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Статті в журналах з теми "Selective dispersion"

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Автор: Grafiati

Опубліковано: 6 вересня 2023

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1

Niu, Fu Sheng, Chen Miao, and Jin Xia Zhang. "Selective Flocculation of Fine Grain Oolitic Hematite Behavior Research." Applied Mechanics and Materials 303-306 (February 2013): 2537–40. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2537.

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Анотація:

The fine oolitic hematite ore (<20µm) is easily covered by the ore slime, therefore, it is processed very difficultly with traditional crafts, for example, gravity treatment, magnetic separation, and flotation. The tiny iron ore is unable to recycle effectively, bring about a large of useful minerals running off. It is indicated that the selective flocculation is effective separation craft in many research works. The good dispersion of fine particles is the selective flocculation essential condition, the excessive dispersion will destroy the selective flocculation, at the same time it can be influenced by the water quality, pH, the mixing time, the shear rate and the dispersing agent dosage. In this paper, to oolitic hematite ore, the chemistry dispersion research is conducted to provide the foundation for further selective flocculation separation.

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2

Niu, Fu Sheng, Shu Xian Liu, Jin Xia Zhang, and Yi Miao Nie. "Study on Dispersion Behaviors of Oolitic Hematite Ultrafine Particles in Water." Advanced Materials Research 383-390 (November 2011): 3169–73. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3169.

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Анотація:

The fine oolitic hematite ore (＜20μm) is easily covered by the ore slime, therefore, it is processed very difficultly with traditional crafts, for example, gravity treatment, magnetic separation, and flotation. The tiny iron ore is unable to recycle effectively, bring about a large of useful minerals running off. It is indicated that the selective flocculation is effective separation craft in many research works. The good dispersion of fine particles is the selective flocculation essential condition, the excessive dispersion will destroy the selective flocculation, at the same time it can be influenced by the water quality, pH, the mixing time, the shear rate and the dispersing agent use level. In this article, to oolitic hematite ore, the chemistry dispersion research is conducted to provide the foundation for further selective flocculation separation.

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3

Li, Feng Jiu. "Study on Dispersion Character of Fine Oolitic Hematite Ore Particle." Applied Mechanics and Materials 50-51 (February 2011): 924–28. http://dx.doi.org/10.4028/www.scientific.net/amm.50-51.924.

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Анотація:

The fine oolitic hematite ore (＜20μm) is easily covered by the ore slime, therefore, it is processed very difficultly with traditional crafts, for example, gravity treatment, magnetic separation, and flotation. The tiny iron ore is unable to recycle effectively, bring about a large of useful minerals running off. It is indicated that the selective flocculation is effective separation craft in many research works. The good dispersion of fine particles is the selective flocculation essential condition, the excessive dispersion will destroy the selective flocculation, at the same time it can be influenced by the water quality, pH, the mixing time, the shear rate and the dispersing agent use level. In this article, to oolitic hematite ore, the chemistry dispersion research is conducted to provide the foundation for further selective flocculation separation.

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4

Rommel, E., та R. Kimmich. "T1ρ, dispersion imaging and volume-selective Tlρ dispersion weighted NMR spectroscopy". Magnetic Resonance in Medicine 12, № 3 (грудень 1989): 390–99. http://dx.doi.org/10.1002/mrm.1910120312.

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5

Park, Minsuk, Seongjoo Hwang, and Sang-Yong Ju. "The Effects of Lengths of Flavin Surfactant N-10-Alkyl Side Chains on Promoting Dispersion of a High-Purity and Diameter-Selective Single-Walled Nanotube." Nanomaterials 12, no. 19 (September 27, 2022): 3380. http://dx.doi.org/10.3390/nano12193380.

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Flavin with defined helical self-assembly helps to understand chemical designs for obtaining high-purity semiconducting (s)-single-walled carbon nanotubes (SWNT) in a diameter (dt)-selective manner for high-end applications. In this study, flavins containing 8, 12, 16, and 20 n-alkyl chains were synthesized, and their single/tandem effects on dt-selective s-SWNT dispersibility were investigated at isomolarity. Flavins with n-dodecyl and longer chain lengths (FC12, FC16, and FC20) act as good surfactants for stable SWNT dispersions whereas n-octyl flavin (FC8) exhibits poor dispersibility owing to the lack of SWNT buoyancy. When used with small-dt SWNT, FC8 displays chirality-selective SWNT dispersion. This behavior, along with various flavin helical motifs, prompts the development of criteria for ‘side chain length (lS)’ required for stable and dt-selective SWNT dispersion, which also explains lS-dependent dt-enrichment behavior. Moreover, SWNT dispersions with flavins with dodecyl and longer lS exhibit increased metallic (m)-SWNT, background absorption-contributing carbonaceous impurities (CIs) and preferential selectivity of s-SWNT with slightly larger dt. The increased CIs that affect the SWNT quantum yield were attributed to a solubility parameter. Furthermore, the effects of flavin lS, sonication bath temperature, centrifugal speed, and surfactant concentration on SWNT purity and s-/m-SWNT ratio were investigated. A tandem FC8/FC12 provides fine-tuning of dt-selective SWNT dispersion, wherein the FC8 ratio governs the tendency towards smaller dt. Kinetic and thermodynamic assemblies of tandem flavins result in different sorting behaviors in which wide dt-tunability was demonstrated using kinetic assembly. This study highlights the importance of appropriate side chain length and other extrinsic parameters to obtain dt-selective or high-purity s-SWNT.

