Academic literature on the topic 'Nonpolar solvents'

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Journal articles on the topic "Nonpolar solvents"

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Roy, J. L., and W. B. McGill. "Flexible conformation in organic matter coatings: An hypothesis about soil water repellency." Canadian Journal of Soil Science 80, no. 1 (2000): 143–52. http://dx.doi.org/10.4141/s98-093.

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Some soils develop severe water repellency several years or decades following oil contamination. We previously reported that soil water repellency is completely eliminated by extraction with amphiphilic solvents, but barely reduced by extraction with nonpolar solvents. We report here on solvent-induced reversible soil water repellency. Our results indicate that: (i) water repellency is completely eliminated following extraction with amphiphilic solvent, but partially restored following subsequent exposure to nonpolar, non-H-bonding solvent; (ii) extraction with nonpolar, non-H-bonding solvent
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Saita, Satoshi, Shin-ichi Takeda, and Hideya Kawasaki. "Hansen Solubility Parameter Analysis on Dispersion of Oleylamine-Capped Silver Nanoinks and their Sintered Film Morphology." Nanomaterials 12, no. 12 (2022): 2004. http://dx.doi.org/10.3390/nano12122004.

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Optimizing stabilizers and solvents is crucial for obtaining highly dispersed nanoparticle inks. Generally, nonpolar (hydrophobic) ligand-stabilized nanoparticles show superior dispersibility in nonpolar solvents, whereas polar ligand (hydrophilic)-stabilized nanoparticles exhibit high dispersibility in polar solvents. However, these properties are too qualitative to select optimum stabilizers and solvents for stable nanoparticle inks, and researchers often rely on their experiences. This study presents a Hansen solubility parameter (HSP)-based analysis of the dispersibility of oleylamine-capp
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Pytela, Oldřich. "A new classification of solvents based on chemometric empirical scale of parameters." Collection of Czechoslovak Chemical Communications 55, no. 3 (1990): 644–52. http://dx.doi.org/10.1135/cccc19900644.

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The paper presents a classification of 51 solvents based on clustering in three-dimensional space formed by the empirical scale of PAC, PBC, and PPC parameters designed for interpretation of solvent effect on a model with cross-terms. For the classification used are the clustering methods of the nearest neighbour, of the furthest neighbour, of average bond, and the centroid method. As a result, the solvents have been divided into 8 classes denoted as: I - nonpolar-inert solvents (aliphatic hydrocarbons), IIp - nonpolar-polarizable (aromatic hydrocarbons, tetrachloromethane, carbon disulphide),
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Suljkanović, Mersiha, Jasmin Suljagić, Edita Bjelić, Ante Prkić, and Perica Bošković. "Chemical Characterization of Terpene-Based Hydrophobic Eutectic Solvents and Their Application for Pb(II) Complexation during Solvent Extraction Procedure." Molecules 29, no. 9 (2024): 2122. http://dx.doi.org/10.3390/molecules29092122.

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Solvents prepared from natural terpenes (menthol and thymol), as H-bond acceptors, and a series of organic acids (chain lengths of 8, 10, and 14 C atoms), as H-bond donors, were characterized and tested as reaction media for liquid–liquid extraction purposes. Due to their high hydrophobicity, they seem to be promising alternatives to conventional (nonpolar and toxic) solvents, since they possess relatively less toxic, less volatile, and consequently, more environmentally friendly characteristics. Assuming that the equilibrium is established between solvent and analyte during a ligandless proce
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Subandrate, Subandrate, Sadakata Sinulingga, Annes Claudia Adma та ін. "Effect of solvent polarity on secondary metabolite content and α-glucosidase enzyme IC50 of Dendrophthoe pentandra (L). Miq leaves extract". JURNAL ILMU KEFARMASIAN INDONESIA 22, № 1 (2024): 1. http://dx.doi.org/10.35814/jifi.v22i1.1363.

