The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors...The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors, such as electric field strength and particle concentration, were detected. By use of rare earth as agent to dope the samples, the experimental results show that, with the increasing of field strength and particle concentration, ER effect changes.展开更多
Dynamic nuclear polarization(DNP) has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance(NMR) of various molecules.Liquid-state DNP base...Dynamic nuclear polarization(DNP) has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance(NMR) of various molecules.Liquid-state DNP based on Overhauser effect is capable of directly enhancing polarization of all kinds of nuclei in the system.The combination of simultaneous Overhauser multi-nuclei enhancements with the multi-nuclei parallel acquisitions provides a variety of important applications in both MR spectroscopy(MRS) and image(MRI).Here we present two simple illustrative examples for simultaneously enhanced multi-nuclear spectra and images to demonstrate the principle and superiority.We have observed very large simultaneous DNP enhancements for different nuclei,such as ~1H and ^(23)Na,~1H and ^(31)P,^(19)F and ^(31)P,especially for the first time to report sodium ion enhancement in liquid.We have also obtained the simultaneous images of ^(19)H and ^(31)P,^(19)F and ^(31)P at low field by solution-state DNP for the first time.展开更多
文摘The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors, such as electric field strength and particle concentration, were detected. By use of rare earth as agent to dope the samples, the experimental results show that, with the increasing of field strength and particle concentration, ER effect changes.
基金supported by the Chinese Academy of Sciences(ZDYZ2010-2)the Ministry of Science and Technology of China (2011YQ120035)the National Natural Science Foundation of China (11405264,11274347,21221064,11575287)
文摘Dynamic nuclear polarization(DNP) has become a very important hyperpolarization method because it can dramatically increase the sensitivity of nuclear magnetic resonance(NMR) of various molecules.Liquid-state DNP based on Overhauser effect is capable of directly enhancing polarization of all kinds of nuclei in the system.The combination of simultaneous Overhauser multi-nuclei enhancements with the multi-nuclei parallel acquisitions provides a variety of important applications in both MR spectroscopy(MRS) and image(MRI).Here we present two simple illustrative examples for simultaneously enhanced multi-nuclear spectra and images to demonstrate the principle and superiority.We have observed very large simultaneous DNP enhancements for different nuclei,such as ~1H and ^(23)Na,~1H and ^(31)P,^(19)F and ^(31)P,especially for the first time to report sodium ion enhancement in liquid.We have also obtained the simultaneous images of ^(19)H and ^(31)P,^(19)F and ^(31)P at low field by solution-state DNP for the first time.
