Abstract
A new Raman microscopy approach was developed to analyze the starch
distribution of paper cross-sections in a faster and more specific way than is
possible with the currently used iodine-staining method. Raman images were
recorded and analyzed from cross-sections of cellulose hand sheets surface-sized
with 1% or 2% starch solutions and with different film thicknesses. In addition,
Raman imaging analysis of the starch distribution was performed on two
industrial papers, an abrasive base paper and a surface-sized recycling paper.
The visualization and the quantitative analysis of the starch distribution were
performed by using the intensity changes of the Raman starch band at 855
cm<sup>-1</sup> and by principal component analysis. Distribution curves
were calculated from the intensity data and compared for the samples with
different starch concentrations and with results obtained from iodine-stained
cross-sections of the same samples. The results of this study demonstrate the
great potential and the new possibilities of Raman microscopy for studying the
z-distribution of chemical components and additives in paper.
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