Relevant bibliographies by topics / Natural organic pigments and dyes

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Natural organic pigments and dyes'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Natural organic pigments and dyes"

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Palomino Agurto, Mardonio E., Sarath M. Vega Gutierrez, R. C. Van Court, Hsiou-Lien Chen, and Seri C. Robinson. "Oil-Based Fungal Pigment from Scytalidium cuboideum as a Textile Dye." Journal of Fungi 6, no. 2 (April 22, 2020): 53. http://dx.doi.org/10.3390/jof6020053.

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Identification of effective natural dyes with the potential for low environmental impact has been a recent focus of the textile industry. Pigments derived from spalting fungi have previously shown promise as textile dyes; however, their use has required numerous organic solvents with human health implications. This research explored the possibility of using linseed oil as a carrier for the pigment from Scytalidium cuboideum as a textile dye. Colored linseed oil effectively dyed a range of fabrics, with natural fibers showing better coloration. Scanning electron microscopy (SEM) revealed a pigment film over the fabric surface. While mechanical testing showed no strength loss in treated fabric, colorfastness tests showed significant changes in color in response to laundering and bleach exposure with variable effects across fabric varieties. SEM investigation confirmed differences in pigmented oil layer loss and showed variation in pigment crystal formation between fabric varieties. Heating of the pigmented oil layer was found to result in a bright, shiny fabric surface, which may have potential for naturally weatherproof garments.
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Grygar, T., Š. Kučková, D. Hradil, and J. Hradilová. "Electrochemical analysis of natural solid organic dyes and pigments." Journal of Solid State Electrochemistry 7, no. 10 (June 7, 2003): 706–13. http://dx.doi.org/10.1007/s10008-003-0380-1.

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Nemer, Georgio, Nicolas Louka, Eugène Vorobiev, Dominique Salameh, Jean-Marc Nicaud, Richard G. Maroun, and Mohamed Koubaa. "Mechanical Cell Disruption Technologies for the Extraction of Dyes and Pigments from Microorganisms: A Review." Fermentation 7, no. 1 (March 9, 2021): 36. http://dx.doi.org/10.3390/fermentation7010036.

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The production of pigments using single cell microorganisms is gaining traction as a sustainable alternative to conventional syntheses, which rely, in no negligible proportions, on petrochemicals. In addition to depending on petroleum, these syntheses involved the use of toxic organic solvents, which may be inadequately disposed of across a range of industries, thus compounding the deleterious effects of fossil fuel exploitation. Literature suggests that notable research efforts in the area of sustainable pigment production using single cell microorganisms are focused on the production of pigments coveted for their interesting qualities, which transcend their mere capacity to dye various fabrics both natural and synthetic. As interest in sustainable pigment biosynthesis grows, the need to devise effective and efficient cell disruption processes becomes more pressing given that the viability of pigment biosynthesis is not only dependent on microorganisms’ yield in terms of production, but also on researchers’ ability to recover them. This review chiefly reports findings as to mechanical cell disruption methods, used individually or in various combinations, and their aptitude to recover biosynthetic pigments.
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Dias, Sandra, Elisabete M. S. Castanheira, A. Gil Fortes, David M. Pereira, A. Rita O. Rodrigues, Regina Pereira, and M. Sameiro T. Gonçalves. "Application of Natural Pigments in Ordinary Cooked Ham." Molecules 25, no. 9 (May 10, 2020): 2241. http://dx.doi.org/10.3390/molecules25092241.

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The possibility of obtaining a carmine or pink color on ordinary cooked ham by applying natural dyes from three plant species, namely red radish (Raphanus sativus L.), hibiscus (Roselle sabdariffa L.) and red beetroot (Beta vulgaris L.), was investigated. The extracts were evaluated for the stability at physical-chemical parameters and subjected to cytotoxicity assays in the gastric cell line AGS Encapsulation of the extracts in soybean lecithin liposomes and maltodextrin microcapsules was performed. Lyophilized extracts before and after encapsulation in maltodextrin were applied in the formulation of ordinary cooked ham and used in a pilot scale of production. The color of cooked ham samples from different assays was evaluated visually and by colorimetry. The results suggest that the coloration of ordinary cooked ham obtained with extracts of red beetroot is very promising for future applications in this type of meat product.
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Wu, Shengtao, Jinliang Huang, Haishuai Cui, Tian Ye, Fang Hao, Wei Xiong, Pingle Liu, and He'an Luo. "Preparation of organic–inorganic hybrid methylene blue polymerized organosilane/sepiolite pigments with superhydrophobic and self-cleaning properties." Textile Research Journal 89, no. 19-20 (February 19, 2019): 4220–29. http://dx.doi.org/10.1177/0040517519829924.

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Inspired by the self-cleaning and water-repellent properties of the lotus leaf in the natural world, a kind of organic–inorganic hybrid pigment with superhydrophobic properties was prepared by adsorption of cationic methylene blue (MB) azo dyes onto acid-treated sepiolite (SEP), and then a superhydrophobic functional group of polymerized organosilanes (POSs) obtained from hexadecyltrimethoxysilane (HDTMS) and tetraethoxysilane (TEOS) was introduced onto the composite pigments (MB/SEP). The excellent chemical, thermal and optical stability of MB@POS/SEP are due to the shielding effect caused by the chemical inertness of the POS sheet. Furthermore, the superhydrophobic MB@POS/SEP pigments show an extraordinary self-cleaning property, which is similar to the waterproof property of the lotus leaf and spider web. The superhydrophobicity is strongly linked to their chemical composition and morphology, which can be adjusted by varying the concentration of HDTMS and TEOS. This kind of superhydrophobic pigment can be applied in various fields, such as ceramics, building and daily necessities.
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Ghazali, Salmah Mohd, Hasiah Salleh, Ahmad Nazri Dagang, Nik Aziz Nik Ali, Nurhayati Ishak, Nurul Huda Kamaruzaman, Mohd Sabri Mohd Ghazali, Mohd Norizam Md Daud, and Nora’aini Ali. "A Simplest, Cheapest and Most Efficienct Technique to Enhance the Performance of Solid State Dye-Sensitized Solar Cell: Deposition of Purple Seaweed as a Photosensitizer." Solid State Phenomena 301 (March 2020): 160–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.301.160.

