具有反应活性的纤维素基微/纳米颗粒功能化超疏水表面的制备与表征

Preparation and Characterization of Reactive Superhydrophobic Surface Based on Cellulose-derived Micro/Nanoparticle

以微晶纤维素为原料,通过亲核取代反应合成了10-十一烯酸-硬脂酸纤维素酯(CSU)衍生物,并采用纳米沉淀法制备了CSU微/纳米颗粒,将其喷涂在CSU溶液浸渍的硅片表面后,制备出一种具有反应活性的超疏水表面。采用核磁共振波谱仪(NMR)、傅里叶变换红外光谱仪(FT-IR)、Zeta电位粒度仪(DLS)、扫描电子显微镜(SEM)及巯基-烯点击化学反应体系对CSU微/纳米颗粒及其构建的超疏水表面进行表征。重点探究了该表面的超疏水机理、热稳定性和反应活性。结果表明,所制备的CSU微/纳米颗粒平均直径约为(149±3)nm,多分散性指数(PDI)为0.132;所构建的超疏水表面的表面接触角为(153±1)°,滚动角为7°;该表面的超疏水性在温度高于40℃时不稳定,且可通过巯基-烯点击化学反应进行再功能化。

Using microcrystalline cellulose as raw material,cellulose stearoyl ester/10-undecyl ester(CSU)compound was synthesized by nucleophilic substitution,and the derived CSU micro/nanoparticles were prepared by nanoprecipitation.By spray-coating of the resulting micro/nanoparticles on the surface of silicon wafer which was impregnated with CSU solution,a reactive superhydrophobic surface was obtained.The nuclear magnetic resonance spectrometer(NMR),Fourier transform infrared spectrometer(FT-IR),Zeta potential analyzer(DLS),scanning electron microscope(SEM),and thiol-ene click chemical reaction system were used to characterize CSU and the superhydrophobic surface coated with CSU.The superhydrophobic mechanism,thermal stability and reactivity of this surface were mainly investigated.Results showed that the average diameter of CSU micro/nanoparticles was about(149±3)nm,the polydispersity index(PDI)was 0.132;the contact angle of the generated superhydrophobic surface was(153±1)°,and the sliding angle was 7°;its superhydrophobicity was unstable when temperature was above 40℃,and it could be further functionalized by the photoclick thiol-ene reaction.