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Journal articles on the topic 'Macroscopic assemblies'

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Author: Grafiati

Published: 11 March 2023

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1

Zhao, Sai, Lulu Li, Hao-Bin Zhang, Bingqing Qian, Jia-Qi Luo, Zhiming Deng, Shaowei Shi, Thomas P. Russell, and Zhong-Zhen Yu. "Janus MXene nanosheets for macroscopic assemblies." Materials Chemistry Frontiers 4, no. 3 (2020): 910–17. http://dx.doi.org/10.1039/c9qm00681h.

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Amphiphilic Janus MXene nanosheets are synthesized for the first time by a one-step transferring method, which can act as promising solid surfactants to stabilize emulsions, and assemble into macroscopic 2D ultrathin MXene films and 3D MXene aerogels.

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2

Liu, Jian-Wei, and Shu-Hong Yu. "Emergent motifs of macroscopic nanowire assemblies." National Science Review 2, no. 4 (April 20, 2015): 392–93. http://dx.doi.org/10.1093/nsr/nwv013.

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3

Cheng, Mengjiao, and Feng Shi. "Precise Macroscopic Supramolecular Assemblies: Strategies and Applications." Chemistry – A European Journal 26, no. 68 (September 28, 2020): 15763–78. http://dx.doi.org/10.1002/chem.202001881.

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4

Suiker, Akke S. J., and Norman A. Fleck. "Frictional Collapse of Granular Assemblies." Journal of Applied Mechanics 71, no. 3 (May 1, 2004): 350–58. http://dx.doi.org/10.1115/1.1753266.

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The frictional collapse of an assembly of equisized spheres is studied by a discrete element model. The macroscopic constitutive response is determined as a function of the level of Coulomb friction between particles. It is found that the level of Coulomb friction has a strong effect upon the relative proportion of sliding and rolling between particles, and consequently upon the macroscopic strength of the granular assembly. The discrete element predictions are shown to be in good agreement with experimental results obtained from triaxial tests on an aggregate of steel spheres. It is demonstrated that the shape of the collapse surface can be adequately represented by the Lade-Duncan continuum model.

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5

Gao, Chang, Kaiyue Chen, Ying Wang, Yang Zhao, and Liangti Qu. "2D Graphene‐Based Macroscopic Assemblies for Micro‐Supercapacitors." ChemSusChem 13, no. 6 (March 2, 2020): 1255–74. http://dx.doi.org/10.1002/cssc.201902707.

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6

Suk, Pavel. "ADVANCED HOMOGENIZATION METHODS FOR PRESSURIZED WATER REACTORS." Acta Polytechnica CTU Proceedings 19 (December 14, 2018): 14. http://dx.doi.org/10.14311/app.2018.19.0014.

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Macroscopic cross section generation is key part of core calculation. Commonly, the data are prepared independently without a knowledge of fuel loading pattern. The fuel assemblies are simulated in infinite lattice (with mirror boundary conditions). Rehomogenization method is based on combination of actual neutron flux in fuel assembly with macroscopic data from infinite lattice. Rehomogenization method was implemented into the macrocode Andrea and tested on a reference cases. Cases consist of fuel cases, cases with strong absorber, cases with absorption rods, or cases with reflector assemblies. Testing method is based on a comparisons of homogenized and rehomogenized macroscopic cross sections and later on a comparisons of relative power of each fuel assembly. Above that there is comparison of eigenvalue.

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7

Large, Matthew J., Sean P. Ogilvie, Manuela Meloni, Aline Amorim Graf, Giuseppe Fratta, Jonathan Salvage, Alice A. K. King, and Alan B. Dalton. "Functional liquid structures by emulsification of graphene and other two-dimensional nanomaterials." Nanoscale 10, no. 4 (2018): 1582–86. http://dx.doi.org/10.1039/c7nr05568d.

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8

Wang, Shijun, Jiahao Lin, Zhen Xu, and Zhiping Xu. "Understanding macroscopic assemblies of carbon nanostructures with microstructural complexity." Composites Part A: Applied Science and Manufacturing 143 (April 2021): 106318. http://dx.doi.org/10.1016/j.compositesa.2021.106318.

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9

Durov, Vladimir A. "Supramolecular assemblies in liquids: structure, thermodynamics, and macroscopic properties." Journal of Molecular Liquids 118, no. 1-3 (April 2005): 101–10. http://dx.doi.org/10.1016/j.molliq.2004.07.022.

