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Search for "ablation" in Full Text gives 104 result(s) in Beilstein Journal of Nanotechnology.
Properties of plasmonic arrays produced by pulsed-laser nanostructuring of thin Au films
Beilstein J. Nanotechnol. 2014, 5, 2102–2112, doi:10.3762/bjnano.5.219
- mechanisms and final effect. Mechanisms relevant to the laser nanostructuring (LNS) of thin metal films are often discussed in the broader context of the non-equilibrium processes due to pulsed-laser interaction at time scales from micro- to femto-seconds and with nanofabrication by material ablation and
Carbon-based smart nanomaterials in biomedicine and neuroengineering
Beilstein J. Nanotechnol. 2014, 5, 1849–1863, doi:10.3762/bjnano.5.196
- size of the nanomaterial itself [87][88][89], as well as on the presence of metal contaminants and the residues of the GO preparation method in graphene samples [90]. Biomedical applications of graphene and its derivatives range from photothermal tumour ablation therapy to biosensors, from gene therapy
Current state of laser synthesis of metal and alloy nanoparticles as ligand-free reference materials for nano-toxicological assays
Beilstein J. Nanotechnol. 2014, 5, 1523–1541, doi:10.3762/bjnano.5.165
- toxicological studies. Nanoparticles synthesized by pulsed laser ablation in liquid are a promising alternative as this synthesis route provides totally ligand-free nanoparticles. The first part of this article reviews recent methods that allow the size control of laser-fabricated nanoparticles, focusing on
- paragraph of this article highlights the recent progress concerning the synthesis of composition controlled alloy nanoparticles by laser ablation in liquids. Here, binary and ternary alloy nanoparticles with totally homogeneous elemental distribution could be fabricated and the composition of these
- , mammalian cells and bacteria are considered. Keywords: albumin; gold-silver; implant alloy; laser ablation; nickel-titanium; size control; wear debris; Introduction The widespread use of medical implants consisting of metals (e.g., gold coatings [1]) and alloys (e.g., NiTi, CoCr, stainless steel) [2][3][4
In vitro interaction of colloidal nanoparticles with mammalian cells: What have we learned thus far?
Beilstein J. Nanotechnol. 2014, 5, 1477–1490, doi:10.3762/bjnano.5.161
- corona [93][94]. The protein corona has a significant impact on how NPs interact with cells and thus will be discussed in the following in more detail. NPs can, in principle, be synthesized in water without any organic surface coating, for example by laser ablation [129][130][131]. However, also to NPs
Protein-coated pH-responsive gold nanoparticles: Microwave-assisted synthesis and surface charge-dependent anticancer activity
Beilstein J. Nanotechnol. 2014, 5, 1452–1462, doi:10.3762/bjnano.5.158
- lower costs and minimal side effects [24]. Because of their biocompatibility, noble metal nanoparticles, particularly AuNPs, are more preferable in various biomedical applications, including highly sensitive diagnostic assays [25], thermal ablation, radiotherapy enhancement [26][27][28], as well as for
The cell-type specific uptake of polymer-coated or micelle-embedded QDs and SPIOs does not provoke an acute pro-inflammatory response in the liver
Beilstein J. Nanotechnol. 2014, 5, 1432–1440, doi:10.3762/bjnano.5.155
- demonstrating effective ablation of Kupffer cells in our system (Figure 6A). Furthermore, consecutive injections of pure lipid micelles or micelles containing either QDs or SPIOs in the presence or absence of Kupffer cells had no acute influence on TNFα or Cxcl10 expression (Figure 6B, C) indicating that heavy
- biopsies were taken and processed for transmission electron microscopy (TEM) as described [18][20]. Micrographs were obtained with a FEI Eagle 4k CCD camera and a Technai 20 TEM operated at 200 kV. Clodronate-mediated ablation of Kupffer cells Procedure was performed as described recently [35]. Briefly
- uptake into hepatocytes is dependent on apolipoprotein E. Impact of QDs– and SPIOs–lipid micelles on hepatic gene expression after ablation of Kupffer cells. Wild type und clodronate-treated BALB/c wild type mice were intravenously injected with PBS (control), lipid micelles, SPIOs-micelles and QDs
Dry friction of microstructured polymer surfaces inspired by snake skin
Beilstein J. Nanotechnol. 2014, 5, 1091–1103, doi:10.3762/bjnano.5.122
- originated from moulds of polishing paper (FibrMet Discs, Buehler GmbH, Düsseldorf, Germany) with different grain sizes (Ra: 0.3 µm, 1 µm, 3 µm, 9 µm, and 12 µm) (Figure 3b). The master for the third type of surfaces was produced from zirconium oxide surface microstructured by femtosecond laser ablation
Injection of ligand-free gold and silver nanoparticles into murine embryos does not impact pre-implantation development
Beilstein J. Nanotechnol. 2014, 5, 677–688, doi:10.3762/bjnano.5.80
- to the cytotoxicity of silver ions [42]. In order to exclude any cross-effects of stabilizers or reducing agents, which are difficult to exclude in precursor-based chemically produced gold and silver nanoparticles, the particles for this study were synthesized by laser ablation of a bulk solid target
