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Journal articles on the topic 'Cationic dyes; Redox properties'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Adeyi, Abel Adekanmi, Siti Nurul Ain Md Jamil, Luqman Chuah Abdullah, Thomas Shean Yaw Choong, Kia Li Lau, and Mohammad Abdullah. "Adsorptive Removal of Methylene Blue from Aquatic Environments Using Thiourea-Modified Poly(Acrylonitrile-co-Acrylic Acid)." Materials 12, no. 11 (2019): 1734. http://dx.doi.org/10.3390/ma12111734.

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The paper evaluates the adsorptive potential of thiourea-modified poly(acrylonitrile-co-acrylic acid), (TA-poly(AN-co-AA)) for the uptake of cationic methylene blue (MB) from aquatic environments via a batch system. TA-poly(AN-co-AA) polymer was synthesized through redox polymerization and modified with thiourea (TA) where thioamide groups were introduced to the surface. Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), CHNS and Zetasizer were used to characterize the physico-chemical and morphological properties of prepared TA-poly(AN-co-AA). Afterwards, it was confirmed that incorporation of thioamide groups was successful. The adsorption kinetics and equilibrium adsorption data were best described, respectively, by a pseudo-second-order model and Freundlich model. Thermodynamic analysis showed the exothermic and spontaneous nature of MB uptake by TA-poly(AN-co-AA). The developed TA-poly(AN-co-AA) polymer demonstrated efficient separation of MB dye from the aqueous solution and maintained maximum adsorption capacity after five regeneration cycles. The findings of this study suggested that synthesized TA-poly(AN-co-AA) can be applied successfully to remove cationic dyes from aquatic environments.

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Cahya Prima, Eka, Brian Yuliarto, Suyatman, and Hermawan Kresno Dipojono. "Theoretical Investigation of Anthocyanidin Aglycones as Photosensitizers for Dye-Sensitized TiO₂ Solar Cells." Advanced Materials Research 1112 (July 2015): 317–20. http://dx.doi.org/10.4028/www.scientific.net/amr.1112.317.

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The aim of this study is to analyze dye electronic properties of anthocyanin aglycones to be used as photosensitizers for TiO2solar cells. The dye properties will be examined by the density functional theory (DFT) method at IEF-PCM(UFF)/B3LYP/6-31+G(d,p) levels under ethanol and water environments. The results show that the position of LUMOs of all dyes lying over TiO2ECBwill facilitate good electron transfer while their HOMOs, which are lower than the electrolyte redox potential energy, can facilitate good oxidized-dye regeneration. Flavilium cation dye is the best anthocyanidin aglycone due to the best electron injection spontaneity of -0.807 eV as well as the highest open circuit voltage of 1.669 V. On the other hand, quinonoidal base dye gives the best light harvesting efficiency of 69.24% due to the best oscillating strength character. Moreover, the solvent effect is the important aspect regarding the dye oxidation potential stabilization as well as the electron injection driving force.

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3

Dollendorf, Christian, Martin Hetzer, and Helmut Ritter. "Polymeric redox-responsive delivery systems bearing ammonium salts cross-linked via disulfides." Beilstein Journal of Organic Chemistry 9 (August 13, 2013): 1652–62. http://dx.doi.org/10.3762/bjoc.9.189.

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A redox-responsive polycationic system was synthesized via copolymerization of N,N-diethylacrylamide (DEAAm) and 2-(dimethylamino)ethyl methacrylate (DMAEMA). N,N’-bis(4-chlorobutanoyl)cystamine was used as disulfide-containing cross-linker to form networks by the quaternization of tertiary amine groups. The insoluble cationic hydrogels become soluble by reduction of disulfide to mercaptanes by use of dithiothreitol (DTT), tris(2-carboxyethyl)phosphine (TCEP) or cysteamine, respectively. The soluble polymeric system can be cross-linked again by using oxygen or hydrogen peroxide under basic conditions. The redox-responsive polymer networks can be used for molecular inclusion and controlled release. As an example, phenolphthalein, methylene blue and reactive orange 16 were included into the network. After treatment with DTT a release of the dye could be recognized. Physical properties of the cross-linked materials, e.g., glass transition temperature (T g), swelling behavior and cloud points (T c) were investigated. Redox-responsive behavior was further analyzed by rheological measurements.

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4

Huang, Liyi, Ying-Ying Huang, Pawel Mroz, et al. "Stable Synthetic Cationic Bacteriochlorins as Selective Antimicrobial Photosensitizers." Antimicrobial Agents and Chemotherapy 54, no. 9 (2010): 3834–41. http://dx.doi.org/10.1128/aac.00125-10.