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10

Zhang, Wendi. "Functional graphene film macroscopic assemblies for flexible supercapacitor application." Journal of Physics: Conference Series 1168 (February 2019): 022071. http://dx.doi.org/10.1088/1742-6596/1168/2/022071.

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11

Liu, Y., C. Liang, A. Wei, Y. Jiang, Q. Tian, Y. Wu, Z. Xu, et al. "Solder-free electrical Joule welding of macroscopic graphene assemblies." Materials Today Nano 3 (August 2018): 1–8. http://dx.doi.org/10.1016/j.mtnano.2018.09.005.

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12

Coleman, Anthony W., Said Jebors, Patrick Shahgaldian, Gennady S. Ananchenko, and John A. Ripmeester. "para-Acylcalix[n]arenes: from molecular to macroscopic assemblies." Chemical Communications, no. 20 (2008): 2291. http://dx.doi.org/10.1039/b717495k.

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13

Liu, Luqi, Wenjun Ma, and Zhong Zhang. "Macroscopic Carbon Nanotube Assemblies: Preparation, Properties, and Potential Applications." Small 7, no. 11 (April 20, 2011): 1504–20. http://dx.doi.org/10.1002/smll.201002198.

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14

Eggert, J., and J. L. van Hemmen. "Modeling Neuronal Assemblies: Theory and Implementation." Neural Computation 13, no. 9 (September 1, 2001): 1923–74. http://dx.doi.org/10.1162/089976601750399254.

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Models that describe qualitatively and quantitatively the activity of entire groups of spiking neurons are becoming increasingly important for biologically realistic large-scale network simulations. At the systems and areas modeling level, it is necessary to switch the basic descriptional level from single spiking neurons to neuronal assemblies. In this article, we present and review work that allows a macroscopic description of the assembly activity. We show that such macroscopic models can be used to reproduce in a quantitatively exact manner the joint activity of groups of spike-response or integrate-and-fire neurons. We also show that integral as well as differential equation models of neuronal assemblies can be understood within a single framework, which allows a comparison with the commonly used assembly-averaged graded-response type of models. The presented framework thus enables the large-scale neural network modeler to implement networks using computational units beyond the single spiking neuron without losing much biological accuracy. This article explains the theoretical background as well as the capabilities and the implementation details of the assembly approach.

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15

Kodanek, Torben, Axel Freytag, Anja Schlosser, Suraj Naskar, Thomas Härtling, Dirk Dorfs, and Nadja Carola Bigall. "Macroscopic Aerogels with Retained Nanoscopic Plasmonic Properties." Zeitschrift für Physikalische Chemie 232, no. 9-11 (August 28, 2018): 1675–89. http://dx.doi.org/10.1515/zpch-2017-1045.

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Abstract Aerogels can bridge the nanoscopic to the macroscopic world. One physical phenomenon typically limited to the nanoscopic world is the occurrence of localized surface plasmon resonances (LSPRs), which are observed in conductive nanoparticles. Once brought into close contact, assemblies or superstructures of these nanoparticles often lose their plasmonic properties in the transition stage towards the bulk material. Therefore, LSPRs are typically not observed in macroscopic objects. The present work aims at voluminous nanoparticle-based aerogels with optical properties close to that of the initial colloidal solution and the possibility to manipulate the final plasmonic properties by bringing the particles into defined distances. In detail, Ag nanocrystals with silica shells ranging from 0 to 12 nm are employed as building blocks, which are assembled from their solution into macroscopic three-dimensional superstructures by freezing and subsequent lyophilization. These cryogelated aerogels are synthesized as monoliths and thin films in which the Ag nanocrystals are arranged in defined distances according to their silica shell. The resulting aerogels exhibit plasmonic properties ranging from a behavior similar to that of the building blocks for the thickest shell to a heavily distorted behavior for bare Ag nanocrystals.

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16

Zhang, Y. N., G. Z. Sun, and L. X. Zheng. "Fabrication and Properties of Macroscopic Carbon Nanotube Assemblies Transforming from Aligned Nanotubes." Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/907954.

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Macroscale assemblies of well-aligned carbon nanotubes (CNTs) can inherit intrinsic properties from individual CNTs and at the same time ease handling difficulties that occur at nanometer scale when dealing with individual CNTs. Herein, simple fabrication processes are introduced to produce a variety of macroscale CNT assemblies, including well-aligned CNT bundles, CNT films, and CNT fibers, from the same starting material: spinnable CNT arrays. The electrical and mechanical properties of the as-prepared CNT assemblies have been investigated and compared. It is found that CNT films show an electrical conductivity of 145~250 S cm−1which is comparable to CNT fibers, but two orders magnitude higher than that of conventional Bucky paper. CNT fibers exhibit diameter dependent tensile strength which is mainly attributed to the nonuniform twisting along the radial direction of fibers.

