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1. Particle Physics of the Dark Sector

   https://doi.org/10.3390/sym14112238  

   Baker, Oliver; Afanasev, Andrei; Lagouri, Theodota; Pan, Jingjing; Weber, Christian (November 2022, Symmetry)

   The mystery associated with a proposed Dark Sector of phenomena that are separate from the standard model of particle physics is described. A Dark Sector may possess matter particles, force carriers which mediate their interactions, and new interactions and symmetries that are beyond the standard model of particle physics. Various approaches for Dark Sector searches are described, including those at the energy frontier at the Large Hadron Collider, in astrophysical interactions with both terrestrial experiments and those in space-born platforms. Searches using low energy photons from microwave energies in cryogenic environments to x-ray energies are also described. While there is no noncontroversial evidence for Dark Sector phenomena presently, new searches with more modern equipment and analysis methods are exploring regions of phase space that have not been available before now, indicating ongoing interest and excitement in this research. 

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2. Particle Size and Rheology of Silica Particle Networks at the Air–Water Interface

   https://doi.org/10.3390/nano13142114  

   Thakur, Siddharth; Razavi, Sepideh (July 2023, Nanomaterials)

   Silica nanoparticles find utility in different roles within the commercial domain. They are either employed in bulk within pharmaceutical formulations or at interfaces in anti-coalescing agents. Thus, studying the particle attributes contributing to the characteristics of silica particle-laden interfaces is of interest. The present work highlights the impact of particle size (i.e., 250 nm vs. 1000 nm) on the rheological properties of interfacial networks formed by hydrophobically modified silica nanoparticles at the air–water interface. The particle surface properties were examined using mobility measurements, Langmuir trough studies, and interfacial rheology techniques. Optical microscopy imaging along with Langmuir trough studies revealed the microstructure associated with various surface pressures and corresponding surface coverages (ϕ). The 1000 nm silica particle networks gave rise to a higher surface pressure at the same coverage compared to 250 nm particles on account of the stronger attractive capillary interactions. Interfacial rheological characterization revealed that networks with 1000 nm particles possess higher surface modulus and yield stress in comparison to the network obtained with 250 nm particles at the same surface pressure. These findings highlight the effect of particle size on the rheological characteristics of particle-laden interfaces, which is of importance in determining the stability and flow response of formulations comprising particle-stabilized emulsions and foams. 

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3. The smallest particle collider

   https://doi.org/10.1126/science.abb3552  

   Feldman, D. E. (April 2020, Science)
4. The Study of Particle-Particle Interaction and Assembly under the Influence of Dielectrophoretic Force Experienced between Carbon Microelectrodes

   https://doi.org/10.3850/978-981-11-2728-1_52  

   Cheng, Chih-I; Cortez, Jennifer; Dorantes, Iridian Brenely; Rodriguez, Edgar Andres; Zad, Sina Habibi; Kulinsky, Lawrence (October 2018, Proceedings of the World Congress on Micro and Nano Manufacturing 2018)

   Electrokinetic microassembly is used to position microparts via dielectrophoresis and electro-osmosis. Present work studies experimental conditions for creating latex particle agglomerates such as “pearly chains”. The work discusses one of the approaches to lock particles in the position after the electric field is removed. Particle-to-particle interactions such as electro-rotation and formation of particle chains parallel and perpendicular to the field lines are explored. 

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5. Effects of the VACES particle concentrator on secondary organic aerosol and ambient particle composition

   https://doi.org/10.1080/02786826.2022.2081065  

   Wingen, L. M.; Herman, D. A.; Keebaugh, A.; Montoya, G.; Renusch, S. R.; Finlayson-Pitts, B. J.; Kleinman, M. T. (April 2022, Aerosol science and technology)