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Articoli di riviste sul tema "Polymer colloids"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 agosto 2024

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1

Lattuada, Marco, and Kata Dorbic. "Polymer Colloids: Moving beyond Spherical Particles." CHIMIA 76, no. 10 (October 26, 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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2

Lee, Kyoungmun, and Siyoung Q. Choi. "Stratification of polymer–colloid mixtures via fast nonequilibrium evaporation." Soft Matter 16, no. 45 (2020): 10326–33. http://dx.doi.org/10.1039/d0sm01504k.

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3

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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4

La Mesa, Camillo. "Hybrid Colloids Made with Polymers." Applied Sciences 14, no. 12 (June 13, 2024): 5135. http://dx.doi.org/10.3390/app14125135.

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Polymers adsorb onto nanoparticles, NPs, by different mechanisms. Thus, they reduce coagulation, avoid undesired phase separation or clustering, and give rise to hybrid colloids. These find uses in many applications. In cases of noncovalent interactions, polymers adsorb onto nanoparticles, which protrude from their surface; the polymer in excess remains in the medium. In covalent mode, conversely, polymers form permanent links with functional groups facing outward from the NPs’ surface. Polymers in contact with the solvent minimize attractive interactions among the NPs. Many contributions stab

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5

Ali, Imran, Sara H. Althakfi, Mohammad Suhail, Marcello Locatelli, Ming-Fa Hsieh, Mosa Alsehli, and Ahmed M. Hameed. "Advances in Polymeric Colloids for Cancer Treatment." Polymers 14, no. 24 (December 13, 2022): 5445. http://dx.doi.org/10.3390/polym14245445.

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Polymer colloids have remarkable features and are gaining importance in many areas of research including medicinal science. Presently, the innovation of cancer drugs is at the top in the world. Polymer colloids have been used as drug delivery and diagnosis agents in cancer treatment. The polymer colloids may be of different types such as micelles, liposomes, emulsions, cationic carriers, and hydrogels. The current article describes the state-of-the-art polymer colloids for the treatment of cancer. The contents of this article are about the role of polymeric nanomaterials with special emphasis

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6

Smith, Gregory N., Matthew J. Derry, James E. Hallett, Joseph R. Lovett, Oleksander O. Mykhaylyk, Thomas J. Neal, Sylvain Prévost, and Steven P. Armes. "Refractive index matched, nearly hard polymer colloids." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2226 (June 2019): 20180763. http://dx.doi.org/10.1098/rspa.2018.0763.

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Refractive index matched particles serve as essential model systems for colloid scientists, providing nearly hard spheres to explore structure and dynamics. The poly(methyl methacrylate) latexes typically used are often refractive index matched by dispersing them in binary solvent mixtures, but this can lead to undesirable changes, such as particle charging or swelling. To avoid these shortcomings, we have synthesized refractive index matched colloids using polymerization-induced self-assembly (PISA) rather than as polymer latexes. The crucial difference is that these diblock copolymer nanopar

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7

Okubo, Masayoshi. "Polymer Colloids." Kobunshi 40, no. 10 (1991): 704–7. http://dx.doi.org/10.1295/kobunshi.40.704.

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8

Huglin, Malcolm B. "Polymer colloids." Polymer 27, no. 4 (April 1986): 635. http://dx.doi.org/10.1016/0032-3861(86)90253-3.

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9

Soetrisno, Diego D., Carina D. V. Martínez Narváez, Mariah J. Gallegos, Vivek Sharma, and Jacinta C. Conrad. "Pinching dynamics and extensional rheology of dense colloidal suspensions with depletion attractions." Journal of Rheology 68, no. 1 (December 29, 2023): 99–112. http://dx.doi.org/10.1122/8.0000717.

