Cassava

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Cassava (Manihot esculenta Crantz), also named yuca, is a perennial woody shrub with tuberous roots in the family Euphorbiaceae. Cassava is now widely cultivated in tropical and subtropical regions of Asia, Africa, and Latin. The world production of cassava in 2012 was estimated as tonnes with the top producers being Nigeria, Indonesia, Brazil, and Thailand (FAO, 1994). Being very rich in starch (90% of the dry matter), Cassava is mainly used in traditional human foods, but is also used industrially for the production of starch and starch derivatives, e.g. dextrins and glucose (Zhu, 2015).
Polypyrrole can be prepared either by chemical or electrochemical polymerization. In the electrochemical polymerization, the pyrrole (Py) is oxidized by …show more content…

The used electrodes were stainless steel plates 4 cm2 area (2x2). The reference electrode was saturated calomel (KCl). The cathode of each accumulator was synthesized using p-toluenesulfonic acid (PTS) as a dopant, in which solutions of pyrrole (Py) / pTS 0.1 mol / L were prepared. Material obtained is polarized with 0.1 mol / L LiClO4 solution also by chronoamperometry using a potential of 0.5 V and 600 s. Accumulator anode was synthesized using in this case indigo carmine (IC), in solutions 0.1 mol / L of p / IC. After the film was polarized with LiClO4 0.1 mol / L solution using a potential -1.3 V. After being prepared, movies ppy / pTS and ppy / IC are attached to biopolymers and separated by a piece of recyclable paper from the same area.

2.3. Experimental design
The purpose of this work is to understand the influence of different mixtures of raw coal, corn cob and binder solution over the heat value and sulfur content in the briquette combustion emissions. Based on this, it was carried out experimental conditions for synthesis and develop of electrical properties of electrochemical accumulators.

Based in Table 1 we realize a multi-objective optimization, in order to obtain the best chemical compositions for cassava starch biopolymers, which allow producing electrochemical accumulators with higher electrical …show more content…

Accumulator specific charge using composition 1 (no addition of lithium perchlorate) shows an optimal range of 0.3 – 0.5 mm thickness and 50-55 % of relative humidity, in the same way, this behavior was observed for accumulator specific capacity. In case of accumulator specific energy and specific power, optimal range of thickness and relative humidity were 0.3 mm and 50-55 % respectively. For this composition of biopolymers, it is clear that electrical properties of these accumulators are due to ppy/pTS and ppy/IC synthesized electrochemically.

Electrical properties for electrochemical accumulators assembled using cassava starch biopolymers with chemical composition 2 are shown in Figure 2. For accumulator charge capacity and specific charge, it is necessary to obtain 1.3-1.5 mm biopolymers thickness as well as 50-55 % relative humidity. At this point, the effect of introduction of lithium perchlorate (1.5 g) could influence in thickness of cassava

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