利用硬脂酸钠(NaSt)和油酸钠(NaOL)对文石型和方解石型两种CaCO_(3)粉体进行表面改性,将改性的CaCO_(3)粉体与聚二甲基硅氧烷(PDMS)共混,喷涂得到了CaCO_(3)/PDMS基超疏水涂层。采用XRD、SEM、接触角测量仪对改性CaCO_(3)粉体及超疏水...利用硬脂酸钠(NaSt)和油酸钠(NaOL)对文石型和方解石型两种CaCO_(3)粉体进行表面改性,将改性的CaCO_(3)粉体与聚二甲基硅氧烷(PDMS)共混,喷涂得到了CaCO_(3)/PDMS基超疏水涂层。采用XRD、SEM、接触角测量仪对改性CaCO_(3)粉体及超疏水涂层进行测试,考察了不同晶型CaCO_(3)用量对涂层疏水性能的影响,并对超疏水涂层的自清洁性及稳定性进行了评价。结果表明,当NaSt和NaOL用量分别为反应体系CaCO_(3)理论生成质量的5%时,CaCO_(3)粉体改性效果最好,所制备的CaCO_(3)/PDMS涂层疏水性最佳。当CaCO_(3)和PDMS质量比为1.5∶1时,CaCO_(3)/PDMS涂层接触角>150°,具有超疏水性。玻璃板涂层表面的亚甲基蓝污染物可以完全随着液滴被冲走,没有残留,且经过500 m L流速5 m/s的水流冲击,接触角仍达140°以上。展开更多
The kagome metals AV_(3)Sb_(5)(A=K,Rb,Cs)under ambient pressure exhibit an unusual charge order,from which superconductivity emerges.In this work,by applying hydrostatic pressure using a liquid pressure medium and car...The kagome metals AV_(3)Sb_(5)(A=K,Rb,Cs)under ambient pressure exhibit an unusual charge order,from which superconductivity emerges.In this work,by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV_(3)Sb_(5),we find that the charge order becomes suppressed under a modest pressure pc(1.4 GPa<pc<1.6 GPa),while the superconducting transition temperature Tc is maximized.Tc is then gradually weakened with further increase of pressure and reaches a minimum around 14.3 GPa,before exhibiting another{maximum}around 22.8 GPa,signifying the presence of a second superconducting dome.Distinct normal state resistance anomalies are found to be associated with the second superconducting dome,similar to KV_(3)Sb_(5).Our findings point to qualitatively similar temperature-pressure phase diagrams in KV_(3)Sb_(5) and RbV_(3)Sb_(5),{and suggest a close link}between the second superconducting dome and the high-pressure resistance anomalies.展开更多
The heavy fermion ferromagnet CeRh_(6)Ge_(4)is the first example of a clean stoichiometric system where the ferromagnetic transition can be continuously suppressed by hydrostatic pressure to a quantum critical point.I...The heavy fermion ferromagnet CeRh_(6)Ge_(4)is the first example of a clean stoichiometric system where the ferromagnetic transition can be continuously suppressed by hydrostatic pressure to a quantum critical point.In order to reveal the outcome when the magnetic lattice of CeRh_(6)Ge_(4)is diluted with non-magnetic atoms,this study reports comprehensive measurements of the physical properties of both single crystal and polycrystalline samples of La_(x)Ce_(1-x)Rh_(6)Ge_(4).With increasing x,the Curie temperature decreases,and no transition is observed for x>0.25,while the system evolves from exhibiting coherent Kondo lattice behaviors at low x to the Kondo impurity scenario at large x.Moreover,non-Fermi liquid behavior is observed over a wide doping range,which agrees well with the disordered Kondo model for 0.52≤x≤0.66,while strange metal behavior is revealed in the vicinity of x_(c)=0.26.展开更多
文摘利用硬脂酸钠(NaSt)和油酸钠(NaOL)对文石型和方解石型两种CaCO_(3)粉体进行表面改性,将改性的CaCO_(3)粉体与聚二甲基硅氧烷(PDMS)共混,喷涂得到了CaCO_(3)/PDMS基超疏水涂层。采用XRD、SEM、接触角测量仪对改性CaCO_(3)粉体及超疏水涂层进行测试,考察了不同晶型CaCO_(3)用量对涂层疏水性能的影响,并对超疏水涂层的自清洁性及稳定性进行了评价。结果表明,当NaSt和NaOL用量分别为反应体系CaCO_(3)理论生成质量的5%时,CaCO_(3)粉体改性效果最好,所制备的CaCO_(3)/PDMS涂层疏水性最佳。当CaCO_(3)和PDMS质量比为1.5∶1时,CaCO_(3)/PDMS涂层接触角>150°,具有超疏水性。玻璃板涂层表面的亚甲基蓝污染物可以完全随着液滴被冲走,没有残留,且经过500 m L流速5 m/s的水流冲击,接触角仍达140°以上。
