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1
Content available Optical characteristics of Portulaca grandiflora-doped Cellulose using the spray pyrolysis technique
Alaridhee Tahseen, Obeed Mohammed T., Malk Fatima H., Dhahi Baheya A.
Opto-Electronics Review
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2023
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Vol. 31, No. 3
art. no. e146553
EN
Thin films were prepared based on cellulose polymer doped with different ratios of natural dye derived from Portulaca grandiflora concentrations. The polymer and natural dye were extracted from eco-friendly materials - the cell walls of millet husks and Portulaca grandiflora, respectively. The spray pyrolysis technique was applied to prepare thin film samples to control the film morphology and reduce the roughness of the surface. Optical microscope and Fourier transform infrared were used to analyse structural, morphological, and functional groups for all samples, respectively. The peak absorbance, extinction coefficient, optical bandgap, Urbach energy, and optical conductivity for the thin films were determined using ultraviolet-visible spectroscopy. The results show an enhancement in the optical characteristics when the natural cellulose is doped with a dye. Doping cellulose with 5% P. grandiflora has led to a considerable reduction in the energy bandgap (to 1.95 eV), compared to the sample doped with 1%.
2
Content available Study of Optical and Electrochemical Properties of Solvent-Dependent Natural Dye Extracted from Rivina humilis L
Aliah Hasniah, Iman Ryan N., Sriwidati Sriwidati, Sawitri Asti, Setiawan Andhy, Putri Assa P. D., Kurniawati Fera
Journal of Ecological Engineering
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2023
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Vol. 24, nr 9
312--321
EN
This work aimed to study the natural dye extracted from Indonesian wild plants (Rivina humilis L.) using different solvents. The natural dye was extracted using the maceration method. Three different solvents, namely, aquades, acetone, and ethanol 96%, were used to extract natural dye from Rivina humilis L fruit. The absorbance spectra of the extracted dye were recorded using Ultraviolet-Visible (UV-Vis) spectroscopy. The different spectra of betalain pigment revealed the dye extract’s dependence on the solvent. The functional groups of the extracted dye were analyzed using Fourier transform infrared (FTIR) spectroscopy. The adherence of carbonyl and hydroxyl groups from FTIR spectra indicated that this dye could anchor to a semiconducting material, e.g., TiO2, which was commonly used in dye-sensitized solar cells (DSSC). The electrochemical properties of the extracted pigments were studied through higher occupied molecular orbital (HOMO) and lower unoccupied molecular orbital (LUMO) energy levels. Based on the results, the best performance to construct DSSC was achieved by natural dye adsorption with aquades solvent.
3
Content available Herbal Extract-Induced Silver Nanoparticles for Antibacterial Cotton Fabric
Rajput Sanjeev Kumar, Singh Mukesh Kumar, Shakyawar Dinesh Babu
Fibres & Textiles in Eastern Europe
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2023
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Vol. 31, no. 3
22--29
EN
Herbal extract-induced metallic nanoparticles have replaced the traditionally synthesized nanoparticles to achieve sustainability in antimicrobial textiles. Silver nanoparticles (NPs) were created by the bio-reducion of silver nitrate with eucalyptus corymbia leaf extract. The bi-lateral activities of herbal extract, like the reduction and capping of silver nanoparticles, have added new dimensions in the bactericidal sector. Silver nanoparticles were characterized by UV-visible spectroscopy, a particle size analyzer, Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and X-ray diffractometry. In this study these biosynthesized nanoparticles were applied on cotton fabric alone and along with chitosan by the pad-dry-cure method to create antibacterial clothing. Antibacterial efficiency was characterized using the colony counting method (serial dilution method). The treated fabric shows excellent antibacterial efficiency.