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ABSTRACT Photodynamic inactivation is a rapidly developing antimicrobial treatment that employs a nontoxic photoactivatable dye or photosensitizer in combination with harmless visible light to generate reactive oxygen species that are toxic to cells. Tetrapyrroles (e.g., porphyrins, chlorins, bacteriochlorins) are a class of photosensitizers that exhibit promising characteristics to serve as broad-spectrum antimicrobials. In order to bind to and efficiently penetrate into all classes of microbial cells, tetrapyrroles should have structures that contain (i) one or more cationic charge(s) or (ii) a basic group. In this report, we investigate the use of new stable synthetic bacteriochlorins that have a strong absorption band in the range 720 to 740 nm, which is in the near-infrared spectral region. Four bacteriochlorins with 2, 4, or 6 quaternized ammonium groups or 2 basic amine groups were compared for light-mediated killing against a Gram-positive bacterium (Staphylococcus aureus), a Gram-negative bacterium (Escherichia coli), and a dimorphic fungal yeast (Candida albicans). Selectivity was assessed by determining phototoxicity against human HeLa cancer cells under the same conditions. All four compounds were highly active (6 logs of killing at 1 μM or less) against S. aureus and showed selectivity for bacteria over human cells. Increasing the cationic charge increased activity against E. coli. Only the compound with basic groups was highly active against C. albicans. Supporting photochemical and theoretical characterization studies indicate that (i) the four bacteriochlorins have comparable photophysical features in homogeneous solution and (ii) the anticipated redox characteristics do not correlate with cell-killing ability. These results support the interpretation that the disparate biological activities observed stem from cellular binding and localization effects rather than intrinsic electronic properties. These findings further establish cationic bacteriochlorins as extremely active and selective near-infrared activated antimicrobial photosensitizers, and the results provide fundamental information on structure-activity relationships for antimicrobial photosensitizers.

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Xiang, Zheng, Yue-Bin Shan, Tao Li, Chang-Cang Huang, Xi-He Huang, and Mei-Jin Lin. "Four isostructural lanthanide(III) coordination compounds based on a new N-oxydic pyridyl naphthalenediimide ligand: synthesis and characterization." Acta Crystallographica Section C Structural Chemistry 75, no. 1 (2019): 38–45. http://dx.doi.org/10.1107/s2053229618017357.

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Naphthalenediimides, an attractive class of electron-deficient organic dyes with rich redox and photoredox properties, have been investigated extensively as building blocks for coordination networks or metal–organic frameworks in recent decades. However, most of the available work has focused on d-block metal cations rather than f-block lanthanide ions, whose complexes exhibit a large variability in coordination numbers. In this article, four coordination polymers composed of naphthalenediimides and lanthanide cations, namely catena-poly[[[tris(nitrato-κ2 O,O′)lanthanide]-bis{μ-N,N′-bis[(1-oxidopyridin-1-ium-3-yl)methyl]-1,8:4,5-naphthalenetetracarboxdiimide-κ2 O:O′}-[tris(nitrato-κ2 O,O′)lanthanide]-μ-N,N′-bis[(1-oxidopyridin-1-ium-3-yl)methyl]-1,8:4,5-naphthalenetetracarboxdiimide-κ2 O:O′] methanol disolvate], {[Ln(C26H16N4O4)1.5(NO3)3]·CH3OH} n , with Ln = Eu, 1, Gd, 2, Dy, 3, and Er, 4, have been successfully synthesized under hydrothermal conditions. Single-crystal X-ray diffraction analyses revealed that the four compounds are isomorphic and that each asymmetric unit contains one nine-coordinated Ln centre, one and a half diimide ligands, three nitrate anions and one uncoordinated methanol molecule. In addition, each metal centre is surrounded by nine O atoms in a distorted tricapped trigonal–prismatic geometry. Two centres are bridged by two cis ligands to form a ring, which is further bridged by trans ligands to generate one-dimensional chains. Neighbouring chains are stacked via π–π interactions between pyridine rings to give a two-dimensional structure, which is stabilized by π–π interactions between naphthalene rings, forming the final three-dimensional supermolecular network. Solid-state optical diffuse-reflectance spectral studies indicate that compound 4 is a potential wide band gap semiconductor.

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6

Tatikolov, A. S., Kh S. Dzhulibekov, and Zh A. Krasnaya. "Fluorescent properties of cationic-anionic polymethine dyes." Bulletin of the Russian Academy of Sciences Division of Chemical Science 41, no. 11 (1992): 1992–97. http://dx.doi.org/10.1007/bf00863361.

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7

Cui, Shuling. "Structure and dyeing properties of jade fibre." Pigment & Resin Technology 43, no. 3 (2014): 139–44. http://dx.doi.org/10.1108/prt-08-2013-0071.

