Academic literature on the topic 'Diffusion - Organic Dyes'

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Journal articles on the topic "Diffusion - Organic Dyes"

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Chenyakin, Yuri, Dagny A. Ullmann, Erin Evoy, Lindsay Renbaum-Wolff, Saeid Kamal, and Allan K. Bertram. "Diffusion coefficients of organic molecules in sucrose–water solutions and comparison with Stokes–Einstein predictions." Atmospheric Chemistry and Physics 17, no. 3 (2017): 2423–35. http://dx.doi.org/10.5194/acp-17-2423-2017.

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Abstract. The diffusion coefficients of organic species in secondary organic aerosol (SOA) particles are needed to predict the growth and reactivity of these particles in the atmosphere. Previously, viscosity measurements, along with the Stokes–Einstein relation, have been used to estimate the diffusion rates of organics within SOA particles or proxies of SOA particles. To test the Stokes–Einstein relation, we have measured the diffusion coefficients of three fluorescent organic dyes (fluorescein, rhodamine 6G and calcein) within sucrose–water solutions with varying water activity. Sucrose–wat
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Klučáková, Martina. "Effect of Chitosan as Active Bio-colloidal Constituent on the Diffusion of Dyes in Agarose Hydrogel." Gels 9, no. 5 (2023): 395. http://dx.doi.org/10.3390/gels9050395.

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Agarose hydrogel was enriched by chitosan as an active substance for the interactions with dyes. Direct blue 1, Sirius red F3B, and Reactive blue 49 were chosen as representative dyes for the study of the effect of their interaction with chitosan on their diffusion in hydrogel. Effective diffusion coefficients were determined and compared with the value obtained for pure agarose hydrogel. Simultaneously, sorption experiments were realized. The sorption ability of enriched hydrogel was several times higher in comparison with pure agarose hydrogel. Determined diffusion coefficients decreased wit
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Smilek, Jiří, Michal Kalina, Marcela Laštůvková, Irena Türkeová, Petr Sedlacek, and Martina Klučáková. "Reactivity-Mapping Tool Based on Diffusion Techniques for Characterization of Biocolloids." Materials Science Forum 851 (April 2016): 130–34. http://dx.doi.org/10.4028/www.scientific.net/msf.851.130.

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The universal reactivity-mapping tool was developed for characterization and study on barrier properties of selected biopolymers. The reactivity of biocolloids (humic acids) was studied by both diffusion techniques (break-through diffusion technique and non-stationary diffusion). The rate of reactivity of humic acids was compared by the interactions with basic cationic organic dye (Methylene Blue) because of the positive interactions among anionic supramolecular humic acids and cationic organic dyes were expected. The reactivity and barrier properties of biocolloids were compared by determinat
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Dey, Shantanu, Ujjwal Mandal, Supratik Sen Mojumdar, Amit Kumar Mandal, and Kankan Bhattacharyya. "Diffusion of Organic Dyes in Immobilized and Free Catanionic Vesicles." Journal of Physical Chemistry B 114, no. 47 (2010): 15506–11. http://dx.doi.org/10.1021/jp1068347.

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Dollendorf, Christian, Susanne Katharina Kreth, Soo Whan Choi, and Helmut Ritter. "Polymerization of novel methacrylated anthraquinone dyes." Beilstein Journal of Organic Chemistry 9 (February 28, 2013): 453–59. http://dx.doi.org/10.3762/bjoc.9.48.

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A new series of polymerizable methacrylated anthraquinone dyes has been synthesized by nucleophilic aromatic substitution reactions and subsequent methacrylation. Thereby, green 5,8-bis(4-(2-methacryloxyethyl)phenylamino)-1,4-dihydroxyanthraquinone (2), blue 1,4-bis(4-((2-methacryloxyethyl)oxy)phenylamino)anthraquinone (6) and red 1-((2-methacryloxy-1,1-dimethylethyl)amino)anthraquinone (12), as well as 1-((1,3-dimethacryloxy-2-methylpropan-2-yl)amino)anthraquinone (15) were obtained. By mixing of these brilliant dyes in different ratios and concentrations, a broad color spectrum can be genera
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Noskov, Yu V., V. N. Bliznyuk, and A. A. Pud. "POLYANILINE, HALLOYSITE NANOTUBES AND THEIR NANOCOMPOSITE AS ADSORBENTS FOR ORGANIC DYES." Polymer journal 45, no. 3 (2023): 221–31. http://dx.doi.org/10.15407/polymerj.45.03.221.

