湿膜动力学和稳定性

荷叶模板软光刻结合水热处理仿生制备三维有序ZnO结构及其润湿性可调

Biomimetic fabrication and tunable wetting properties of three-dimensional hierarchical ZnO structures by combining soft lithography templated with lotus leaf and hydrothermal treatments

采用溶胶-凝胶技术、软光刻技术和水热处理相结合的仿生方法，成功制备了具有荷叶状微纳结构的三维ZnO薄膜。用新鲜荷叶复制的PDMS模具将微米级的柱状结构直接压印到ZnO溶胶膜上。在此基础上，通过低温水热法在ZnO薄膜上生长二级ZnO纳米棒阵列，制备出分级ZnO微/纳米结构。通过调节水热反应时间可以很容易地控制ZnO分级微/纳米结构的形貌和尺寸。研究发现，经过低表面能的氟烷基硅烷改性后，分级结构的ZnO薄膜的润湿性由超亲水性转变为疏水性。通过增加ZnO纳米棒结构的生长，可以调节从疏水到超疏水的改善的润湿性能。

Film thickness of Pb islands on the Si(111) surface

We analyze topographic scanning force microscopy images together with Kelvin probe images obtained on Pb islands and on the wetting layer on Si(111) for variable annealing times. Within the wetting layer we observe negatively charged Si-rich areas. We show evidence that these Si-rich areas result from islands that have disappeared by coarsening. We argue that the islands are located on Si-rich areas inside the wetting layer such that the Pb/Si interface of the islands is in line with the top of the wetting layer rather than with its interface to the substrate. We propose that the Pb island hei…

Spin Ice Thin Film: Surface Ordering, Partial Magnetic Wetting and Emergent Square Ice

Motivated by recent realizations of Dy$_{2}$Ti$_{2}$O$_{7}$ and Ho$_{2}$Ti$_{2}$O$_{7}$ spin ice thin films, and more generally by the physics of confined gauge fields, we study a model of spin ice thin film with surfaces perpendicular to the $[001]$ cubic axis. The resulting open boundaries make half of the bonds on the interfaces inequivalent. By tuning the strength of these inequivalent "orphan" bonds, dipolar interactions induce a surface ordering equivalent to a two-dimensional crystallization of magnetic surface charges. This surface ordering can also be expected on the surfaces of bulk …

动力学限制是Ge金字塔形成的控制因素的证据：室温Ge沉积600 °C退火Ge/Si（001）润湿层结构特征的研究

Evidence for Kinetic Limitations as a Controlling Factor of Ge Pyramid Formation: a Study of Structural Features of Ge/Si(001) Wetting Layer Formed by Ge Deposition at Room Temperature Followed by Annealing at 600 °C

本文对Si（001）表面Ge量子点阵列的形成是一个平衡过程还是动力学控制的问题进行了实验研究。我们在室温下将Ge沉积在Si（001）上，并探索了作为600 °C退火结果的无序Ge膜的结晶。实验表明，在孤立系条件下形成的Ge/Si（001）薄膜由标准的补丁状润湿层和大滴状Ge团簇组成，而不是Ge原子流到达薄膜表面时所形成的小屋或圆顶。我们的结论是，在温度高于600 °C时出现的金字塔的生长是由动力学而不是热力学平衡控制的，而润湿层是平衡结构。

LEEM研究衬底温度对Ir{111}负载石墨烯上对六苯基薄膜生长的影响

The influence of substrate temperature on growth of para-sexiphenyl thin films on Ir{111} supported graphene studied by LEEM

利用低能电子显微镜（LEEM）实时研究了Ir{111}负载石墨烯片上对六苯基（6 P）薄膜的生长与衬底温度的关系。微低能电子衍射（μLEED）已被用来确定在表面上形成的不同6P特征的结构。我们观察到的成核和生长的润湿层组成的躺在生长的初始阶段的分子。石墨烯缺陷（皱纹）被发现是润湿层和沉积后期在润湿层顶部生长的6 P针状物成核的优先位点。润湿层和针的分子结构被发现是相似的。结果，对于针，仅观察到有限数量的生长方向。相比之下，在裸露的Ir{111}表面上，6P分子呈现直立取向。在320 K和352 K时，在Ir{111}裸表面上观察到分枝岛的形成，而在405 K时，观察到直立分子以阶梯流动的方式生长的连续层的形成。

Droplets capped with an elastic film can be round, elliptical, or nearly square

We present experiments which show that the partial wetting of droplets capped by taut elastic films is highly tunable. Adjusting the tension allows the contact angle and droplet morphology to be controlled. By exploiting these elastic boundaries, droplets can be made elliptical, with an adjustable aspect ratio, and can even be transformed into a nearly square shape. This system can be used to create tunable liquid lenses, and moreover, presents a unique approach to liquid patterning.

Molding Wetting by Laser-Induced Nanostructures

The influence of material characteristics - i.e., type or surface texture - to wetting properties is nowadays increased by the implementation of ultrafast lasers for nanostructuring. In this account, we exposed multilayer thin metal film samples of different materials to a femtosecond laser beam at a 1030 nm wavelength. The interaction generated high-quality laser-induced periodic surface structures (LIPSS) of spatial periods between 740 and 790 nm and with maximal average corrugation height below 100 nm. The contact angle (CA) values of the water droplets on the surface were estimated and the…

Evolution of Ge wetting layers growing on smooth and rough Si (001) surfaces: isolated {105} facets as a kinetic factor of stress relaxation

The results of STM and RHEED studies of a thin Ge film grown on the Si/Si(001) epitaxial layers with different surface relief are presented. Process of the partial stress relaxation was accompanied by changes in the surface structure of the Ge wetting layer. Besides the well-known sequence of surface reconstructions ($2 \times 1 \rightarrow 2 \times N \rightarrow M \times N$ patches) and hut clusters faceted with {105} planes, the formation of isolated {105} planes, which faceted the edges of $M \times N$ patches, has been observed owing to the deposition of Ge on a rough Si/Si (001) surface. …

异质外延中无核岛形成的动力学和有序性

Dynamics and ordering of the nucleationless island formation in heteroepitaxy

我们研究了生长晶体薄膜中应变岛的形态演化，采用了包括润湿性、弹性和沉积通量的连续描述。润湿破坏了平移不变性，允许通量调节不同的非线性区域。增加通量，我们发现第一个退火样的动力学，然后一个较慢的，但非常规的成熟，其次是一个稳定的制度，而岛密度不断增加。岛屿发展的空间相关性和有序性与狭窄的双峰距离分布和脊状集群的岛屿高通量。