25 documents found, page 1 of 3

Improvement of bagasse fiber–cement composites by addition of bacterial nanocel...

The design of green fiber-reinforced nanocomposites with enhanced properties and dura bility has attracted attention from scientists. The present study aims to investigate the potential of bacterial nanocellulose (BNC) as a green additive for fiber–cement composites. Inverse gas chromatography (IGC) was used to evaluate the influence of incorpo ration of BNC as powder or gel, or coated onto the bagasse fibers, ...

Fish larval performance fed with copepods (Acartia grani) and the dinoflagellat...

Monitoring surface properties evolution of thermochemically modified cellulose ...

The effect of steam explosion coupled with chemical treatment, on the surface properties of banana fibres obtained from the pseudo-stem of banana plant Musa sapientum was studied in detail by inverse gas chromatography (IGC). IGC experiments were performed in banana fibres from macro to nano stages at 293, 298 and 303 K. The analyzed fibres showed dispersive component of the surface energy between 39.59 and 48....

Investigation of surface properties of physico-chemically modified natural fibr...

Inverse gas chromatography (IGC) is a suitable method to determine surface energy of natural fibres when compared to wetting techniques. In the present study, the surface properties of raw and modified lignocellulosic fibres have been investigated by IGC. The fibres chosen for the study were flax, hemp, kenaf, agave, agave hybrid, sisal and pineapple. The treatments used were 4% NaOH and 2% zein. The uniqueness...

Natural fibers characterization by inverse gas chromatography

Vegetable fibers can be considered as naturally occurring composites, consistingmainly of cellulose, lignin and hemicellulose. Their properties are significantly affected by many factors such as variety, climate, harvesting and maturity, among others. Thus, prior to their application, the fibers should be properly characterized. In the present study, inverse gas chromatography was used to study the surface prop...

Supply of crab larvae to an estuary in the eastern Atlantic upwelling system ex...

We measured variability in daily supply levels of shore crab megalopae in an estuary on the northwest Portuguese coast, Ria de Aveiro, located in the eastern Atlantic upwelling system. The 5 yr study covered the shore crab larval season (generally February to July) in 2002 and from 2006 to 2009. We addressed the possible effects of wind- and tide-driven circulation, number of flood hours during darkness, and ch...

Bentonite from Porto Santo Island, Madeira Archipelago: surface properties stud...

The present paper shows the importance of Inverse Gas Chromatography (IGC) for the determination of the surface properties of bentonites. These properties are dispersive surface energy, acid-base properties, surface heterogeneity, sorption isotherms, BET surface areas and heat of sorption, using different probe molecules. IGC can contribute to the interpretation, prediction and optimization of the studied mater...

Structural characterization of stalk lignin from banana plant

Dioxane lignins from two fractions of banana plant ‘Dwarf Cavendish’ stalk (floral stalk (DLFS) and rachis (DLR)) were structurally characterized by a set of spectroscopic (Ultravio let (UV), FTIR, solid- and liquid-state NMR) and chemical degradation (permanganate (PO) and nitrobenzene oxidation (NO)) techniques. Despite both lignins are of HGS-type, strong structural differences were observed between them. Th...

Structural characterization of stalk lignin from banana plant

Dioxane lignins from two fractions of banana plant 'Dwarf Cavendish' stalk (floral stalk (DL(FS)) and rachis (DL(R))) were structurally characterized by a set of spectroscopic (Ultraviolet (UV), FTIR, solid- and liquid-state NMR) and chemical degradation (permanganate (PC) and nitrobenzene oxidation (NO)) techniques. Despite both lignins are of HGS-type, strong structural differences were observed between them....

Chemical composition of different morphological parts from ‘Dwarf Cavendish’ ba...

The study on chemical composition and structure of components from different morphological parts of ‘Dwarf Cavendish’ banana plant (petioles/midrib, leaf blades, floral stalk, leaf sheaths and rachis) have been carried out aiming to evaluate their potential as eventual raw materials for the chemical processing. Macromolecular components were analysed using solid-state NMR, ATR-FTIR and wet chemistry methods. Mi...