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Journal articles on the topic 'Non-spherical nanoparticles'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Singh, Himanshi, Debes Ray, Joachim Kohlbrecher, and Vinod K. Aswal. "Interaction of nanoparticles with non-spherical micelles and bilayers." Journal of Applied Physics 131, no. 15 (April 21, 2022): 154701. http://dx.doi.org/10.1063/5.0084795.

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Interaction of different-sized anionic silica nanoparticles with non-spherical micelles and bilayers of non-ionic surfactant C12E10 has been studied by small-angle neutron scattering (SANS). The non-ionic surfactant C12E10 in aqueous solution self-assembles to form core–shell spherical micelles. Different means (temperature, salts, and alcohols) have been examined to induce the structural transition of micelles from spherical to non-spherical and bilayer formation. The dehydration from micellar shell leads to such transition in the cases of increasing temperature and selective salt (e.g., KF). On the other hand, for alcohols, spherical to non-spherical micellar transition or bilayer formation arises for long-chain length alcohols CnOH ( n > 5) because of the mixed micelles formation of alcohol with surfactant. From the different ways to alter the micellar morphology, transitions obtained by alcohols were found to be the best suited for nanoparticle–surfactant solution as they do not influence the interactions between nanoparticle and surfactant and among nanoparticles. It is found that the shorter chain length alcohols (CnOH, n ≤ 5) interact with nanoparticles via the adsorption of individual micelles while the non-spherical micelles and bilayers of surfactant formed in the presence of long-chain length alcohols rearrange themselves to attach onto the nanoparticles. SANS with an advantage of contrast variation (contrast matching silica nanoparticles with solvent) provides the evidence of bilayer formation around nanoparticles. The concentration effect of long-chain length alcohol on micelle morphology and subsequently on the nanoparticle–surfactant system is also examined. It is found that the adsorption of surfactant bilayer structures is prominent in the case of larger particle size due to flattened curvature.

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2

Li, Xiaoyin, Fangyang Yuan, Wenma Tian, Chenlong Dai, Xinjun Yang, Dongxiang Wang, Jiyun Du, Wei Yu, and Huixin Yuan. "Heat Transfer Enhancement of Nanofluids with Non-Spherical Nanoparticles: A Review." Applied Sciences 12, no. 9 (May 9, 2022): 4767. http://dx.doi.org/10.3390/app12094767.

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This article reviews the heat transfer enhancement of nanofluids with non-spherical nanoparticles. We divided the non-spherical nanoparticles suspended in nanofluids into three categories based on the dimension of geometric particle structure. Based on the measured data in experimental studies, we then evaluated the shape effect of non-spherical nanoparticles on thermal conductivity and convective heat transfer enhancement of nanofluids. Recent studies explored the numerical predictions and related heat transfer mechanisms. Due to large aspect ratios, thermal conductivity is abnormally enhanced only for nanofluids with carbon nanotubes/nanofibers/nanowires. The approximate enhancement effect exerted by three types of non-spherical nanoparticles on thermal conductivity was 4.5:2.5:1. Thermal conductivity enhancement per concentration was larger for nanorods/ellipsoids with small aspect ratios. The convective heat transfer coefficient was increased by suspending non-spherical nanoparticles in the base fluid. Consequently, no significant thermohydraulic performance was discovered for convective heat transfer of non-spherical nanoparticle nanofluid flow, specifically for turbulent flows, due to increased pumping power. However, the temperature and particle concentration effect on convective heat transfer remains unclear. In addition, no perfect model for predicting the thermal conductivity and convective heat transfer of non-spherical nanoparticle nanofluids has been reported.

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3

Tréguer-Delapierre, M., J. Majimel, S. Mornet, E. Duguet, and S. Ravaine. "Synthesis of non-spherical gold nanoparticles." Gold Bulletin 41, no. 2 (June 2008): 195–207. http://dx.doi.org/10.1007/bf03216597.

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4

Niaz, Saad, Ben Forbes, and Bahijja Tolulope Raimi-Abraham. "Exploiting Endocytosis for Non-Spherical Nanoparticle Cellular Uptake." Nanomanufacturing 2, no. 1 (February 1, 2022): 1–16. http://dx.doi.org/10.3390/nanomanufacturing2010001.

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Several challenges exist for successful nanoparticle cellular uptake—they must be able to cross many physical barriers to reach their target and overcome the cell membrane. A strategy to overcome this challenge is to exploit natural uptake mechanisms namely passive and endocytic (i.e., clathrin- and caveolin-dependent/-independent endocytosis, macropinocytosis and phagocytosis). The influence of nanoparticle material and size is well documented and understood compared to the influence of nanomaterial shape. Generally, nanoparticle shape is referred to as being either spherical or non-spherical and is known to be an important factor in many processes. Nanoparticle shape-dependent effects in areas such as immune response, cancer drug delivery, theranostics and overall implications for nanomedicines are of great interest. Studies have looked at the cellular uptake of spherical NPs, however, fewer in comparison have investigated the cellular uptake of non-spherical NPs. This review explores the exploitation of endocytic pathways for mainly inorganic non-spherical (shapes of focus include rod, triangular, star-shaped and nanospiked) nanoparticles cellular uptake. The role of mathematical modelling as predictive tools for non-spherical nanoparticle cellular uptake is also reviewed. Both quantitative structure-activity relationship (QSAR) and continuum membrane modelling have been used to gain greater insight into the cellular uptake of complex non-spherical NPs at a greater depth difficult to achieve using experimental methods.

