Thermokinetic analysis of the stability of malic and salicylic acids in cosmeceutical formulations containing metal oxides

2017 ◽  
Vol 132 (1) ◽  
pp. 165-172 ◽  
Author(s):  
An-Chi Huang ◽  
Yu-Kai Chuang ◽  
Chung-Fu Huang ◽  
Chi-Min Shu
Keyword(s):  
Metal Oxides ◽  
Thermokinetic Analysis ◽  
The Stability ◽  
Salicylic Acids

scholarly journals Approaching Bulk from the Nanoscale: Extrapolation of Binding Energy from Rock-Salt Cuts of Alkaline Earth Metal Oxides

2021 ◽  
Vol 74 ◽  
Author(s):  
Susanne G.E.T. Escher ◽  
Helen D. Duncan ◽  
Alexey A. Sokol ◽  
Scott M. Woodley
Keyword(s):  
Metal Oxides ◽  
Rock Salt ◽  
Alkaline Earth ◽  
Global Minimum ◽  
Minimum Energy ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Bulk Rock ◽  
Alkaline Earth Metal Oxides ◽  
The Stability

ABSTRACT A systematic DFT study is performed on (MgO)B, (CaO)n, (SrO)n, and (BaO)n clusters with 6 < n < 50, and which display a cuboid 2X2X2 atomic motif seen in the bulk, rock-salt, configuration. The stability and energy progression of these clusters are used to predict the energies of infinitely long nanorods, or nanowires, slabs, and the bulk global minimum energy. Keywords: Alkaline earth metal oxides, nanoclusters, nanorods, DFT.

scholarly journals Synthesis and Characterisation of New {Fe2CrO} Heterotrinuclear Iron-chromium Clusters

2021 ◽  
Author(s):  
Viorina Gorinchoy ◽  
Olesea Cuzan ◽  
Silvia Melnic ◽  
Oleg Petuhov ◽  
Sergiu Shova
Keyword(s):  
Thermal Properties ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Elemental Analysis ◽  
Atomic Absorption Spectroscopy ◽  
X Ray ◽  
Heteronuclear Complexes ◽  
The Stability ◽  
Iron Chromium ◽  
Salicylic Acids

Two new μ3-oxo trinuclear heterometallic Fe2IIICrIII complexes with furan-2-carboxylic and salicylic acids with the composition: [Fe2CrO(C4H3OCOO)6(CH3OH)3]NO3·0.5CH3OH and [Fe2CrO(C6H4(OH)COO)7(CH3OH)2]·2DMA were synthesized starting from iron(III) and chromium(III) salts mixture. The complexes structures were confirmed by elemental analysis, IR, Mössbauer spectroscopies, and X-ray analysis. The atomic absorption spectroscopy confirmed that the iron: chromium ratio is 2:1. The thermal properties of both heteronuclear complexes have been investigated in oxidizing and inert atmospheres revealing the stability of the trinuclear core up to 170 and 220°C, respectively.

(Invited) In-Situ Study of the Activated Lattice Oxygen Redox Reactions in Metal Oxides during Oxygen Evolution Catalysis

2018 ◽  
Vol MA2018-01 (32) ◽  
pp. 1935-1935
Author(s):  
Binghong Han ◽  
Yang Shao-Horn
Keyword(s):  
Metal Oxides ◽  
Oxygen Evolution ◽  
Perovskite Oxides ◽  
Systematic Investigation ◽  
Lattice Oxygen ◽  
Energy Storage And Conversion ◽  
Electrochemical Tests ◽  
Highly Active ◽  
The Stability