4
Content available remote Blossoming Beauty: Enhancing Natural Fibres with Calendula Officinalis L. Flower Dye and Assessing Color Fastness with Microbial Properties
Mariselvam R., Ranjitsingh A. J. A., Mideen Ponani Kaja, Manoharadas Salim, Krishnamoorthy Rajapandiyan, Alshuniaber Mohammad A
Fibres & Textiles in Eastern Europe
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2023
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Vol. 31, no. 4
30--37
EN
Mordants are materials used to fix long periods of colour on selected fabrics or fibres. The current research aimed to dye natural fibres like palm leaf (Borassus flabellifer L.), korai grass (Cyperus pangorei L.), banana fibre (Musa accuminata L.), screw fine fibre (Pandanus), sisal fibre (Agave sisalana Perrine), and pineapple fibres (Ananas comosus L.) with Calendula officinalis plant flower dye. The dye was fixed to the selected fibre material with the help of different mordants. The Calendula officinalis flower dye produced different colours, like black, brown, orange, sandal, yellow, etc., on the dyed materials. The different colour formations on the dyed materials are based on the mordents used to fix the dye. The mordants tonify the different colours in the same dyestuff of Calendula officinalis flower dye. Mordant-based dyed natural fibres have good fastness properties against light and water. Calendula officinalis dyes have potential activity against the skin infection-causing organism Pseudomonas aeruginosa.
5
Content available Determination of astaxanthin and canthaxanthin in food products by HPLC method
Krępska Małgorzata, Sieczyńska Katarzyna, Lasoń-Rydel Magdalena
Technologia i Jakość Wyrobów
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2022
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R. 67
106--116
EN
Astaxanthin and canthaxanthin are carotenoids produced mainly by algae, fungi and bacteria. These dyes give the characteristic pink-orange color to salmon, shrimp and flamingo feathers. In the case of farm animals, astaxanthin and canthaxanthin are added to the feed, and their amount is strictly established and should not exceed certain limits. The article presents a method of determination of astaxanthin and canthaxanthin by HPLC method. This analysis determines whether these dyes are detected in the product and what their content are. This makes it possible to assess compliance with the limits and often also to determine the origin of the product.
PL
Astaksantyna i kantaksantyna to karotenoidy wytwarzane głównie przez algi, grzyby i bakterie. Barwniki te nadają charakterystyczny różowo-pomarańczowy kolor piórom łososi, krewetek i flamingów. W przypadku zwierząt gospodarskich astaksantyna i kantaksantyna są dodawane do paszy, a ich ilość jest ściśle określona i nie powinna przekraczać określonych limitów. W artykule przedstawiono metodę oznaczania astaksantyny i kantaksantyny metodą HPLC. Ta analiza określa, czy barwniki te są wykrywane w produkcie i jaka jest ich zawartość. Pozwala to ocenić przestrzeganie limitów, a często także określić pochodzenie produktu.
6
Content available Use of natural dyes for the fabrication of dye-sensitized solar cell: a review
Bhargava Cherry, Sharma Pardeep Kumar
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2021
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Vol. 69, nr 6
art. no. e139319
EN
The increasing concern for worldwide energy production is the result of global industrialization and decreasing energy resources. Despite the cost factor, solar energy continues to become more popular due to its long-term nature as a resource and growing conversion efficiency. A dye-sensitized solar cell converts visible light into electricity. The efficient use of dye as a sensitizer is the critical factor in enhancing the performance of the dye-sensitized solar cell. Natural dyes are found in abundance in leaves, flower petals, roots, and other natural resources. Due to the advantages of natural dyes such as cost-effectiveness, the simpler extraction process, and being environmentally friendly, etc., researchers are working extensively to replace synthetic dyes with natural ones. This paper highlights the various types of natural dyes and their effect on the efficiency of the dye-sensitized solar cell.
7
Content available remote Microwave assisted biosynthesis of rice shaped ZnO nanoparticles using Amorphophallus konjac tuber extract and its application in dye sensitized solar cells
Kumar P. N., Sakthivel K., Balasubramanian V.