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6

Dohnalová, Z., L. Svoboda, and P. Sulcová. "Characterization of kaolin dispersion using acoustic and electroacoustic spectroscopy." Journal of Mining and Metallurgy, Section B: Metallurgy 44, no. 1 (2008): 63–72. http://dx.doi.org/10.2298/jmmb0801063d.

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The objective of this work is the investigation of the kaolin dispersion by the ultrasonic techniques. In contact with aqueous solution clay minerals show cation - exchange properties and certain degree of dissolution or rather selective leaching of components. The work is divided into two main parts - determination of zeta potential and particle size distribution. The first part is focused on measuring of zeta potential. Effects of concentration of solid, different kind of electrolytes (0.01 M KCl, 0.01 M MgCl2 and 0.01 M CaCl2), pH and temperature of the dispersions are investigated. The isoelectric points (IEP) of kaolin suspension are about pH 4-5. Electrolytes containing monovalent cations such as K+ become zeta potential more negative compared to the values obtained with water. Such behavior is explained by the exchange of K+ ions with H+ ions in the system. When the electrolyte is formed by divalent cations such as Mg2+ or Ca2+, the values of zeta potential become less negative than zeta potential of kaolin in water. The second part is focused on the determination of particle size distribution with respect to dispersing conditions, such as the optimal dispersing agent (Na2SiO3, (NaPO3)6, Na4P2O7 or Busperse), time and power of ultrasonication and also the tracking of dispersion stability that is expressed by the measuring of particle size distribution during certain time period.

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7

Roelens, M. A. F., S. Frisken, J. A. Bolger, D. Abakoumov, G. Baxter, S. Poole, and B. J. Eggleton. "Dispersion Trimming in a Reconfigurable Wavelength Selective Switch." Journal of Lightwave Technology 26, no. 1 (January 2008): 73–78. http://dx.doi.org/10.1109/jlt.2007.912148.

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8

Tasis, Dimitrios, Konstantinos Papagelis, Dionysios Douroumis, James R. Smith, Nikolaos Bouropoulos, and Dimitrios G. Fatouros. "Diameter-Selective Solubilization of Carbon Nanotubes by Lipid Micelles." Journal of Nanoscience and Nanotechnology 8, no. 1 (January 1, 2008): 420–23. http://dx.doi.org/10.1166/jnn.2008.104.

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The one-step dispersion of HiPco single-walled carbon nanotubes in aqueous media with the use of a synthetic lyso-phosphatidylcholine was studied. Solubilization occurs through wrapping of lipid molecules around the circumference of the tubes, yielding lipid monolayers on the graphitic sidewalls as evidenced by atomic force microscopy imaging and dynamic light scattering measurements. Raman spectroscopy showed that the dispersion and centrifugation process leads to an effective enrichment of the stable aqueous suspension in carbon nanostructures with smaller diameters.

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9

FURUBAYASHI, Michitaka, Hanako ITOH, and Yuji SHIRAISHI. "Study of Ammonia Dispersion on Selective Non-Catalytic Reduction." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 79, no. 801 (2013): 777–80. http://dx.doi.org/10.1299/kikaib.79.777.

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10

Park, Sang Eon, Ho Seong Lee, Taeg Yong Kwon, and Hyuck Cho. "Dispersion-like signals in velocity-selective saturated-absorption spectroscopy." Optics Communications 192, no. 1-2 (May 2001): 49–55. http://dx.doi.org/10.1016/s0030-4018(01)01155-5.

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11

Hunt, Ryan M., Kevin J. Kramer, and Bassem El-Dasher. "Selective laser sintering of MA956 oxide dispersion strengthened steel." Journal of Nuclear Materials 464 (September 2015): 80–85. http://dx.doi.org/10.1016/j.jnucmat.2015.04.011.

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12

Roudas, I., G. A. Piech, M. Mlejnek, Y. Mauro, D. Q. Chowdhury, and M. Vasilyev. "Coherent Frequency-Selective Polarimeter for Polarization-Mode Dispersion Monitoring." Journal of Lightwave Technology 22, no. 4 (April 2004): 953–67. http://dx.doi.org/10.1109/jlt.2004.825234.

