A preparative technique to obtain water soluble C_(60)-liposome by means of molecular package of C_(60) with lecithin has been established.The concentration of C_(60) presented in liposome is 1.09 x 10-4mol/dm3.The mo...A preparative technique to obtain water soluble C_(60)-liposome by means of molecular package of C_(60) with lecithin has been established.The concentration of C_(60) presented in liposome is 1.09 x 10-4mol/dm3.The molecular system of C_(60)-liposome with human cervix cancer cells is irradiated with laser(570nm,800mW),there is obvious biological effect of C_(60) to huma cervix cancer cells.展开更多
The John-Teller effect of the giant fullerene(GF)is studied.We find that in the giant fullerenes,the C-C bonds are dimerized,binding energies are decreased,energy gaps are enlarged,and the symmetries are reduced in th...The John-Teller effect of the giant fullerene(GF)is studied.We find that in the giant fullerenes,the C-C bonds are dimerized,binding energies are decreased,energy gaps are enlarged,and the symmetries are reduced in the metallic GF but not in the semiconducting GF.The dimerization patterns of these onions are presented.The distortions decrease as the number of carbon atoms on the GFs increases.展开更多
The narrow conduction band of C_(60) leads to the breakdown of the Migdal theorem and the McMillan formula is no longer applicable.In this letter,the second-order electron-phonon vertex correction is considered to exp...The narrow conduction band of C_(60) leads to the breakdown of the Migdal theorem and the McMillan formula is no longer applicable.In this letter,the second-order electron-phonon vertex correction is considered to explain the superconductivity in doped C_(60) solids and the transition temperature Tc thus obtained is in accordance with the experimental results.展开更多
The nonlineat third order optical susceptibility of C_(60) films on roughed glass plate has been studied by using a inode locked Nd:YAG laser emitting 8ps pulsed at 1.064 μm of 0.3 J energy.The large|χ^(3)(-3ω,ω,...The nonlineat third order optical susceptibility of C_(60) films on roughed glass plate has been studied by using a inode locked Nd:YAG laser emitting 8ps pulsed at 1.064 μm of 0.3 J energy.The large|χ^(3)(-3ω,ω,ω,ω)|=2 ×10^(-8) esu for C_(60) films of 15μm thickness has been observed,which is 1O^(3) larger than the value in the bulk C_(60).This is due to surface enhanced effect.展开更多
在数字化转型的时代背景下,新兴技术与城市空间结合有望解决城市长期以来的交通拥堵、环境污染、能源浪费等问题,促进城乡建设中“双碳”目标的达成。现有研究主要关注技术驱动下新城市空间的改变,缺乏其对城市碳减排效益的关注和系统...在数字化转型的时代背景下,新兴技术与城市空间结合有望解决城市长期以来的交通拥堵、环境污染、能源浪费等问题,促进城乡建设中“双碳”目标的达成。现有研究主要关注技术驱动下新城市空间的改变,缺乏其对城市碳减排效益的关注和系统性的梳理。因此,文章通过系统性文献综述的方法,在Web of Science(WOS)数据库中筛选出111篇文献,并分别在城市结构和城市居住、工作、交通、休闲四大功能空间综述科技发展对城市碳排放的影响。研究表明:①74%的文献认为新技术将有助于实现未来城市空间碳排放的减少;②线上线下结合的混合办公模式与共享出行等新型交通方式将为未来城市空间带来较高的碳减排效益;③新兴技术对城市碳排放的影响存在反弹效应,这会削减其带来的碳减排效益,需要进行综合考虑。最后,文章总结了新兴技术对未来城市空间碳排放的影响路径,有助于实现未来城市的低碳可持续发展。展开更多
以竹炭(BC)、聚氯乙烯(PVC)为原材料,制备竹炭/聚氯乙烯复合板材(BC/PVC),采用热重分析仪和热重⁃红外联用仪测试分析热失重特性,用锥形量热仪测试分析其燃烧特性,并进行了远红外辐射率和吸水厚度膨胀率等物理力学性能的测试。结果表明,B...以竹炭(BC)、聚氯乙烯(PVC)为原材料,制备竹炭/聚氯乙烯复合板材(BC/PVC),采用热重分析仪和热重⁃红外联用仪测试分析热失重特性,用锥形量热仪测试分析其燃烧特性,并进行了远红外辐射率和吸水厚度膨胀率等物理力学性能的测试。结果表明,BC/PVC的物理力学性能满足GB/T 24137—2009《木塑装饰板》和DB44 T 349—2006《木塑复合材料技术条件》规定的要求,尺寸稳定性优良。其中,BC的加入能够显著增强PVC的热稳定性,BC/PVC残余质量分数达45.05%,是PVC的5.3倍,且最大热分解温度延后,发生热失重的温度段缩短,热失重速率明显降低。BC/PVC燃烧时气体生成出现在中后期且总量不大,主要为CO2,BC有效减少燃烧过程中HCl的生成,降低了烟气毒性,且通过促进基材形成“有效炭层”,使BC/PVC的总热释放降低38.05%,烟气释放量仅为PVC的1/3,600 s时残炭量达到PVC的近11倍,整体阻燃防烟性能较好,显著提升材料在发生火灾时的安全性。BC/PVC在8~14μm波段的远红外发射率均值达0.938,具有较高的远红外辐射特性,有望实现PVC基复合板功能化的研发应用。展开更多
基金the National Natural Science Foundation of China,and Science Foundation of Zhejiang Province,P.R.China.
