Hollow particles have attracted considerable attention owing to their unique properties. In this study, hollow monoclinic zirconia particles were directly synthesized from inkjet droplets of a zirconyl hydroxychloride aqueous solution via atmospheric-pressure plasma processing. Hollow structures with craggy surfaces were obtained in the plasma at gas temperatures above 1000 K. The steep solvent evaporation rate induced by the localized high-energy reaction field of the atmospheric-pressure plasma may have induced solute condensation near the droplet surface and contributed to the formation of hollow particles. The average diameter of the synthesized particles was ~ 3 μm, while their size distribution was narrow (coefficient of variation: 0.06–0.10). The high reproducibility of the synthesized particles was attributed to the small variations in inkjet droplet size. The proposed method enables the rapid synthesis of hollow particles of various inorganic materials, while controlling their number and composition.

空心颗粒由于其独特的性能而引起了人们的广泛关注。在这项研究中，通过大气压等离子体处理，由羟基氯化氧锆水溶液的喷墨液滴直接合成空心单斜氧化锆颗粒。在气体温度高于 1000 K 的等离子体中获得了具有粗糙表面的中空结构。大气压等离子体的局部高能反应场引起的陡峭溶剂蒸发速率可能在液滴表面附近引起溶质凝结，并有助于空心颗粒的形成。合成颗粒的平均直径约为 3 μm，而尺寸分布较窄（变异系数：0.06–0.10）。合成颗粒的高再现性归因于喷墨液滴尺寸的微小变化。该方法能够快速合成各种无机材料的空心颗粒，同时控制它们的数量和成分。