报道了在μm量级圆柱状金柱腔中原位成型制备微孔泡沫的方法。在直径400 μm、长度700 μm、壁厚20 μm、两端开口的金柱腔中原位成型成功制备出密度为50 mg·cm-3、蜂窝直径不超过1 μm的多元丙烯酸酯聚合物微孔泡沫。干燥过程中泡沫没有明显收缩,在柱腔中填充紧密,无需后续机械加工。

The preparation of microcellular foam in sub-millimeter cylindrical gold targets is described.Small,open-ended,gold cylinders of 400 μm diameter,700 μm length,and 20 μm wall thickness were fabricated by electroplating gold onto a silicon bronze mandrel and leaching the mandrel with concentrated nitric acid.After several rinsing and cleaning steps,the cylinders were filled with a solution containing acrylate monomers.The solution was polymerized in situ with ultraviolet light to produce a gel.Precipitation of these gels in a non-solvent such as methanol and subsequent drying by means of a critical point drying apparatus produced cylinders filled with microporous foams.The foams have densities of 50 mg·cm-3 and cell sizes no more than 1 μm.They fill the cylinders completely without shrinkage during the drying process,and need no subsequent machining.