Materials Science Poland
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2017
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Vol. 35, No. 1
111--119
EN
Rice shaped ZnO nanoparticles have been synthesized for the first time by a biological process using Amorphophallus konjac tuber extract and used as a photoanode in a dye sensitized solar cell. The glucomannan present in aqueous tuber extract acted as a reducing agent in the synthesis process, further it also acted as a template which modified and controlled the shape of the nanoparticles. The synthesized nanoparticles were dried by microwave irradiation followed by annealing at 400 °C. The FESEM and TEM images confirmed that the synthesized ZnO nanoparticles had rice shaped morphology. Furthermore, the X-ray diffraction studies revealed that the prepared ZnO nanoparticles exhibited wurtzite phase with average particle size of 17.9 nm. The UV-Vis spectroscopy studies confirmed the value of band gap energy of biosynthesized ZnO nanoparticles as 3.11 eV. The photoelectrodes for dye sensitized solar cells were prepared with the biosynthesized ZnO nanoparticles using doctor blade method. The photoelectrode was sensitized using the fruit extract of Terminalia catappa, flower extracts of Callistemon citrinus and leaf extracts of Euphorbia pulcherrima. The dye sensitized solar cells were fabricated using the sensitized photoelectrode and their open circuit voltages and short circuit current densities were found to be in the range of 0.45 V to 0.55 V and 5.6 mA/cm2 to 6.8 mA/cm2, respectively. Thus, the photovoltaic performances of all the natural dye sensitized ZnO solar cells show better conversion efficiencies due to the morphology and preparation technique.
8
Identyfikacja naturalnych substancji barwiących obecnych w farbach malarskich pochodzenia historycznego
Otłowska O., Śliwka-Kaszyńska M., Kołodziejczyk A.
Analityka : nauka i praktyka
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2015
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nr 2
52--55
PL
Naturalne barwiniki organiczne są komponentami wielu obiektów dziedzictwa kulturowego. Identyfikacja substancji barwiących obecnych w farbach historycznych dostarcza istotnych informacji dla szerokiego grona specjalistów zajmujących się dziełami sztuki.
9
Content available remote Dyeing, fastness, and UV protection properties of silk and wool fabrics dyed with eucalyptus leaf extract by the exhaustion process
Mongkholrattanasit R., Krystufek J., Wiener J., Vikova M.
Fibres & Textiles in Eastern Europe
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2011
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Vol. 19, no. 3 (86)
94-99
EN
This research was concerned with dye extraction from the leaves of eucalyptus and with the application of this dye for silk and wool fabric dyeing by the exhaustion process. Optimal results were achieved when dyeing at 90 °C for 40 minutes and at pH 4. Silk and wool fabrics dyed in a solution composed of eucalyptus extract from leaves in combination with a mordant compound showed a shade of yellowish-brown. An exception was when the fabrics were dyed with FeSO4 mordant, resulting in a shade of dark grayish-brown. The colour fastness to light and rubbing after dyeing the silk and wool fabrics treated with the mordant was investigated, the results of which showed fair to good fastness, whereas the colour fastness to washing was at a good to very good level. The results confirmed that natural dyes from eucalyptus leaf extract have potential applications for fabric dyeing and producing ultraviolet (UV) protective silk and wool fabrics.
PL
Badano barwienie jedwabiu i wełny ekstraktem z liści eukaliptusowych. Optymalne wyniki uzyskano barwiąc w temperaturze 90 °C przez 40 minut przy pH 4. Przy zastosowaniu odpowiedniej zaprawy uzyskiwano odcień żółtobrązowy, za wyjątkiem zastosowania zaprawy z FeSO4, kiedy to uzyskano ciemny odcień szarobrązowy. Badano trwałość barwnika i stwierdzono średnią lub dobrą trwałość, odporność na pranie natomiast była dobra lub bardzo dobra. W efekcie stwierdzono potencjalną przydatność praktyczną badanego barwnika.
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