Controlling the Coffee Ring Effect on Graphene and Polymer by Cations

Recently,there are great efforts that have been taken to suppressing/controlling the coffee ring effect,but it is of challenge to achieve inexpensive and efficient control with less disturbance,suitable for scalable production and highly enhancing the printing/dyeing color fastness.By only adding trace amounts of salt into the suspensions,here we experimentally achieve the facile and highly efficient control of the coffee ring effect of suspended matter on substrates of graphene,natural graphite...     

New Insight of Fe Valence State Change Using Leaves:A Combined Experimental and Theoretical Study

Fe²⁺is of considerable importance in plant growth and crop production.However,most Fe elements in nature favor existing in the trivalent state,which often causes the deficiency of Fe²⁺in plants.Here,we report the Fe valence state change from Fe³⁺to Fe²⁺by using leaves.This valence state change was confirmed by x-ray photoelectron spectroscopy in Fe-Cl@leaves.Fourier transform infrared and ultraviolet-visible spectroscopy demonstrated that aromatic ring...     

离子溶液中的芳香环:反常化学计量比的二维晶体和其铁磁性

溶液中的水合离子-π作用,作为一种非共价键相互作用,对研究软凝聚态物质至关重要。本文回顾了基于水合离子-π作用得到的具有反常化学计量比的二维晶体及其奇异特性,这些晶体包括常温常压条件下的氯化二钠(Na₂Cl)、氯化三钠(Na₃Cl)和一氯化钙(CaCl)等。这些具有反常化学计量比的二维晶体有着不同于常规三维晶体中的阴阳离子比例与独特的电子结构,具有与常规三维晶体完全不同的物理化学性质,包括室温铁磁性在内的多种特殊物理性质。这类具有反常化学计量比的铁磁性物质可能为生物体系的磁效应、磁医学的研究以及低维磁性材料的设计提供全新的思路。