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13

Akoulchin, Alexander, Mandip Singh, Andrei Sidorov, and Peter Hannaford. "Steep atomic dispersion induced by velocity-selective optical pumping." Optics Express 16, no. 20 (September 16, 2008): 15463. http://dx.doi.org/10.1364/oe.16.015463.

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14

Pobel, Christoph R., Matthias A. Lodes, and Carolin Körner. "Selective Electron Beam Melting of Oxide Dispersion Strengthened Copper." Advanced Engineering Materials 20, no. 8 (April 26, 2018): 1800068. http://dx.doi.org/10.1002/adem.201800068.

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15

Castillo-Tapia, Pilar, Kwinten Van Gassen, Qiao Chen, Francisco Mesa, Zvonimir Sipus, and Oscar Quevedo-Teruel. "Dispersion Analysis of Twist-Symmetric Dielectric Waveguides." Photonics 8, no. 6 (June 8, 2021): 206. http://dx.doi.org/10.3390/photonics8060206.

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We propose a circular twist-symmetric dielectric waveguide that is polarization-selective. In the practical implementation of optical fibers, a selective circular polarization is more convenient than its linearly polarized counterpart where previous knowledge of the emitted polarization from the transmitter is unknown. The analysis of the waveguide was conducted with three methods: an eigenmode approach, simulation of a truncated structure, and the so-called multimodal transfer-matrix method (MMTMM). The presented simulations demonstrate that the operational band can be manipulated by tuning the parameters of the structure. Furthermore, the MMTMM allows for a direct and accurate calculation of the attenuation constant of the rejected circular polarization.

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16

Kumar, Inder, Sandeep Verma, and Amit Chaudhary. "Formulation of Ramipril Tablets Containing Solid Dispersion Employing Selective Polymers to Enhance Dissolution Rate." Journal of Drug Delivery and Therapeutics 10, no. 3-s (June 15, 2020): 142–49. http://dx.doi.org/10.22270/jddt.v10i3-s.4109.

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Objective: The present work based on formulation of Ramipril tablets containing solid dispersion employing selective polymers. The objective of the preparation is to prepare the solid dispersion of the Ramipril, which has more responsive value in terms of the dissolution rate. Method: Solid dispersion complex was prepared with two different carriers PEG 6000 and PVP K30. Nine formulations were developed and each formulation were subjected to pre compression and post compression parameters. Result and Discussion: Pre-compression and post compression parameters were studied which had shown good flow property and compiled the standard data. In-vitro dissolution studies shows more than 90 % drug release in phosphate buffer pH 6.8 in 30 min. Out of all formulation F4 showed 92.55±0.67 % drug release with in 30min which was the best result rest of the formulation. Conclusion: Ramipril tablets were successfully prepared and evaluated. F4 formulation shows the greater dissolution rate in phosphate buffer pH 6.8 as compared to other formulations. When compared with marketed formulation it also shows better results. Therefore, Ramipril solid dispersion tablets enhanced the dissolution rate and can be more efficacious for improving oral bioavailability of Ramipril. Keywords: Solid dispersion, Ramipril, Solvent Evaporation Technique.

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17

Raum, Heiner N., Julia Schörghuber, Matthias Dreydoppel, Roman J. Lichtenecker, and Ulrich Weininger. "Site-selective 1H/2H labeling enables artifact-free 1H CPMG relaxation dispersion experiments in aromatic side chains." Journal of Biomolecular NMR 73, no. 10-11 (September 10, 2019): 633–39. http://dx.doi.org/10.1007/s10858-019-00275-z.

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Abstract Aromatic side chains are often key residues in enzyme active sites and protein binding sites, making them attractive probes of protein dynamics on the millisecond timescale. Such dynamic processes can be studied by aromatic 13C or 1H CPMG relaxation dispersion experiments. Aromatic 1H CPMG relaxation dispersion experiments in phenylalanine, tyrosine and the six-ring moiety of tryptophan, however, are affected by 3J 1H–1H couplings which are causing anomalous relaxation dispersion profiles. Here we show that this problem can be addressed by site-selective 1H/2H labeling of the aromatic side chains and that artifact-free relaxation dispersion profiles can be acquired. The method has been further validated by measuring folding–unfolding kinetics of the small protein GB1. The determined rate constants and populations agree well with previous results from 13C CPMG relaxation dispersion experiments. Furthermore, the CPMG-derived chemical shift differences between the folded and unfolded states are in excellent agreement with those obtained directly from the spectra. In summary, site-selective 1H/2H labeling enables artifact-free aromatic 1H CPMG relaxation dispersion experiments in phenylalanine and the six-ring moiety of tryptophan, thereby extending the available methods for studying millisecond dynamics in aromatic protein side chains.

