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Artigos de revistas sobre o tema "Colloids"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Natarajan, N., and G. Suresh Kumar. "Numerical modelling of colloidal transport in fractured porous media with double layered fracture-skin." Journal of Geo-Engineering Sciences 1, no. 2 (2014): 83–94. http://dx.doi.org/10.3233/jgs-130016.

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A numerical model is developed for studying the transport of colloids in a coupled fracture-matrix system with double layer fracture-skin. The governing equations describing colloid transport along the fracture and diffusion into fracture-skin layers as well as rock-matrix, normal to the fracture axis are coupled with each other. The coupled non linear equations are solved numerically with fully implicit finite difference method. Sensitivity analysis is performed to investigate the effect of various colloid properties on the colloid concentration in the multiple porosity fractured system. Coll

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Bagalkot, Nikhil, and G. Kumar. "Colloid Transport in a Single Fracture–Matrix System: Gravity Effects, Influence of Colloid Size and Density." Water 10, no. 11 (2018): 1531. http://dx.doi.org/10.3390/w10111531.

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A numerical model was developed to investigate the influence of gravitational force on the transport of colloids in a single horizontal fracture–matrix system. Along with major transport phenomena, prominence was given to study the mass flux at the fracture–matrix interface, and colloid penetration within the rock matrix. Results suggest that the gravitational force significantly alters and controls the velocity of colloids in the fracture. Further, it was shown that the colloid density and size play a vital part in determining the extent that gravity may influence the transport of colloids in

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Klitzke, Sondra, Friederike Lang, Jason Kirby, Enzo Lombi, and Rebecca Hamon. "Lead, antimony and arsenic in dissolved and colloidal fractions from an amended shooting-range soil as characterised by multi-stage tangential ultrafiltration and centrifugation." Environmental Chemistry 9, no. 5 (2012): 462. http://dx.doi.org/10.1071/en12010.

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Environmental context The size of soil colloids is – among other characteristics – crucial for the mobility of associated contaminants. We analysed the effect of liming on the size of colloids mobilised from strongly contaminated shooting-range soils using multi-stage tangential ultrafiltration (MTUF) for the size fractionation of dispersed soil colloids. Our results indicate the high analytical potential of MTUF and show that liming induces the aggregation of colloids, thereby decreasing the mobilisation of colloid-bound Sb and As, but increasing colloidal Pb. Abstract The size and compositio

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4

Ibrahim, Yahaya, and Saratu Abddulfatah. "PAIR INTERACTION OF ACTIVE COLLOIDS IN AN EXTERNAL CHEMICAL GRADIENT." FUDMA JOURNAL OF SCIENCES 6, no. 3 (2022): 271–77. http://dx.doi.org/10.33003/fjs-2022-0603-999.

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We study the pair interaction of chemically isotropic active colloidal particles in an externally imposed chemical gradient. Colloid particles migrate in response to a gradient of chemical solutes (i.e., via the diffusiophoresis mechanism). The particles motion induces fluid flow and distort locally the background chemical concentration field. Using the methods of images, we calculate the phoretic inter-particle interaction between two symmetric active colloids in the presence of an externally applied gradient. We highlight an interesting colloidal dipole that would arise from tuning the surfa

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5

Schmid, Günter, Andreas Lehnert, Ulrich Kreibig, Zbignew Adamczyk, and Peter Belouschek. "Synthese und elektronenmikroskopische Untersuchung kontrolliert gewachsener, ligandstabilisierter Goldkolloide sowie theoretische Überlegungen zur Oberflächenbelegung durch Kolloide / Synthesis and Electron Microscopic Investigation of Controlled Grown, Ligand Stabilized Gold Colloids and Theoretical Considerations on the Covering of Surfaces by Colloids." Zeitschrift für Naturforschung B 45, no. 7 (1990): 989–94. http://dx.doi.org/10.1515/znb-1990-0713.

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18 nm Gold colloids are used as seeds for a controlled growth of 36 nm colloids which are then stabilized by P(m-C6H4SO3Na)3. These colloids can be isolated as golden leaflets and are readily soluble in water in virtually any concentration. Electron microscopic investigations prove a very small particle size distribution. X-ray powder diffraction and molecular weight determinations support the results of the electron microscopic investigations. The distance between the colloidal particles in two-dimensional layers corresponds to double-layers of phosphane ligands around each colloid, twice 1.2

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6

Niu, Lihua, Rui Chen, Yi Li, et al. "Colloidal Filterable Bacteria Enhance Ammonia Nitrogen Enrichment in River Colloids under Different Turbidity Conditions: Bacterial Diversity, Assembly Mechanism, and Nitrogen Transformation." Water 16, no. 7 (2024): 1024. http://dx.doi.org/10.3390/w16071024.

