Characterization of Micro Fibrillated Cellulose using fluorescence microscopy : Evaluation of pretreatments of Micro Fibrillated Cellulose using fluorescence microscopy

• The paper making process is well known but the underlying mechanisms are not fully understood. Paper builds up from cellulose fibers and many additives are needed in the process. The interactions between components in the furnish are important. Pulp fibers have a wide size distribution and the finest particle fraction is called fines. The fines used in this study are Micro Fibrillated Cellulose (MFC) from bleached craft pulp.   A model system containing fibers and latex was used together with fluorescence microscopy and image analysis. By studying the motion of a labeled latex particle more can be understood about the internal structure of the system. The system consists of: A water suspension of MFC. At the concentrations used the fines are interacting with each other, forming a gel like structure. Negatively charged labeled latex particles (probes), with radius 0,1 µm. Two types of electrolytes (NaCl and CaCl2). The electrolytes were used for altering the electrical double layer of the charged surfaces in the system. Different pretreatments of the MFC has been investigated and evaluated using the movements of the probe in the network of fibers.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Nyckelord

Fluorescence microscopy

image analysis

diffusion coefficient

Chemistry

Kemi

Kemiteknik

Chemical Engineering

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