- can unfold toxic properties of their own [78]. The studies performed on avian embryos and the experiments presented here employed particles synthesized by physical means, an electric non-explosive method and laser ablation in water, respectively. Those methods produce colloids completely free of any
- to nanoparticles consists in the ablation of a target in liquid media by intense laser radiation, leading to an ejection of its constituent and the formation of a colloidal nanoparticle solution (Figure 1A), released into pure water after the collapse of the laser-induced cavitation bubble [45][79
Energy dissipation in multifrequency atomic force microscopy
Beilstein J. Nanotechnol. 2014, 5, 494–500, doi:10.3762/bjnano.5.57
- action. Moreover, the techniques outlined in this work will find applications in a variety of fields of interest for nanotechnology. Few-cycle AFM will be useful to characterize the mechanical contact properties of nanostructures produced by femtosecond laser ablation [22], while wavelets techniques will
A catechol biosensor based on electrospun carbon nanofibers
Beilstein J. Nanotechnol. 2014, 5, 346–354, doi:10.3762/bjnano.5.39
- development, various methods used for CNFs preparation are established, such as arc-discharge [21], laser ablation [22], chemical vapor deposition (CVD) methods [23]. Electrospinning, which is known as a facile and convenient process, can produce nanofibers or microfibers with different diameters while using
Optical near-fields & nearfield optics
Beilstein J. Nanotechnol. 2014, 5, 186–187, doi:10.3762/bjnano.5.19
- of both the nanostructure itself by local melting and the substrate by ablation at the positions of the hot spots may be used. The interaction of plasmonic structures with their surroundings can be employed to tune their optical properties, e.g., by using a dielectric phase change material like
Synthesis of boron nitride nanotubes from unprocessed colemanite
Beilstein J. Nanotechnol. 2013, 4, 843–851, doi:10.3762/bjnano.4.95
- BNNTs are more toxic than CNTs [13]. The first BNNTs were synthesized by Chopra et al. with the arc-discharge method [14]. Later, the use of chemical vapor deposition (CVD), laser ablation, ball milling, a template-assisted process, and displacement reactions were reported for the synthesis [15][16][17
- with the use of a laser-ablation technique [22]. As can be concluded from these studies, CVD is a commonly used technique to synthesize BNNTs. The BNNT synthesis and growth mechanism depend on the reaction parameters such as substrate, catalyst and temperature but the mechanism has not been elucidated
Mapping of plasmonic resonances in nanotriangles
Beilstein J. Nanotechnol. 2013, 4, 588–602, doi:10.3762/bjnano.4.66
- these structures with short laser pulses and imaging the resulting ablation and melting patterns. The triangular gold structures were prepared on Si substrates and had a thickness of 40 nm and a side length of ca. 500 nm. Irradiation was carried out with single femtosecond and picosecond laser pulses at
- a wavelength of 800 nm, which excited higher order plasmon modes in these triangles. The ablation distribution as well as the local melting of small parts of the nanostructures reflect the regions of large near-field enhancement. The observed patterns are reproduced in great detail by FDTD
- for the field enhancement are typically somewhat smaller than the calculated ones. The results demonstrate the caveats for FDTD simulations and the potential and the limitations of “near field photography” by local ablation and melting for the mapping of complex plasmon fields and their applications
Femtosecond-resolved ablation dynamics of Si in the near field of a small dielectric particle
Beilstein J. Nanotechnol. 2013, 4, 501–509, doi:10.3762/bjnano.4.59
- “Rocasolano”, CSIC, Serrano 119, 28006 Madrid, Spain 10.3762/bjnano.4.59 Abstract In this work we analyze the ablation dynamics of crystalline Si in the intense near field generated by a small dielectric particle located at the material surface when being irradiated with an infrared femtosecond laser pulse
- span from 0.1 ps to about 1 ns. Characteristic phenomena like electron plasma formation, ultrafast melting and ablation, along with their characteristic time scales are observed in the region surrounding the particle. The use of a time resolved imaging technique allows us recording simultaneously the
- material response at ordinary and large peak power densities enabling a direct comparison between both scenarios. The time resolved images of near field exposed regions are consistent with a remarkable temporal shift of the ablation onset which occurs in the sub-picosend regime, from about 500 to 800 fs
Structural and thermoelectric properties of TMGa3 (TM = Fe, Co) thin films
Beilstein J. Nanotechnol. 2013, 4, 461–466, doi:10.3762/bjnano.4.54
- purpose. However, it turned out that the pressed targets were not sufficiently stable but rather mechanically disintegrated during the ablation process. Thus, alternatively, thermal grain-by-grain evaporation from a powder source was applied leading to an averaging of the chemical composition over the
Hydrogen-plasma-induced magnetocrystalline anisotropy ordering in self-assembled magnetic nanoparticle monolayers
Beilstein J. Nanotechnol. 2013, 4, 164–172, doi:10.3762/bjnano.4.16
