Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China; Tianjin and Ministry of Education Key Laboratory for Advanced Textile Composite Materials, Tianjin Polytechnic University, Tianjin 300387, China.
Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Mater Sci Eng C Mater Biol Appl. 2019 Dec;105:110062. doi: 10.1016/j.msec.2019.110062. Epub 2019 Aug 8.
In this study, ultrasonic-assisted electrodeposition is used to prepare uniform and smooth hydroxyapatite (HA) coating on the surface of the braids, which can be potentially applied as biodegradable bone scaffolds. During the electro-deposition process, the ultrasonic power (0 W and 20 W) and current density (2.5, 5.0, and 7.5 mA/cm) are altered in order to evaluate their influences on the properties of HA coating over the braid surface. The field emission scanning electron microscope (FE-SEM) images show that the crystals growth stages of HA include spherical particles, plate-like and needle-like crystals when electro-deposited for 15, 30, 45, and 60 min. In particular, when electro-deposited for 60 min, the needle-like structure of HA coatings shows a significant increase in density as a result of increasing the current density or the employment of ultrasonic treatment. Transmission electron microscope (TEM) results show that when the current density increases from 2.5 mA/cm to 7.5 mA/cm, the grain size decreases from 413.65 ± 63.12 nm to 264.56 ± 65.33 nm. With the aid of ultrasonic treatment, the HA coating demonstrates a calcium‑phosphorus (Ca/P) ratio that resembles that of the human skeleton being 1.67. The X-ray Diffraction (XRD) results show the highest crystallinity reaches 73.52% at 7.5 mA/cm-20 W. The cavitation effect of ultrasonic can improve the roughness of HA coating distinctively. Finally, the 7-day immersion into simulated body fluid (SBF) demonstrated a denser and finer apatite precipitation on the HA coating fabricated by ultrasonic-assisted electrodeposition. Therefore, this study provides a feasible ultrasonic-assisted electrodeposition method that yields a good morphology of bioactive substances coating over braid or other rugged deposition substrate for potential degradable bone scaffolds.
在这项研究中，采用超声辅助电沉积技术在编织物表面制备均匀、光滑的羟基磷灰石（HA）涂层，该涂层有望作为可生物降解的骨支架。在电沉积过程中，改变超声功率（0 W 和 20 W）和电流密度（2.5、5.0 和 7.5 mA/cm2），以评估它们对编织物表面 HA 涂层性能的影响。场发射扫描电子显微镜（FE-SEM）图像显示，当电沉积 15、30、45 和 60 min 时，HA 晶体生长阶段包括球形颗粒、板状和针状晶体。特别是，当电沉积 60 min 时，由于电流密度的增加或超声处理的使用，HA 涂层的针状结构的密度显著增加。透射电子显微镜（TEM）结果表明，当电流密度从 2.5 mA/cm 增加到 7.5 mA/cm 时，晶粒尺寸从 413.65±63.12 nm 减小到 264.56±65.33 nm。在超声处理的辅助下，HA 涂层表现出与人体骨骼相似的钙磷（Ca/P）比为 1.67。X 射线衍射（XRD）结果表明，在 7.5 mA/cm20 W 时，结晶度最高可达 73.52%。超声空化效应可以显著提高 HA 涂层的粗糙度。最后，7 天浸入模拟体液（SBF）中显示，在超声辅助电沉积制备的 HA 涂层上形成了更致密、更细小的磷灰石沉淀。因此，本研究提供了一种可行的超声辅助电沉积方法，可在编织物或其他粗糙沉积基底上获得具有良好形态的生物活性物质涂层，用于潜在的可降解骨支架。
