Comparative study on different coupling agents used as surfactants: effect on dispersion properties of TiN nanoparticles

Abstract

Γ-methacryloxypropyl trimethoxy silane (KH-570) and macromolecular coupling agents (MCA) (St/AN/KH-570 random copolymer) were used as surfactants for the surface modification of titanium nitride (TiN) nanoparticles (nanoTiN). The structure and dispersion properties of the modified nanoTiN were investigated by Fourier transform infrared (FTIR) spectra, X-ray photoelectron spectroscopy (XPS), a sedimentation stability experiment (SSE), a contact angle measuring instrument (CAMI) and a high-resolution transmission electron micrograph (HRTEM). According to the spectra of FTIR and XPS, it can be inferred that the KH-570 and MCA covalently bonded on the surface of nanoTiN and an organic coating layer was formed. The SSE and the CAMI showed that the stable dispersion and the hydrophobic property were improved significantly. The results of the HRTEM showed that the surfactants improved the dispersibility of particles in the organic solution and the SBR matrix. It is found that the MCA can more effectively improve the dispersion stability of nanoTiN because of a more strong steric stabilisation of the macromolecular structure, which facilitated to hinder the aggregation of nanoparticles.

Modification of SiO2 Nanoparticle-Decorated TiO2 Nanocomposites with Silane Coupling Agents for Enhanced Opacity in Blue Light-Curable Ink

“…The peaks at 529.4, 532.1, and 532.7 eV are attributed to the O 1s of KH570- SiO 2 /TiO 2 in the Ti–O bond, C–O bond, and Si–O–Si/Si–O–Ti bond, respectively. The peaks at 529.4, 530.2, 532.1, and 532.7 eV are attributed to the O 1s of KH570-SiO 2 /TiO 2 nanocomposites in the Ti–O bond, OC–O bond, C–O bond, and Si–O–Si/Si–O–Ti bond. , The elemental content of the samples is shown in Table S1. As shown in Table S1, it is difficult to analyze the successful grafting of the silane coupling agent by the content of the elements.…”

“…The representative XPS spectra of the surface of KH570-SiO 2 /TiO 2 nanocomposites and GPTMS−SiO 2 /TiO 2 nanocomposites are presented in Figure 6b 38,39 The elemental content of the samples is shown in Table S1. As shown in Table S1, it is difficult to analyze the successful grafting of the silane coupling agent by the content of the elements.…”

Effect of multi-walled carbon nanotubes with different diameters on morphology and thermal and mechanical properties of flexible polyurethane foams

“…The neat polyol viscosity was independent of the shear rate and showed a Newtonian behavior. 17 However, the MWCNT/polyol mixture had a higher viscosity and exhibited a shear-thinning behavior with increasing shear rate. This is related to the movement of MWCNTs in polyols under shear action.…”

“…1,15,16 Meanwhile, this is an effect of the nanoparticles, that act as a pore nucleation agent and enhance the matrix viscosity. 12,13,17 The cell size of the MWCNT-2/PUF composites changed unevenly with increases in the MWCNT dosage (0.6 wt%) (Figure 2(d)). These results may be due to the MWCNT aggregation at a high dosage (0.6 wt%).…”

“…Such aggregation prevents the filler from acting as a suitable nucleating agent resulting in larger and uneven cell sizes for the flexible PUF composites. 13,17 Figure 3 shows the stable shear viscosities of pure polyol and the MWCNT/polyol matrix. The neat polyol viscosity was independent of the shear rate and showed a Newtonian behavior.…”