Bibliographies thématiques / Different aqueous media

Littérature scientifique sur le sujet « Different aqueous media »

Auteur : Grafiati
Publié le 18 mai 2024

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Articles de revues sur le sujet "Different aqueous media"

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Boberič, Gordana, Oliver Bajt, Boris Šket et Jadran Faganeli. « Photochemical degradation of butyl acrylate in different aqueous media ». Chemosphere 37, no 1 (juillet 1998) : 33–40. http://dx.doi.org/10.1016/s0045-6535(98)00036-8.

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Nguyen, Huu Van, Son Tung Luu et E. G. Rakov. « Solubility of Functionalized Carbon Nanofibers in Different Aqueous Media ». Fullerenes, Nanotubes and Carbon Nanostructures 20, no 4-7 (mai 2012) : 429–33. http://dx.doi.org/10.1080/1536383x.2012.655552.

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Karg, Matthias, Natascha Schelero, Claudia Oppel, Michael Gradzielski, Thomas Hellweg et Regine von Klitzing. « Versatile Phase Transfer of Gold Nanoparticles from Aqueous Media to Different Organic Media ». Chemistry – A European Journal 17, no 16 (23 mars 2011) : 4648–54. http://dx.doi.org/10.1002/chem.201003340.

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Amini-Fazl, Mohammad Sadegh, Hamid Mobedi et Jalal Barzin. « Investigation of aqueous stability of taxol in different release media ». Drug Development and Industrial Pharmacy 40, no 4 (17 avril 2013) : 519–26. http://dx.doi.org/10.3109/03639045.2013.771646.

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Müller, B. « Corrosion inhibition of different metal pigments in aqueous alkaline media ». Corrosion Science 43, no 6 (juin 2001) : 1155–64. http://dx.doi.org/10.1016/s0010-938x(00)00134-7.

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Gouda, Abdelaziz, Francesca Soavi et Clara Santato. « Eumelanin electrodes in buffered aqueous media at different pH values ». Electrochimica Acta 347 (juillet 2020) : 136250. http://dx.doi.org/10.1016/j.electacta.2020.136250.

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Alva-Ensastegui, J. C., M. Palomar-Pardavé, M. Romero-Romo et M. T. Ramírez-Silva. « Quercetin spectrofluorometric quantification in aqueous media using different surfactants as fluorescence promoters ». RSC Advances 8, no 20 (2018) : 10980–86. http://dx.doi.org/10.1039/c8ra01213j.

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Michałowska-Kaczmarczyk, Anna M., et Tadeusz Michałowski. « Evaluation of Transition Points between Different Solid Phases in Aqueous Media ». Journal of Analytical Sciences, Methods and Instrumentation 04, no 03 (2014) : 87–94. http://dx.doi.org/10.4236/jasmi.2014.43012.

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Khorfan, S., J. Stas et M. Kassem. « Stripping of uranium from Dehpa/kerosene solvents by different aqueous media ». Journal of Radioanalytical and Nuclear Chemistry 238, no 1-2 (décembre 1998) : 145–48. http://dx.doi.org/10.1007/bf02385370.

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Nazari, Babak, Zahra Ranjbar, Ra’na Rafiei Hashjin, Amir Rezvani Moghaddam, Gelareh Momen et Behnaz Ranjbar. « Dispersing graphene in aqueous media : Investigating the effect of different surfactants ». Colloids and Surfaces A : Physicochemical and Engineering Aspects 582 (décembre 2019) : 123870. http://dx.doi.org/10.1016/j.colsurfa.2019.123870.

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Thèses sur le sujet "Different aqueous media"

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Sharahili, Nasser. « Atom Transfer Radical Polymerization in Aqueous Media Using Different Water-Soluble Initiators and Ligands ». Thesis, 2020. http://hdl.handle.net/10754/664346.