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Purpose – Based on clarifying the structural difference between jade fibre and general polyester fibre, this paper aims to study the dyeing properties and dyeing adsorption mechanism of jade fibre with disperse dye and cationic dye. Design/methodology/approach – The chemical structure and microstructure of jade fibre were briefly explained comparing with ordinary polyester fibre. The dyeing rate curve and dyeing adsorption isotherm of disperse dyes and cationic dyes on jade fibre were, respectively, studied. The dyeing uptake, dyeing absorption mechanism, and the main dyeing process parameters were proposed. Findings – Jade fibre can be dyed with cationic dye and disperse dye. The suitable exhaust dyeing process is 110°C and 40 minutes for disperse dye, 100°C and 60 minutes for cationic dye. The dyeing uptake on jade fibre with both disperse dyes or cationic dyes is much higher than that on general polyester fibre and acrylic fibre, and the dyeing adsorption mechanism belongs to the combination of Langmuir and Nernst adsorption for disperse dyes and Langmuir adsorption for cationic dyes. Comparing with ordinary polyester fibre, jade fibre has the advantage of low temperature dyeing and reduced effluent, as is significant to energy-saving and emission reduction. Originality/value – Jade fibre is a new type of modified polyester fibre with the function of health protection and energy conservation. There are little technical data in the literature at present about the dyeing property of jade fibre.

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8

Rao, Xiao Juan, Qiong Yu Hu, Li Jun Li, Fei Xiong, and Gen Yang Cao. "Adhesion Properties of Pigment Dyes Using Ultrasonic Energy." Advanced Materials Research 750-752 (August 2013): 2340–43. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.2340.

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Pigment dyes are vastly used in dyeing and printing of all kinds of fibers. Ultrasonic energy and cationic modifying were applied in pigment dyeing. The results shown that both of cationic modify and ultrasonic energy can make for better dyeing effect. And the ultrasonic energys condition is 30 °C in 5 min.

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9

Teng, Xiao Xu, Jian Wei Shi, and Shu Fen Zhang. "Impact of Reactive Dye Structures on Dyeing Properties in Salt-Free Reactive Dyeing." Advanced Materials Research 781-784 (September 2013): 2716–21. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2716.

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The cationic cotton was obtained by pretreatment with tertiary amine cationic polyacrylamide, and dyed with various active groups reactive dyes in the absence of salt. The influences of reactive dye structures on dyeing properties were analyzed and the results showed that types of active groups in reactive dyes had little effect on dye exhaustion, but it was quite relative with dye reactivity and fixation. Reactive dyes with low molecular weight and more anionic groups were adsorbed more quickly on the cationic cotton and their adsorption time to reach adsorption equilibrium was shorter, compared with that with large molecular weight and less anionic groups. Moreover, exhaustion of reactive dyes with large molecular structures decreased due to sterically hindered effect in the salt-free dyeing. The results also displayed that the monochlorotriazine reactive dyes and the vinyl-sulfone ones were favorable to dye the cationic cotton without salt addition.

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10

Matsushima, Ryoka, Naoko Nishimura, and Yoshiumi Kohno. "Vapochromic Properties of Nafion Film Doped with Cationic Dyes." Chemistry Letters 32, no. 3 (2003): 260–61. http://dx.doi.org/10.1246/cl.2003.260.

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11

Xiang, Wei, and Zai Sheng Cai. "Properties of Multiple-Functional Cationic Silk Fabrics." Advanced Materials Research 79-82 (August 2009): 211–14. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.211.

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The silk fabric was chemically modified with 3-(trimethoxysilyl) propyl dodecyl dimethyl ammonium chloride (HSQA), a cationic modifying agent, to promote antibacterial property against S. aureus and E. coli. The dyeing and colorfastness properties of modified fabrics with commercial synthetic dyes, that is, acid and reactive dyes were also improved. The modified silk fabrics also exhibited some improved resiliency. Therefore, the wear properties of fabrics were expected to be improved by the technique of modification. However, the modification caused a slight decrease in the tensile strength of silk fabrics, as well as the whiteness and wettability because of introducing hydrophobic siloxane chains into amorphous regions of silk fibroin. The surface structure of modified silk fiber was studied by X-ray photoelectron spectra (XPS) and FT-IR spectra. Key words: Silk fabric; multiple-function; Wear property; antibacterial property; X-ray photoelectron spectrum; FT-IR spectrum

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12

Cui, Shuling, and Chunxiao Dou. "Dyeing properties of PSA/MPIA blended yarn." Pigment & Resin Technology 43, no. 5 (2014): 256–62. http://dx.doi.org/10.1108/prt-12-2013-0117.

