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Production of Spindle Palm Petiole Fiber Reinforced High Density Polyethyele Composites

100%
Nneka E. L., Monday O., Nnaemeka O. B., Uzoma E. R.
World News of Natural Sciences
|
2021
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vol. 38
98-119
EN
The work is on the production of spindle palm petiole fiber reinforced high density polyethylene (HDPE) composites. The Spindle Palm Petiole Fiber (SPPF) and HDPE composites were produced using injection molding machine. SPPF were characterized to determine their chemical compositions. Central Composite Design (CCD) was applied as an optimization tool of RSM for cellulose and tensile strength. The chemical composition of the SPPF is cellulose (65%), hemicelluloses (17.1%) and lignin (14.1%). Surface modifications of the fiber enhanced the properties of the fiber. Quadratic model adequately described the relationship between percentage cellulose yield and variables: chemical concentration, mass/volume ratio and time. The cellulose content at optimal level is 60.3% at 3.5wt% concentration, 4g/l mass/volume ratio and time of 16hr. Also for the composite, the quadratic model described the relationship between tensile strength and temperature, fiber/polymer ratio and time. The optimum tensile strength of 42.0 Mpa was obtained at fiber/polymer ratio of 29wt%, temperature of 172 °C and time of 10 min. Water absorbed by the untreated fiber was high compared to the chemically treated fiber. The chemical treatment created a better interfacial bonding of SPPF/HDPE and this could be responsible for the observations.
2
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MICROEMULSIONS AS CARRIERS OF OMEGA-3 POLYUNSATURATED FATTY ACIDS

100%
GÓRSKA A., KRUPA A.
Medicina Internacia Revuo
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2013
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vol. 25
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issue 101
211- 219
EN
Design of novel foodstuffs rich in natural bioactive substances is one of the main research field in the food industry. There are many clinical reports on beneficial effects of either docosahexaenoic acid (DHA) or eicosapentaenoic acid (EPA) on health. In general n-3 polyunsaturated fatty acids (n-3 PUFAs) are significant structural components of cell membranes. Since DHA and EPA represent exogenous fatty acids, their level in the human body depends on the dietary intake. Therefore there is a need to enrich food by bioactive compounds. It has been shown that the application of polyunsaturated fatty acids such as α-linolenic acid in traditional foodstuffs permits to obtain a kind of functional food that can be used to improve both health and skin condition. However low stability of natural bioactive components limits their application in food, especially on an industrial scale. Due to this fact efforts are made to prepare new functional food formula containing n-3 PUFAs in a stable form. Microencapsulation process is a well known attempt to prevent their oxidation. Preparation of food-grade microemulsions containing polyunsaturated fatty acids to improve the stability and to ensure pleasant sensory properties of food is discussed in the present study.
3
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Fabrication and Comparison Performance of Dye-Sensitized Solar Cells Based on Single and Cocktail Natural Dyes

100%
Clement H. N., Gupta S., Tsoken G.
World News of Natural Sciences
|
2024
|
vol. 53
94-107
EN
ABSTRACT Three natural dyes were used in the fabrication of Dye Sensitized Solar Cells (DSSCs): anthocyanin dye from pride of barbados flower and chlorophyll dyes from masquerade tree leaf and pumpkin leaf dye extracts. The chlorophyll and anthocyanin dyes were hybridized in a cocktail in ratio 1:1 by volume. The purpose of the research is to fabricate enhanced DSSCs based on natural dye at low cost.The photoanode was fabricated using P25 TiO2 powder coated on the fluorine doped tin oxide (FTO) conducting surface, using spin coating technique to form a thin film. The experimental results for single dye using masquerade tree leaf (A), pumpkin leaf (B) and pride of barbados flower (C) yield power conversion efficiencies (PCEs) of 0.45%, 0.72% and 1.21%, respectively. Also, the DSSCs based on blended dyes in a cocktail show that the PCE of 0.97%, 1.09% and 0.098% for masquerade tree leaf and pumpkin leaf (AB), masquerade tree leaf and pride of barbados flower (AC) and pumpkin leaf and pride of barbados flower (BC), respectively. The results show that pride of barbados flower (C) dye based DSSC has the highest PCE of 1.21% with an open-circuit voltage (𝑉oc) of 0.85 V, short-circuit current density (Jsc) of 3.59 mA/cm2 and fill factor (FF) of 39.54%.
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