Coherent Raman imaging thermometry with in-situ referencing of the impulsive excitation efficiency

2020 ◽  
Author(s):  
Francesco Mazza ◽  
Leonardo Castellanos ◽  
Dmitrii Kliukin ◽  
Alexis Bohlin
Keyword(s):  
Raman Imaging ◽  
Excitation Efficiency ◽  
Impulsive Excitation ◽  
Coherent Raman

scholarly journals In Situ Hyperspectral Raman Imaging: A New Method to Investigate Sintering Processes of Ceramic Material at High-temperature

2019 ◽  
Vol 9 (7) ◽  
pp. 1310 ◽  
Author(s):  
Kerstin Hauke ◽  
Johannes Kehren ◽  
Nadine Böhme ◽  
Sinje Zimmer ◽  
Thorsten Geisler
Keyword(s):  
High Temperature ◽  
Raman Imaging ◽  
In Situ Studies ◽  
Kinetic Information ◽  
Novel Approach ◽  
In Situ Investigation ◽  
Dependent Growth ◽  
Micrometer Scale ◽  
Sintering Processes

In the last decades, Raman spectroscopy has become an important tool to identify and investigate minerals, gases, glasses, and organic material at room temperature. In combination with high-temperature and high-pressure devices, however, the in situ investigation of mineral transformation reactions and their kinetics is nowadays also possible. Here, we present a novel approach to in situ studies for the sintering process of silicate ceramics by hyperspectral Raman imaging. This imaging technique allows studying high-temperature solid-solid and/or solid-melt reactions spatially and temporally resolved, and opens up new avenues to study and visualize high-temperature sintering processes in multi-component systems. After describing in detail the methodology, the results of three application examples are presented and discussed. These experiments demonstrate the power of hyperspectral Raman imaging for in situ studies of the mechanism(s) of solid-solid or solid-melt reactions at high-temperature with a micrometer-scale resolution as well as to gain kinetic information from the temperature- and time-dependent growth and breakdown of minerals during isothermal or isochronal sintering.

scholarly journals Spectroscopic coherent Raman imaging of Caenorhabditis elegans reveals lipid particle diversity

2020 ◽  
Vol 16 (10) ◽  
pp. 1087-1095 ◽  
Author(s):  
Wei-Wen Chen ◽  
George A. Lemieux ◽  
Charles H. Camp ◽  
Ta-Chau Chang ◽  
Kaveh Ashrafi ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Raman Imaging ◽  
Lipid Particle ◽  
Coherent Raman

scholarly journals Correlated interfacial water transport and proton conductivity in perfluorosulfonic acid membranes

2019 ◽  
Vol 116 (18) ◽  
pp. 8715-8720 ◽  
Author(s):  
Xiao Ling ◽  
Mischa Bonn ◽  
Katrin F. Domke ◽  
Sapun H. Parekh
Keyword(s):  
Water Transport ◽  
Proton Conductivity ◽  
Proton Exchange ◽  
Interfacial Water ◽  
Total Water ◽  
Perfluorosulfonic Acid ◽  
Water Diffusivity ◽  
Perfluorosulfonic Acid Membranes ◽  
Coherent Raman

Water must be effectively transported and is also essential for maximizing proton conductivity within fuel-cell proton-exchange membranes (PEMs). Therefore, identifying relationships between PEM properties, water transport, and proton conductivity is essential for designing optimal PEMs. Here, we use coherent Raman spectroscopy to quantify real-time, in situ diffusivities of water subspecies, bulk-like and nonbulk-like (interfacial) water, in five different perfluorosulfonic acid (PFSA) PEMs. Although the PEMs were chemically diverse, water transport within them followed the same rule: Total water diffusivity could be represented by a linear combination of the bulk-like and interfacial water diffusivities. Moreover, the diffusivity of interfacial water was consistently larger than that of bulk-like water. These measurements of microscopic transport were combined with through-plane proton conductivity measurements to reveal the correlation between interfacial water transport and proton conductivity. Our results demonstrate the importance of maximizing the diffusivity and fractional contribution of interfacial water to maximize the proton conductivity in PFSA PEMs.

Raman imaging of heme metabolism in situ in macrophages and Kupffer cells

The Analyst ◽  
2018 ◽  
Vol 143 (14) ◽  
pp. 3489-3498 ◽  
Author(s):  
J. Dybas ◽  
M. Grosicki ◽  
M. Baranska ◽  
K. M. Marzec
Keyword(s):  
Cell Line ◽  
Kupffer Cells ◽  
Blood Cells ◽  
Raman Imaging ◽  
Raw 264.7 ◽  
Murine Macrophage ◽  
Macrophage Cell Line ◽  
Macrophage Cell ◽  
Imaging Results

Herein, we provide the Raman imaging results for different stages of erythrophagocytosis of senescent red blood cells executed by isolated murine primary Kupffer cells and a murine macrophage cell line (RAW 264.7).

Broadband coherent Raman imaging for multiplexed detection

2011 ◽  
Author(s):  
Brad Littleton ◽  
Fred Festy ◽  
Simon Ameer-Beg ◽  
David Richards
Keyword(s):  
Raman Imaging ◽  
Multiplexed Detection ◽  
Coherent Raman

Design of Matched Optical Pulses for Coherent Raman Imaging

2009 ◽  
Vol 20 (12) ◽  
pp. 31
Author(s):  
Joseph B. Geddes III ◽  
Daniel L. Marks ◽  
Stephen A. Boppart
Keyword(s):  
Raman Imaging ◽  
Optical Pulses ◽  
Coherent Raman

In situ Raman imaging of interdiffusion in a microchannel

2005 ◽  
Vol 86 (9) ◽  
pp. 094106 ◽  
Author(s):  
Jean-Baptiste Salmon ◽  
Armand Ajdari ◽  
Patrick Tabeling ◽  
Laurent Servant ◽  
David Talaga ◽  
...  
Keyword(s):  
Raman Imaging ◽  
In Situ Raman
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