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Abstract: Styrene and methyl methacrylate have been polymerized successfully through atom transfer radical polymerization (ATRP) in aqueous dispersed media (emulsion ATRP). The thesis is divided into four experimental parts. In the first part, a water-soluble initiator was prepared for emulsion ATRP and utilized under various conditions in the presence of two ligands N, N, N’, N’’, N’’-Pentamethyldiethylenetriamine and 2,2’-bipyridine to attain activation/deactivation only in the oil phase with Tween 20 as a non-ionic surfactant. The initiator was synthesized by the reaction of diethanolamine with α-Bromoisobutyryl bromide in anhydrous tetrahydrofuran. 1H NMR spectroscopy (500 MHz, deuterium oxide, or chloroform-d) was performed to confirm the successful synthesis of the initiator and polystyrenes. In the second and third parts, two commercial initiators were used, poly(ethylene glycol) methyl ether 2-bromoisobutyrate (Mn= 2000 g/mol), and 2-hydroxyethyl 2-bromoisobutyrate (Mn= 211.05 g/mol). BPY, tris(2-pyridylmethyl) amine and 4, 4’-dinonyl -2, 2’-dipyridyl were used as the ligands with various molar ratios. Polyoxyethylene (80) sorbitan monooleate, and polyoxyethylene (20) oleyl ether were used as non-ionic surfactants. In the fourth part, a macroinitiator was synthesized by the reaction of polyoxyethylene (20) stearyl ether with α-Bromoisobutyryl bromide. The formation of the macroinitiator as well as the successful synthesis of poly(ethylene glycol)-b-polystyrene, and poly(ethylene glycol)-b-poly(methyl methacrylate) block copolymers were confirmed by Fourier transform infrared and 1H NMR spectroscopies. The molecular weight of the resulting polymers, as well as the stability of the emulsion systems, were evaluated by gel permeation chromatography and dynamic light scattering, respectively.
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Livres sur le sujet "Different aqueous media"

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Tércio, Daniel, dir. TEPe 2022 - Encontro Internacional sobre a Cidade, o Corpo e o Som. INET-md, Faculdade de Motricidade Humana, Universidade de Lisboa, 2022. http://dx.doi.org/10.53072/ilic8040.

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Os contextos pandémico e pós-pandémico vêm impondo às cidades outras dinâmicas, outros sons, outros ecos, outros percursos, outros visitantes humanos e não humanos. Durante o confinamento, o encerramento de espaços teatrais e expositivos – bem como, durante o desconfinamento, as limitações para a sua utilização - têm tido consequências penosas nas programações artísticas e efeitos dramáticos nos quotidianos dos seus agentes (artistas, técnicos, programadores, curadores, etc.). Ao mesmo tempo, a desaceleração da vida da cidade (do trânsito, do ritmo nas ruas, do frenesim produtivo e de consumo, etc.) veio contribuir beneficamente para uma diminuição das emissões de CO2. Neste quadro, a cidade - mais concretamente as suas zonas públicas a céu aberto – surgem mais nitidamente como espaços de circulação e de interferência (ou de suspensão de interferência) entre pessoas. O que aprendemos com a experiência de confinamento e desconfinamento? Em primeiro lugar, que a cidade tem uma densidade flutuante, na medida em que as concentrações populacionais se esvaem quando nos encerramos em casa. Em segundo lugar, que o encontro com o outro (uma das prerrogativas da cidade) pode acontecer em outras escalas que não apenas a dimensão cultural. Em terceiro lugar, que o medo pode ser um sentimento público capaz de fazer implodir as próprias cidades, se não for transformado numa força para a vida. Como é que, neste processo, os artistas se organizam e se constituem como agentes na cidade? Como é que a cidade passou a ser representada? Que cidade é aquela que desejamos? Este congresso surge assim da necessidade de intensificar o diálogo entre a cidade e a arte, em particular as artes performativas. Este encontro efoi o culminar de dois anos de investigação consistente e consolidada no âmbito do projecto TEPe (Technologically Expanded Performance). Ao longo destes dois anos, desenvolvemos atividades com a comunidade com o intuito de promover um diálogo intercultural e transdisciplinar, e proporcionar o encontro com vivências urbanas variadas. Através das diferentes propostas de percursos pela cidade, mapeámos acontecimentos, hoje invisíveis, mas ainda assim presentes: desde “memórias soterradas” a “caminhadas sensoriais”, passando por registos íntimos de confinamento. O encontro visou partilhar as experiências realizadas com a contribuição de duas equipas: a portuguesa, em Lisboa, e a brasileira, em Fortaleza. Para além de apresentarmos as conclusões das pesquisas realizadas, lançamos esta chamada para apresentações, especialmente destinada a artistas e estudiosos de performance art, historiadores das cidades, antropólogos, urbanistas, geógrafos, estudiosos da escuta e do som e a todxs aquelxs a quem interessa pensar (e projectar) a vida na cidade. -------------------------------------------------------------------------------------------------------------- The pandemic and post-pandemic contexts have imposed on cities other dynamics, other sounds, other echoes, other routes, other human and non-human visitors. During the lockdown, the closure of theatrical and exhibition spaces - as well as, during lockdown unlocking, the limitations for their use - have had painful consequences in artistic programming and dramatic effects in the daily lives of its agents (artists, technicians, programmers, curators, etc.). At the same time, the slowing down of city life (traffic, the pace of the streets, the frenzy of production and consumption, etc.) has made a beneficial contribution to a reduction in CO2 emissions. In this context, the city - and more specifically its open-air public areas - emerge more clearly as spaces for circulation and interference (or suspension of interference) between people. What have we learned from the experience of national lockdown and unlocking? Firstly, that the city has a fluctuating density, insofar as population concentrations fade when we shut ourselves indoors. Secondly, the encounter with the other (one of the prerogatives of the city) can take place on other scales than the cultural dimension alone. Thirdly, fear can be a public sentiment capable of imploding cities themselves if it is not transformed into a force for life. How, in this process, are artists organised and constituted as agents in the city? How did the city come to be represented? What kind of city do we want? This congress thus arises from the need to intensify the dialogue between the city and art, particularly the performing arts. This international meeting is the culmination of two years of consistent and consolidated research within the TEPe (Technologically Expanded Performance) project. Throughout these two years, we have developed activities with the community to promote intercultural and transdisciplinary dialogue and provide an encounter with varied urban experiences. Through the different proposals of walks through the city, we have mapped events, today invisible, but still present: from "buried memories" to "sensorial walks", passing through intimate records of confinement. The meeting aims to share the experiences carried out with the contribution of two teams: the Portuguese, in Lisbon, and the Brazilian, in Fortaleza. Besides presenting the conclusions of the researches carried out, we launch this call for presentations, especially addressed to artists and scholars of performance art, historians of cities, anthropologists, urban planners, geographers, scholars of listening and sound and to all those who are interested in thinking (and projecting) life in the city.
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Chapitres de livres sur le sujet "Different aqueous media"