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5

Zhu, Xingjun, Chau Vo, Madelynn Taylor, and Bryan Ronain Smith. "Non-spherical micro- and nanoparticles in nanomedicine." Materials Horizons 6, no. 6 (2019): 1094–121. http://dx.doi.org/10.1039/c8mh01527a.

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6

Köhler, Johann, and Andrea Knauer. "The Mixed-Electrode Concept for Understanding Growth and Aggregation Behavior of Metal Nanoparticles in Colloidal Solution." Applied Sciences 8, no. 8 (August 10, 2018): 1343. http://dx.doi.org/10.3390/app8081343.

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The growth and aggregation behavior of metal nanoparticles can be modulated by surfactants and different other additives. Here the concept of how open-circuit mixed electrodes helps to understand the electrical aspects of nanoparticle growth and the consequences for the particle geometries is discussed. A key issue is the self-polarization effect of non-spherical metal nanoparticles, which causes a local decoupling of anodic and partial processes and asymmetry in the local rates of metal deposition. These asymmetries can contribute to deciding to the growth of particles with high aspect ratios. The interpretation of electrochemical reasons for particle growth and behavior is supported by experimental results of nanoparticle syntheses supported by microfluidics which can supply high yields of non-spherical nanoparticles and colloidal product solutions of high homogeneity.

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7

Smith, Gregory N., Laura L. E. Mears, Sarah E. Rogers, and Steven P. Armes. "Synthesis and electrokinetics of cationic spherical nanoparticles in salt-free non-polar media." Chemical Science 9, no. 4 (2018): 922–34. http://dx.doi.org/10.1039/c7sc03334f.

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The electrokinetics of cationic sterically-stabilized diblock copolymer nanoparticles prepared in salt-free non-polar media depend on whether the charge is located in the stabilizer shell or in the nanoparticle core.

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8

Zhu, Xingjun, Chau Vo, Madelynn Taylor, and Bryan Ronain Smith. "Correction: Non-spherical micro- and nanoparticles in nanomedicine." Materials Horizons 7, no. 5 (2020): 1436. http://dx.doi.org/10.1039/d0mh90013c.

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9

Wautelet, M., J. P. Dauchot, and M. Hecq. "On the phase diagram of non-spherical nanoparticles." Journal of Physics: Condensed Matter 15, no. 21 (May 16, 2003): 3651–55. http://dx.doi.org/10.1088/0953-8984/15/21/313.

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10

Little, Christopher A., Christopher Batchelor-McAuley, Neil P. Young, and Richard G. Compton. "Shape and size of non-spherical silver nanoparticles: implications for calculating nanoparticle number concentrations." Nanoscale 10, no. 34 (2018): 15943–47. http://dx.doi.org/10.1039/c8nr06062b.

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11

Malakhovsky, Pavel O., Alexey V. Rashkevich, Egor A. Minakov, and Mikhail Artemyev. "Aggregative stability of colloidal 3D and 2D silver nanoparticles, stabilised by 11-mercaptoundecanoic acid, in the presence of singly charged cations." Journal of the Belarusian State University. Chemistry, no. 1 (March 16, 2022): 3–17. http://dx.doi.org/10.33581/2520-257x-2022-1-3-17.

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We studied the aggregative stability of colloidal silver quasi-spherical nanoparticles and two-dimensional nanoplates, stabilised by 11-mercaptoundecanoic acid, in the presence of phosphate buffers containing different singly charged cations (Li+ , Na+ , K+ , Cs+) and tris-HCl at pH 8.0 and concentration 0.02 mol/L which mimics the carbodiimide conjugation conditions of nanoparticles with biomolecules. Aggregation of silver nanoplates occurs in the presence of Na-phosphate buffer whereas at the same conditions the quasi-spherical nanoparticles retain colloidal stability. The difference in colloidal stability between 3D and 2D silver nanoparticles is due to the increase of the apparent acid dissociation constant on the nanoplates’ basal faces and the subsequent increase in specific bridging interactions nanoparticle – cation – nanoparticle which can be eliminated by introducing of non-ionic spacer (11-mercapto-1-undecanol) in the ligand layer. Silver nanoplates with mixed ligand layer have increased colloidal stability across the pH.

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12

Swamulu, A. Brahma, S. Venugopal Rao, and G. Krishna Podagatlapalli. "Non-spherical aluminum nanoparticles fabricated using picosecond laser ablation." International Journal of Minerals, Metallurgy and Materials 27, no. 7 (July 2020): 980–86. http://dx.doi.org/10.1007/s12613-020-2032-1.