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18

Shi, Rui, Chuan Guo Ma, and Ming Liu. "Selective Distribution of Carbon Black in Epoxy Resin/Thermoplastic Multiphase Composites." Advanced Materials Research 652-654 (January 2013): 73–76. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.73.

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Selective dispersion of carbon black (CB) in three kinds of epoxy resin (EP)/ thermoplastic multiphase conductive polymer composites were investigated. The thermoplastics involved polystyrene (PS), polyethersulfone (PES) and polyetherimide (PEI). The results showed that the selective location of CB particles are mainly controlled by thermodynamics as indicated by consistency of wetting coefficient prediction and real microstructure. For CB/EP/PS, with co-continuous phase structure, CB particles are not selectively located in one polymer but located in both EP-rich phase and PS-rich phase. For CB/EP/PES, with not perfect inverted phase structure, CB particles are selectively located in PES-rich phase. For CB/EP/PEI, with perfect inverted phase structure, CB particles are selectively located in PEI-rich phase.

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19

Gunde, Marta Klanjšek, Zorica Crnjak Orel, Jasmina Kožar Logar, and Boris Orel. "Flocculation Gradient Technique in Terms of Kubelka—Munk Coefficients: Quantifying Black-Pigmented Dispersions." Applied Spectroscopy 49, no. 12 (December 1995): 1756–61. http://dx.doi.org/10.1366/0003702953965984.

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The diffuse reflectance from a painted layer depends upon the layer thickness. The rate of change of diffuse reflectance when thickness increases is the flocculation gradient, which is valuable information about the degree of pigment dispersion in paint. The simple determination method is called the flocculation gradient technique and is suitable to quantify the pigment dispersions in low-absorptive and high-scattering paints. To make the method useful for black-pigmented paints as well, we modified it by applying the Kubelka–Munk theory. This makes it possible to solve the problem of the very narrow linearity region that appears in the diffuse reflectance vs. thickness curve because of high absorption. The modified method allows one to quantify the degree of dispersion in black thickness-sensitive spectrally selective paints, which are used as absorbers in solar collectors.

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20

Park, C. B. "Imaging Dispersion of MASW Data--Full vs. Selective Offset Scheme." Journal of Environmental & Engineering Geophysics 16, no. 1 (March 1, 2011): 13–23. http://dx.doi.org/10.2113/jeeg16.1.13.

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21

Nie, Haiyu, Haifang Wang, Aoneng Cao, Zujin Shi, Sheng-Tao Yang, Yuan Yuan, and Yuanfang Liu. "Diameter-selective dispersion of double-walled carbon nanotubes by lysozyme." Nanoscale 3, no. 3 (2011): 970. http://dx.doi.org/10.1039/c0nr00831a.

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22

Haselhuhn, H. J., and S. Komar Kawatra. "Effects of Water Chemistry on Hematite Selective Flocculation and Dispersion." Mineral Processing and Extractive Metallurgy Review 36, no. 5 (November 19, 2014): 305–9. http://dx.doi.org/10.1080/08827508.2014.978318.

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23

FURUBAYASHI, Michitaka, Hanako ITOH, and Yuji SHIRAISHI. "206 Study of Ammonia Dispersion on Selective Non-Catalytic Reduction." Proceedings of the Symposium on Environmental Engineering 2012.22 (2012): 139–40. http://dx.doi.org/10.1299/jsmeenv.2012.22.139.

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24

Amari, S., R. Vahldieck, and J. Bornemann. "Using selective asymptotics to accelerate dispersion analysis of microstrip lines." IEEE Transactions on Microwave Theory and Techniques 46, no. 7 (July 1998): 1024–27. http://dx.doi.org/10.1109/22.701464.

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25

Song, Shaoxian, Alejandro Lopez-Valdivieso, Shouci Lu, and Jian Ouyang. "Selective dispersion in a diaspore–rutile suspension by sodium fluorosilicate." Powder Technology 123, no. 2-3 (March 2002): 178–84. http://dx.doi.org/10.1016/s0032-5910(01)00449-1.

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26

Lee, H. S., and M. Y. Yang. "The effect of negative pressure aging on the aggregation of Cu2O nanoparticles and its application to laser induced copper electrode fabrication." Physical Chemistry Chemical Physics 17, no. 6 (2015): 4360–66. http://dx.doi.org/10.1039/c4cp04769a.

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27

Rodríguez Martínez, Olga M., Michelle A. Narváez Ramos, Angeliz A. Soto Acevedo, Carolina C. Colón Colón, Darlene Malavé Ramos, Coral Castro Rivera, and Miguel E. Castro Rosario. "pH-Selective Reactions to Selectively Reduce Cancer Cell Proliferation: Effect of CaS Nanostructures in Human Skin Melanoma and Benign Fibroblasts." BioChem 3, no. 1 (January 18, 2023): 15–30. http://dx.doi.org/10.3390/biochem3010002.