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Käiväräinen, Alex I. « Interactions between Macromolecules of Different Types and Proteins and Cells in Aqueous Media ». Dans Solvent-Dependent Flexibility of Proteins and Principles of Their Function, 238–53. Dordrecht : Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5197-6_8.

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Davoodabadi, Maliheh, Marco Liebscher, Massimo Sgarzi, Leif Riemenschneider, Daniel Wolf, Silke Hampel, Gianaurelio Cuniberti et Viktor Mechtcherine. « Electrical and Sulfate-Sensing Properties of Alkali-Activated Nanocomposites ». Dans Lecture Notes in Civil Engineering, 285–96. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_29.

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AbstractWe investigated the formation of the conductive network of carbon nanotubes (CNTs) in alkali-activated nanocomposites for sulfate-sensing applications. The matrix was a one-part blend of fly ash and ground granulated blast-furnace slag, activated by sodium silicate and water. Sodium dodecylbenzenesulfonate was used as the surfactant for dispersion of the CNTs in the aqueous media. The nanocomposites were investigated by a laboratory-developed setup to study the electrical and sensing properties of the alkali-activated material. The electrical properties (i.e., conductivity) were calculated and assessed to discover the percolation threshold of the nanocomposites. Furthermore, the sensing behavior of nanocomposites was studied upon sulfate ($${\mathrm{SO}}_{4}^{2-}$$ SO 4 2 - ) exposure by introduction of sulfuric acid ($$({\mathrm{H}}_{2}{\mathrm{SO}}_{4})$$ ( H 2 SO 4 ) ) and magnesium sulfate ($${\mathrm{MgSO}}_{4}$$ MgSO 4 ). The sensors were able to preliminarily exhibit a signal difference based on the introduced media ($${\mathrm{H}}_{2}{\mathrm{SO}}_{4} \&\mathrm{ Mg}{\mathrm{SO}}_{4}$$ H 2 SO 4 & Mg SO 4 ), CNT content and $${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$$ H 2 SO 4 volumetric quantity. The results of this research demonstrated a sensing potential of CNT alkali-activated nanocomposites and can be applied in the concrete structural health monitoring.
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« Different Approaches for Interpreting Contact Angles and Determining the Surface Tension and Surface Tension Components of Solids ». Dans Interfacial Forces in Aqueous Media, Second Edition, 165–78. CRC Press, 2006. http://dx.doi.org/10.1201/9781420015768.ch14.