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This work is devoted to the study of the adsorption efficiency of methylene blue and methyl orange dyes by polyaniline base (PANI), halloysite nanotubes (HNTs), and their nanocomposite (HNTs/PANI). PANI and the nanocomposite were prepared by the chemical oxidative polymerization of aniline in the absence and presence of HNTs followed by subsequent dedoping by ammonia solution. The morphology and thermal stability of the adsorbents were explored. In particular, the TEM method showed that the nanocomposite consisted of practically non-agglomerated nanoparticles with a “core-shell” morphology. Pa
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Kadolkar, Prajakta S., Shivaraj A. Patil, Manjunath N. Wari, and Sanjeev R. Inamdar. "Rotational diffusion dynamics of Alexa flour dyes in aqueous organic environment." Journal of Molecular Liquids 312 (August 2020): 113452. http://dx.doi.org/10.1016/j.molliq.2020.113452.

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Cano, Francisco J., Odín Reyes-Vallejo, Rocío Magdalena Sánchez-Albores, et al. "Activated Biochar from Pineapple Crown Biomass: A High-Efficiency Adsorbent for Organic Dye Removal." Sustainability 17, no. 1 (2024): 99. https://doi.org/10.3390/su17010099.

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Renowned for its versatility in environmental applications, biochar exhibits substantial potential to enhance anaerobic digestion, facilitate carbon sequestration, and improve water treatment through its highly efficient adsorption mechanisms. This study focuses on biochar derived from pineapple crown biomass, produced through slow pyrolysis, and its efficiency in removing organic dyes from contaminated water. The structural, morphological, and surface properties of both biochar and chemically activated biochar samples were comprehensively characterized using a range of techniques, including X
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Ong, Pin Jin, Siok Wei Tay, and Liang Hong. "Removal of water-soluble dyes by conjugated organic skeletons through drainflow-diffusion filtration." Journal of Environmental Chemical Engineering 6, no. 4 (2018): 4612–22. http://dx.doi.org/10.1016/j.jece.2018.07.011.

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BALAKRISHNAN, JEYAGOWRI, and YAMUNA RANGAIYA THIAGARAJAN. "CHARACTERIZATION AND POTENTIAL SUITABILITY OF SIMAROUBA GLAUCA SEED SHELL LIGNOCELLULOSIC BIOMASS AS ADSORBENT OF BASIC DYES FROM AQUEOUS SOLUTIONS." Cellulose Chemistry and Technology 55, no. 5-6 (2021): 705–22. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.60.

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The present study investigates the potential of Simarouba glauca seed shell powder as a cost-effective adsorbent for the removal of the cationic dyes Malachite green (MG), Methylene blue (MB) and Rhodamine B (RB) from aqueous solutions. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD), as well as by Brunauer–Emmett–Teller (BET) and elemental (CHNS) analyses. Batch mode adsorption studies were carried out varying the experimental conditions, such as initial dye concentration and contact time, adsorb
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Dissertations / Theses on the topic "Diffusion - Organic Dyes"

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Ullmann, Dagny Anna. "Measurements of diffusion coefficients of organic dyes in proxies of atmospheric particles." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61969.

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Smilek, Jiří. "Nové metody studia reaktivity a transportních vlastností biokoloidů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-234657.

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The main aim of doctoral thesis was the study on reactivity, transport and barrier properties of biocolloidal and synthetic polymeric substances by simple diffusion techniques. It was studied mainly the influence of basic physic-chemical parameters (temperature, concentration, pH and modification of material) on the reactivity and barrier ability of chosen compounds. Further substances were chosen as a model compounds: biocolloids (humic acids, alginate, chitosan, hyaluronate) and synthetic polymer (polystyrenesulfonate). Reactivity, barrier and transport properties of chosen substances were s
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Nunes, Neto Oswaldo [UNESP]. "Estudo dos processos de transporte dependentes de Spin em materiais orgânicos." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/143066.

