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Apr 2020 • Clinical and Translational Biophotonics, TW4B. 5, 2020

Monitoring of vital bio-signs by multimode speckle based optical fiber sensor

Aviya Bennett, Yevgeny Beiderman, Sergey Agdarov, Yafim Beiderman, Rotem Hendel, Barak Straussman, Zeev Zalevsky

We present development and experimental validation of the multimode fiber sensor for monitoring of vital bio signs. The goal is to advance a simple, clothes embedded sensor to monitor the condition of the cardiovascular system.

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Apr 2020 • SCIENTIFIC REPORTS

Non-Invasive Imaging Through Scattering Medium by Using a Reverse Response Wavefront Shaping Technique (vol 9, 12275, 2019)

Abhijit Sanjeev, Yuval Kapellner, Nadav Shabairou, Eran Gur, Moshe Sinvani, Zeev Zalevsky


Apr 2020 • Tissue Optics and Photonics 11363, 113631E, 2020

Remote thermal sensing of tissues based upon analysis of time-changing back-scattered speckle patterns

Matan Benyamin, Hadar Genish, Ran Califa, Nissan Ozana, Ariel Schwarz, Zeev Zalevsky

The ability to remotely extract temperature from a specific location using back scattered light analysis is very applicable. In this paper we present the first step towards remote sensing of temperature by using several approaches based upon conventional neural network analysis of the back scattered speckle patterns, analysis of the speckle patterns decorrelation time constant and Photoplethysmogram measurements.

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Apr 2020

Low-Frequency Raman Spectroscopy as a Diagnostic Tool for COVID-19 and other Coronaviruses

Vinayaka Harshothama Damle, Bharathi Rajeswaran, Yaakov R Tischler

Amidst the current worldwide COVID-19 pandemic, improved diagnostic tools are of vital importance. Low-Frequency Raman (LFR) Spectroscopy provides a robust theoretical scientific basis for eventual development of a non-invasive Diagnostic Tool for specimens or patients directly. This preliminary research will begin mapping the nanostructure of COVID-19 via LFR and regular Raman Spectroscopy, in comparison with different Coronaviruses and other viral materials, helping to lay a groundwork for future research. In addition to its distinct nanostructure, effects on it by thermal fluctuations or decomposition, decay under laser excitation, and interference from buffers will be examined.

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Apr 2020 • ACS Publications, 2020

Polyhedral Water Droplets: Shape Transitions and Mechanism

Eli Sloutskin

While classical liquid droplets are rounded, transitions have recently been discovered which render polyhedral water-suspended droplets of several oils. Yet, the mechanism of these transitions and the role of the droplets’ interfacial curvature in inducing these transitions remain controversial. In particular, one of the two mechanisms suggested mandates a convex interface, in a view from the oil side. Here we show that oil-suspended water droplets can spontaneously assume polyhedral shapes, in spite of their concave interface. These results strongly support the alternative mechanism, where the faceting in both oil and water droplets is driven by the elasticity of a crystalline monolayer, known to self-assemble at the oil–water interface, independent of its curvature. The faceting transitions in the water droplets allow the fundamental elastic properties of two-dimensional matter to be probed, enable new strategies in …

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Apr 2020 • Chemistry of Materials

Halide Diffusion in MAPbX3: Limits to Topotaxy for Halide Exchange in Perovskites

Aya Osherov, Yishay Feldman, Ifat Kaplan-Ashiri, David Cahen, Gary Hodes

We study halide exchange in the prototypical halide perovskite, methylammonium lead trihalide, MAPbX3 (X = halide), to test and possibly experimentally use halide diffusion in these materials. We use macroscopic single crystals to study the fundamental exchange process(es) so as to minimize possible grain boundary and surface diffusion effects. Initially, halide exchange creates normal concentration gradients of the outgoing and incoming halides, on a scale of a few microns to a few hundred microns. The depth (from the surface) of the substituted volume depends on the halide pair and on which one is exchanged and which is exchanging. The concentration gradient of the incoming halides decreases from the crystal surface toward its inner core and vice versa for the out-going halides; the profiles roughly fit diffusion in a semi-infinite specimen. This concentration gradient changes slowly with time, with the …

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Apr 2020 • Advanced Quantum Technologies

Entanglement between Distant Regions in Disordered Quantum Wires

Yishai Schreiber, Richard Berkovits

The entanglement negativity for spinless fermions in a strongly disordered 1D Anderson model is studied. For two close regions, the negativity is log‐normally distributed, and is suppressed by repulsive interactions. With increasing distance between the regions, the typical negativity decays, but there remains a peak in the distribution, also at high values, representing highly entangled distant regions. For intermediate distances, in the noninteracting case, two distinct peaks are observed. As a function of interaction strength, the two peaks merge into each other. The abundance and nature of these entangled regions is studied. The relation to resonances between single‐particle eigenstates is demonstrated. Thus, although the system is strongly disordered, it is nevertheless possible to encounter two far‐away regions which are entangled.

