Related Experiment Video
Updated: Feb 7, 2026

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
Published on: February 5, 2016
Size controllable redispersion of sintered Au nanoparticles by using iodohydrocarbon and its implications
Xinping Duan1, Xuelin Tian1, Jinhuo Ke1
1State Key Laboratory of Physical Chemistry of Solid Surfaces , National Engineering Laboratory for Green Chemical Production of Alcohols-Ethers-Esters , Collaborative Innovation Center of Chemistry for Energy Materials , College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China .
Abstract:
Downsizing large Au particles into small particles with controllable size remains challenging. In this study, we redispersed large sintered Au particles on activated carbon (Au/C) to highly dispersed nanoparticles with uniform distribution and controllable size after treatment with iodohydrocarbons. The Au/C catalyst was conducted for a number of deactivation/regeneration cycles with negligible deterioration in catalytic performance for acetylene hydrochlorination. The redispersion behavior reveals a reverse agglomeration process in the presence of iodohydrocarbons under mild conditions. This behavior is significantly related to the C-I bond dissociation energy (BDE) and adsorption of iodic species on Au particles. A novel protocol for controlling the size and predicting the redispersion efficiency of Au particles is established by correlating with the C-I BDEs of iodohydrocarbons. The molecular-level interpretation of redispersion provides a thorough mechanism based on experimental results. This study presents an efficient method for the easy regeneration of sintered Au-based catalysts for practical applications.
Related Concept Videos
Precipitate Formation and Particle Size Control
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
Cell Size
Surface Area
Cells can take in nutrients and water via diffusion through the plasma membrane itself or through specific channels in the membrane. The area of the membrane surrounding...
Brick Sizes
Modular bricks are the most common type and are sized to include the mortar joint, which is essential for...
Genome Size and the Evolution of New Genes
Maximum Size of Aggregate
Sample Size Calculation
The sample size for the given experiment or sampling effort is fundamental to any study design. Sample size decides the number of...