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We study the extensional flow properties by characterizing the capillarity-driven pinching dynamics of dense colloidal suspensions at a constant volume fraction ϕ=0.40 with polymer-induced depletion interactions using a dripping-onto-substrate (DoS) protocol. Methacrylate copolymer particles with dimethylacrylamide copolymer brushes are suspended in a refractive-index- and density-matched mixture of 80 (w/w)% glycerol in water with NaCl added to screen the electrostatic repulsions. Depletion attractions between the colloids are introduced by adding polyacrylamide polymers of weight and dispers

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10

Wang, Likun, Zhaoran Chu, Xuanjun Ning, Ziwei Huang, Wenwei Tang, Weizhong Jiang, Jiayi Ye, and Cheng Chen. "Inverse Colloidal Crystal Polymer Coating with Monolayer Ordered Pore Structure." Crystals 12, no. 3 (March 11, 2022): 378. http://dx.doi.org/10.3390/cryst12030378.

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A functional lens coating, based on the structure of inversed colloidal photonic crystals, is proposed. The color-reflecting colloidal crystal was first prepared by self-assembly of nano-colloids and was infiltrated by adhesive polymer solution. As the polymer was crosslinked and the crystal array was removed, a robust mesh-like coating was achieved. Such a functional coating has good transmittance and has a shielding efficiency of ~9% for UV–blue light according to different particle sizes of the nano-colloids, making it an ideal functional material.

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11

Forcada, Jacqueline, and Roque Hidalgo-Alvarez. "Functionalized Polymer Colloids: Synthesis and Colloidal Stability." Current Organic Chemistry 9, no. 11 (July 1, 2005): 1067–84. http://dx.doi.org/10.2174/1385272054368484.

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12

Armes, Steven P. "Conducting polymer colloids." Current Opinion in Colloid & Interface Science 1, no. 2 (April 1996): 214–20. http://dx.doi.org/10.1016/s1359-0294(96)80007-0.

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13

Guzmán, Eduardo, and Armando Maestro. "Soft Colloidal Particles at Fluid Interfaces." Polymers 14, no. 6 (March 11, 2022): 1133. http://dx.doi.org/10.3390/polym14061133.

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The assembly of soft colloidal particles at fluid interfaces is reviewed in the present paper, with emphasis on the particular case of microgels formed by cross-linked polymer networks. The dual polymer/colloid character as well as the stimulus responsiveness of microgel particles pose a challenge in their experimental characterization and theoretical description when adsorbed to fluid interfaces. This has led to a controversial and, in some cases, contradictory picture that cannot be rationalized by considering microgels as simple colloids. Therefore, it is necessary to take into consideratio

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14

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 (June 17, 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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15

DEB, DEBABRATA, DOROTHEA WILMS, ALEXANDER WINKLER, PETER VIRNAU, and KURT BINDER. "METHODS TO COMPUTE PRESSURE AND WALL TENSION IN FLUIDS CONTAINING HARD PARTICLES." International Journal of Modern Physics C 23, no. 08 (August 2012): 1240011. http://dx.doi.org/10.1142/s0129183112400116.

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Colloidal systems are often modeled as fluids of hard particles (possibly with an additional soft attraction, e.g. caused by polymers also contained in the suspension). In simulations of such systems, the virial theorem cannot be straightforwardly applied to obtain the components of the pressure tensor. In systems confined by walls, it is hence also not straightforward to extract the excess energy due to the wall (the “wall tension”) from the pressure tensor anisotropy. A comparative evaluation of several methods to circumvent this problem is presented, using as examples fluids of hard spheres

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16

Wang, Bin, Margot Jacquet, Kunzhou Wang, Kun Xiong, Minhao Yan, Jérémie Courtois, and Guy Royal. "pH-Induced fragmentation of colloids based on responsive self-assembled copper(ii) metallopolymers." New Journal of Chemistry 42, no. 10 (2018): 7823–29. http://dx.doi.org/10.1039/c7nj05100j.