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Cherry mistletoe (Dendrophthoe pentandra (L). Miq) have an inhibitory effect on the α-glucosidase enzyme, but research related to solvent optimization to find active compound is unclear. Secondary metabolites that can be identified depend on the level of solvent polarity. This study aims to determine the effect of solvent polarity on the secondary metabolite content and the α-glucosidase enzyme by using the polar and nonpolar fractions of the ethyl acetate extract of cherry mistletoe leaves. Cherry mistletoe leaves were extracted using ethyl acetate and were followed by a liquid-liquid fractio
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Al Mohaimeed, Rawabi M., Anees A. Ansari, and Abdullah Aldwayyan. "The Role of Solvent Environment on the Optical Behavior of Chemically Synthesized Silicon Nanoparticles." Journal of Spectroscopy 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/6870645.

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Silicon nanoparticles (Si-NPs) were prepared by solution-based chemical etching method. Optical characteristics of the as-prepared Si-NPs were investigated in different polar and nonpolar organic solvents. The emission and absorption properties of Si-NPs were tuned by altering the environment (solvents). The variation in absorption coefficient was observed because of the solvent interaction nature of Si-NPs. Si-NPs in polar aprotic and nonpolar solvents manifested good luminescence under UV excitation. PL intensities were observed to be depending on etched cross-section area on wafer surface.
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Ghosh, Rajib, Amitabha Nandi, and Dipak K. Palit. "Solvent sensitive intramolecular charge transfer dynamics in the excited states of 4-N,N-dimethylamino-4′-nitrobiphenyl." Physical Chemistry Chemical Physics 18, no. 11 (2016): 7661–71. http://dx.doi.org/10.1039/c5cp07778h.

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Solvent sensitive excited state dynamics of DNBP is explored. In polar solvents, the ultrafast barrierless TICT process is the major relaxation pathway, whereas, in nonpolar solvents the excited state undergoes the PICT process, followed by efficient intersystem crossing to the triplet state.
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Werst, D. W. "Solvent effects in nonpolar solvents: Radical anion reactions." Chemical Physics Letters 202, no. 1-2 (1993): 101–7. http://dx.doi.org/10.1016/0009-2614(93)85357-t.

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Wu, Xiaoli, Xulin Cui, Qi Wang, et al. "Manipulating the cross-layer channels in g-C3N4 nanosheet membranes for enhanced molecular transport." Journal of Materials Chemistry A 9, no. 7 (2021): 4193–202. http://dx.doi.org/10.1039/d0ta10236a.

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Cross-layer channels display ‘gate effect’ to govern molecular selectivity for lamellar membranes. Membranes with hydrophilic/hydrophobic heterostructured channels acquire elevated polar solvent permeance and polar/nonpolar solvents selectivity.
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Chhayarani, Jana, De Parameswar, and Ray P. "Effect of solvents on regioselectivity of anisole nitration." Journal of Indian Chemical Society Vol. 91, Jul 2014 (2014): 1373–77. https://doi.org/10.5281/zenodo.5726618.

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Department of Chemical Engineering, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India E-mail : chhaya_samanta@rediffmail.com, parameswar_de@rediffmail.com, praycuce@rediffmail.com <em>Fax </em>: 91-33-23519755 <em>Manuscript received online 25 October 2013, accepted 13 February 2014</em> Nitration of anisole dissolved in different solvents with 70% (w/v) nitric acid was studied. Solvents were observed to strongly influence positional selectivity and rate of nitration. The <em>ortho/para</em> ratio remained virtually constant (~1.2) in nonpolar solvents, but vari
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Dissertations / Theses on the topic "Nonpolar solvents"

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Smith, Gregory N. "Charging colloids in nonpolar solvents." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.683919.