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An acidic extracellular pH value (pHe) is characteristic of many cancers, in contrast to the physiologic pHe found in most benign cells. This difference in pH offers a unique opportunity to design and engineer chemicals that can be employed for pH-selective reactions in the extracellular fluid of cancer cells. The viability of human skin melanoma and corresponding fibroblasts exposed to CaS dispersions is reported. The viability of melanoma cells decreases with CaS dispersion concentration and reaches 57% at 3%, a value easily distinguishable from melanoma control experiments. In contrast, the viability of benign fibroblasts remains nearly constant within experimental error over the range of dispersion concentrations studied. The CaS dispersions facilitate vinculin delocalization in the cytoplasmic fluid, a result consistent with improved focal adhesion kinase (FAK) regulation in melanoma cells. Thermodynamic considerations are consistent with the formation of H2S from CaS in the presence of protons. The thermodynamic prediction is verified in independent experiments with solid CaS and acidic aqueous solutions. The amount of H2S formed decreases with pH. An activation energy for the process of (30 ± 10) kJ/mol in the temperature range of 280 to 330 K is estimated from initial rate measurements as a function of temperature. The total Gibbs energy minimization approach was employed to establish the distribution of sulfides—including H2S in the gas and aqueous phases—from the dissociation of CaS as a function of pH to mimic physiologically relevant pH values. Theoretical calculations suggest that partially protonated CaS in solution can be stable until the sulfur atom bonds to two hydrogen atoms, resulting in the formation of Ca2+ and H2S, which can be solvated and/or released to the gas phase. Our results are consistent with a model in which CaS is dissociated in the extracellular fluid of melanoma cells selectively. The results are discussed in the context of the potential biomedical applications of CaS dispersions in cancer therapies.

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28

Zaitsev, Anton D., Petr S. Demchenko, Natallya S. Kablukova, Anna V. Vozianova, and Mikhail K. Khodzitsky. "Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium." Photonics 10, no. 5 (April 26, 2023): 501. http://dx.doi.org/10.3390/photonics10050501.

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Negative group delay may be observed in dispersive media with anomalous dispersion in a certain frequency range. The fact that an outgoing wave packet precedes an incoming one does not violate the causality principle but is only a consequence of a waveform reshaping. This effect is observed in media such as photonic crystals, hyperbolic and epsilon-near-zero metamaterials, undersized waveguides, subwavelength apertures, side-by-side prisms, and resonant circuits at various frequencies. The current work is devoted to the design of a simple negative-group-delay medium with tunable properties in the THz frequency range. This medium consists of a bismuth-based frequency-selective surface on a dielectric substrate and may be tuned both statically and dynamically. While a geometry variation defines a main form of an effective permittivity dispersion and group delay/group velocity spectra, an external voltage allows one to adjust them with high precision. For the configuration proposed in this work, all frequency regions with noticeable change in group delay/group velocity lie within atmospheric transparency windows, which are to be used in 6G communications. This medium may be applied to THz photonics for a tunable phase-shift compensation, dispersion management in systems of THz signal modulation, and for encoding in next-generation wireless communication systems.

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29

Lin, Rijia, Lei Ge, Hui Diao, Victor Rudolph, and Zhonghua Zhu. "Propylene/propane selective mixed matrix membranes with grape-branched MOF/CNT filler." Journal of Materials Chemistry A 4, no. 16 (2016): 6084–90. http://dx.doi.org/10.1039/c5ta10553f.

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30

Yadav, Nisha Kumari, Tripti Shukla, Neeraj Upmanyu, Sharad Prakash Pandey, and Mohammad Azaz Khan. "NOVEL APPLICATION OF MIXED HYDROTROPIC SOLUBILIZATION TECHNIQUE IN THE FORMULATION AND EVALUATION OF SOLID DISPERSION OF FLUPIRTINE MALEATE." Journal of Drug Delivery and Therapeutics 8, no. 5 (September 14, 2018): 481–88. http://dx.doi.org/10.22270/jddt.v8i5.1911.

