scholarly journals The shape and speciation of Ag nanoparticles drive their impacts on organisms in a lotic ecosystem

2020 ◽  
Vol 7 (10) ◽  
pp. 3167-3177
Author(s):  
M. Auffan ◽  
C. Santaella ◽  
L. Brousset ◽  
M. Tella ◽  
E. Morel ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Silver Nanomaterials ◽  
Lotic Ecosystem ◽  
Different Shapes

Silver nanomaterials with different shapes (spheres, plates, wires, rods, cubes) are valued by industries and scientists for their shape-dependent properties which make them useful for diverse applications.

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

Hydrothermal preparation of TiO2-Ag nanoparticles and its antimicrobial performance against human pathogenic microbial cells in water

BIOCELL ◽  
2018 ◽  
Vol 42 (3) ◽  
pp. 93-97 ◽  
Author(s):  
Mahmoud MOUSTAFA ◽  
Saad ALAMRI ◽  
Mohamed ELNOUBY ◽  
Tarek TAHA ◽  
M. A. ABU-SAIED ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Hydrothermal Preparation ◽  
Microbial Cells ◽  
Antimicrobial Performance

A Biological Approach of Silver (Ag) Nanoparticles Synthesis Using Leaf Extract of Adhatoda Vasica

2012 ◽  
Vol 3 (2) ◽  
pp. 177-179
Author(s):  
Dr. K.Vinoth Kumar Dr. K.Vinoth Kumar ◽  
◽  
Dr. C. Udayasoorian Dr. C. Udayasoorian
Keyword(s):  
Ag Nanoparticles ◽  
Leaf Extract ◽  
Adhatoda Vasica ◽  
Biological Approach ◽  
Nanoparticles Synthesis

Elucidating the Weakly Reversible Cs-Pb-Br Perovskite Nanocrystal Reaction Network with High-Throughput Maps and Transformations

2020 ◽  
Author(s):  
Jakob Dahl ◽  
Xingzhi Wang ◽  
Xiao Huang ◽  
Emory Chan ◽  
Paul Alivisatos
Keyword(s):  
High Throughput ◽  
Dynamic Equilibrium ◽  
Reaction Network ◽  
Substantial Impact ◽  
Equilibrium Behavior ◽  
Automated Method ◽  
Lead Bromide ◽  
Different Shapes ◽  
Complex Chemistry ◽  
Lead Halide

<p>Advances in automation and data analytics can aid exploration of the complex chemistry of nanoparticles. Lead halide perovskite colloidal nanocrystals provide an interesting proving ground: there are reports of many different phases and transformations, which has made it hard to form a coherent conceptual framework for their controlled formation through traditional methods. In this work, we systematically explore the portion of Cs-Pb-Br synthesis space in which many optically distinguishable species are formed using high-throughput robotic synthesis to understand their formation reactions. We deploy an automated method that allows us to determine the relative amount of absorbance that can be attributed to each species in order to create maps of the synthetic space. These in turn facilitate improved understanding of the interplay between kinetic and thermodynamic factors that underlie which combination of species are likely to be prevalent under a given set of conditions. Based on these maps, we test potential transformation routes between perovskite nanocrystals of different shapes and phases. We find that shape is determined kinetically, but many reactions between different phases show equilibrium behavior. We demonstrate a dynamic equilibrium between complexes, monolayers and nanocrystals of lead bromide, with substantial impact on the reaction outcomes. This allows us to construct a chemical reaction network that qualitatively explains our results as well as previous reports and can serve as a guide for those seeking to prepare a particular composition and shape. </p>

NEW TiO2-Ag NANOPARTICLES USED FOR ORGANIC COMPOUNDS DEGRADATION

2019 ◽  
Vol 18 (8) ◽  
pp. 1755-1763 ◽  
Author(s):  
Maria Harja ◽  
Igor Cretescu ◽  
Consuelo Gomez de Castro ◽  
Catalina Nutescu Duduman ◽  
Doina Lutic ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Ag Nanoparticles
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