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Stabilizing charged species in nonpolar solvents is difficult due to their low relative permittivity (Er); therefore, surfactants that form inverse micelles are often used as charge control additives (CCAs). In this Thesis, the structural and electrokinetic properties of surfactants and surfactant-charged colloids in nonpolar solvents were studied. The aggregation of surfactants was studied using high-resolution small-angle neutron scattering (SANS) measurements. Critical micelle concentrations (CMCs) for inverse micelle formation were measured for an anionic and a nonionic surfactant, and the
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Ghosh, Nilanjan. "Structural and associational aspects of some dielectropolar liquid molecules in non polar solvents from relaxation phenomena." Thesis, University of North Bengal, 2002. http://hdl.handle.net/123456789/670.

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Lin, Tina. "Dynamics of Charged Colloids in Nonpolar Solvents." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11005.

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Charging is typically not expected in nonpolar environments due to a high electrostatic barrier to charge dissociation. Nevertheless, charge effects are observed in such environments upon the addition of surfactants, which aggregate to form charge-stabilizing reverse micelles. Surfactants facilitate the charging and electrostatic stabilization of particles dispersed in nonpolar solvents. Suspensions of charged particles in nonpolar solvents are found in a variety of applications, such as electrophoretic displays, in which charged pigment particles are arranged with an external electric field t
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Mutihac, Radu-Christian. "Influence of polar solvents upon the complex formation between crown ethers and cations in nonpolar medium." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985279761.

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Karmakar, Achintya. "Dispersion and absorption phenomena of dipolar liquid in nonpolar solvent." Thesis, University of North Bengal, 2007. http://hdl.handle.net/123456789/662.

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Cox, Kerry James. "The distribution of conformers in some ortho and meta-substituted benzaldehydes in polar and nonpolar solvents." 1990. http://hdl.handle.net/1993/17023.

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Mutihac, Radu-Christian [Verfasser]. "Influence of polar solvents upon the complex formation between crown ethers and cations in nonpolar medium / presented by Radu-Christian Mutihac." 2007. http://d-nb.info/985279761/34.

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Book chapters on the topic "Nonpolar solvents"

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Gooch, Jan W. "Nonpolar Solvents." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7962.

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Maitra, Amarnath. "Amphiphilicity of Aerosol OT in Nonpolar Solvents." In Surfactants in Solution. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7981-6_3.

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Bodycomb, J., and M. Hara. "Scattering Studies of Ionomer Aggregates in Nonpolar Solvents." In Macromolecular Complexes in Chemistry and Biology. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78469-9_20.

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Zhou, Xiaobing, Sanlin Hu, Nick E. Shephard, and Dongchan Ahn. "Diffusion-Controlled Titanate-Catalyzed Condensation of Alkoxysilanes in Nonpolar Solvents." In ACS Symposium Series. American Chemical Society, 2003. http://dx.doi.org/10.1021/bk-2003-0838.ch031.

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Paul, Jared, Phillip Page, Philip Sauers, et al. "Transition-Metal-Substituted Heteropoly Anions in Nonpolar Solvents — Structures and Interaction with Carbon Dioxide." In Nanostructure Science and Technology. Springer US, 2002. http://dx.doi.org/10.1007/0-306-47933-8_17.

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Jerome, R., G. Broze, and Ph Teyssie. "Association of the Ion Pair End-Groups of Halato Telechelic Polymers in Nonpolar Solvents." In Microdomains in Polymer Solutions. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2123-1_14.

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Kang, Tai Jong, Jongwan Yu, and M. Berg. "Solvent Dynamics by Transient Holeburning: Nonpolar Versus Polar Solutes." In Springer Series in Chemical Physics. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84269-6_125.

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Bagchi, Biman, and Ranjit Biswas. "Polar and Nonpolar Solvation Dynamics, Ion Diffusion, and Vibrational Relaxation: Role of Biphasic Solvent Response in Chemical Dynamics." In Advances in Chemical Physics. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470141687.ch4.

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Durrington, P. N. "Lipid and lipoprotein disorders." In Oxford Textbook of Medicine. Oxford University Press, 2010. http://dx.doi.org/10.1093/med/9780199204854.003.1206_update_002.