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Turbidity has been one of the most typical problems in urban rivers, accompanied by eutrophication. Though the colloid is a nonnegligible factor associated with turbidity and nutrient enrichment in urban rivers, the characteristics of nitrogen enrichment and bacterial communities of colloids under different turbidity conditions of urban rivers have not been well understood. In this study, colloids of low and high molecular weights (LMW, 30 kDa–0.2 μm, and HMW, 0.2–1 μm) were separately collected from the bulk water (<1 μm) of several typical urban rivers in China. Since the colloidal concen

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7

Nikishina, Maria B., Evgenia V. Ivanova, Yury M. Atroschenko, et al. "Biological activity of colloidal solutions of silver, obtained by means of sálix cáprea extract." Butlerov Communications 60, no. 10 (2019): 54–59. http://dx.doi.org/10.37952/roi-jbc-01/19-60-10-54.

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The presented publication is devoted to the study of the biological activity of silver colloids synthesized based on extracts obtained from various parts of the goat willow plant (Sálix cáprea). The ability of colloidal silver solutions of various concentrations to stimulate growth processes in wheat seeds at the germination stage is analyzed. The effect of colloidal solutions on the catalytic effect of amylase was studied. The fungicidal activity of synthesized silver particles was studied. For the study, colloidal silver particles were obtained by the "green synthesis" method. Extracts of go

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8

Joshi, Darshana, Dylan Bargteil, Alessio Caciagli, et al. "Kinetic control of the coverage of oil droplets by DNA-functionalized colloids." Science Advances 2, no. 8 (2016): e1600881. http://dx.doi.org/10.1126/sciadv.1600881.

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We report a study of reversible adsorption of DNA-coated colloids on complementary functionalized oil droplets. We show that it is possible to control the surface coverage of oil droplets using colloidal particles by exploiting the fact that, during slow adsorption, compositional arrest takes place well before structural arrest occurs. As a consequence, we can prepare colloid-coated oil droplets with a “frozen” degree of loading but with fully ergodic colloidal dynamics on the droplets. We illustrate the equilibrium nature of the adsorbed colloidal phase by exploring the quasi–two-dimensional

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9

Laabs, C., G. Amy, and M. Jekel. "Organic colloids and their influence on low-pressure membrane filtration." Water Science and Technology 50, no. 12 (2004): 311–16. http://dx.doi.org/10.2166/wst.2004.0728.

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Wastewater treatment by low-pressure membrane filtration (MF and UF) is affected to a large extent by macromolecules and colloids. In order to investigate the influence of organic colloids on the membrane filtration process, colloids were isolated from a wastewater treatment plant effluent using a rotaryevaporation pre-concentration step followed by dialysis. Stirred cell tests were carried out using redissolved colloids, with and without additional glass fiber filtration. After constant pressure membrane filtration of 190 L/m2, the initial flux had declined by 50% for colloids &gt; 6-8 kD

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10

Priyadarshini, N., M. Sampath, Shekhar Kumar, U. Kamachi Mudali, and R. Natarajan. "Probing Uranium(IV) Hydrolyzed Colloids and Polymers by Light Scattering." Journal of Nuclear Chemistry 2014 (March 26, 2014): 1–10. http://dx.doi.org/10.1155/2014/232967.

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Tetravalent uranium readily undergoes hydrolysis even in highly acidic aqueous solutions. In the present work, solutions ranging from 0.4 to 19 mM (total U) concentration (1<pH<4) are carefully investigated by light scattering technique with special emphasis on polymerization leading to colloid formation. The results clearly indicate that the concentration has significant effect on particle size as well as stability of colloids. With increasing concentration the size of colloids formed is smaller due to more crystalline nature of the colloids. Stability of colloids formed at lower concen

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11

Lattuada, Marco, and Kata Dorbic. "Polymer Colloids: Moving beyond Spherical Particles." CHIMIA 76, no. 10 (2022): 841. http://dx.doi.org/10.2533/chimia.2022.841.

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When thinking about colloidal particles, the fist image that comes into mind is that of tiny little polystyrene spheres with a narrow size distribution. While spherical polymer colloids are one of the workhorses of colloid science, scientists have been working on the development of progressively advanced strategies to move beyond particles with spherical shapes, and prepared polymer colloids with more complex morphologies. This short review aims at providing a summary of these developments, focusing primarily on methods applicable to submicron particles, with an eye towards their applications

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12

Kunberger, T., and M. A. Gabr. "Laboratory testing and microanalysis of colloidal mobilization from a glacial till." Canadian Geotechnical Journal 48, no. 7 (2011): 1116–24. http://dx.doi.org/10.1139/t11-030.

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The effect of the dispersion and piping of clay fines — colloid mobilization — as a means of remediating subsurface contamination was investigated. Prior colloid mobility research has focused on mitigating colloidal movement to reduce contaminant transport or monitoring colloids to determine the extent of mobility and contamination transport. To date, limited work has been performed to evaluate remediation efficiency associated with the removal of clay-sized (colloidal) particles and related sorbed contamination. Laboratory flow-through tests were performed on a glacial till from a radioactive

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13

Wang, Yongsheng, Haiyan Huo, Xueren Qian, and Jing Shen. "Colloids, nanostructures, and supramolecular assemblies for papermaking." BioResources 15, no. 3 (2020): 4646–49. http://dx.doi.org/10.15376/biores.15.3.4646-4649.

