Imaging of sub-surface nano particles by tapping-mode atomic force microscopy

Feng, Jiyun; Weng, Lu‐Tao; Chan, Chi Ming; Xhie, J.; Li, Lin

doi:10.1016/s0032-3861(00)00464-x

Cited by 29 publications

(14 citation statements)

References 23 publications

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“…Recently, AFM has been considered as a powerful surface charaterization technique and has been widely used to study surface morphology of homopolymer, blockcopolymer, and polymer blends. Nanophase separation and nanostructural changes in polymer films have been being investigated through measuring surface morphology using AFM because formation of nanoaggregates in polymer films can be monitored by changes in surface roughness at the nanoscale 34–38. Figure 4 shows AFM images of three kinds of poly(urethane‐ co ‐acrylic acid) gels.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of nanophase‐separated poly(urethane‐co‐acrylic acid) network films and their application for magnetic nanoparticle synthesis

Kim¹,

Shin²,

Ryu³

et al. 2004

J of Applied Polymer Sci

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Poly(urethane-co-acrylic acid) films were synthesized by the copolymerization of urethane acrylate nonionomer (UAN) and acrylic acid (AA) under different conditions. Poly(urethane-co-acrylic acid) films exhibited very different mechanical properties, attributed to the microstructural difference with the type of solvents used in the film preparation. The film synthesized using UAN/AA/ water mixture had a relatively highly nanophase separated structure compared to that of the other films prepared using UAN/AA/dioxane mixture, resulting in higher mechanical property and glass-transition temperature. The nanostructural differences could be also confirmed by atomic force microscopy measurements. Magnetic nanocomposite films synthesized based on UAN/AA/water and UAN/AA/dioxane mixtures showed different sizes of magnetic nanoparticles, attributed to the differences of size of hydrophilic nanodomains. The higher the degree of nanophase separation within poly(urethane-co-acrylic acid) films, the larger the size of hydrophilic nanodomains, resulting in formation of larger nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Synthesis of nanophase‐separated poly(urethane‐co‐acrylic acid) network films and their application for magnetic nanoparticle synthesis

Kim¹,

Shin²,

Ryu³

et al. 2004

J of Applied Polymer Sci

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“…To confirm this assumption, hydrofluoric acid (HF) etching was carried out to remove the Si0 2 domains on the C-Si0 2 membrane surface, and then electron spectroscopy was used for chemical anylysis (ESCA) to examine the surface composition before and after the acid treatment (Figure lb). The Si 2p spectrum can be fitted with two components in Si compounds: Si(I) at 101.5 eV and Si(II) at about 103.0 eV; Si(I) and Si(II) are attributed to PDMS and Si0 2 , respectively (17). A Si(I) spectrum was not observed after pyrolysis, indicating conversion of PDMS to a Si0 2 phase.…”

Section: Structural Analysis Of C-sio Z Membranesmentioning

confidence: 95%

Novel Carbon-Silica Membranes for Improved Gas Separation

Lee

Park

2004

ACS Symposium Series

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Novel carbon-silica (C-SiO 2 ) membranes were prepared by pyrolyzing microphase-separated block or random copolymers consisting of two different domains -carbon-rich or siliconrich domains. The size and shape of the ultra-micropores were dominated by the initial morphology of the C-SiO 2 precursorpoly(imide siloxane) (PIS). The morphological changes in polymeric nanomaterials, such as block or random copolymers consisting of two phases, affected the gas permeation properties to a large extent. In a molecular probe study using small molecules (He, CO 2 , O 2 , and N 2 ) having sizes from 2.60 to 3.64 Å, the C-SiO 2 membranes exhibited outstanding molecular sieving capability, together with a high gas permeability. The present study demonstrates that the main geometry of the C-SiO 2 precursor determines the microstructure and the gas separation capability of the final pyrolytic C-SiO 2 membrane. 190

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“…两亲性嵌段共聚物 PCL鄄b鄄PDMS鄄b鄄PCL 复合环氧树脂中,PDMS 是疏水性的, 亲水链段 PCL 与同样具有亲水性的环氧树脂在固化的过程中通过分子间贯穿融合在一起, 形成基体 [24] . 共聚物所含质量分数(0-40%)不同时, 其浇铸薄膜表面的接触角可以得到内层结构的形貌和相图 [5,6] . 结果显示, R sp = 0.…”

Section: 实验部分unclassified

Surface Structure of Epoxy Resin Blended with PCL-<em>b</em>-PDMS-<em>b</em>-PCL

李慧琴¹,

金承钰²,

范文春³

et al. 2009

Acta Physico-Chimica Sinica

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： Thesurfaceenrichmentandphaseseparationstructuresofepoxyresinandpoly(着鄄caprolactone)鄄block鄄 polydimethylsiloxane鄄block鄄poly(着鄄caprolactone)triblockcopolymer(PCL鄄b鄄PDMS鄄b鄄PCL)blendswerestudiedusing tappingmodeatomicforcemicroscopy(TM鄄AFM)andfrictionalforcemicroscopy(FFM).Frictionandwearproperties showthatthesurfaceisenrichedwiththePDMScomponentanditreachesastablestateataPCL鄄b鄄PDMS鄄b鄄PCL massfractionofabout30%.Contactanglemeasurementsonthesurfacealsosupporttheseresults.

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Imaging of sub-surface nano particles by tapping-mode atomic force microscopy

Cited by 29 publications

References 23 publications

Synthesis of nanophase‐separated poly(urethane‐co‐acrylic acid) network films and their application for magnetic nanoparticle synthesis

Synthesis of nanophase‐separated poly(urethane‐co‐acrylic acid) network films and their application for magnetic nanoparticle synthesis

Novel Carbon-Silica Membranes for Improved Gas Separation

Surface Structure of Epoxy Resin Blended with PCL-<em>b</em>-PDMS-<em>b</em>-PCL

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