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Purpose – The purpose of this paper was to study the dyeing properties of polysulphonamide (PSA)/aramid 1313 (MPIA) blended yarn by selecting suitable dyes and carriers required in the dyeing process. Design/methodology/approach – Dyeing the blended yarn with cationic dyes, acid dyes, disperse dyes, reactive dyes and pigment, and comparing the shades, K/S values and fastness of the blended yarns. Findings – The PSA/MPIA blended fibre is suitable for dyeing with the cationic dye at high temperature and pressure in the presence of carrier acetophenone, and good homochromatism is seen on the two fibres when using same type of dye. Originality/value – PSA fibre is a thermo-resistant and flame-retardant product made in China in recent years. Blended with aramid 1313 fibre, it may acquire good spinnability. But there is little technical report about properties of the blended yarn in the literature at present. This paper reports the dyeing property of such fibres for the first time.

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13

Wlodarczyk, Andrzej, Anna Wlodarczyk, John C. Jeffery, Jon A. McCleverty, and Michael D. Ward. "Cationic ?-diketonato molybdenum nitrosyl complexes: redox and structural properties." Transition Metal Chemistry 20, no. 6 (1995): 559–64. http://dx.doi.org/10.1007/bf00136420.

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14

Choukroun, Robert, Benedicte Douziech, Cheng Pan, Francoise Dahan, and Patrick Cassoux. "Redox Properties of Cationic Vanadium(IV): [Cp2VCH3(CH3CN)][BPh4]." Organometallics 14, no. 10 (1995): 4471–73. http://dx.doi.org/10.1021/om00010a010.

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15

Gao, Shu Zhen, and Qun Liu. "The Investigation of Dyeing Properties of Anion Modified Linen Fibers." Advanced Materials Research 535-537 (June 2012): 1605–8. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1605.

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Linen fibers oxidated by sodium periodate were anion-modified with sodium bisulfite, and treated linen fibers were dyed with cationic dyes. The thermodynamics principle of dyeing on modified linen fibers has been investigated by means of drawing adsorption isotherms,calculating dyeing saturation value and measuring dyeing levelness. The results indicate that adsorption isotherm of dyeing modified linen fibers with cationic dyes belongs to Langmuir adsorption isotherm,and the levelness of modified linen fabrics was better, the results indicate that the function of modification agent on linen fibers were more comprehensive and balanced.

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16

Xiao, Hang, Chunhong Li, Peng Wang, and Tao Zhao. "A feasible approach for enhancing union dyeing of wool/acrylic blend fabrics with heterobifunctional cationic reactive dyes." Textile Research Journal 89, no. 23-24 (2019): 5085–95. http://dx.doi.org/10.1177/0040517519849452.

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In this work, a facile method to enhance union dyeing with cationic reactive dyes on wool/acrylic blend fabrics was reported. Three cationic reactive dyes containing various numbers of reactive groups were synthesized and employed on wool, acrylic and wool/acrylic blend fabrics using the one-bath one-step method. Factors affecting the dye exhaustion, union dyeing and leveling properties, including dyeing pH, temperature and dye structure, were investigated. Experimental results revealed that the cationic reactive dye containing heterobifunctional reactive groups and a cationic group attached on the backbone of structure exhibited better union dyeing properties, irrespective of dyeing method. The improvement in the union dyeing on wool and acrylic fabrics followed a decreasing order: Dye 1 > Dye 3 > Dye 2. In additional, the wool/acrylic blend fabrics dyed with Dye 1 showed outstanding leveling properties. The fastness properties of wool/acrylic fabrics for all cationic reactive dyes were good to excellent.

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17

Tomoda, Bruno Thorihara, Murilo Santos Pacheco, Yasmin Broso Abranches, Juliane Viganó, Fabiana Perrechil, and Mariana Agostini De Moraes. "Assessing the Influence of Dyes Physico-Chemical Properties on Incorporation and Release Kinetics in Silk Fibroin Matrices." Polymers 13, no. 5 (2021): 798. http://dx.doi.org/10.3390/polym13050798.

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Silk fibroin (SF) is a promising and versatile biodegradable protein for biomedical applications. This study aimed to develop a prolonged release device by incorporating SF microparticles containing dyes into SF hydrogels. The influence of dyes on incorporation and release kinetics in SF based devices were evaluated regarding their hydrophilicity, molar mass, and cationic/anionic character. Hydrophobic and cationic dyes presented high encapsulation efficiency, probably related to electrostatic and hydrophobic interactions with SF. The addition of SF microparticles in SF hydrogels was an effective method to prolong the release, increasing the release time by 10-fold.

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18

Takeda, Yoshihiko, Shigeru Takahara, Yoshiko Kobayashi, Hiroaki Misawa, Hirochika Sakuragi, and Katsumi Tokumaru. "Isoporphyrins. Near-Infrared Dyes with Noticeable Photochemical and Redox Properties." Chemistry Letters 19, no. 11 (1990): 2103–6. http://dx.doi.org/10.1246/cl.1990.2103.

