Role of the Surface Chemistry of Ceria Surfaces on Silicate Adsorption

Abstract

Ceria nanoparticles (NPs) have been widely explored as a promising material in various fields. As synthesized under various physicochemical conditions, it exhibits the different surface chemistry. Here, the role of hydroxyl and nitrate group on ceria surface, formed under various physicochemical conditions, for the silicate adsorption was experimentally and theoretically investigated based on the adsorption isotherms and theoretical analyses using density functional theory (DFT) calculation. Experimental results acquired from adsorption isotherms with Freundlich model indicated that the nitrate group shows a much higher affinity with silicate than the hydroxyl groups. These phenomena were demonstrated through the theoretical approaches that exhibit the binding energy of the NO3-ceria (-4.383 eV) on the SiO2 surface being much higher than that of the OH-ceria (-3.813 eV). In good agreement with the experimental and the theoretical results based on adsorption properties, the results of chemical mechanical planarization (CMP) also show that the nitrate groups significantly enhance the removal of SiO2 than the hydroxyl groups. The results investigated in this study will provide researchers, studying the ceria NPs, with guidelines on the importance of exploring the surface chemistry of ceria.

Toward Functional 3D Architectured Platform: Advanced Approach to Anchor Functional Metal Oxide onto 3D Printed Scaffold

“…Figure shows electokinetic behaviors of PLA and two different CeO 2 dispersion. CeO 2 dispersion shows positive charge from pH 3 to pH 9, in a good agreement with previous report . PLA possessing negative charge through the entire pH value exhibits minimum zeta potential value of −47.01 mV at pH 9.…”

“…Additional functional group generated by UVO treatment induces more negative charge on the surface of PLA . CeO 2 , one of positively charged materials, was selected as a coating material . The amount of deposited CeO 2 can be controlled by irradiating UV‐Ozone (UVO) onto PLA surface and adjusting the pH of coating suspension.…”

Understanding ligand–nanoparticle interactions for silica, ceria, and titania nanopowders

“…Nanomaterials are highly attractive to current industry and emerging technology [1][2][3][4][5][6][7][8][9][10][11][12][13]. Among the nanomaterials available in the market, ceramic nanopowders, especially silica, ceria, and titania, have been employed extensively as important components in nanomaterials-enabled products [7][8][9][14][15][16][17].…”

“…Among the nanomaterials available in the market, ceramic nanopowders, especially silica, ceria, and titania, have been employed extensively as important components in nanomaterials-enabled products [7][8][9][14][15][16][17]. For examples, silica and ceria nanopowders can be used as abrasive particles in a variety of slurry products for chemical mechanical planarization in the manufacture of electronic industry [7][8][9]. The specific nano-scale dimension can induce strong particle-wafer contact for the delivery of the mechanical force and the formulants involved in the contact.…”

“…Bovine serum albumin (BSA), sodium dodecyl sulfate (SDS), and cetyltrimethylammonium bromide (CTAB) were chosen as representative ligands due to high interest in these ligands in current technology [7][8][9]11,12,16,17,23,24]. BSA is an amphoteric protein molecule (the isoelectric point, IEP, %5) and has shown to be the most widely used serum protein due to its wide availability and structural/functional similarity to human serum albumin [25].…”