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13

Yang, Zhongqiang, Wilhelm T. S. Huck, Stuart M. Clarke, Ali R. Tajbakhsh, and Eugene M. Terentjev. "Shape-memory nanoparticles from inherently non-spherical polymer colloids." Nature Materials 4, no. 6 (May 15, 2005): 486–90. http://dx.doi.org/10.1038/nmat1389.

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14

Suvarli, Narmin, Max Frentzel, Jürgen Hubbuch, Iris Perner-Nochta, and Michael Wörner. "Synthesis of Spherical Nanoparticle Hybrids via Aerosol Thiol-Ene Photopolymerization and Their Bioconjugation." Nanomaterials 12, no. 3 (February 8, 2022): 577. http://dx.doi.org/10.3390/nano12030577.

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Hybrid nanomaterials possess the properties of both organic and inorganic components and find applications in various fields of research and technology. In this study, aerosol photopolymerization is used in combination with thiol-ene chemistry to produce silver poly(thio-ether) hybrid nanospheres. In aerosol photopolymerization, a spray solution of monomers is atomized, forming a droplet aerosol, which then polymerizes, producing spherical polymer nanoparticles. To produce silver poly(thio-ether) hybrids, silver nanoparticles were introduced to the spray solution. Diverse methods of stabilization were used to produce stable dispersions of silver nanoparticles to prevent their agglomeration before the photopolymerization process. Successfully stabilized silver nanoparticle dispersion in the spray solution subsequently formed nanocomposites with non-agglomerated silver nanoparticles inside the polymer matrix. Nanocomposite particles were analyzed via scanning and transmission electron microscopy to study the degree of agglomeration of silver nanoparticles and their location inside the polymer spheres. The nanoparticle hybrids were then introduced onto various biofunctionalization reactions. A two-step bioconjugation process was developed involving the hybrid nanoparticles: (1) conjugation of (biotin)-maleimide to thiol-groups on the polymer network of the hybrids, and (2) biotin-streptavidin binding. The biofunctionalization with gold-nanoparticle-conjugates was carried out to confirm the reactivity of -SH groups on each conjugation step. Fluorescence-labeled biomolecules were conjugated to the spherical nanoparticle hybrids (applying the two-step bioconjugation process) verified by Fluorescence Spectroscopy and Fluorescence Microscopy. The presented research offers an effective method of synthesis of smart systems that can further be used in biosensors and various other biomedical applications.

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15

Yu, Leyuan, Dong Liu, and Frank Botz. "Laminar convective heat transfer of alumina-polyalphaolefin nanofluids containing spherical and non-spherical nanoparticles." Experimental Thermal and Fluid Science 37 (February 2012): 72–83. http://dx.doi.org/10.1016/j.expthermflusci.2011.10.005.

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16

Leizou, Kaywood Elijah, and Muhammad Aqeel Ashraf. "GREEN SYNTHESIS APPROACH, CHARACTERIZATION, AND APPLICATIONS OF MgO NANO PARTICLES USING CURRY LEAF (MURRAYA KOENIGII)." Acta Scientifica Malaysia 6, no. 1 (2022): 06–09. http://dx.doi.org/10.26480/asm.01.2022.06.09.

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Nanotechnology has emerged as a state-of-the-art and cutting-edge technology with multifarious applications in a wide array of fields. The goal of this study was to create magnesium oxide nanoparticles using an aqueous extract of curry leaves (murraya koenigii or bergera koenigii). The morphology, elemental content, shape, and size of the produced MgO nanoparticles were determined using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDX). According to the SEM data, the MgO nanoparticle forms were well disseminated, with a spherical shape and particle sizes ranging from 20 to 100 nm. While the EDX pattern infers the sample’s elemental composition, the average occurrence of Mg was 32.45 percent. Plant extracts were used to successfully produce MgO nanoparticlse, which is an essential alternative technique because it is non-toxic, biocompatible, and environmentally benign.

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17

Abzaeva, Klavdia A., Boris G. Sukhov, Spartak S. Khutsishvili, Elena B. Tarabukina, Lev E. Zelenkov, Anna V. Nevezhina, and Tat’yana V. Fadeeva. "Spontaneous Transformation of Biomedical Polymeric Silver Salt into a Nanocomposite: Physical–Chemical and Antimicrobial Properties Dramatically Depend on the Initial Preparation State." International Journal of Molecular Sciences 23, no. 18 (September 19, 2022): 10963. http://dx.doi.org/10.3390/ijms231810963.

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An antimicrobial polyacrylic silver salt (freshly prepared, stored for one year and model-aged) was studied by physical–chemical techniques for nanoparticle detection. In all cases, this salt represents a composite of radical-enriched macromolecules and silver(0) nanoparticles. As time passed, the initial small spherical nanoparticles were converted into larger non-spherical silver nanoparticles. The initial highly water-soluble antimicrobial solid nanocomposite almost loses its solubility in water and cannot be used as an antimicrobial agent. Unlike insoluble solid silver polyacrylate, its freshly prepared aqueous solution retains a liquid-phase consistency after one year as well as pronounced antimicrobial properties. The mechanism of these spontaneous and model-simulated processes was proposed. These results have attracted attention for officinal biomedicinal silver salts as complex radical-enriched nanocomposite substances; they also indicate contrasting effects of silver polymeric salt storing in solid and solution forms that dramatically influence antimicrobial activity.