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Alcántara, A. R., J. V. Sinisterra, C. Torres, J. M. Guisán, M. H. Gil et A. Williams. « Peptide Synthesis in Organic-Aqueous Media Catalysed by α-Chymotrypsin Immobilised Over Different Supports ». Dans Progress in Biotechnology, 443–50. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89046-7.50066-7.

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Allcock, Harry R. « Polyphosphazenes ». Dans Polymer Data Handbook, 938. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195181012.003.0162.

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Abstract There are more that 700 different polyphosphazenes known, all of which have different engineering properties. Applications have been developed as hydrophobic and superhydrophobic materials, hydrogels, optical and photonic materials, solid and gel polymer electrolytes, high performance elastomers, membranes, and as fire resistant materials. Most are stable in the atmosphere and to aqueous media, and a few are bioerodible via hydrolysis mechanisms and are the basis of tissue engineering and drug delivery procedures.
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Mate, C. Mathew, et Robert W. Carpick. « Physical Origins of Surface Forces ». Dans Tribology on the Small Scale, 181–233. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199609802.003.0007.

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The energies and forces between contacting surfaces originate from the interaction forces between atoms and molecules. This chapter discusses how these atomic level forces lead to various types of force–separation relations as two surfaces are brought into contact. This chapter covers the interactions between atoms (repulsive atomic potentials and van der Waals interactions), the interactions within liquid and aqueous media (solvation forces, electrostatic double layer, hydration repulsion, hydrophobic attraction), and electrostatic interactions from contact electrification. Due to their ubiquitous effect on adhesion, van der Waals interactions are discussed at length, including examples for calculating adhesive forces in different geometries using Hamaker constants.
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María José Santillán, Jesica, David Muñetón Arboleda, Valeria Beatriz Arce, Lucía Beatriz Scaffardi et Daniel Carlos Schinca. « A Simple and “Green” Technique to Synthesize Metal Nanocolloids by Ultrashort Light Pulses ». Dans Colloids - Types, Preparation and Applications [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94750.

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In this chapter Ag, Ni and Fe nanocolloids synthesized by “green” ultrashort pulse laser ablation of solid metal targets using different pulse energies and liquid media are characterized by different techniques. Optical extinction spectroscopy (OES), micro-Raman spectroscopy (MRS), transmission electron microscopy (TEM) and electron diffraction (ED) were independently used to analyze optical, morphological and compositional properties of the generated nanocolloids. In a deeper way, the stability characteristics of Ag nanocolloids in aqueous solutions with different stabilizers were studied owing to their potential use in biocompatible compounds. Besides, due to their interesting applications, few atoms Ag nanoclusters (NCs) were synthesized using the same ablation technique, analyzing their fluorescent and photocatalytic properties. On the other hand, to expand the characterization of the nanocolloids, their magnetic behavior was inspected for the Ni and Fe by vibrating sample magnetometry (VSM).
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Yurekli, Yilmaz. « Principles of Membrane Surface Modification for Water Applications ». Dans Wastewater Treatment [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96366.

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Membrane technologies offer efficient and reliable solutions to separate components from aqueous media. Among them, pressure driven membrane separation processes namely microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) have been preferred in many industrial operations (food, pharmaceutical, chemical, drinking water, wastewater) due to the intrinsic advantages such as high selectivity, stability, ecocompatibility, scalability, flexibility, small footprint and low operational cost. This chapter will focus on the latest developments of surface modified polymeric membranes via the Layer-by-layer self-assembly approach and incorporation/decoration of nanomaterials. Variable parameters including size and charge of polyelectrolyte, ionic strength of the media, number of bilayers, and different types of nanomaterials on the bulk and surface property, water permeability, selectivity, antifouling, antibacterial, and adsorptive properties of the resultant composite membranes will be reviewed by comparison with the neat membranes. Membrane stability in terms of throughput and rejection characteristics during long-term filtrations will be addressed in this chapter.
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T. Galatage, Sunil, Rahul Trivedi, Durgacharan A. Bhagwat, Arehalli S. Manjappa, Swapnil S. Harale, Abhinandan A. Alman, Swapnil S. Chopade et al. « Self-nano Emulsifying Formulations : An Encouraging Approach for Bioavailability Enhancement and Future Perspective ». Dans Dosage Forms [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108703.

