Time resolved schlieren study of sub-pecosecond and nanosecond laser transfer of biomaterials

2005 ◽  
Vol 247 (1-4) ◽  
pp. 584-589 ◽  
Author(s):  
I. Zergioti ◽  
A. Karaiskou ◽  
D.G. Papazoglou ◽  
C. Fotakis ◽  
M. Kapsetaki ◽  
...  
Keyword(s):  
Nanosecond Laser ◽  
Time Resolved ◽  
Laser Transfer

Erratum to “Time resolved schlieren study of sub-picosecond and nanosecond laser transfer of biomaterials” [Applied Surface Science 247 (2005) 584–589]

2005 ◽  
Vol 249 (1-4) ◽  
pp. 433 ◽  
Author(s):  
I. Zergioti ◽  
A. Karaiskou ◽  
D.G. Papazoglou ◽  
C. Fotakis ◽  
M. Kapsetaki ◽  
...  
Keyword(s):  
Surface Science ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Laser Transfer

scholarly journals Fabrication of Photofunctional Nanoporous Membrane and Its Photoinactivation Effect of Vesicular Stomatitis Virus

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Kang-Kyun Wang ◽  
Bong-Jin Kim ◽  
Si-Hwan Ko ◽  
Dong Hoon Choi ◽  
Yong-Rok Kim
Keyword(s):  
Vesicular Stomatitis Virus ◽  
Photophysical Properties ◽  
Antiviral Effect ◽  
Nanosecond Laser ◽  
Alumina Membrane ◽  
Time Resolved ◽  
Nanoporous Alumina ◽  
Animal Virus ◽  
Covalently Bonded ◽  
Vesicular Stomatitis

Fabrication and photophysical study of photofunctional nanoporous alumina membrane (PNAM) were performed, and its application of photodynamic antimicrobial chemotherapy (PACT) was investigated. Nanoporous alumina membrane (NAM) was fabricated by two-step aluminium anodic oxidation process. Surface of the fabricated NAM was modified with organo-silane agent to induce covalent bonding between NAM and a photosensitizer (PtCP: [5,10,15-triphenyl-20-(4-methoxycarbonylphenyl)-porphyrin] platinum). PtCP was covalently bonded to the surface of the modified NAM by nucleophilic acyl substitution reaction process. The morphology and the photophysical properties of the fabricated PNAM were confirmed with field emission scanning electron microscope (FE-SEM), steady-state spectroscopies, and nanosecond laser-induced time-resolved spectroscopy. For the efficacy study of PNAM in PACT, an enveloped animal virus, vesicular stomatitis virus (VSV), was utilized as a target organism. Antiviral effect of the PNAM-PACT was measured by the extent of suppression of plaque-forming units (PFU) after the light irradiation. In the cultures inoculated with PACT-treated VSV, the suppression of PFU was prominent, which demonstrates that PNAM is a potential bio clean-up tool.

Time-resolved study of the mechanical response of tissue phantoms to nanosecond laser pulses

2011 ◽  
Vol 16 (11) ◽  
pp. 115001 ◽  
Author(s):  
Francisco G. Pérez-Gutiérrez ◽  
Santiago Camacho-López ◽  
Guillermo Aguilar
Keyword(s):  
Mechanical Response ◽  
Laser Pulses ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Tissue Phantoms ◽  
Nanosecond Laser Pulses

scholarly journals Multispectral LIF-Based Standoff Detection System for the Classification of CBE Hazards by Spectral and Temporal Features

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2524 ◽  
Author(s):  
Lea Fellner ◽  
Marian Kraus ◽  
Florian Gebert ◽  
Arne Walter ◽  
Frank Duschek
Keyword(s):  
Spectral Data ◽  
Classification Accuracy ◽  
Detection System ◽  
Laser Source ◽  
Nanosecond Laser ◽  
Time Resolved Fluorescence ◽  
Data Set ◽  
Time Resolved ◽  
Standoff Detection

Laser-induced fluorescence (LIF) is a well-established technique for monitoring chemical processes and for the standoff detection of biological substances because of its simple technical implementation and high sensitivity. Frequently, standoff LIF spectra from large molecules and bio-agents are only slightly structured and a gain of deeper information, such as classification, let alone identification, might become challenging. Improving the LIF technology by recording spectral and additionally time-resolved fluorescence emission, a significant gain of information can be achieved. This work presents results from a LIF based detection system and an analysis of the influence of time-resolved data on the classification accuracy. A multi-wavelength sub-nanosecond laser source is used to acquire spectral and time-resolved data from a standoff distance of 3.5 m. The data set contains data from seven different bacterial species and six types of oil. Classification is performed with a decision tree algorithm separately for spectral data, time-resolved data and the combination of both. The first findings show a valuable contribution of time-resolved fluorescence data to the classification of the investigated chemical and biological agents to their species level. Temporal and spectral data have been proven as partly complementary. The classification accuracy is increased from 86% for spectral data only to more than 92%.

Au-Cluster Redistribution During Nanosecond Laser-Annealing of Metal/Insulator Matrices

1985 ◽  
Vol 51 ◽  
Author(s):  
W. Pamler ◽  
E. E. Marinero ◽  
M. Chen ◽  
V. B. Jipson
Keyword(s):  
Laser Annealing ◽  
Depth Profiling ◽  
Nanosecond Laser ◽  
Laser Interaction ◽  
X Ray Diffraction ◽  
Metal Insulator ◽  
Time Resolved ◽  
Au Clusters ◽  
Excimer Laser Radiation ◽  
Compositional Changes

ABSTRACTWe report on the growth and redistribution of Au clusters caused by nanosecond laser interaction of Aux(TeO2 )1−x thin films with intense excimer laser radiation. This laser-induced phenomenon is studied in a time-resolved manner using transient reflectivity and transmissivity techniques. Structural and compositional changes are investigated using Rutherford Backscattering, XPS depth profiling, x-ray diffraction and conductivity measurements. Our studies indicate that melting of the binary structure initializes segregation, growth and coalescence of Au crystallites in the amorphous TeO2 matrix.

Spectroscopic Study of Ultrashort Pulse Laser-Breakdown Plasmas in Air

2002 ◽  
Vol 56 (11) ◽  
pp. 1444-1452 ◽  
Author(s):  
F. Martin ◽  
R. Mawassi ◽  
F. Vidal ◽  
I. Gallimberti ◽  
D. Comtois ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Continuum Emission ◽  
Growth Time ◽  
Nanosecond Laser ◽  
Positive System ◽  
Time Resolved ◽  
Ultrashort Pulse Laser ◽  
Laser Breakdown ◽  
Molecular Lines ◽  
Atomic Lines

Time-resolved visible spectroscopy of plasmas produced by laser breakdown of air using femtosecond Nd laser pulses (50–300 mJ, 500 fs) reveals features not observed with nanosecond laser pulses. Emission is initially dominated by molecular lines, specifically the second positive system of N2 and the first negative system of N2+. This is followed by continuum emission with a growth time of ∼3 ns and a decay time of ∼30 ns. Atomic lines of N and O emerge from the decay of the continuum and last up to 1 μs; only faint ionization lines are observed. Several of the atomic lines are initially strongly broadened, narrowing over a period of 100 ns.

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