Copper Metallic Particles Synthesized "in Situ" in Reverse Micelles: Influence of Various Parameters on the Size of the Particles

1995 ◽  
Vol 99 (14) ◽  
pp. 5077-5082 ◽  
Author(s):  
I. Lisiecki ◽  
M. P. Pileni
Keyword(s):  
Reverse Micelles ◽  
Metallic Particles

SREM observation of the interaction between the in-situ deposited Pd small particles and MgO cleavage surface

1986 ◽  
Vol 44 ◽  
pp. 382-383
Author(s):  
H.-J. Ou
Keyword(s):  
Electron Microscopy ◽  
Small Particle ◽  
Small Particles ◽  
Cleavage Surface ◽  
Metallic Particles ◽  
Microscopy Technique ◽  
Ceramic Surfaces ◽  
Reflection Electron Microscopy ◽  
New Perspective

The understanding of the interactions between the small metallic particles and ceramic surfaces has been studied by many catalyst scientists. We had developed Scanning Reflection Electron Microscopy technique to study surface structure of MgO hulk cleaved surface and the interaction with the small particle of metals. Resolutions of 10Å has shown the periodic array of surface atomic steps on MgO. The SREM observation of the interaction between the metallic particles and the surface may provide a new perspective on such processes.

Genesis of Pt Clusters in Reverse Micelles Investigated by in Situ X-ray Absorption Spectroscopy

2004 ◽  
Vol 108 (24) ◽  
pp. 8148-8152 ◽  
Author(s):  
Yin W. Tsai ◽  
Yu L. Tseng ◽  
Loka S. Sarma ◽  
Din G. Liu ◽  
Jyh F. Lee ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Reverse Micelles ◽  
X Ray ◽  
X Ray Absorption

Strengthening Effect of In-Situ Dispersed Hexagonal Boron Nitride in Ceramic Composites

2006 ◽  
Vol 317-318 ◽  
pp. 163-166
Author(s):  
Guo Jun Zhang ◽  
Hideki Kita ◽  
Naoki Kondo ◽  
Tatsuki Ohji
Keyword(s):  
Grain Size ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
High Strength ◽  
Ceramic Composites ◽  
Strengthening Effect ◽  
Mechanical Shock ◽  
Metallic Particles ◽  
Reactive Hot Pressing

High strength particulate ceramic composites are in general reinforced by strong dispersoids, such as strong ceramic particles (SiC, TiB2, ZrO2, et al) and strong metallic particles (Mo, W, et al). In this work high strength ceramic composites with in-situ synthesized hexagonal boron nitride (h-BN) have been prepared and characterized. As an example, we manufactured mullite-BN composites by reactive hot pressing (RHP) using aluminum borates (9Al2O3·2B2O3 and 2Al2O3·B2O3) and silicon nitride as starting materials. The obtained material RHPed at 1800°C showed a strength of 540 MPa, which was 1.64 times higher than that of the monolithic mullite ceramics. TEM observation revealed that the composite had an isotropic microstructure with a fine mullite matrix grain size of less than 1 μm and a nano-sized h-BN platelets of about 200 nm in length and 60∼80 nm in thickness. The high strength was suggested to be from the reduced matrix grain size and the small toughening effect by the h-BN platelets. In addition, this kind of ceramic composite demonstrates low Young’s modulus that is beneficial to the thermal/mechanical shock resistance, and excellent machinability.

Synthesis of PbS Semiconductor Microcrystallites In Situ in Reverse Micelles

1994 ◽  
Vol 358 ◽  
Author(s):  
O. De Sanctis ◽  
K. Kadono ◽  
H. Tanaka ◽  
T. Sakaguchi
Keyword(s):  
Particle Size ◽  
Reverse Micelles ◽  
Transition Energy ◽  
Four Wave Mixing ◽  
Nonlinear Property ◽  
Reversed Micelles ◽  
Wave Mixing ◽  
Spectroscopic Characteristics ◽  
Semiconductor Particles

ABSTRACTColloid semiconductor particles of PbS have been prepared in reversed micelles of AOT-heptane. The effects of the AOT, water and reactants concentrations have been studied. The initial crystallite size and its growth with the time aging are strongly dependent on the water/AOT ratio and the ionic pool concentration. The absorption spectroscopic characteristics of the PbS particles have been examined. As the particle size decreases the band gap shifts in color from orange-brown to yellow and approaches the transition energy of the first allowed excited state of a PbS molecule. Moreover, the optical nonlinear property of PbS particles was investigated by Degenerate Four-Wave Mixing (DFWM) experiment using a frequency-doubled Nd:YAG laser.

In-Situ Formation of Silver Nanoparticles Using Nonionic Surfactant Reverse Micelles as Nanoreactors

2014 ◽  
Vol 14 (3) ◽  
pp. 2238-2244 ◽  
Author(s):  
Lok Kumar Shrestha ◽  
Rekha Goswami Shrestha ◽  
Neus Vilanova ◽  
Carlos Rodriguez-Abreu ◽  
Katsuhiko Ariga
Keyword(s):  
Silver Nanoparticles ◽  
Nonionic Surfactant ◽  
Reverse Micelles ◽  
In Situ Formation

Synthesis “in situ” in reverse micelles of silver sulfide semiconductors

2007 ◽  
pp. 189-192 ◽  
Author(s):  
L. Motte ◽  
F. Billoudet ◽  
J. Cizeron ◽  
M. P. Pileni ◽  
L. Motte ◽  
...  
Keyword(s):  
Reverse Micelles ◽  
Silver Sulfide
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