Raman Applications in Foams

Amer, Mäher S.

doi:10.1002/9780470475997.ch7

Cited by 13 publications

(14 citation statements)

References 39 publications

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“…Organic semiconductors typically have large Raman scattering cross-sections for vibrational modes that are coupled to the p-p* electronic excitations, thus allowing the structural changes within thin (<100 nm) films to be investigated. 44 Raman spectroscopy has previously been performed on a range of PFO films, 21,[45][46][47][48][49] including those containing a fraction of b-phase chain segments. However, in general the aforementioned reports only compared the Raman scattering spectra of a single b-phase PFO film with that of a reference zero b-phase Table 1 for details (glassy) film.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Spectroscopic properties of poly(9,9‐dioctylfluorene) thin films possessing varied fractions of β‐phase chain segments: enhanced photoluminescence efficiency via conformation structuring

Perevedentsev

Chander

Kim

et al. 2016

J Polym Sci B Polym Phys

126

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Poly(9,9‐dioctylfluorene) (PFO) is a widely studied blue‐emitting conjugated polymer, the optoelectronic properties of which are strongly affected by the presence of a well‐defined chain‐extended “β‐phase” conformational isomer. In this study, optical and Raman spectroscopy are used to systematically investigate the properties of PFO thin films featuring a varied fraction of β‐phase chain segments. Results show that the photoluminescence quantum efficiency (PLQE) of PFO films is highly sensitive to both the β‐phase fraction and the method by which it was induced. Notably, a PLQE of ∼69% is measured for PFO films possessing a ∼6% β‐phase fraction induced by immersion in solvent/nonsolvent mixtures; this value is substantially higher than the average PLQE of ∼55% recorded for other β‐phase films. Furthermore, a linear relationship is observed between the intensity ratios of selected Raman peaks and the β‐phase fraction determined by commonly used absorption calibrations, suggesting that Raman spectroscopy can be used as an alternative means to quantify the β‐phase fraction. As a specific example, spatial Raman mapping is used to image a mm‐scale β‐phase stripe patterned in a glassy PFO film, with the extracted β‐phase fraction showing excellent agreement with the results of optical spectroscopy. © 2016 The Authors. Journal of Polymer Science Part B: Polymer Physics Published by Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1995–2006

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Section: Raman Spectroscopymentioning

confidence: 99%

Spectroscopic properties of poly(9,9‐dioctylfluorene) thin films possessing varied fractions of β‐phase chain segments: enhanced photoluminescence efficiency via conformation structuring

Perevedentsev

Chander

Kim

et al. 2016

J Polym Sci B Polym Phys

126

View full text Add to dashboard Cite

show abstract

“…32,[79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95] Some recent applications to biomaterials are discussed below. There is also an increasing amount of research on medical and clinical applications which include diagnostic applications such as atherosclerosis, breast cancer, Alzheimer's disease, blood analyses, skin studies, and identification of pathogenic microorganisms.…”

Section: Raman Microscopy and Imaging Applicationsmentioning

confidence: 99%

Infrared and Raman Microscopy and Imaging of Biomaterials

Kavukcuoglu

Pleshko

2011

Comprehensive Biomaterials

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“…As a consequence, the application of Raman spectroscopy for analysis has increased dramatically over the last years [3][4][5][6] and has become a useful tool for the investigation of bone material, offering simultaneous information on the properties of its organic matrix and mineral phase. The mineral/matrix ratio [i.e., mineral phase (PO 4 ) normalized to organic matrix (amide)] is a frequently used parameter to describe the bone matrix mineralization, with several studies demonstrating that this ratio is altered due to disease or during treatment.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the v2PO4/amide III ratio assessed by Raman spectroscopy and the calcium content measured by quantitative backscattered electron microscopy in healthy human osteonal bone

et al. 2014

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Abstract. Raman microspectroscopy and quantitative backscattered electron imaging (qBEI) of bone are powerful tools to investigate bone material properties. Both methods provide information on the degree of bone matrix mineralization. However, a head-to-head comparison of these outcomes from identical bone areas has not been performed to date. In femoral midshaft cross sections of three women, 99 regions (20 × 20 μm 2 ) were selected inside osteons and interstitial bone covering a wide range of matrix mineralization. As the focus of this study was only on regions undergoing secondary mineralization, zones exhibiting a distinct gradient in mineral content close to the mineralization front were excluded. The same regions were measured by both methods. We found a linear correlation (R 2 ¼ 0.75) between mineral/matrix as measured by Raman spectroscopy and the wt: %Mineral∕ð100-wt: %MineralÞ as obtained by qBEI, in good agreement with theoretical estimations. The observed deviations of single values from the linear regression line were determined to reflect biological heterogeneities. The data of this study demonstrate the good correspondence between Raman and qBEI outcomes in describing tissue mineralization. The obtained correlation is likely sensitive to changes in bone tissue composition, providing an approach to detect potential deviations from normal bone. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

Raman Applications in Foams

Cited by 13 publications

References 39 publications

Spectroscopic properties of poly(9,9‐dioctylfluorene) thin films possessing varied fractions of β‐phase chain segments: enhanced photoluminescence efficiency via conformation structuring

Spectroscopic properties of poly(9,9‐dioctylfluorene) thin films possessing varied fractions of β‐phase chain segments: enhanced photoluminescence efficiency via conformation structuring

Infrared and Raman Microscopy and Imaging of Biomaterials

Relationship between the v2PO4/amide III ratio assessed by Raman spectroscopy and the calcium content measured by quantitative backscattered electron microscopy in healthy human osteonal bone

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