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1.
采用射频磁控溅射法,以聚四氟乙烯(PT-FE)为靶,氩气为载气,在再生纤维素基底上制备了氟碳膜.用原子力显微镜(AFM)、X射线光电子能谱(XPS)和静态接触角测试仪对氟碳膜的表面形貌、表面结构和表面性能进行了研究.结果表明,该法制得的氟碳膜是由纳米粒子组成的岛状结构,岛的表面起伏不平.这种氟碳膜由-CF3-CF2-、...  相似文献   

2.
用原子力显微镜AFM、光电子能谱仪XPS等研究了组装在再生纤维素基质(cel)表面的N-β-氨乙基-γ-氨丙基聚二甲基硅氧烷(ASO-1)的膜形貌、表面相化学组成及疏水性.结果发现,受基质表面不平整性的影响,组装在cel表面的氨基硅膜(ASO-1/cel),微观上会表现出一种类似于基质的粗糙形貌.而XPS分析和接触角测定结果表明,ASO-1/cel表面强烈疏水,在其表层明显存在由氨基硅ASO-1所产生的Si2p、Cls、Nls和Ols XPS峰.据此推测,ASO-1在cel表面的定向排列成膜方式为:硅甲基朝外伸向空气、Si-O偶极键以及极性氨基指向基质界面.  相似文献   

3.
以再生纤维素作基质,在其表面组装了N-环己基-γ-氨丙基聚二甲基硅氧烷(ASO-702),分别用X射线光电子能谱(XPS)、原子力显微镜(AFM)以及接触角测定仪对ASO-702的膜形貌进行了观察和表征.结果表明,在再生纤维素基质表面,氨基硅ASO-702能形成均一相疏水膜,该膜能有效降低再生纤维基质表面的粗糙度.XPS和接触角测定仪对纤维表面分析的结果表明,在处理后的棉纤维表层确有ASO-702硅膜存在,而且该膜疏水,接触角达到91.5°.从而进一步证明了氨基硅在纤维表面的定向排列成膜方式为:硅甲基朝外、Si-O偶极键及阳离子化氨基指向纤维表面.  相似文献   

4.
利用微纳纤维素晶体改性戊二醛交联的聚乙烯醇渗透汽化膜,考察了微纳纤维素晶体的添加对交联膜的影响,并对膜材料进行FT-IR和AFM检测。结果表明,添加0.5%的微纳纤维素晶体改性膜材料的渗透通量从423.14g.m2.h-1提高到751.61g.m2.h-1,分离因子基本不变;对膜材料进行FT-IR和AFM检测表明,微纳纤维素晶体与聚乙烯醇之间产生新的氢键缔合,改性膜材料表面规整、致密无孔。  相似文献   

5.
研究了一种拟用于SPR生物传感器的生物材料.为此,首先在金膜表面制备聚丙烯酰吡咯(PAP)膜,然后对膜的结构和表面形貌进行了研究.其中,制备PAP的方法是以丙烯酰氯和吡咯钾盐合成丙烯酰吡咯,然后以偶氮二异丁腈(AIBN)为引发剂,进行自由基聚合;金膜表面制备PAP膜的方法是:PAP溶于N,N-二甲基甲酰胺(DMF),然后旋涂到金膜上;最后,涂膜表面与吡咯在三氯化铁溶液中化学法聚合,形成聚合吡咯层.红外光谱可以看出,所得聚合物就是需要的产品;AFM非原位表面形貌图像和三维立体形貌图上显示,涂膜覆盖了金膜表面原有的小孔,表面粗糙度比纯金膜增大.  相似文献   

6.
采用磁控溅射法,以聚四氟乙烯(PTFE)为靶,氩气为栽气,在再生纤雏素膜表面沉积氟碳(FC)膜.用扫描电镜(SEM)、原子力显微镜(AFM)、红外光谱仪(FT-IR)和静态接触角测试仪对氟碳膜的表面形貌、表面结构和表面性能进行了研究,结果表明:随着溅射压力的增加,沉积的FC粒子数量增多,粒径变小,覆盖度增加;随着沉积时间的增加,FC膜逐渐变厚,FC膜由-CF3、-CF2-、-CF-和-C-4种组分组成.沉积FC膜后,再生纤维素膜实现了由亲水性向疏水性的转变.  相似文献   