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17

La Mesa, Camillo, and Gianfranco Risuleo. "Polymer Wrapping onto Nanoparticles Induces the Formation of Hybrid Colloids." Coatings 13, no. 5 (April 24, 2023): 823. http://dx.doi.org/10.3390/coatings13050823.

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Polymers stabilize the nanoparticles onto which they wrap, avoiding coagulation and undesired phase separation processes. Wrapping gives rise to hybrid colloids, and is useful in bio-intended applications. In non-covalent interaction modes, polymers physically adsorb onto the nanoparticles’ surface, NPs, and some of their portions protrude outside. Both their non-interacting parts and the free polymers are in contact with the solvent, and/or are dispersed in it. Wrapping/protruding ratios were forecast with a simple statistical thermodynamic model, and the related energy calculated. The wrappi

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18

Cerdà, Joan Josep, Josep Batle, Carles Bona-Casas, Joan Massó, and Tomàs Sintes. "Depletion Interactions at Interfaces Induced by Ferromagnetic Colloidal Polymers." Polymers 16, no. 6 (March 15, 2024): 820. http://dx.doi.org/10.3390/polym16060820.

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The pair-interaction force profiles for two non-magnetic colloids immersed in a suspension of ferromagnetic colloidal polymers are investigated via Langevin simulations. A quasi-two-dimensional approach is taken to study the interface case and a range of colloidal size ratios (non-magnetic:magnetic) from 6:1 up to 20:1 have been considered in this work. Simulations show that when compared with non-magnetic suspensions, the magnetic polymers strongly modify the depletion force profiles leading to strongly oscillatory behavior. Larger polymer densities and size ratios increase the range of the d

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19

Puertas, A. M., and F. J. de las Nieves. "Colloidal Stability of Polymer Colloids with Variable Surface Charge." Journal of Colloid and Interface Science 216, no. 2 (August 1999): 221–29. http://dx.doi.org/10.1006/jcis.1999.6294.

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20

Egorov, Sergei A. "Depletion Interactions between Nanoparticles: The Effect of the Polymeric Depletant Stiffness." Polymers 14, no. 24 (December 9, 2022): 5398. http://dx.doi.org/10.3390/polym14245398.

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A Density Functional Theory is employed to study depletion interactions between nanoparticles mediated by semiflexible polymers. The four key parameters are the chain contour length and the persistence length of the polymeric depletant, its radius of gyration, and the nanoparticle radius. In the Density Functional Theory calculation of the depletion interaction between the nanoparticles mediated by semiflexible polymers, the polymer gyration radius is kept constant by varying the contour length and the persistence length simultaneously. This makes it possible to study the effect of the chain s

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21

Aldana, Maximino, Miguel Fuentes-Cabrera, and Martín Zumaya. "Self-Propulsion Enhances Polymerization." Entropy 22, no. 2 (February 22, 2020): 251. http://dx.doi.org/10.3390/e22020251.

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Self-assembly is a spontaneous process through which macroscopic structures are formed from basic microscopic constituents (e.g., molecules or colloids). By contrast, the formation of large biological molecules inside the cell (such as proteins or nucleic acids) is a process more akin to self-organization than to self-assembly, as it requires a constant supply of external energy. Recent studies have tried to merge self-assembly with self-organization by analyzing the assembly of self-propelled (or active) colloid-like particles whose motion is driven by a permanent source of energy. Here we pr

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22

Velgosova, Oksana, Lívia Mačák, Erika Múdra, Marek Vojtko, and Maksym Lisnichuk. "Preparation, Structure, and Properties of PVA–AgNPs Nanocomposites." Polymers 15, no. 2 (January 10, 2023): 379. http://dx.doi.org/10.3390/polym15020379.