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The dominating role of colloid science in papermaking processes, as exemplified by wet-end chemistry, is now well known. The concept of colloids dates back to about 160 years ago. In certain cases, however, the term “colloids” can have an overlapping meaning with the modern terms “nanomaterials” and “supramolecular assemblies”. The latter terms, and the scientists who have gravitated to those terms, have enriched colloid science, providing new insights into colloidal systems. It is proposed here that reconsidering papermaking in light of these multi-disciplinary sciences has potential to facil

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14

Liao, Yu Bo, Zhao Sheng Lai, Yao Yong Meng, and Ping Li Zhang. "Surface-Enhanced Raman Spectroscopic Study of Calf Thymus DNA on Two Different Silver Colloids." Advanced Materials Research 781-784 (September 2013): 1072–75. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.1072.

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Two different silver colloids were produced by the reduction of AgNO3using sodium citrate (SCAg colloid) or hydroxylamine hydrochloride (HHAg colloid) as reductant. A comparative study was made on SERS spectra (λexc=514.5 nm) of the calf thymus DNA on the two silver colloids in solution of 0.06mol/L NaCl, pH7.0. With the SCAg colloid, the bands at 732, 915, 1340, and 1448 cm-1for adenine, and 800, 1180, 1590, 1625 and 1651 cm-1for thymidine are dramatically enhanced. It shows that the DNA molecules can be oriented relatively perpendicularly to the SCAg colloidal surface via the N6H2, N7 of ade

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15

Amézaga González, María Fernanda, Jazzely Acosta Bezada, Víctor Gómez Flores, et al. "Effect of Physiological Fluid on the Photothermal Properties of Gold Nanostructured." International Journal of Molecular Sciences 24, no. 9 (2023): 8339. http://dx.doi.org/10.3390/ijms24098339.

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Colloidal gold particles have been extensively studied for their potential in hyperthermia treatment due to their ability to become excited in the presence of an external laser. However, their light-to-heat efficiency is affected by the physiologic environment. In this study, we aimed to evaluate the ability of gold sphere, rod, and star-shaped colloids to elevate the temperature of blood plasma and breast cancer-simulated fluid under laser stimulation. Additionally, the dependence of optical properties and colloid stability of gold nanostructures with physiological medium, particle shape, and

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16

Sasamoto, Hiroshi, and Shingo Onda. "Preliminary results for natural groundwater colloids in sedimentary rocks of the Horonobe Underground Research Laboratory, Hokkaido, Japan." Geological Society, London, Special Publications 482, no. 1 (2018): 191–203. http://dx.doi.org/10.1144/sp482.1.

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AbstractColloid concentration is an important parameter in models of colloid-facilitated transport. The purpose of the present study is to characterize colloid concentrations and colloid stability in natural groundwater from the Horonobe Underground Research Laboratory (URL) in Hokkaido, Japan. The particle sizes of colloids in groundwaters from the Horonobe URL range from several nanometres to c. 500 nm, with a mode particle size of c. 120 nm. Evaluation of colloid stability by DLVO theory suggests that larger colloids (i.e. >100 nm in diameter) would be more stable than smaller colloids i

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RAGALLER, MAXIMILIAN J. R., HERMANN THEILEN, and THEA KOCH. "Volume Replacement in Critically Ill Patients with Acute Renal Failure." Journal of the American Society of Nephrology 12, suppl 1 (2001): S33—S39. http://dx.doi.org/10.1681/asn.v12suppl_1s33.

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Abstract. Maintenance and restoration of intravascular volume are essential tasks of critical care management to achieve sufficient organ function and to avoid multiple organ failure in critically ill patients. Inadequate intravascular volume followed by impaired renal perfusion is the predominate cause of acute renal failure. Crystalloid solutions are the first choice to correct fluid and electrolyte deficits in these patients. However, in case of major hypovolemia, particularly in situations of increased capillary permeability, colloid solutions are indicated to achieve sufficient tissue per

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18

Kashyap, Swarnima, Shashank Mishra, and Shantanu K. Behera. "Aqueous Colloidal Stability of Graphene Oxide and Chemically Converted Graphene." Journal of Nanoparticles 2014 (November 13, 2014): 1–6. http://dx.doi.org/10.1155/2014/640281.

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Graphene oxide (GO) was prepared by modified Hummer’s method, and chemically converted graphene (CCG) was prepared by further reduction of the aqueous GO colloid. The effect of pH on particle size, particle charge, and light absorption of the aqueous colloids of GO and CCG was studied with titration against HCl or NaOH, to find the ideal characteristics for a stable dispersion. The GO colloid was stable in the pH range of 4–11, whereas the CCG colloid gained stability at a relatively narrower pH range of 7–10. Poor stability of the colloids was observed for both GO and CCG colloids at both ext

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19

Chang, Chaur-Yang, Kuo-Hsiung Tseng, Jui-Tsun Chang, Meng-Yun Chung, and Zih-Yuan Lin. "A Study of Nano-Tungsten Colloid Preparing by the Electrical Spark Discharge Method." Micromachines 13, no. 11 (2022): 2009. http://dx.doi.org/10.3390/mi13112009.

