Mechanochemical effects of ZnO powder in a wet super-fine grinding system as indicated by instrumental characterization

Du, Guotong; Xue, Qiang; Ding, Hao; Li, Zhaohui

doi:10.1016/j.minpro.2015.06.008

Cited by 16 publications

(4 citation statements)

References 25 publications

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“…Obviously, for particles ground in water or in a CH 3 COOH solution, the intensities of diffraction peaks are lower, and the lines of diffraction peaks are broader, especially for the particles ground in the CH 3 COOH solution. This indicates that the breakage of particles during grinding increases the surface-defect density and creates more hot spots for the particle surfaces’ dissolution [ 30 , 33 ]. The breakage of particles and chemical dissolution on the particles’ surfaces lead to the size reduction and morphology change, and hence, the particles’ surface dissolution in grinding due to the mechanochemical effect could affect the particle size, PSD and sphericity.…”

Section: Resultsmentioning

confidence: 99%

Chemical Dissolution-Assisted Ultrafine Grinding for Preparation of Quasi-Spherical Colloids of Zinc Oxide

et al. 2023

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Submicron-sized quasi-spherical zinc oxide (ZnO) particles were prepared by wet ultrafine grinding in a stirred media mill under various conditions. The effects of parameters (i.e., solution type, acid or alkali concentration, solid content and grinding time) on the particle median size (d50), particle size distribution (PSD) and sphericity of ZnO particles was investigated. The results show that submicron-sized quasi-spherical particles (i.e., d50: 370 nm, uniformity coefficient (n) of 2.28 and sphericity of 0.91) can be obtained when the micron-sized ZnO particles are ground for 30 min in a CH3COOH solution at a concentration of 0.010 mol/L with 20 wt.% of solid content. The chemical dissolution of ZnO particles ground in the presence and absence of acetic acid is discussed. It is indicated that chemical dissolution accelerated due to the mechanochemical effects could reduce the particle size, obtain a narrower PSD and enhance the sphericity. In addition, the functions of selection and breakage were used to analyze the grinding mechanism of ZnO particles.

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Section: Resultsmentioning

confidence: 99%

Chemical Dissolution-Assisted Ultrafine Grinding for Preparation of Quasi-Spherical Colloids of Zinc Oxide

et al. 2023

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“…The weak absorption peak at 3442.1 cm –1 could be attributed to stretching vibration of associating hydroxyls formed by weak hydrogen bonding as well as van der Waals interaction ( 37 ). The stretching vibration band at 571.1 cm –1 corresponding to the Zn-O bond ( 38 ). Compared with ZnONPs, KH550-ZnONPs displayed a new typical characteristic absorption peak of -NH 2 at 1582.6 cm –1 , which was attributed to the characteristic absorption peak of KH550.…”

Section: Resultsmentioning

confidence: 99%

Polysaccharide from Atractylodes macrocephala Koidz binding with zinc oxide nanoparticles: Characterization, immunological effect and mechanism

Liu

Wang

et al. 2022

Front. Nutr.