7.
研究了一种拟用于SPR生物传感器的生物材料.为此,首先在金膜表面制备聚丙烯酰吡咯膜,然后对膜的结构和表面形貌进行了研究.其中,制备聚丙烯酰吡咯(PAP)的方法是以丙烯酰氯和吡咯钾盐合成丙烯酰吡咯,然后以偶氮二异丁腈(AIBN)为引发剂,进行自由基聚合;金膜表面制备PAP膜的方法是:PAP溶于N,N-二甲基甲酰胺(DMF),然后旋涂到金膜上;最后,涂膜表面与吡咯在三氯化铁溶液中化学法聚合,形成聚合吡咯层.红外光谱可以看出,所得聚合物物质就是需要的产品;AFM非原位表面形貌图像和三维立体形貌图上显示涂膜覆盖了金膜表面原有的小孔,表面粗糙度比纯金膜增大.  相似文献   

8.
纳米SiO_2/纤维素包装薄膜结构形态及性能研究   总被引:6,自引:5,他引:1  
采用具有活性基团的硅烷偶联剂KH550(γ-氨丙基三乙氧基硅烷)对纳米SiO2粒子的表面进行改性。以NMMO为溶剂,以纤维素为原料,并向铸膜液中添加改性纳米SiO2,制备改性纳米SiO2/纤维素膜。采用原子力显微镜(AFM)观察了改性纳米SiO2/纤维素薄膜的表面形态,结合电子显微镜(SEM)观察其断面结构,并测定了薄膜的力学性能和透氧透湿性能。实验结果表明:改性后的SiO2较好的在铸膜液中分散,当SiO2粒径为30nm,添加量为2%,偶联剂用量为5%时,纳米复合纤维素膜的各项性能达到最佳。  相似文献   

9.
采用表面凝胶化技术制备超疏水性涂膜   总被引:1,自引:0,他引:1  
采用表面凝胶化技术制备了超疏水性涂膜.在醇溶性氟化聚合物溶液中,在水量不足的酸性条件下,掺杂聚四氟乙烯(PTFE),得到了杂化复合溶胶.涂敷后,以表面凝胶化技术为手段,在涂层表面形成了微米和纳米相结合的阶层结构膜.TEM和XPS证实了凝胶化只在膜表面发生,SEM和AFM观察到膜表面的形貌与天然荷叶表面极其相似.该方法制备的涂膜对水的接触角高达155°,并具有良好的力学性能,可用于制备超疏水性功能化膜材料.  相似文献   

10.
基于LFM的类金刚石膜纳米摩擦现象研究   总被引:4,自引:0,他引:4  
陈曦  丁建宁  李长生  范真  朱守星 《真空》2004,41(1):30-35
使用原子力显微镜(AFM)中的侧向力(LFM)模式对类金刚石膜纳米尺度的摩擦现象进行了研究,主要考察了载荷、微观形貌、粘附对类金刚石膜纳米摩擦性能的影响.首先结合粘附的影响提出了适用于外加载荷在100 nN以下类金刚石膜纳米摩擦力表征的修正Amonton公式.其次,试验发现摩擦过程中表面接触峰的斜率对薄膜的微观摩擦力的影响较大,微观摩擦系数与倾角θ成正比例关系,最后结合两者给出了综合考虑载荷、表面形貌、粘附且可用于类金刚石膜纳米尺度摩擦力表征的数学方法.  相似文献   