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This study developed an energy-enhanced (ee)-micro-electric discharge machining (EDM) system for preparing nano-tungsten (nano-W) colloids. This system enables spark discharge using tungsten wires immersed in deionized water, to produce nano-W colloids. Compared with the chemical preparation method, the processing environment for preparing colloids in this study prevented nanoparticle escape. Among the nano-W colloids prepared using the ee-micro-EDM system and an industrial EDM system, the colloid prepared by the ee-micro-EDM system exhibited a more favorable absorbance, suspensibility, and pa

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20

Valverde-Alva, Miguel A., Jhenry F. Agreda-Delgado, Juan A. Vega-González, et al. "Effect of the magnetic field on the synthesis of colloidal silver and gold nanoparticles by laser ablation in bidestilated water." MOMENTO, no. 63 (July 9, 2021): 1–11. http://dx.doi.org/10.15446/mo.n63.91515.

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The effect of magnetic field of 0.3 T on the concentration, distribution of sizes in suspension and zeta potential of colloidal gold and colloidal silver nanoparticles, obtained by considering the pulsed laser ablation in double distilled water was studied. The magnetic field was transverse to the direction of incidence of the laser radiation and parallel to the surface of a submerged target. An Nd: YAG laser was used (1064 nm in wavelength, 10 ns in duration, repetition rate of 10 Hz and 37 mJ of energy) to ablate targets. The colloids were characterized by inductively coupled plasma optical

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21

Chikina, Yu, and V. Shikin. "Multicharged Colloids at the Metal/Electrolyte Interface." Электрохимия 59, no. 1 (2023): 56–60. http://dx.doi.org/10.31857/s0424857023010218.

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The electrostatic properties of multicharged colloids (the so-called DLVO complexes) at the interface of two media with different permittivities are discussed. It is shown that being quasi-neutral in the electrolyte volume, the DLVO colloids turn out to be partly charged near the z = 0 boundary that separates these media. The problem of the interaction of an individual colloid, which has a solid inoculating core R0≫a0, (a0 is the interatomic distance) and the charge Q=Ze≫e (e is elementary charge), with the metal/electrolyte interface is considered in detail. The problem has various applicatio

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22

Tan, Yan Peng, Xiao Wen Zhang, Jun Wen Lv, Dong Shan Tang, and Qin Su. "Transformation Behaviors of U(VI) on Irons Hydroxide Colloids." Advanced Materials Research 734-737 (August 2013): 2563–67. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2563.

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The presence of the colloid will affect uranium heap leaching. The objective of this study was the examination of the ability of colloid retardation to uranium by irons hydroxide colloids simulated heap leaching process. Batch studies have been carried by observing the effects of pH, contact time, uranium concentration. Iron hydroxide colloids can exist stably at pH 1.5-3.0. The size of the colloid samples is between 20 nm and 1000 nm. The sorption equilibrium was attained at 24 h. The load uranium capacity on iron hydroxide colloids are between 2.43×10-3 and 3.84×10-3 mmol/mol. The colloid mo

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Nohé, Boris, Tanja Johannes, Jörg Reutershan, et al. "Synthetic Colloids Attenuate Leukocyte-Endothelial Interactions by Inhibition of Integrin Function." Anesthesiology 103, no. 4 (2005): 759–67. http://dx.doi.org/10.1097/00000542-200510000-00014.

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Background It has been suspected that synthetic colloids may interfere with leukocyte adhesion by down-regulation of endothelial cell adhesion molecules. Although inhibition of endothelial inflammation might reduce leukocyte-related tissue injury, the same mechanism may be detrimental for host defense during severe infection. Regarding the widespread use of colloids, the authors performed a laboratory investigation to determine the mechanisms by which synthetic colloids interfere with leukocyte-endothelial interactions. Methods Adhesion molecule expression on native and cytokine-activated endo

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Kalnina, Daina, Kārlis Agris Gross, Artur Medvids, and Pavels Onufrijevs. "Formation of Negatively Charged AgI Colloid Nanoparticles by Condensation." Advanced Materials Research 1117 (July 2015): 159–63. http://dx.doi.org/10.4028/www.scientific.net/amr.1117.159.

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The stability of silver halide colloids is reported to be important for the toxicological outcome. This study shows a well-suited and cheap condensation reaction to obtain negatively charged silver iodide (AgI) nanoparticles without additional stabilization agents. Charged AgI colloids were synthesized from silver nitrate and potassium iodide solutions. An excess of potassium iodide not only imparted a negative charge, but provided a narrow particle size distribution (50 ± 10 nm). The change of optical properties in the colloid was investigated by UV-VIS spectroscopy. A silver iodide exciton a

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Yokoyama, Kazushige, Kieran Brown, Peter Shevlin, et al. "Examination of Adsorption Orientation of Amyloidogenic Peptides Over Nano-Gold Colloidal Particle Surfaces." International Journal of Molecular Sciences 20, no. 21 (2019): 5354. http://dx.doi.org/10.3390/ijms20215354.