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Lipids are a heterogeneous group of substances that are distinguished by their low solubility in water and their high solubility in nonpolar (organic) solvents. They are essential as energy stores and respiratory substrates, as structural components of cells, as vitamins, as hormones, for the protection of internal organs, for heat conservation, for digestion, and for lactation....
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Bhar, Ria. "BASIC EXTRACTION AND FRACTIONATION PROCEDURES FOR EXPERIMENTAL PURPOSES OF MEDICINAL PLANTS." In Futuristic Trends in Biotechnology Volume 3 Book 14. Iterative International Publisher, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bbbt14p1ch6.

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The initial and most critical stage in achieving high-quality research outcomes is the preparation of medicinal plants for experimentation. Before conducting the intended biological tests, it is essential to extract and assess the quality and quantity of bioactive components. This study's primary objective was to assess the various techniques employed in our routine research for the production and screening of medicinal plants. While extracts, bioactive fractions, or compounds from medicinal plants find various applications, the methodologies used to obtain them are often similar, regardless o
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Conference papers on the topic "Nonpolar solvents"

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Pötzsch, Sina, Margit Weltschev, and Ralph Bäßler. "Compatibility of Polymers Exposed to Heating Oil Blends with 10 % and 20 % Biodiesel (FAME)." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16222.

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Abstract Biodiesel (FAME) from rapeseed is an environmentally friendly alternative to common fossil fuels. It is also suitable to serve as blending component to fuels like heating oil. If the fuel composition is changed, materials compatibility must be guaranteed. Adding polar biodiesel to nonpolar heating oil, changes the blend’s solvency and might cause swelling, extraction and solvation of polymers. The objective of this research was to investigate the compatibility of polymeric materials, which are commonly used for components in middle distillate facilities, along with blends of heating o
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Park, N. S., and D. H. Waldeck. "Evidence for Multidimensional Stilbene Isomerization." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.mc5.

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Different functional groups and their positions in the phenyl ring of stilbene and different solvents cause differences in the dipole moment, mass, volume and the surrounding environment of the solute during isomerization. These different properties of solute and solvent effect the isomerization rate in two ways, one is through the internal activation barrier and the other is the friction experienced by the solute while undergoing isomerization. Because the transition state has significant charge transfer character the dielectric coupling of the reaction coordinate with the solvent can modify
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Yu, Jongwan, John T. Fourkas, and Mark Berg. "Transient Hole Burning Studies of Electronic State Solvation: Phonon and Structural Contributions." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.thc17.

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Previously we showed that at room temperature the solvation of the nonpolar solute dimethyl-s-tetrazine (DMST) is subpicosecond, even in a variety of viscous solvents expected to show slow relaxation times.1 Measurements of solvation of DMST in glycerol have been extended from room temperature down to the low temperature glass. The solvation is shown to decompose into two major components: one describable in terms of phonon-modulated interactions, and one connected to the structural relaxation of the solvent.
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Kang, Tai Jong, Jongwan Yu, and Mark Berg. "Solvent Dynamics by Transient Holeburning: Nonpolar vs Polar Solutes." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.pdp1.

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Shank and coworkers have used ultrafast techniques to extend holeburning to the liquid phase, where they have observed the effects of rapid intramolecular relaxation [1]. Recently, there have been predictions that holeburning can also be used to study intermolecular interactions of solvents with the solute electronic states [2-4]. We present the first transient holeburning results attributable to intermolecular interactions. They show that large non-polar interactions can develop much more rapidly than the well-studied dipolar solvation interactions.
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Ishibashi, F., J. Kumasaka, T. Esaki, and Y. Sugai. "Experimental Study on the Use of Nanoparticles to Improve the Efficiency of CO2 Geological Storage." In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23962-ea.

