The shape, porosity, and surface hydrophilicity of hematite particles formed from a forced hydrolysis reaction of acidic FeCl3 solution were controlled by using a trace of polymers (0.001 and 0.003 wt%). The spherical particles were produced on the systems with polyvinyl alcohol (PVA) and polyaspartic acid (PAS). In the case of polyacryl amide (PAAm), slightly small spherical particles were precipitated at 0.003 wt%. However, polyacrylic acid (PAAc) and poly-γ-glutamic acid (PGA) gave ellipsoidal particles. This morphological change on hematite particles depended on the order of functional groups of polymers as –OH<–CONH2<–COOH<–COOH and ⟩C=O, corresponding to the order in extent of polymer molecules for complexation to Fe3+ ions and adsorption onto particle surface. Accompanying this order, the hematite particles produced were changed from less porous to microporous. On the other hand, only the system with 0.003 wt% of PAAm produced mesoporous hematite particles. Choosing the kinds of polymers also controlled the ultramicroporosity and surface hydrophilicity of the particles.

中文翻译：

---

利用聚合物控制赤铁矿颗粒的形状、孔隙率和表面亲水性

通过使用微量聚合物（0.001 和 0.003 wt%）控制由酸性 FeCl3 溶液强制水解反应形成的赤铁矿颗粒的形状、孔隙率和表面亲水性。球形颗粒是在含有聚乙烯醇 (PVA) 和聚天冬氨酸 (PAS) 的系统上生产的。在聚丙烯酰胺 (PAAm) 的情况下，以 0.003 wt% 的量沉淀出略小的球形颗粒。然而，聚丙烯酸 (PAAc) 和聚-γ-谷氨酸 (PGA) 会产生椭圆形颗粒。赤铁矿颗粒的这种形态变化取决于聚合物官能团的顺序，如–OH<–CONH2<–COOH<–COOH 和⟩C=O，对应于聚合物分子与 Fe3+ 离子络合并吸附到颗粒表面。伴随着这个命令，产生的赤铁矿颗粒从少孔变为微孔。另一方面，只有含有 0.003 wt% PAAm 的系统才能产生介孔赤铁矿颗粒。选择聚合物的种类还控制了颗粒的超微孔率和表面亲水性。