11.
An atomic force microscopy image is a dilation of the specimen surface with the probe tip. Tips wear or are damaged as they are used. And AFM tip shape and position status make AFM images distorted. So it is necessary to characterize AFM tip shape and position parameters so as to reconstruct AFM images. A geometric model-based approach is presented to estimate AFM tip shape and position status by AFM images of test specimens and scanning electron microscope (SEM) images of AFM tip. In this model, the AFM tip is characterized by using a dynamic cone model. The geometric relationship between AFM tip and the sample structure is revealed in linewidth and profile measurement. The method can easily calculate the tip parameters including half-cone angle, installation angle, scanning tilting angle and curvature radius, and easily estimate the position status of AFM tip when AFM tip moves on the specimen. The results of linewidth and profile measurement are amended accurately through this approach.  相似文献   

12.
Successful deep and alignment-free patterned etching on GaN using atomic force microscope (AFM) local oxidation followed by in-situ chemical etching is demonstrated. Oxide ridges are grown on GaN on an AFM by applying positive sample bias at 80% humidity, with the oxidation reaction expedited by UV light. The oxide ridges are then etched by HCl solution, leaving troughs in the GaN surface. A dripping strategy for the in-situ chemical etching is recommended that allows deep, alignment-free multiple AFM oxidation/etching works on the GaN surface without any need of substrate removal from the AFM platform. Repeated etching followed by AFM oxidation on a spot on a GaN surface resulting in a hole as deep as 800 nm was also demonstrated. Further, a preliminary evaluation of the porosity of the AFM-grown oxide indicates that the oxide ridges grown on GaN at an AFM cantilever moving speed of 300 nm/s are porous in structure, with an estimated porosity of 86%, which porosity could be reduced if longer resident time of the AFM cantilever on the target oxidation region was used.  相似文献   

13.
We propose a new method of fractal analysis of the phase images obtained by the atomic-force microscopy (AFM) to study the properties of molecular adsorption films of corrosion inhibitors on the coarse polycrystalline surface, which can hardly be distinguished by using AFM height images due to the roughness of the surface. The system of polycrystalline aluminum and SDS (Sodium Dodecyl Sulfate) inhibitor is chosen as the research object. The electrochemical measurements of aluminum electrodes precoated with SDS films are carried out in HCl solutions, and the results show that the inhibition efficiency increases with the concentration of SDS in the prefilming solution and then remains nearly constant as the CMC (critical micelle concentration) of SDS is exceeded. The fractal analysis of the AFM images of prefilmed aluminum surfaces obtained in SDS solutions is performed and demonstrates that, as the SDS concentration increases, no obvious changes are observed for the fractal dimensions of height images, whereas the phase images present regular changes in the values of fractal dimensions, thus displaying the consistent alteration rule as revealed by electrochemical tests. The results prove the feasibility of the fractal analysis of AFM phase images in characterizing the adsorption behavior of the corrosion inhibitor on polycrystalline coarse surfaces.  相似文献   

14.
The local, nanoscale deformation behavior of ultrathin polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) films used as substrates in magnetic tapes was studied by atomic force microscopy (AFM) and digital image correlation (DIC) techniques. A custom-designed tensile stage was integrated with the AFM to perform uniaxial tension tests on the polymeric films in situ where the film surfaces were imaged simultaneously by AFM. The surface features on the PET and PEN films were used as reference patterns for the DIC processing. To improve the accuracy of the AFM imaging system for the application of the DIC method, a simple, cost-effective experimental procedure was established. Axial and transverse strain fields and Poisson's ratio maps with a spatial resolution of 78.13 nm were constructed via processing the AFM images of unstretched and stretched samples with the DIC software. Results from the AFM studies indicate that the deformation in both PET and PEN is nonuniform at the nanoscale. The nanoscale deformation mechanisms are discussed in conjunction with the structure of the PET and PEN films  相似文献   

15.
硅表面十六烯薄膜的制备与表征   总被引:2,自引:0,他引:2  
利用机械与化学结合的方法实现了硅基底上的可控自组装(“割草种花”思想),为纳米尺度结构的构筑提供了一定的实验基础.基于金刚石刀具切削的自组装加工技术,在氢终止的硅表面上制备了十六烯自纽装单分子膜,并利用原子力显微镜(AFM)和X射线光电子能谱(XPS)对自组装膜进行了检测和表征,证明这种方法能够方便快捷地实现硅基底上的可控自组装;并用AFM检测了十六烯薄膜的黏着力,分析了可能导致其变化的原因,根据黏着力的变化也说明切削区域生成了自组装膜。  相似文献   