Promoting the oxygen evolution reaction (OER) near room temperature is critical to improve the efficiency of many electrochemical energy storage and conversion techniques, such as water splitting and rechargeable metal-air batteries. Nowadays, researchers have developed many non-precious metal oxides as highly active OER catalysts, including many perovskite oxides (ABO3) of first-row transition metals such as LaCoO3-δ (LCO), SrCoO3-δ (SCO), and Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF). However, understanding the interaction between oxides catalysts and water, which determines the stability and activity of the oxide OER catalysts, is still challenging. Here we report the systematic investigation between water and various perovskite oxides with different electronic structures, using a series of in situ characterization techniques including on-line electrochemical mass spectrometry (OLEMS), environmental transmission electron microscopy (ETEM), and pH-dependent electrochemical tests. It is find that having an oxygen 2p-band closer to the Fermi level and increasing the covalency of metal-oxygen bonds could facilitate the redox reaction of lattice oxygen in perovskites during OER catalysis. In the oxides such as SCO and BSCF with activated lattice oxygen in the OER process, we observe the evolving of 18O-labeled lattice oxygen in OLEMS, the strong pH dependency of OER kinetics in electrochemical measurements, and the structural oscillation in ETEM, which all indicate a new oxygen-site OER mechanism that makes the perovskites more active and less stable. While in the oxides such as LCO with no lattice oxygen activation, all of the above phenomena are missing, implying a stable surface with traditional metal-site OER mechanism. Observing the perovskites in situ during OER allows us to better understand the interaction between electrolytes and oxides, providing us a deeper insight into the stability and active site of oxide catalysts for OER.

STRONG ELECTRON-PHONON COUPLING AND THE ORTHORHOMBIC TO TETRAGONAL TRANSITION IN La2CuO4

1988 ◽  
Vol 02 (05) ◽  
pp. 827-836 ◽  
Author(s):  
S. Barišić ◽  
I. Batistić
Keyword(s):  
Metal Oxides ◽  
Hole Concentration ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
The Stability ◽  
Electron Photon ◽  
Small Polarons ◽  
Photon Coupling

It is proposed that the main contribution to the electron-photon coupling in ionic metals arises from the deformation induced variation of the crystal field on the ionic sites which are involved in conduction. The latter are assumed here to be the oxygen sites in the CuO 2 planes of the layered metal oxides. The coupling of holes on those sites to the tilting mode of the La 2 CuO 4 lattice is investigated in detail. Although the coupling is quadratic in small tilting displacement the large value of the corresponding coupling constant explains the destabilization of the tilted (orthorhombic) La 2 CuO 4 lattice on increasing the hole concentration. It is shown that the holes are suppressing the tilt locally, creating the regions of the tetragonal please, as observed recently in the photogeneration experiments. The stability of the corresponding small polarons (tiltons) is discussed in detail.

A first-principles study of stability of surface confined mixed metal oxides with corundum structure (Fe2O3, Cr2O3, V2O3)

2018 ◽  
Vol 20 (10) ◽  
pp. 7073-7081 ◽  
Author(s):  
A. S. M. Jonayat ◽  
Alan Kramer ◽  
Luca Bignardi ◽  
Paolo Lacovig ◽  
Silvano Lizzit ◽  
...  
Keyword(s):  
Metal Oxides ◽  
First Principles ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
First Principles Study ◽  
Corundum Structure ◽  
Pure Oxide ◽  
The Stability

Surface-confined mixed corundum metal oxides stability is shown to follow the stability trend of their similar pure oxide terminations.

ChemInform Abstract: Rapid Microwave Preparation and ab initio Studies of the Stability of the Complex Noble Metal Oxides La2BaPdO5and La2BaPtO5.

ChemInform ◽  
2014 ◽  
Vol 45 (19) ◽  
pp. no-no
Author(s):  
Lauren M. Misch ◽  
Jakoah Brgoch ◽  
Alexander Birkel ◽  
Thomas E. Mates ◽  
Galen D. Stucky ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Ab Initio ◽  
Noble Metal ◽  
Noble Metal Oxides ◽  
The Stability

Rapid Microwave Preparation and ab Initio Studies of the Stability of the Complex Noble Metal Oxides La2BaPdO5 and La2BaPtO5

2014 ◽  
Vol 53 (5) ◽  
pp. 2628-2634 ◽  
Author(s):  
Lauren M. Misch ◽  
Jakoah Brgoch ◽  
Alexander Birkel ◽  
Thomas E. Mates ◽  
Galen D. Stucky ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Ab Initio ◽  
Noble Metal ◽  
Noble Metal Oxides ◽  
The Stability
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