scholarly journals Analysis of Acoustic Signals During the Optical Breakdown of Aqueous Solutions of Fe Nanoparticles

2020 ◽  
Vol 8 ◽  
Author(s):  
Ilya V. Baimler ◽  
Andrey B. Lisitsyn ◽  
Dmitriy A. Serov ◽  
Maxim E. Astashev ◽  
Sergey V. Gudkov
Keyword(s):  
Distinctive Feature ◽  
Iron Nanoparticles ◽  
Optical Breakdown ◽  
Acoustic Signals ◽  
Time Interval ◽  
Gas Bubble ◽  
Characteristic Form ◽  
Colloidal Solutions ◽  
Acoustic Spectrum ◽  
Fe Nanoparticles

The study investigates the spectra of acoustic signals generating during the optical breakdown of colloidal solutions of iron nanoparticles. A characteristic form of the acoustic spectrum has been experimentally established, a distinctive feature of which is the presence of signals from an expanding and collapsing gas bubble. It is shown that the amplitude and area of these acoustic signals depend on the concentration of nanoparticles in the irradiated colloid. The effect of the concentration of nanoparticles on the bubble lifetime corresponding to the time interval between the acoustic spectrum signals corresponding to the birth and cavitation of a gas bubble has been studied.

scholarly journals Influence of Gases Dissolved in Water on the Process of Optical Breakdown of Aqueous Solutions of Cu Nanoparticles

2020 ◽  
Vol 8 ◽  
Author(s):  
Ilya V. Baimler ◽  
Andrey B. Lisitsyn ◽  
Sergey V. Gudkov
Keyword(s):  
Molecular Hydrogen ◽  
Colloidal Solution ◽  
Control Sample ◽  
Optical Breakdown ◽  
Acoustic Signals ◽  
Atmospheric Gases ◽  
Colloidal Solutions ◽  
Laser Breakdown ◽  
Integral Luminosity ◽  
Effect Of Gases

The paper investigates the effect of gases dissolved in water on the processes occurring during the laser breakdown of colloidal solutions of nanoparticles. The dynamics of the dependences of the plasma luminosity and acoustic signals on the concentration of nanoparticles under irradiation of colloids of nanoparticles saturated with air, argon, and molecular hydrogen has been studied. It is shown that irradiation of colloids saturated with molecular hydrogen and argon leads to an increase in the integral luminosity and integral acoustic signals in comparison with the control sample saturated with atmospheric gases, which indicates the obvious presence of the influence of gases dissolved in the liquid on the optical breakdown process. The most intense acoustic signals, as well as the brightest breakdowns, were observed when the colloidal solution was saturated with molecular hydrogen.

In situ magnetic and electronic investigation of the early stage oxidation of Fe nanoparticles using X-ray photo-emission electron microscopy

2014 ◽  
Vol 16 (48) ◽  
pp. 26624-26630 ◽  
Author(s):  
C. A. F. Vaz ◽  
A. Balan ◽  
F. Nolting ◽  
A. Kleibert
Keyword(s):  
Electron Microscopy ◽  
Chemical Composition ◽  
Iron Nanoparticles ◽  
Early Stage ◽  
Photoemission Electron Microscopy ◽  
X Ray ◽  
Emission Electron ◽  
Fe Nanoparticles ◽  
Photoemission Electron

In situX-ray photoemission electron microscopy reveals the evolution of chemical composition and magnetism of individual iron nanoparticles during oxidation.

Experimental Investigation on Underwater Opto-Acoustic Communication

2011 ◽  
Vol 143-144 ◽  
pp. 653-657
Author(s):  
Tao Liu ◽  
Jian Gan Wang ◽  
Si Guang Zong
Keyword(s):  
Acoustic Communication ◽  
Acoustic Pressure ◽  
Optical Breakdown ◽  
Laser Pulses ◽  
Acoustic Signals ◽  
High Energy ◽  
Acoustic Energy ◽  
Underwater Sound ◽  
Energy Laser ◽  
High Energy Laser

The underwater opto-acoustic communication system for directional acoustic communication between an in-air platform and a submerged platform operating is important. The paper presents a new method to solve this problem with opto-acoustic technology, which combines high-energy laser, the opto-acoustic transmitter that optical energy is converted to acoustic energy at the water surface. The laser-based transmitter provides a versatile method for generating underwater sound. The acoustic pressure is linearly proportional to the laser power. The paper designed an experimental measurement system for the opto-acoustic communication. It made experiments for study on the waveform and spectrum characteristics of opto-acoustic signals. The paper also discuss the acoustic wave after optical breakdown in water with Nd:YAG laser pulses. The opto-acoustic signals can controll by adjusting the laser's parameters. The conclusion is that the opto-acoustic communication has some technical advantages. This system presents a change in the way communicational from the air.

Synergistic effects in Fe nanoparticles doped with ppm levels of (Pd + Ni). A new catalyst for sustainable nitro group reductions

2018 ◽  
Vol 20 (1) ◽  
pp. 130-135 ◽  
Author(s):  
Haobo Pang ◽  
Fabrice Gallou ◽  
Hyuntae Sohn ◽  
Jeffrey Camacho-Bunquin ◽  
Massimiliano Delferro ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Nitro Group ◽  
Iron Nanoparticles ◽  
Synergistic Effects ◽  
Fe Nanoparticles

A synergistic effect has been uncovered between ppm levels of Pd and Ni embedded within iron nanoparticles that leads to selective catalytic reductions of nitro-containing aromatics in water.

