Alkaline-Earth Oxide Nanoparticles Obtained by Aerogel Methods. Characterization and Rational for Unexpectedly High Surface Chemical Reactivities

1997 ◽  
Vol 9 (11) ◽  
pp. 2468-2480 ◽  
Author(s):  
Olga B. Koper ◽  
Isabelle Lagadic ◽  
Alexander Volodin ◽  
Kenneth J. Klabunde
Keyword(s):  
Alkaline Earth ◽  
High Surface ◽  
Oxide Nanoparticles ◽  
Surface Chemical ◽  
Alkaline Earth Oxide

Synthesis and Characterization of Some Alkaline-Earth-Oxide Nanoparticles

2018 ◽  
Vol 72 (8) ◽  
pp. 890-899 ◽  
Author(s):  
Jitendra Pal Singh ◽  
Weon Cheol Lim ◽  
Sung Ok Won ◽  
Jonghan Song ◽  
Keun Hwa Chae
Keyword(s):  
Alkaline Earth ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles ◽  
Alkaline Earth Oxide

(Invited) Photoluminescence Properties of Alkaline-Earth Oxide Nanoparticles

2019 ◽  
Vol 28 (3) ◽  
pp. 67-80 ◽  
Author(s):  
Peter V. Sushko ◽  
Keith McKenna ◽  
D. Muñoz Ramo ◽  
A. L. Shluger ◽  
Andreas Sternig ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Oxide Nanoparticles ◽  
Photoluminescence Properties ◽  
Alkaline Earth Oxide

Alkaline earth oxide nanoparticles as destructive absorbents for environmental toxins

1999 ◽  
Vol 6 (3) ◽  
pp. 604-606 ◽  
Author(s):  
J. Moscovici ◽  
A. Michalowicz ◽  
S. Decker ◽  
I. Lagadic ◽  
K. Latreche ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Environmental Toxins ◽  
Oxide Nanoparticles ◽  
Alkaline Earth Oxide

scholarly journals Effects of Synthetic Procedures and Postsynthesis Incubation pH on Size, Shape, and Antibacterial Activity of Copper (I) Oxide Nanoparticles

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Vinh Tien Nguyen ◽  
Khanh Son Trinh
Keyword(s):  
Antibacterial Activity ◽  
High Surface ◽  
Size Variation ◽  
Reaction Rates ◽  
Bacterial Suspension ◽  
Oxide Nanoparticles ◽  
Surface Charges ◽  
Fast Reaction ◽  
Sem Images ◽  
Etching Effect

Copper (I) oxide nanoparticles (Cu2O NP) were synthesized by reducing CuSO4 with glucose in the presence of polyvinyl alcohol as a capping agent. We used three different synthetic procedures with a fast reaction (procedure 1p), a fast-then-slow reaction (procedure 2p), and a slow-then-fast reaction (procedure 3p). The reaction rates were controlled by changing the temperature and the speed of adding reagents. The synthesized Cu2O NP were subsequently incubated for 24 h in a pH 6 solution (Cu2O NP6) or a pH 8 solution (Cu2O NP8) at 5°C. XRD and SEM images analysis revealed that the 1p procedure produced smaller NP, while the 2p procedure produced larger but more uniform NP. The 3p procedure produced the largest NP with a higher size variation. The 24-hour acidic postsynthesis incubation resulted in an etching effect, which reduced the size and size variation of Cu2O NP6. To evaluate the antibacterial activity, E. coli suspensions were mixed with the obtained Cu2O NP (32, 96, or 160 ppm) for different time intervals (1 or 24 h) and then grown on Petri dishes at 37°C for 24 h. Higher doses, smaller sizes of Cu2O NP, and longer contact times with the bacterial suspension resulted in higher inactivation efficiencies. Cu2O NP6 showed higher antibacterial effects at low doses, possibly due to the etching effect and the positive surface charge. Increasing the Cu2O doses from 32 to 96 and 160 ppm noticeably increased the antibacterial effect of the Cu2O NP8, but not significantly for Cu2O NP6. We suggested that the Cu2O NP6 suffered from agglomeration at high doses due to their high surface activity and low surface charges.

scholarly journals Influence of surface chemical properties on the toxicity of engineered zinc oxide nanoparticles to embryonic zebrafish

2015 ◽  
Vol 6 ◽  
pp. 1568-1579 ◽  
Author(s):  
Zitao Zhou ◽  
Jino Son ◽  
Bryan Harper ◽  
Zheng Zhou ◽  
Stacey Harper
Keyword(s):  
Zinc Oxide ◽  
Surface Chemistry ◽  
Zinc Oxide Nanoparticles ◽  
Chemical Properties ◽  
Mortality Data ◽  
Oxide Nanoparticles ◽  
Surface Chemical ◽  
Chemical Modifications ◽  
Zno Nps ◽  
Outermost Surface

Zinc oxide nanoparticles (ZnO NPs) are widely used in a variety of products, thus understanding their health and environmental impacts is necessary to appropriately manage their risks. To keep pace with the rapid increase in products utilizing engineered ZnO NPs, rapid in silico toxicity test methods based on knowledge of comprehensive in vivo and in vitro toxic responses are beneficial in determining potential nanoparticle impacts. To achieve or enhance their desired function, chemical modifications are often performed on the NPs surface; however, the roles of these alterations play in determining the toxicity of ZnO NPs are still not well understood. As such, we investigated the toxicity of 17 diverse ZnO NPs varying in both size and surface chemistry to developing zebrafish (exposure concentrations ranging from 0.016 to 250 mg/L). Despite assessing a suite of 19 different developmental, behavioural and morphological endpoints in addition to mortality in this study, mortality was the most common endpoint observed for all of the ZnO NP types tested. ZnO NPs with surface chemical modification, regardless of the type, resulted in mortality at 24 hours post-fertilization (hpf) while uncoated particles did not induce significant mortality until 120 hpf. Using eight intrinsic chemical properties that relate to the outermost surface chemistry of the engineered ZnO nanoparticles, the highly dimensional toxicity data were converted to a 2-dimensional data set through principal component analysis (PCA). Euclidean distance was used to partition different NPs into several groups based on converted data (score) which were directly related to changes in the outermost surface chemistry. Kriging estimations were then used to develop a contour map based on mortality data as a response. This study illustrates how the intrinsic properties of NPs, including surface chemical modifications and capping agents, are useful to separate and identify ZnO NP toxicity to zebrafish (Danio rerio).

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