Formation of Acceptor States on the Silicon Hydroxylated Surface Upon NO2 Molecules Adsorption

2017 ◽  
Vol 255 (3) ◽  
pp. 1700499 ◽  
Author(s):  
Fedor Ptashchenko
Keyword(s):  
Hydroxylated Surface

scholarly journals Hydroxylated surface of GaAs as a scaffold for a heterogeneous Pd catalyst

2012 ◽  
Vol 14 (4) ◽  
pp. 1424-1430 ◽  
Author(s):  
Nagatoshi Nishiwaki ◽  
Tomoya Konishi ◽  
Shotaro Hirao ◽  
Yoshiyuki Yamashita ◽  
Hideki Yoshikawa ◽  
...  
Keyword(s):  
Pd Catalyst ◽  
Hydroxylated Surface

scholarly journals Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 450 ◽  
Author(s):  
Zhang ◽  
Xu ◽  
Hu ◽  
He ◽  
Tian ◽  
...  
Keyword(s):  
Sodium Oleate ◽  
Density Functional ◽  
Population Analysis ◽  
Water Molecules ◽  
Mulliken Population ◽  
Flotation Reagents ◽  
Functional Theory ◽  
Rigorous Study ◽  
Adsorption Energies ◽  
Hydroxylated Surface

A scientific and rigorous study on the adsorption behavior and molecular mechanism of collector sodium oleate (NaOL) on a Ca2+-activated hydroxylated α-quartz surface was performed through experiments and density functional theory (DFT) simulations. The rarely reported hydroxylation behaviors of water molecules on the α-quartz (101) surface were first innovatively and systematically studied by DFT calculations. Both experimental and computational results consistently demonstrated that the adsorbed calcium species onto the hydroxylated structure can significantly enhance the adsorption of oleate ions, resulting in a higher quartz recovery. The calculated adsorption energies confirmed that the adsorbed hydrated Ca2+ in the form of Ca(H2O)3(OH)+ can greatly promote the adsorption of OL− on hydroxylated quartz (101). In addition, Mulliken population analysis together with electron density difference analysis intuitively illustrated the process of electron transfer and the Ca-bridge phenomenon between the hydroxylated surface and OL− ions. This work may offer new insights into the interaction mechanisms existing among oxidized minerals, aqueous medium, and flotation reagents.

Synthesis and luminescence properties of colloidal lanthanide doped YVO4

2001 ◽  
Vol 667 ◽  
Author(s):  
Arnaud Huignard ◽  
Thierry Gacoin ◽  
Frédéric Chaput ◽  
Jean-Pierre Boilot ◽  
Patrick Aschehoug ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Room Temperature ◽  
Sol Gel ◽  
Precursor Solution ◽  
Silica Matrix ◽  
Luminescence Quantum Yield ◽  
Colloidal Solutions ◽  
Silicon Alkoxide ◽  
Crystalline Defects ◽  
Hydroxylated Surface

ABSTRACTAqueous colloidal solutions of well dispersed YVO4:Ln (Ln = Eu, Nd) nanoparticles are synthesized through precipitation reactions at room temperature. In the case of YVO4:Eu, a luminescence quantum yield of 15% is found, which is not as high as in the bulk due to the existence of residual crystalline defects and nonradiative relaxations from the hydroxylated surface. Appropriate hydrothermal annealing and deuteration of the surface allow to rise the yield up to 38%. Incorporation of the nanocrystals into a transparent silica matrix is achieved through preliminary coating of the particles with a functionnalized silicon alkoxide and further dispersion into a sol-gel precursor solution. Such sol-gel materials doped with YVO4:Nd nanocrystals are transparent and exhibit the typical emission at 1.06 μm of the Nd3+ ion.

Interaction between Water and Hydroxylated Surface of Silica-Alumina

1974 ◽  
Vol 47 (12) ◽  
pp. 2994-2997 ◽  
Author(s):  
Tetsuo Morimoto ◽  
Mahiko Nagao ◽  
Junichiro Imai
Keyword(s):  
Silica Alumina ◽  
Hydroxylated Surface

Ozonation catalyzed by iron silicate for the degradation of o-chloronitrobenzene in drinking water

2012 ◽  
Vol 12 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Y. Liu ◽  
Z. Chen ◽  
L. Yang ◽  
Y. Han ◽  
J. Shen ◽  
...  
Keyword(s):  
Active Species ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Radical Scavenger ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Hydroxyl Radical Scavenger ◽  
Silicate Surface ◽  
Ozonation Process ◽  
Hydroxylated Surface

This paper aimed to reveal the effectiveness and the mechanism of catalytic ozonation in the presence of iron silicate for the degradation of o-chloronitrobenzene (oCNB). Experimental results show that catalytic ozonation in the presence of iron silicate could substantially enhance oCNB removal efficiency compared with ozonation alone, and that the adsorption of oCNB on the iron silicate surface had no significant effect on the degradation of oCNB. The results of a hydroxyl radical scavenger experiment using spin-trapping/EPR technology to identify hydroxyl radicals (•OH) confirm that •OH were the main active species in the removal of oCNB during the ozonation process catalyzed by iron silicate. The catalytic activity of the iron silicate was related to a highly hydroxylated surface. It was confirmed that the surface hydroxyl groups on the iron silicate were the reaction sites between ozone and oCNB.

Sandwich-like multi-scale hierarchical porous carbon with highly hydroxylated surface for flow batteries

2020 ◽  
Author(s):  
Rui Wang ◽  
Yinshi Li ◽  
Haiying Liu ◽  
Y.L. He ◽  
Mingsheng Hao
Keyword(s):  
Porous Carbon ◽  
Cycling Stability ◽  
Hierarchical Porous Carbon ◽  
Flow Battery ◽  
Multi Scale ◽  
High Reaction ◽  
Hierarchical Porous ◽  
Flow Batteries ◽  
Hydroxylated Surface

High reaction activity and cycling stability are essential to commercialize electrodes in vanadium flow battery (VFB) and zinc-bromine flow battery (ZBFB). In this work, a sandwich-like multi-scale pore-rich hydroxylated carbon...

scholarly journals Synthesis, structural characterization and Cu(ii) adsorption behavior of manganite (γ-MnOOH) nanorods

RSC Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 179-186
Author(s):  
L. F. Cano-Salazar ◽  
A. Martínez-Luévanos ◽  
J. A. Claudio-Rizo ◽  
F. R. Carrillo-Pedroza ◽  
S. M. Montemayor ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Adsorption Behavior ◽  
Spontaneous Process ◽  
Hydroxylated Surface

Manganite (γ-MnOOH) nanorods were synthesized and Cu(ii) adsorption on their hydroxylated surface was a spontaneous process (ΔG° < 0).

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