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Flupirtine is an amino pyridine derivative that functions as a centrally acting non-opioid, non-steroidal analgesic. It is a selective neuronal potassium channel opener that also has NMDA receptor antagonist properties. Its muscle relaxant properties make it popular for back pain and other orthopedics uses. In the present investigation, recently developed mixed hydrotropic solid dispersion technology precludes the use of organic solvent and also decreases the individual concentration of hydrotropic agents, simultaneously decreasing their toxic potential. Mixed-hydrotropic solubilisation technique is the experience to increase the solubility of poorly water soluble drugs in the aqueous solution containing blends of hydrotropic agents, which may give synergistic enhancement effect on solubility of poorly water-soluble drugs and to reduce concentrations of each individual hydrotropic agent to minimize their toxic effects due to high concentration of hydrotropic agents. The Flupirtine loaded solid dispersion was prepared by a solvent evaporation technique using sodium benzoate and a niacinamide hydrotropic mixture. The prepared solid dispersions were valuated regarding their solubility, mean particle size, in-vitro drug release. The prepared solid dispersions were found very stable (chemically). The superior dissolution rate due to its reduced particle size may have contributed to the increased oral bioavailability. This study demonstrated that mixed-solvency may be an alternative approach for poorly soluble drugs to improve their solubility and oral bioavailability. Keywords: Flupirtine, Solid dispersion, Mixed-hydrotropic solubilisation, Solvent evaporation technique, Sodium benzoate, Niacinamide

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31

Atneriya, Umesh K., Dharmendra Solanki, Komal Tikariya, and Arpit Gawshinde. "Development of fast release tablet of talinolol using fourth generation carrier of solid dispersion technique." Journal of Pharmaceutical and Biological Sciences 11, no. 1 (July 15, 2023): 35–42. http://dx.doi.org/10.18231/j.jpbs.2023.007.

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Talinolol is a beta1-selective adreno receptor antagonist well known for its Cardio protective and antihypertensive activity. Talinolol is a beta blocker. In biopharmaceutical classification system the drugs which come under class II are characterized by more membrane permeability, less dissolution rate. Talinolol is a poor aqueous solubility drug leads to poor bioavailability. So, the aimed of this study was to develop immediate release tablet of talinolol by solid dispersions technique using poloxamer 407 as a carrier. Poloxamer 407 is a hydrophilic synthetic block copolymer widely used as a solubility enhancer. Basically there are three methods used for solid dispersion. Melting or fusion method solvent evaporation method. Melting solvent method. Solvent Evaporation Method In this method a suitable solvent is selected which can capable of solubilizing both drug and hydrophilic carrier. The solvent evaporation technique is one of the most commonly used methods to prepare polymeric nanoparticles, more specifically drug-loaded polymeric systems, for pharmaceutical formulations. The prepared solid dispersions were evaluated for production yield percent, drug content, solubility, FTIR, and DSC study analysis. The prepared formulation of Talinolol with P407 in the ratio of 1:5 gave highest dissolution rate of 75.28% at 30min.So it can be concluded that the combination of solid dispersion technology as well as using superdisintergrants an encouraging and effective technique to prepare efficient fast dissolving tablets of Talinolol.The outcome of this investigation presents poloxamer 407 solid dispersion mediated fast dissolving tablets successfully resolve problem of slow rate of dissolution of talinolol.

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32

Tiwari, Santosh Kr, Kartikey Verma, Pupulata Saren, Ramesh Oraon, Amrita De Adhikari, Ganesh Chandran Nayak, and Vijay Kumar. "Manipulating selective dispersion of reduced graphene oxide in polycarbonate/nylon 66 based blend nanocomposites for improved thermo-mechanical properties." RSC Advances 7, no. 36 (2017): 22145–55. http://dx.doi.org/10.1039/c7ra02044a.

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33

Fong, Darryl, and Alex Adronov. "Recent developments in the selective dispersion of single-walled carbon nanotubes using conjugated polymers." Chem. Sci. 8, no. 11 (2017): 7292–305. http://dx.doi.org/10.1039/c7sc02942j.

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34

Zhao, Heng, Lihua Guo та Yongfu Lian. "Dispersion of arc-discharged single-walled carbon nanotubes using the natural α-amino acid derivative N-dodecanoyl leucinate". RSC Advances 10, № 36 (2020): 21643–49. http://dx.doi.org/10.1039/d0ra02862b.

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35

Nish, Adrian, Jeong-Yuan Hwang, James Doig, and Robin J. Nicholas. "Highly selective dispersion of single-walled carbon nanotubes using aromatic polymers." Nature Nanotechnology 2, no. 10 (September 16, 2007): 640–46. http://dx.doi.org/10.1038/nnano.2007.290.

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36

Chen, Yusheng, Rosi N. Gunasinghe, Xiao-Qian Wang, and Yi Pang. "Selective dispersion of single-walled carbon nanotubes by a cationic surfactant." RSC Advances 3, no. 47 (2013): 25097. http://dx.doi.org/10.1039/c3ra43654c.

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37

Di Muccio, Alfonso, Patrizia Pelosi, Ivano Camoni, Danilo Attard Barbini, Roberto Dommarco, Tiziana Generali, and Antonella Ausili. "Selective, solid-matrix dispersion extraction of organophosphate pesticide residues from milk." Journal of Chromatography A 754, no. 1-2 (November 1996): 497–506. http://dx.doi.org/10.1016/s0021-9673(96)00535-3.