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Currently lipid-based formulations are playing a vital and promising role in improving the oral bioavailability of poorly water-soluble drugs. Lipid based formulations mainly consist of a drug dissolved in lipids such as triglycerides, glycerides, oils and surface active agent. Self nanoemulsifying formulations (SNEF) are isotropic mixtures of lipids/oils, surfactants and co-surfactants. On mild agitation followed by dilution in aqueous media, such as GI fluids, SNEF can form fine oil-in-water (o/w) nanoemulsions. Present chapter summarizes different types of lipid formulations with special emphasis on SNEF, availability of dosage forms, different components with natural surfactants from medicinal plants, mechanism of SNEF, recent advancements in oral drug delivery, solid SNEDDS, patents on SNEF and future prospects. SNEF emerging as powerful technique to improve solubility and commercialization of solid SNEF is the future novel drug delivery to improve bioavailability of poorly water soluble drugs.
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Patel, Preeti, Ashish K. Parashar, Monika Kaurav, Krishna Yadav, Dilpreet Singh, G. D. Gupta et Balak Das Kurmi. « Niosome : A Vesicular Drug Delivery Tool ». Dans Nanoparticles and Nanocarriers-Based Pharmaceutical Formulations, 333–64. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815049787122010014.

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Niosomes, which are well recognized for their non-ionic surfactant characteristics, are considered to be innovative drug delivery methods since they improve the solubility and stability of medicinal compounds when administered orally. It has been shown that niosome vesicles are closed bilayer structures that may exist in aqueous fluids and are produced by the self-assembly of different types of hydrated non-ionic surfactants and amphiphile monomers in aqueous media. Because the monomers maintain a wide range of kinetic activity inside the assembly, they are referred to as liquid crystal structures in terms of thermodynamics. It is just the total of different processes for the dispersion of monomers and solvents that results in the formation of the final systems. Niosomes are made up mostly of lipid molecules and nonionic surfactants, which are the two most important components in the process of making them. Nonetheless, as the name suggests, component surfactants play a key role in the creation of niosomes, owing to the fact that non-ionic surfactants were often employed to organize niosomes during their formation. They are especially well-suited for drug delivery because they have the ability to encapsulate medicines that are both lipophilic and hydrophilic in nature. These materials are appealing for a number of drug delivery goals, including drug targeting, controlled release, and permeability enhancement, because of their chemical stability, cheap production costs, and composed of biodegradable and non-immunogenic components. Niosomal vesicular carriers can also help to minimize problems such as physical and chemical instability. This book chapter contains a brief knowledge about structural components and integrity concerning the advanced method of noisome preparation. The characterization techniques essential for noisome have also been discussed in detail. The recent examples for different applications are also included for therapy /diagnostic purposes based on the route of administration and disease state.
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Actes de conférences sur le sujet "Different aqueous media"

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Peerzada, G. M., et Nadeem B. Ganaie. « Oscillatory behaviour of resorcinol with manganese salts in different aqueous acid media ». Dans 2010 2nd International Conference on Chemical, Biological and Environmental Engineering (ICBEE). IEEE, 2010. http://dx.doi.org/10.1109/icbee.2010.5653380.

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Guilemany, J. M., J. Fernández, J. Delgado et A. V. Benedetti. « Drawbacks in Corrosion Resistance of Thermal Spray Coatings in Aggressive Aqueous Media ». Dans ITSC2002, sous la direction de C. C. Berndt et E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0894.

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Abstract The growing use of thermal spray technology in manufacturing is increasing the need for knowledge regarding the behavior of thermal spray coatings in aggressive environments. Due to the different characteristics of the spraying processes and materials used, the mechanisms of attack can vary greatly from layer to layer depending on the application. This paper presents a detailed investigation of corrosion mechanisms at room temperature and their effect on a wide range of thermally sprayed metals and ceramic-metal (cermet) composites. Paper includes a German-language abstract.
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Zordão, Luis Henrique Pizetta, Lauralice de C. F. Canale et George E. Totten. « Investigation of Quenchants Based on Sodium Aqueous Ionic Solutions ». Dans HT2019. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.ht2019p0253.