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The adsorption of amyloidogenic peptides, amyloid beta 1–40 (Aβ1–40), alpha-synuclein (α-syn), and beta 2 microglobulin (β2m), was attempted over the surface of nano-gold colloidal particles, ranging from d = 10 to 100 nm in diameter (d). The spectroscopic inspection between pH 2 and pH 12 successfully extracted the critical pH point (pHo) at which the color change of the amyloidogenic peptide-coated nano-gold colloids occurred due to aggregation of the nano-gold colloids. The change in surface property caused by the degree of peptide coverage was hypothesized to reflect the ΔpHo, which is the

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Lai, Yeong Lin, Li Wei Chen, and Chih Hung Chen. "Processes of Titanium-Dioxide Colloids for Working Electrodes of Dye-Sensitized Solar Cells." Applied Mechanics and Materials 865 (June 2017): 54–59. http://dx.doi.org/10.4028/www.scientific.net/amm.865.54.

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New titanium-dioxide (TiO2) colloids composed of nano-crystalline TiO2 and polydimethylsiloxane (PDMS) have been developed for use in the working electrodes of dye-sensitized solar cells (DSSCs). The surface morphology and electrical characteristics of the TiO2 colloid electrodes were studied. The analysis of the surface morphology of the TiO2 colloids was conducted by an atomic force microscope (AFM) and a field-emission scanning electron microscope (FE-SEM). The photovoltaic characteristics of the TiO2 colloids with different compositions were investigated. The TiO2 content of the colloids d

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Majumdar, Udayan, Thrisha Alexander, Morris Waskar, and Manoj V. Dagaonkar. "Effect of biofilm on colloid attachment in saturated porous media." Water Science and Technology 70, no. 2 (2014): 241–48. http://dx.doi.org/10.2166/wst.2014.197.

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Biofilm plays an important role in controlling the transport of colloids in a porous media. Biofilms are formed when micro-organisms come in contact with substrates, and are able to attach and grow with availability of nutrients. The microorganisms get embedded in a matrix of the substrate and extracellular polymeric substances which are responsible for the morphology, physico-chemical properties, structure and coherence of the biofilm. In this study, the effect of biofilm and its aging on colloid removal was studied on a glass bead column. Oocysts, polystyrene microspheres and inorganic collo

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Kurosawa, S., and S. Ueta. "Effect of colloids on radionuclide migration for performance assessment of HLW disposal in Japan." Pure and Applied Chemistry 73, no. 12 (2001): 2027–37. http://dx.doi.org/10.1351/pac200173122027.

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Colloidal effect is one of the major factors to enhance the migration of radionuclides in groundwater. The experimental and theoretical studies of colloid mobility and colloid-facilitated radionuclide transport for the performance assessment of high-level radioactive waste (HLW) geological disposal is presented in this paper. The major aims of the study are (1) to study the filtration effect on colloids by the engineered barrier system, (2) to study bentonite colloid generation by erosion of the engineered barrier system, and (3) to calculate radionuclide migration with groundwater colloids th

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Sepehrnia, Nasrollah, Olga Fishkis, Bernd Huwe, and Jörg Bachmann. "Natural colloid mobilization and leaching in wettable and water repellent soil under saturated condition." Journal of Hydrology and Hydromechanics 66, no. 3 (2018): 271–78. http://dx.doi.org/10.1515/johh-2017-0058.

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AbstractThe coupled transport of pollutants that are adsorbed to colloidal particles has always been a major topic for environmental sciences due to many unfavorable effects on soils and groundwater. This laboratory column study was conducted under saturated moisture conditions to compare the hydrophobic character of the suspended and mobilized colloids in the percolates released from a wettable subsoil and a water repellent topsoil. Both soils with different organic matter content were analyzed for wettability changes before and after leaching using sessile drop contact angles as well as wate

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Li, Runwei, Changfu Wei, Hefa Cheng, and Gang Chen. "Adhesion of Colloids and Bacteria to Porous Media: A Critical Review." Reviews of Adhesion and Adhesives 7, no. 4 (2019): 417–60. http://dx.doi.org/10.7569/raa.2019.097314.

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Adhesion of colloids and bacteria to various surfaces is important for a variety of environmental phenomena including microbial biofouling and contamination prevention. Under saturated conditions, both colloids and bacteria have the opportunity to attach to porous medium surfaces. Under water unsaturated conditions or in the presence of the air-water interface, besides the porous medium surfaces, colloids and bacteria can also attach to the air-water interface, including the air-water-solid threephase interface. The magnitudes of adhesion of colloids and bacteria are correlated to the interact

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Roller, Jörg, Aleena Laganapan, Janne-Mieke Meijer, Matthias Fuchs, and Andreas Zumbusch. "Observation of liquid glass in suspensions of ellipsoidal colloids." Proceedings of the National Academy of Sciences 118, no. 3 (2021): e2018072118. http://dx.doi.org/10.1073/pnas.2018072118.