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19

López-Duarte, Ismael, Phoom Chairatana, Yilei Wu, et al. "Thiophene-based dyes for probing membranes." Organic & Biomolecular Chemistry 13, no. 12 (2015): 3792–802. http://dx.doi.org/10.1039/c4ob02507e.

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20

Zhao, Weiwei, Hua Wang, and Yilin Wang. "Coacervation of dynamic covalent surfactants with polyacrylamides: properties and applications." Soft Matter 14, no. 20 (2018): 4178–84. http://dx.doi.org/10.1039/c8sm00773j.

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21

Wang, Meihui, Xianfeng Wang, Chong Guo, Tao Zhao, and Wenyao Li. "A Feasible Method Applied to One-Bath Process of Wool/Acrylic Blended Fabrics with Novel Heterocyclic Reactive Dyes and Application Properties of Dyed Textiles." Polymers 12, no. 2 (2020): 285. http://dx.doi.org/10.3390/polym12020285.

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Reactive dyes containing cationic groups have great potentiality as novel dyes, which can be applicable to one-bath dyeing of wool/acrylic blended fabrics. In this work, four novel heterocyclic reactive dyes containing cationic groups were designed by using m-aminophenyltrimethylammonium salt or N-(2-aminoethyl) pyridinium chloride salt as cationic groups, N, N-diethyl-1,3-benzenediamine as a coupling component, 2-amino-6-methoxybenzothiazole, 2-aminobenzothiazole or 3-amino-5-nitrobenzoisothiazole as diazo components. These dyes based on benzothiazole derivative chromophores not only showed beautiful color, including blue-green and fuchsia, but also had larger tinctorial strength with a high molar extinction coefficient, further reducing the dosage of dyes to achieve same color depth. Factors affecting the dyeability on fabrics, such as pH value, dyeing temperature and dye concentration were discussed. Excellent dyeing behavior, levelling properties and good fastness on wool/acrylic blended fabric were obtained. What’ more, excellent anti-ultraviolet and antibacterial properties were obtained for textiles with these dyes. The application of these dyes with large molar extinction coefficients presents a wide range of possibilities for the further development of cleaner production and eco-friendly dyeing, even functional textiles.

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22

Bulavko, G. V., and A. A. Ishchenko. "The nature of counterion and photovoltaic properties of cationic polymethine dyes." Reports of the National Academy of Sciences of Ukraine, no. 7 (July 20, 2015): 110–15. http://dx.doi.org/10.15407/dopovidi2015.07.110.

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23

Kabatc, Janina, and Katarzyna Jurek. "New two- and three-cationic polymethine dyes. Synthesis, properties and application." Dyes and Pigments 112 (January 2015): 24–33. http://dx.doi.org/10.1016/j.dyepig.2014.06.016.

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24

Fukatsu, Kazuhiko. "Dyeing and Mechanical Properties of Cotton Modified for Cationic Dyes with Hydrophobic and Acidic Groups." Textile Research Journal 62, no. 3 (1992): 135–39. http://dx.doi.org/10.1177/004051759206200303.

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Basic studies define the relationship between dyeability for cationic dyes and mechanical properties of chemically modified cotton fabric. Introduction of benzoyl and sulfonic acid groups provides either satisfactory dyeability for cationic dyes or color-fastness, and mechanical properties are reported as a function of the benzoate degree of substitution value. The general trend is toward increased breaking load and bending stiffness and decreased wrinkle recovery for the chemically modified fabrics, but within this trend there is latitude for selection of the degree of substituent groups to provide superior performance.

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Kreller, David I., and Prashant V. Kamat. "Photochemistry of sensitizing dyes: spectroscopic and redox properties of cresyl violet." Journal of Physical Chemistry 95, no. 11 (1991): 4406–10. http://dx.doi.org/10.1021/j100164a044.

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26

Bouit, Pierre-Antoine, Emmanuel Di Piazza, Stéphane Rigaut, et al. "Stable Near-Infrared Anionic Polymethine Dyes: Structure, Photophysical, and Redox Properties." Organic Letters 10, no. 19 (2008): 4159–62. http://dx.doi.org/10.1021/ol801416n.

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27

Kaerkitcha, N., and T. Sagawa. "Amplified polarization properties of electrospun nanofibers containing fluorescent dyes and helical polymer." Photochemical & Photobiological Sciences 17, no. 3 (2018): 342–51. http://dx.doi.org/10.1039/c7pp00413c.

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Well-aligned nanofibers containing cationic fluorescent dyes and anionic chiral polymers prepared via electrospinning exhibit an enhanced circular dichroism, which is mainly caused by linear dichroism and linear birefringence.

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28

Hashemi, Nastaran, and Gang Sun. "Intermolecular Interactions between Surfactants and Cationic Dyes and Effect on Antimicrobial Properties." Industrial & Engineering Chemistry Research 49, no. 18 (2010): 8347–52. http://dx.doi.org/10.1021/ie101001d.

