An AFM investigation of the mesostructure of Fe-based nanocrystalline ribbon

The mesostructure at the cross section of the Fe-based nanocrystalline (Fe73.5Cu1Nb3Si13.5B9) ribbon was observed with atomic force microscopy (AFM). An apparent mesostruetural difference was found between the sticking roller face area (SRFA) and the free face area (FFA) of the ribbon crystallized after annealing. In SRFA there is a preponderance of rough grain gathering in longitudinal arrangement, while in FFA a fine grain gathering arranged transversely dominates. This phenomenon could be due to the different residual stress remained in the different areas of the amorphous ribbon resulting from the single-roller quenching technique.     

Probing molecular interaction between transferrin and anti-transferrin by atomic force microscope

ATOMIC FORCE MICROSCOPY(AFM)IS A POWERFUL TOOL FOR STUDYING BIOMACROMOLECULAR STRUCTURE AND THEIR IN-TERACTION WITH A RESOLUTION AT THE NANOMETER LEVEL IN PHYSIOLOGY-LIKE SITUATION.THE INTERACTIONS BETWEEN LIGAND AND RECEPTOR,ANTIGEN AND ANTIBODY,AND INTE…     

苏云金芽孢杆菌伴胞晶体蛋白提取方法比较研究

采用液体双相分层法和等电点沉淀法提取苏云金芽孢杆菌伴胞晶体蛋白.原子力显微镜观测,发现液体双相分层提取的晶体蛋白具有完整典型的晶体结构;等电点法提取的得率高,不能检测到完整的晶体结构.聚丙烯酰胺凝胶电泳分析,等电点法提取的蛋白质含量是液体双相法提取的蛋白含量的1~2倍.将2种方法提取的晶体蛋白对初孵棉铃虫幼虫生物测定均表现杀虫生物活性,经统计分析,液体双相法提取的蛋白质生测毒力比等电点法的高1.5~3倍.     

低温自蔓延燃烧法制备纳米Sm2O3

将溶胶-凝胶法（sol—gel）和低温燃烧技术（LCS）相结合，成功开发了一种以溶胶-凝胶为前驱体的燃烧合成Sm2O3纳米粉体的技术．利用XRD，TEM，AFM等方法对合成产物进行了表征，并考察了制备条件对Sm2O3纳米粉体尺寸和形貌的影响．     

Alignment Mechanism of Liquid Crystal Molecules on the Fluorated Polyimide Surface

ＡｌｉｇｎｍｅｎｔＭｅｃｈａｎｉｓｍｏｆＬｉｑｕｉｄＣｒｙｓｔａｌＭｏｌｅｃｕｌｅｓｏｎｔｈｅＦｌｕｏｒａｔｅｄＰｏｌｙｉｍｉｄｅＳｕｒｆａｃｅ＊ＸｕＳｈｏｕｙｉ（徐寿颐），ＬｉＺｈｉｊｕｎ（李志军）ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｔｓｉ...     

Nd_2Fe_(14)C/α-Fe系稀土永磁材料微观组织及磁性能

为了提高纳米双相稀土永磁材料Nd2Fe14B/α-Fe的性能,研究了一种新型合金Nd9.0Fe85.5Nb1.0B4.0C0.5。在合金中添加碳可提高矫顽力,添加钕可细化晶粒;合金的淬态微观组织显著影响其磁性能,合金中的部分预析出微晶相有助于在随后的热处理中获得均匀的微观组织;在热处理工艺中,晶化退火温度和时间对合金微观组织结构具有显著影响,并影响合金的磁性能。使用原子力/磁力显微镜观察Nd-Fe-(BC)/α-Fe纳米复合磁体的微观组织及磁畴结构,并由此对纳米双相稀土永磁材料中的交换耦合作用进行了解释。结果表明,最佳热处理工艺为:700℃保温15min,其性能为:剩磁1.381Wb.m-2,矫顽力518.05kA.m-1,剩磁比0.74,最大磁能积137.75kJ.m-3。     

Pulse gas alignment and AFM manipulation of single-wall carbon nanotube

In the fabrication process of nanoelectronic device arrays based on single-wall carbon nanotube （SWCNT）, oriented alignment of SWCNTs and property modification of metallic SWCNTs in the array are the key problems to be solved. Pulse gas alignment with substrate downward tilt is proposed to realize the controllable alignment of SWCNTs. Experimental results demonstrate that 84% SWCNTs are aligned in -15°- 15° angular to the pulse gas direction. A modified nanomanipulation technology based on atomic force microscope （AFM） is utilized to perform various kinds of SWCNT manipulation, such as SWCNT separation from the ＂Y＂ CNT, catalyst removal from the SWCNT end, continual nano buckles fabrication on SWCNT and even stretching to break, which provides a feasible way to modify the size, shape and the electrical property of SWCNTs.     

多孔硅薄膜的微结构及其XRD研究

使用扫描电子显微镜、原子力显微镜和X射线衍射研究了多孔硅薄膜的微结构.SEM图像显示：多孔硅膜表面的微结构比较均匀;沿纵向方向薄膜内部空腔呈流线型分布;孔和孔之间的间距为10～20 nm.AFM形貌表明：其表面在1×1μm范围内的均方根粗糙度为4.75 nm.XRD结果说明：多孔硅薄膜晶体晶格常数随深度增加而变大,多孔硅薄膜孔壁上Si？H键的比例将减少.     

Application of image alignment and time averaging methods in AFM detection for single DNA molecules

Enhancement of the SNR (signal to noise ratio) in single-molecule imaging is significantly important for improving image resolu-tion and distinguishing the fine structures of single molecules at a higher precision level.Image processing techniques have dem-onstrated the remarkable capability to improve the SNR and the resolution level by breaking through some inherent limitations unresolved by instrument hardware optimization.In this paper, we focus on single-biomolecule imaging using atomic force mi-crosco...