Correlated Roughness in Polymer Films Containing Maghemite Nanoparticles

Kashem, Mottakin M. Abul; Perlich, Jan; Schulz, Leander; Roth, Stephan V.; Müller‐Buschbaum, Peter

doi:10.1021/ma702156q

Cited by 29 publications

(24 citation statements)

References 41 publications

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“…The improvements can include mechanical properties, heat resistance, flammability, gas permeability, and biodegradability of biodegradable polymers. 35,36 The use of inorganic nanoparticles with higher affinity/solubility for the polymer matrix can reduce phase separation processes which occur during polymer dewetting, thus avoiding the film structuring. linear and non-linear optical properties or biological activity.…”

Section: Introductionmentioning

confidence: 99%

Integrated PLGA–Ag nanocomposite systems to control the degradation rate and antibacterial properties

Rinaldi

Fortunati

Taddei

et al. 2013

J of Applied Polymer Sci

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Biodegradable polymer based nanocomposite materials have attracted much attention since they can be used for biomedical and pharmaceutical applications. In order to have highly integrated PLGA nanocomposite materials, silver colloidal nanoparticles were prepared in chloroform starting from silver nitrate and using polyvinylpyrrolidone as reduction and capping agent. TEM and AFM imaging give information on the size distribution of the silver nucleus (7.0 nm) and the capping shell (8.2-10.7 nm). PLGA-Ag nanocomposites were prepared upon addition of 1 or 3% wt of silver nanoparticles to the PLGA/chloroform suspension. The effect of silver loading on polymer degradation was studied following the mass loss and the morphology of nanocomposite films at different degradation stages. The concentrations of Ag 1 , which is released during nanocomposite degradation, were monitored and analyzed through the diffusion model, to have insight on the degradation kinetics. The release rate, and likely the degradation rate, was reduced at higher silver loading. Bacterial growth tests indicated that the cell growth is inhibited in the presence of PLGA-Ag nanocomposites and the efficiency is correlated to Ag 1 release. Thus, controlling the nanoparticle loading, a tunable degradation and antibacterial action can be designed.

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Section: Introductionmentioning

confidence: 99%

Integrated PLGA–Ag nanocomposite systems to control the degradation rate and antibacterial properties

Rinaldi

Fortunati

Taddei

et al. 2013

J of Applied Polymer Sci

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“…Furthermore, the ripplestructure or intensity modulation at the Yoneda region indicates interference effects originating from correlated roughness of thin film and substrate. [52][53][54] For the further quantitative analysis, line cuts in the vertical and horizontal direction from the GISAXS pattern are displayed in Fig. 8.…”

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confidence: 99%

“…Because the obtained length exceeds the P3OT film thickness ͑120 nm͒ considerably, the observed modulation effect is caused by the roughness correlated thin film in a dynamical waveguide manner. 54 The corresponding horizontal cut shown in Fig. 8͑b͒ was performed at the critical angle ␣ c, P3OT and contains information about lateral structures of the P3OT thin film.…”

mentioning

confidence: 99%

Grazing incidence wide angle x-ray scattering at the wiggler beamline BW4 of HASYLAB

Perlich¹,

Rubeck²,

Botta³

et al. 2010

Review of Scientific Instruments

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We present an upgrade of the available measurement techniques at the wiggler beamline BW4 of the Hamburger Synchrotronstrahlungslabor ͑HASYLAB͒ to grazing incidence wide angle x-ray scattering ͑GIWAXS͒. GIWAXS refers to an x-ray diffraction method, which, based on the measurement geometry, is perfectly suited for the investigation of the material crystallinity of surfaces and thin films. It is shown that the overall experimental GIWAXS setup employing a movable CCD-detector provides the capability of reliable and reproducible diffraction measurements in grazing incidence geometry. Furthermore, the potential usage of an additional detector enables the simultaneous or successive measurement of GIWAXS and grazing incidence small angle x-ray scattering ͑GISAXS͒. The new capability is illustrated by the microbeam GIWAXS measurement of a thin film of the conjugated polymer poly͑3-octylthiophene͒ ͑P3OT͒. The investigation reveals the semicrystalline nature of the P3OT film by a clear identification of the wide angle scattering reflexes up to the third order in the ͓100͔-direction as well as the first order in the ͓010͔-direction. The corresponding microbeam GISAXS measurement on the present morphology complements the characterization yielding the complete sample information from subnanometer up to micrometer length scales.

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“…For very rough or very smooth surfaces, the measured elemental abundances would be systematically too low having a rock grinding tool on board a planetary rover, a medium roughness range would be sufficient for a lunar mission. The physics behind the decrease of X-ray fluxes for very rough or very smooth surfaces is known to be the effects of X-ray diffusion and reflectance off of the smoother surface and as well as grazing-incident small-angle scattering, of the rougher surfaces [18][19][20][21] . X-rays exhibit total external reflection when incident on a sample at an angle below a critical incidence angle.…”

Section: Findings From the Preliminary Study On Surface Roughnessmentioning

confidence: 99%

An Active X-Ray Spectrometer for the SELENE-2 Rover

Kim

Amano

Boynton

et al. 2014

AEROSPACE TECHNOLOGY JAPAN

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The Active X-ray Spectrometer (AXS) for the Japanese SELENE-2 rover has been proposed for elemental analysis on the lunar surface to measure the major elements: Mg, Al, Si, Ca, Ti, and Fe; the minor elements, Na, K, P, S, Cl, Cr, and Mn and the trace element Ni, all depending on their concentrations at a landing site. The elemental data of the AXS allow us to not only classification but also quantification of surface rocks on the Moon. The AXS is a compact low-weight instrument for elemental analysis based on the principle of X-ray fluorescence spectrometry using an X-ray spectrometer and two (four) pyroelectric crystals as X-Ray Generators (XRG). This paper introduces the current status of the pre-project to develop an AXS for the SELENE-2 Rover including the investigations on the generation of X-ray flux of the XRG, required surface roughness for the XRS measurement, and a thermal design of the AXS.

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Correlated Roughness in Polymer Films Containing Maghemite Nanoparticles

Cited by 29 publications

References 41 publications

Integrated PLGA–Ag nanocomposite systems to control the degradation rate and antibacterial properties

Integrated PLGA–Ag nanocomposite systems to control the degradation rate and antibacterial properties

Grazing incidence wide angle x-ray scattering at the wiggler beamline BW4 of HASYLAB

An Active X-Ray Spectrometer for the SELENE-2 Rover

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