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Xie, Kongliang, and Aiqin Hou. "Synthesis, Properties, and Application of Cationic Reactive Disperse Dyes Containing Quaternary Group." Journal of Dispersion Science and Technology 29, no. 3 (2008): 436–39. http://dx.doi.org/10.1080/01932690701718834.

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Ren, Zhiping, Chuanxiang Qin, Ren-Cheng Tang, and Guoqiang Chen. "Study on the dyeing properties of hemicyanine dyes. II. Cationic dyeable polyester." Coloration Technology 128, no. 2 (2012): 147–52. http://dx.doi.org/10.1111/j.1478-4408.2012.00360.x.

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Voropai, E. S., M. P. Samtsov, K. N. Kaplevskii, A. A. Lugovskii, and E. N. Alexandrova. "Spectral-Luminescent Properties of Cationic Indotricarbocyanine Dyes in Cancerous Cells and Solutions." Journal of Applied Spectroscopy 71, no. 2 (2004): 180–86. http://dx.doi.org/10.1023/b:japs.0000032872.04743.f6.

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Zhang, Yi, Lu Liang, Yong Chen, Xu-Man Chen, and Yu Liu. "Construction and efficient dye adsorption of supramolecular hydrogels by cyclodextrin pseudorotaxane and clay." Soft Matter 15, no. 1 (2019): 73–77. http://dx.doi.org/10.1039/c8sm02203h.

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Song, Tao, Jiancan Yu, Yuanjing Cui, Yu Yang, and Guodong Qian. "Encapsulation of dyes in metal–organic frameworks and their tunable nonlinear optical properties." Dalton Transactions 45, no. 10 (2016): 4218–23. http://dx.doi.org/10.1039/c5dt03466c.

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Valdés, H., H. P. Godoy, and C. A. Zaror. "Heterogeneous catalytic ozonation of cationic dyes using volcanic sand." Water Science and Technology 61, no. 12 (2010): 2973–78. http://dx.doi.org/10.2166/wst.2010.257.

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This work aims to present experimental results on the treatment of methylene blue contaminated waters using heterogeneous catalytic ozonation promoted by volcanic sand. The effect of pH (2–8), and the presence of radical scavengers (acetate ions) in homogeneous and heterogeneous systems are evaluated at laboratory scale. Heterogeneous catalytic ozonation using volcanic sand increases methylene blue removal rate. In the presence of free radical scavengers, only a 37% reduction on methylene blue removal rate is observed in the heterogeneous system, as compared with 70% when homogeneous ozonation is used. The results obtained here indicate the importance of chemical surface properties on methylene blue oxidation reactions, suggesting that acid surface sites of volcanic sand play a key role on the reaction mechanism.

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35

Reyes-Gutiérrez, Paul E., Michael Jirásek, Lukáš Severa, et al. "Functional helquats: helical cationic dyes with marked, switchable chiroptical properties in the visible region." Chemical Communications 51, no. 9 (2015): 1583–86. http://dx.doi.org/10.1039/c4cc08967g.

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36

Kubáň, Vlastimil, Irena Jančářová, Josef Hedbávný, and Milan Vrchlabský. "Effect of tensides on the optical properties of sulfophthalein dyes." Collection of Czechoslovak Chemical Communications 54, no. 1 (1989): 70–80. http://dx.doi.org/10.1135/cccc19890070.

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The optical properties of bromocresol red, bromophenol blue and bromocresol green were studied spectrophotometrically in aqueous systems in the absence and in the presence of submicellar and micellar concentrations of cationic (Septonex, hexadecylpyridinium and hexadecyltrimethylammonium bromides), nonionic (Brij 35, Triton X-100) and anionic (sodium dodecylsulfate) tensides. The positions of the absorption maxima and molar absorptivities of the LH- and L2- acid-base species of the dyes depend on the kind and concentration of tenside, alkylpyridinium chain length, and kind and concentration of inert electrolyte.

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37

Gut, Arkadiusz, Łukasz Łapok, Dorota Jamróz, Alexandr Gorski, Jędrzej Solarski, and Maria Nowakowska. "Photophysics and redox properties of aza-BODIPY dyes with electron-withdrawing groups." New Journal of Chemistry 41, no. 20 (2017): 12110–22. http://dx.doi.org/10.1039/c7nj02757e.

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38

Song, Ru Yi, Yong Yan Li, Xin Ping Li, Jing Zhang, and Heng Quan. "Influences of Ion Abundance of Cationic Hydrophilic Polyurethane Modified with Polysiloxane on its Emulsion Properties." Advanced Materials Research 781-784 (September 2013): 2685–89. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.2685.