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Solid state dye-sensitized solar cell (ss-DSSC) was developed to overcome the problem arise from electrolyte leakage in liquid state dye-sensitized solar cell. This work focused on the fabrication of ss-DSSC based on inorganic semiconductor of titania and organic conducting polymer of poly (3-hexylthiophene) (P3HT) and natural dyes from purple seaweed (PS dyes) via electrochemical, spin coating and dip coating method, respectively. The absorption spectrum and functional group of PS dyes were investigated using UV-Visible absorption spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy; respectively. Meanwhile, the effect of immersion time of PS dyes on performance of the device was studied via current density-voltage (J-V) characteristic. PS dye was absorbed in a wide range of solar spectrum in visible and near-IR region by chlorophyll a, phycocyanin and zeaxanthin pigments exists in the PS dyes. The present of carboxylic groups in PS dyes which bound to P3HT and formed P3HT-COOH enable the linkage to TiO2 surface which helps in the transfer of electrons from natural dyes to the conduction band of TiO2 film. The highest efficiency obtained was 1.44% at 10 minutes time of immersion. This concludes that PS dyes was a good photosensitizer and can be applied in ss-DSSC.
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Tsugkiev, B. G., M. K. Ailyarova, E. I. Rekhviashvili, S. A. Grevtsova, and M. Yu Kabulova. "DEVELOPMENT OF TECHNOLOGY FOR THE PRODUCTION OF DYE FROM THE INFLORESCENCES OF CALENDULA OFFICINALIS." Innovations and Food Safety, no. 4 (December 28, 2018): 22–25. http://dx.doi.org/10.31677/2311-0651-2018-0-4-22-25.

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The starting material for the production of natural dyes are mainly plants. Coloring substances are usually obtained from various parts of plants: flowers, berries, roots, leaves containing pigments, the color of which is due to the presence of compounds such as anthocyanins, carotenoids, chlorophyll, flavonoids, etc. The most promising plant from the point of view of obtaining a yellow colorant is a medicinal calendula (Calendula officinalis L). Coloring pigment is mainly in the epidermis of the corollas of flowers and belongs to the group of carotenoid dyes, giving a yellow color. Its content in the flowers of calendula depends on the variety and growing conditions. Inflorescences of calendula officinalis contain carotenoids 2.8 %, the organic acid is 7.8 %, tannins to 0.02 %, essential oil of 0.03 %, mucus 4 %, ascorbic acid was 4.2 %. The chemical composition of calendula flowers, allows them to be used for dye. A method of extracting coloring substances from the inflorescences of calendula is developed.
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Cao, Zhen Yu, Feng Zhao, and Xi Yan Li. "Applications of Dyes in Material Science Research." Materials Science Forum 575-578 (April 2008): 1451–54. http://dx.doi.org/10.4028/www.scientific.net/msf.575-578.1451.

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Dyes are colored organic compounds that are used to pigment fiber or other materials. Dyes are mainly calssified into natural and synthetic dyes in terms of the origin. Natural dyes include animal dyes, plant dyes and mineral dyes with such defects as incomplete chromatogram, inconvenient use and color fading, and thus have been gradually eliminated. In 1856, the 18-year-old young British scientist Perkin successfully invented the world's first synthetic dyes. He built his own factory and industrialized synthetic dye production. Over 100 years since then, dye industry has undergone rapid development, and by 2001 synthetic dyes already have been up to nearly 10,000 varieties. In 2004, the output of total dyes in the world has reached 900,000 tons. Synthetic dyes are used comprehensively, not only to dye synthetic fibers, but also natural fibesr, fur, leather and man-made fibers.
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Verma, Himani, Anita Rani, Manisha Gahlot, Alka Goel, and Anil Kumar Sharma. "Sustainable dyeing of wool fabric with Talaromyces purpurogenus." Journal of Applied and Natural Science 11, no. 4 (December 10, 2019): 796–801. http://dx.doi.org/10.31018/jans.v11i4.2179.

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Natural dyes had been used by human being since ancient times for colouring of various materials including textiles. These were replaced completely by synthetic dyes, continuous use of which created the problem of pollution and environmental degradation. With the development of green technology and increased awareness of sustainability, the use of non-allergic, non-toxic and eco-friendly natural dyes on textiles has become a matter of significant importance. Among the natural sources of colourants, microorganisms such as bacteria and fungi have gained interest in the field of textile coloration. In the present study, the pigment solution yielded from growth of Talaromyces purpurogenus sp. on organic waste was used for dyeing of wool fabric. Under the dyeing conditions i.e. 1:30 M:L ratio, pH 5, 80º C temperature and 45 minutes dyeing time, the percent absorption could reach 57 %, 32%, 36% and 49% respectively. The wool fabric samples dyed with the fungal dye exhibited very good to excellent washing and rubbing fastness properties. The colour pigment obtained from fungal thus offered an opportunity to reduce impact on plant resources for dye source exploration. So it can be concluded from the study that a natural fungal dye could help to sustain the environment and to minimize the over exploitation of natural resources.
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Yang, Gui Jun, Sen Rui Wang, Hong Lin, Gang Wang, Yong Chang Zhang, Feng Hao, and Hui Yuan Chen. "Photovoltaic Performance Optimization of Natural Trollius Sensitized Solar Cells." Key Engineering Materials 512-515 (June 2012): 1614–18. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.1614.

