通过在水凝胶体系内引入梯度排布的空心玻璃微珠(hollow glass microsphere,HGM),制备了一种具有超高导水效率的分形自泵(fractal self-pumping,FS)水凝胶。在所制备的分形自泵空心玻璃微珠水凝胶(FS-HGM hydrogel)中,水凝胶骨架通过硅烷偶联剂将相邻空心玻璃微珠紧密结合固定,在玻璃微球间形成了逐级变小的亲水分形毛细微通道。结果表明,独特的分形毛细微通道极大地提高了水凝胶的导水性能,在动态接触角实验中表现出超过传统水凝胶约240倍的吸水速率,并且吸水效率随着FS-HGM水凝胶层的增厚有所提升。所制备的快速吸水分形凝胶通过高效移除过量渗出液,加速烫伤伤口愈合,为临床应用中输运生物流体开辟了新途径。

A fractal self-pumping (FS) hydrogel with ultra-fast water absorption property is fabricated by adding gradient hollow glass microspheres into a hydrogel system.In the prepared fractal self-pumping hollow glass microsphere (FS-HGM) hydrogel,the hydrogel frameworks bond the adjacent hollow glass microspheres well through silane coupling agent,forming fractal hydrophilic microchannels with gradually decreased diameter.It is verified that these unique fractal capillary microchannels greatly improve the water conductivity of hydrogel.In the dynamic contact angle experiment,the water absorption speed of the FS-HGM hydrogel is 240 times that of the conventional hydrogel.The water absorption efficiency can be improved by increasing the thickness of FS-HGM layer.The prepared FS-HGM hydrogel exhibits great potential in accelerating burn wound healing by draining excessive exudates and paves a new avenue for transporting bio-fluid in clinical applications.

兰晋泽(1994-),男,博士生,研究方向为分形结构材料,lanjinze16@mails.ucas.ac.cn。