Grafting of alumina by diphenylphosphinate coupling agents

2000 ◽  
Vol 628 ◽  
Author(s):  
Gilles Guerrero ◽  
Gérald Chaplais ◽  
P. Hubert Mutin ◽  
Jean Le Bideau ◽  
Dominique Leclercq ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Crystalline Phase ◽  
Surface Complexation ◽  
Organic Medium ◽  
Coupling Agents ◽  
Surface Phase ◽  
Alumina Particles ◽  
Surface Phase Transformation

ABSTRACTAlumina particles were treated under various conditions with different diphenylphosphinate compounds: diphenylphosphinic acid, ethyl diphenylphosphinate, and trimethylsilyl diphenylphosphinate. The balance between surface complexation (namely grafting) and surface phase transformation (formation of bulk aluminum phosphinate phase) was investigated by IR and solid-state 31P MAS NMR spectroscopy, using the model crystalline phase Al(O2PPh2)3 synthesized in a parallel work as a reference. Satisfactory grafting was obtained either by using diphenylphosphinic acid in aqueous medium at pH about 6, or by using ethyl diphenylphosphinate in organic medium as coupling agents.

Mechanism of an adsorbate-induced surface phase transformation: CO on Pt(100)

1982 ◽  
Vol 121 (2) ◽  
pp. L553-L560 ◽  
Author(s):  
P.A. Thiel ◽  
R.J. Behm ◽  
P.R. Norton ◽  
G. Ertl
Keyword(s):  
Phase Transformation ◽  
Surface Phase ◽  
Surface Phase Transformation

Surface Phase Transformation Analysis of Nanozirconia Toughened Alumina Ceramics under Two-Dimentional Ultrasonic Vibration Grinding

2010 ◽  
Vol 42 ◽  
pp. 259-262
Author(s):  
Yan Yan Yan ◽  
Pei Lin Xu ◽  
Bo Zhao
Keyword(s):  
Phase Transformation ◽  
Ultrasonic Vibration ◽  
Xrd Analysis ◽  
Processing Method ◽  
Surface Phase ◽  
Alumina Ceramics ◽  
Processing Property ◽  
Transformation Ratio ◽  
Surface Phase Transformation ◽  
Ultrasonic Vibration Assisted Grinding

Based on good processing property of two-dimentional ultrasonic vibration assisted grinding (TUVAG), phase transformation in the grinding surface of nanozirconia toughened alumina ceramics (ZTA ceramics) is studied by XRD analysis. Experimental results show different processing method and grinding depth may lead to surface phase transformation of ZTA ceramics. Under the same grinding parameters, phase transformation ratio of grinding surface under TUVAG is higher than that under diamond grinding (DG), and its phase transformation ratio increases with the increasing of grinding depth. Phase transformation ratio can effectively inhibit generation and expansion of microcracks of grinding surface.

In situ monitoring of the c( 4 × 4) to the 2 × 4 surface phase transformation on GaAs(001) by grazing incidence X-ray diffraction

1994 ◽  
Vol 320 (3) ◽  
pp. 252-258 ◽  
Author(s):  
V.H. Etgens ◽  
M. Sauvage-Simkin ◽  
R. Pinchaux ◽  
J. Massies ◽  
N. Jedrecy ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Grazing Incidence ◽  
In Situ Monitoring ◽  
Surface Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Phase Transformation
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