Polyacrylonitrile (PAN), cellulose acetate (CA), PAN-TiO₂, and CA-TiO₂ nanofibers were prepared using the electrospinning technique under varying the loading of the TiO₂ nanoparticles. The latter TiO₂ nanoparticles were prepared using the sol-gel method by varying the calcination temperatures. The absorption and emission spectra illustrated the formation of TiO₂ nanoparticles with an increase in absorption band edges with smaller particles. The TEM results showed the spherical morphology of the nanoparticles calcined at 500°C with an average diameter of . XRD analysis revealed anatase phase as the dominant crystalline phase of the nanoparticles. TiO₂ nanoparticle loadings of 0.2 and 0.4 wt% were incorporated into 16 wt% CA solutions while 1, 2, and 3 wt% of TiO₂ nanoparticles were incorporated into 10 wt% PAN solutions. The SEM results illustrated the lowering in diameter and morphology of the nanofibers upon incorporation of nanoparticles. Their respective average diameters are 220, 338, 181, and 250 nm for PAN, CA, PAN-TiO₂, and CA-TiO₂ polymer fibers, respectively. The morphology of the nanofibers improved while the diameter increased with an increase in polymer concentration. Different loadings of TiO₂ nanoparticles improved the electrospinnability and morphology and further decreased the size of the nanofibers. FTIR spectroscopy signifies the formation of nanocomposites and the presence of TiO₂ nanoparticles which corresponded to the Ti-O stretching and Ti-O-Ti bands on the FTIR spectra.

中文翻译：

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TiO2纳米粒子在电纺聚丙烯腈和醋酸纤维素聚合物纤维中的最佳负载量

聚丙烯腈（PAN），醋酸纤维素（CA），PAN-TiO ₂和CA-TiO ₂纳米纤维是使用静电纺丝技术在改变TiO ₂纳米粒子的负载量的条件下制备的。使用溶胶-凝胶法通过改变煅烧温度来制备后一种TiO ₂纳米颗粒。吸收和发射光谱说明了随着较小颗粒的吸收带边缘的增加，TiO ₂纳米颗粒的形成。TEM结果表明，在500°C下煅烧的纳米颗粒的球形形态为。XRD分析显示锐钛矿相为纳米颗粒的主要结晶相。将0.2和0.4重量％的TiO ₂纳米颗粒负载量掺入16重量％的CA溶液中，而将1、2和3重量％的TiO ₂纳米颗粒掺入10重量％的PAN溶液中。SEM结果表明，掺入纳米颗粒后纳米纤维的直径和形态降低。对于PAN，CA，PAN-TiO ₂和CA-TiO ₂聚合物纤维，它们各自的平均直径分别为220、338、181和250 nm。纳米纤维的形态得到改善，而直径随着聚合物浓度的增加而增加。TiO ₂的含量不同纳米颗粒改善了电纺性和形态，并进一步减小了纳米纤维的尺寸。FTIR光谱表示纳米复合材料的形成和TiO ₂纳米颗粒的存在，这与FTIR光谱上的Ti-O拉伸和Ti-O-Ti谱带相对应。