In this work, we demonstrate that particles can be coated in a fluidized bed with coating solution provided by a novel aerosol generator. Aerosol droplets are smaller than 1 μm in volume-based diameter, hence they are very much smaller than droplets in conventional spray fluidized bed processes (around 40 μm). A proof-of-principle experiment with 30% aqueous coating solution of sodium benzoate and γ-Al₂O₃ core particles in 150 mm fluidized bed fed with droplet aerosol supplied from the chamber side is presented. To simultaneously coat and dry the particles, inlet of fluidization air was at 50 °C. Moreover, Monte Carlo simulations of coating with small aerosol and large spray droplets were conducted. Due to dramatically smaller building blocks, ultrathin particle coating of high-resolution (very small layer thickness) can be attained with the new aerosol process, with the potential of even going nanoscale. Full coverage of particles is reached substantially faster than in the conventional process, so that material demand is much lower and sensitive materials can be processed in short residence time. Solids yield of around 30% was much higher than expected, that is considered to be technically viable and may be enhanced by the recycling of entrained solids or better equipment design.

在这项工作中，我们证明了可以在流化床中用新型气溶胶发生器提供的包衣溶液包被颗粒。气溶胶液滴的体积直径小于1μm，因此，它们比常规喷雾流化床工艺中的液滴（约40μm）小得多。验证的原理的实验用苯甲酸钠和30％的水性涂布液的γ-Al ₂ ö ₃介绍了在150毫米流化床中由室侧提供的液滴气溶胶供入的核心颗粒。为了同时涂覆和干燥颗粒，流化空气的入口温度为50°C。此外，进行了小气溶胶和大雾滴涂层的蒙特卡罗模拟。由于显着较小的构件，采用新的气溶胶工艺可以实现高分辨率的超薄颗粒涂层（非常小的层厚度），甚至具有纳米级的潜力。粒子的完全覆盖要比传统方法快得多，因此对材料的需求低得多，并且可以在短停留时间内处理敏感材料。固体产率约为30％，远高于预期，