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Despite the omnipresence of colloidal suspensions, little is known about the influence of colloid shape on phase transformations, especially in nonequilibrium. To date, real-space imaging results at high concentrations have been limited to systems composed of spherical colloids. In most natural and technical systems, however, particles are nonspherical, and their structural dynamics are determined by translational and rotational degrees of freedom. Using confocal microscopy of fluorescently labeled core–shell particles, we reveal that suspensions of ellipsoidal colloids form an unexpected stat

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Liu, Iris B., Nima Sharifi-Mood, and Kathleen J. Stebe. "Curvature-driven assembly in soft matter." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2072 (2016): 20150133. http://dx.doi.org/10.1098/rsta.2015.0133.

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Control over the spatial arrangement of colloids in soft matter hosts implies control over a wide variety of properties, ranging from the system’s rheology, optics, and catalytic activity. In directed assembly, colloids are typically manipulated using external fields to form well-defined structures at given locations. We have been developing alternative strategies based on fields that arise when a colloid is placed within soft matter to form an inclusion that generates a potential field. Such potential fields allow particles to interact with each other. If the soft matter host is deformed in s

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Sposito, Garrison. "Surface Reactions in Natural Aqueous Colloidal Systems." CHIMIA 43, no. 6 (1989): 169. https://doi.org/10.2533/chimia.1989.169.

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Natural colloids are mixtures of inorganic and organic polymers resulting from weathering processes. These materials include layer-type aluminosilicates, hydrous oxides, and biodegraded organic matter. Regardless of their molecular structure, these polymeric constituents present reactive functional groups of two principal kinds at the colloid/aqueous solution interface: siloxane ditrigonal cavities and inorganic or organic hydroxy groups. The reactive proportion of each kind of functional group at a colloid surface depends on the extent of chemical weathering and the composition of the materia

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Szakasits, Megan E., Keara T. Saud, Xiaoming Mao, and Michael J. Solomon. "Rheological implications of embedded active matter in colloidal gels." Soft Matter 15, no. 40 (2019): 8012–21. http://dx.doi.org/10.1039/c9sm01496a.

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We examine the effect of embedded active colloids on the linear viscoelastic moduli of colloidal gels. We find that the autonomous, out-of-equilibrium dynamics of active colloids incorporated into the colloidal network decreases gel elasticity.

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Leppard, G. G., M. M. West, D. T. Flannigan, J. Carson, and JNA Lott. "A classification scheme for marine organic colloids in the Adriatic Sea: colloid speciation by transmission electron microscopy." Canadian Journal of Fisheries and Aquatic Sciences 54, no. 10 (1997): 2334–49. http://dx.doi.org/10.1139/f97-140.

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Organic colloids from the Adriatic Sea, covering the full colloid size range, were characterized on a per-colloid basis by transmission electron microscopy applied to ultrathin sections of embedded colloids. To detect, assess, and minimize artifacts, a multimethod correlative approach to analysis was used. A colloid classification scheme was developed from the characterizations, with individual colloid species defined in the broad sense established by environmental analytical aquatic chemists. The basic scheme is related to derivative classification schemes in which abundant colloid species ar

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Kuno, Goshi, and Akikazu Matsumoto. "Easy Cell Detachment and Spheroid Formation of Induced Pluripotent Stem Cells Using Two-Dimensional Colloidal Arrays." Macromol 3, no. 2 (2023): 224–33. http://dx.doi.org/10.3390/macromol3020014.

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Induced pluripotent stem cells (iPSCs) may develop into any form of cell and are being intensively investigated. The influence on iPSCs of nanostructures generated using two-dimensional colloidal arrays was examined in this study. Colloidal arrays were formed using the following procedure. First, core–shell colloids were adsorbed onto a glass substrate using a layer-by-layer method. Second, the colloids were immobilized via thermal fusion. Third, the surface of the colloids was modified by plasma treatment. By adjusting the number density of colloids, cultured iPSCs were easily detached from t

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Xu, Bing, and Ren Guo Song. "Fabrication of Ag Nanoparticles Colloids by Pulsed Laser Ablation in Liquid." Advanced Materials Research 123-125 (August 2010): 675–78. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.675.

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Ag nanoparticles colloids have been fabricated by pulsed laser ablation in various liquids. The particle size, morphology and absorption spectroscopy of the obtained nanoparticles colloids were characterized by ultraviolet to visible (UV-Vis) spectrophotometer and transmission electron microscopy (TEM), the average diameter and its distribution were analyzed by Image-ProPlus software. The results showed that the Ag nanoparticles with best characterization are those produced at the repetition rate of 10Hz and laser fluence of 4.2J/cm2 by ablating for 7.5min in the distilled water, with the leas

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Ding, Xuhan, Guang Xu, Dengfei Wang, Zhenmin Luo, and Tao Wang. "Effect of Synergistic Aging on Bauxite Residue Dust Reduction Performance via the Application of Colloids, an Orthogonal Design-Based Study." Polymers 13, no. 12 (2021): 1986. http://dx.doi.org/10.3390/polym13121986.

