Structure and Property Investigation of Composite ZnO/SnO2Nanocrystalline Particles after High-Pressure Treatment

Composite ZnO/SnO2nanocrystalline particles (ZnO/SnO2) were synthesized by sol-gel method and with treatment of high pressure at 6 GPa. The crystallinity and the particle size of the prepared samples were analyzed by X-ray diffraction (XRD) spectroscopy. The results indicated that all the samples had the good crystallinity, and the particle size of ZnO and ZnO/SnO2decreased after high-pressure treatment. The infrared (IR) spectra showed that the distance of crystal lattice was shortened after high-pressure treatment, and the size distribution became more uneven afterSnO2doping. With the high-resolution transmission electron microscope (HRTEM), we got some morphology information and evidence to support the IR and XRD analysis results. The results of ultraviolet-visible absorption (UV-Vis) spectra showed that ZnO/SnO2might improve the photocatalytic property of the samples after high-pressure treatment.

Download Full-text

Effect of high-pressure treatment on oscillatory rheology, particle size distribution and microstructure of microalgae Chlorella vulgaris and Arthospira platensis

Algal Research ◽

10.1016/j.algal.2021.102617 ◽

2022 ◽

Vol 62 ◽

pp. 102617

Author(s):

Jasim Ahmed ◽

Vinod Kumar

Keyword(s):

Particle Size ◽

High Pressure ◽

Particle Size Distribution ◽

Size Distribution ◽

Chlorella Vulgaris ◽

Pressure Treatment ◽

High Pressure Treatment ◽

Oscillatory Rheology

Download Full-text

Controllably Introducing Exposed Surfaces to Nanocrystalline CeO2 Catalysts by High-Pressure Treatment

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.18446 ◽

2021 ◽

Vol 21 (1) ◽

pp. 693-697

Author(s):

Yunlei Zhao ◽

Hongliang Dong ◽

Zhiqiang Chen ◽

Yu Deng

Keyword(s):

High Pressure ◽

Crystal Growth ◽

Photocatalytic Property ◽

Treatment Method ◽

Model System ◽

Nanometer Scale ◽

Pressure Treatment ◽

High Pressure Treatment ◽

Highly Active ◽

Strong Size Effect

Controllably introducing highly active exposed surfaces into catalysts is a promising way to improve their properties. In addition to the widely used bottom-up method by limited crystal growth and topdown method by etching, in this study, a high-pressure treatment method is used to introduce fully crystalline clean, highly active exposed planes on submicrometer- or tens of nanometer-sized brittle catalysts. This treatment is based on a mechanism at the submicrometer or tens of nanometer scale, in which the catalysis materials are still brittle (they become ductile only when reaching the size of a couple of nanometers by the strong size effect) but do not crack randomly under high pressure like macrosized materials do. In fact, the catalyst displays a predominant cracking orientation, which is likely a highly active exposed plane, in the predominant dislocation orientation under high pressure. In this work, we used a CeO2 catalyst as a model system to show the mechanism that leads to an obvious photocatalytic property enhancement. Currently, since most catalysts have already been prepared at the submicrometer or tens of nanometer level, we believe that our findings provide a potential route to further improve their properties through a high-pressure treatment.

Download Full-text

Enhanced Ferromagnetism in Zn0.99Fe0.01O Modified by High Pressure

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.560-561.989 ◽

2012 ◽

Vol 560-561 ◽

pp. 989-993

Author(s):

Yong Qiang Wang ◽

Xue Rui Cheng ◽

Lei Su ◽

Jun Hong Hao

Keyword(s):

Particle Size ◽

High Pressure ◽

Bulk Sample ◽

Solid State Reaction Method ◽

Physical Contact ◽

Treatment Technique ◽

Pressure Treatment ◽

High Pressure Treatment ◽

Ferromagnetic Exchange ◽

Structure Morphology

Polycrystalline bulk sample Zn0.99Fe0.01O was fabricated by a solid-state reaction method and modified by high-pressure treatment technique at a pressure of 5GPa. The structure, morphology and magnetic properties of these samples were investigated in order to clarify the effect of pressure on magnetism of Zn-Fe-O system. It is found that the particle size of the modified samples becomes larger as well as the physical contact between neighboring particles becomes better. All samples show obvious ferromagnetic behaviors at room temperature, and the magnetization of modified samples greatly increases. It is believed that the larger particle size and the closer contact between neighbouring particles resulted from high-pressure treatment cause stronger ferromagnetic exchange interaction in Zn-Fe-O system.

Download Full-text

Effect of high pressure treatment on properties of acid coagulated milk gel during manufacturing ofchhana– an Indian soft cottage cheese

Food Manufacturing Efficiency ◽

10.1616/1750-2683.0041 ◽

2009 ◽

Vol 2 (3) ◽

pp. 21-30

Author(s):

Jatindra K. Sahu

Keyword(s):

High Pressure ◽

Cottage Cheese ◽

Pressure Treatment ◽

High Pressure Treatment

Download Full-text

Comparison of Ricotta cheese made by high pressure treatment with that produced by heat treatment of sweet whey

Sciences des Aliments ◽

10.3166/sda.22.601-615 ◽

2002 ◽

Vol 22 (5) ◽

pp. 601-615 ◽

Cited By ~ 5

Author(s):

Souhail Besbes ◽

Christophe Blecker ◽

Hamadi Attia ◽

Carine Massaux ◽

Claude Deroanne

Keyword(s):

Heat Treatment ◽

High Pressure ◽

Pressure Treatment ◽

High Pressure Treatment ◽

Sweet Whey

Download Full-text

Effect of food processing on the antioxidant activity of flavones from Polygonatum odoratum (Mill.) Druce

Open Life Sciences ◽

10.1515/biol-2021-0010 ◽

2021 ◽

Vol 16 (1) ◽

pp. 92-101

Author(s):

Guanghui Xia ◽

Xinhua Li ◽

Zhen Zhang ◽

Yuhang Jiang

Keyword(s):

Antioxidant Activity ◽

High Pressure ◽

Food Processing ◽

Yeast Fermentation ◽

Pressure Treatment ◽

Processing Methods ◽

High Pressure Treatment ◽

Effect Of Food ◽

The Stability

Abstract Polygonatum odoratum (Mill.) Druce (POD) is a natural plant widely used for food and medicine, thanks to its rich content of a strong antioxidant agent called homoisoflavones. However, food processing methods could affect the stability of POD flavones, resulting in changes to their antioxidant activity. This study attempts to evaluate the antioxidant activity of POD flavones subject to different processing methods and determines which method could preserve the antioxidant activity of POD flavones. Therefore, flavones were extracted from POD samples, which had been treated separately with one of the four processing methods: extrusion, baking, high-pressure treatment, and yeast fermentation. After that, the antioxidant activity of the flavones was subject to in vivo tests in zebrafish embryos. The results show that yeast fermentation had the least disruption to the antioxidant activity of POD flavones, making it the most suitable food processing method for POD. By contrast, extrusion and high-pressure treatment both slightly weakened the antioxidant activity of the flavones and should be avoided in food processing. The research results provide a reference for the development and utilization of POD and the protection of its biological activity.

Download Full-text