE PHYSICS
(2016)
Article
Physics, Applied
L. Yin, J. S. Xia, C. Huan, N. S. Sullivan, M. H. W. Chan
JOURNAL OF LOW TEMPERATURE PHYSICS
(2011)
Article
Physics, Applied
L. Yin, J. S. Xia, C. Huan, N. S. Sullivan, M. H. W. Chan
JOURNAL OF LOW TEMPERATURE PHYSICS
(2012)
Article
Physics, Applied
N. S. Sullivan, D. Candela, S. S. Kim, C. Huan, L. Yin, J. S. Xia
JOURNAL OF LOW TEMPERATURE PHYSICS
(2014)
Article
Multidisciplinary Sciences
Rong Yu, Liang Yin, Neil S. Sullivan, J. S. Xia, Chao Huan, Armando Paduan-Filho, Nei F. Oliveira, Stephan Haas, Alexander Steppke, Corneliu F. Miclea, Franziska Weickert, Roman Movshovich, Eun-Deok Mun, Brian L. Scott, Vivien S. Zapf, Tommaso Roscilde
Article
Materials Science, Multidisciplinary
Chi Zhang, Chao Huan, J. S. Xia, N. S. Sullivan, W. Pan, K. W. Baldwin, K. W. West, L. N. Pfeiffer, D. C. Tsui
Article
Physics, Applied
C. Huan, J. Adams, M. Lewkowitz, N. Masuhara, D. Candela, N. S. Sullivan
JOURNAL OF LOW TEMPERATURE PHYSICS
(2019)
Article
Physics, Applied
C. Huan, J. Adams, M. Lewkowitz, N. Masuhara, D. Candela, N. S. Sullivan
JOURNAL OF LOW TEMPERATURE PHYSICS
(2020)
Article
Chemistry, Applied
C. Huan, J. A. Hamida, N. S. Sullivan
MICROPOROUS AND MESOPOROUS MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
J. Adams, M. Lewkowitz, C. Huan, N. Masuhara, D. Candela, N. S. Sullivan
Summary: NMR techniques were employed to investigate the dynamics of highly degenerate 3He confined within 4He plated nanotubes of MCM-41. The experiments revealed a linear temperature dependence of nuclear spin-lattice relaxation below the Fermi degeneracy temperature (TF), with a peak at 2TF, indicating the presence of Luttinger liquid physics.
Proceedings Paper
Physics, Applied
C. Huan, N. Masuhara, J. Adams, M. Lewkowitz, N. S. Sullivan
28TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT28)
(2018)
Article
Materials Science, Multidisciplinary
C. Huan, L. Yin, J. S. Xia, D. Candela, B. P. Cowan, N. S. Sullivan
Proceedings Paper
Physics, Applied
D. Candela, C. Huan, S. S. Kim, L. Yin, J. S. Xia, N. S. Sullivan
27TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT27), PTS 1-5
(2014)
Proceedings Paper
Physics, Applied
S. S. Kim, C. Huan, L. Yin, J. S. Xia, N. S. Sullivan, D. Candela
26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5
(2012)