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Several cationic water-based polyurethanes end-capped with silicone coupling agent with different ion abundance are prepared. The effects of ion abundance of those polyurethanes on its emulsion particle size distribution, wet rubbing fastness improvement, hydrophility and soft handle are studied. The results show that the sample with moderate cationic ion abundance has optimal efficiency for color fixing of reactive dyes, and the quaterized cationic groups in polyurethane molecule should has positive contribution to hydrophility and soft handle of the treated fabric, especially for the color fabric treated with higher concentration polyurethane emulsion.

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Cappello, Daniela, Denis A. B. Therien, Viktor N. Staroverov, François Lagugné‐Labarthet, and Joe B. Gilroy. "Optoelectronic, Aggregation, and Redox Properties of Double‐Rotor Boron Difluoride Hydrazone Dyes." Chemistry – A European Journal 25, no. 23 (2019): 5994–6006. http://dx.doi.org/10.1002/chem.201900383.

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Thalacker, Christoph, Cornelia Röger, and Frank Würthner. "Synthesis and Optical and Redox Properties of Core-Substituted Naphthalene Diimide Dyes." Journal of Organic Chemistry 71, no. 21 (2006): 8098–105. http://dx.doi.org/10.1021/jo0612269.

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Leushina, E. A., I. A. Usol'tsev, S. I. Bezzubov, et al. "BODIPY dyes with thienyl- and dithienylthio-substituents – synthesis, redox and fluorescent properties." Dalton Transactions 46, no. 48 (2017): 17093–100. http://dx.doi.org/10.1039/c7dt03801a.

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Găină, Luiza, Ioana Torje, Emese Gal, et al. "Microwave assisted synthesis, photophysical and redox properties of (phenothiazinyl)vinyl-pyridinium dyes." Dyes and Pigments 102 (March 2014): 315–25. http://dx.doi.org/10.1016/j.dyepig.2013.10.044.

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Wei, Wei, Huihui Hu, Xuelin Ji, Zaoxue Yan, Wei Sun, and Jimin Xie. "Selective adsorption of organic dyes by porous hydrophilic silica aerogels from aqueous system." Water Science and Technology 78, no. 2 (2018): 402–14. http://dx.doi.org/10.2166/wst.2018.313.

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Abstract Hydrophilic silica aerogel (HSA) was obtained by sol-gel method and dried at ambient conditions and further studied for the removal of organic dyes in water. Silica aerogel was characterized by its morphology, porous structure, specific surface area and particle size distribution by scanning electron microscopy, Brunauer–Emmett–Teller and pore size distribution. The HSA after calcination had a specific surface area of 888.73 m2/g and an average particle size of 2.6341 nm. Moreover, adsorption properties of the HSA toward organic dyes – adsorption conditions, kinetics data, and equilibrium model – were investigated. The removal rate of cationic dyes (rhodamine B (RhB), methylene blue (MB) and crystal violet (CV)) by HSA was up to 90%, while the removal rate of anionic dye (acid orange 7) was not more than 30%. The maximum adsorptions were: RhB 191.217 mg/g, MB 51.1601 mg/g and CV 24.85915 mg/g, respectively. Based on the adsorption mechanism of HSA for cationic/anionic dyes, the conclusion confirmed the prospect of HSA as effective adsorbent to treat cationic dyes wastewater.

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Pego, Matheus Felipe Freire, Janaína Carvalho, Willian Borges, and Maria Lúcia Bianchi. "IMPACT OF CORONA TREATED ACTIVATED CARBON IN ANIONIC AND CATIONIC DYE ADSORPTION." CERNE 23, no. 2 (2017): 219–28. http://dx.doi.org/10.1590/01047760201723022300.

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ABSTRACT Dye degradation is a significant topic in environmental science, since dyes can bring several problems to the environment. Activated carbon (AC) is an important material used as adsorbent of these hazardous substances, but need to be improved especially into specific substances. This paper aimed to evaluate the impact of activated carbon surface modified by corona treatment (electric discharge) on adsorption of different dyes. Activated carbons were treated by corona treatment to cause surface modification, modifying exposure time to treatment (2, 5, 8 and 10 minutes). Evaluation of adsorption was performed by adsorption isotherms and kinetic adsorption. Dyes differed in their charge (anionic or cationic) and molecular weight. Dyes used were Methylene Blue (cationic) and Congo Red (anionic). Surface area and Scanning Electron Microscopy (SEM) were also conducted. Surface chemistry was impacted by corona treatment and interfered in dye adsorption. There was decrease of dye adsorption for both dyes according to time exposure. However, the decrease of Methylene Blue (25%) was higher than Congo Red (14%), suggesting that either charge or molecule weight interfere in the adsorption isotherms. In kinetic adsorption, there was no difference between treatments, although there was a difference in adsorption equilibrium. SEM showed that surface was impacted (pore destruction) by corona treatment. Furthermore, estimated surface area was strongly impacted by the treatment, reducing with the increase of time exposure. Thus, textural properties might have contributed to reduce adsorption capacity of both dyes and play a higher role than chemical properties.