文摘A preparative technique to obtain water soluble C_(60)-liposome by means of molecular package of C_(60) with lecithin has been established.The concentration of C_(60) presented in liposome is 1.09 x 10-4mol/dm3.The molecular system of C_(60)-liposome with human cervix cancer cells is irradiated with laser(570nm,800mW),there is obvious biological effect of C_(60) to huma cervix cancer cells.
基金Supported by the National Natural Science Foundation of China.
文摘The John-Teller effect of the giant fullerene(GF)is studied.We find that in the giant fullerenes,the C-C bonds are dimerized,binding energies are decreased,energy gaps are enlarged,and the symmetries are reduced in the metallic GF but not in the semiconducting GF.The dimerization patterns of these onions are presented.The distortions decrease as the number of carbon atoms on the GFs increases.
基金the National Natural Science Foundation of China.
文摘The narrow conduction band of C_(60) leads to the breakdown of the Migdal theorem and the McMillan formula is no longer applicable.In this letter,the second-order electron-phonon vertex correction is considered to explain the superconductivity in doped C_(60) solids and the transition temperature Tc thus obtained is in accordance with the experimental results.
基金Supported by the National Natuiil Science Foundation of China,S.F.of Zhejiang Province,P.R.C.and Doctoral Foundation of China.
文摘The nonlineat third order optical susceptibility of C_(60) films on roughed glass plate has been studied by using a inode locked Nd:YAG laser emitting 8ps pulsed at 1.064 μm of 0.3 J energy.The large|χ^(3)(-3ω,ω,ω,ω)|=2 ×10^(-8) esu for C_(60) films of 15μm thickness has been observed,which is 1O^(3) larger than the value in the bulk C_(60).This is due to surface enhanced effect.
文摘在数字化转型的时代背景下,新兴技术与城市空间结合有望解决城市长期以来的交通拥堵、环境污染、能源浪费等问题,促进城乡建设中“双碳”目标的达成。现有研究主要关注技术驱动下新城市空间的改变,缺乏其对城市碳减排效益的关注和系统性的梳理。因此,文章通过系统性文献综述的方法,在Web of Science(WOS)数据库中筛选出111篇文献,并分别在城市结构和城市居住、工作、交通、休闲四大功能空间综述科技发展对城市碳排放的影响。研究表明:①74%的文献认为新技术将有助于实现未来城市空间碳排放的减少;②线上线下结合的混合办公模式与共享出行等新型交通方式将为未来城市空间带来较高的碳减排效益;③新兴技术对城市碳排放的影响存在反弹效应,这会削减其带来的碳减排效益,需要进行综合考虑。最后,文章总结了新兴技术对未来城市空间碳排放的影响路径,有助于实现未来城市的低碳可持续发展。
文摘以竹炭(BC)、聚氯乙烯(PVC)为原材料,制备竹炭/聚氯乙烯复合板材(BC/PVC),采用热重分析仪和热重⁃红外联用仪测试分析热失重特性,用锥形量热仪测试分析其燃烧特性,并进行了远红外辐射率和吸水厚度膨胀率等物理力学性能的测试。结果表明,BC/PVC的物理力学性能满足GB/T 24137—2009《木塑装饰板》和DB44 T 349—2006《木塑复合材料技术条件》规定的要求,尺寸稳定性优良。其中,BC的加入能够显著增强PVC的热稳定性,BC/PVC残余质量分数达45.05%,是PVC的5.3倍,且最大热分解温度延后,发生热失重的温度段缩短,热失重速率明显降低。BC/PVC燃烧时气体生成出现在中后期且总量不大,主要为CO2,BC有效减少燃烧过程中HCl的生成,降低了烟气毒性,且通过促进基材形成“有效炭层”,使BC/PVC的总热释放降低38.05%,烟气释放量仅为PVC的1/3,600 s时残炭量达到PVC的近11倍,整体阻燃防烟性能较好,显著提升材料在发生火灾时的安全性。BC/PVC在8~14μm波段的远红外发射率均值达0.938,具有较高的远红外辐射特性,有望实现PVC基复合板功能化的研发应用。