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Submitted by OSWALDO NUNES NETO null (netfisic@fc.unesp.br) on 2016-08-13T20:37:55Z No. of bitstreams: 1 Tese_Doutorado_Oswaldo.pdf: 4276326 bytes, checksum: e73a2086ffde0d12d2f5875fb168f8c1 (MD5)<br>Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-08-16T14:27:21Z (GMT) No. of bitstreams: 1 nunesneto_o_dr_bauru.pdf: 4276326 bytes, checksum: e73a2086ffde0d12d2f5875fb168f8c1 (MD5)<br>Made available in DSpace on 2016-08-16T14:27:21Z (GMT). No. of bitstreams: 1 nunesneto_o_dr_bauru.pdf: 4276326 bytes, checksum: e73a2086ffde0d12d2f5875fb168f8c1 (MD5)
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Kolesa, Pavel. "Studium interakcí barviv s biopolymerem chitosanem." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240577.

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This master's thesis was focused on the study of interaction of some organic azo dyes (model diffusion probes) with cationic biopolymer chitosan. This interactions were realized via diffusion processes in hydrogel media based on thermoreversible agarose. The main aim was study of influence of pH of solution on the diffusion process. Interactions of used dyes are based on electrostatic character. The aminogroup of chitosan interacts with the functional group of chosen dyes (anionic sulfonic group) and thus affects the process of diffusion. The model diffusion compounds were chosen organic anion
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Vezzoli, Massimiliano. "Intrinsic kinetics of titania photocatalysis : simplified models for their investigation." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/51574/1/Massimiliano_Vezzoli_Thesis.pdf.

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Even though titanium dioxide photocatalysis has been promoted as a leading green technology for water purification, many issues have hindered its application on a large commercial scale. For the materials scientist the main issues have centred the synthesis of more efficient materials and the investigation of degradation mechanisms; whereas for the engineers the main issues have been the development of appropriate models and the evaluation of intrinsic kinetics parameters that allow the scale up or re-design of efficient large-scale photocatalytic reactors. In order to obtain intrinsic kine
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PORTELLA, MARCIA TEREZA. "Spectroscopie coherente et etude d'un espace poreux par melange a quatre ondes." Paris 6, 1987. http://www.theses.fr/1987PA066586.

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Nous avons construit des lasers qui ont servi a des experiences de melange a quatres ondes (reseau transitoire). Nous avons d'abord etudie la reponse non lineaire du troisieme ordre lorsque le milieu presente un continuum large d'etats (colorants). Le signal obtenu sur le cresyl-violet en film mince de colle cellulosique a ete analyse. La technique du reseau transitoire a ete ensuite utilisee pour caracteriser la dynamique de molecules dans un milieu poreux (vycor) et etudier la geometrie des connexions entre pores. Nous avons etudie la rotation de l'azobenzene en solution soit libre soit cont
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Delatour, Thierry. "Mise en évidence par spectrométries optiques de formes tautomères caractéristiques d'un pyridylazo diethylaminophénol." Nancy 1, 1987. http://www.theses.fr/1987NAN10159.

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Étude des structures tautomériques du (bromo-5 pyridyl-2-azo)-2 diethylamino-5 phénol par spectrométrie ir, visible, d'émission visible et de diffusion raman de résonance. Attribution des transitions électroniques et vibrationnelles principales. Seules les structures quinoniques sont observées, la forme azo n'apparaissant pas en quantité détectable
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Ghosh, Shirsendu. "Study of Niosomes, Proteins and Live Cell using Fluorescence Correlation Spectroscopy and Microscopy." Thesis, 2019. http://hdl.handle.net/10821/8217.