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18

Skłodowski, Karol, Sylwia Joanna Chmielewska, Joanna Depciuch, Piotr Deptuła, Ewelina Piktel, Tamara Daniluk, Magdalena Zakrzewska, et al. "Ceragenin-Coated Non-Spherical Gold Nanoparticles as Novel Candidacidal Agents." Pharmaceutics 13, no. 11 (November 16, 2021): 1940. http://dx.doi.org/10.3390/pharmaceutics13111940.

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Background: Infections caused by Candida spp. have become one of the major causes of morbidity and mortality in immunocompromised patients. Therefore, new effective fungicides are urgently needed, especially due to an escalating resistance crisis. Methods: A set of nanosystems with rod- (AuR), peanut- (AuP), and star-shaped (AuS) metal cores were synthesized. These gold nanoparticles were conjugated with ceragenins CSA-13, CSA-44, and CSA-131, and their activity was evaluated against Candida strains (n = 21) through the assessment of MICs (minimum inhibitory concentrations)/MFCs (minimum fungicidal concentrations). Moreover, in order to determine the potential for resistance development, serial passages of Candida cells with tested nanosystems were performed. The principal mechanism of action of Au NPs was evaluated via ROS (reactive oxygen species) generation assessment, plasma membrane permeabilization, and release of the protein content. Finally, to evaluate the potential toxicity of Au NPs, the measurement of hemoglobin release from red blood cells (RBCs) was carried out. Results: All of the tested nanosystems exerted a potent candidacidal activity, regardless of the species or susceptibility to other antifungal agents. Significantly, no resistance development after 25 passages of Candida cells with AuR@CSA-13, AuR@CSA-44, and AuR@CSA-131 nanosystems was observed. Moreover, the fungicidal mechanism of action of the investigated nanosystems involved the generation of ROS, damage of the fungal cell membrane, and leakage of intracellular contents. Notably, no significant RBCs hemolysis at candidacidal doses of tested nanosystems was detected. Conclusions: The results provide rationale for the development of gold nanoparticles of rod-, peanut-, and star-shaped conjugated with CSA-13, CSA-44, and CSA-131 as effective candidacidal agents.

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19

Brzobohatý, Oto, Martin Šiler, Jan Trojek, Lukáš Chvátal, Vítězslav Karásek, and Pavel Zemánek. "Non-spherical gold nanoparticles trapped in optical tweezers: shape matters." Optics Express 23, no. 7 (March 23, 2015): 8179. http://dx.doi.org/10.1364/oe.23.008179.

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20

Ahmed, Dewan Hasan, and Hyung Jin Sung. "Optical Forces on Non-Spherical Nanoparticles Trapped by Optical Waveguides." International Journal of Optomechatronics 5, no. 3 (July 2011): 217–33. http://dx.doi.org/10.1080/15599612.2011.604118.

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21

Mukhina, Ksenia D., and Sergey A. Chivilikhin. "The influence of non-spherical nanoparticles’ shape on sedimentation process." Journal of Physics: Conference Series 741 (August 2016): 012181. http://dx.doi.org/10.1088/1742-6596/741/1/012181.

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22

Nogueira, Élcio. "Entropy generation analysis in a gasket plate heat exchanger using non-spherical shape of alumina boehmite nanoparticles." Ovidius University Annals of Chemistry 33, no. 1 (January 1, 2022): 41–49. http://dx.doi.org/10.2478/auoc-2022-0006.

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Abstract The analysis deals with the thermo-hydraulic performance of a Gasket Plate Heat Exchanger used for cooling vegetable oils with a water-ethylene glycol 50% and volume fractions of non-spherical nanoparticles mixture as a refrigerant. The heat exchanger has 75 plates with a chevron angle equal to 30º. The Reynolds number of the refrigerant varies from 80 to 1530. The Reynolds number of the sunflower vegetable oil is fixed and equal to 30. The non-spherical nanoparticles used for analysis are platelet, cylindrical and brick types. Graphical results are presented for global heat transfer coefficient, heat capacity ratio, heat transfer rate, outlet temperatures, thermal and viscous entropy generation rate, and Bejan thermodynamic number. The results obtained allow us to conclude that it is possible to work with low relative flow rates using non-spherical nanoparticles, emphasizing platelet nanoparticles. The entropy generations analysis shows that very high flow rates of the refrigerant dissipate much of the energy in viscous form and do not contribute to oil cooling, with a consequent increase in the heat exchanger operating costs.

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23

Tomchuk, P. M., and V. N. Starkov. "Influence of Shape Spread in an Ensemble of Metal Nanoparticles on Their Optical Properties." Ukrainian Journal of Physics 63, no. 3 (April 12, 2018): 204. http://dx.doi.org/10.15407/ujpe63.3.204.