- with a FEI Helios Dual Beam FIB by cutting through a suitable particle agglomeration. The lamella was subsequently thinned down to a thickness of 20 nm. In order to protect the particles from contamination and possible ablation by gallium ions, an additional thin protective layer of platinum was
- wafer. Particles on top of the substrate (blue) are covered by a thin layer of Pt of approximately 15 nm thickness (green), to prevent oxidation, and an additional 15 nm Pt layer (bright green) deposited before cutting the lamella, to protect the sample from ablation by gallium ions. During the
Functionalization of vertically aligned carbon nanotubes
Beilstein J. Nanotechnol. 2013, 4, 129–152, doi:10.3762/bjnano.4.14
- were the synthesis on a large scale, the reproducibility, and the control of the diameter and number of walls of the CNTs using different synthesis techniques such as arc discharge, laser ablation or chemical vapor deposition. After these issues had been addressed, the focus in carbon nanotube research
- synthesize non-aligned CNTs, such as chemical vapor deposition (CVD), electrical arc discharge, or laser ablation, CVD has been reported to be the best for the synthesis of VA-CNTs. Different versions of CVD for the synthesis of VA-CNTs have been used, which can be mainly divided in two types: those
Diamond nanophotonics
Beilstein J. Nanotechnol. 2012, 3, 895–908, doi:10.3762/bjnano.3.100
- additional refraction for the emitted fluorescence light. The ringlike ablation material at the bottom of the SIL lies within a spatial angle that is not detected by the high NA microscope objective of 0.95. With such a microscopic diamond hemisphere, fluorescence count rates up to about 480 kHz were
Characterization and properties of micro- and nanowires of controlled size, composition, and geometry fabricated by electrodeposition and ion-track technology
Beilstein J. Nanotechnol. 2012, 3, 860–883, doi:10.3762/bjnano.3.97
- deposition, laser ablation, or thermal evaporation. The first template-grown nanowires of amorphous Si were recently reported by using ionic liquids [100][101]. Ionic liquids have proved to be a good alternative electrolyte to fabricate materials such as Al, Ti, Si, or Ge, which cannot be electrodeposited in
Tuning the properties of magnetic thin films by interaction with periodic nanostructures
Beilstein J. Nanotechnol. 2012, 3, 831–842, doi:10.3762/bjnano.3.93
- . After the preparation of the non-close-packed PS nanostructure, subsequent growth of magnetic films can be carried out in standard deposition chambers under ultrahigh-vacuum conditions. The percolated magnetic films discussed below were deposited either by pulsed laser ablation (Fe films) or e-beam
Influence of the diameter of single-walled carbon nanotube bundles on the optoelectronic performance of dry-deposited thin films
Beilstein J. Nanotechnol. 2012, 3, 692–702, doi:10.3762/bjnano.3.79
- sample-preparation routes. For example, Hecht et al. induced mechanical damage to liquid-suspended SWCNT bundles synthesized with the arc discharge and laser ablation methods, and were thus able to control the bundle lengths and diameters to some extent [14]. Geng et al. conducted a more thorough
- comparison between the performances of SWCNT networks from chemical vapor deposition (CVD), HiPCO, laser ablation, and arc discharge sources; although, again involving liquid suspensions [15]. While these initial studies have been steps in the right direction, the damage induced by sample preparation and the
Assessing the plasmonics of gold nano-triangles with higher order laser modes
Beilstein J. Nanotechnol. 2012, 3, 674–683, doi:10.3762/bjnano.3.77
- ], photopolymerisation [6] and near-field ablation [3][10][11] have been performed. It was found that the material of the triangles plays a distinct role [9], as do the triangles' edge length and height [3][8][10][11] and the material of the underlying substrate [12]. Additionally, nano-particles and nano-particle
Synthesis and electrical characterization of intrinsic and in situ doped Si nanowires using a novel precursor
Beilstein J. Nanotechnol. 2012, 3, 564–569, doi:10.3762/bjnano.3.65
- achieve NWs with tailored properties, namely chemical vapor deposition (CVD) [11], metal–organic CVD [12], molecular-beam epitaxy [13] and laser ablation techniques [14]. In this work we focus on the well-established VLS growth mechanism [15][16], which has shown remarkable potential in the fabrication of
Directed deposition of silicon nanowires using neopentasilane as precursor and gold as catalyst
Beilstein J. Nanotechnol. 2012, 3, 535–545, doi:10.3762/bjnano.3.62
- nanosized wires (NW) of silicon including thermal evaporation [9], molecular beam epitaxy [10], laser ablation [11], chemical vapor deposition (CVD) [12] and CVD in combination with the vapor–liquid–solid (VLS) method [13]. In the VLS mechanism, small solid metal particles catalyze the decomposition of the
Substrate-mediated effects in photothermal patterning of alkanethiol self-assembled monolayers with microfocused continuous-wave lasers
Beilstein J. Nanotechnol. 2012, 3, 65–74, doi:10.3762/bjnano.3.8
- complications, such as surface melting and substrate ablation. Hence, the procedure has to be carefully optimized in order to ensure selective processing of the SAM [11][24]. Calculated surface-coverage profiles at a typical laser pulse length of τ = 1 ms are displayed in Figure 7. Clearly, an increase in the
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