Sequential Evaporation–Induced Formation of Polymeric Surface Microdents via Ouzo Effect

Wang, Yuliang; Zeng, Binglin; Li, Xiaolai; Zhang, Xuehua

doi:10.1002/admi.201900002

Cited by 8 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The acetone liquid evaporates first and the Ouzo effect takes place, then water droplets start to nucleate on the surface, and then the nucleated water droplets act as templates for the fabrication of micro/nanostructure on the PS film. The detailed procedure can prefer ref . Note that it is necessary to avoid the introduction of impurities when preparing PS film, which might produce blisters in nanobubble experiments.…”

Section: Methodsmentioning

confidence: 99%

Manipulating Trapped Nanobubbles Moving and Coalescing with Surface Nanobubbles

et al. 2022

Langmuir

View full text Add to dashboard Cite

Trapped nanobubbles are observed nucleating at nanopits on a pitted substrate, while surface nanobubbles are usually formed on the smooth solid surface in water. In this work, trapped nanobubbles and surface nanobubbles were captured by a tapping-mode atomic force microscope (AFM) on a nanopitted substrate based on the temperature difference method. A single trapped nanobubble was manipulated to change into a surface nanobubble, then to change into the trapped nanobubble again. At the same time, surface nanobubbles can be moved to merge into a trapped nanobubble. Our results show that the scan load and the size of the scan area were the main factors that significantly affect the mobility of surface/trapped nanobubbles. The coalescence and mutual transformation of the two kinds of nanobubbles indicate that trapped nanobubbles and surface nanobubbles have the same chemical nature, which also provides vital experimental proof of the existence of nanobubbles in the course of contact line depinning. Our results are of great significance for understanding nanobubble stability and providing guidelines in some industrial applications.

show abstract

Section: Methodsmentioning

confidence: 99%

Manipulating Trapped Nanobubbles Moving and Coalescing with Surface Nanobubbles

et al. 2022

Langmuir

View full text Add to dashboard Cite

show abstract

“…A schematic diagram of the operation based on the mechanical peeling method is shown in Figure a, where Scotch 3M adhesive is applied to the HOPG block and then slowly removed to dissociate the new HOPG flat or nanostep structured surface. PS nanoindent surfaces were prepared by a method based on phase separation triggered by the evaporation of multiple solutions. − A circular silicon wafer (35 mm in diameter) was used as a substrate for the fabrication of nanoindents on the PS surface. A glass Petri dish (35 mm in diameter, 5 mm in height) was used as a container to hold the wafers, and AB glue was used to fix the sample and the glass Petri dish.…”

Section: Simulation Study Of Surface Energy On the Stability Of Nanob...mentioning

confidence: 99%

Surface Morphology Enriching the Energy Barrier Leads to the Adsorption Characteristic of Nanobubbles

Wang

2023

Langmuir

View full text Add to dashboard Cite

With the emergence of nanobubble research, nanobubble distribution morphology at the interface and its stability control become the bottlenecks of nanobubble resistance reduction applications. In this paper, the evolutionary behavior of nanobubbles on smooth and step HOPG surfaces was compared through molecular dynamics studies. The results show that the surface energy barrier provided by the step HOPG surface restricts diffusion of gas molecules. Then, a method of multisolvent evaporation for preparing hydrophobic nanoindent surfaces was proposed, which can achieve phase separation through different evaporation rates of multisolvents, thus realizing the preparation of surface structures with uniform distribution of nanoindents. In this paper, the nucleation processes of nanobubbles on PS nanoindent hydrophobic surface, HOPG flat hydrophobic surface, and HOPG nanostep hydrophobic surface were compared by using atomic force microscopy in liquid experiment. The evolution of the volume and distribution morphology of nanobubbles on the three nanostructures was observed by 24 h in situ tests, revealing that the energy barrier effect arising from the uneven surface structure can effectively prevent adjacent nanobubbles from merging in close proximity to each other. It is also pointed out that the hydrophobic nanoindents prepared by using the multivariate solvent evaporation method in this paper can cover most of nanobubbles for stable adsorption. It can be seen from the results that the volume drop of the nanobubbles on the HOPG flat hydrophobic surface is 27% and that on the HOPG nanostep and the PS nanoindent hydrophobic surface it is reduced to 19% and 3% under the effect of structural energy barriers, respectively. The density of the nanostructures determines whether the existence of nanobubbles is stable. The coverage of nanobubbles on the HOPG flat hydrophobic surface was 3.313% when the existence of nanobubbles was mostly stable. The HOPG nanostep and PS nanoindent sizes were positively correlated with the morphological size of the nanobubbles, which increased the coverage of the nanobubbles on the hydrophobic surface of the HOPG nanostep and PS nanoindent to 5.229% and 4.437%, respectively, when the existence of nanobubbles was mostly stable.

show abstract

“…However, the evaporation of liquid leads to an irregular shape of the fabricated microlenses . To improve the sphericity of the fabricated microlenses, photopolymerization can be directly used to convert the monomer precursor droplets into solid microlenses by a process which is termed as the Ouzo effect. − …”

Section: Introductionmentioning

confidence: 99%

Formation of Polystyrene Microlenses via Transient Droplets from the Ouzo Effect for Enhanced Optical Imaging

Wang¹,

Zeng²,

Zhao³

et al. 2019

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

Lens-shaped microstructures on solid surfaces are important for a variety of applications, such as enhanced water harvesting, super-resolution imaging, and antireflection. Here the formation of polymeric microlenses with tunable contact angles based on an Ouzo effect is reported. In this process, water is added into a binary toluene/ethanol solution in contact with a polystyrene (PS) thin film. The dilution by water leads to spontaneous formation of toluene microdroplets due to the reduced solubility of toluene in the ternary liquid mixture (i.e., the Ouzo effect). PS in the thin film is dissolved into the toluene droplets. However, the droplets containing PS and toluene are not stable against dissolution, and eventually toluene dissolved into the surrounding ternary mixture. PS in the droplets is left on the substrate, forming microlenses on the supporting glass substrate. The size and density of PS lenses are influenced by PS film thickness and toluene concentration in the surrounding liquid. The contact angle of PS microlens could be varied through a thermal reshaping method. As demonstration for potential applications, the results show that the as-prepared microlenses can improve the spatial resolution of a standard upright optical microscope.

show abstract

Sequential Evaporation–Induced Formation of Polymeric Surface Microdents via Ouzo Effect

Cited by 8 publications

References 40 publications

Manipulating Trapped Nanobubbles Moving and Coalescing with Surface Nanobubbles

Manipulating Trapped Nanobubbles Moving and Coalescing with Surface Nanobubbles

Surface Morphology Enriching the Energy Barrier Leads to the Adsorption Characteristic of Nanobubbles

Formation of Polystyrene Microlenses via Transient Droplets from the Ouzo Effect for Enhanced Optical Imaging

Contact Info

Product

Resources

About