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Abstract Supercritical CO2 injected into the aquifer in CCS may migrate upward in the aquifer because its density is lower than the density of formation water. As a result, CO2 cannot be stored widely throughout the aquifer, which may reduce CO2 storage efficiency. The objective of this study is to increase the apparent density of supercritical CO2 by dispersing nanoparticles in itself and to improve CO2 storage efficiency by injecting CO2 widely in the aquifers. The n-hexane, which has a similar solubility parameter to supercritical CO2, was used as an alternative solvent to supercritical CO2
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Haley, L. V., T. L. Collier, T. A. Mattioli, D. L. Thibodeau, and J. A. Koningstein. "Interferences in the Raman excitation profile for the intensity of normal modes of aggregated chlorophyll a." In International Laser Science Conference. Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.thg2.

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If dry chlorophyll a is dissolved in dry nonpolar solvents, aggregation takes place and the degree of aggregation depends on the con centration of this large molecule. The pulsed laser-induced Raman spectrum of such solutions contains contributions from many species, including scattering from excited states in case the laser wavelength is in resonance with the Soret band. At resonance, the Raman intensities experience changes but the presence of close-lying short-lived excited states causes sharp interferences. They occur over a range of 50 cm-1 in the Soret band having a width of ~500 cm-1. S
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Mialocq, J. C., P. Hébert, G. Baldacchino, and T. Gustavsson. "Relaxation dynamics of a polar solvent cage around a nonpolar electronically excited solvent probe. A subpicosecond laser study." In Ultrafast reaction dynamics and solvent effects. AIP, 1994. http://dx.doi.org/10.1063/1.45390.

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Marković, Svetlana, and Jelena Tošović. "CHLOROGENIC ACID – APPLICATION OF CONTEMPORARY DENSITY FUNCTIONALS TO A SINGLE MOLECULE." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac,, 2021. http://dx.doi.org/10.46793/iccbi21.081m.

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Although chlorogenic acid (5-O-caffeoylquinic acid, 5CQA) is a dietary phenol known for its pharmacological and nutritional properties, its structural features and mechanisms of oxidative action have not been completely elucidated. Clarification of the 5CQA structure was conducted by comparing the experimental and simulated IR, Raman, 1H-NMR, 13C-NMR, and UV spectra. For this purpose, a comprehensive conformational analysis of 5CQA was performed to reveal its most stable conformations in the gas-state and solution. Excellent agreement between all experimental and simulated spectra indicates co
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King, J. C., M. C. Asplund, and C. B. Harris. "Vibrational Relaxation of a Charged Species in Nonpolar Solvent." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.pd.9.

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We have performed the first study of the vibrational relaxation of an ionic species, I2−, in a nonpolar solvent, CCl4. To determine the interaction of the charge with the solvent, results will be compared to a similar, but non-ionic species, I2, in the same solvent.
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Fourkas, John T., Andrea Benigno, Jangseok Ma, David Vanden Bout, and Mark Berg. "Mechanical relaxation and solvation dynamics in nonpolar solutions." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.me.3.

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We have used transient hole burning measurements to make the first measurements of solvation dynamics in a completely nonpolar system: dimethyl-s-tetrazine (DMST) in n-butylbenzene.1,2 A new model for solvation based on the mechanical response of a viscoelastic solvent explains the main experimental features and predicts new features on the femtosecond timescale. Although the mechanical solvation mechanism is most prominent in nonpolar systems, it should play a role in all solvation3,4 and electronic dephasing5–8 processes.
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Reports on the topic "Nonpolar solvents"

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Lehotay, Steven J., and Aviv Amirav. Fast, practical, and effective approach for the analysis of hazardous chemicals in the food supply. United States Department of Agriculture, 2007. http://dx.doi.org/10.32747/2007.7695587.bard.

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Background to the topic: For food safety and security reasons, hundreds of pesticides, veterinary drugs, and environmental pollutants should be monitored in the food supply, but current methods are too time-consuming, laborious, and expensive. As a result, only a tiny fraction of the food is tested for a limited number of contaminants. Original proposal objectives: Our main original goal was to develop fast, practical, and effective new approaches for the analysis of hazardous chemicals in the food supply. We proposed to extend the QuEChERS approach to more pesticides, veterinary drugs and pol
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