Three kinds of titanium surface especially the HA surface are analyzed. Titanium was treated by 3 kinds of methods that were acid & alkali, calcic solution and apathe solution. Samples were observed by optic micros...Three kinds of titanium surface especially the HA surface are analyzed. Titanium was treated by 3 kinds of methods that were acid & alkali, calcic solution and apathe solution. Samples were observed by optic microscope and atomic force microscope ( AFM ) . The typical surface morphology of the acid and alkali group is little holes, and on the two HA surface the tiny protuberances is typical. The surface treated by apatite solution was smoother than the two formers. The rough surface treated with acid and alkali was propitious to Ca^+ , P^- and proteins' adhesion, and the relatively smooth HA surface was of benefit to the cell adhesion.展开更多
煤体自身力学性质对瓦斯动力灾害的发生具有重要的影响,为进一步研究软煤和硬煤微观差异性,采用原子力显微镜(AFM)内置PF-QNM模式对两种不同硬度煤样表面进行扫描,结果表明:软煤和硬煤微观形貌及力学性质存在较大差异,软煤表面粗糙度明...煤体自身力学性质对瓦斯动力灾害的发生具有重要的影响,为进一步研究软煤和硬煤微观差异性,采用原子力显微镜(AFM)内置PF-QNM模式对两种不同硬度煤样表面进行扫描,结果表明:软煤和硬煤微观形貌及力学性质存在较大差异,软煤表面粗糙度明显大于硬煤,微观表面起伏较小,但波峰数量较多,可为气体吸附提供较多吸附点位。不同煤样扫描区域内表面弹性模量和粘附力均符合正态分布。受构造作用和变质程度的影响,其微观结构排列较为紧密,弹性模量整体表现为大于硬煤。不同煤样微观力学性质均表现出明显的非均质性,煤体表面具有一定的粘附力,具有突出倾向的软煤表面粘附力大多集中在0~100 nN,硬煤表面粘附力大多集中在100~400 n N,软煤的最大引力作用距离d0要明显小于硬煤。在应力扰动或压力梯度作用下,气体容易发生快速解吸,容易导致煤与瓦斯突出事故。展开更多
原子力显微镜(Atomic force microscopes,AFM)接触模式下的测量结果因受样本表面倾角和针尖—样本表面间摩擦力的影响而存在较大的测量误差。为避免针尖—表面间的摩擦力对AFM测量试样表面形貌的影响,并能够准确测量表面倾角,提出了一...原子力显微镜(Atomic force microscopes,AFM)接触模式下的测量结果因受样本表面倾角和针尖—样本表面间摩擦力的影响而存在较大的测量误差。为避免针尖—表面间的摩擦力对AFM测量试样表面形貌的影响,并能够准确测量表面倾角,提出了一种新的AFM工作模式——消除倾角和摩擦力影响模式。在这种工作模式中,扫描方向垂直悬臂的长轴方向,通过测量悬臂的竖向和横向偏转而得到针尖所受的竖向和横向力,并计算得到针尖—试样表面间的vander Waals力及试样表面局部倾角,然后结合针尖顶点和扫描器的位置及针尖—试样表面间距可以得到试样表面形貌的测量结果。在上述工作模式下,针尖—试样表面间的摩擦力是可控的,能够避免针尖或试样的损伤。仿真结果证明了这种方法的可行性。展开更多
文摘Three kinds of titanium surface especially the HA surface are analyzed. Titanium was treated by 3 kinds of methods that were acid & alkali, calcic solution and apathe solution. Samples were observed by optic microscope and atomic force microscope ( AFM ) . The typical surface morphology of the acid and alkali group is little holes, and on the two HA surface the tiny protuberances is typical. The surface treated by apatite solution was smoother than the two formers. The rough surface treated with acid and alkali was propitious to Ca^+ , P^- and proteins' adhesion, and the relatively smooth HA surface was of benefit to the cell adhesion.
文摘煤体自身力学性质对瓦斯动力灾害的发生具有重要的影响,为进一步研究软煤和硬煤微观差异性,采用原子力显微镜(AFM)内置PF-QNM模式对两种不同硬度煤样表面进行扫描,结果表明:软煤和硬煤微观形貌及力学性质存在较大差异,软煤表面粗糙度明显大于硬煤,微观表面起伏较小,但波峰数量较多,可为气体吸附提供较多吸附点位。不同煤样扫描区域内表面弹性模量和粘附力均符合正态分布。受构造作用和变质程度的影响,其微观结构排列较为紧密,弹性模量整体表现为大于硬煤。不同煤样微观力学性质均表现出明显的非均质性,煤体表面具有一定的粘附力,具有突出倾向的软煤表面粘附力大多集中在0~100 nN,硬煤表面粘附力大多集中在100~400 n N,软煤的最大引力作用距离d0要明显小于硬煤。在应力扰动或压力梯度作用下,气体容易发生快速解吸,容易导致煤与瓦斯突出事故。
文摘原子力显微镜(Atomic force microscopes,AFM)接触模式下的测量结果因受样本表面倾角和针尖—样本表面间摩擦力的影响而存在较大的测量误差。为避免针尖—表面间的摩擦力对AFM测量试样表面形貌的影响,并能够准确测量表面倾角,提出了一种新的AFM工作模式——消除倾角和摩擦力影响模式。在这种工作模式中,扫描方向垂直悬臂的长轴方向,通过测量悬臂的竖向和横向偏转而得到针尖所受的竖向和横向力,并计算得到针尖—试样表面间的vander Waals力及试样表面局部倾角,然后结合针尖顶点和扫描器的位置及针尖—试样表面间距可以得到试样表面形貌的测量结果。在上述工作模式下,针尖—试样表面间的摩擦力是可控的,能够避免针尖或试样的损伤。仿真结果证明了这种方法的可行性。