第四类结构材料问世?俞书宏院士团队研制纤维素基结构材料,性能远超传统材料
CNFP是由多层纤维素薄膜组合起来的,在这些纤维素薄膜内部有由纤维束缠结和氢键等物理作用构建的强相互作用,因此单独的薄膜力学强度较高,但是组装到一起后,这些薄膜之间的界面作用相对较弱。
《自然》(20221208)一周论文导读
作者:Kurt H. Kjær, Mikkel Winther Pedersen, Bianca De Sanctis, Binia De Cahsan, Thorfinn S. Korneliussen, Christian S. Michelsen, Karina K. Sand, Stanislav Jelavić, Anthony H. Ruter, Astrid M. A. Schmidt, Kristian K. Kjeldsen, Eske Willerslev, etc.作者研究了旋转涂层、叶片涂层、喷涂涂层、喷墨打印和槽模印刷等方法来沉积杂化钙钛矿薄膜。
世界能源技术展望2020—钢铁技术路线图(旗舰报告,强烈推荐,执行摘要翻译,文末含全文下载地址)
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《自然》(20220818出版)一周论文导读
Abstract:Pumps are transport mechanisms in which direct currents result from a cyclic evolution of the potential. As Thouless showed, the pumping process can have topological origins, when considering the motion of quantum particles in spatially and temporally periodic potentials. However, the periodic evolution that drives these pumps has always been assumed to be imparted from outside, as has been the case in the experimental systems studied so far. Here we report on an emergent mechanism for pumping in a quantum gas coupled to an optical resonator, where we observe a particle current without applying a periodic drive. The pumping potential experienced by the atoms is formed by the self-consistent cavity field interfering with the static laser field driving the atoms. Owing to dissipation, the cavity field evolves between its two quadratures, each corresponding to a different centrosymmetric crystal configuration. This self-oscillation results in a time-periodic potential analogous to that describing the transport of electrons in topological tight-binding models, such as the paradigmatic Rice–Mele pump. In the experiment, we directly follow the evolution by measuring the phase winding of the cavity field with respect to the driving field and observing the atomic motion in situ. The observed mechanism combines the dynamics of topological and open systems, and features characteristics of continuous dissipative time crystals.
8.5万字,111个图!深圳大学材料领域顶尖综述期刊(IF=39.58)发文
近日,深圳大学物理与光电工程学院核科学与核技术系先进核能团队的龚星博士在国际材料科学领域顶尖综述期刊《Progress in Materials Science》上发表题为《Environmental degradation of structural materials in liquid lead- and lead-bismuth eutectic-cooled reactors》的综述文章,全文约8.5万字,含6大章节,111个图。
气凝胶/二硒化铌超晶格材料中实现电声子解耦 | 进展
自石墨烯被发现以来,原子层级别厚度的二维材料引起了学界的广泛关注。与普通块体材料相比,剥离后的单层材料,其电子和声子均呈现出完全的二维化行为特征,诱发了丰富多样的新奇物性。然而,二维材料多依赖于衬底的约束,来自衬底的电子特别是声子的影响无法避免。
『材质之美』大自然的馈赠:[木头材质]
授权来源:钛设计(微信号taisheji )[设计师寄语]行动,是一切梦想成真的开始。在塑料开始大面积应用之前,木头是最常用的产品外观材料之一,被广泛应在中生活的各个领域。即使是塑料制品堆积的现代生活,人们总能从各种各样的产品中发现木头的存在,从家具到时尚包包,从电子产品到骑车。
超禁带金刚石半导体的挑战、功率器件进展与新兴恶劣环境应用
核心结论:金刚石凭借其超宽禁带与高导热性,在高压、高温、强辐射等特种应用中潜力显著,但n型掺杂与规模化制造仍是其迈向主流功率半导体的关键瓶颈。
全面取代塑料?中科院院士团队最新研究登上Science子刊
从 -120°C 到 150°C,CNFP 的热膨胀系数低于 5 ppm/K,这接近于陶瓷材料,远低于典型的聚合物和金属。