Abstract Electrophoretic deposition (EPD) was performed from alcoholic suspensions of spherical (SHA) and fiber (FHA) hydroxyapatite nanoparticles. FHA particles were horizontally aligned in deposits prepared at lower voltages since they can find enough space and time to rotate upon reaching the deposit and sit horizontally on it. While, they are more randomly oriented at higher voltages since more FHA particles aligned parallel to electric field reach to the substrate and also particles cannot find enough time and space for rotation. FHA particles are highly interlocked together in FHA deposits reinforcing them and also the drying shrinkages are lower for them resulting in their less cracking. The cracks are parallel to each other in FHA coating deposited from methanolic suspension at 5 V due to the more horizontal and parallel alignment of FHA particles in it. The crack-free SHA coating decreased the corrosion rate of substrate more efficiently due to its less porosity.

中文翻译：

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形貌对羟基磷灰石纳米粒子电泳沉积的影响

摘要 电泳沉积 (EPD) 是由球形 (SHA) 和纤维 (FHA) 羟基磷灰石纳米颗粒的醇悬浮液进行的。FHA 颗粒在较低电压下制备的沉积物中水平排列，因为它们可以找到足够的空间和时间在到达沉积物时旋转并水平放置在其上。同时，它们在更高的电压下更随机地取向，因为更多的 FHA 粒子平行于电场排列到达基板，而且粒子也找不到足够的时间和空间进行旋转。FHA 颗粒在 FHA 沉积物中高度互锁在一起，增强了它们的作用，而且它们的干燥收缩率较低，因此开裂较少。由于 FHA 颗粒在其中更水平和平行排列，在 5 V 的甲醇悬浮液沉积的 FHA 涂层中裂纹彼此平行。无裂纹的 SHA 涂层由于其孔隙率较小而更有效地降低了基材的腐蚀速率。