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Improving fluid retention properties of 316L stainless steel using nanosecond pulsed laser surface texturing
Journal of Laser Applications ( IF 2.1 ) Pub Date : 2020-11-01 , DOI: 10.2351/7.0000199
Mahmood Al Bashir 1 , Rajeev Nair 1 , Martina M. Sanchez 2 , Anil Mahapatro 2
Affiliation  

Stainless steel has been used as a successful biomaterial for decades. In this study, a pulsed nanosecond laser was used to create patterned surfaces of stainless steel coupons to study the effect of patterning on fluid retention and biocompatibility studies of laser patterned and control surfaces. An AVIA 355 nanosecond pulsed laser was used with different laser parameters to create unique “peak and valley” structures (uniform textured surface) on stainless steel coupons of size of 1 × 1 × 0.1 cm3. The surface structural changes can be attributed to the Gaussian beam profile of the laser. The coupons were observed under a scanning electron microscope to understand the change of the material surface profile. An optical profilometer was used to measure the surface roughness and compare it with a nontextured or control surface. The contact angle measurement showed a decrease in the contact angle, reduced to 71.6° from 82.2° making the patterned surface more hydrophilic. A biocompatibility study of the stainless steel was performed to evaluate the effect of surface modification on its impact on biocompatibility. The cell viability of the patterned sample was 94% as compared to 84% for the unpatterned surface. A simulation of the process was run using flow3d® to understand the behavior of the material during the texturing process. The results obtained from the simulation process were compared with the experimental data and found to be in good agreement. The effects of Gaussian beam, vapor pressure, and overlapping of the beam were also analyzed in the simulation process.

中文翻译:

使用纳秒脉冲激光表面纹理改善 316L 不锈钢的流体保留性能

数十年来,不锈钢一直被用作一种成功的生物材料。在这项研究中,脉冲纳秒激光用于创建不锈钢试样的图案化表面,以研究图案化对激光图案化和控制表面的流体保留和生物相容性研究的影响。使用 AVIA 355 纳秒脉冲激光器和不同的激光参数,在尺寸为 1 × 1 × 0.1 cm3 的不锈钢试样上创建独特的“峰谷”结构(均匀纹理表面)。表面结构变化可归因于激光器的高斯光束轮廓。在扫描电子显微镜下观察试样,以了解材料表面轮廓的变化。使用光学轮廓仪测量表面粗糙度并将其与无纹理或对照表面进行比较。接触角测量显示接触角减小,从 82.2° 降低到 71.6°,使图案化表面更具亲水性。对不锈钢进行了生物相容性研究,以评估表面改性对其生物相容性影响的影响。图案化样品的细胞活力为 94%,而未图案化表面的细胞活力为 84%。使用 flow3d® 运行该过程的模拟,以了解材料在纹理化过程中的行为。从模拟过程中获得的结果与实验数据进行了比较,发现吻合良好。在仿真过程中还分析了高斯光束、蒸汽压力和光束重叠的影响。2° 使图案化表面更具亲水性。对不锈钢进行了生物相容性研究,以评估表面改性对其生物相容性影响的影响。图案化样品的细胞活力为 94%,而未图案化表面的细胞活力为 84%。使用 flow3d® 运行该过程的模拟,以了解材料在纹理化过程中的行为。从模拟过程中获得的结果与实验数据进行了比较,发现吻合良好。在仿真过程中还分析了高斯光束、蒸汽压力和光束重叠的影响。2° 使图案化表面更具亲水性。对不锈钢进行了生物相容性研究,以评估表面改性对其生物相容性影响的影响。图案化样品的细胞活力为 94%,而未图案化表面的细胞活力为 84%。使用 flow3d® 运行该过程的模拟,以了解材料在纹理化过程中的行为。从模拟过程中获得的结果与实验数据进行了比较,发现吻合良好。在仿真过程中还分析了高斯光束、蒸汽压力和光束重叠的影响。图案化样品的细胞活力为 94%,而未图案化表面的细胞活力为 84%。使用 flow3d® 运行该过程的模拟,以了解材料在纹理化过程中的行为。从模拟过程中获得的结果与实验数据进行了比较,发现吻合良好。在仿真过程中还分析了高斯光束、蒸汽压力和光束重叠的影响。图案化样品的细胞活力为 94%,而未图案化表面的细胞活力为 84%。使用 flow3d® 运行该过程的模拟,以了解材料在纹理化过程中的行为。从模拟过程中获得的结果与实验数据进行了比较,发现吻合良好。在仿真过程中还分析了高斯光束、蒸汽压力和光束重叠的影响。
更新日期:2020-11-01
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