Synthesis and characterization of new barium titanate core–gold shell nanoparticles

FarrokhTakin, Elmira; Ciofani, Gianni; Gemmi, Mauro; Piazza, Vincenzo; Mazzolai, Barbara; Mattoli, Virgilio

doi:10.1016/j.colsurfa.2012.09.021

Cited by 11 publications

(8 citation statements)

References 46 publications

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“…Previous investigations have reported good cytotoxicity results for BT alone. 30,59,60 The surface modified BT with CDs, which helps to stabilize the nanoparticles in solution, display excellent viability of the cells, even up to concentrations of 200 μg/mL. 39 Figure 10 shows the MTT results for the T1107 hydrogels at different concentrations with and without BT200-βCD nanoparticles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Structure and Rheology of Poloxamine T1107 and Its Nanocomposite Hydrogels with Cyclodextrin-Modified Barium Titanate Nanoparticles

et al. 2016

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We report the preparation of a nanocomposite hydrogel based on a poloxamine gel matrix (Tetronic T1107) and cyclodextrin (CD)-modified barium titanate (BT) nanoparticles. The micellization and sol-gel behavior of pH-responsive block copolymer T1107 were fully characterized by small-angle neutron scattering (SANS), dynamic light scattering (DLS), and Fourier transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy as a function of concentration, pH and temperature. SANS results reveal that spherical micelles in the low concentration regime present a dehydrated core and highly hydrated shell, with a small aggregation number and size, highly dependent on the degree of protonation of the central amine spacer. At high concentration, T1107 undergoes a sol-gel transition, which is inhibited at acidic pH. Nanocomposites were prepared by incorporating CD-modified BT of two different sizes (50 and 200 nm) in concentrated polymer solutions. Rheological measurements show a broadening of the gel region, as well as an improvement of the mechanical properties, as assessed by the shear elastic modulus, G' (up to 200% increase). Initial cytocompatibility studies of the nanocomposites show that the materials are nontoxic with viabilities over 70% for NIH3T3 fibroblast cell lines. Overall, the combination of Tetronics and modified BaTiO3 provides easily customizable systems with promising applications as soft piezoelectric materials.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Structure and Rheology of Poloxamine T1107 and Its Nanocomposite Hydrogels with Cyclodextrin-Modified Barium Titanate Nanoparticles

et al. 2016

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“…A scanning-electron-microscope image of some NPs deposited on a microscope glass slide is shown in Fig 1b . The full synthesis and characterization details of the NPs are reported elsewhere [ 9 , 27 ].…”

Section: Methodsmentioning

confidence: 99%

Femtosecond-Laser-Pulse Characterization and Optimization for CARS Microscopy

et al. 2016

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We present a simple method and its experimental implementation to determine the pulse durations and linear chirps of the pump-and-probe pulse and the Stokes pulse in a coherent anti-Stokes Raman scattering microscope at sample level without additional autocorrelators. Our approach exploits the delay line, ubiquitous in such microscopes, to perform a convolution of the pump-and-probe and Stokes pulses as a function of their relative delay and it is based on the detection of the photons emitted from an appropriate non-linear sample. The analysis of the non-resonant four-wave-mixing and sum-frequency-generation signals allows for the direct retrieval of the pulse duration on the sample and the linear chirp of each pulse. This knowledge is crucial in maximizing the spectral-resolution and contrast in CARS imaging.

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“…These aggregates can reach sizes of a few micrometres Gao et al 2015) and are a main drawback because of their high tendency to precipitate. The modification of the surface of the nanoparticles is a possible approach to improve the stability of the dispersions, either by adsorption on the surface of different substances like polyethylene glycol, PEG (Čulić-Viskota et al 2012), polyacrylic acid ammonium salts, PAA-ammonium (Jean et al 2005) and polyalcohols or by covalent bonding by first generating either amine (FarrokhTakin et al 2012), phosphonic (Kim et al 2007) or hydroxyl (Chang et al; groups on the surface for further grafting of molecules of interest.…”

Section: Introductionmentioning

confidence: 99%

Cyclodextrin-grafted barium titanate nanoparticles for improved dispersion and stabilization in water-based systems

et al. 2016

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Synthesis and characterization of new barium titanate core–gold shell nanoparticles

Cited by 11 publications

References 46 publications

Structure and Rheology of Poloxamine T1107 and Its Nanocomposite Hydrogels with Cyclodextrin-Modified Barium Titanate Nanoparticles

Structure and Rheology of Poloxamine T1107 and Its Nanocomposite Hydrogels with Cyclodextrin-Modified Barium Titanate Nanoparticles

Femtosecond-Laser-Pulse Characterization and Optimization for CARS Microscopy

Cyclodextrin-grafted barium titanate nanoparticles for improved dispersion and stabilization in water-based systems

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