4 research outputs found

    Reliable Manipulation of Gas Bubble Size on Superaerophilic Cones in Aqueous Media

    No full text
    Gas bubbles in aqueous media are ubiquitous in a broad range of applications. In most cases, the size of the bubbles must be manipulated precisely. However, it is very difficult to control the size of gas bubbles. The size of gas bubbles is affected by many factors both during and after the generation process. Thus, precise manipulation of gas bubble size still remains a great challenge. The ratchet and conical hairs of the Chinese brush enable it to realize a significant capacity for holding ink and transferring them onto paper continuously and controllably. Inspired by this, a superhydrophobic/superaerophilic cone interface is developed to manipulate gas bubble size in aqueous media. When the resultant force between the Laplace force and the axial component of the buoyancy force approaches zero, the gas bubble is held steadily by the superhydrophobic/superaerophilic copper cones in a unique position (balance position). A new kind of pressure sensor is also designed based on this principle

    Reliable Manipulation of Gas Bubble Size on Superaerophilic Cones in Aqueous Media

    No full text
    Gas bubbles in aqueous media are ubiquitous in a broad range of applications. In most cases, the size of the bubbles must be manipulated precisely. However, it is very difficult to control the size of gas bubbles. The size of gas bubbles is affected by many factors both during and after the generation process. Thus, precise manipulation of gas bubble size still remains a great challenge. The ratchet and conical hairs of the Chinese brush enable it to realize a significant capacity for holding ink and transferring them onto paper continuously and controllably. Inspired by this, a superhydrophobic/superaerophilic cone interface is developed to manipulate gas bubble size in aqueous media. When the resultant force between the Laplace force and the axial component of the buoyancy force approaches zero, the gas bubble is held steadily by the superhydrophobic/superaerophilic copper cones in a unique position (balance position). A new kind of pressure sensor is also designed based on this principle

    Reliable Manipulation of Gas Bubble Size on Superaerophilic Cones in Aqueous Media

    No full text
    Gas bubbles in aqueous media are ubiquitous in a broad range of applications. In most cases, the size of the bubbles must be manipulated precisely. However, it is very difficult to control the size of gas bubbles. The size of gas bubbles is affected by many factors both during and after the generation process. Thus, precise manipulation of gas bubble size still remains a great challenge. The ratchet and conical hairs of the Chinese brush enable it to realize a significant capacity for holding ink and transferring them onto paper continuously and controllably. Inspired by this, a superhydrophobic/superaerophilic cone interface is developed to manipulate gas bubble size in aqueous media. When the resultant force between the Laplace force and the axial component of the buoyancy force approaches zero, the gas bubble is held steadily by the superhydrophobic/superaerophilic copper cones in a unique position (balance position). A new kind of pressure sensor is also designed based on this principle

    Annealing-Free SnO<sub>2</sub> Layers for Improved Fill Factor of Perovskite Solar Cells

    No full text
    Perovskite solar cells (PSCs) have developed rapidly with simplified planar structures, in which the electron transport layer (ETL) is one of the key components for high efficiency. As one of the most widely used ETLs for PSCs, a tin dioxide (SnO2) ETL is usually obtained by thermal annealing at around 150 °C, which complicates the fabrication process and confines the application of PSCs onto thermally sensitive flexible substrates. Here, we adopted an annealing-free process for the first time, the negative pressure evaporation (NPE) method, to quickly prepare SnO2 ETLs (NPE-SnO2) within 1 minute at room temperature from widely used commercial aqueous SnO2 colloid. The NPE process developed here significantly improves the surface morphology and conductivity of SnO2 layers compared to the traditional thermally annealed ones (A-SnO2). Detailed characterizations reveal that increased oxygen vacancies and reduced hydroxyl defects contribute to higher conductivity of NPE-SnO2 and less interfacial recombination of PSCs. Therefore, a PSC with NPE-SnO2 delivers an improved fill factor (FF) of 82.33% and a higher power conversion efficiency (PCE) of 23.07%, which is the highest value based on annealing-free SnO2. To conclude, the NPE process is a universal technique to obtain high-quality semiconductor films from their wet state within 1 min and opens up the possibility of fabricating functional layers of PSCs without thermal annealing
    corecore