Role of Femtosecond Pulsed Laser-Induced Atomic Redistribution in Bimetallic Au–Pd Nanorods on Optoelectronic and Catalytic Properties

ACS Nano ◽  
2021 ◽  
Author(s):  
Mohammadreza Nazemi ◽  
Sajanlal R. Panikkanvalappil ◽  
Chih-Kai Liao ◽  
Mahmoud A. Mahmoud ◽  
Mostafa A. El-Sayed
Keyword(s):  
Catalytic Properties ◽  
Pulsed Laser ◽  
Femtosecond Pulsed Laser

scholarly journals The role of samarium incorporated structural defects in ZnO thin films prepared by femtosecond pulsed laser deposition

2019 ◽  
Vol 800 ◽  
pp. 191-197 ◽  
Author(s):  
Jaweria Zartaj Hashmi ◽  
Khurram Siraj ◽  
Anwar Latif ◽  
Shahzad Naseem ◽  
Mathew Murray ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Structural Defects ◽  
Zno Thin Films ◽  
Femtosecond Pulsed Laser

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

Two-photon-excited fluorescence from silicate glass containing tantalum ions pumped by a near-infrared femtosecond pulsed laser

2006 ◽  
Vol 31 (19) ◽  
pp. 2867 ◽  
Author(s):  
Xiangeng Meng ◽  
Katsuhisa Tanaka ◽  
Shunsuke Murai ◽  
Koji Fujita ◽  
Kiyotaka Miura ◽  
...  
Keyword(s):  
Silicate Glass ◽  
Near Infrared ◽  
Pulsed Laser ◽  
Two Photon ◽  
Femtosecond Pulsed Laser

scholarly journals Femtosecond pulsed laser microscopy: a new tool to assess the in vitro delivered dose of carbon nanotubes in cell culture experiments

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Dominique Lison ◽  
Saloua Ibouraadaten ◽  
Sybille van den Brule ◽  
Milica Todea ◽  
Adriana Vulpoi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cell Culture ◽  
Pulsed Laser ◽  
Lung Fibroblasts ◽  
Laser Microscopy ◽  
Cell Responses ◽  
The Impact ◽  
Delivered Dose ◽  
Femtosecond Pulsed Laser

Abstract Background In vitro models are widely used in nanotoxicology. In these assays, a careful documentation of the fraction of nanomaterials that reaches the cells, i.e. the in vitro delivered dose, is a critical element for the interpretation of the data. The in vitro delivered dose can be measured by quantifying the amount of material in contact with the cells, or can be estimated by applying particokinetic models. For carbon nanotubes (CNTs), the determination of the in vitro delivered dose is not evident because their quantification in biological matrices is difficult, and particokinetic models are not adapted to high aspect ratio materials. Here, we applied a rapid and direct approach, based on femtosecond pulsed laser microscopy (FPLM), to assess the in vitro delivered dose of multi-walled CNTs (MWCNTs). Methods and results We incubated mouse lung fibroblasts (MLg) and differentiated human monocytic cells (THP-1) in 96-well plates for 24 h with a set of different MWCNTs. The cytotoxic response to the MWCNTs was evaluated using the WST-1 assay in both cell lines, and the pro-inflammatory response was determined by measuring the release of IL-1β by THP-1 cells. Contrasting cell responses were observed across the MWCNTs. The sedimentation rate of the different MWCNTs was assessed by monitoring turbidity decay with time in cell culture medium. These turbidity measurements revealed some differences among the MWCNT samples which, however, did not parallel the contrasting cell responses. FPLM measurements in cell culture wells revealed that the in vitro delivered MWCNT dose did not parallel sedimentation data, and suggested that cultured cells contributed to set up the delivered dose. The FPLM data allowed, for each MWCNT sample, an adjustment of the measured cytotoxicity and IL-1β responses to the delivered doses. This adjusted in vitro activity led to another toxicity ranking of the MWCNT samples as compared to the unadjusted activities. In macrophages, this adjusted ranking was consistent with existing knowledge on the impact of surface MWCNT functionalization on cytotoxicity, and might better reflect the intrinsic activity of the MWCNT samples. Conclusion The present study further highlights the need to estimate the in vitro delivered dose in cell culture experiments with nanomaterials. The FPLM measurement of the in vitro delivered dose of MWCNTs can enrich experimental results, and may refine our understanding of their interactions with cells.

Measurement of the apex temperature of a nanoscale semiconducting field emitter illuminated by a femtosecond pulsed laser

2018 ◽  
Vol 124 (24) ◽  
pp. 245105
Author(s):  
A. Kumar ◽  
J. Bogdanowicz ◽  
J. Demeulemeester ◽  
J. Bran ◽  
D. Melkonyan ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Field Emitter ◽  
Femtosecond Pulsed Laser

Role of target conditioning on the thermo-optical response of bismuth nanostructures produced by pulsed laser deposition

2012 ◽  
Vol 110 (4) ◽  
pp. 863-867 ◽  
Author(s):  
R. Serna ◽  
M. Jiménez de Castro ◽  
J. Toudert ◽  
E. Haro-Poniatowski ◽  
J. García López
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Optical Response ◽  
Laser Deposition
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