The influence of crystalline structure of cellulose in chitosan-based biocomposites on removal of Ca(II), Mg(II), Fe(III) ion in aqueous solutions

AbstractIn this work, the influence of the supermolecular structure of cellulosic fillers in chitosan matrix on the process of adsorption of calcium, magnesium and iron metal ion was analyzed, while using techniques such as: X-ray diffraction, flame atomic absorption spectrometry, FTIR spectroscopy, particle size analysis, and wettability angle. It has been shown that polymorphic form of cellulose significantly affects its particle size. The introduction of cellulosic filler into polymer matrix was responsible for changes in the sorption efficiency of chitosan composites. It was found that materials with nanocellulose II were characterized with the highest efficiency of adsorption. This interesting relationship has not been reported in the literature, yet. It is important especially in terms of designing composite materials with high adsorption capacity. In the presented paper this issue was discussed, taking into account crystallographic aspects as well as changes in the hydrophilicity of the surface of composite materials. Composite materials were also subjected to mechanical tests which showed some interesting increase in tensile strength when compared to the unfilled polymer.

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Real-time Particle Size Analysis Using the Focused Beam Reflectance Measurement Probe for In Situ Fabrication of Polyacrylamide–Filler Composite Materials

Scientific Reports ◽

10.1038/s41598-019-46451-x ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 5

Author(s):

Sivashunmugam Sankaranarayanan ◽

Blaž Likozar ◽

Rodrigo Navia

Keyword(s):

Particle Size ◽

Composite Materials ◽

Real Time ◽

Particle Size Analysis ◽

Size Analysis ◽

Reflectance Measurement ◽

In Situ Fabrication ◽

Focused Beam

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Development and preparation of oxide mixture-based pigments for anticorrosion paints

Pigment & Resin Technology ◽

10.1108/prt-01-2016-0012 ◽

2017 ◽

Vol 46 (5) ◽

pp. 342-355 ◽

Cited By ~ 1

Author(s):

Petr Benda ◽

Andréa Kalendová

Keyword(s):

Particle Size ◽

Mechanical Tests ◽

Particle Size Analysis ◽

Size Analysis ◽

Coating Materials ◽

Pigment Volume Concentration ◽

Oxide Mixture ◽

Content Type ◽

Steel Panels ◽

Lamellar Zinc

Purpose The aim of the work is to develop an anticorrosion pigment based on an oxide mixture with lamellar particles. The pigments are prepared from lamellar zinc, zinc oxide and magnetite by calcination. An alkaline earth carbonate is added when embedding a third cation in the lattice of the ferrite that forms the envelope of the lamellar zinc. The properties of the pigments are tested both in the powdered state and when embedded in an epoxy-ester system using different pigment volume concentrations (PVC). Design/methodology/approach The properties of paints containing synthesised oxide mixture-based pigments at various volume concentrations and with the Q factor – Q = PVC/CPVC = 0.65 – were examined (where CPVC is critical pigment volume concentration). A series of isometric ferrite pigments were also synthesised for a comparison. Paints of both types with PVC = 10, 15 and 20 per cent were formulated. Steel panels coated with the paints were subjected to corrosion and mechanical tests. Findings The oxide mixtures with lamellar particles were subjected to particle size analysis and found to make up a broad distribution curve. Electron microscopy photographs confirmed that the oxide mixture pigments contained lamellar particles with a surface layer. A high anticorrosion effect was achieved owing to the combination of different oxide types. Research limitations/implications The properties of the oxide mixtures with lamellar particles are described. Their particle distribution curves can be obtained by particle size analysis methods with a view to obtaining additional information on the status and properties of the pigment particles that may be useful in the development of better paints/coating materials. Practical implications Oxide mixtures with lamellar particles can be used in paints protecting construction steel. Originality/value The composition of the prepared oxide mixture-based pigments is novel. Each oxide acts by its own anticorrosion mechanism and the final beneficial effect is due to their concerted action.

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