Reduced sedimentation of barium titanate nanoparticles in poly(vinylidene fluoride) films during solution casting by surface modification

Zhao, Rongyan; Zhao, Jun; Wang, Lina; Dang, Zhi‐Min

doi:10.1002/app.42662

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…The sedimentation of nanoparticles or their superstructures and their convective transport during material preparation can establish concentration gradients inside the composite that change material properties (Leeuwenburgh et al 2010;Zhao et al 2015). It is difficult to assess the relevance of gravity in composite preparation because the density of the matrix changes during processing, filler particle densities cannot be easily changed, and growing superstructures increase their sedimentation and friction coefficients.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Light Scattering on Nanoparticles in Microgravity in a Drop Tower

Pyttlik

Kuttich

Kraus

2022

Microgravity Sci. Technol.

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Gravity affects colloidal dispersions via sedimentation and convection. We used dynamic light scattering (DLS) to quantify the mobility of nanoparticles on ground and in microgravity. A DLS instrument was adapted to withstand the accelerations in a drop tower, and a liquid handling set-up was connected in order to stabilize the liquid temperature and enable rapid cooling or heating. Light scattering experiments were performed in the drop tower at ZARM (Bremen, Germany) during a microgravity interval of 9.1 s and compared to measurements on ground. Particle dynamics were analyzed at constant temperature and after a rapid temperature drop using a series of DLS measurements with 1 s integration time. We observed nanoparticles with average gold core diameters of 7.8 nm and non-polar oleylamine shells that were dispersed in tetradecane and had an average hydrodynamic diameter of 21 nm. The particles did not change their diameter in the observed temperature range. The particle dynamics inferred from DLS on ground and in microgravity were in good agreement, demonstrating the possibility to perform reliable DLS measurements in a drop tower.

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Section: Introductionmentioning

confidence: 99%

Dynamic Light Scattering on Nanoparticles in Microgravity in a Drop Tower

Pyttlik

Kuttich

Kraus

2022

Microgravity Sci. Technol.

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“…19 Finally, the interaction between particles and polymer matrix is improved by introducing modier. So far, the modiers commonly used in the surface modication process are hydrogen peroxide (H 2 O 2 ), 20 Phosphonic acids, 21,22 silane coupling agents, 23 etc. Unfortunately, although these modiers lead to an improvement in the compatibility between the matrix and the nanoparticles, they will also bring high leakage current and thus high dielectric loss.…”

Section: Eddmentioning

confidence: 99%

Modulating interfacial charge distribution and compatibility boosts high energy density and discharge efficiency of polymer nanocomposites

et al. 2019

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“…Coating the BT particle surface with an insulating layer (Al 2 O 3 or TiO 2 ) is another promising approach to reduce the current leakage by introducing a potential barrier among the fillers . Although BT‐modified PVDFs possess extraordinary mechanical properties, heat transfer capability, electrical conductivity, and piezoelectric properties, the effect of BT on the crystallization behavior of PVDFs has rarely been studied and reported in a systematic manner.…”

Section: Introductionmentioning

confidence: 99%

Crystallinity and morphology of barium titanate filled poly(vinylidene fluoride) nanocomposites

Gong

Chen

Tang

et al. 2018

J of Applied Polymer Sci

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In this study, crystallization behavior and micromorphology of barium titanate (BaTiO3, or BT) filled poly(vinylidene fluoride) (PVDF) nanocomposites were investigated based on Fourier‐transform infrared spectroscopy (FTIR), polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X‐ray diffractometry (XRD). BT/PVDF nanocomposite films with different concentrations of BT nanoparticles were prepared by solution casting method. The results revealed that the electrical conductivity and Seebeck coefficient of PVDF were improved by the incorporation BT nanoparticles. When 2 wt % of BT was loaded into the PVDF matrix, it mediated the β‐phase crystallization in PVDF. Furthermore, the β‐phase crystals could be transformed into α‐phase after the samples were isothermally crystallized at 155 °C for 20 min. The results of DSC and POM suggest that BT nanoparticles could act as nucleation agents, promoting the crystallization activity of PVDF in a nonisothermal crystallization process. The crystal phase is influential to the electrical properties of PVDF, therefore the findings of this study are useful for the development of new applications based on BT/PVDF nanocomposites, such as high‐performance thermoelectric devices or systems. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46877.

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Reduced sedimentation of barium titanate nanoparticles in poly(vinylidene fluoride) films during solution casting by surface modification

Cited by 8 publications

References 33 publications

Dynamic Light Scattering on Nanoparticles in Microgravity in a Drop Tower

Dynamic Light Scattering on Nanoparticles in Microgravity in a Drop Tower

Modulating interfacial charge distribution and compatibility boosts high energy density and discharge efficiency of polymer nanocomposites

Crystallinity and morphology of barium titanate filled poly(vinylidene fluoride) nanocomposites

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