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Zhang, Ying, Kai Xia, Xin Liu, Zhaojun Chen, Hui Du, and Xiaodong Zhang. "Synthesis of cationic-modified silica gel and its adsorption properties for anionic dyes." Journal of the Taiwan Institute of Chemical Engineers 102 (September 2019): 1–8. http://dx.doi.org/10.1016/j.jtice.2019.05.005.

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Guo, Jing, Jiankun Wang, and Guo Zheng. "Synthesis of cross-linking cationic starch and its adsorption properties for reactive dyes." IOP Conference Series: Earth and Environmental Science 227 (March 2, 2019): 062034. http://dx.doi.org/10.1088/1755-1315/227/6/062034.

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Ma, Wei, Mei Meng, Shu Fen Zhang, Ben Zhi Ju, and Min Zhang. "Application Mechanism and Performance of Cationic Native Starch and Cationic Hydrolyzed Starch in Salt-Free Dyeing of Reactive Dyes." Applied Mechanics and Materials 161 (March 2012): 212–16. http://dx.doi.org/10.4028/www.scientific.net/amm.161.212.

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Cationic native starch (CNS) and cationic hydrolyzed starch (CHS) were investigated in physical modification of cotton to realize salt-free dyeing of reactive dyes and their application properties were compared. Adsorption isotherm studies of C.I. Reactive Red 2 on the modified cotton presented the dyeing followed Langmuir-type model. The dyeing properties of the fibers modified with CNS and CHS were investigated and compared. The results showed the dye fixation and fastness properties of both C.I. Reactive Red 2 and C.I. Reactive Blue 19 on CNS modified cotton were inferior to that on the untreated and CHS modified ones.

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Kudaibergenov, Sarkyt. "Physicochemical, Complexation and Catalytic Properties of Polyampholyte Cryogels." Gels 5, no. 1 (2019): 8. http://dx.doi.org/10.3390/gels5010008.

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Polyampholyte cryogels are a less considered subject in comparison with cryogels based on nonionic, anionic and cationic precursors. This review is devoted to physicochemical behavior, complexation ability and catalytic properties of cryogels based on amphoteric macromolecules. Polyampholyte cryogels are able to exhibit the stimuli-responsive behavior and change the structure and morphology in response to temperature, pH of the medium, ionic strength and water–organic solvents. Moreover, they can uptake transition metal ions, anionic and cationic dyes, ionic surfactants, polyelectrolytes, proteins, and enzymes through formation of coordination bonds, hydrogen bonds, and electrostatic forces. The catalytic properties of polyampholyte cryogels themselves and with immobilized metal nanoparticles suspended are outlined following hydrolysis, transesterification, hydrogenation and oxidation reactions of various substrates. Application of polyampholyte cryogels as a protein-imprinted matrix for separation and purification of biomacromolecules and for sustained release of proteins is demonstrated. Comparative analysis of the behavior of polyampholyte cryogels with nonionic, anionic and cationic precursors is given together with concluding remarks.

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Makarov, Dmitry A., Olga A. Yuzhakova, Ludmila K. Slivka, et al. "Cationic Zn and Al phthalocyanines: synthesis, spectroscopy and photosensitizing properties." Journal of Porphyrins and Phthalocyanines 11, no. 08 (2007): 586–95. http://dx.doi.org/10.1142/s1088424607000680.

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Several Zn (II) and Al (III) phthalocyanines bearing eight or sixteen positive charges on substituents of different structure have been prepared. Synthesized polycationic phthalocyanines have been studied in aqueous and alcoholic media by UV-vis spectroscopy and tested for their efficacy in singlet oxygen photosensitization. It has been found that a minor structural modification at the periphery of the photosensitizer allows control over its key features such as singlet oxygen generation due to specific intermolecular interactions in solution. The efficacy of polycationic phthalocyanines to sensitize tryptophan photobleaching in aqueous media and inactivation of bacteria in sewage water is also structure-dependent. Among the complexes studied, two dyes - zinc octakis(pyridiniomethyl)- and octakis[ N -(2-hydroxyethyl)- N , N -dimethylammoniomethyl]substituted phthalocyanines - are the best sensitizers and have high potential for photodynamic applications.

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Obłoza, Magdalena, Łukasz Łapok, Tomasz Pędziński, Katarzyna M. Stadnicka, and Maria Nowakowska. "Synthesis, Photophysics and Redox Properties of Aza‐BODIPY Dyes with Electron‐Donating Groups." ChemPhysChem 20, no. 19 (2019): 2482–97. http://dx.doi.org/10.1002/cphc.201900689.

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