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Dye-sensitized solar cell is gradually becoming a strong competitor to Si-based solar cells, attracting much attention both from research and industry. Organic dyes used in dye-sensitized solar cells usually resemble dyes found in plants, fruits, and other natural products. In the present study, trollius pigment was extracted from a natural flower named trollius petals to serve as the sensitizer of the cells. UV-Vis absorption measurement revealed that the extracted pigment had a stronger absorbance under acid condition than that under basic condition. Devices were assembled with this trollius pigment, by systematically correlating the photovoltaic performance with the pH value of dye solution, film thickness and the sensitization time of the photoanode. The power conversion efficiency was increased by 37.9% when the pH of the dye solution was changed from alkaline (pH=9) to acidic (pH=4.3). The optimized efficiency of 0.254% was obtained when the film thickness was 13μm and the sensitization time was 3h under acidic condition.
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Dissertations / Theses on the topic "Natural organic pigments and dyes"

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Mcclure, Kathryn Raeburn. "Development of new extraction methods for analysis of natural and synthetic organic colourants from historical and artistic matrices." Master's thesis, Universidade de Évora, 2020. http://hdl.handle.net/10174/29168.

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Abstract: In this thesis, an innovative approach for the extraction and clean-up of natural and synthetic textile dyes based on a recently developed ammonia extraction protocol and a novel Dispersive Liquid-Liquid Microextraction (DLLME) is presented. The thesis builds upon recent research highlighting the benefits of the ammonia-based extraction protocol for efficient extraction and preservation of the glycosyl moieties present in some types of natural dyes. This state-of-the-art extraction technique requires the use of a clean-up step to purify and preconcentrate the dye molecules for analysis. This clean-up step has never before been investigated or developed, and current methods rely upon traditional Liquid-Liquid Extractions (LLE), which are not well suited to the very small quantities of materials available for the analysis of artefacts of cultural heritage. The novel DLLME protocol presented by this thesis was developed in order to improve the recovery of natural dyes for analysis, and is also the first clean-up protocol to be developed for the analysis of synthetic textile dyes from cultural heritage matrices. Whilst a clean-up system has never before been applied to synthetic dyes within cultural heritage, pre-concentration and pre-treatment protocols are frequently reported for analysis of the same type of dyes used in food colourants. For this reason, this research adapts a DLLME method from the analysis of edible products, and combines this with the state-of-the-art ammonia extraction method reported in literature. DLLME protocols for both natural and synthetic dyes were developed and optimised first on known analytical standards, considered representative of the possible structures of natural dyes and synthetic azoic acid dyes respectively. The extraction recoveries of a variety of disperser and extraction solvents were analysed using HPLC coupled with targeted mass spectrometry. The optimised conditions were then coupled with the ammonia based extraction to ensure coherence of the methods. The results showed significant improvements in the recovery of natural dye analytes compared to current methods, as well as increased precision and efficiency. For synthetic dyes, results showed adequate recovery of analytes and allowed the ammonia-based extraction method to be applied successfully for the first time. After optimisation, the protocol for synthetic dyes was applied successfully to 15 samples (11 fibres, 4 powders) of suspected azo dyes from the Azienda Coloranti Nazionali e Affini (ACNA) synthetic dye collection housed at Sapienza University of Rome’s Museum of Chemistry. The novel protocol was performed after preliminary Raman screening to obtain some introductory information about the unknown samples in the collection. After application of the novel protocol, the samples were identified through untargeted analysis by HPLC-HRMS.
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Li, Meihui. "A comprehensive study of natural organic dyes in historical mediterranean textil by liquid chromatography with photodiode array and mass spectrometric detection." Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/27739.

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Thesis involves an optimized chromatographic and spectroscopic study of textiles, dyed with natural organic dyestuffs, aiming at the identification of chromophore constituents and their possible degradation products. Liquid chromatography - mass spectrometry coupled with photodiode array detection has been applied for the samples’ analyses after the selective extraction of chromophores from the substrate. The under investigation natural organic dyes are those with a particular cultural value since they have been widely used for textiles staining in the Mediterranean region since Antiquity. Improved “Mild Acid Hydrolysis” with methanol/formic acid enabled the observation of intact organic dyes from the silk textiles, while a water/ACN solvent system has also been employed for the pre treatment of dyestuffs from both reference and silk samples, which has successfully preserved the chemical information of dye compounds in order to create a comprehensive database for the characterization of natural organic dyes in further studies. Moreover, three different chromatographic programs were applied and compared in LC-PDA-MS, and the best separation result from Program B has been employed to the analysis of the real samples from Turkish silk textiles created by a historical dyeing recipes, and a certain amount of effective information in terms of qualitative analysis has been clarified; Περίληψη: Η παρούσα διπλωματική εργασία αφορά την βελτιστοποιημένη χρωματογραφική και φασματοσκοπική μελέτη κλωστοϋφαντουργικών προϊόντων βαμμένων με φυσικές οργανικές χρωστικές, με στόχο την ταυτοποίηση των έγχρωμων συστατικών τους καθώς και πιθανών προϊόντων αποικοδόμησης τους. Οι υπό διερεύνηση φυσικές οργανικές χρωστικές είναι ιδιαίτερης πολιτιστικής αξίας, δεδομένου ότι έχουν χρησιμοποιηθεί ευρέως για την βαφή υφασμάτων στην περιοχή της Μεσογείου από την Αρχαιότητα. Για την εκχύλιση των έγχρωμων ενώσεων των φυσικών οργανικών χρωστικών από τα δείγματα αναφοράς καθώς και από τα ιστορικά δείγματα μεταξιού, εφαρμόστηκε μία ήπια μέθοδος εκχύλισης με σύστημα διαλυτών νερού/ACN σε λουτρό υπερήχων. Επιπλέον, για την απόσπαση των χρωστικών από τα ιστορικά δείγματα προηγήθηκε στάδιο προκατεργασίας με μίγμα μεθανόλης/μυρμηκικού οξέος και θέρμανση σε ήπιες συνθήκες. Η εφαρμογή ήπιων συνθηκών εκχύλισης επέτρεψε την απόσπαση των έγχρωμων ενώσεων των φυσικών οργανικών χρωστικών, διατηρώντας επιτυχώς το σύνολο των χημικών πληροφορίων που θα μας επέτρεπαν τον απόλυτο χαρακτηρισμό των φυσικών χρωστικών. Για την ανάλυση των δειγμάτων μετά την εκλεκτική εκχύλιση των έγχρωμων ενώσεων από τα υποστρώματα, εφαρμόστηκε η υγρή χρωματογραφία – φασματοσκοπία μάζας, LCMS. Συνολικά εφαρμόστηκαν και συγκρίθηκαν τρία διαφορετικά προγράμματα LCMS, εκ των οποίων τα καλύτερα αποτελέσματα διαχωρισμού και ταυτοποίησης επιτεύχθηκαν με το Πρόγραμμα Β. Το πρόγραμμα αυτό εφαρμόστηκε και για την ανάλυση των ιστορικών δειγμάτων από τουρκικά μεταξωτά υφάσματα, βαμμένα βάσει ιστορικών συνταγών βαφής.
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Ibrahim, Michael. "Polyaniline-Oxyde de Titane : un composite pour la récolte et le stockage d’énergie." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10330/document.