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17

Simonson, Andrew W., Matthew R. Aronson, and Scott H. Medina. "Supramolecular Peptide Assemblies as Antimicrobial Scaffolds." Molecules 25, no. 12 (June 14, 2020): 2751. http://dx.doi.org/10.3390/molecules25122751.

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Antimicrobial discovery in the age of antibiotic resistance has demanded the prioritization of non-conventional therapies that act on new targets or employ novel mechanisms. Among these, supramolecular antimicrobial peptide assemblies have emerged as attractive therapeutic platforms, operating as both the bactericidal agent and delivery vector for combinatorial antibiotics. Leveraging their programmable inter- and intra-molecular interactions, peptides can be engineered to form higher ordered monolithic or co-assembled structures, including nano-fibers, -nets, and -tubes, where their unique bifunctionalities often emerge from the supramolecular state. Further advancements have included the formation of macroscopic hydrogels that act as bioresponsive, bactericidal materials. This systematic review covers recent advances in the development of supramolecular antimicrobial peptide technologies and discusses their potential impact on future drug discovery efforts.

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18

Horkay, Ferenc, Peter J. Basser, Anne-Marie Hecht, and Erik Geissler. "Cartilage: Multiscale Structure and Biomechanical Properties." MRS Advances 1, no. 8 (2016): 509–19. http://dx.doi.org/10.1557/adv.2016.184.

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ABSTRACTCartilage is a load bearing tissue that has multiple biological functions. The major proteoglycan in cartilage is the bottlebrush shaped aggrecan whose complexes with hyaluronic acid provide the compressive resistance of cartilage. The negatively charged aggrecan-hyaluronic acid complexes generate an osmotic swelling pressure within the tissue, which is balanced by the collagen network. To better understand the function of cartilage at the tissue level, we study aggrecan assemblies using an array of microscopic and macroscopic techniques. The organization of aggrecan assemblies at the supramolecular level is probed by light scattering, small-angle neutron scattering and small-angle X-ray scattering. Osmotic and rheological measurements are used to investigate the macroscopic physical properties.

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19

Cong, Huai-Ping, Jia-Fu Chen, and Shu-Hong Yu. "Graphene-based macroscopic assemblies and architectures: an emerging material system." Chem. Soc. Rev. 43, no. 21 (July 28, 2014): 7295–325. http://dx.doi.org/10.1039/c4cs00181h.

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20

Chen, Shaoyu, Franco King-Chi Leung, Marc C. A. Stuart, Chaoxia Wang, and Ben L. Feringa. "Dynamic Assemblies of Molecular Motor Amphiphiles Control Macroscopic Foam Properties." Journal of the American Chemical Society 142, no. 22 (May 7, 2020): 10163–72. http://dx.doi.org/10.1021/jacs.0c03153.

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21

Nicot, François, Luc Sibille, Frédéric Donze, and Félix Darve. "From microscopic to macroscopic second-order work in granular assemblies." Mechanics of Materials 39, no. 7 (July 2007): 664–84. http://dx.doi.org/10.1016/j.mechmat.2006.10.003.

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22

Kim, Keun Su, Michael B. Jakubinek, Yadienka Martinez-Rubi, Behnam Ashrafi, Jingwen Guan, K. O'Neill, Mark Plunkett, et al. "Polymer nanocomposites from free-standing, macroscopic boron nitride nanotube assemblies." RSC Advances 5, no. 51 (2015): 41186–92. http://dx.doi.org/10.1039/c5ra02988k.

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23

Tebbe, Moritz, Martin Mayer, Bernhard A. Glatz, Christoph Hanske, Patrick T. Probst, Mareen B. Müller, Matthias Karg, et al. "Optically anisotropic substrates via wrinkle-assisted convective assembly of gold nanorods on macroscopic areas." Faraday Discussions 181 (2015): 243–60. http://dx.doi.org/10.1039/c4fd00236a.

