scholarly journals In situ redox control and Raman spectroscopic characterisation of solutions below 300 °C

2021 ◽  
pp. 1-5
Author(s):  
I.-M. Chou ◽  
R. Wang ◽  
J. Fang
Keyword(s):  
Redox Control ◽  
Raman Spectroscopic ◽  
Spectroscopic Characterisation

scholarly journals In situ non-invasive Raman spectroscopic characterisation of succinic acid polymorphism during segmented flow crystallisation

2020 ◽  
Vol 5 (1) ◽  
pp. 294-303 ◽  
Author(s):  
Anuradha R. Pallipurath ◽  
Pierre-Baptiste Flandrin ◽  
Lois E. Wayment ◽  
Chick C. Wilson ◽  
Karen Robertson
Keyword(s):  
Raman Spectroscopy ◽  
Crystal Growth ◽  
Succinic Acid ◽  
Segmented Flow ◽  
Confocal Raman Spectroscopy ◽  
Raman Spectroscopic ◽  
Non Invasive ◽  
Confocal Raman ◽  
Spectroscopic Characterisation

Non-invasive confocal Raman spectroscopy has been integrated into a highly controllable tri-segmented flow crystallisation environment to uncover the crystallisation pathway from nucleation to crystal growth of the polymorphic compound succinic acid.

An in situ Raman spectroscopic method for quantification of polyethylene glycol (PEG) in waterlogged archaeological wood

Holzforschung ◽  
2020 ◽  
Vol 74 (11) ◽  
pp. 1043-1051
Author(s):  
Åke Henrik-Klemens ◽  
Katarina Abrahamsson ◽  
Charlotte Björdal ◽  
Alexandra Walsh
Keyword(s):  
Polyethylene Glycol ◽  
Spectroscopic Method ◽  
Calibration Model ◽  
Efficient Treatment ◽  
Raman Spectroscopic ◽  
Archaeological Wood ◽  
Validation Set ◽  
Impregnation Period ◽  
Polymer Impregnation

AbstractThe weakened microstructure of archaeological wood (AW) objects from waterlogged environments necessitates consolidation to avoid anisotropic shrinkage upon drying. Polymer impregnation through submergence or spraying treatments is commonly applied, and for larger and thicker objects, the impregnation period can stretch over decades. Thus, for efficient treatment, continuous monitoring of the impregnation status is required. Today, such monitoring is often destructive and expensive, requiring segments for extraction and chromatographic quantification. This study proposes an in situ Raman spectroscopic method for quantification of polyethylene glycol (PEG) in waterlogged AW. A calibration model was built on standards of PEG, cellulose powder, and milled wood lignin using orthogonal partial least squares (OPLS). The OPLS model had a strong linear relationship, and the PEG content in wood of varying degrees of degradation could be determined. However, the accuracy of the model was low with a root mean square error of prediction of 11 wt%. The low accuracy was traced to the heterogeneity in the calibration and validation set samples with regard to the small probing volume of the confocal instrumental setup.

In situ Raman Spectroscopic Observation of Polymer Chains in Semi-Crystalline Polyethylene Solids

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Yusuke Hiejima ◽  
Takumitsu Kida ◽  
Koh-hei Nitta
Keyword(s):  
Conformational Changes ◽  
Tensile Elongation ◽  
Spectroscopic Observation ◽  
Polymer Chains ◽  
Trans Conformation ◽  
Raman Spectroscopic ◽  
Higher Temperature ◽  
Microscopic Origin ◽  
Crystalline Polyethylene

AbstractIn situ Raman spectroscopy is applied for polyethylene solid under various environments to elucidate the morphological and conformational changes. The trans conformation retains up to higher temperature for high-density polyethylene, reflecting higher stability of the orthorhombic crystals composed of stacked trans chains. It is suggested that the conversion of the non-crystalline trans chains to the crystalline phase is the microscopic origin of thermal history in the crystallinity, whereas the transformation between the trans and gauche conformers is practically in thermal equilibrium. Microscopic and dynamic mechanism of deformation during uniaxial stretching is investigated for the molecular orientation and the microscopic load sharing on the crystalline and amorphous chains. Lower crystallinity results in smoother and higher orientation toward the stretching direction, as well as higher load on the amorphous chains, during tensile elongation.

Mapping gold nanoparticles on and in edible leaves in situ using surface enhanced Raman spectroscopy

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60152-60159 ◽  
Author(s):  
Zhiyun Zhang ◽  
Huiyuan Guo ◽  
Yingqing Deng ◽  
Baoshan Xing ◽  
Lili He
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Mapping Technique ◽  
Raman Spectroscopic ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Spinach Leaves

A surface enhanced Raman spectroscopic (SERS) mapping technique was applied to qualitatively detect and characterize gold nanoparticles on and in spinach leaves in situ.

Electrochemical and insitu Raman Spectroscopic Studies of Poly{(pyrrole-2,5-diyl)[(p-N,N-dimethylamino)benzylidene]}

2001 ◽  
Vol 17 (10) ◽  
pp. 908-912
Author(s):  
Yan Wei ◽  
◽  
◽  
Wei Zhi-Xiang ◽  
Wang Li-Li ◽  
...  
Keyword(s):  
Spectroscopic Studies ◽  
Raman Spectroscopic ◽  
In Situ Raman

In situ Raman spectroscopic study of marble capitals in the Alhambra monumental ensemble

inArt 2016 ◽  
2017 ◽  
pp. 87-94
Author(s):  
Paz Arjonilla ◽  
Ana Domínguez-Vidal ◽  
María Jose´ de la Torre López ◽  
Ramón Rubio-Domene ◽  
María José Ayora-Cañada
Keyword(s):  
Spectroscopic Study ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
In Situ Raman
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