Abstract

The present study enabled green synthesis and characterization of starch-functionalized magnetic nanoparticles to be released by the chemical co-precipitation of magnetite phase from aqueous solution in a different type of polymeric starch matrix (corn and wheat). To examine the structural changes which would occur when preparing starch-functionalized magnetic nanocomposites, the parameters which affect the synthesis such as starch type, the concentration of the precipitating agent, and aging time were studied. SEM/EDX, TEM, XRD, FTIR, VSM, and zeta potential measurements were employed to characterize and compare the as-synthesized products. The calculations based on the XRD results showed that magnetic starch nanocomposites had well-defined nanocomposite structures and average sizes of approximately 4.55 ± 1.2 nm and 3.78 ± 1.2 nm, respectively. Furthermore, the size varies from 7.95 ± 1.2 nm to 4.55 ± 1.2 nm and 6.91 ± 1.2 nm to 3.78 ± 1.2 nm by changing starch concentration from 0.05% to 2% for wheat and corn starches, respectively. The BET surface area of starch-stabilized magnetite nanobiocomposites for MW_S3 and MC_S3 were found to be 126.20 and 151.29 m²/g, respectively. The TEM and SEM results indicated that the spherical nanoparticles were dispersed into the polymer matrix. VSM results of pure-Fe₃O₄ (44.63 emu/g) is higher than those of MW_S3 (41.20 emu/g) and MC_S3 (39.88 emu/g) based on starch functionalization.

摘要

本研究通过在不同类型的聚合淀粉基质（玉米和小麦）中从水溶液中化学共沉淀磁铁矿相来释放淀粉功能化磁性纳米粒子的绿色合成和表征。为了研究淀粉功能化磁性纳米复合材料制备过程中可能发生的结构变化，研究了影响合成的参数，如淀粉类型、沉淀剂浓度和老化时间。SEM/EDX、TEM、XRD、FTIR、VSM 和 zeta 电位测量用于表征和比较合成后的产品。基于 XRD 结果的计算表明，磁性淀粉​​纳米复合材料具有明确的纳米复合材料结构，平均尺寸分​​别约为 4.55 ± 1.2 nm 和 3.78 ± 1.2 nm。此外，通过将小麦和玉米淀粉的淀粉浓度分别从 0.05% 更改为 2%，尺寸从 7.95 ± 1.2 nm 到 4.55 ± 1.2 nm 和 6.91 ± 1.2 nm 到 3.78 ± 1.2 nm 不等。MW_S3 和 MC_S3 的淀粉稳定磁铁矿纳米复合材料的 BET 表面积分别为 126.20 和 151.29 m² /g，分别。TEM和SEM结果表明球形纳米颗粒分散在聚合物基质中。基于淀粉功能化的纯Fe ₃ O ₄ (44.63 emu/g)的VSM结果高于MW_S3 (41.20 emu/g)和MC_S3 (39.88 emu/g)。