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Cette thèse est divisée en trois parties. La première traite la synthèse de la polyaniline (PANI), un polymère conducteur de trou, utilisé dans plusieurs applications. En variant les quantités du monomère et de l’oxydant tout en fixant leur rapport molaire à 1:1,25, et en ajoutant de l’oxyde de magnésium, des aiguilles et des nouvelles structures semblables aux échinides sont formées. Le mécanisme de formation des structures unidimensionnelles est expliqué à l’aide de la théorie des multicouches. La deuxième partie est consacrée à la fabrication des monocouches photovoltaïques à faible coût en se basant sur le principe de fonctionnement des cellules à pigment photosensible (en anglais DSSC, Dye-Sensitized Solar Cell). En 1991, Grätzel a réintroduit l’effet photo-électrochimique en développant la première DSSC, une des cellules solaire troisième génération, formée d’un film de TiO2 (photo-anode) pigmenté à l’aide d’un colorant et d’un électrolyte qui sert à régénérer le pigment oxydé. Malgré leur faible coût, les DSSCs font face à de nombreux problèmes tels que le coût élevé du pigment, la fuite de l’électrolyte, la sublimation du couple I-/I3- à travers I2, etc. Afin de résoudre ces problèmes, des monocouches photovoltaïques ont été développées. Des composites formés de PANI et TiO2 sont la base de ces dispositifs nouvelle génération. La polymérisation in-situ de l’aniline en présence des nanoparticules de TiO2 conduit à une forte interaction entre la PANI et les particules de TiO2 où une structure « core (TiO2)/shell (PANI) » existe dans le composite. Dans le dispositif photovoltaïque basé sur le composite PANI-TiO2, PANI est considérée comme pigment à la photo-anode et comme poly-électrolyte plus profondément dans le composite. En plus, des textiles fabriqués utilisant ces composites photo-génèrent une tension de 0,6 V et un courant de 1 A/m2 lorsque l’éthanol est injecté dans le dispositif. Une nouvelle architecture a été développée qui sert à améliorer la performance de la cellule et en même temps stocker l’énergie pour des utilisations ultérieures. La dernière partie est consacrée à la fabrication des DSSCs basées sur les pigments naturels. L’anthocyane, un pigment naturel halochromique responsable de la couleur rouge dans les plantes, a été extrait du chou rouge et utilisé pour pigmenter les films de TiO2. Cette propriété se traduit par la fabrication des DSSCs de différentes couleurs et comportement photovoltaïque. Avec un pH égal à 0, une Vco et une Jcc de 520 mV et 185 μA/cm2 sont respectivement obtenues prouvant la possibilité d’utiliser le chou rouge comme source de pigment à très faible coût des DSSCs
This thesis is divided in three parts. The first one deals with the synthesis of polyaniline (PANI), a hole conducting polymer, used in many applications. By varying the quantities of the monomer and the oxidant while fixing the molar ratio at 1:1.25, and by adding magnesium oxide, novel echinoid-like and PANI needles were formed. The formation mechanism of the 1D structures is explained using the multi-layer theory. The second section is devoted for the fabrication of low cost single-layered photovoltaic devices based on the working principle of dye-sensitized solar cells (DSSCs). In 1991, Grätzel reintroduced the photo-electrochemical effect by developing the first DSSC, one of the third generation solar cells, formed of a TiO2 film (photoanode) sensitized using a dye and an electrolyte regenerating the excited dye. Despite their low cost, DSSCs face many problems such as the high cost of the dye, leaking of the electrolyte, sublimation of the I-/I3- through I2, etc. To solve these problems a single layer photovoltaic device has been developed. Composites formed of PANI, and TiO2 are the basis of the new generation photovoltaics. The in-situ polymerization of aniline inside a titania solution results in a strong interaction between PANI and TiO2 particles where a core (TiO2)/shell (PANI) structure exists inside the composite. In the single-layered photovoltaic device based on PANI-TiO2 composite, PANI is considered as sensitizer at the photoanode and as polyelectrolyte deeper inside the composite layer. In addition, textiles fabricated using such composites generated a voltage of 0.6 V and a current of 1 A/m2 when ethanol is injected in the solar cell. A new architecture has been developed to enhance the performance of the device and at the same time to store the converted energy for later use. The final part is devoted to the fabrication of DSSCs based on natural dyes. Anthocyanin; a halochromic natural dye responsible for the red color in plants, extracted from red cabbage was used to sensitize TiO2 films. This property results in the fabrication of DSSCs with different colors and photovoltaic behavior. At a pH equal to 0, a Voc and Jsc of 520 mV and 185 μA/cm2 were respectively recorded proving the possibility of using red cabbages as a very low cost dye source for DSSCs
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Stýblová, Marie. "Analýza přírodních organických barviv a pigmentů pomocí hmotnostní spektrometrie." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-304086.