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38

Berton, Nicolas, Fabien Lemasson, Jana Tittmann, Ninette Stürzl, Frank Hennrich, Manfred M. Kappes, and Marcel Mayor. "Copolymer-Controlled Diameter-Selective Dispersion of Semiconducting Single-Walled Carbon Nanotubes." Chemistry of Materials 23, no. 8 (April 26, 2011): 2237–49. http://dx.doi.org/10.1021/cm200275v.

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39

Sakai, Toshio, Hisao Kawaura та Riso Kato. "Secondary Emission in NaNO2under Selective Excitation: Dispersion and Relaxation of ν00Exciton". Journal of the Physical Society of Japan 56, № 6 (15 червня 1987): 1943–46. http://dx.doi.org/10.1143/jpsj.56.1943.

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40

Karchemsky, Faina, Eyal Drug, Efrat Mashiach-Farkash, Ludmila Fadeev, Haim J. Wolfson, Michael Gozin та Oren Regev. "Diameter-selective dispersion of carbon nanotubes by β-lactoglobulin whey protein". Colloids and Surfaces B: Biointerfaces 112 (грудень 2013): 16–22. http://dx.doi.org/10.1016/j.colsurfb.2013.07.018.

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41

Abdullahi, Wasiu, Martin Crossman, and Peter Charles Griffiths. "Probing Selective Adsorption in Cationic-Polymer Induced Aggregation of Binary Anionic Particulate Dispersions Using Solvent Relaxation NMR." Polymers 14, no. 9 (May 4, 2022): 1875. http://dx.doi.org/10.3390/polym14091875.

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Анотація:

NMR solvent relaxation has been used to characterize the surfaces present in binary anionic particle dispersions, before and after exposure to a cationic polymer. In the polymer-free case, it is shown that the measured specific relaxation rate of the solvent is a population-weighted average of all surfaces present, enabling preferential adsorption to be explored. The addition of the oppositely charged polymer led to phase separation, which was accelerated by gentle centrifugation. The measured relaxation rates and the equilibrium particle concentrations indicate that the cationic hydroxyethylcellulose polymer (HEC LR) exhibited no significant preference for either latex or laponite in binary blends with silica, but a strong preference for TiO2. This study illustrates the versatility of solvent relaxation to probe surface area, surface type and dispersion composition in complex formulations.

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42

Shi, Haiting, Lili Du, Wenjuan Xiong, Mingjie Dai, Wai Kin Chan, and David Lee Phillips. "Study of electronic interactions and photo-induced electron transfer dynamics in a metalloconjugated polymer–single-walled carbon nanotube hybrid by ultrafast transient absorption spectroscopy." Journal of Materials Chemistry A 5, no. 35 (2017): 18527–34. http://dx.doi.org/10.1039/c7ta02753b.

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43

Liang, Shuai, Ayyagari V. Subrahmanyam, Mohammadreza Khadem, Yuming Zhao, and Alex Adronov. "Selective dispersion of single-walled carbon nanotubes with electron-rich fluorene-based copolymers." RSC Advances 6, no. 31 (2016): 25733–40. http://dx.doi.org/10.1039/c6ra02524b.

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We report novel π-conjugated copolymers containing electron-donating dithiafulvene (DTF) and π-extended tetrathiafulvalene (exTTF) repeat units for selective dispersion of single-walled carbon nanotubes.

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44

Ma, Chuan Guo, and Ming Liu. "Carbon Black Selective Dispersion and Electrical Properties of Epoxy Resin/Polystyrene/Carbon Black Ternary Composites." Advanced Materials Research 548 (July 2012): 94–98. http://dx.doi.org/10.4028/www.scientific.net/amr.548.94.

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Carbon black (CB) selective dispersion and conductive properties of immiscible thermoplastic/thermosetting polymer blends consisting of polystyrene (PS) and epoxy resin (EP) were investigated in this paper. The results showed that CB particles are preferentially localized in EP phase in PS/EP blends. The blend with 10 pbw (parts by weight) PS presented an EP continuous phase structure, and both blends with 20 pbw and 30 pbw developed into a bi-continuous phase structure. The selective dispersion of CB particles was explained by thermodynamic parameters. The phase structures of blends have important influences on both conductive and dielectric properties. The blends with 10 pbw PS has a very low percolation threshold nearly 0.25wt%.

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45

Chen, Xi Rong, Zao Ming Chen, and Wei Ming Lin. "Effect of La Addition on Ru/Al₂O₃ Catalyst for Selective CO Oxidation." Advanced Materials Research 347-353 (October 2011): 3616–20. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3616.