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Abstract The mechanical properties of steel components are influenced by the microstructure, which is determined by the heat treatment cycle. In the quenching of the steel: water, oil, aqueous polymer solutions and aqueous salt solutions (brine) can be used as quenchants, which exhibit different characteristic cooling mechanisms. For example, when water is used as the cooling media, a stable vapor film is formed around the hot component resulting in nonuniformity of surface heat transfer during the cooling process, which is often responsible for distortion, and cracking. Using salt based on sodium (Na) as an additive forming a solution with distilled water was able to reduce or eliminate the vapor film, enhance the cooling rate and keep the heat flux in high values during the most part of the drop of the temperature that is better for a more homogeneous cooling. This work investigated the cooling performance of different salt solutions and quenching bath parameters (temperature and agitation). These analyses were made using cooling curves and heat flux to quantify the behavior and hardening power capacity of these salt solutions.
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Basilio, E., M. Addassi, T. Truscott et H. Hoteit. « CO2 Mass Transfer in Porous Media : Implications for Long-Term Carbon Sequestration in Saline Aquifers ». Dans International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23884-ms.

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Abstract Carbon sequestration in saline aquifers is considered a suitable alternative for reducing anthropogenic carbon dioxide (CO2) emissions into the atmosphere. As supercritical CO2 is injected into the subsurface, its density difference with the residing water causes a CO2 buoyant plume to overlay a water-saturated porous layer. The study of diffusive and convective mechanisms during CO2 sequestration in aquifers is paramount for understanding the effects of solubility trapping to determine the long-term fate of the injected CO2. We studied the CO2 dissolution in aqueous solutions in porous media by coupling two experimental techniques: (1) constant pressure method and (2) visualization tests. Each test was performed in a closed visualization cell for at least 36 hours. Capillary tubes filled with glass beads of specific grain sizes are saturated with pH-sensitive solutions. CO2 is continuously supplied into the visualization cell to keep the pressure of the system constant by compensating the gas mass transfer into the aqueous phase. The injected gas is monitored in real- time. Furthermore, as the CO2 mass transfer into the aqueous phase takes place, an acidic solution is created, altering the color of the pH-sensitive solution. The change in color is continuously monitored. Our experimental approach allowed us to study the mass transfer dynamics in two different conditions: (1) diffusive mass transfer with the aid of natural convection; (2) diffusive mass transfer with the isolation of density-driven convection. The diffusive mass transfer was described by measuring the velocity of the interface separating the gas and aqueous phases. Natural convection was characterized by the onset time of convection and flow dynamics. We studied the effects of salinity (NaCl) and the impact of grain size in porous media systems. Results show that as average grain size diameter decreases, natural convection has no enhancing effects on the dissolution process when compared to a diffusive mass transfer process alone. We observed that convection onset time increases as grain size decreases, which in turn, diminishes the mass flux of convection. Salinity has been observed to play an essential role in the convection onset time as it affects parameters such as density, effective molecular diffusivity (affected by pore size), and viscosity. This work introduces a novel experimental approach based on coupling pressure-driven and light transmission-driven techniques to evaluate the mass transfer of CO2 in aqueous solutions in porous media. Results obtained in this study are essential to assess solubility entrapment and its long-term storage integrity.
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Tartis, Michaelann S., Jan Marik, Azadeh Kheirolomoom, Rachel E. Pollard, Hua Zhang, Jinyi Qi, Julie L. Sutcliffe et Katherine W. Ferrara. « Pharmacokinetics of Encapsulated Paclitaxel : Multi-Probe Analysis With PET ». Dans ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176435.