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The theoretical basis of the work consists in that the dissipative processes in non-spherical nanoparticles, whose sizes are smaller than the mean free path of electrons, are characterized by a tensor quantity, whose diagonal elements together with the depolarization coefficients determine the half-widths of plasma resonances. Accordingly, the averaged characteristics are obtained for an ensemble of metal nanoparticles with regard for the influence of the nanoparticle shape on the depolarization coefficients and the components of the optical conductivity tensor. Three original variants of the nanoparticle shape distribution function are proposed on the basis of the joint application of the Gauss and “cap” functions.

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24

Yu, Qingfen, Sameh Othman, Sabyasachi Dasgupta, Thorsten Auth, and Gerhard Gompper. "Nanoparticle wrapping at small non-spherical vesicles: curvatures at play." Nanoscale 10, no. 14 (2018): 6445–58. http://dx.doi.org/10.1039/c7nr08856f.

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Wrapping of nanoparticles that enter and exit vesicles depends on several important parameters, such as particle size and shape, vesicle size and reduced volume, and membrane spontaneous curvature. This implies complex wrapping behavior where particle wrapping transitions and vesicle shape transitions are intimately coupled.

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25

Cornel, E. J., P. S. O'Hora, T. Smith, D. J. Growney, O. O. Mykhaylyk, and S. P. Armes. "SAXS studies of the thermally-induced fusion of diblock copolymer spheres: formation of hybrid nanoparticles of intermediate size and shape." Chemical Science 11, no. 17 (2020): 4312–21. http://dx.doi.org/10.1039/d0sc00569j.

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Dilute dispersions of poly(lauryl methacrylate)-poly(benzyl methacrylate) diblock copolymer spheres of differing mean diameter are mixed and thermally annealed at 150 °C to produce either spherical or non-spherical nanoparticles of intermediate size.

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26

Mohan, Minu, Ramkumar Sekar, and Manoj A. G. Namboothiry. "Understanding the effects of shape, material and location of incorporation of metal nanoparticles on the performance of plasmonic organic solar cells." RSC Advances 10, no. 44 (2020): 26126–32. http://dx.doi.org/10.1039/d0ra04076b.

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27

Bobbi, Elena, Bassem Sabagh, Sally-Ann Cryan, James A. Wilson, and Andreas Heise. "Anisotropic polymer nanoparticles with solvent and temperature dependent shape and size from triblock copolymers." Polymer Chemistry 10, no. 25 (2019): 3436–43. http://dx.doi.org/10.1039/c9py00363k.

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28

Gong Lei, 巩蕾, and 吴振森 Wu Zhensen. "Analysis of Light Scattering about Slightly Non-Spherical Nanoparticles on Wafers." Chinese Journal of Lasers 38, no. 1 (2011): 0110001. http://dx.doi.org/10.3788/cjl201138.0110001.

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29

Mathaes, Roman, Gerhard Winter, Ahmed Besheer, and Julia Engert. "Non-spherical micro- and nanoparticles: fabrication, characterization and drug delivery applications." Expert Opinion on Drug Delivery 12, no. 3 (October 18, 2014): 481–92. http://dx.doi.org/10.1517/17425247.2015.963055.

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30

Xia, Yunsheng. "Optical sensing and biosensing based on non-spherical noble metal nanoparticles." Analytical and Bioanalytical Chemistry 408, no. 11 (December 9, 2015): 2813–25. http://dx.doi.org/10.1007/s00216-015-9203-3.

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31

Rubín, J., F. Jiménez-Villacorta, J. Bartolomé, and C. Prieto. "CEMS spectra of non-spherical nanoparticles in oxidized iron thin films." Hyperfine Interactions 185, no. 1-3 (July 2008): 33–38. http://dx.doi.org/10.1007/s10751-008-9805-7.

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Kaplan, Meryem, Kıvılcım Öztürk, Süleyman Can Öztürk, Ece Tavukçuoğlu, Güneş Esendağlı, and Sema Calis. "Effects of Particle Geometry for PLGA-Based Nanoparticles: Preparation and In Vitro/In Vivo Evaluation." Pharmaceutics 15, no. 1 (January 3, 2023): 175. http://dx.doi.org/10.3390/pharmaceutics15010175.

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The physicochemical properties (size, shape, zeta potential, porosity, elasticity, etc.) of nanocarriers influence their biological behavior directly, which may result in alterations of the therapeutic outcome. Understanding the effect of shape on the cellular interaction and biodistribution of intravenously injected particles could have fundamental importance for the rational design of drug delivery systems. In the present study, spherical, rod and elliptical disk-shaped PLGA nanoparticles were developed for examining systematically their behavior in vitro and in vivo. An important finding is that the release of the encapsulated human serum albumin (HSA) was significantly higher in spherical particles compared to rod and elliptical disks, indicating that the shape can make a difference. Safety studies showed that the toxicity of PLGA nanoparticles is not shape dependent in the studied concentration range. This study has pioneering findings on comparing spherical, rod and elliptical disk-shaped PLGA nanoparticles in terms of particle size, particle size distribution, colloidal stability, morphology, drug encapsulation, drug release, safety of nanoparticles, cellular uptake and biodistribution. Nude mice bearing non-small cell lung cancer were treated with 3 differently shaped nanoparticles, and the accumulation of nanoparticles in tumor tissue and other organs was not statistically different (p > 0.05). It was found that PLGA nanoparticles with 1.00, 4.0 ± 0.5, 7.5 ± 0.5 aspect ratios did not differ on total tumor accumulation in non-small cell lung cancer.

