Tailoring nano-catalysts: turning gold nanoparticles on bulk metal oxides to inverse nano-metal oxides on large gold particles

2015 ◽  
Vol 51 (27) ◽  
pp. 5975-5978 ◽  
Author(s):  
Guofeng Zhao ◽  
Xin-Ping Wu ◽  
Ruijuan Chai ◽  
Qiaofei Zhang ◽  
Xue-Qing Gong ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Metal Oxides ◽  
High Activity ◽  
Gas Phase ◽  
Gold Particle ◽  
Alcohol Oxidation ◽  
Bulk Metal ◽  
Gold Particles ◽  
Nano Oxide ◽  
Nano Catalysts

Inverse nano-oxide/large-gold-particle catalysts create an anti-sintering structure with a large interface thereby showing high activity/selectivity for the gas-phase alcohol oxidation with dramatic stability improvement.

Preparation and isolation of gold nanoparticles coated with a stabilizer and sol-gel compatible agent

2002 ◽  
Vol 17 (8) ◽  
pp. 1973-1980 ◽  
Author(s):  
R. Trbojevich ◽  
N. Pellegri ◽  
A. Frattini ◽  
O. de Sanctis ◽  
P. J. Morais ◽  
...  
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Gold Particle ◽  
Reverse Micelle ◽  
Formation Process ◽  
Sol Gel ◽  
Particle Growth ◽  
Gold Particles ◽  
Surface Modifiers

In this work an attractive technique is presented that brings together the advantage of the micelle reverse technique to control the particle growth and the efficiency of the amine silanes as sol-gel-compatible surface modifiers. The diamino silane is far from being a passive agent in the formation process of the gold particle; it strongly modifies the growth of the gold particle in the reverse micelle. The diamino silane allows the gold particles to keep their individual properties unaltered throughout the process, which ends with their incorporation into a SiO2–TiO2 sol-gel thin film.

The influence of transition metal oxides on the kinetics of Li2O2oxidation in Li–O2batteries: high activity of chromium oxides

2014 ◽  
Vol 16 (6) ◽  
pp. 2297-2304 ◽  
Author(s):  
Koffi P. C. Yao ◽  
Yi-Chun Lu ◽  
Chibueze V. Amanchukwu ◽  
David G. Kwabi ◽  
Marcel Risch ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
High Activity ◽  
Transition Metal Oxides ◽  
Chromium Oxides ◽  
Kinetics Of

Bulk Metal Oxides as a Model for the Electronic Properties of Passive Films

1995 ◽  
Vol 142 (10) ◽  
pp. 3336-3342 ◽  
Author(s):  
P. Schmuki ◽  
M. Büchler ◽  
S. Virtanen ◽  
H. Böhni ◽  
R. Müller ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Electronic Properties ◽  
Passive Films ◽  
Bulk Metal

A method for determining the periodicity of a troponin component in isolated insect flight muscle thin filaments by gold/Fab labelling

1992 ◽  
Vol 101 (3) ◽  
pp. 503-508
Author(s):  
R. Newman ◽  
G.W. Butcher ◽  
B. Bullard ◽  
K.R. Leonard
Keyword(s):  
Gold Particle ◽  
Colloidal Gold ◽  
Striated Muscle ◽  
Flight Muscle ◽  
Insect Flight ◽  
Insect Flight Muscle ◽  
Fab Fragment ◽  
Thin Filaments ◽  
Gold Particles ◽  
Almost All

Insect flight muscle has a large component (Tn-H) in the tropomyosin-troponin complex that is not present in vertebrate striated muscle thin filaments. Tn-H is shown by gold/Fab labelling to be present at regular intervals in insect flight muscle thin filaments. The Fab fragment of a monoclonal antibody to Tn-H was conjugated directly with colloidal gold and this probe used to label isolated thin filaments from the flight muscle of Lethocerus indicus (water bug). The distribution of gold particles seen in electron microscope images of negatively stained thin filaments was analysed to show that the probe bound to sites having a periodicity of approximately 40 nm, which is the expected value for the tropomyosin-troponin repeat. Conjugates of Fab with colloidal gold particles of 3 nm diameter labelled almost all sites. Conjugates with gold particles of 5 nm and 10 nm diameter labelled less efficiently (70% and 30%, respectively) but analysis of the distribution of inter-particle intervals among a number of filaments again gave the same fundamental spacing of 40 nm. The error in the measurements (standard deviation approximately +/− 4.2 for 5 nm gold/Fab) is less than earlier estimates for the size of the gold/Fab complex. Measurements on gold/Fab in negative stain suggest that the bound Fab contributes a shell about 2 nm in thickness around the gold particle. The radius of the probe (about 4.5 nm for 5 nm gold/Fab) would then be consistent with the value of error found. The size of the probe suggests that the gold particle binds to the side of the Fab molecule, rather close to the antibody combining site. The potential resolution of the technique may thus be better than originally expected.

Transcription methodology for rationally designed morphological complex metal oxides: A versatile strategy for improved electrocatalysis

2021 ◽  
Author(s):  
Sourav Bhowmick ◽  
Manoj Kumar Mohanta ◽  
Mohammad Qureshi
Keyword(s):  
High Temperature ◽  
Metal Oxides ◽  
High Activity ◽  
High Temperatures ◽  
Complex Metal ◽  
Complex Metal Oxides

Complex metal oxides such as 3D perovskites, known for their high activity and stability, are traditionally synthesized at high temperatures leaving little scope for morphological tuning using structure-directing and high-temperature...

How Recyclability can Reduce Induction Period of Gold Nanocatalysts

2019 ◽  
Vol 57 ◽  
pp. 1-6 ◽  
Author(s):  
Sedigheh Ghadamgahi
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Gold Particle ◽  
Particle Diameter ◽  
Gold Catalysts ◽  
Gold Particles ◽  
Transmission Electron ◽  
The Mean ◽  
Full Conversion ◽  
Catalytic Test

The effect of recyclability on the catalytic activity of supported Au101(PPh3)21Cl5 nanoparticles (1.0 wt% Au101/AC) was investigated for benzyl alcohol oxidation under mild conditions. The influence of recyclability on the catalytic activity of activated Au101/AC nanocatalysts was studied trough a comparison of gold particle diameter and also catalysts conversion between the fresh (as synthesized) and recycled gold catalysts. The monitoring of gold particle diameters by transmission electron microscopy (TEM) showed that the gold particles size gradually increased during the catalytic reaction. The mean diameter of the fresh gold catalysts increased from approximately 3 to 3.2, 5.1 and 5.3 nm after 1, 2 and 3 h reaction time, respectively. Whereas the average gold particle diameter of the recycled samples were slightly enlarged from approximately 5.3 (the sample recycled after 3 h of the first catalytic test) to 5.7, 5.9 and 6.2 nm with durations of 1, 2 and 3 h reaction time, respectively. Therefore, larger gold particles gradually formed for fresh and also recycled gold catalysts during reaction tests. Meanwhile, the catalytic activity of activated 1.0 wt% Au101/AC catalysts jumped to full conversion when the recycled gold catalysts were utilized due to removing ligand stabilizer from gold particles and so bigger particles had formed.

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