This work reports the morphology, crystal size, and shape variations of nanoparticles, including manganese dioxide- MnO₂ during in situ synthesis in biopolymer. In this context, stable nanocomposite based on sodium alginate (Alg) – MnO₂ were produced in different solutions by changing the reaction conditions. Then the host polymer, Alg was removed via calcination to obtain neat nanoflakes. The chemical, thermal, morphology, and structural properties as well as porosity of pure MnO₂, Alg-MnO₂, and calcinated products were investigated using scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X‐ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), Brunauer-Emmett-Teller (BET), and Fourier transform infrared spectroscopy (FT-IR). It was clearly demonstrated that the presence different solvents, polymer, and the pH variations affected noticeably on the crystal structures of the samples. Additionally, nanorods monodispersed particles with length and width around 200 and 7–10 nm were produced without Alg in isopropanol. Whereas, in the same condition, the morphology of MnO₂ changed to nanoflakes structures in the existence of Alg and size diminished to quarter (50 nm) of the pristine material. A further decrease in the nanoflake size was observed in the neural pH, acidic and basic environmental conditions with Alg route.

这项工作报道了生物聚合物原位合成过程中纳米颗粒的形态，晶体大小和形状变化，包括二氧化锰-MnO ₂。在这种情况下，通过改变反应条件，可以在不同溶液中生成基于藻酸钠（Alg）-MnO _2的稳定纳米复合材料。然后通过煅烧除去主体聚合物Alg以获得纯净的纳米薄片。纯MnO ₂，Alg-MnO ₂的化学，热学，形貌和结构性质以及孔隙率，并使用扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射（XRD），热重分析（TGA），差热分析（​​DTA），Brunauer-Emmett-Teller（BET）对煅烧产物进行了研究，以及傅立叶变换红外光谱（FT-IR）。清楚地表明，不同溶剂，聚合物和pH值的存在对样品的晶体结构有显着影响。另外，在异丙醇中，在没有Alg的情况下，生产了长和宽约为200和7-10 nm的纳米棒单分散颗粒。而在相同条件下，MnO ₂的形貌在存在Alg的情况下变为纳米薄片结构，尺寸减小到原始材料的四分之一（50 nm）。纳米薄片的尺寸在神经pH，酸性和碱性环境条件下通过Alg途径进一步减小。