| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 237157 | Powder Technology | 2012 | 6 Pages |
Monodispersed spheroid BaSO4 nano powders with porous structures were synthesised via a facile single step procedure. Liquid–liquid chemosynthesis involving direct precipitation of BaCl2 and (NH4)2SO4 in aqueous polyvinyl alcohol (PVA) solution as a polymeric template was employed. PVA, a polymeric surfactant, acts as a template for particle growth and assists morphology control and can be easily removed after synthesis by calcination. The dried and calcined nano powders were characterised by X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermo gravimetric analysis (TGA). The studies revealed that the porosity and size of the particle were highly governed by PVA content and calcination temperatures. The powder synthesised in 3% w/v PVA showed an average particle size ranging from 20 to 23 nm. The monodispersed porous powders were stable and showed spheroid like structures up to 600 °C; after which the nano structure is lost drastically and agglomeration leads to structure collapse forming lumpy flakes.
Graphical abstractFacile liquid-liquid chemosynthesis of porous and monodispersed BaSO4 nano powders in aqueous media at ambient condition to obtain nano powder with particle size in the range 20–23 nm. PVA solution was successfully employed as template at a concentration range of 3% herewith and particles characterised using XRD, SEM, Particle analyser, TEM, TGA and FTIR.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Chemosynthesis involved direct precipitation — aqueous PVA act as polymeric template. ► XRD, SEM, and TEM revealed that 3% aqueous PVA solution is an optimum medium for synthesis. ► Facile synthesis yielding porous monodispersed BaSO4 nano powders of size 20–23 nm. ► Thermal studies revealed structural stability up to 600 °C.
