NMR investigations of silane-coated nano-sized ZnO particles

Kotecha, Mrignayani; Veeman, W. S.; Rohe, Bernd; Tausch, Michael W.

doi:10.1016/j.micromeso.2006.04.017

Cited by 34 publications

(30 citation statements)

References 11 publications

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“…The nature of the silane anchored to the ZnO surface is probed using 29 Si solid‐state CP/MAS NMR 23. The identification of the silane‐ZnO bonding mode follows the classification by Veeman et al ,24, 25 which is illustrated in Figure 1b. The silane bonding type T 0 can be unequivocally assigned to both samples based on the peaks at ‐34.1 ppm and ‐33.5 ppm for Batch 1 and Batch 2, respectively (Figure 1c).…”

Section: Polymer‐grafted Nanoparticlesmentioning

confidence: 95%

Synthesis and Fabrication of Multifunctional Nanocomposites: Stable Dispersions of Nanoparticles Tethered with Short, Dense and Polydisperse Polymer Brushes in Poly(methyl methacrylate)

Wong

Guenther

Sun

et al. 2012

Adv Funct Materials

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This paper presents a melt‐processable multifunctional nanocomposite material that shows highly controlled tunability in refractive index, glass transition temperature (Tg) and energy bandgap. ZnO quantum dots tethered with polymer brushes are melt‐blended into the matrix polymer, giving rise to multiple functionalities in the nanocomposites. Brush–matrix polymer interactions are important in determining the ability of polymer‐grafted nanoparticles to disperse in a polymer melt, of which graft density (σ), brush (N) and matrix (P) polymer lengths are the critical parameters. It is generally assumed that long polymer brushes (N > P) and an optimum graft density are necessary to achieve a good dispersion. Here it is demonstrated that nanoparticles tethered with short, dense and polydisperse polymer brushes via radical copolymerization can exhibit a stable, fine dispersion in the polymer melt. The quality of the dispersion of the nanoparticles is characterized by measuring physical properties that are sensitive to the state of the dispersion. This synthesis method presents a general approach for the inexpensive and high‐throughput fabrication of high quality, melt‐blendable nanocomposites that incorporate functional nanoparticles, paving the way for wider application of high performance nanocomposites.

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Section: Polymer‐grafted Nanoparticlesmentioning

confidence: 95%

Synthesis and Fabrication of Multifunctional Nanocomposites: Stable Dispersions of Nanoparticles Tethered with Short, Dense and Polydisperse Polymer Brushes in Poly(methyl methacrylate)

Wong

Guenther

Sun

et al. 2012

Adv Funct Materials

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“…We conclude that the nature of the metal cation does not play a significant role for the micromorphology of the precatalyst, and we also conclude that most of the surface must be ascribed to internal pores, given the fact that the samples appear agglomerated and not nanoparticulate in SEM. The amorphous silicon dioxide which is left after photooxidation [30,32] is probably responsible for this effect, preventing the fusion of the oxide nanoparticles by formation of a porous coating layer. Note that the UV-photooxidation is not complete, as indicated by the residual content of carbon and hydrogen (Table 1) and also by weak characteristic C-H vibrations in IR spectroscopy (data not shown).…”

Section: Resultsmentioning

confidence: 99%

“…[30,32] . 11.12 g (45 mmol) (3-methacryloxypropyl)trimethoxysilane was added to 333 g methanol at 55°C in a 1-L round-bottomed flask.…”

Section: Methodsmentioning

confidence: 99%

“…[30] By precipitating the oxides in the presence of a silane in alcohol, a highly dispersed mixture of the oxides with a high specific surface area [31] is obtained because the silane prevents the growth and agglomeration of the oxide crystals. [32] Subsequently, the organic substituents of the silane are photochemically oxidized and almost completely removed. [30] The ratio of copper to zinc can be easily varied by this method, opening a way to nanocrystalline systems of CuO/ZnO in amorphous silica with a high overall specific surface area.…”

Section: Introductionmentioning

confidence: 99%

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CuO/ZnO Nanoparticles in a Matrix of Amorphous Silica as High‐Surface Precursors for Methanol Synthesis

et al. 2007

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An intimate mixture of CuO/ZnO nanocrystals was prepared by an easy sol-gel synthesis (precipitation in methanol by hydroxide in the presence of a silane). The organic substituents of the silane were almost completely removed by a subsequent photochemical oxidation. The resulting amorphous SiO 2 prevented the growth of the catalytically active particles to larger crystals. The coating layer of silica can easily be penetrated by gaseous reactants, as shown by the high spe-

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“…11 for many applications, like as pigment in paints, as UV filter in products for sun protection and as sun lotions for skin cancer protection. [14][15][16] Based on the basic theory of gas condensation method, this research uses a pure Zn block as the original material. A high frequency method is adopted to vaporize the Zn material.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nanosized ZnO by High Frequency Induction Method

Chang¹,

Tsai²

2008

j nanosci nanotechnol

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In this study, presents an innovative method for nanoparticle synthesis system for nanosized ZnO fabrication with powder or suspension type. The experimental device is primarily composed of a high frequency induction heating system, a pressure control system, a temperature control system and an automatic nanoparticle collection system. This study employs an automatic collection system with liquid nitrogen to condense and collect the nanoparticles. The influence of such process variables such as heating temperature and vacuum pressure are analyzed and compared through experimentation in order to identify the working conditions most conducive to the production of nanoparticles with smaller mean particle size. The prepared ZnO nanoparticles are characterized for nanostructural properties by the TEM and XRD. An Ultraviolet-Visible (UV-Vis) spectrophotometer is used to analyze the optical property of the nanoparticles. The ZnO nanofluid already has good dispersion, so even without dispersant, it can still remain in stable suspension for a fairly long time. Experimental results indicate that the particle size of produced ZnO nanoparticles is around 20 nm and with the production rate of 1.24 g/min.

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NMR investigations of silane-coated nano-sized ZnO particles

Cited by 34 publications

References 11 publications

Synthesis and Fabrication of Multifunctional Nanocomposites: Stable Dispersions of Nanoparticles Tethered with Short, Dense and Polydisperse Polymer Brushes in Poly(methyl methacrylate)

Synthesis and Fabrication of Multifunctional Nanocomposites: Stable Dispersions of Nanoparticles Tethered with Short, Dense and Polydisperse Polymer Brushes in Poly(methyl methacrylate)

CuO/ZnO Nanoparticles in a Matrix of Amorphous Silica as High‐Surface Precursors for Methanol Synthesis

Synthesis of Nanosized ZnO by High Frequency Induction Method

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