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We have combined two imaging probes and used PET as a means to provide image-based validation for a novel targeted drug delivery system. The first probe was a direct labeling of the drug [18F]fluoropaclitaxel [1–3], which was inserted into various carrier vehicle formulations. The second probe, [18F]fluoro-1,2-dipalmitoyl-sn-glycerol, i.e. [18F]FDP involved radiolabeling the lipid vehicle. Paclitaxel, which is poorly soluble in aqueous media, also has limited solubility and stability in lipophilic environments such as liposomes. Stable association of paclitaxel with the lipid bilayer is affected by a variety of physicochemical factors such as temperature and liposome composition. Paclitaxel crystal formation has been documented, with two forms of solid state within aqueous media and organic solvents, although crystal conformation differs in each media [4,5]. We provide dynamic in vivo image sets providing biodistribution and time activity curves of free [18F]fluoropaclitaxel and liposomal [18F]fluoropaclitaxel as well as free [18F]FDP, liposomal [18F]FDP, and [18F]FDP in an ultrasound contrast agent. Serial studies were performed within a small group of rats, minimizing inter-animal variability. The two labeled molecules have different biodistributions: paclitaxel is rapidly taken up in the liver, intestines and kidneys, while the labeled lipid incorporated into liposomes stays in circulation with minimal uptake in organs other than spleen. Here, we have developed a quantitative method to follow paclitaxel and lipid vehicles to their destination in vivo in order to improve targeted paclitaxel delivery.
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Langanke, Nils, Thierry Leblanc, Ali Fadili, Rafael E. Hincapie et Leonhard Ganzer. « Flow of Viscoelastic Polymer Solutions in Porous Media : Influence of Molecular Weight and Dispersity ». Dans SPE EuropEC - Europe Energy Conference featured at the 84th EAGE Annual Conference & Exhibition. SPE, 2023. http://dx.doi.org/10.2118/214386-ms.

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Abstract The properties of polymeric materials are commonly modified by adjusting the dispersity of the molecular weight distribution, since polymer properties are dominated by intermolecular interactions. We utilized this approach to alter the rheological behavior of polymer solutions for application sub-surface and other porous media flow. We correlate the molecular weight distributions with screen factor measurements and in-situ rheological behavior. Aqueous solutions were prepared using mixtures of partially hydrolyzed polyacrylamide (HPAM) having different molecular weights. The behaviour of the solutions was studied in single-phase flooding experiments using Bentheimer and Berea outcrops, as well as a glass-silicon-glass microfluidic device that mimics porous media. The in-situ rheological behavior determined from flooding experiments was monitored by differential pressure measurements. To improve data accuracy, the core flooding experimental set-up was equipped with multiple pressure sensors along the core. Polymer solutions of same shear viscosity but significantly different dispersities were utilized for the investigation. Elongational viscosities were determined by screen factor measurements. We show that the apparent viscosity during polymer injection is significantly altered for polymer solutions of same average molecular weight but different dispersity. Namely, the onset of shear thickening occurs at lower equivalent shear rates when dispersity is high. Furthermore, the flow of polymer solutions in porous media was correlated to screen factor measurements. This effect of the dispersity of the molecular weight distribution can be used to optimize polymer solution applications in porous materials.
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Burlakovs, Juris, Ruta Ozola-Davidane et Maris Klavins. « INNOVATIVE COMPOSITE SORBENTS FOR ORGANIC AND INORGANIC POLLUTANTS REMOVAL FROM AQUEOUS SOLUTIONS IN LANDFILL LEACHATES ». Dans International Scientific Conference “EcoBalt 2021”. University of Latvia Press, 2021. http://dx.doi.org/10.22364/isceb.2021.01.

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The study reveals the development of appropriate innovative sorbents based on clay material for arsenic and p-nitrophenol sorption using iron oxy-hydroxide and surfactant modification. Natural and manufactured clay were chosen for comparison of modification efficiency to obtain the best sorption results for As (V) and p-nitrophenol. Obtained results indicate that modification of clay with iron compounds and various surfactants significantly improve the sorption capacity of newly developed materials used for sorption of inorganic and organic compounds from aqueous solutions in landfill leachates.Natural clay minerals have received a lot of attention as potential sorbents, because of their abundance, cost-effectiveness, high sorption and ion-exchange properties [1]. Clay minerals can be modified using different approaches to obtain innovative materials for application as sorbents in the removal of inorganic and organic pollutants from leachates, wastewater, groundwater and soil [2, 3]. Modification with surfactants improves hydrophobization needed if interaction with low polarity organic molecules is necessary, but chemical modification with inorganic species, e.g., hydrated iron supports the physical improvement of sorption and ion exchange process in order to benefit the treatment of media from inorganic pollutants [4]. Materials achieved better properties for specific remedial applications regarding heavy metals and metalloids, prepared organoclays from hydrophilic montmorillonite by intercalating cationic or nonionic surfactants can interact with organic molecules of differing polarity and serve as immobilizers for organic molecules and toxicants, e.g., phenols and NOCs. Further studies will reveal improved properties to benefit landfill leachate treatment, wastewater engineering and environmental remediation industries.
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Jen, Chun-Ping, et Neng-Chuan Tien. « Investigation of Colloid-Facilitated Effects on the Radionuclides Migration in the Fractured Rock With a Kinetic Solubility-Limited Dissolution Model ». Dans ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2010. http://dx.doi.org/10.1115/icem2010-40001.