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We demonstrate the large-scale organisation of anisotropic nanoparticles into linear assemblies displaying optical anisotropy on macroscopic areas. Monodisperse gold nanorods with a hydrophilic protein shell are arranged by dip-coating on wrinkled surfaces and subsequently transferred to indium tin oxide (ITO) substrates by capillary transfer printing. We elucidate how tuning the wrinkle amplitude enables us to precisely adjust the assembly morphology and fabricate single, double and triple nanorod lines. For the single lines, we quantify the order parameter of the assemblies as well as interparticle distances from scanning electron microscopy (SEM) images. We find an order parameter of 0.97 and a mean interparticle gap size of 7 nm. This combination of close to perfect uni-axial alignment and close-packing gives rise to pronounced macroscopic anisotropic optical properties due to strong plasmonic coupling. We characterise the optical response of the assemblies on ITO-coated glass via UV/vis/NIR spectroscopy and determine an optical order parameter of 0.91. The assemblies are thus plasmonic metamaterials, as their periodicity and building block sizes are well below the optical wavelength. The presented approach does not rely on lithographic patterning and provides access to functional materials, which could have applications in subwavelength waveguiding, photovoltaics, and for large-area metamaterial fabrication.

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24

Haddad, Asaf, Hillel Aharoni, Eran Sharon, Alexander G. Shtukenberg, Bart Kahr, and Efi Efrati. "Twist renormalization in molecular crystals driven by geometric frustration." Soft Matter 15, no. 1 (2019): 116–26. http://dx.doi.org/10.1039/c8sm01290c.

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Geometric frustration provides a path for conveying twist across length scales and for producing size dependent twist in macroscopic assemblies, thus shining a light on the formation of twisted molecular crystals.

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25

Hasobe, Taku, and Hayato Sakai. "Molecular nanoarchitectures composed of porphyrins and carbon nanomaterials for light energy conversion." Journal of Porphyrins and Phthalocyanines 15, no. 05n06 (May 2011): 301–11. http://dx.doi.org/10.1142/s1088424611003318.

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In this review, we report the recent advances in the construction of composite molecular nanoarchitectures of porphyrins and nanoscale carbon materials such carbon nanotubes (CNT), graphenes and polycyclic aromatic hydrocarbons (PAH) for photoinduced electron transfer and light energy conversion. First, we state novel single-wall carbon nanotubes (SWCNT)-driven aggregation of protonated porphyrins to produce supramolecular assemblies in the form of macroscopic bundles. Then, photoinduced electron transfer in self-assembled single-walled carbon nanotube (SWCNT)/zinc porphyrin (ZnP) hybrids utilizing (7,6)- and (6,5)-enriched SWCNTs having different band gaps is reported. Further, we discuss the structural and photoelectrochemical properties of porphyrin-based molecular assemblies of other carbon materials such as stacked-cup carbon nanotubes (SCCNT), carbon nanohorns (CNH) and graphenes. Finally, novel supramolecular patterning formation composed of triphenylene core-centered porphyrin hexamers for electronics is discussed.

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26

Ma, Haoxiang, Changzheng Li, Yang Yang, and Zhimin Fan. "3D Porous MXene Films for Advanced Electromagnetic Interference Shielding and Capacitive Storage." Crystals 12, no. 6 (May 27, 2022): 780. http://dx.doi.org/10.3390/cryst12060780.

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The construction of abundant pore channels between the layers of Ti3C2Tx MXene film is an important approach to fully exploit the 2D macromolecular properties of MXene (Ti3C2Tx), which is of great significance for further realizing the practical application of MXene macroscopic assemblies in the field of electromagnetic interference shielding and capacitive storage. However, there is still a lack of systematic introductions and prospects of this field, thus far. In this review, starting from the preparation of MXene macroscopic assemblies, the 3D porous MXene films, constructed by sacrificial templating, vapor foaming, and light foaming, as well as their corresponding properties of electromagnetic interference shielding and capacitive storage, are introduced. In addition, the current bottlenecks and great challenges of 3D porous MXene films are deeply analyzed, and effective solutions for future application development trends are proposed.

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27

Shen, Jiacong, Junqi Sun, and Xi Zhang. "Polymeric nanostructured composite films." Pure and Applied Chemistry 72, no. 1-2 (January 1, 2000): 147–55. http://dx.doi.org/10.1351/pac200072010147.

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This research news describes the construction of polymeric nanostructured composite film based on a variety of interactions, such as hydrophobic–hydrophilic effect, electrostatic interaction, hydrogen bonding, etc. The work focused on developing strategies to solve the basic problems in the area of ultrathin film research, such as stability, improving the interface quality, creating patterned interface, and techniques to construct nanolayered structure. With in-depth study of the relationship between the microscopic layered architecture and macroscopic function of supramolecular assemblies, it is anticipated that one could obtain miniature devices or machines of high efficiency through integration of the assembling process and device fabrication.

