Organic surface modification and analysis of titania nanoparticles for self‐assembly in multiple layers

Abstract

The characteristics of TiO2 coatings can greatly influence their final performance in large‐scale applications. In the present study, self‐assembly of TiO2 nanoparticles (NPs) in multiple layers was selected as a deposition procedure on various substrates. For this, the main prerequisite constitutes the surface modification of both NPs and substrate with, for example, silane coupling agents. A set of functionalized TiO2 NPs has been produced by reaction with either (3‐aminopropyl)triethoxysilane (APTES) or (3‐aminopropyl)phosphonic acid (APPA) to functionalize the NP surface with free amino‐groups. Then, the complementary functionalized NP set can be obtained from an aliquot of the first one, through the conversion of free surface amino groups to aldehydes by reaction with glutaraldehyde (GA). Several types of TiO2 NPs differing in size, shape, and specific surface area have been functionalized. Fourier‐transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM/ energy‐dispersive X‐ray spectroscopy (EDS), XPS, Auger electron spectroscopy (AES), and Time‐of‐Flight (ToF)‐SIMS analyses have been carried out to evaluate the degree of functionalization, all the analytical methods employed demonstrating successful functionalization of TiO2 NP surface with APTES or APPA and GA.

Customizing New Titanium Dioxide Nanoparticles with Controlled Particle Size and Shape Distribution: A Feasibility Study Toward Reference Materials for Quality Assurance of Nonspherical Nanoparticle Characterization

“…In practical applications, TiO 2 can be often found as thin and thick layers with structures at the nanoscale, either as porous material or as densely packed nanoparticles, including also their functionalization. [25,26] Two representative examples are shown in Figure 3. First is a TiO 2 coating synthesized by pulsed DC magnetron sputtering for photocatalysis applications, where microstructure, phase, orientation, and porosity at the nanoscale through the %1 μm-thick layer play a decisive role.…”

Study on the Properties of Cellulose Acetate Composite Synergistically Toughened by Glycerol Triacetate and Modified Nano Titania

“…The agglomeration of nano TiO 2 can be effectively reduced by surface modification of the coupling agent [7] . In addition, coupling agent-modified nano titanium dioxide can increase the force between inorganic filler and polymer, improving materials' comprehensive properties [8][9][10][11] . The operation of surface modification is convenient and effectively improves the agglomeration of nanofillers, increases the force between fillers and matrix, significantly improves the comprehensive performance of materials, and provides a practical idea for the modification of cellulose acetate.…”

Solvothermal synthesis of soluble, surface modified anatase and transition metal doped anatase hybrid nanocrystals

“…An increasingly popular alternative to vapour phase methods is the generation of solution processable metal oxide nanoparticles. [24][25][26] This approach offers exceptional exibility, both chemicallysimple wet-chemical techniques permit the synthesis of a wide range of compositionsand physically, as dispersions of preformed colloidal nanocrystals may be used to coat at substrates, irregularly shaped objects or may be used to generate supported catalysts or composites and gels. [27][28][29][30][31][32] There has been a growing research effort in this eld, such that dispersible nanocrystals of TiO 2 , SnO 2 , CeO 2 , ZnO, MnO, and others have been accessed by methods including non-aqueous sol-gel synthesis, solvothermal/ hydrothermal synthesis, hot-injection, and thermolysis.…”