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Asha, S. K., Vijaylaxmi T. Talawar, and M. M. Bhatti. "Entropy Generation and Radiation Analysis on Peristaltic Transport of Hyperbolic Tangent Fluid with Hybrid Nanoparticle Through an Endoscope." Journal of Nanofluids 12, no. 3 (April 1, 2023): 723–37. http://dx.doi.org/10.1166/jon.2023.1993.

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The current study explores the impact of entropy generation, thermal jump, radiation, and inclined magnetic field on the peristaltic transport of hyperbolic tangent fluid containing molybdenum disulfide and silver nanoparticles through an endoscope with a long wavelength and low Reynolds number assumptions. Between two coaxial tubes, a non-Newtonian hyperbolic tangent fluid with silver nanoparticles is considered. The Second law of thermodynamics is used to examine the entropy generation. The Homotopy perturbation method (HPM) is applied to describe the solution of nonlinear partial differential equations. We were able to arrive at analytical solutions for velocity, temperature, and nanoparticle concentration. In the end, the impact of various physical parameters on temperature, nanoparticle concentration, velocity, entropy generation, and Bejan number was graphically depicted. The significant outcome of the present study is that the impact of Hartmann number and Brownian motion parameter declines the velocity profile, but the thermal Grashoff number enhances velocity, whereas Platelet-shaped nanoparticles achieve a higher speed as compare to Spherical-shaped nanoparticles.

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Rostami, Elham, Soheila Kashanian, and Mehran Askari. "The Effect of Ultrasound Wave on Levothyroxine Release from Chitosan Nanoparticles." Advanced Materials Research 829 (November 2013): 284–88. http://dx.doi.org/10.4028/www.scientific.net/amr.829.284.

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A nanoparticle polymer has been developed as a potential platform for drug delivery. Chitosan nanoparticles were prepared with tripolyphosphate (TPP) by the ionic crosslinking method. The particle size of chitosan nanoparticles was in the range of 190-250 nm and encapsulation efficiencies of levothyroxine were 85%. The particle size was determined by photon correlation spectroscopy (PCS). Shape and surface morphology were determined by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). They revealed fairly spherical shape of nanoparticles. A non-invasive way to deliver drugs to the deepest parts of the human body is ultrasound. To study how ultrasound causes levothyroxine to be released from chitosan nanoparticles, cumulative release was examined. In this report, we explore the effect of ultrasound and tripolyphosphate (TPP) concentration on release behavior of levothyroxine from chitosan nanoparticles. The drug release from chitosan nanoparticles was enhanced using the ultrasound wave.

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Vodnik, Vesna V., Dušan K. Božanić, Nataša Bibić, Zoran V. Šaponjić, and Jovan M. Nedeljković. "Optical Properties of Shaped Silver Nanoparticles." Journal of Nanoscience and Nanotechnology 8, no. 7 (July 1, 2008): 3511–15. http://dx.doi.org/10.1166/jnn.2008.144.

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The influence of shape and dielectric property of surrounding media on surface plasmon absorption band of silver nanoparticles was studied. Spherical silver nanoparticles (d = 5.6 nm) synthesized in water using NaBH4 as a reducing agent are transferred in non-polar solvent (chloroform) with phase-transfer reagent oleylamine. The absorption spectrum of oleylamine-capped silver nanoparticles dispersed in chloroform shows a strong surface plasmon resonance band that is 19 nm red-shifted compared to unmodified particles in water. The values for peak position and corresponding half widths are compared with theoretical calculations based on Mie theory. Prismatic and plate-like silver nanoparticles were synthesized in water using trisodium citrate as a reducing agent and cetyltrimethylammonium bromide as stabilizer. Due to structural anisotropy of prismatic and plate-like silver nanoparticles three surface plasmon resonance bands were observed in absorption spectrum. Nanocomposites consisting of non-spherical silver nanoparticles and polyvinyl alcohol exhibit different optical properties compared to water colloid. Instead of three surface plasmon bands, nanocomposite film has only one peak at 460 nm. Reason for appearance of single surface plasmon resonance band in nanocomposite film was discussed according to Maxwell-Garnet theory.

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Gorelik, Vladimir S., Nikolay V. Tcherniega, Mikhail A. Shevchenko, Alexander Yu Pyatyshev, Sofya F. Umanskaya, Andrey V. Voropinov, and Dongxue Bi. "Stimulated boson-peak light scattering in an aqueous suspension of spherical nanoparticles of amorphous SiO2 of similar sizes." Soft Matter 16, no. 38 (2020): 8848–53. http://dx.doi.org/10.1039/d0sm01180k.