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Mentovich, Elad D., Konstantin Livanov, Deepak K. Prusty, Mukules Sowwan, and Shachar Richter. "DNA-nanoparticle assemblies go organic: Macroscopic polymeric materials with nanosized features." Journal of Nanobiotechnology 10, no. 1 (2012): 21. http://dx.doi.org/10.1186/1477-3155-10-21.

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29

Pazos-Perez, Nicolas, and Ramon Alvarez-Puebla. "Plasmonic Macroscopic Structures: from linear assemblies to 3D structured super-crystals." Journal of Physics: Conference Series 1092 (September 2018): 012113. http://dx.doi.org/10.1088/1742-6596/1092/1/012113.

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30

Kageyama, Yoshiyuki, Naruho Tanigake, Yuta Kurokome, Sachiko Iwaki, Sadamu Takeda, Kentaro Suzuki, and Tadashi Sugawara. "Macroscopic motion of supramolecular assemblies actuated by photoisomerization of azobenzene derivatives." Chemical Communications 49, no. 82 (2013): 9386. http://dx.doi.org/10.1039/c3cc43488e.

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31

Launois, P., and V. Pichot. "Macroscopic assemblies of aligned nanotubes studied by X-ray diffraction and microdiffraction." Acta Crystallographica Section A Foundations of Crystallography 62, a1 (August 6, 2006): s100. http://dx.doi.org/10.1107/s010876730609800x.

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32

Wilbs, Genevieve, Michael Smik, Ulrich Rücker, Oleg Petracic, and Thomas Brückel. "Macroscopic nanoparticle assemblies: exploring the structural and magnetic properties of large supercrystals." Materials Today: Proceedings 4 (2017): S146—S153. http://dx.doi.org/10.1016/j.matpr.2017.09.179.

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33

Devaux, André, and Gion Calzaferri. "Manipulation of Energy Transfer Processes in Nanochannels." International Journal of Photoenergy 2009 (2009): 1–9. http://dx.doi.org/10.1155/2009/741834.

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The realisation of molecular assemblies featuring specific macroscopic properties is a prime example for the versatility of supramolecular organisation. Microporous materials such as zeolite L are well suited for the preparation of host-guest composites containing dyes, complexes, or clusters. This short tutorial focuses on the possibilities offered by zeolite L to study and influence Förster resonance energy transfer inside of its nanochannels. The highly organised host-guest materials can in turn be structured on a larger scale to form macroscopic patterns, making it possible to create large-scale structures from small, highly organised building blocks for novel optical applications.

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34

Vella, Dominic, Emmanuel du Pontavice, Cameron L. Hall, and Alain Goriely. "The magneto-elastica : from self-buckling to self-assembly." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2162 (February 8, 2014): 20130609. http://dx.doi.org/10.1098/rspa.2013.0609.

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Spherical neodymium–iron–boron magnets are permanent magnets that can be assembled into a variety of structures owing to their high magnetic strength. A one-dimensional chain of these magnets responds to mechanical loadings in a manner reminiscent of an elastic rod. We investigate the macroscopic mechanical properties of assemblies of ferromagnetic spheres by considering chains, rings and chiral cylinders of magnets. Based on energy estimates and simple experiments, we introduce an effective magnetic bending stiffness for a chain of magnets and show that, used in conjunction with classic results for elastic rods, it provides excellent estimates for the buckling and vibration dynamics of magnetic chains. We then use this estimate to understand the dynamic self-assembly of a cylinder from an initially straight chain of magnets.

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35

Ren, Xiaofeng, and Chong Wang. "Stationary disk assemblies in a ternary system with long range interaction." Communications in Contemporary Mathematics 21, no. 06 (August 27, 2019): 1850046. http://dx.doi.org/10.1142/s0219199718500463.

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The free energy of a ternary system, such as a triblock copolymer, is a sum of two parts: an interface energy determined by the size of the interfaces separating the micro-domains of the three constituents, and a long range interaction energy that serves to prevent unlimited micro-domain growth. In two dimensions a parameter range is identified where the system admits stable stationary disk assemblies. Such an assembly consists of perturbed disks made from either type-I constituent or type-II constituent. All the type-I disks have approximately the same radius and all the type-II disks also have approximately the same radius. The locations of the disks are determined by minimization of a function. Depending on the parameters, the disks of the two types can be mixed in an organized way, or mixed in a random way. They can also be fully separated. The first scenario offers a mathematical proof of the existence of a morphological phase for triblock copolymers conjectured by polymer scientists. The last scenario shows that the ternary system is capable of producing two levels of structure. The primary structure is at the microscopic level where disks form near-perfect lattices. The secondary structure is at the macroscopic level forming two large regions, one filled with type-I disks and the other filled with type-II disks. A macroscopic, circular interface separates the two regions.

