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Title
Morphological and surface aspects of cellulose-lignin hydrogels
Authors
DIANA CIOLACU FLORICA DOROFTEI GEORGETA CAZACU and MARIA CAZACU
Received
September 24, 2012
Published
Volume 47 Issue 5-6 May-June
Keywords
cellulose-lignin hydrogel, dynamic water vapor sorption, X-ray diffraction, optical microscopy, scanning
electron microscopy, structural characterization
Abstract
Cellulose-lignin hydrogels (CL), prepared by a two-step procedure consisting in dissolving the cellulose in an alkaline
solution at low temperature, followed by the crosslinking reaction with lignin in the presence of epichlorohydrin, were
subjected to experimental approaches, additional to those reported before, for their in-depth characterization. Thus, the
morphology was examined by optical and scanning electron microscopy (SEM), while some surface properties (surface
area, average pore size, and sorption capacity) were estimated by dynamic water vapor sorption (DVS) analysis. The
changes in crystalline structure of the samples were confirmed by X-ray diffractometry (XRD). It has been found that
these characteristics are influenced by the lignin whose presence leads to increased porosity of the material.
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