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纳米气泡凭借独特的物理化学性质和生理活性引起了国内外的广泛关注,其在废水处理、土壤和地下水修复、矿物浮选、动植物生长以及生物医学等领域具有良好的发展空间和应用前景.近年来,随着各类技术的不断进步,人们对纳米气泡的研究工作取得了一系列成果,尤其是在纳米气泡的形成机制和测定方法方面.文中概述了目前国内外纳米气泡常用的制备方... 相似文献
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《Small Methods》2017,1(7)
Metal–organic frameworks (MOFs) have been widely employed as precursors to prepare various nanostructured functional materials. Here, a “nanoparticles‐in‐MOF” dual‐template approach for generating complex cobalt sulfide (CoS) nanobubble cages is reported. A novel nanoparticles‐in‐MOF hybrid structure consisting of a Co‐based MOF polyhedron host and many encapsulated mesostructured TiO2 nanospheres is first prepared, followed by a sulfidation process to obtain a complex cage structure consisting of CoS nanobubbles in the shell. Importantly, this strategy can be extended to prepare many other functional nanoparticles‐in‐MOF hybrid structures. When evaluated as an electrode material for hybrid supercapacitors, the as‐derived CoS nanobubble cages display remarkable electrochemical performance with long cycle life and good rate capability. 相似文献
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《Small Methods》2018,2(1)
The desire for high sensitivity, resolution, low toxicity, and fast clearance contrast agents has driven the research for new nanomaterial systems. The drawbacks of traditional molecular probes limit their bioimaging ability, hence the exploration of emerging nanomaterials for multimodal bioimaging continues with rational designs. The key for realizing effective multimodal bioimaging is harnessing the physical and chemical properties of the nanomaterials. Although some nanomaterials possess multimodality intrinsically, those imaging modes may not be sufficient to meet the increasing demands of various applications. Therefore, the fabrication of novel composite structures by integrating various nanomaterials or molecules may overcome the challenging issues in multimodal bioimaging. An overview and considerations for multimodal bioimaging and the requirements regarding the nanomaterials are presented. The recently emerged nanomaterials and their composite structures for multimodal bioimaging are highlighted, including the recently emerging 2D materials. The traditional nanomaterials also show breakthroughs in terms of novel structures and morphologies, which would affect the contrast ability, entrance, and clearance from the in vivo models. Finally, some suggestions for toxicity studies of nanomaterials and new strategies are presented for realizing the advance of multimodal bioimaging. 相似文献
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Wei Wang Lijun Zhou Sheng Hu Konstantin S. Novoselov Yang Cao 《Advanced functional materials》2021,31(6):2005053
2D crystals with noncentrosymmetric structures exhibit piezoelectric properties that show great potential for applications in energy conversion and electromechanical devices. Quantitative visualization of piezoelectric field spatial distribution is expected to offer a better understanding of macroscopic piezoelectricity, yet remains to be realized. Here, a technique of mapping piezoelectric potential on 2D materials bubbles based on the measurements of surface potential using kelvin probe force microscope is reported. By using odd number of layers hexagonal boron nitride and MoS2 nanobubbles, strain-induced piezoelectric potential profiles are quantitatively visualized on the bubbles. The obtained piezoelectric coefficient is 3.4 ± 1.2 × 10−10 C m−1 and 3.3 ± 0.2 × 10−10 C m−1 for hBN and MoS2, in agreement with the values reported. On the contrary, homogeneous distribution of surface potential is measured on even number of layers crystals bubbles where the crystal's inversion symmetry is restored. Using such technique, in situ visualization of photogenerated charge carrier separation under piezoelectric potential is also achieved, which offers a platform of investigating the coupling between piezoelectricity and photoelectric effect, and an approach of tuning piezoelectric field. The present work should aid the understanding of local piezoelectric potential and its various affecting factors including substrate doping and external stimuli, and give insights for designing piezoelectric nanodevices based on 2D nanobubbles. 相似文献
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Pramesh Dhungana Bhesh Bhandari 《International Journal of Food Science & Technology》2021,56(9):4268-4277
A novel continuous nanobubble generation method was developed using a commercial ceramic membrane as a nanobubble generator. CO2 and air were infused externally across the ceramic membrane (pore size 50 nm) into the water flowing inside the ceramic membrane tube. Infusion of each gas was done in a single (20 s) and multiple passes (180 s) at 20–21°C. Results showed that gaseous nanobubbles could be generated even in a single pass. Low power ultrasound (200 kHz, 30W) was applied for the rapid assessment of nanobubble stability. Single-pass ultrasound treatment of the samples was carried out at two levels: 2.6 and 5.1 J mL−1. Among the samples in which gases were infused for multiple passes, air nanobubbles were found more stable than CO2. In contrast, an opposite trend was observed in those samples in which gases were infused in the single-pass only (20 s). This process has the potential to be applied to food processing industries, such as to enhance the products’ sensory attributes, the efficiency of membrane separation, food drying and liquid food transportation systems. 相似文献
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