微流体纺丝制备丝素纳米银/PVA共混纤维的研究

Study on preparation of silk fibroin stabilized silver nanoparticles/PVA composite microfibers by microfluidic spinning

微流体纺丝技术被广泛用于制备微纳米纤维,能够很好地控制纤维的形状、尺寸、组成。文章首次利用微流体纺丝技术制备了丝素纳米银/PVA共混纤维,考察了影响纺丝质量的工艺参数。结果表明:当丝素纳米银/PVA共混溶液的质量比为1︰5,PVA甲酸溶液质量分数为25%,注射泵推进速率为0.5 m L/h,步进平移频率为30 Hz,旋转电机速率为200 r/min时,制备出的纤维直径约为13~14μm,且整齐均一,粘连断丝现象较少,整体外观简洁美观。SEM和DLS测试表明纳米银粒径约为30~50 nm,且分散均匀,X射线衍射显示丝素纳米银/PVA共混纤维中确实存在纳米银的特征衍射峰,红外光谱(FTIR)的测试结果证明PVA与丝素纳米银共混后产生了相互作用。

Microfluidic spinning technology has been widely used to prepare micro-nano fibers, for it can control the morphology, size and composition of fibers very well. In this paper, the silk fibroin stabilized silver nanoparticles/PVA microfibers were reported by microfluidic spinning for the first time, and the effect of different spinning conditions on microfibers were investigated. The results shown that the morphology of microfibers were uniform and neat when the ratio of silk fibroin stabilized silver nanoparticles/PVA was 1：5, concentration of PVA solution was 25wt%, injection pump advance rate was 0.5 mL/h, stepping translation frequency was 30 Hz, and the rotating motor speed was 200 rad/min. SEM and DLS characterizations shown that the silver nanoparticles were 30-50 nm and dispersed uniformly in the microfibers. X-ray diffraction （XRD） displayed the characteristic diffraction peaks of silver nanoparticles in microfibers and FTIR test proved that there was an interaction between PVA and silk fibroin stabilized silver nanoparticles after blending