Factors Affecting the Height and Phase Images in Tapping Mode Atomic Force Microscopy. Study of Phase-Separated Polymer Blends of Poly(ethene-<i>co</i>-styrene) and Poly(2,6-dimethyl-1,4-phenylene oxide)

Bar, G.; Thomann, Yi; Brandsch, and R.; Cantow, H.‐J.; Whangbo, Myung‐Hwan

doi:10.1021/la970091m

Cited by 344 publications

(351 citation statements)

References 30 publications

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“…Por meio do monitoramento da diferença de fase entre a oscilação da haste e o sinal padrão, que movimenta a cerâmica piezoelétrica durante a varredura, é possível detectar variações na composição, adesão, atrito e viscoelasticidade, entre outras propriedades. Como a imagem de fase não é afetada por grandes diferenças de altura, ela proporciona uma observação clara das características finas da amostra que podem ser ocultadas pela topografia rugosa da superfície [17][18][19] .…”

Section: Resultsunclassified

Redução da hidrofilicidade de filmes biodegradáveis à base de amido por meio de polimerização por plasma

et al. 2004

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Resumo: Devido ao baixo custo de produção e excelente biodegradabilidade, o amido constitui-se em matéria-prima promissora para a produção de plásticos biodegradáveis. No entanto, a grande hidrofilicidade dos filmes à base de amido representa uma séria limitação tecnológica à sua comercialização, uma vez que as propriedades dos filmes são afetadas pela variação da umidade relativa do ar durante a sua estocagem ou o seu uso. Neste trabalho, filmes de amido termoplástico foram recobertos com uma fina camada protetora polimérica gerada por intermédio da tecnologia de plasma frio. 1-Buteno e 1,3-butadieno foram utilizados como monômeros para a polimerização por plasma. Os filmes recobertos apresentaram uma redução de até 80% na absorção de água e aumento do ângulo de contato em relação à água. Estes resultados indicaram uma redução significativa na natureza hidrofílica do material à base de amido após o recobrimento. Palavras-chave: Amido termoplástico, deposição por plasma, microscopia de força atômica, hidrofilicidade. Reduction of Hydrophilicity of Biodegradable Starch-Based Films by Plasma PolymerizationAbstract: Due to low cost and excellent biodegradability, the use of starch as a raw material for bioplastic production is growing in interest. However, the properties of starch-based materials are affected by relative humidity during their use and storage due to their hydrophilic character. In this work, thermoplastic cornstarch films were coated by cold plasma technology with a protective thin layer in order to reduce water sensitivity. 1-Butene and 1,3-butadiene were used as monomers for plasma polymerization. Coated films presented a reduction of water absorption up to 80% an increase in contact angle related to water. These results indicated that the coating process reduced significantly the hydrophilic nature of the starch-based materials.

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Section: Resultsunclassified

Redução da hidrofilicidade de filmes biodegradáveis à base de amido por meio de polimerização por plasma

et al. 2004

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“…Generally, regions of increased hardness or modulus appear as bright spots in the phase image. However, it has been shown that phase images can be sensitive to the operating parameters including r sp and the free amplitude of oscillation, particularly in a heterogeneous system having different compliances (Bar, et al, 1997). Phase images can even undergo contrast reversals as imaging parameters are changed, making it difficult to assign features in height and phase images to different components based on the direction of phase shift alone (Pickering and Vancso, 1998).…”

Section: Nanogold Labeling Of Fibrinogenmentioning

confidence: 99%

Immunological identification of fibrinogen in dual-component protein films by AFM imaging

Soman

Rice

Siedlecki

2008

Micron

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The success of long-term blood-contacting implanted devices is largely dependent upon the interaction of the blood components with the device biomaterial surface. The ability to study these interactions has been hindered by a lack of methods to measure single-molecule interactions in complex multi-protein environments similar to the environment found in-vivo. In this paper, we demonstrate the use of atomic force microscopy (AFM) in conjunction with gold nanolabels to detect the protein fibrinogen under aqueous conditions without the topographical clues usually necessary for high resolution visualization. BSA was patterned onto both muscovite mica and plasma-treated polydimethylsiloxane (PDMS) substrates and these test substrates were subsequently backfilled with fibrinogen to yield a featureless protein layer. The fibrinogen in this dual protein layer was detected using high resolution AFM imaging following infusion of anti-fibrinogen conjugated with nanogold particles. This AFM immuno-detection technique will potentially be applicable to complex multicomponent protein films adsorbed on clinically-relevant polymers used in medical devices.

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“…Atomic force microscopy (AFM) is a scanning probe technique capable of very high spatial resolution and, when operated in tapping mode, can provide additional information such as differences in local material properties that can then be used to assess phase separation (4). The technique has been used widely in the polymer field (5) over the past two decades for evaluating systems such as polymer blends (6,7), block copolymers (8,9), and nanocomposites (10,11). Beyond the polymer and plastic industries, the technique has been gaining popularity within the pharmaceutical field for the characterization of amorphous solid dispersions (12)(13)(14)(15)(16).…”

Section: Introductionmentioning

confidence: 99%

Assessing Mixing Quality of a Copovidone-TPGS Hot Melt Extrusion Process with Atomic Force Microscopy and Differential Scanning Calorimetry

et al. 2015

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Abstract. Atomic force microscopy (AFM) and modulated differential scanning calorimetry (mDSC) were used to evaluate the extent of mixing of a hot melt extrusion process for producing solid dispersions of copovidone and D-α-tocopherol polyethylene glycol 1000 succinate (TPGS 1000). In addition to composition, extrusion process parameters of screw speed and thermal quench rate were varied. The data indicated that for 10% TPGS and 300 rpm screw speed, the mixing was insufficient to yield a singlephase amorphous material. AFM images of the extrudate cross section for air-cooled material indicate round domains 200 to 700 nm in diameter without any observed alignment resulting from the extrusion whereas domains in extrudate subjected to chilled rolls were elliptical in shape with uniform orientation. Thermal analysis indicated that the domains were predominantly semi-crystalline TPGS. For 10% TPGS and 600 rpm screw speed, AFM and mDSC data were consistent with that of a single-phase amorphous material for both thermal quench rates examined. When the TPGS concentration was reduced to 5%, a single-phase amorphous material was achieved for all conditions even the slowest screw speed studied (150 rpm).

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Factors Affecting the Height and Phase Images in Tapping Mode Atomic Force Microscopy. Study of Phase-Separated Polymer Blends of Poly(ethene-co-styrene) and Poly(2,6-dimethyl-1,4-phenylene oxide)

Cited by 344 publications

References 30 publications

Redução da hidrofilicidade de filmes biodegradáveis à base de amido por meio de polimerização por plasma

Redução da hidrofilicidade de filmes biodegradáveis à base de amido por meio de polimerização por plasma

Immunological identification of fibrinogen in dual-component protein films by AFM imaging

Assessing Mixing Quality of a Copovidone-TPGS Hot Melt Extrusion Process with Atomic Force Microscopy and Differential Scanning Calorimetry

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