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36

Liang, Hai-Wei, Jian-Wei Liu, Hai-Sheng Qian, and Shu-Hong Yu. "Multiplex Templating Process in One-Dimensional Nanoscale: Controllable Synthesis, Macroscopic Assemblies, and Applications." Accounts of Chemical Research 46, no. 7 (February 26, 2013): 1450–61. http://dx.doi.org/10.1021/ar300272m.

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Le, Phuong Thi Anh, Tuyen Phi Vu, Hoa Thi Le, Do Van Phan, Ca Xuan Nguyen, Thanh Duy Luong, Nhan Thi Thanh Dang, and Thanh Dinh Nguyen. "Nacre-Mimicking Titania/Graphene/Chitin Assemblies in Macroscopic Layered Membranes and Their Performance." Journal of Electronic Materials 49, no. 6 (March 30, 2020): 3791–803. http://dx.doi.org/10.1007/s11664-020-08062-5.

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38

Jun, Young-Si, Jihee Park, Sun Uk Lee, Arne Thomas, Won Hi Hong, and Galen D. Stucky. "Three-Dimensional Macroscopic Assemblies of Low-Dimensional Carbon Nitrides for Enhanced Hydrogen Evolution." Angewandte Chemie International Edition 52, no. 42 (September 13, 2013): 11083–87. http://dx.doi.org/10.1002/anie.201304034.

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Jun, Young-Si, Jihee Park, Sun Uk Lee, Arne Thomas, Won Hi Hong, and Galen D. Stucky. "Three-Dimensional Macroscopic Assemblies of Low-Dimensional Carbon Nitrides for Enhanced Hydrogen Evolution." Angewandte Chemie 125, no. 42 (September 13, 2013): 11289–93. http://dx.doi.org/10.1002/ange.201304034.

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40

Chang, Dan, Jingran Liu, Bo Fang, Zhen Xu, Zheng Li, Yilun Liu, Laurence Brassart, Fan Guo, Weiwei Gao, and Chao Gao. "Reversible fusion and fission of graphene oxide–based fibers." Science 372, no. 6542 (May 6, 2021): 614–17. http://dx.doi.org/10.1126/science.abb6640.

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Stimuli-responsive fusion and fission are widely observed in both bio-organizations and artificial molecular assemblies. However, the design of a system with structure and property persistence during repeated fusion and fission remains challenging. We show reversible fusion and fission of wet-spun graphene oxide (GO) fibers, in which a number of macroscopic fibers can fuse into a thicker one and can also separate into original individual fibers under stimulation of solvents. The dynamic geometrical deformation of GO fiber shells, caused by solvent evaporation and infiltration, is the key to the reversible fusion-fission cycles. This principle is extended to implement flexible transitions between complex fiber assemblies and the inclusion or expulsion of guest compounds.

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41

Mayer, Martin, Moritz Tebbe, Christian Kuttner, Max J. Schnepf, Tobias A. F. König, and Andreas Fery. "Template-assisted colloidal self-assembly of macroscopic magnetic metasurfaces." Faraday Discussions 191 (2016): 159–76. http://dx.doi.org/10.1039/c6fd00013d.

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We demonstrate a template-assisted colloidal self-assembly approach for magnetic metasurfaces on macroscopic areas. The choice of anisotropic colloidal particle geometry, assembly pattern and metallic film is based on rational design criteria, taking advantage of mirror-charge effects for gold nanorods placed on gold film. Monodisperse gold nanorods prepared utilizing wet-chemistry are arranged with high precision on wrinkled templates to form linear array-type assemblies and subsequently transferred to a thin gold film. Due to the obtained particle-to-film distance of 1.1 nm, the plasmonic mode of the nanorod is able to couple efficiently with the supporting metallic film, giving rise to a magnetic mode in the visible spectrum (721 nm). Conventional UV-vis-NIR measurements in close correlation with electromagnetic simulations provide evidence for the presence of a magnetic resonance on the macroscopic area. The herein presented scalable lithography-free fabrication process paves the road towards colloidal functional metasurfaces with an optical response in the effective magnetic permeability.

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42

Peng, D. L., K. Sumiyama, T. Hihara, and S. Yamamuro. "Enhancement of magnetic coercivity and macroscopic quantum tunneling in monodispersed Co/CoO cluster assemblies." Applied Physics Letters 75, no. 24 (December 13, 1999): 3856–58. http://dx.doi.org/10.1063/1.125479.

