Search query: Laser ablation method

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abstract: A method combining laser ablation cluster formation and vapor liquid solid (VLS) growth was developed for the synthesis of semiconductor nanowires. In this process, laser ablation was used to prepare nanometer diameter catalyst clusters that define the size of wires produced by VLS growth. This approach was used to prepare bulk quantities of uniform single crystal silicon and germanium nanowires with diameters of 6 to 20 and 3 to 9 nanometers, respectively, and lengths ranging from 1 to 30 micrometers. Studies carried out with different conditions and catalyst materials confirmed the central details of the growth mechanism and suggest that well established phase diagrams can be used to predict rationally catalyst materials and growth conditions for the preparation of nanowires.
title: A laser ablation method for the synthesis of crystalline semiconductor nanowires
venue: Science
year: 1998

abstract: Abstract Pulsed laser ablation in liquid is an approach for micro /nanostructure generation directly from bulk materials. It has grown rapidly as a research field of photochemistry and physical chemistry in the last decade, and represents a combinatorial library of constituents and interactions, but the understanding of this library is still insufficient. This review attempts to build up a comprehensive mechanistic scenario of pulsed laser ablation in liquid and illustrate the underlying principles to micro /nanostructure generation. Various structures produced by this method have been summarized that provide prototypes for potential applications in sensing, optoelectronics, and biomedicine, etc.
author_names: Zijie Yan

Douglas B Chrisey
title: Pulsed laser ablation in liquid for micro /nanostructure generation
year: 2012

abstract: Abstract A continuous wave 250 W CO2 laser operating at 10.6 mm has been employed to evaporate graphite/bi metal targets in a vertical evaporation chamber. Without the help of an additional furnace, web like soot material has been easily produced. This contains high densities of bundles of single walled nanotubes (SWNTs) Electron microscopy, Raman spectroscopy and neutron diffraction show the high quality of the SWNT material. The use of this simple laser ablation system offers additional possibilities to study experimental parameters important for the formation of SWNTs leading to a better understanding of its growth mechanism.
author_names: Wolfgang K Maser

Edgar Munoz

Ana M Benito

M Teresa Martinez

G de la Fuente

Yves Maniette

Eric Anglaret

J L Sauvajol
title: Production of high density single walled nanotube material by a simple laser ablation method
year: 1998

abstract: Abstract The laser ablation method was employed to synthesize Ag nanoparticles. With the aid of the surfactants, SDS and CTAB, highly dispersed Ag particles were attained. Using a laser intensity of 120 mJ/pulse particle diameters of 4.2+ 1.9 nm were produced in SDS and 7.8+ 4.5 nm in CTAB. The anionic SDS and cationic CTAB exhibited differential ability in protecting Ag colloids: the particles containing SDS remained stable at least one month, while the CTAB protected Ag precipitated completely within one week. Plausible explanations were given to such stability observations. Moreover, the changes in the ablation laser powers were found to achieve particle size control. Lesser laser intensity of 60 mJ/pulse produced larger particle sizes of 6.8+ 2.7 nm and 9.4+ 5.9 nm in SDS and CTAB, respectively.
author_names: Yu-Hung Chen

Chen-Sheng Yeh
title: Laser ablation method: use of surfactants to form the dispersed Ag nanoparticles
year: 2002

abstract: By searching the title, publisher, or authors of guide you in point of fact want, you can discover them rapidly. In the house, workplace, or perhaps in your method can be every best place within net connections. If you seek to download and install the Laser Ablation In Liquids Principles And Applications In The Preparation Of Nanomaterials, it is categorically simple then, in the past currently we extend the connect to purchase and make bargains to download and install Laser Ablation In Liquids Principles And Applications In The Preparation Of Nanomaterials so simple!
author_names: Guowei Yang
title: Laser Ablation in Liquids: Principles and Applications in the Preparation of Nanomaterials
year: 2012