Investigation of the laser-induced breakdown plasma, acoustic vibrations and dissociation processes of water molecules caused by laser breakdown of colloidal solutions containing Ni nanoparticles

2021 ◽  
Author(s):  
Ilya Baymler ◽  
Alexander Vladimirovich Simakin ◽  
Sergey Vladimirovich Gudkov
Keyword(s):  
Irradiation Time ◽  
Average Distance ◽  
Optical Breakdown ◽  
Maximum Pressure ◽  
Ni Nanoparticles ◽  
Nanoparticle Concentration ◽  
Colloidal Solutions ◽  
Nanosecond Pulses ◽  
Laser Breakdown ◽  
Laser Induced Breakdown

Abstract In this work the process of optical breakdown under laser irradiation by nanosecond pulses with an energy of 650 mJ of aqueous solutions of Ni nanoparticles is investigated. A monotonic change in the number of breakdowns, the average distance between closest breakdowns, the average plasma size of an individual breakdown, the luminosity of a plasma flash, the intensity of acoustic signals, and the rate of formation of dissociation products - O2, H2, OH•, and H2O2 with an increase in the irradiation time was established. With an increase in the concentration of nanoparticles, the measured values change non-monotonically. The maximum luminosity of a plasma flash is observed at a nanoparticle concentration of 109 NP/ml and 1010 NP/ml and reaches 350 cd/m2. The maximum pressure at the shock front is 1.5–2 MPa at a nanoparticle concentration of 1010 NP/ml. The maximum rates of generation of O2, H2, OH• and H2O2 are observed at concentrations of 109 NP/ml and 1010 NP/ml. Correlation analysis of the studied physicochemical phenomena shows that the formation of molecular gases is associated with acoustic processes, and the formation of radical products and hydrogen peroxide correlates with the physicochemical properties of plasma.

Alkyl phosphonic acid-based ligands as tools for converting hydrophobic iron nanoparticles into water soluble iron–iron oxide core–shell nanoparticles

2017 ◽  
Vol 41 (20) ◽  
pp. 11898-11905 ◽  
Author(s):  
Kais Gharbi ◽  
Florent Salles ◽  
Paul Mathieu ◽  
Catherine Amiens ◽  
Vincent Collière ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Phosphonic Acid ◽  
Iron Nanoparticles ◽  
Water Soluble ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Fe Nanoparticles ◽  
Iron Iron ◽  
Iron Oxide Core ◽  
Core Shell Nanoparticles

Transfer of Fe nanoparticles into water using phosphonates.

Toxicity of Fe0 Nanoparticles on the Denitrifying Bacteria-Alcaligenes Eutrophus

2011 ◽  
Vol 343-344 ◽  
pp. 889-894
Author(s):  
Mei Ying Dong ◽  
Xue Wang ◽  
Fang Huang ◽  
Zhao Hui Jin ◽  
Tie Long Li
Keyword(s):  
Sodium Oleate ◽  
Surface Coating ◽  
Iron Nanoparticles ◽  
Bimetallic Nanoparticles ◽  
Alcaligenes Eutrophus ◽  
Denitrifying Bacteria ◽  
Nitrification Inhibition ◽  
Inhibition Rate ◽  
Fe Nanoparticles ◽  
Metal Materials

The bio-toxicity of Fe0 nanoparticles on the denitrifying bacterial- Alcaligenes eutrophus was detected by the two methods of detecting inhibition of the growth of microorganisms and nitrification inhibition rate. The results showed that Fe0 nanoparticles had obvious toxicity on the growth and nitrification inhibition rate. Besides, there had distinct relationship between dose and toxicity of Fe0 nanoparticles. Meanwhile, we also studied effects of different kinds of Fe0 nanoparticles on microorganism, including bimetallic nanoparticles(nano Fe–Ni) and coated iron nanoparticles (sodium oleate–Fe0nanoparticles). We detected that the bio-toxicity of these three Fe0 nanoparticles followed the sequence of Ni-containing nanoparticles>unmodified NZVI>the sodium oleate–Fe0 nanoparticles. In conclusion, Fe0 nanoparticles had visible toxicity on the denitrifying bacterial, but we can decrease the toxicity of Fe nanoparticles by surface coating and decoration of nano-metal materials.

scholarly journals Aqueous stabilisation of carbon-encapsulated superparamagnetic α-iron nanoparticles for biomedical applications

2014 ◽  
Vol 43 (36) ◽  
pp. 13764-13775 ◽  
Author(s):  
Noemí Aguiló-Aguayo ◽  
Lionel Maurizi ◽  
Sandra Galmarini ◽  
Marie Gabrielle Ollivier-Beuzelin ◽  
Géraldine Coullerez ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Iron Nanoparticles ◽  
Aqueous Media ◽  
Fe Nanoparticles

Carbon-encapsulated superparamagnetic α-Fe nanoparticles were stabilised in aqueous media allowing their cell internalisation.

scholarly journals Preparation of carbon nanofibrous mats encapsulating zero-valent Fe nanoparticles as Fe reservoir for removal of organic pollutants

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 4883-4889
Author(s):  
Hao Jiang ◽  
Yaomin Li ◽  
Zhengnan Su ◽  
Tiantian Zhang ◽  
Lihui Meng ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Organic Pollutants ◽  
Environmental Remediation ◽  
Iron Nanoparticles ◽  
Zero Valent Iron ◽  
Fe Nanoparticles ◽  
Zero Valent Iron Nanoparticles

Zero-valent iron nanoparticles (ZVI NPs) encapsulated in single-axial and co-axial carbon nanofibers can be used for environmental remediation at different situations.

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