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Abstract：
Cellulose nanofibers (CNFs) were used to improve the electrospinnability of the gelatin protein in a water/ethanol/acetic acid (3:2:3, v/v) solution. The effects of different concentrations of CNFs (0.5-4%) on the important physical properties of the gelatin solution (15%), including rheology, conductivity, and surface tension, were investigated. The apparent viscosity and shear-thinning behavior were increased by increasing the CNF concentration from 0 to 4% at a low shear rate (<10 s-1). CNFs also increased the electrical conductivity and surface tension of the gelatin solution. Scanning electron microscopy (SEM) images revealed uniformly ordered structures with good continuity without fracture or bead formation in all hybrid nanofibers. They also showed that the average diameters of fibers decreased from 216 nm in the pure gelatin nanofibers to 175.39 nm in the hybrid gelatin/CNF (4%) ones. Differential scanning calorimetry (DSC) results showed that CNFs increased Tg, and X-ray diffraction (XRD) analysis showed that the electrospinning process caused the formation of more amorphous structures in the gelatin/CNF hybrid nanofibers. The tensile test indicated that by adding 2% CNFs, the ultimate tensile strength (UTS) and strain at break (SB) of nanofiber mats increased from 4.26 to 10.5 MPa and 3.3% to 6.25%, respectively. The current study indicated that incorporating CNFs at the optimal concentration into a gelatin solution can improve the resulting hybrid nanofibers\' morphology, average diameter, and mechanical properties.
摘要：
纤维素纳米纤维（CNF）用于改善明胶蛋白在水/乙醇/乙酸（3：2：3，v/v）溶液中的电纺能力。分歧浓度的CNFs(0.5-4%)对明胶溶液(15%)重要物理性质的影响,包括流变学,电导率，和表面张力，被调查了。通过在低剪切速率（<10s-1）下将CNF浓度从0增加到4％，表观粘度和剪切稀化行为得以增加。CNF还增加了明胶溶液的电导率和表面张力。扫描电子显微镜（SEM）图像显示出均匀有序的结构，具有良好的连续性，在所有混合纳米纤维中都没有断裂或珠粒形成。他们还表明，纤维的平均直径从纯明胶纳米纤维的216nm降低到混合明胶/CNF（4％）的175.39nm。差示扫描量热法(DSC)结果表明,X射线衍射（XRD）分析表明，静电纺丝过程导致明胶/CNF杂化纳米纤维形成更多的无定形结构。拉伸试验表明，通过添加2%CNFs，纳米纤维垫的极限拉伸强度（UTS）和断裂应变（SB）从4.26增加到10.5MPa和3.3％增加到6.25％，分别。目前的研究表明，以最佳浓度将CNFs掺入明胶溶液可以改善所得混合纳米纤维的形态，平均直径,和机械性能。