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Ru/Al2O3 catalysts with various La2O3 contents were synthesized by impregnation method. The catalysts were tested for selective CO oxidation and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy with energy-dispersive spectroscopy, and H2 temperature-programmed reduction. The effects of La addition into Ru/Al2O3 catalysts on structure and performance were investigated. Results show that higher CO conversions (>99%) and CO2 selectivity are obtained at 110–170 °C on RuLa/Al2O3. La doping promotes the dispersion of Ru species, thereby enhancing catalytic activity. The analysis reveals that the modification of La2O3 is favorable for the formation of active Ru species with good dispersion and enhanced selective CO oxidation.

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46

Cheng, Xiaoxiao, Tengfei Miao, Haotian Ma, Lu Yin, Wei Zhang, Zhengbiao Zhang, and Xiulin Zhu. "The construction of photoresponsive polymer particles with supramolecular helicity from achiral monomers by helix-sense-selective polymerization." Polymer Chemistry 11, no. 12 (2020): 2089–97. http://dx.doi.org/10.1039/c9py01868a.

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Optically active azobenzene-containing polymer particles successfully prepared from achiral monomers for the first time by helix-sense-selective dispersion polymerization, also known as asymmetric helix-chirogenic polymerization.

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47

Gonçalves, Liliana P. L., David B. Christensen, Maria Meledina, Laura M. Salonen, Dmitri Y. Petrovykh, Enrique Carbó-Argibay, Juliana P. S. Sousa, et al. "Selective formic acid dehydrogenation at low temperature over a RuO2/COF pre-catalyst synthesized on the gram scale." Catalysis Science & Technology 10, no. 7 (2020): 1991–95. http://dx.doi.org/10.1039/d0cy00145g.

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48

Rodríguez, Marcela C., María D. Rubianes, and Gustavo A. Rivas. "Highly Selective Determination of Dopamine in the Presence of Ascorbic Acid and Serotonin at Glassy Carbon Electrodes Modified with Carbon Nanotubes Dispersed in Polyethylenimine." Journal of Nanoscience and Nanotechnology 8, no. 11 (November 1, 2008): 6003–9. http://dx.doi.org/10.1166/jnn.2008.466.

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We report the highly selective and sensitive voltammetric dopamine quantification in the presence of ascorbic acid and serotonin by using glassy carbon electrodes modified with a dispersion of multi-wall carbon nanotubes (MWCNT) in polyethylenimine, PEI (GCE/MWCNT-PEI). The electrocatalytic activity of the MWCNT deposited on the glassy carbon electrode has allowed an important decrease in the overvoltages for the oxidation of ascorbic acid and dopamine, making possible a clear definition of dopamine, serotonin and ascorbic acid oxidation processes. The sensitivities for dopamine in the presence and absence of 1.0 mM ascorbic acid and serotonin were (2.18±0.03 × 105 μAM−1 (r = 0.9998); and (2.10±0.07 × 105 μAM−1 (r = 0.9985), respectively, demonstrating the excellent performance of the GCE/MWCNT-PEI. The detection limit for dopamine in the mixture was 9.2 × 10−7 M. The R. S. D. for the determination of 50 μM dopamine using four different electrodes was 3.9% when modified with the same MWCNT/PEI dispersion, and 4.6% when using four different dispersions. The modified electrode has been successfully applied for recovery assays of dopamine in human blood serum. Therefore, the new sensor represents an interesting and promising alternative for the electrochemical quantification of neurotransmitters and other analytes of clinical interest.

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49

He, Man-Jie, Wen-Xia Xiao, Hui Xie, Cheng-Jie Fan, Lan Du, Xiao-Ying Deng, Ke-Ke Yang, and Yu-Zhong Wang. "Facile fabrication of ternary nanocomposites with selective dispersion of multi-walled carbon nanotubes to access multi-stimuli-responsive shape-memory effects." Materials Chemistry Frontiers 1, no. 2 (2017): 343–53. http://dx.doi.org/10.1039/c6qm00047a.

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Анотація:

A multi-stimuli-responsive shape-memory ternary nanocomposites with selective dispersion of MWCNTs was developed by introducing MWCNTs into a PBS-PCL multiblock copolymer matrix (PBSPCL) by a facile approach.

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50

Yang, Fan, Minjian Wang, Wei Liu, Bin Yang, Ying Wang, Jun Luo, Yushu Tang, et al. "Atomically dispersed Ni as the active site towards selective hydrogenation of nitroarenes." Green Chemistry 21, no. 3 (2019): 704–11. http://dx.doi.org/10.1039/c8gc03664k.

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Noble-metal-free catalytic hydrogenation of nitroarenes is achieved through the rational design of atomically dispersed Ni sites on N-doped porous carbon. The outstanding activity of the catalyst originates from the atomic dispersion of Ni active sites with a high Ni–N₃ content.

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