Effects on human skin:
1. Nanogold particles activate fibrous cells, which can awaken sleeping cells, strengthen the tightness between collagen and fibers, repair scars, smooth wrinkles, tighten skin, improve cell activity, resist oxidation and aging, and make skin spontaneously contract rhythmically.
2. By massaging the nano-gold particles, they can fully penetrate into the dermal layer of the skin, double the water-holding capacity of the skin, and produce more collagen to fight free radicals, thus preventing skin aging, reducing facial fine lines, making the skin full, firm and elastic, and activating the whole skin from cells.
3. Nano-gold spheres have catalytic activity, which can quickly and thoroughly penetrate into dermal reticular layer, form elastic omentum, closely connect, repair fragile damaged cells, activate fibroblasts, improve skin elasticity and tension, closely combine elastic fibers and collagen fibers, smooth wrinkles, tighten skin, achieve antioxidant and antibacterial effects, alleviate various skin problems, and deeply regulate problems caused by sebum lesions.
Extended data
Researchers in China have made great progress in the study of nano-gold catalysis.
Supported by the National Natural Science Foundation of China (project numbers: 2 1590792, 9 1645203, 2 152 109 1), the Li Juan Research Group of Tsinghua University Department of Chemistry and Wang Chongmin Research Group of Northwest Pacific National Laboratory and Pittsburgh, USA.
The research results were published in PNAS (Proceedings of the National Academy of America) on July 9, 20 18, and the topic was the size effect and dynamic structural changes of carbon monoxide oxidation catalyzed by gold nanoparticles.
Since the discovery of nano-sized (2 ~ 5 nm) gold particles with low-temperature catalytic activity in the late 1980s, nano-gold catalysis has become one of the milestones in the field of heterogeneous catalysis. For more than 30 years, nano-sized supported gold catalysts have been widely studied in experiment and theory, but its remarkable "size effect" is still a mystery.
On the basis of many years' research on the catalysis of gold clusters and their nanoparticles, Li Juan's research group found that there were dynamic monoatomics generated under reaction conditions during the catalysis of gold nanoparticles, and therefore put forward the concept of "dynamic monoatomic catalysis".
In order to reveal the essence of dynamic monoatomic catalysis, the dynamic mechanism of reaction molecules and gold nanoparticles in carbon monoxide oxidation reaction was revealed for the first time by using environmental electron transmission microscope and computational chemical simulation. It is found that the large gold particles (>: 4 nm) only undergo surface reconstruction when interacting with carbon monoxide molecules, and the overall structure of the particles is not destroyed. However, when smaller gold particles (~ ~2 nm) interact with carbon monoxide molecules, the overall structure of gold particles is destroyed and becomes amorphous dynamic structure.
The calculation and simulation show that for smaller gold particles, the gold atoms with carbon monoxide adsorbed on the surface can continuously transport the reaction molecules to the interface between the carrier and the gold particles, thus reacting with the oxygen molecules adsorbed on the interface, which greatly speeds up the reaction. Therefore, the size effect of gold catalysis can be explained by whether gold nanoparticles can generate dynamic monoatomic gold under reaction conditions.
The above findings improve people's understanding of the size effect of traditional nano-gold catalysts. The dynamic monoatomic catalytic reaction model proposed in this study can explain more metal nano-catalysis, which has important guiding significance for the study of dynamic reaction mechanism of nano-catalysts.
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National Natural Science Foundation of China-China researchers have made progress in the study of size effect catalyzed by nano-gold.