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Prileszky, Tamás A., and Eric M. Furst. "Magnetite nanoparticles program the assembly, response, and reconfiguration of structured emulsions." Soft Matter 15, no. 7 (2019): 1529–38. http://dx.doi.org/10.1039/c8sm01931b.

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Endoskeletal droplets—non-spherical emulsion droplets that respond to external stimuli with shape change—are modified with ferromagnetic iron oxide nanoparticles to make them susceptible to magnetic fields.

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Zvyagin, Andrey I., Aleksey S. Perepelitsa, Mariya S. Lavlinskaya, Oleg V. Ovchinnikov, Mikhail S. Smirnov, and Rashid A. Ganeev. "Nonlinear optical absorption of non-spherical silver nanoparticles and organic dyes mixtures." EPJ Web of Conferences 190 (2018): 04016. http://dx.doi.org/10.1051/epjconf/201819004016.

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We study the features of the nonlinear optical response of silver nanoparticles (Ag NPs) of spherical and triangular shapes synthesized using a citrate-borohydride approach and their mixtures with methylene blue (MB+). The Z-scans at the wavelengths of 532 nm using 10 ns pulses were used to analyze the nonlinear optical absorption of MB+ solutions, Ag NPs of different morphology, particularly, the concurrence of saturable and reverse saturable absorption in the solution of triangular Ag NP and MB+. We show the significant contribution to the increasing in the normalized transmittance accomplished by photochemical degradation of the non-spherical Ag NPs (extinction maximum of 600 nm) and transformation into the spherical ones (extinction maximum of 400 nm). The nonlinear light scattering is also analyzed, which showed the contribution to the variation of the sample transmission when it approaches the focal plane. It is shown that the nonlinear optical response is not additive in the mixture of Ag NPs and MB+. The increasing of the nonlinear absorption is probably due to both a change in the population of the triplet states of the dye and the efficiency of photochemical degradation of NPs in the presence of MB+.

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Joshi, Ritika, Nilay Sebat, Kai Chi, Madani Khan, Ken I. Johnson, Abdulrahman G. Alhamzani, M. A. Habib, Tom Lindstrom, and Benjamin S. Hsiao. "Low Fouling Nanostructured Cellulose Membranes for Ultrafiltration in Wastewater Treatment." Membranes 13, no. 2 (January 23, 2023): 147. http://dx.doi.org/10.3390/membranes13020147.

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Ultrafiltration (UF) is a common technique used in wastewater treatments. However, the issue of membrane fouling in UF can greatly hinder the effectiveness of the treatments. This study demonstrated a low-fouling composite cellulose membrane system based on microfibrillated cellulose (MFC) and silica nanoparticle additives. The incorporation of ‘non-spherical’ silica nanoparticles was found to exhibit better structural integration in the membrane (i.e., minimal aggregation of silica nanoparticles in the membrane scaffold) as compared to spherical silica. The resulting composite membranes were tested for UF using local wastewater, where the best-performing membrane exhibited higher permeation flux than commercial polyvinylidene difluoride (PVDF) and polyether sulfone (PES) membranes while maintaining a high separation efficiency (~99.6%) and good flux recovery ratio (>90%). The analysis of the fouling behavior using different models suggested that the processes of cake layer formation and pore-constriction were probably two dominant fouling mechanisms, likely due to the presence of humic substances in wastewater. The demonstrated cellulose composite membrane system showed low-fouling and high restoration capability by a simple hydraulic cleaning method due to the super hydrophilic nature of the cellulose scaffold containing silica nanoparticles.

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Razak, Norazizah Abd, and M. Niyaz Khan. "Kinetics and Mechanism of Nanoparticles-Catalyzed Piperidinolysis of Anionic Phenyl Salicylate." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/604139.

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The values of the relative counterion (X) binding constantRXBr(=KX/KBr, whereKXandKBrrepresent cetyltrimethylammonium bromide, CTABr, micellar binding constants ofXv-(in non-spherical micelles),v=1,2, and Br−(in spherical micelles)) are 58, 68, 127, and 125 forXv−=1−, 12−, 2−, and22-, respectively. The values of 15 mM CTABr/[NavX] nanoparticles-catalyzed apparent second-order rate constants for piperidinolysis of ionized phenyl salicylate at 35°C are 0.417, 0.488, 0.926, and 0.891 M−1 s−1forNavX= Na1, Na21, Na2, and Na22, respectively. Almost entire catalytic effect of nanoparticles catalyst is due to the ability of nonreactive counterions,Xv-, to expel reactive counterions,3−, from nanoparticles to the bulk water phase.

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Roacho-Pérez, Jorge A., Fernando G. Ruiz-Hernandez, Christian Chapa-Gonzalez, Herminia G. Martínez-Rodríguez, Israel A. Flores-Urquizo, Florencia E. Pedroza-Montoya, Elsa N. Garza-Treviño, Minerva Bautista-Villareal, Perla E. García-Casillas, and Celia N. Sánchez-Domínguez. "Magnetite Nanoparticles Coated with PEG 3350-Tween 80: In Vitro Characterization Using Primary Cell Cultures." Polymers 12, no. 2 (February 2, 2020): 300. http://dx.doi.org/10.3390/polym12020300.