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43

Galindo-Torres, Sergio Andres, Dorival Pedroso, David Williams, and Hans Mühlhaus. "An Analysis of the Strength of Anisotropic Granular Assemblies via Discrete Methods." Applied Mechanics and Materials 553 (May 2014): 525–30. http://dx.doi.org/10.4028/www.scientific.net/amm.553.525.

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This paper presents a study on the macroscopic strength characteristics of granular assemblies with three-dimensional complex-shaped particles. Different assemblies are considered, with both isotropic and anisotropic particle geometries. The study is conducted using the Discrete Element Method (DEM), with so-called sphero-polyhedral particles, and simulations of mechanical true triaxial tests for a range of Lode angles and confining pressures. The observed mathematical failure envelopes are investigated in the Haigh-Westergaard stress space, as well as on the deviatoric-mean pressure plane. It is verified that the DEM with non-spherical particles produces results that are qualitatively similar to experimental data and previous numerical results obtained with spherical elements. The simulations reproduce quite well the shear strength of assemblies of granular media, such as higher strength during compression than during extension. In contrast, by introducing anisotropy at the particle level, the shear strength parameters are greatly affected, and an isotropic failure criterion is no longer valid. It is observed that the strength of the anisotropic assembly depends on the direction of loading, as observed for real soils.

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Okiy, Karinate Valentine. "Effect of Interparticle Friction on the Micromechanical Strength Characteristics of Three Dimensional Granular Media." International Journal of Engineering Research in Africa 16 (June 2015): 79–89. http://dx.doi.org/10.4028/www.scientific.net/jera.16.79.

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The role of interparticle friction on the micromechanical strength characteristics of granular assembly subjected to gradual shearing was analyzed. Three dimensional discrete element method (DEM) was applied in the simulation of quasi-static shearing of granular assemblies with varying interparticle frictional coefficients [µ= 0.10, 0.25, 0.50]. From the reported simulation results, analysis of the following was performed for varying interparticle frictional capacities.i. The normal and tangential stress contributions of weak and strong contacts to principal stress components.ii. Contribution of strong and weak contacts to principal and deviator stress.iii. Evolution of mechanical coordination number and fabric anisotropy of strong contact forces.From this analysis, it is safe to conclude that interparticle friction has a direct effect on the major and minor principal stress components in sheared granular assemblies. Consequently, increasing interparticle friction capacity enhances macroscopic shear strength in sheared granular assemblies. Likewise, at the peak shear strength of the sheared granular media, there exists a maximum fabric anisotropy of strong contact forces and this corresponds to a minimum value of mechanical coordination number (minimum possible number of load bearing contacts per particle).

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Verma, V., D. Chionis, A. Dokhane, and H. Ferroukhi. "MODELLING AND ANALYSIS OF FUEL ASSEMBLY VIBRATIONAL MODES IN PWRS USING SIMULATE-3K." EPJ Web of Conferences 247 (2021): 21008. http://dx.doi.org/10.1051/epjconf/202124721008.

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Some of the KWU pre-KONVOI PWRs operating across Europe saw a systematic increase in the neutron noise levels over several cycles in the last decade, and subsequently, core internals’ movements, especially vibrations of fuel assemblies with specific designs were identified as one of the plausible causes. Therefore, it is important to develop computational methods that can allow to investigate and predict the reactor noise response to fuel assemblies vibrations. To this aim, the 3D nodal reactor dynamics code SIMULATE-3K is used at PSI with a special module called the ‘assembly vibration model’ that imitates time-dependent motions of fuel assemblies by dynamically modifying the water-gaps surrounding the laterally moving fuel assemblies. The varying water-gaps are represented by the variation in the corresponding two-group macroscopic cross sections generated using the lattice code CASMO-5 in 2D. The studies conducted so far to assess the methodology for full core noise simulations were based on assuming vibrations of a clamped-free cluster of fuel assemblies that are unsupported from both ends. However, as this represents a non-physical movement, further developments were made at PSI to allow simulating more realistic movements of fuel assemblies such as the cantilevered mode vibration. The updated methodology, along with evaluations of the simulated noise response to realistic vibration modes, is presented in this paper. Results show that, as expected, the radial and axial neutron noise behaviour follow the vibration pattern of the imposed time-dependent axial functions corresponding to the natural oscillation modes of the fuel assemblies, thereby providing confidence in the application of the developed methodology for numerical neutron noise analyses of the PWR cores.