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In this thesis, we have focused our attention on three different process, - diffusion of organic dyes, conformation dynamics of protein and solvation dynamics. Diffusion of organic dyes provides important information on the micro-viscosity and heterogeneity of the system. We have determined the diffusion coefficient and heterogeneity inside a niosome using fluorescence correlation spectroscopy. We also determined the micro-viscosity of different region of a live cell by measuring the diffusion coefficient of dyes in those regions. We studied the effect of solvent mixtures, such as binary mixtu
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Yang, Cheng-chung, and 羊振中. "Studies of Finite-Source Dye-Diffusion Thermal Transfer for Doping of Organic Light Emitting Diodes." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/77407633836766141666.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>88<br>Organic light emitting devices (OLEDs) based on molecular organic materials or polymer materials have been extensively studied because of their various merits suitable for flat panel display applications. The capability of solution processing of polymers leads to manufacturing advantage for large-area coating. However, it is found difficult to integrate multicolor polymer materials or devices for full-color displays by conventional coating and sequential photolithography steps. To resolve this issue, printing approaches have been aggressively pursued recent
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Book chapters on the topic "Diffusion - Organic Dyes"

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"Textile Dyes (excluding Reactive Dyes)." In Colour Chemistry, 2nd ed. The Royal Society of Chemistry, 2014. http://dx.doi.org/10.1039/bk9781849733281-00168.

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In contrast to the application of pigments, involving mechanical anchoring of discrete solid particles in a polymeric matrix, dyeing relies on equilibrium processes involving diffusion or sorption of dye molecules or ions within the substrate. Dyes are used in the coloration of a wide range of substrates including paper, leather and plastics, but by far their most important outlet is textiles. Textile fibres may be classified into three broad groups: natural, semi-synthetic and synthetic. These fibres share the common feature that they are made up of polymeric organic molecules; however, the p
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Conference papers on the topic "Diffusion - Organic Dyes"

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West, D., D. L. Williams, T. A. King, Z. Ali-Adib, P. Hodge, and D. Dunne. "Dependency of Sidechain Chromophore Orientations on Langmuir-Blodgett Polymer Structures." In Organic Thin Films for Photonic Applications. Optica Publishing Group, 1995. http://dx.doi.org/10.1364/otfa.1995.md.8.

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The LB technique allows optical chromophores to be placed within a predetermined series of organic molecular layers. Moreover, the orientations of the chromophores can be controlled when they are positioned in the apolar tail sections of the amphiphiles that are used. The fragility, the tendency to reorganise and even the diffusion mobility of dyes included in an LB film may be greatly reduced if polymeric materials are used. In addition to thermal and mechanical stability, polymers offer an amorphous structure in the plane of the film layers with a reduction in optical scatter relative to mon
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Hewagama, H. L., G. M. T. K. Somarathna, L. Herath, and S. E. Peiris. "Living Colours: Development of Microbial Culture Collection for Use as Microbial Colour Pigments in Textile Dyes." In SLIIT International Conference on Advancements in Sciences and Humanities 2023. Faculty of Humanities and Sciences, SLIIT, 2023. http://dx.doi.org/10.54389/ccoj7801.

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The textile industry is one of the largest worldwide polluters of clean water due to the heavy use of synthetic dyes. Synthetic dyes are harmful to aquatic life and to human health. To overcome this, natural dyes are being explored as a healthier and more eco-friendly alternative. Several advantages such as ease of extraction, availability, high yields and no seasonal variation make microbial pigments the most ideal source of natural pigments. This study was done to isolate colour pigment producing bacteria and fungi from soil collected from organic farms from various locations in Sri Lanka. I
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Horie, Kazuyuki. "New Mechanisms and New Systems of Hole Formation in Spectral Hole Burning." In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.thf1.

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A variety of studies on persistent spectral hole burning (PSHB) have been carried out for the last twenty years [1-4], since the discovery of this phenomenon in 1974. The elucidation of electron-phonon interaction, the nature of a zero-phonon line and spectral diffusion in PSHB have been studied intensively together with the research aiming at its possible applicability to ultra-high density optical storage. However, as for the PSHB materials, most of the works have been carried out with porphyrins, phthalocyanines, and quinizarin including their derivatives, several organic dyes, samarium and
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Sakoda, Kazuaki, and Masayuki Maeda. "Spectral Diffusion in Dye-Doped Deuterated Polymers." In Spectral Hole-Burning and Luminescence Line Narrowing: Science and Applications. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.pd7.

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The spectral diffusion In dye-doped organic glasses has been one of the most attracting subjects in the field of persistent hole burning spectroscopy. However, the microscopic detail of the mechanism is usually unknown. In this study, we try to clarify it by means of the comparison between deuterated and protonated hydrogen bonding polymers.
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Wilkosz, Aaron, and Sergey Sarkisov. "Beam Splitting in Nonlinear Polymeric Waveguide Induced by Photobleaching." In Organic Thin Films for Photonic Applications. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/otfa.1997.the.12.