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The aim of the work was to prepare a polymer matrix composite doped by silver nanoparticles and analyze the influence of silver nanoparticles (AgNPs) on polymers’ optical and toxic properties. Two different colloids of AgNPs were prepared by chemical reduction. The first colloid, a blue one, contains stable triangular nanoparticles (the mean size of the nanoparticles was ~75 nm). UV–vis spectrophotometry showed that the second colloid, a yellow colloid, was very unstable. Originally formed spherical particles (~11 nm in diameter) after 25 days changed into a mix of differently shaped nanoparti

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23

Bezrukov, Artem, and Yury Galyametdinov. "Tuning Molecular Orientation Responses of Microfluidic Liquid Crystal Dispersions to Colloid and Polymer Flows." International Journal of Molecular Sciences 24, no. 17 (August 31, 2023): 13555. http://dx.doi.org/10.3390/ijms241713555.

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An important approach to molecular diagnostics is integrating organized substances that provide complex molecular level responses to introduced chemical and biological agents with conditions that optimize and distinguish such responses. In this respect, liquid crystal dispersions are attractive components of molecular diagnostic tools. This paper analyzes a colloid system, containing a nematic liquid crystal as a dispersed phase, and aqueous surfactant and polymer solutions as the continuous phases. We applied a microfluidic approach for tuning orientation of liquid crystal molecules in picoli

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24

Davis, T. P., and J. P. A. Heuts. "25th Australasian Polymer Symposium Special Issue." Australian Journal of Chemistry 55, no. 7 (2002): 359. http://dx.doi.org/10.1071/ch02160.

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In February 2001 the 25th Australasian Polymer Symposium was held at the University of New England in Armidale and was attended by over 200 Australasian and international scientists; about a third of these were registered as students. Preceding the conference, a well-attended joint workshop/summer school with the theme of radical polymerization was convened in association with the Cooperative Research Centre for Polymers (CRC-P) and the ARC Key Centre for Polymer Colloids (KCPC).

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25

Sung, An-Min, and Irja Piirma. "Electrosteric Stabilization of Polymer Colloids." Langmuir 10, no. 5 (May 1994): 1393–98. http://dx.doi.org/10.1021/la00017a014.

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26

KASAI, Kiyoshi. "Preparation of Monodisperse Polymer Colloids." Kobunshi 44, no. 5 (1995): 290–93. http://dx.doi.org/10.1295/kobunshi.44.290.

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27

Wilkinson, Michael C., John Hearn, and Paul A. Steward. "The cleaning of polymer colloids." Advances in Colloid and Interface Science 81, no. 2 (July 1999): 77–165. http://dx.doi.org/10.1016/s0001-8686(98)00084-0.

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28

Dobler, F., T. Pith, M. Lambla, and Y. Holl. "Coalescence mechanisms of polymer colloids." Journal of Colloid and Interface Science 152, no. 1 (August 1992): 1–11. http://dx.doi.org/10.1016/0021-9797(92)90002-4.

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Dobler, F., T. Pith, M. Lambla, and Y. Holl. "Coalescence mechanisms of polymer colloids." Journal of Colloid and Interface Science 152, no. 1 (August 1992): 12–21. http://dx.doi.org/10.1016/0021-9797(92)90003-5.

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30

Texter, John. "Polymer colloids in photonic materials." Comptes Rendus Chimie 6, no. 11-12 (November 2003): 1425–33. http://dx.doi.org/10.1016/j.crci.2003.07.014.

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31

Ford, W. T., Rama Chandran, and H. Turk. "Catalysts supported on polymer colloids." Pure and Applied Chemistry 60, no. 3 (January 1, 1988): 395–400. http://dx.doi.org/10.1351/pac198860030395.

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32

Richards, R. W. "Future directions of polymer colloids." Reactive Polymers 10, no. 1 (January 1989): 92–93. http://dx.doi.org/10.1016/0923-1137(89)90014-6.

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33

Lamb, David, James F. Anstey, Doug-Youn Lee, Christopher M. Fellows, Michael J. Monteiro, and Robert G. Gilbert. "Rational design of polymer colloids." Macromolecular Symposia 174, no. 1 (September 2001): 13–28. http://dx.doi.org/10.1002/1521-3900(200109)174:1<13::aid-masy13>3.0.co;2-z.