abstract: Abstract Laser ablation inductively coupled plasma mass spectrometry (LA ICP MS) has become a most powerful technique for the elemental analysis of individual, polyphase inclusions completely enclosed in minerals, be they solid or a solid liquid gas mixture at the time of measurement. Simultaneous, accurate quantification of major to ultra trace element concentrations from Li to U by well controlled ablation of the entire fluid or melt inclusion content and successful use of largely matrix independent external calibration protocols are unique features of this method. This contribution reviews fluid inclusion fundamentals relevant for their bulk analysis by LA ICP MS and discusses key aspects of the analytical protocol. Emphasis is on figures of merit (precision, accuracy) obtained from the analysis of individual inclusions and fluid inclusion assemblages, and procedures and technical developments to improving data quality are elaborated. A new equation for the calculation of detection limits for LA ICP MS analysis is presented, which closely follows IUPAC conventions. Applications are reviewed with emphasis on the use of synthetic fluid inclusions in constraining metal solubility and distribution between co existing phases. New data for natural bismuth "fluid" inclusions document the seamless transition to melt inclusion analysis by LA ICP MS, thus highlighting the fact that the procedures presented here are generally applicable to the analysis of inclusions in complex host minerals. Isotope ratio analysis of individual fluid inclusions by multicollector ICP MS (MC ICP MS) is a recent development that requires fast transient signals to be accurately recorded by instrumentation designed for high precision static measurements of long lasting stable ion beams. We address the general principles based on Pb isotopes and review a first application to the Bingham Canyon porphyry Cu Au Mo deposit. A pilot study using about 50 synthetic fluid inclusions containing SRM 987 Sr and variable NaCl, Ca, and Rb concentrations demonstrates that accurate 87 Sr/ 86 Sr isotope ratios can be obtained on an individual Rb poor fluid inclusion, at absolute 2 s precisions of 0.0003 to 0.002. A residual trend in 87 Sr/ 86 Sr as a function of the Rb/Sr abundance ratio in the fluid inclusions suggests that interference correction of 87 Rb on mass 87 assuming identical mass bias coefficients for the two elements may be inaccurate; however, the offset can be accurately corrected for by regressing the data to zero 87 Rb. The versatility and detection power of LA ICP MS makes this technique the method of choice for solute abundance and isotope ratio analysis of individual fluid inclusions. Significant future progress can be achieved by improvements in ion production, transmission and data recording efficiency and by further improving control on inclusion ablation by pulsed laser beams. Data quantification strategies may also have to be further refined to keep pace with instrumental progress and innovation.
author_names: Thomas Pettke

Felix Oberli

Andreas Audetat

Marcel Guillong

Adam C Simon

Jacob J Hanley

Leonhard M Klemm
title: Recent developments in element concentration and isotope ratio analysis of individual fluid inclusions by laser ablation single and multiple collector ICP MS
year: 2012

abstract: ABSTRACT New analytical techniques for multiparametric characterisation of individual cells are likely to reveal important information about the heterogeneity of immunological responses at the single cell level. In this proof of principle study, laser ablation inductively coupled plasma mass spectrometry (LA ICP MS) was applied to the problem of concurrently detecting 24 lineage and activation markers expressed by human leucocytes. This approach was sufficiently sensitive and specific to identify subpopulations of isolated T, B, and natural killer cells. Leucocyte subsets were also accurately detected within unfractionated peripheral blood mononuclear cells preparations. Accordingly, we judge LA ICP MS to be a suitable method for assessing expression of multiple tissue antigens in solid phase biological specimens, such as tissue sections, cytospins, or cells grown on slides. These results augur well for future development of LA ICP MS based bioimaging instruments for general users.
author_names: Robert W Hutchinson

Katherine M McLachlin

Paloma Riquelme

Jan Haarer

Christiane Broichhausen

Uwe Ritter

Edward Kenneth Geissler

James A Hutchinson
title: Laser Ablation Inductively Coupled Plasma Mass Spectrometry
venue: Transplantation direct
year: 2015

abstract: Laser ablation inductively coupled plasma mass spectrometry (LA ICP MS) was utilized for spatially resolved bioimaging of the distribution of silver and gold nanoparticles in individual fibroblast cells upon different incubation experiments. High spatial resolution was achieved by optimization of scan speed, ablation frequency, and laser energy. Nanoparticles are visualized with respect to cellular substructures and are found to accumulate in the perinuclear region with increasing incubation time. On the basis of matrix matched calibration, we developed a method for quantification of the number of metal nanoparticles at the single cell level. The results provide insight into nanoparticle/cell interactions and have implications for the development of analytical methods in tissue diagnostics and therapeutics.
author_names: Daniel Drescher