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The application of polymer colloids is a promising approach for bauxite residue dust pollution control. However, due to the existence of synergistic aging, the efficiency of colloid dynamic viscosity to predict the dust control performance of bauxite residue is unclear. Previous studies were also rarely performed under synergistic aging conditions. Thus, this paper investigates the relationship between colloids’ viscosity and dust control performance under synergistic aging modes. Results illustrated that the binary colloid achieved better dust control performance than unitary colloid for thei

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Molkova, Elena A., Vladimir I. Pustovoy, Evgenia V. Stepanova, et al. "pH-Dependent HEWL-AuNPs Interactions: Optical Study." Molecules 29, no. 1 (2023): 82. http://dx.doi.org/10.3390/molecules29010082.

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Optical methods (spectroscopy, spectrofluorometry, dynamic light scattering, and refractometry) were used to study the change in the state of hen egg-white lysozyme (HEWL), protein molecules, and gold nanoparticles (AuNPs) in aqueous colloids with changes in pH, and the interaction of protein molecules with nanoparticles was also studied. It was shown that changing pH may be the easiest way to control the protein corona on gold nanoparticles. In a colloid of nanoparticles, both in the presence and absence of protein, aggregation–deaggregation, and in a protein colloid, monomerization–dimerizat

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Shim, Wonmi, Chan Sik Moon, Hyeonjin Kim, et al. "Tailoring the Morphology of Supraparticles by Primary Colloids with Different Shapes, Sizes and Dispersities." Crystals 11, no. 2 (2021): 79. http://dx.doi.org/10.3390/cryst11020079.

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Surface-templated evaporation driven (STED) method is a promising method to fabricate supraparticles with various sizes, porosities, and shapes by drying colloidal dispersion drops on liquid repellent surfaces. Until now, for the method, only spherical shaped colloidal particles have been used as primary colloids. Here, we introduce six different shapes of nano-colloidal dispersions for the STED method: nanocubics, nanoplates, nanosheets, coffin-shaped nanoparticles (NPs), spherical NPs, and aggregates of NPs. It is confirmed that the shape and size of the primary colloids have little effect f

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Liu, Yongliang, Yud-Ren Chen, Xiangwu Nou, and Kuanglin Chao. "Potential of Surface-Enhanced Raman Spectroscopy for the Rapid Identification of Escherichia Coli and Listeria Monocytogenes Cultures on Silver Colloidal Nanoparticles." Applied Spectroscopy 61, no. 8 (2007): 824–31. http://dx.doi.org/10.1366/000370207781540060.

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Surface-enhanced Raman (SERS) spectra of various batches of bacteria adsorbed on silver colloidal nanoparticles were collected to explore the potential of the SERS technique for rapid and routine identification of E. coli and L. monocytogenes cultures. Relative standard deviation (RSD) of SERS spectra from silver colloidal suspensions and ratios of SERS peaks from small molecules (K3PO4) were used to evaluate the reproducibility, stability, and binding effectiveness of citrate-reduced silver colloids over batch and storage processes. The results suggested consistent reproducibility of silver c

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Pan, Hong Cheng, Jiang Tao Liu, Jin Ming Liang, et al. "Preparation of Pt Colloids via a Wet-Chemical Method for Methanol Sensor." Advanced Materials Research 295-297 (July 2011): 527–30. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.527.

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Pt colloids were synthesized by a wet-chemical method. The Pt colloids were modified on the glassy carbon electrode (GCE). The electrochemical behavior and electrocatalyst for methanol of the colloidal Pt-modified electrode in H2SO4medium were investigated. The results show that the as-prepared Pt colloids are good electrocatalysts for methanol oxidation and the oxidation current increases with methanol concentration in the range of 0.002 to 0.5 M. The colloidal Pt-modified electrode is simple, easy-to-use and reusable, showing promising applications in the electrocatalyst and determination of

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Kumar, Manoj, Anupam Singh, Benedetta Del Secco, et al. "Assembling anisotropic colloids using curvature-mediated lipid sorting." Soft Matter 18, no. 9 (2022): 1757–66. http://dx.doi.org/10.1039/d1sm01517f.

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Anisotropic colloidal geometry is used to drive lipid sorting in multi-component membranes along the colloids, which are then exploited to create “shape-anisotropic patchy colloids” for directed self-assembly.

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Zhou, Xiang, Dongbao Yao, Wenqiang Hua, et al. "Programming colloidal bonding using DNA strand-displacement circuitry." Proceedings of the National Academy of Sciences 117, no. 11 (2020): 5617–23. http://dx.doi.org/10.1073/pnas.1917941117.