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34

Bénédicte, Thiébaut. "Palladium Colloids Stabilised in Polymer." Platinum Metals Review 48, no. 2 (April 1, 2004): 62–63. http://dx.doi.org/10.1595/003214004x4826263.

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35

Marschelke, Claudia, Olga Diring, and Alla Synytska. "Reconfigurable assembly of charged polymer-modified Janus and non-Janus particles: from half-raspberries to colloidal clusters and chains." Nanoscale Advances 1, no. 9 (2019): 3715–26. http://dx.doi.org/10.1039/c9na00522f.

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pH-triggered, reconfigurable assembly of binary mixtures of hybrid hairy Janus and non-Janus colloids to half-raspberry-like constructs, colloidal clusters and colloidal chains depending on particle size ratio and numerical ratio.

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36

Jin, Young-Jae, and Jinyoung Park. "QCM-Based HCl Gas Sensors Using Spin-Coated Aminated Polystyrene Colloids." Polymers 12, no. 7 (July 17, 2020): 1591. http://dx.doi.org/10.3390/polym12071591.

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Hydrogen chloride (HCl) gas is highly toxic to the human body. Therefore, HCl gas detection sensors should be installed at workplaces where trace HCl gas is continuously generated. Even though various polymer-based HCl-gas-sensing films have been developed, simpler and novel sensing platforms should be developed to ensure the cost effectiveness and reusability of the sensing platforms. Therefore, we present a simple strategy to fabricate reusable HCl-gas-sensing platforms using aminated polystyrene (a-PS) colloids and investigate their sensitivity, reusability, and selectivity using a quartz c

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37

HIMMI, MUSTAPHA, and LAILA MOHAMMADI. "EXTENSIVE STUDY OF INTERACTION FORCE BETWEEN SPHERICAL COLLOIDS AND STAR POLYMERS." International Journal of Modern Physics B 26, no. 17 (June 21, 2012): 1250105. http://dx.doi.org/10.1142/s0217979212501056.

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We consider a system consisting of very small colloidal particles clothed each by f end-grafted flexible polymer chains we regarded as star polymers, and hard spherical colloidal particles in a good solvent. Our main objective is to determine the expression of the interaction force between a spherical colloid and a star polymer as a function of distance between them. We limit ourselves to the case where the star polymer is smaller than the colloid. In the first part, the system is dissolved in a melt of short linear chains of polymerization degree P<N, where N denotes the polymerization deg

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38

Hidalgo-Álvarez, R., A. Martín, A. Fernández, D. Bastos, F. Martínez, and F. J. de las Nieves. "Electrokinetic properties, colloidal stability and aggregation kinetics of polymer colloids." Advances in Colloid and Interface Science 67 (September 1996): 1–118. http://dx.doi.org/10.1016/0001-8686(96)00297-7.

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39

Ortega-Vinuesa, J. L., A. Martı́n-Rodrı́guez, and R. Hidalgo-Álvarez. "Colloidal Stability of Polymer Colloids with Different Interfacial Properties: Mechanisms." Journal of Colloid and Interface Science 184, no. 1 (December 1996): 259–67. http://dx.doi.org/10.1006/jcis.1996.0619.

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Martens, C. M., R. Tuinier, and M. Vis. "Depletion interaction mediated by semiflexible polymers." Journal of Chemical Physics 157, no. 15 (October 21, 2022): 154102. http://dx.doi.org/10.1063/5.0112015.

