Erscheinungsdatum: 08/2012, Medium: Taschenbuch, Einband: Kartoniert / Broschiert, Titel: Pulsed Laser Ablation in liquid based synthesis of Nanoparticles, Titelzusatz: Synthesis and Optical properties of metal oxide nanoparticles and gold-metal oxide nanocomposites, Autor: Bajaj, Geetika, Verlag: LAP Lambert Academic Publishing, Sprache: Englisch, Rubrik: Physik // Astronomie, Sonstiges, Seiten: 252, Informationen: Paperback, Gewicht: 400 gr, Verkäufer: averdo
Nanoparticles by Continuous-wave Laser Ablation in Liquid: ab 79 € als Taschenbuch: Generation and Characterisation. Aus dem Bereich: Bücher, Wissenschaft, Technik,
Pulsed Laser Ablation in liquid based synthesis of Nanoparticles ab 78.99 € als Taschenbuch: Synthesis and Optical properties of metal oxide nanoparticles and gold-metal oxide nanocomposites. Aus dem Bereich: Bücher, Wissenschaft, Physik,
Nanoparticles by Continuous-wave Laser Ablation in Liquid: ab 79 EURO Generation and Characterisation
Laser ablation in liquid is becoming an important technique for the generation of nanoparticles (NPs). Until now only pulsed lasers have been used, this is a pioneer work, using high-power, high-brightness continuous-wave (CW) fibre laser ablation in liquid, for the generation of NPs. A mechanism is proposed based on experimental observations, including high-speed imaging and emission spectroscopic analysis of the ablated plume. Three different target materials (Titanium, Nickel and Alpha-aluminium-oxide), submerged in either water or sodium dodecyl sulphate (SDS) solution at various concentrations were used. The characterisation of the generated metal-oxide NPs, in terms of size, size-distribution, shape, chemical composition and phase structure was carried out by UV-Vis photo-spectroscopy, transmission electron microscopy (TEM), high-resolution TEM with energy-dispersive X-rays spectroscopy and X-ray diffraction. This study paves a route towards a new application of CW fibre lasers. The book is useful to engineering students, professional engineers, researchers, academicians and scientists in materials, NPs characterisation, mechanical, laser processing and related disciplines.
Ferromagnetic shape-memory (FSM) compounds are actively studied materials due to their large shape changes in an external magnetic field. This makes it possible to realize novel actuators and sensors. For the fabrication of micromechanical components and even microscopic machines, the material should be in thin-film form, and pulsed laser deposition (PLD) is an effective technique to reach this goal. In this thesis, FSM Ni-Mn-Ga films with a thickness of a few hundred nanometers were deposited on different substrates and methods were developed to release the film from its substrate. For efficient ablation, the intensity distribution of the laser beam on the target should be smooth with steep edges. In this work, such a distribution was realized with the help of diffractive optics. Diffractive optics was also applied to directly produce almost propagation-invariant laser beams, so-called Bessel-Gauss beams in laser resonators. Furthermore, Bessel-like laser beams were created as a result of self-focusing in a certain liquid crystal. Such diffraction-free laser beams can be used in precise laser ablation and accurate patterning of small structures in thin films.
The pulsed laser ablation in liquid media (PLAL) is a rapidly emerging technique in material science for fabricating metal and metal-oxide nanoparticles. The advantage of this method over the conventional chemical methods is the lower cost, high purity and absence of defects in the formed nanoparticles (NPs). The technique requires the minimum amount of chemical species for synthesis compared to the conventional chemical process and provides greater flexibility in controlling the properties of NPs by suitable choice of laser parameters and liquid medium. This work discuss effect of various laser parameters, surrounding liquid and surfactants on synthesized metal oxide nanostructures. Different approaches to extend PLAL technique to multicomponent material fabrication has been discussed. These multicomponent nanocomposites exhibit modified optical properties, enhanced stability and functionalities.
Graphene is an attractive alternative material for diverse applications in electronic devices, fuel cells, biomedical sensors, energy storage, and super-capacitors due to its exceptional thermal,electrical, optical and mechanical properties. This material can be synthesized by many effective methods such as chemical vapor deposition,and micromechanical exfoliation of graphite. This book investigates a novel and clean approach to grow graphene directly from bulk graphite by Pulsed Laser Ablation in Liquid. This technique is simple, and fast,a one-step procedure to fabricate pure and stable graphene nanoparticles by short ablation time. It results in controllable-size products, high mass production, high stability, less aggregation, and absence of chemical agents,a known disadvantages observed in other approaches for graphene production. Confirming the presence of graphene is carried out by several characterization techniques including Raman spectroscopy, UV-VISIBLE, AFM, SEM,and TEM. These techniques allow an insight into the morphological and structural properties of the produced graphene. The potential recipe for growing high quality graphene is intensively explained in this book.
The organic compounds that emit at different wavelength regions have been selected to study. Fluorescent dyes play an important role for staining and sensoring in analytical chemistry, environmental science, biology and medicine. Some fluorescent dyes are laser active and are used in dye lasers. In recent years the research interests changed from liquid dye lasers to solid state dye lasers.Often organic polymers are used as solid matrices for organic dyes. Semiconducting (conjugated) polymers have properties that make them attractive as the gain material for solid state lasers. Dye lasers utilizing a solid host are very attractive for a wide range of applications. For example, in medicine can use in cardiology for ablation of blood clots, photodynamic therapy for photo-radiation and bio-stimulation, biological field DNA detection and sequencing, remote sensing of atmospheric contaminants, underwater communications, holography, optoelectronic applications.