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Michalski, Jacek, and Jacek Domański. "Macroscopic model for honing motor cylinders exhaust as a tool optimizing height smooth gasket in repair technology." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (June 30, 2018): 600–608. http://dx.doi.org/10.24136/atest.2018.142.

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The paper presents the assumptions of the macroscopic mathematical model of honing, taking into account both the kinematics of the tool and the characteristic for this process the distribution of unit pressures occurring in the interaction of sharpening stones on the surface of the honing stones on the surface of the workpiece are characteristic for this process. On the basis of these assemblies an active and tested computer program has been developed, which numerically model this technological process. In the computer memory are created digital quality maps of the surface of the machined cylinder. On the basis of the described assemblies, a working and tested computer program has been developed that numerically models this technological process. Digital quality maps are created in the computer's memory regarding the surface of both the cylinder and the smoothing stones. These maps can be assessed analytically as well as subjected to visualization. The article presents the results of calculations that optimize the height of smooth ground for the process of honing a specific cylinder liner with the analysis of the results ob-tained. The described computer program saves time and funds during dedicated research that optimizes the pa-rameters of this process

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Gea Pagano, Arianna, Vanessa Magnanimo, and Alessandro Tarantino. "A DEM investigation of the shearing behaviour of non-active clays." E3S Web of Conferences 92 (2019): 14003. http://dx.doi.org/10.1051/e3sconf/20199214003.

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This paper presents the numerical DEM simulation of shear tests on two-dimensional clay-like specimens. Clay particles are modelled as rod-shaped elements made of spherical elementary units. The contact laws implemented in the adopted DEM framework account for both the mechanical interaction developing between particles in contact, and the long-range electro-chemical interaction in the form of Coulombian attraction/repulsion between charged particles. Virtual specimens for shear testing are obtained via the one-dimensional compression and unloading of clay-like particle assemblies, in order to study the effect of different over consolidation ratios on the macroscopic mechanical behaviour. The DEM framework is challenged against its ability to reproduce qualitatively key aspects of the macroscopic behaviour of normally consolidated and over consolidated clays during shearing, including contractive and dilative behaviour, and monotonic and non-monotonic stress-strain behaviour.

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FREEMAN, WALTER J., ROBERTO LIVI, MASASHI OBINATA, and GIUSEPPE VITIELLO. "CORTICAL PHASE TRANSITIONS, NONEQUILIBRIUM THERMODYNAMICS AND THE TIME-DEPENDENT GINZBURG–LANDAU EQUATION." International Journal of Modern Physics B 26, no. 06 (March 10, 2012): 1250035. http://dx.doi.org/10.1142/s021797921250035x.

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The formation of amplitude modulated and phase modulated assemblies of neurons is observed in the brain functional activity. The study of the formation of such structures requires that the analysis has to be organized in hierarchical levels, microscopic, mesoscopic, macroscopic, each with its characteristic space-time scales and the various forms of energy, electric, chemical, thermal produced and used by the brain. In this paper, we discuss the microscopic dynamics underlying the mesoscopic and the macroscopic levels and focus our attention on the thermodynamics of the nonequilibrium phase transitions. We obtain the time-dependent Ginzburg–Landau equation for the nonstationary regime and consider the formation of topologically nontrivial structures such as the vortex solution. The power laws observed in functional activities of the brain is also discussed and related to coherent states characterizing the many-body dissipative model of brain.

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Pearce, Garth M., Shen Hin Lim, Jung Hoon Sul, B. Gangadhara Prusty, and Don W. Kelly. "Atoms to Assemblies: A Physics-Based Hierarchical Modelling Approach for Polymer Composite Components." Applied Mechanics and Materials 553 (May 2014): 41–47. http://dx.doi.org/10.4028/www.scientific.net/amm.553.41.

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The development of new composite materials requires analysis and experimentation spanning scales from nanometres to metres, from “atoms to assemblies”. In this paper, concerned primarily with fibre reinforced epoxy composites, a methodology is presented which allows continuum level structural simulation to account for nanoand micro-scale size effects in composites. The novelty of this approach is the modular hierarchical nature of the simulation which ensures computational tractability, regardless of the length scales considered. Linking the nanoscale to the macroscopic scale in a single simulation allows for holistic materials development, including the addition of nanoadditives to polymer resin systems.

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Fameau, Anne-Laure, and Arnaud Saint-Jalmes. "Yielding and flow of solutions of thermoresponsive surfactant tubes: tuning macroscopic rheology by supramolecular assemblies." Soft Matter 10, no. 20 (2014): 3622. http://dx.doi.org/10.1039/c3sm53001a.

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