基金the National Key R&D Program of China(Grant Nos.2017YFA0303100 and 2016YFA0300202)the Key R&D Program of Zhejiang Province,China(Grant No.2021C01002)+3 种基金the National Natural Science Foundation of China(Grant Nos.11974306 and 12034017)the Fundamental Research Funds for the Central Universities of Chinasupport via the UC Santa Barbara NSF Quantum Foundry funded via the Q-AMASE-i program under award DMR-1906325support from the California Nano Systems Institute through the Elings fellowship program。
文摘The kagome metals AV_(3)Sb_(5)(A=K,Rb,Cs)under ambient pressure exhibit an unusual charge order,from which superconductivity emerges.In this work,by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV_(3)Sb_(5),we find that the charge order becomes suppressed under a modest pressure pc(1.4 GPa<pc<1.6 GPa),while the superconducting transition temperature Tc is maximized.Tc is then gradually weakened with further increase of pressure and reaches a minimum around 14.3 GPa,before exhibiting another{maximum}around 22.8 GPa,signifying the presence of a second superconducting dome.Distinct normal state resistance anomalies are found to be associated with the second superconducting dome,similar to KV_(3)Sb_(5).Our findings point to qualitatively similar temperature-pressure phase diagrams in KV_(3)Sb_(5) and RbV_(3)Sb_(5),{and suggest a close link}between the second superconducting dome and the high-pressure resistance anomalies.
基金the National Natural Science Foundation of China(Grant Nos.12034017 and 11974306)the National Key R&D Program of China(Grant Nos.2017YFA0303100 and 2016YFA0300202)+1 种基金the Key R&D Program of Zhejiang ProvinceChina(Grant No.2021C01002)。
文摘The heavy fermion ferromagnet CeRh_(6)Ge_(4)is the first example of a clean stoichiometric system where the ferromagnetic transition can be continuously suppressed by hydrostatic pressure to a quantum critical point.In order to reveal the outcome when the magnetic lattice of CeRh_(6)Ge_(4)is diluted with non-magnetic atoms,this study reports comprehensive measurements of the physical properties of both single crystal and polycrystalline samples of La_(x)Ce_(1-x)Rh_(6)Ge_(4).With increasing x,the Curie temperature decreases,and no transition is observed for x>0.25,while the system evolves from exhibiting coherent Kondo lattice behaviors at low x to the Kondo impurity scenario at large x.Moreover,non-Fermi liquid behavior is observed over a wide doping range,which agrees well with the disordered Kondo model for 0.52≤x≤0.66,while strange metal behavior is revealed in the vicinity of x_(c)=0.26.
基金supported by the Key R&D Program of Zhejiang Province,China(2021C01002)the National Natural Science Foundation of China(11874320,12034017,11874137,and 11974306)+1 种基金the National Key R&D Program of China(2017YFA0303100)Zhejiang Provincial Natural Science Foundation of China(R22A0410240).