16.
聚芳硫醚酮酰胺分离膜的制备和表征   总被引:1,自引:0,他引:1  
以聚芳硫醚酮酰胺(PASKA)为膜材料,N-甲基吡咯烷酮(NMP)为溶剂通过相转化法制备分离膜。分别用原子力显微镜(AFM)和扫描电镜(SEM)研究薄膜的微观结构,分析了铸膜液质量分数对膜表面和断面结构的影响以及对表面粗糙度的贡献情况,并进一步探讨了不同保存方法对膜的结构和性能产生的差异。  相似文献   

17.
Tyrosinase activity is monitored by pi-donor-acceptor force interactions between a bipyridinium-modified AFM tip and the biocatalytic reaction product generated on a tyramine- (or dopamine-) modified surface. Upon oxidation of the surface to dopaquinone as a result of tyrosinase activity, force interactions are switched "OFF". After reduction of the resulting surface with ascorbic acid, forces are quantitatively reestablished as a result of the formation of the dopamine-functionalized surfaces. The method provides a general approach to design biosensors using force interactions as the readout signal.  相似文献   

18.
通过旋涂硝酸铁异丙醇溶液于P型硅表面以获得均匀分布的催化剂颗粒,以CH4为反应气体采用CVD方法即可在P型硅表面均匀生长单壁碳纳米管,并且部分碳纳米管呈直立状.研究了催化剂浓度、生长基底、反应温度对单壁碳纳米管表面生长情况的影响.研究表明,催化剂浓度升高或采用二氧化硅替代P型硅为生长基底时,都会导致单壁碳纳米管生长的密度加大,而碳纳米管长度变短且更易贴附基底表面生长;随反应温度的提高碳纳米管的生长效率降低,并使得碳纳米管更易贴附基底表面生长.采用此方法制备的生长有直立碳纳米管的硅片作为扫描基底,在原子力显微镜敲击模式下利用拾取法成功制备了碳纳米管原子力显微镜针尖.  相似文献   

19.
采用磁控溅射法制备了不同组分和厚度的Cu/Ti薄膜,采用原子力显微镜(AFM)测量了其表面形貌,利用功率谱法对AFM高度图像进行了分形表征。结果表明:Cu/Ti薄膜表面形貌具有多尺度行为,表面演化在全域和局域呈现出不同的标度行为;AFM图像功率谱的高频段直接体现了薄膜表面的细节信息,而低频段体现了薄膜表面背景区域的复杂程度;低频分形维数与粗糙度之间有着必然的联系,能够反应粗糙值Ra的变化趋势。  相似文献   

20.
Several common single layer films (PE‐HD, PE‐LD, PP‐BO, PA6‐BO and PET‐BO) and multilayer (PS/PE, PP‐BO/PEpeel and PET‐BO/PE) films were treated by either high pressure (600 MPa) or temperature (80 °C/90 °C) to simulate a high pressure or thermal pasteurization process. The samples were tested by atomic force microscopy (AFM), profile method and surface energy measurements to obtain information about the influence of the treatments on the surface topography and surface energy of the samples and by differential scanning calorimetry and by tensile testing concerning material properties. As key figures arithmetic surface roughness (by AFM at Pulsed Force Mode and profile method), surface energy by surface energy measurement and adhesion between tip and surface by AFM were extracted. Results indicate an influence of both high‐pressure processing and thermal‐processing on the surface roughness of biaxial oriented polymer films as single layer films. Laminated biaxially oriented polymer films showed no changes regardless of which processing was performed. The surface energy was hardly affected by both of the treatments for any stretched, non‐stretched, single or laminated films.  相似文献   

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