排序方式: 共有220条查询结果,搜索用时 15 毫秒
81.
Shawn J. Tan Jason S. Kahn Thomas L. Derrien Michael J. Campolongo Mervin Zhao Detlef‐M. Smilgies Dan Luo 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2014,126(5):1340-1343
The multiparametric nature of nanoparticle self‐assembly makes it challenging to circumvent the instabilities that lead to aggregation and achieve crystallization under extreme conditions. By using non‐base‐pairing DNA as a model ligand instead of the typical base‐pairing design for programmability, long‐range 2D DNA–gold nanoparticle crystals can be obtained at extremely high salt concentrations and in a divalent salt environment. The interparticle spacings in these 2D nanoparticle crystals can be engineered and further tuned based on an empirical model incorporating the parameters of ligand length and ionic strength. 相似文献
82.
83.
84.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(28):8186-8190
We report on a bistable MEMS device actuated by spin‐crossover molecules. The device consists of a freestanding silicon microcantilever with an integrated piezoresistive detection system, which was coated with a 140 nm thick film of the [Fe(HB(tz)3)2] (tz=1,2,4‐triazol‐1‐yl) molecular spin‐crossover complex. Switching from the low‐spin to the high‐spin state of the ferrous ions at 338 K led to a reversible upward bending of the cantilever in agreement with the change in the lattice parameters of the complex. The strong mechanical coupling was also evidenced by the decrease of approximately 66 Hz in the resonance frequency in the high‐spin state as well as by the drop in the quality factor around the spin transition. 相似文献
85.
《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(40):12265-12269
We report the synthesis and electron donor–acceptor features of a novel nanohybrid, in which the light‐harvesting and electron‐donating properties of a meso ‐tetraarylporphyrin (TArP) are combined with the electron‐accepting features of nitrogen‐doped carbon nanodots (NCNDs). In particular, in an ultrafast process (>1012 s−1), visible‐light excitation transforms the strongly quenched porphyrin singlet excited states into short‐lived (225 ps) charge‐separated states. On the other hand, ultraviolet light excitation triggers a non‐resolvable transduction of singlet excited state energy from the NCNDs to the porphyrins, followed by the same charge separation observed upon visible light excitation. 相似文献
86.
87.
88.
89.
90.