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Optical beam splitting has been first reported for photorefractive waveguides built by titanium diffusion in LiNbO3 [1,2]. The effect has been qualitatively explained as an appearance of spatial dark solitons in self-defocusing nonlinear medium [3]. Optical splitting has also been observed in pure self-defocusing Kerr media in a two dimensional configuration [4,5] similar to that of a slab waveguide. The splitting effect in this case is apparently associated with dark spatial solitons. This paper presents theoretical and experimental data and discusses a theoretical model developed to study op
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Curran, K., and M. Davies. "Spectral Intensity Mapping and Analysis of Dyed Microflows." In ASME 2004 2nd International Conference on Microchannels and Minichannels. ASMEDC, 2004. http://dx.doi.org/10.1115/icmm2004-2333.

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The objective of this work is to develop simple reliable software to observe and quantify diffusion phenomena in microfluidic devices. One of the great advantages of microfluidic technology is that it permits the flow and diffusion of multiple streams in a single channel. The accurate control of a diffusion-based process has applications in bio-analytical chemistry, production of organic compounds and combinatorial chemistry. This method has been discussed in the literature as Laminar Fluid Diffusion Interface technology. It is heavily dependant on the controlled and reproducible introduction
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Tsuchiya, Jun, Jun-ichi Takahashi, and Hiroshi Tanaka. "Free Volume Model of Thermally Induced Spectral Diffusion." In Persistent Spectral Hole Burning: Science and Applications. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pshb.1991.the15.

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An organic dye/polymer system, such as free base phthalocyanine (H2Pc) dispersed in polymethylmethacrylate (PMMA), has been interested in as a model material of new mass-storage for photochemical hole burning (PHB)[1]. There are, however, some unsolved problems in applying it to a plactical memory system. That is, the influence of polymers as a matrix over the static and dynamic properties of the system, such as, thermally induced spectral diffussion (TISD), homogeneous and inhomogeneous line width, burning efficiency and so on, has not been solved yet. TISD among them has a strong correlation
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Mao, Xiaole, Sung Yang, and Jeffrey D. Zahn. "Experimental Demonstration and Numerical Simulation of Organic-Aqueous Liquid Extraction Enhanced by Droplet Formation in a Microfluidic Channel." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16084.

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Organic-aqueous (phenol) liquid extraction is one of the commonly used DNA purification methods. Effective mass transfer of biological material between the discrete fluid phases is key to achieving efficient extraction when designing microfluidic devices based on this technique. In the microscale regime, mass transfer is often diffusion limited. However, mass transfer can be enhanced through the formation of discrete droplets within a microchannel, which leads to a recirculation flow pattern within the droplet. This recirculation increases the mass transfer rate of material to the organic-aque
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Morales, Mercedes C., and Jeffrey D. Zahn. "Development of a Diffusion Limited Microfluidic Module for DNA Purification via Phenol Extraction." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68086.

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Purification of Deoxyribonucleic acid (DNA) by organic-aqueous liquid extraction, also called phenol extraction, is a standard technique commonly utilized in biology laboratories. In order to minimize interaction energies, membrane components and proteins naturally partition to the organic (phenol) phase while the DNA stays in the aqueous phase, where it can be easily removed. In recent years, microfluidics has become a driving force toward more efficient and autonomous platforms for fluid based diagnostics, chemical reaction chambers, separation and preparation of biological materials. In thi
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Molaire, M. F. "The Influence of Melt Viscosity on the Writing Sensitivity of Organic Dye-Binder Optical-Disk Recording Media." In Optical Data Storage. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/ods.1987.tha4.

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The object of this work was to determine the relationship between writing sensitivity of organic dye-binder media and media melt viscosity. Writing sensitivity was defined as the recording response against writing laser power. That response was measured by the electronic readout of the recorded pits. As a theoretical framework, the mechanism of hole formation espoused by Wrobel et al. (1) was assumed. That is, pit formation was considered to be essentially a flow process in which the primary driving force is back pressure due to limited material ablation and decomposition. Thus it was believed
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