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This thesis named "Analysis of natural organic dyes and pigments by mass spectrometry" investigates the identification of selected natural organic dyes and pigments by qualitative Laser Desorption/Ionisation - Time of Flight Mass Spectrometry analysis (LDI-TOF MS). The advantage of LDI-TOF MS method is its quick and reliable identification of low molecular weight material without preparatory chemical or time-consuming modification of samples. This method can be used for the analysis of works of art or for verifying their authenticity thanks to requiring only a little amount of sample. The LDI-TOF MS was tested on 19 organic dyes and pigments (e.g. alizarin, apigenin, baicalein, flavone, xanthone, tannic acid), four exemplarily prepared lakes (alizarin, purpurin, chrysin a quercetin lakes) and lakes mixed with organic binding media. The method was also successfully applied to two samples of blue color that were taken from Josef Čapek's painting called 'Procházka' (The Walk), that was dating back to 1936.
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Wang, Jinlong. "Phenylene homologs of benzidine mutagenicity and use in the synthesis of organic dyes and pigments /." 2004. http://www.lib.ncsu.edu/theses/available/etd-04202004-153454/unrestricted/etd.pdf.

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Pinto, Ana Lúcia Moreira. "Light harvesting in solar cells using natural pigments from red fruits adsorbed to mesoporous TiO2." Master's thesis, 2015. http://hdl.handle.net/10362/16026.

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Nature has developed strategies to present us with a wide variety of colours, from the green of leaves to the bright colours seen in flowers. Anthocyanins are between these natural pigments that are responsible for the great diversity of colours seen in flowers and fruits. Anthocyanins have been used to sensitize titanium dioxide (TiO2) in Dye-Sensitized Solar Cells (DSSCs). DSSCs have become one of the most popular research topic in photovoltaic cells due to their low production costs when compared to other alternatives. DSSCs are inspired in what happens in nature during photosynthesis. A primary charge separation is achieved by means of a photoexcited dye capable of performing the electron injection into the conduction band of a wide band-gap semiconductor, usually TiO2. With this work we aimed to synthesize a novel mesoporous TiO2 structure as the semiconductor in order to increase the dye loading. We used natural occurring dyes such as anthocyanins and their synthetic flavylium relatives, as an alternative to the widely used metal complexes of Ru(II) which are expensive and are environmentally unsafe. This offers not only the chance to use safer dyes for DSSCs, but also to take profit of waste biological products, such as wine and olive oil production residues that are heavily loaded with anthocyanin dyes. We also performed a photodegradation study using TiO2 as the catalyst to degrade dye contaminants, such as those from the wine production waste, by photo-irradiation of the system in the visible region of the light spectrum. We were able to succeed in the synthesis of mesoporous TiO2 both powder and thin film, with a high capacity to load a large amount of dye. We proved the concept of photodegradation using TiO2 as catalyst. And finally, we show that wine production waste is a possible dye source to DSSCs application.
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Cho, Kuo-Hsiung, and 卓國雄. "Fabrication and Characteristic Study of DSSC on Glass Substrate Coated with FTO by Using Natural and Organic Synthesis(N719) Dyes." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/00465080069302631978.

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碩士
中華大學
機械工程學系碩士班
101
The dye-sensitized solar cells (DSSC) in this research are coated with FTO transparent conductive film on the glass substrate. The photo voltaic performance of several DSSCs with different natural dyes and synthetic dye (such as N719) are studied. The first step of making DSSC is to deposit a layer of TiO2 as the electrode. Then soak the electrode into a liquid containing natural dye and N719 for several hours. After drying the electrode with air gun and use platinum as the counter electrode, the final one is to fill the electrolytic solution into the cell and then sealing for performance testing. Besides, this research took several extraction methods of natural dye into consideration. Firstly, grinding and dip the dyes into acetone, the next is ultrasonic oscillation or heating to extract the dye. Finally, plotting the IV curves and comparing the maximum conversion performances by using natural and synthetic dyes. One can see that the conversion efficiency by using synthetic dyes is better than those obtained by natural dyes. Moreover, the combinations by connecting the solar cells in series or in parallel are also studied; note that the parallel connection method can give a larger power conversion with a solar simulator at the same power irradiation.
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Carlos, Carlota Pereira de Almeida. "Advanced optical spectroscopy of new materials for luminescent solar concentrators." Master's thesis, 2019. http://hdl.handle.net/10773/29191.

