Raman spectroscopic surface characterization of cellulose derivatives

Meyer, Norbert; Nestler, Klaus; Engisch, Lutz; Marx, G.; Füting, M.; Kiesow, Andreas; Heilmann, Andreas; Wartewig, S.; Kleinebudde, Peter

doi:10.1007/s002160100864

Cited by 7 publications

(3 citation statements)

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“…The four components of the polymeric films are Raman active species, as reported elsewhere [25,26,27,28], where PAR and PVP show notorious band-rich spectra. However, its SERS behavior has been mainly reported for PAR and less for the polymeric compounds.…”

Section: Sers and Raman Spectrasupporting

confidence: 59%

SERS hyperspectral imaging assisted by MCR-ALS for studying polymeric microfilms loaded with paracetamol

Mamián-López

Poppi

2015

Microchemical Journal

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In this study, a combination of the high detectability and specificity of the SERS technique with powerful chemometric tools was used to obtain hyperspectral images in order to assess the chemical distribution of the components of polymeric microfilms loaded with paracetamol as active principle. Four microfilms with drug content ranging between 5.42 and 18.62% were fabricated directly over nanostructured gold substrates and spectra were acquired over an area of 4 × 4 mm. Chemical images were first built following a qualitative approach by applying principal component analysis (PCA) and calculating correlation coefficients. With the algorithm multivariate curve resolution-alternating least squares (MCR-ALS), the mean concentrations of all components were calculated with relative error values between 3.5 and 4.9% for paracetamol. With the proposed methodology, both qualitative and quantitative assessments of the distribution of constituents of polymeric microfilms were successfully performed. In addition, physical-chemistry interactions among them could be also analyzed.

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Section: Sers and Raman Spectrasupporting

confidence: 59%

SERS hyperspectral imaging assisted by MCR-ALS for studying polymeric microfilms loaded with paracetamol

Mamián-López

Poppi

2015

Microchemical Journal

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“…Variable pressure scanning electron microscopes (SEMs) can tolerate a low vacuum (0.1-20 Torr, equivalent to 0.013-2.7 kPa) environment in the specimen chamber [1]. The absence of chronic charging artefacts and constraints imposed by high vacuum has broadened the scope of SEM microcharacterization to a wide range of materials such as hydrated bulk polymers [2][3][4][5], thin films at liquid-gas interfaces [3,6], biomaterials [7,8] and liquids [9][10][11]. It has been suggested that secondary electron (SE) images of such materials can contain contrast produced by lateral variations in electronic structure (in the absence of charging) [9], and in the degree of charging exhibited by insulating specimens [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Quantification of electron-ion recombination in an electron-beam-irradiated gas capacitor

Toth¹,

Daniels²,

Thiel³

et al. 2002

J. Phys. D: Appl. Phys.

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A model is developed for electron-ion recombination in a gas capacitor in which the cathode is irradiated simultaneously by an electron beam and a defocused flux of soft-landing ions, under conditions such as encountered in variable pressure scanning electron microscopes (SEMs). The model describes the dependence of the secondary electron (SE) emission current (injected into the gas from the cathode) on the distance above the cathode, and the effects of SE-ion recombination on electron imaging signals utilized in SEMs. The model is tested experimentally, and is used to construct a simple procedure for quantification of the effects of SE-ion recombination on emissive signals in a gas capacitor. The presented method allows for quantification of electron emission current measurements obtained in a variable pressure SEM.

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“…Porém, é possível fazer algumas associações com suas respectivas respostas Raman e identificar as principais bandas [68][69][70][71]. Como mostrado nas Fig.…”

Section: Características Sers Dos Componentes Dos Filmesunclassified

Espectroscopia Raman amplificada por superfície em aplicações analíticas assistidas por ferramentas quimiométricas

López¹

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Raman spectroscopic surface characterization of cellulose derivatives

Abstract: First results of experiments on the surface characterization of cellulose derivatives are presented. Different water contents of the surface of microcrystalline cellulose have been investigated by means of Raman spectroscopy, SERS, and environmental scanning electron microscopy (ESEM).

Cited by 7 publications

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SERS hyperspectral imaging assisted by MCR-ALS for studying polymeric microfilms loaded with paracetamol

SERS hyperspectral imaging assisted by MCR-ALS for studying polymeric microfilms loaded with paracetamol

Quantification of electron-ion recombination in an electron-beam-irradiated gas capacitor

Espectroscopia Raman amplificada por superfície em aplicações analíticas assistidas por ferramentas quimiométricas

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