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Atractylodes macrocephala Koidz (A. macrocephala) has been used both as a traditional medicine and functional food for hundreds of years in Asia. And it has a variety of biological activities, such as enhancing the ability of immunity and modulating effect on gastrointestinal motility. In this study, a watersoluble polysaccharide with molecular weight of 2.743 × 10 3 Da was isolated from the root of A. macrocephala. Polysaccharide from A. macrocephala (AMP) consisted of arabinose, galactose, glucose, xylose, mannose, ribose, galactose uronic acid, glucose uronic acid, with a percentage ratio of 21.86, 12.28, 34.19, 0.43, 0.92, 0.85, 28.79, and 0.67%, respectively. Zinc plays an important role in immune system. Therefore, we supposed that AMP binding with zinc oxide (ZnO) nanoparticles (AMP-ZnONPs) might be an effective immunostimulator. AMP-ZnONPs was prepared by Borch reduction, and its structural features were characterized by Scanning Electron Microscope (SEM), Transmission electron microscope (TEM), TEM-energy dispersive spectroscopy mapping (TEM-EDS mapping), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectrometer (XPS), X-ray diffraction (XRD), particle size and zeta-potential distribution analysis. Then, its immunostimulatory activity and the underlying mechanism were evaluated using RAW264.7 cells. The results showed that AMP-ZnONPs remarkably promoted cell proliferation, enhanced phagocytosis, the release of nitric oxide (NO), cytokines (IL-6 and IL-1β) and the expression of co-stimulatory molecules (CD80, CD86 and MHCII). Moreover, AMP-ZnONPs could promote Frontiers in Nutrition 01 frontiersin.org Bo et al. 10.3389/fnut.2022.992502the expression of Toll-like receptor 4 (TLR4), Myeloid differentiation factor 88 (MyD88), TNF receptor associated factor 6 (TRAF6), phospho-IκBα (P-IκBα) and phospho-p65 (P-p65), and TLR4 inhibitor (TAK242) inhibited the expression of these proteins induced by AMP-ZnONPs. Therefore, AMP-ZnONPs activated macrophages by TLR4/MyD88/NF-κB signaling pathway, indicating that AMP-ZnONPs could act as a potential immunostimulator in medicine and functional food. KEYWORDSpolysaccharide from Atractylodes macrocephala Koidz, zinc oxide nanoparticles, immunostimulatory activity, TLR4 signaling pathways, potential immunostimulator Materials and methods Reagents and materialsA. macrocephala was purchased from the Tongrentang Company in Beijing. The plant material was identified by Prof. Jingui Li. The purified AMP was prepared in our laboratory and the polysaccharide content was 96% (UV). RAW264.7 cells were obtained from American Type Culture Collection (ATCC,

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“…The process of mechanochemistry is divided into three consecutive stages: stress stage, aggregation stage and agglomeration stage. 51,52 During the process of WG, the starch granules would be subjected to a series of mechanical forces such as high-speed shear, strong impact, and high-frequency oscillation. At 7.5 min, the irregular small bulges appeared on the surface of some starch granules (Fig.…”

Section: Pasting Propertiesmentioning

confidence: 99%

Exploring the influence mechanism of water grinding on the gel properties of corn starch based on changes in its structure and properties

et al. 2023

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BACKGROUND: At present, most studies have focused on the preparation of modified starches by dry grinding. As an excellent starch plasticizer, water might enhance the action of grinding on the structure of starch granules, and water grinding might improve the gel properties of starch. Therefore, this article explored the influence mechanism of water grinding on the gel properties of corn starch based on the changes in its structure and properties. RESULTS:The results showed that water grinding could make water enter the starch granules and hydrate the starch molecules, and the starch gelatinized after water grinding for 20 min. Thus, water enhanced the action of grinding on the structure of the starch granules. Under the plasticization and grinding action of water grinding, the mechanochemical effect of the starch granules occurred. When the starch was in the aggregation stage (7.5-10 min), the crystallinity of the starch increased, and the starch molecules rearranged into a more stable structure, which increased apparent viscosity (η), elastic modulus (G 0 ) and viscous modulus (G 00 ) of the starch gels. CONCLUSION: Therefore, appropriate water grinding (10 min) contributed to increasing the viscoelasticity of starch gels. This study provided a theoretical foundation for research on improving the properties of starch by mechanical modification in future.

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Mechanochemical effects of ZnO powder in a wet super-fine grinding system as indicated by instrumental characterization

Cited by 16 publications

References 25 publications

Chemical Dissolution-Assisted Ultrafine Grinding for Preparation of Quasi-Spherical Colloids of Zinc Oxide

Chemical Dissolution-Assisted Ultrafine Grinding for Preparation of Quasi-Spherical Colloids of Zinc Oxide

Polysaccharide from Atractylodes macrocephala Koidz binding with zinc oxide nanoparticles: Characterization, immunological effect and mechanism

Exploring the influence mechanism of water grinding on the gel properties of corn starch based on changes in its structure and properties

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