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The transition from the current energy matrix towards an environmentally friendly and a ordable energy sources is a crucial challenge of the 21st century. Fully energetically sustainable architecture is a strategic focus in this e ort, through the realisation of so-called net-zero energy buildings. This implies an increase in the use of renewable resources, such as the wind, tides and the sun. Hence, new technologies that integrate solar-harvesting devices into existing and newly constructed buildings are of growing relevance. Luminescent solar concentrators consist of a transparent matrix doped or coated with active optical centres that absorb the incident solar radiation, which is reemitted at a speci c wavelength and transferred by total internal re ection to the edges, where photovoltaic cells are located. This con guration enables photovoltaic devices to be embedded in building facades or windows, allowing them to be transformed into energy harvesting units. Challenges for the luminescent species in luminescent solar concentrators include the use of sustainable, natural-based organic molecules. In this scope, semitransparent amine-functionalized organic{inorganic hybrids (ureasils) incorporating two di erent natural-based organic dyes, chlorophyll and enhanced uorescent protein (eGFP), were synthesised and processed as thin lms and monoliths. The natural dyes' and organic-inorganic hybrid's excited state dynamics were studied and characterised { the absorption bands of chlorophyll a and eGFP were identi ed, as well as their characteristic emission in the red/NIR (600-750 nm) and visible (450-600 nm) spectral regions, respectively. The emission properties were further quanti ed through absolute emission quantum yield measurements, with the maximum values measured for the eGFP-doped di-ureasil hybrid (0:33 0:03) being two times higher than the maximum value found for the chlorophyll-doped hybrid samples (0:15 0:02). Fluorescent lifetime analysis was also performed resorting to two di erent techniques: time-correlated single photon counting and spectrally-resolved streak imaging, yielding uorescent emission lifetimes of 5 ns for chlorophyll and 2-3 ns for enhanced green uorescent protein, in solution and when incorporated into the hybrid hosts. Further analysis was carried out by tting a two exponential decay model to the uorescent decay curves of the for the green uorescent protein samples, considering that two distinct electronic states are responsible for the absorption around 488 nm and the emission at 510 nm. Based on the intriguing photoluminescent features of the dye-based samples, two prototypes of luminescent solar concentrators were fabricated and optically characterised. In particular, a liquid planar luminescent solar concentrator based on a glass container lled with eGFP dispersed in an aqueous solution and a eGFPdoped di-ureasil hybrid bulk planar luminescent solar concentrator. The devices were coupled to a silicon-based commercial PV device, revealing maximum optical conversion e ciencies of 2:99 0:01% (liquid) and 3:70 0:06% (bulk), illustrating the potential of this approach for the development of nature-based luminescent solar concentrators, meeting the requirements of reliable, sustainable and competitive energy systems.
A transição da matriz energética atual para fontes de energia competitivas de baixo impacto ambiental é uma problemática central no século XXI. A arquitetura energeticamente sustentável é um ponto estratégico nesse esforço, através da realização dos chamados edifícios de energia zero. Por defenição, estes edifícios fazem uso de sistemas de produção de energia renovável local, como por exemplo a fotovoltaica, para satisfazer as suas necessidades energéticas. Assim, novas tecnologias que integrem dispositivos de coleção de energia solar em edifícios existentes ou recémconstruídos são de crescente relevância. Os concentradores solares luminescentes são dispositivos compostos por uma matriz transparente com centros óticos ativos incorporados. Estes absorbem a radiação incidente, que é posteriormente reemitida com um comprimento de onda específico e transportada por reflexão interna total até à célula fotovoltaica localizada nas extremidades da matriz. Esta configuração permite a produção de dispositivos fotovoltaicos incorporados em fachadas de edifícios e janelas, permitindo que estes sejam transformados em unidades de produção de energia. Atualmente, um dos desafios na áreas dos concentradores solares luminescentes é a incorporação de moléculas orgânicas naturais como centros óticos. Neste âmbito, foram fabricados e processados híbridos orgânico-inorgânicos semitransparentes, denominados por ureiasils, modificados por dois corantes orgânicos naturais, clorofila e proteína verde fluorescente (eGFP). A dinâmica entre os estados excitados dos corantes naturais e da matriz híbrida foi estudada e caracterizada - foram identifícadas as bandas de absorção da clorofila a e da eGFP, assim como a sua emissão característica no vermelho/infravermelho próximo (600-750 nm) e na região do visível (450-600 nm), respetivamente. As propriedades de emissão foram quantificadas através de medidas de rendimento quântico absoluto, registando-se um valor máximo para o híbrido com eGFP incorporada (0,33+/-0,03) duas vezes superior ao encontrado para as matrizes híbridas dopadas com clorofila (0,15+/-0,02). Foram também analisados os tempos de vida dos emissão dos estados excitados das várias amostras, tendo sido encontrados valores ~5 ns para a clorofila e ~2-3 ns para a eGFP, em solução ou quando incorporadas nas matrizes híbridas. Procedeu-se ainda a uma análise mais aprofundada no caso das amostras com eGFP, através da aplicação de um modelo bi-exponencial às curvas de decaimento, uma vez que o modelo eletrónico da mesma indica a presença de dois estados excitados distintos responsáveis pela absorção em torno dos 488 nm e emissão a 510 nm. Devido às características fotoluminescentes interessantes das amostras à base de corantes naturais para aplicações em concentradores solares luminescentes, foram fabricados e caracterizados dois protótipos com geometria planar { um concentrador solar luminescente baseado num recipiente de vidro cheio com eGFP em solução aquosa, e um outro concentrador que consistia num monolito da matriz híbrida dopada com eGFP. Os dispositivos foram acoplados a uma célula fotovoltaica comercial de silício, revelando eficiências óticas de conversão máximas de 2; 99+/-0; 01% e 3; 70+/-0; 06%, respetivamente, ilustrando o potencial desta abordagem para o desenvolvimento de sistemas energéticos sustentáveis e competitivos.
Mestrado em Engenharia Física
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Books on the topic "Natural organic pigments and dyes"

1

Ita, Paul A., and Aaron Hackle. World dyes & organic pigments. Cleveland: Freedonia Group, 2000.

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Hayes, Teresa L., Wendy F. Marley, and Rebecca L. Friedman. Dyes & organic pigments industry. Cleveland: Freedonia Group, 1999.

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Petrone, Susan, and Mary F. Babington. Private companies in the dyes & pigments industry: Dyes, organic pigments & inorganic pigments. Cleveland, OH: Freedonia Group, Inc., 1998.

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Liquid chromatography of natural pigments and synthetic dyes. Amsterdam: Elsevier, 2007.

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Color chemistry: Syntheses, properties, and applications of organic dyes and pigments. 3rd ed. Zürich: Verlag Helvetica Chimica Acta, 2003.

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Zollinger, Heinrich. Color chemistry: Syntheses, properties, and applications of organic dyes and pigments. Weinheim, Federal Republic of Germany: VCH, 1987.

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Zollinger, Heinrich. Color chemistry: Syntheses, properties, and applications of organic dyes and pigments. 2nd ed. Weinheim: VCH, 1991.

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Zollinger, Heinrich. Color chemistry: Syntheses, properties and applications of organic dyes and pigments. Weinheim: VCH, 1987.

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Wanser, Stephen. Summary of trade and tariff information: Synthetic organic dyes : TSUS items 409.46-410.24(pt.) and 410.36-410.44. Washington, DC: U.S. International Trade Commission, 1985.

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Wanser, Stephen. Summary of trade and tariff information: Synthetic organic dyes : TSUS items 409.46-410.24(pt.) and 410.36-410.44. Washington, DC: U.S. International Trade Commission, 1985.

