Dispersion Behavior of Barium Titanate Nanoparticles Prepared by Using Various Polycarboxylic Dispersants

Abstract

The effects of the polycarboxylic dispersant structures on the crystallinity and sedimentation behavior of prepared BaTiO3 nanoparticles were analyzed using four types of dispersants—ethylenediaminetetraacetic acid dipotassium salt (EDTA), trans‐aconitic acid (TAA), ammonium acrylate–methyl acrylate co‐polymer (PAA50), and sodium polyacrylate (PAA100). In the case of EDTA and TAA, the adsorbed ratio of the dispersants on BaTiO3 nanoparticles was relatively low, and only slight improvement of sedimentation behavior was observed. On the other hand, in the case of PAA50 and PAA100, the adsorbed ratio was high, and the sedimentation behavior was gratefully improved. Next, in order to analyze the relationships among the additive amount of polycarboxylic dispersants, crystallinity, and sedimentation behavior, various amounts of PAA100 or PAA50 were treated in the synthesis solution. The sedimentation behavior of BaTiO3 nanoparticles improved with increasing amounts of PAA100 and PAA50 while their crystal phase became amorphous. Adding PAA50 at a molar ratio of COO−/Ba2+=0.266 resulted in BaTiO3 nanoparticles with the best dispersion stability in an aqueous media.

Synthesis and size control of monodispersed BaTiO3–PVP nanoparticles

“…These two methods require two steps to realize re-dispersion. In contrast, the polymer dispersant is directly added to the reaction solution with the raw material for nanoparticle synthesis in the third method [19][20][21][22][23][24], which can simply resolve issues regarding dispersion and particle size in a single step.…”

Comparison of Methods for Surface Modification of Barium Titanate Nanoparticles for Aqueous Dispersibility: Toward Biomedical Utilization of Perovskite Oxides

“…The citrate coating method allowed the BT NPs to achieve high dispersibility in aqueous media up to 50 mg/mL. This level of dispersibility of colloidal BT NP in aqueous solutions is significantly higher than previously reported. − The size of the particles also remained small (11 nm) as the coating was via a single layered molecular adsorption. However, the colloidal stability of BT@citrate is largely affected by the ionic strength in the aqueous solution.…”

BaTiO3-based thermistor hollow fibers prepared using a phase inversion spinning process for energy efficient gas sorption

“…Increased dispersion has been observed for BaTiO 3 nanoparticles due to the adsorption of ammonium acrylatemethyl acrylate (PAA50), resulting from interaction between COO − polymer groups and surface Ba 2+ . Therefore, a similar mechanism may also occur between Ba 2+ and the ester groups of PMMA [53]. However, BTOL-S-1350-2-1 has the lowest density and highest surface area of all specimens studied, which suggests that PMMA inhibits de-agglomeration, which promotes pore formation during sintering.…”