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Some medical applications of magnetic nanoparticles require direct contact with healthy tissues and blood. If nanoparticles are not designed properly, they can cause several problems, such as cytotoxicity or hemolysis. A strategy for improvement the biological proprieties of magnetic nanoparticles is their functionalization with biocompatible polymers and nonionic surfactants. In this study we compared bare magnetite nanoparticles against magnetite nanoparticles coated with a combination of polyethylene glycol 3350 (PEG 3350) and polysorbate 80 (Tween 80). Physical characteristics of nanoparticles were evaluated. A primary culture of sheep adipose mesenchymal stem cells was developed to measure nanoparticle cytotoxicity. A sample of erythrocytes from a healthy donor was used for the hemolysis assay. Results showed the successful obtention of magnetite nanoparticles coated with PEG 3350-Tween 80, with a spherical shape, average size of 119.2 nm and a zeta potential of +5.61 mV. Interaction with mesenchymal stem cells showed a non-cytotoxic propriety at doses lower than 1000 µg/mL. Interaction with erythrocytes showed a non-hemolytic propriety at doses lower than 100 µg/mL. In vitro information obtained from this work concludes that the use of magnetite nanoparticles coated with PEG 3350-Tween 80 is safe for a biological system at low doses.

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Nickel, Rachel, Mohammad Reza Kazemian, Yaroslav Wroczynskyj, Song Liu, and Johan van Lierop. "Exploiting shape-selected iron oxide nanoparticles for the destruction of robust bacterial biofilms – active transport of biocides via surface charge and magnetic field control." Nanoscale 12, no. 7 (2020): 4328–33. http://dx.doi.org/10.1039/c9nr09484a.

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Kapate, Neha, John R. Clegg, and Samir Mitragotri. "Non-spherical micro- and nanoparticles for drug delivery: Progress over 15 years." Advanced Drug Delivery Reviews 177 (October 2021): 113807. http://dx.doi.org/10.1016/j.addr.2021.05.017.

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Jiang, Ziwen, Zhimin Zhou, and Yinmei Dai. "Synthesis of non-spherical pullulan nanoparticles across an in vitro placental model." Maturitas 124 (June 2019): 184. http://dx.doi.org/10.1016/j.maturitas.2019.04.190.

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Ojha, Abhijeet, Manish Thakker, Dinesh O. Shah, and Prachi Thareja. "Flow-directed assembly of non-spherical titania nanoparticles into superhydrophilic thin films." Frontiers of Materials Science 10, no. 1 (December 19, 2015): 1–7. http://dx.doi.org/10.1007/s11706-016-0321-4.

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Heilmann, A., M. Quinten, and J. Werner. "Optical response of thin plasma-polymer films with non-spherical silver nanoparticles." European Physical Journal B 3, no. 4 (July 1998): 455–61. http://dx.doi.org/10.1007/s100510050335.

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Mariychuk, Ruslan, Daniela Grulova, Liudmyla M. Grishchenko, Rostyslav P. Linnik, and Vladyslav V. Lisnyak. "Green synthesis of non-spherical gold nanoparticles using Solidago canadensis L. extract." Applied Nanoscience 10, no. 12 (April 30, 2020): 4817–26. http://dx.doi.org/10.1007/s13204-020-01406-x.

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Woo, Kyoungja, and Ho Jin Lee. "Preparation of Maghemite Nanoparticles for Clinical Applications." Key Engineering Materials 277-279 (January 2005): 876–80. http://dx.doi.org/10.4028/www.scientific.net/kem.277-279.876.

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The synthesis of nearly monodisperse, roughly spherical, and non-aggregated maghemite (g-Fe2O3) nanoparticles (average diameter = 5.5 nm, standard deviation = 0.7 nm over 100 particles) is reported. We utilized a sol-gel reaction of common ferric salt in reverse micelles and then, crystallization of the gel particles by reflux. The nanoparticles show superparamagnetic behavior and are expected to be useful for clinical applications.

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Karmaoui, Mohamed, David M. Tobaldi, Andrijana Sever Skapin Andrijana Sever Skapin, Robert C. Pullar, Maria P. Seabra, João A. Labrincha, and Vitor S. Amaral. "Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity." RSC Adv. 4, no. 87 (2014): 46762–70. http://dx.doi.org/10.1039/c4ra07214f.

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Swiech, Olga A., Lidia J. Opuchlik, Grzegorz Wojciuk, Tomasz M. Stepkowski, Marcin Kruszewski, and Renata Bilewicz. "Doxorubicin carriers based on Au nanoparticles – effect of shape and gold-drug linker on the carrier toxicity and therapeutic performance." RSC Advances 6, no. 38 (2016): 31960–67. http://dx.doi.org/10.1039/c6ra00177g.

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