Determination of Cellulose Crystallinity by Terahertz-Time Domain Spectroscopy

dc.creatorVieira, FS
dc.creatorPasquini, C
dc.date2014
dc.dateAPR 15
dc.date2014-07-30T14:39:02Z
dc.date2015-11-26T17:37:23Z
dc.date2014-07-30T14:39:02Z
dc.date2015-11-26T17:37:23Z
dc.date.accessioned2018-03-29T00:19:03Z
dc.date.available2018-03-29T00:19:03Z
dc.identifierAnalytical Chemistry. Amer Chemical Soc, v. 86, n. 8, n. 3780, n. 3786, 2014.
dc.identifier0003-2700
dc.identifier1520-6882
dc.identifierWOS:000334658000017
dc.identifier10.1021/ac4035746
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/61364
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/61364
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1285950
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionTerahertz-time domain spectroscopy (THz-TDS) has the ability to probe the crystallinity of several materials, due to the interaction of THz radiation with optical phonons in crystal lattices. In this work, THz-TDS has been used to quantify the degree of crystallinity of microcrystalline cellulose (MCC) samples. The THz spectra of cellulose present absorption features which could be directly correlated with the crystallinity index (CI) obtained by means of the well-established powder X-ray diffraction (PXRD) technique. The effect of THz time-domain signal processing was investigated, and both univariate and multivariate, based on partial least-squares (PLS), regressions were carried out with the signal in the frequency domain to correlate the THz spectra with Cl. Results show that the multivariate regression models based on spectral data, collected with the sample displaced from the focal plane of the THz optics to improve representativeness and measurement repeatability, present the best performance with external validation achieving an absolute root-mean-square error of prediction (RMSEP) of 4% for CI. This result compares well with the PXRD technique.
dc.description86
dc.description8
dc.description3780
dc.description3786
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFAPESP [2013/00502-6]
dc.languageen
dc.publisherAmer Chemical Soc
dc.publisherWashington
dc.publisherEUA
dc.relationAnalytical Chemistry
dc.relationAnal. Chem.
dc.rightsfechado
dc.sourceWeb of Science
dc.subjectSilicified Microcrystalline Cellulose
dc.subjectMechanical-properties
dc.subjectNative Cellulose
dc.subjectTransformation
dc.subjectTablets
dc.subjectImpact
dc.subjectIndex
dc.subjectWater
dc.subjectRaman
dc.titleDetermination of Cellulose Crystallinity by Terahertz-Time Domain Spectroscopy
dc.typeArtículos de revistas


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