Synthesis and Characterization of Porous and Nonporous Monodisperse Colloidal TiO2 Particles

Eiden‐Assmann, Stefanie; Widoniak, Johanna; Maret, Georg

doi:10.1021/cm0348949

Cited by 234 publications

(142 citation statements)

References 18 publications

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“…Titanium oxide particles were prepared according to the procedure in Ref. [24]. Melamin particles were acquired from Microparticles GmbH (MF-F-1.3).…”

Section: A Total Internal Reflection Microscopymentioning

confidence: 99%

Force measurement in the presence of Brownian noise: Equilibrium-distribution method versus drift method

et al. 2011

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The study of microsystems and the development of nanotechnologies require alternative techniques to measure piconewton and femtonewton forces at microscopic and nanoscopic scales. Among the challenges is the need to deal with the ineluctable thermal noise, which, in the typical experimental situation of a spatial diffusion gradient, causes a spurious drift. This leads to a correction term when forces are estimated from drift measurements [G. Volpe, L. Helden, T. Brettschneider, J. Wehr, and C. Bechinger, Phys. Rev. Lett. 104, 170602 (2010)]. Here we provide a systematic study of such an effect by comparing the forces acting on various Brownian particles derived from equilibrium-distribution and drift measurements. We discuss the physical origin of the correction term, its dependence on wall distance and particle radius, and its relation to the convention used to solve the respective stochastic integrals. Such a correction term becomes more significant for smaller particles and is predicted to be on the order of several piconewtons for particles the size of a biomolecule.

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“…Titanium oxide particles were prepared according to the procedure in Ref. [24]. Melamin particles were acquired from Microparticles GmbH (MF-F-1.3).…”

Section: A Total Internal Reflection Microscopymentioning

confidence: 99%

Force measurement in the presence of Brownian noise: Equilibrium-distribution method versus drift method

et al. 2011

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“…However, work to develop relatively monodisperse titania has been successful through the addition of salts and polymers (38). Han et al (39) employed a simple approach that involved altering the concentration of calcium chloride in solution.…”

Section: Tio 2 Photocatalystmentioning

confidence: 99%

Chapter Green Nanotechnology: Development of Nanomaterials for Environmental and Energy Applications

Fagan

Cui

Andersen

et al. 2013

ACS Symposium Series

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This book chapter discusses the syntheses of various nanomaterials, for green nanotechnology applications in detail. Special attention is given to the development of emerging areas, such as environmental as well as energy materials. Various approaches for preparing nanostructured photocatalysts, such as titanium dioxide, zinc oxide, iron oxide, and metal sulfides, different conventional methods and novel methods, including

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“…The fractions are 78(6)% and 22(6)%, quite compatible with the estimated surface to volume ratio. This ratio can be estimated as follows: for anatase the unit cell volume is 0.136 nm 3 and in a cube of 6 nm length we have approximately 3,200 Ti-atoms; the surface is 216 nm 2 and using an estimated Ti-OH distance of 0.25 nm we have about 800 near surface Ti-atoms; this gives a ratio of surface to volume atoms of 0.3 or a volume fraction of 80%. The widths of the volume and the surface signals are distinctly wider than that for the nanowires.…”

Section: Defect and Diffusion Forum Vol 311 153mentioning

confidence: 99%

TiO2 Nanomaterials Studied by 44Ti(EC)44Sc Time Differential Perturbed Angular Correlations: Volume and Surface Properties

Butz

Ryu

Jánkuhn

et al. 2011

DDF

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Abstract. TiO 2 nanoparticles (anatase) with diameters between 2 and 4 nm were synthesized by controlled hydrolysis of a solution of titanium (IV)isopropoxide to which 44 Ti in 4M HCl was added. Inactive nanoparticles were analyzed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), the active ones were analyzed by measuring the nuclear quadrupole interaction (NQI) of the I = 1 state in 44 Sc using time differential perturbed angular correlation (TDPAC). Rather broad distributions were obtained. We also synthesized nanowires with typical diameters of 2 nm and 100 nm length using shape controllers. They were analyzed by HRTEM and XRD. The material turned out to be TiO 2 (B). The 44 Ti was added by impregnation and diffusion at 180°C for two hours. Two well-defined NQI signals were observed which we tentatively assigned to the "volume" fraction and the "surface" fraction, i.e. 44 Ti-probes with OH-termination. In addition, we studied AMT-100 (anatase, uncoated, 6 nm), Eusolex T-2000 (rutile, Al 2 O 3 -coated, 20×20×100 nm 3 , simethicone additive) and P25 (mainly anatase, uncoated, 20 nm diameter) using the impregnation and diffusion method. P25 and the isolated rutile fraction from P25 yield spectra which correspond to anatase and rutile volume signals plus their surface signals, respectively. TDPAC thus proved very useful in characterizing the nanomaterials, especially their disorder, by measuring the NQI. In addition, information on surface properties is obtained. The relatively narrow surface signals indicate a lower degree of disorder and are possibly also a result of partial motional averaging of Ti-signals with OH-bonds due to mobile H-atoms.

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Synthesis and Characterization of Porous and Nonporous Monodisperse Colloidal TiO₂ Particles

Cited by 234 publications

References 18 publications

Force measurement in the presence of Brownian noise: Equilibrium-distribution method versus drift method

Force measurement in the presence of Brownian noise: Equilibrium-distribution method versus drift method

Chapter Green Nanotechnology: Development of Nanomaterials for Environmental and Energy Applications

TiO<sub>2</sub> Nanomaterials Studied by <sup>44</sup>Ti(EC)<sup>44</sup>Sc Time Differential Perturbed Angular Correlations: Volume and Surface Properties

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