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As a strategy for regulating entropy, thermal annealing is a commonly adopted approach for controlling dynamic pathways in colloid assembly. By coupling DNA strand-displacement circuits with DNA-functionalized colloid assembly, we developed an enthalpy-mediated strategy for achieving the same goal while working at a constant temperature. Using this tractable approach allows colloidal bonding to be programmed for synchronization with colloid assembly, thereby realizing the optimal programmability of DNA-functionalized colloids. We applied this strategy to conditionally activate colloid assembly

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Zuo, Rui, Kexue Han, Rongtao Shi, et al. "Effect of Colloidal Silicate on the Migration Behaviour of Strontium in Groundwater Environment of Geological Disposal Candidate Site." Journal of Chemistry 2019 (September 23, 2019): 1–11. http://dx.doi.org/10.1155/2019/9606121.

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Various colloids are present in the natural groundwater environment, and colloids act on the processes involved when radionuclides leak from a repository in a high-level waste disposal site. This paper investigates the effect of colloidal silicate in natural groundwater environments on the migration behaviour of Sr(II). Three different experimental cases have been designed: (1) effect in the presence of colloidal silicate, (2) effect in the presence of a porous medium, and (3) effect in the presence of both colloidal silicate and porous medium (referred to as CS, PM, and PC, respectively). Bat

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Choi, Jinseok, Seong-Gyu Park, Yeo-Jin Choi, et al. "Viscosity-Controllable Graphene Oxide Colloids Using Electrophoretically Deposited Graphene Oxide Sheets." Micromachines 13, no. 12 (2022): 2157. http://dx.doi.org/10.3390/mi13122157.

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Graphene oxide (GO) is one of the interesting ink materials owing to its fascinating properties, such as high dissolubility in water and high controllable electric properties. For versatile printing application, the viscosity of GO colloids should be controlled in order to meet the specific process requirements. Here, we report on the relatively rapid fabrication of viscosity-increased GO (VIGO) colloids mixed with electrophoretically deposited GO sheets (EPD-GO). As the GO colloid concentration, applied voltage, and deposition time increase, the viscosity of the GO colloids becomes high. The

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Wang, Xiaolu, Martin In, Christophe Blanc, Paolo Malgaretti, Maurizio Nobili, and Antonio Stocco. "Wetting and orientation of catalytic Janus colloids at the surface of water." Faraday Discussions 191 (2016): 305–24. http://dx.doi.org/10.1039/c6fd00025h.

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Janus colloidal particles show remarkable properties in terms of surface activity, self-assembly and wetting. Moreover they can perform autonomous motion if they can chemically react with the liquid in which they are immersed. In order to understand the self-propelled motion of catalytic Janus colloids at the air–water interface, wetting and the orientation of the catalytic surface are important properties to be investigated. Wetting plays a central role in active motion since it determines the contact between the fuel and the catalytic surface as well as the efficiency of the transduction of

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Mirzaei, Behzad, Hossein Nezamabadi-pour, Amir Raoof, Vahid Nikpeyman, Enno de Vries, and Reza Derakhshani. "A Novel Image Processing Approach for Colloid Detection in Saturated Porous Media." Sensors 24, no. 16 (2024): 5180. http://dx.doi.org/10.3390/s24165180.

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Over recent decades, natural and artificial colloids, as well as nanoparticles, have been increasingly used in various applications. Consequently, with this rising consumption, surface and subsurface environments are more exposed to these particles. The presence of these particles and the colloid-facilitated transport of microorganisms, the interactions between dissolved contaminants and mobile colloids in porous media, and the fate and transport of colloids through groundwater—one of the primary sources of water supply for human societies—have attracted extensive research. This study investig

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Shang, Shu Bo, and Xu Qian Li. "Study on the Co-Migration of Pb with Soil Colloids under Rainfall." Advanced Materials Research 183-185 (January 2011): 437–41. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.437.

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In this experiment, clay loam, fine sandy loam and silty loam collected from the farmland (FL), floodplain (FP) and Loess platform (LP) in Changchun separately were chosen to study the role of rainfall on the migration of heavy metal (Pb)-colloid complexes quantitively through soil column simulation in laboratory. The purpose of this study is to illuminate the tendency for colloid-Pb co-migrating to deep soil and groundwater. The study shows whether how the mechanism between colloid and heavy metal acts, the processes exist in common. First, through some sort of adsorption, heavy metal form co

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Homoky, William B., Tim M. Conway, Seth G. John, et al. "Iron colloids dominate sedimentary supply to the ocean interior." Proceedings of the National Academy of Sciences 118, no. 13 (2021): e2016078118. http://dx.doi.org/10.1073/pnas.2016078118.

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Dissolution of marine sediment is a key source of dissolved iron (Fe) that regulates the ocean carbon cycle. Currently, our prevailing understanding, encapsulated in ocean models, focuses on low-oxygen reductive supply mechanisms and neglects the emerging evidence from iron isotopes in seawater and sediment porewaters for additional nonreductive dissolution processes. Here, we combine measurements of Fe colloids and dissolved δ56Fe in shallow porewaters spanning the full depth of the South Atlantic Ocean to demonstrate that it is lithogenic colloid production that fuels sedimentary iron supply

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