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Book chapters on the topic "Natural organic pigments and dyes"

1

Mansour, Rym. "Natural Dyes and Pigments: Extraction and Applications." In Handbook of Renewable Materials for Coloration and Finishing, 75–102. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119407850.ch5.

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Yıldırım, Fatma Filiz, Arzu Yavas, and Ozan Avinc. "Printing with Sustainable Natural Dyes and Pigments." In Sustainable Textiles: Production, Processing, Manufacturing & Chemistry, 1–35. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38545-3_1.

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Mahapatra, Debarshi Kar, and Sanjay Kumar Bharti. "Pharmaceutical Natural and Synthetic Colorants, Pigments, Dyes, and Lakes: Applications, Perspectives, and Regulatory Aspects." In Biologically Active Natural Products, 205–23. Includes bibliographical references and index.: Apple Academic Press, 2020. http://dx.doi.org/10.1201/9781003057505-6.

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Gill, M., and W. Steglich. "Pigments of Fungi (Macromycetes)." In Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products, 1–297. Vienna: Springer Vienna, 1987. http://dx.doi.org/10.1007/978-3-7091-6971-1_1.

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Koren, Zvi C. "Modern Chemistry of the Ancient Chemical Processing of Organic Dyes and Pigments." In ACS Symposium Series, 197–217. Washington, DC: American Chemical Society, 2015. http://dx.doi.org/10.1021/bk-2015-1211.ch007.

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Achenbach, Hans. "The Pigments of the Flexirubin-Type. A Novel Class of Natural Products." In Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products, 73–111. Vienna: Springer Vienna, 1987. http://dx.doi.org/10.1007/978-3-7091-8906-1_2.

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Parra, Enrique. "Application of HPLC–DAD–QTOF to the Analysis of Natural and Synthetic Organic Pigments in Paint Layers." In Advanced Characterization Techniques, Diagnostic Tools and Evaluation Methods in Heritage Science, 77–90. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75316-4_6.

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Sharma, Bechan, and Nitika Singh. "Effects of chemical environmental factors (both natural and anthropogenic) on DNA and their modes of action. A. Organic factors (pesticides, dyes) B. Inorganic Factors (Heavy metals)." In Environmental Damage to DNA and the Protective Effects of Phytochemicals, 25–34. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9780429342059-3.

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Kartini, Indriana, and Adhi Dwi Hatmanto. "Natural Dyes: From Cotton Fabrics to Solar Cells." In Dyes and Pigments - Novel Applications and Waste Treatment. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97487.

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This article will discuss natural dyes’ role, from colouring the cotton fabrics with some functionality to harvesting sunlight in the dye-sensitized solar cells. Natural dye colourants are identical to the low light- and wash-fastness. Therefore, an approach to improving the colourant’s physical properties is necessary. Colouring steps employing silica nanosol and chitosan will be presented. The first part will be these multifunctional natural dye coatings on cotton fabrics. Then, functionality such as hydrophobic surfaces natural dyed cotton fabrics will be discussed. Natural dyes are also potential for electronic application, such as solar cells. So, the second part will present natural dyes as the photosensitizers for solar cells. The dyes are adsorbed on a semiconductor oxide surface, such as TiO2 as the photoanode. Electrochemical study to explore natural dyes’ potential as sensitizer will be discussed, for example, natural dyes for Batik. Ideas in improving solar cell efficiency will be discussed by altering the photoanode’s morphology. The ideas to couple the natural dyes with an organic–inorganic hybrid of perovskite and carbon dots are then envisaged.
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Kumar, Ashok, Utkarsh Dixit, Kaman Singh, Satya Prakash Gupta, and Mirza S. Jamal Beg. "Structure and Properties of Dyes and Pigments." In Dyes and Pigments - Novel Applications and Waste Treatment. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97104.

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Colour is one of the elements of nature that makes human life more aesthetic and fascinating in the world. Plants, animals, and minerals have been used as primary sources for colourants, dyes or pigments since ancient times. In our daily life, we know about many substances which have specific colours. These are the substances which are used as colourants i.e.; colour imparting species. Both dyes and pigments are coloured as they absorb only some wavelength of visible light. Their structures have Aryl rings that have delocalized electron systems. These structures are said to be responsible for the absorption of electromagnetic radiation that has varying wavelengths, based upon the energy of the electron clouds. Dyes are coloured organic compounds that are used to impart colour to various substrates, including paper, leather, fur, hair, drugs, cosmetics, waxes, greases, plastics and textile materials. A Dye is a coloured compound due to the presence of chromophore and its fixed property to the acid or basic groups such as OH, SO3H, NH2, NR2, etc. The polar auxochrome makes the dye water-soluble and binds the dye to the fabric by interaction with the oppositely charged groups of the fabric structure. Pigments are organic and inorganic compounds which are practically insoluble in medium in which they are incorporated. Dyes and pigments are the most important colourants used to add colour or to change the colour of something. They are widely used in the textile, pharmaceutical, food, cosmetics, plastics, paint, ink, photographic and paper industries. This chapter is devoted to the structure and properties of dyes and pigments.
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Conference papers on the topic "Natural organic pigments and dyes"

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Castillo, D., A. Sánchez Juárez, S. Espinosa Tapia, A. Guaman, and D. Obregón Calderón. "Twenty natural organic pigments for application in dye sensitized solar cells." In SPIE Organic Photonics + Electronics, edited by Zakya H. Kafafi, Paul A. Lane, and Ifor D. W. Samuel. SPIE, 2016. http://dx.doi.org/10.1117/12.2238395.

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Nakazumi, Hiroyuki, Tarao Takashi, Shin-ichi Taniguchi, and Hidehito Nanto. "Fluorescent thin gel films using organic dyes and pigments." In Optical Science, Engineering and Instrumentation '97, edited by Bruce S. Dunn, John D. Mackenzie, Edward J. A. Pope, Helmut K. Schmidt, and Masayuki Yamane. SPIE, 1997. http://dx.doi.org/10.1117/12.284119.

