In-situ TiC Reinforced Composite Coating Produced by Powder Feeding Laser Cladding

合成涂层在中等碳钢底层上与各种各样的形状和尺寸的 TiC 粒子增强了的 Ni 底合金被多层的激光 cladding 生产。Thechemical 作文，微观结构和 cladded 层的表面形态学用精力被分析散 X 光检查光谱学(EDX ) ，扫描电子显微镜(SEM ) ，和 X-raydiffractometry (XRD ) 。试验性的结果显示出那一在涂层和底层之间的优秀冶金的结合被获得。涂层的微观结构主要由 7-Ni 树突， CrB 的小数量， Ni_3B， M_(23 ) C_6 和驱散的 TiC 粒子组成。更多并且更大的 TiC 粒子在重叠地区形成了，它导致了一稍微这个地区的 highermicrohardness。涂层的最大的微坚硬关于 HV_(0.2 ) 是在微观结构上处理参数的激光的 1200 Theeffects，涂层的性质也被调查。

Superomniphobic surfaces for easy-removals of environmentalrelated liquids after icing and melting

Superhydrophobic surfaces often lose the easy-removal ability of liquids during icing&melting cycles due to the impalement phenomena of air pockets.Especially for the most common mixed liquids in normal life,their difficult-removals after icing and melting have brought colossal troubles in the fields of aviation,energy,biomedicine,etc.Here we adopt the ultrafast laser to fabricate the optimal micro-nanostructured surfaces,realizing excellent superomniphobicity for seven environmental-related liquids.It is demonstrated that different droplets on the surfaces recover well to the original Cassie-Baxter state after melting,and can be removed easily at low tilted angles.The ice adhesion strengths of the seven liquids as low as 5 kPa and the micro-nanostructure durability ensure the long-term easy-removal after icing.Compared with the ice adhesion strength of untreated surfaces(264.4±17.6 kPa),those of our designed surfaces have decreased by over 50 times.Icing and melting processes are investigated to reveal the easy-removal mechanisms that specifically distributed solutes and bubbles after icing impact downwards significantly to accelerate the recovery of the Cassie–Baxter state during melting.A series of environmental-related durability experiments including continuous icing&melting cycles,long-term salt spray,and high-pressure water jet impact further demonstrate the surfaces promising for real applications.

Localized in‑situ deposition:a new dimension to control in fabricating surface micro/nano structures via ultrafast laser ablation

Controllable fabrication of surface micro/nano structures is the key to realizing surface functionalization for various applications.As a versatile approach,ultrafast laser ablation has been widely studied for surface micro/nano structuring.Increasing research eforts in this feld have been devoted to gaining more control over the fabrication processes to meet the increasing need for creation of complex structures.In this paper,we focus on the in-situ deposition process following the plasma formation under ultrafast laser ablation.From an overview perspective,we frstly summarize the diferent roles that plasma plumes,from pulsed laser ablation of solids,play in diferent laser processing approaches.Then,the distinctive in-situ deposition process within surface micro/nano structuring is highlighted.Our experimental work demonstrated that the in-situ deposition during ultrafast laser surface structuring can be controlled as a localized micro-additive process to pile up secondary ordered structures,through which a unique kind of hierarchical structure with fort-like bodies sitting on top of micro cone arrays were fabricated as a showcase.The revealed laser-matter interaction mechanism can be inspiring for the development of new ultrafast laser fabrication approaches,adding a new dimension and more fexibility in controlling the fabrication of functional surface micro/nano structures.

Three-dimensional porous graphene sponges assembled with the combination of surfactant and freeze-drying

与表面活化剂和 freeze-drying 的联合，我们开发了二种 graphene 多孔的结构。在一方面，把肥皂水泡的泡沫用作模板，有富有的层次毛孔的三维的多孔的 graphene 海绵被综合了。材料的毛孔包含长度规模的三个层次，包括毫米，测微计和纳米。结构能被改变结冰媒介调节，调整激动人心的率或增加功能的添加剂。由 graphene 氧化物 / 表面活化剂暂停的直接 freeze-drying，在另一方面，有方向性地排列的毛孔的一个多孔的框架被准备。表面活化剂给 graphene 氧化物表的更好的分散，导致一个高特定的表面区域。两个获得的材料展出优秀吸收能力和好压缩性能，提供大量可能的应用程序，例如吸收剂，存储媒介，和搬运人。

Antireflection Surfaces for Biological Analysis Using Laser Desorption Ionization Mass Spectrometry

Laser desorption ionization mass spectrometry(LDI-MS)is a primary tool for biological analysis.Its success relies on the use of chemical matrices that facilitate sof desorption and ionization of the biomolecules,which,however,also limits its application for metabolomics study due to the chemical interference by the matrix compounds.Te requirement for sample pretreatment is also undesirable for direct sampling analysis or tissue imaging.In this study,antirefection(AR)metal surfaces were investigated as sample substrates for matrix-free LDI-MS.Tey were prepared through ultrafast laser processing,with high light-to-heat energy conversion efciency.Te morphology and micro/nanostructures on the metal surfaces could be adjusted and optimized by tuning the laser fabrication process.Te super-high UV absorption at 97%enabled highly efcient thermal desorption and ionization of analytes.Te analytical performance for the matrix-free LDI was explored by analyzing a variety of biological compounds,including carbohydrates,drugs,metabolites,and amino acids.Its applicability for direct analysis of complex biological samples was also demonstrated by direct analysis of metabolites in yeast cells.

Magnetic transitions in graphene derivatives

在 graphene 氧化物的磁性的转变(去) 试验性地被调查了。微米大小去薄片展出弱强磁性在房间温度伴随的主导的抗磁性。不管多么侧面的尺寸去薄片从微米尺寸被归结为 nano 尺寸，到强磁性的从主导的抗磁性的清楚的转变被观察。在化学上或热地减少 GO 以后，主导的磁性没除了铁磁性的部件的渐渐的改进显著地被改变。相反在 2 K，重要常磁性在两个是在场的微米大小、缩放 nano 去表。在 graphene 衍生物的磁性的转变上的不同的功能的组的效果进一步被调查了在氢氧根上使用 -- ， carboxyl- ，氨基 -- 并且 thiolfunctionalized graphene。结果表明有弱强磁性的那重要抗磁性在在所有这些 functionalized graphene 衍生物和不同的功能的组的能力的房间温度是在场的介绍磁性的时刻嘘跟随顺序 > 哦 >-COOH,-NH 2 。尤其是，在 5 点， K，抗磁性，常磁性和强磁性在 thiol- 共存， hydroxyland carboxyl-functionalized graphene 当 amino-graphene 展出主导的常磁性时，类似于低温度的磁力在去。这些结果显示那抗磁性，常磁性和强磁性能在三个状态之中在 graphene 衍生物和磁性的转变共存能被完成它取决于边状态，空缺，化学的做和依附的功能的组。获得的结果可以帮助关于 graphene 相关的材料的磁力解决当前的争吵。