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We present a simple mean-field theory to describe the polymer-mediated depletion attraction between colloidal particles that accounts for the polymer’s chain stiffness. We find that for fixed polymer radius of gyration and volume fraction, the strength of this attraction increases with increasing chain stiffness in both dilute and semidilute concentration regimes. In contrast, the range of attraction monotonically decreases with chain stiffness in the dilute regime, while it attains a maximum in the semidilute regime. The obtained analytical expressions for the depletion interaction were compa

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41

van Ravensteijn, Bas G. P., and Willem K. Kegel. "Versatile procedure for site-specific grafting of polymer brushes on patchy particles via atom transfer radical polymerization (ATRP)." Polymer Chemistry 7, no. 16 (2016): 2858–69. http://dx.doi.org/10.1039/c6py00450d.

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Combining chemically anisotropic colloids with Surface-Initiated ATRP enables for site-specific grafting of p(NIPAM) brushes. The resulting, partially grafted particles are employed as colloidal building blocks for finite-sized clusters.

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Kramer, Thomas, Stephanie Scholz, Michael Maskos, and Klaus Huber. "Colloid–polymer mixtures in solution with refractive index matched acrylate colloids." Journal of Colloid and Interface Science 279, no. 2 (November 2004): 447–57. http://dx.doi.org/10.1016/j.jcis.2004.06.102.

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Lim, Wei Kang, and Alan R. Denton. "Influence of polymer shape on depletion potentials and crowding in colloid–polymer mixtures." Soft Matter 12, no. 8 (2016): 2247–52. http://dx.doi.org/10.1039/c5sm02863a.

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44

Heijnen, Sandrine M. F., Patrick van Vliet, Bonny W. M. Kuipers, Albert P. Philipse, Andrei V. Petukhov, and Samia Ouhajji. "Depletion-Induced Chiral Chain Formation of Magnetic Spheres." Materials 14, no. 3 (January 21, 2021): 507. http://dx.doi.org/10.3390/ma14030507.

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Experimental evidence is presented for the spontaneous formation of chiral configurations in bulk dispersions of magnetized colloids that interact by a combination of anisotropic dipolar interactions and isotropic depletion attractions. The colloids are superparamagnetic silica spheres, magnetized and aligned by a carefully tuned uniform external magnetic field; isotropic attractions are induced by using poly(ethylene oxide) polymers as depleting agents. At specific polymer concentrations, sphere chains wind around each other to form helical structures–of the type that previously have only bee

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45

Barisci, J. N., P. C. Innis, L. A. P. Kane-Maguire, I. D. Norris, and G. G. Wallace. "Preparation of chiral conducting polymer colloids." Synthetic Metals 84, no. 1-3 (January 1997): 181–82. http://dx.doi.org/10.1016/s0379-6779(97)80703-5.

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Barisci, J., T. Mansouri, G. Spinks, G. Wallace, D. Y. Kim, and C. Y. Kim. "Electrochemical Preparation of Conducting Polymer Colloids." Synthetic Metals 84, no. 1-3 (January 1997): 361–62. http://dx.doi.org/10.1016/s0379-6779(97)80782-5.

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Monteiro, Michael J., and Michael F. Cunningham. "Polymer Colloids: Synthesis Fundamentals to Applications." Biomacromolecules 21, no. 11 (November 9, 2020): 4377–78. http://dx.doi.org/10.1021/acs.biomac.0c01462.

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von Ferber, C., Yu Holovatch, A. Jusufi, C. N. Likos, H. Löwen, and M. Watzlawek. "Colloids with polymer stars: the interaction." Journal of Molecular Liquids 93, no. 1-3 (September 2001): 151–54. http://dx.doi.org/10.1016/s0167-7322(01)00223-9.

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Morozova, Tatiana I., and Arash Nikoubashman. "Surface Activity of Soft Polymer Colloids." Langmuir 35, no. 51 (December 2019): 16907–14. http://dx.doi.org/10.1021/acs.langmuir.9b03202.

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Carter, Steve, Shui-Yu Lu, and Stephen Rimmer. "Core-shell Molecular Imprinted Polymer Colloids." Supramolecular Chemistry 15, no. 3 (April 1, 2003): 213–20. http://dx.doi.org/10.1080/1061027031000078284.

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