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Sánchez Juárez, A., D. Castillo, A. Guaman, S. Espinosa, and D. Obregón. "Study of natural organic dyes as active material for fabrication of organic light emitting diodes." In SPIE Organic Photonics + Electronics, edited by Franky So, Chihaya Adachi, and Jang-Joo Kim. SPIE, 2016. http://dx.doi.org/10.1117/12.2238429.

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Alexander, Scott C. "Spectral Deconvolution and Quantification of Natural Organic Material and Fluorescent Tracer Dyes." In 10th Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. Reston, VA: American Society of Civil Engineers, 2005. http://dx.doi.org/10.1061/40796(177)47.

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Ramelan, A. H., H. Harjana, and L. S. Sakti. "Titanium dioxide nanostructure synthesized by sol-gel for organic solar cells using natural dyes extracted from black and red sticky rice." In SPIE Photonics Europe, edited by Barry P. Rand, Chihaya Adachi, and Volker van Elsbergen. SPIE, 2012. http://dx.doi.org/10.1117/12.924647.

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Estrada-Pe´rez, Carlos E., Sinchao Tan, and Yassin A. Hassan. "Whole-Field Temperature and Velocity Measurements for Two-Phase Flow Using PIV/LIF." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44507.

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In this study, an improved 2-D LIF/PTV technique is presented for the simultaneous measurement of temperature and velocity fields of cavity flows. 2-D Whole-Field temperature measurements are achieved by the two-color/two-dyes laser-induced fluorescence (LIF) technique, while the 2-D velocity is measured with particle tracking velocimetry (PTV) method. The improvements presented in this work is the modification of the commonly selected dyes to achieve the two-color LIF technique. Traditionally the organic dyes used to perform two-color LIF measurements are Rhodamine-B and Rhodamine-110, Rhodamine-B provides a fluorescence emission dependent on temperature while Rhodamine-110 provides an emission independent of temperature. In this work, Rhodamine-110 is replaced by Fluorescein-27, which provides a second temperature dependent dye. By using two temperature dependent dyes, the temperature sensitivity of the technique is increased. Also, in this work, a sensitivity analysis of the RHB-FL27 solution properties is presented, and its application to a natural convection two-phase flow within a cavity is explored.
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Viana, Tania, Sara Biscaia, Henrique A. Almeida, and Paulo J. Bártolo. "PCL/Eggshell Scaffolds for Bone Regeneration." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20213.

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Eggshell (ES) is one of the most common biomaterials in nature. For instance, the ES represents 11% of the total weight of a hen’s egg and it is composed of calcium carbonate, magnesium carbonate, tricalcium phosphate and organic matter. Hen ES are also a major waste product of the food industry worldwide. Recently, ES have been used for many applications such as coating pigments for inkjet printing paper, catalyst for biodiesel synthesis, bio-fillers for polymer composites and matrix lipase immobilization. It is also considered a natural biomaterial with high potential for the synthesis of calcium enriched implants that may be applied in tissue engineering applications, such as bone regeneration. The aim of this research regards the production of poly(ε-caprolactone) (PCL) scaffolds enriched with hen ES powder for bone regeneration applications, using an extrusion-based process called Dual-Bioextruder. The main objective is to investigate the influence of the addition of ES powder on the PCL matrix. For this purpose the structures were characterised regarding morphological and chemical properties. Morphological images of the PCL scaffolds enriched with hen ES, demonstrated the interconnectivity of the pores within the scaffold and revealed that the addition of the ES powder combined with the screw rotation velocity has a large influence on the resulting filament diameter and consequently on the porosity of the scaffolds.
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Ribeiro, A., C. Vilarinho, J. Araújo, and J. Carvalho. "Electrokinetic Remediation of Contaminated Soils With Chromium." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87552.

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Soil is a vital natural resource that regulates our environment sustainability and provide essential resources to humans and nature. Nowadays, with an increasingly populated and urbanized world, pollution is widely recognized as a significant challenge to soil and groundwater resources management. The most common chemicals found in soils and water plumb in a dissolved state and considered as potential pollutants are heavy metals, dyes, phenols, detergents, pesticides, polychlorinated biphenyls (PCBs), and others organic substances, such as organic matter. Unlike organic contaminants, heavy metals are not biodegradable and tend to accumulate in living organisms and many heavy metal ions are known to be toxic or carcinogenic. Toxic heavy metals of particular concern zinc, copper, nickel, mercury, cadmium, lead and chromium. Electrokinetic remediation deserves particular attention in soil treatment due to its peculiar advantages, including the capability of treating fine and low permeability materials, and achieving consolidation, dewatering and removal of salts and inorganic contaminants like heavy metals in a single stage. In this study, the remediation of artificially chromium contaminated soil by electrokinetic process, coupled with Eggshell Inorganic Fraction Powder (EGGIF) permeable reactive barrier (PRB), was investigated. An electric field of 2 V cm−1 was applied and was used an EGGIF/soil ratio of 30 g kg−1 of contaminated soil for the preparation of the permeable reactive barrier (PRB) in each test. Results proved that the study of chromium mobility revealed the predominance in its transportation through the soil towards the anode, due essentially to the existence of chromium in the form of oxyanions (chromate and dichromate), which confers a negative charge to the molecule. Chromium removal by electrokinetic remediation was faster in low levels of concentration and the utilization of citric acid as buffer and complexing agent allowed to maintain pH of soil below the precipitation limit for this element. It was obtained high removal rates of chromium in both experiments, especially near the anode. In the normalized distance to cathode of 0.8 it was achieved a maximum removal rate of chromium of 55, 59 and 60% in initial chromium concentration of 500 mg kg−1, 250 mg kg−1 and 100 mg kg−1, respectively. The viability of the new coupling technology developed (electrokinetic with EGGIF permeable reactive barrier) to treat low-permeability polluted soils was demonstrated. Based on the proved efficiency, this remediation technique has to be optimized and applied to real soils in order to validate it as a large-scale solution.
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