Charlotte Giesen

Heike Traub

Ulrich Panne

Janina Kneipp

Norbert Jakubowski
title: Quantitative imaging of gold and silver nanoparticles in single eukaryotic cells by laser ablation ICP MS.
venue: Analytical chemistry
year: 2012

abstract: BACKGROUND: Stereotactic laser ablation offers an advantage over open surgical procedures for treatment of epileptic foci, tumors, and other brain pathology. Robot assisted stereotactic laser ablation could offer an accurate, efficient, minimally invasive, and safe method for placement of an ablation catheter into the target. OBJECTIVE: To determine the feasibility of placement of a stereotactic laser ablation catheter into a brain lesion with the use of robotic assistance, via a safe, accurate, efficient, and minimally invasive manner. METHODS: A laser ablation catheter (Visualase, Inc) was placed by using robotic guidance (ROSA, Medtech Surgical, Inc) under general anesthesia into a localized epileptogenic periventricular heterotopic lesion in a 19 year old woman with 10 year refractory focal seizure history. The laser applicator (1.65 mm diameter) position was confirmed by using magnetic resonance imaging (MRI) Ablation using the Visualase system was performed under multiplanar imaging with real time thermal imaging and treatment estimates in each plane. A postablation MRI sequence (T1 postgadolinium contrast injection) was used to immediately confirm the ablation. RESULTS: MRI showed accurate skin entry point and trajectory, with the applicator advanced to the lesion's distal boundary. Ablation was accomplished in less than 3 minutes of heating. The overall procedure, from time of skin incision to end of last ablation, was approximately 90 minutes. After confirmation of proper lesioning by using a T1 contrast enhanced MRI, the applicator was removed, and the incision was closed using a single stitch. No hemorrhage or other untoward complication was visualized. The patient awoke without any complication, was observed overnight after admitting to a regular floor bed, and was discharged to home the following day. CONCLUSION: This technique, using a combination of Visualase laser ablation, ROSA robot, and intraoperative MRI, facilitated a safe, efficacious, efficient, and minimally invasive approach that could be used for placement of 1 or multiple electrodes in the future. ABBREVIATIONS: EEG, electroencephalography SEEG, stereoelectroencephalography
author_names: Jorge A Gonzalez-Martinez

Sumeet Vadera

Jeffrey P Mullin

Rei Enatsu

Andreas V Alexopoulos

Ravish V Patwardhan

William Bingaman

Imad M Najm
title: Robot Assisted Stereotactic Laser Ablation in Medically Intractable Epilepsy: Operative Technique
venue: Neurosurgery
year: 2014

abstract: In this paper, we demonstrated the fabrication of high active and high sensitive Au nanoparticles by laser ablation in liquid (LAL) method, and their application in electrochemical detection of heavy metal ions. First, LAL method are used to fabricate Au nanoparticles in water in a clean way. Second, the Au nanoparticles were assembled onto the surface of the glassy carbon (GC) electrode by an electrophoretic deposition method to form an AuNPs/GC electrode for electrochemical characterization and detection. Through differential pulse anodic stripping voltammetry method, it shows that the AuNPs/GC electrode could be used for the simultaneous and selective electrochemical detection of Cd(2+ Pb(2+ Cu(2+ and Hg(2+ By studying the influence of test conditions to optimize the electrochemical detection, we can detect Cd(2+ Pb(2+ Cu(2+ and Hg(2+ simultaneously with a low concentration of 3 x 10( 7) M in the experiments.
author_names: Xiaoxiao Xu

Guotao Duan

Yue Li

Guangqiang Liu

Jingjing Wang

Hongwen Zhang

Zhengfei Dai

Weiping Cai
title: Fabrication of gold nanoparticles by laser ablation in liquid and their application for simultaneous electrochemical detection of Cd2+ Pb2+ Cu2+ Hg2+
venue: ACS applied materials interfaces
year: 2014