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Nuclides can move with the groundwater either as solutes or colloids, where the latter mechanism generally results in much shorter traveling time as they interact strongly with solid phases, such as actinides. It is therefore essential to assess the relative importance of these two transport mechanisms for different nuclides. The relative importance of colloids depends on the nature and concentration of colloids in groundwater. Plutonium (Pu), neptunium (Np), uranium (U) and americium (Am) are four nuclides of concern for long-term emplacement of nuclear wastes at potential repository sites. If attached to iron oxide, clay or silica colloids in groundwater. Strong sorption of the actinides by colloids in groundwater may facilitate transport of these nuclides along potential flow paths. Solubility-limited dissolution model models can be used to determine the release of the safety assessment for nuclear waste in geological disposal sites. The present study investigates the effect of colloid on the transport of solubility limited nuclide under the kinetic solubility limited dissolution (KSLD) boundary condition in fractured media. The release rate of nuclide would proportional to the difference between the saturation concentration and the inlet aqueous concentration of nuclide. The presence of colloids could decrease the aqueous concentration of nuclide and thus could increase the release flux of nuclide from the waste form.
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Manoharan, Sanjivan, Milind A. Jog et Raj M. Manglik. « Effects of Liquid Viscosity on Bubble Growth From Submerged Orifice Plates ». Dans ASME 2017 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/ht2017-4885.

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Experimental investigation of bubble growth from orifice plates submerged in pools of viscous liquids has been carried out using high speed videography. Conflicting effects of viscosity on ebullience have been reported in the literature. These are addressed in the present study and their range of applicability has been identified. Furthermore, the effects of chamber volume on bubble dynamics in viscous media are examined. Orifice plates made of Acrylic glass (a hydrophilic surface) with varying orifice diameters from 0.813 mm to 1.500 mm, have been utilized. Additionally, bubble dynamics from a stainless steel capillary nozzle was captured and compared with that from orifice plates. The six different liquid pools were used, viz., pure distilled water, ethylene glycol, propylene glycol, and three different aqueous glycerol solutions. The aqueous glycerol solutions varied in viscosity from 48 cP to 128 cP. The flow rate was regulated such that the isolated bubble regime was encountered. For the smaller orifices, viscosity effects were present at all flow rates and the bubbles in water-glycerol solutions were much larger than those in pure water. However, for the larger orifice sizes, water-glycerol solutions produced bubbles that were larger than those in water only at high air flow rates. For larger orifice sizes, at low flow rates, there was no increase in bubble size in highly viscous water-glycerol solutions compared to pure water. In fact, with 1.5 mm diameter plate orifice, the bubbles for 128 cP water-glycerol solution were smaller than those in pure water at low air flow rates. When chamber effects were present, the bubbles in the more viscous medium differed in shape and size from those in pure water.
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Crnković, Marina, Jovana Šućur, Đorđe Malenčić et Suzana Jovanović-Šanta. « PROCENA OKSIDATIVNOG STRESA KUKURUZA I SUNCOKRETA TRETIRANIH HOLNOM KISELINOM U RAZLIČITIM MEDIJUMIMA – SKRINING TEST ». Dans XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.099c.

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The effect of cholic acid (CA) dissolved in two different media, namely Hogland nutrient solution and distilled water, on the oxidative stress of maize (Zea mays, L.) and sunflower (Helianthus annuus, L.) was assessed by measuring the intensity of lipid peroxidation. The aim of this screening is to observe possible differences in the results obtained from plants treated with an aqueous solution of cholic acid and those treated with a solution of cholic acid in Hogland's solution. Oxidative stress was assessed on the basis of the estimated intensity of lipid peroxidation (LP), and on the basis of the measured amount of the resulting LP final product, malondialdehyde (MDA). The results showed faster production of MDA in plants treated with cholic acid in Hogland's solution, which indicates that nutrients affect the action of CA.
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