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Apr 2020 • Proc. of SPIE Vol

Frontiers in Biological Detection: From Nanosensors to Systems XII

Amos Danielli, Benjamin L Miller, Sharon M Weiss

The papers in this volume were part of the technical conference cited on the cover and title page. Papers were selected and subject to review by the editors and conference program committee. Some conference presentations may not be available for publication. Additional papers and presentation recordings may be available online in the SPIE Digital Library at SPIEDigitalLibrary. org.

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Apr 2020 • Journal of The Electrochemical Society

Preface—JES Focus Issue on Heterogeneous Functional Materials for Energy Conversion and Storage

Doron Aurbach, Thomas F Fuller, David E Cliffel, Wilson KS Chiu, Vito Di Noto, Srikanth Gopalan, Nian Liu, Alice H Suroviec

It is our pleasure to present a focus issue on Heterogeneous Functional Materials (HeteroFoaMs), which are pervasive in electrochemical devices for energy conversion and storage. These devices consist of multiple materials combined at multiple scales (from atomic to macro) that actively interact during their functional history in a manner that controls their collective performance as a system at the global level. The principal motivation for this special issue will be to provide a forum to discuss the science that controls emergent properties in heterogeneous functional materials as a foundation for design of functional material devices with performance not bounded by constituent properties. In response to this need, Symposium I05 Heterogeneous

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Apr 2020 • Molecular biology of the cell

Cell cycle oscillators underlying orderly proteolysis of E2F8

Danit Wasserman, Sapir Nachum, Meital Cohen, Taylor P Enrico, Meirav Noach-Hirsh, Jasmin Parasol, Sarit Zomer-Polak, Naomi Auerbach, Evelin Sheinberger-Chorni, Hadas Nevenzal, Nofar Levi-Dadon, Xianxi Wang, Roxane Lahmi, Efrat Michaely, Doron Gerber, Michael J Emanuele, Amit Tzur

E2F8 is a transcriptional repressor that antagonizes E2F1 at the crossroads of the cell cycle, apoptosis, and cancer. Previously, we discovered that E2F8 is a direct target of the APC/C ubiquitin ligase. Nevertheless, it remains unknown how E2F8 is dynamically controlled throughout the entirety of the cell cycle. Here, using newly developed human cell-free systems that recapitulate distinct inter-mitotic and G1 phases and a continuous transition from prometaphase to G1, we reveal an interlocking dephosphorylation switch coordinating E2F8 degradation with mitotic exit and the activation of APC/CCdh1. Further, we uncover differential proteolysis rates for E2F8 at different points within G1 phase, accounting for its accumulation in late G1 while APC/CCdh1 is still active. Finally, we demonstrate that the F-box protein Cyclin F regulates E2F8 in G2-phase. Altogether, our data define E2F8 regulation throughout the cell …

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Apr 2020 • Journal of The Electrochemical Society

Preface—JES Focus Issue on Challenges in Novel Electrolytes, Organic Materials, and Innovative Chemistries for Batteries in Honor of Michel Armand

Dominique Guyomard, Vito Di Noto, Maria Forsyth, Philippe Poizot, Teofilo Rojo, Karim Zaghib, Brett Lucht, Doron Aurbach

This JES focus issue is devoted to a very broad range of topics related to battery research, including various families of novel electrolytes and innovative electrodes materials, the development of metal/electrolyte interfaces, and groundbreaking cell designs and chemistries. Following the AiMES 2018 Meeting (A02 symposium), this special issue is dedicated to the work of one of the world leaders of the battery community Dr. Michel Armand, Emeritus Researcher at French CNRS, and presently working at CIC-Energigune in Spain and at Deakin University in Australia. During his career Michel Armand has led the community with outstanding and inspiring contributions to the field of battery electrochemistry with major industrial applications. Dr. Armand has impressively pioneered numerous theoretical concepts and practical applications in the field of energy-related electrochemistry. He ushered the concept of …

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Apr 2020 • ACS applied materials & interfaces

Assembly of conductive polyaniline microstructures by a laser-induced microbubble

Eitan Edri, Nina Armon, Ehud Greenberg, Elad Hadad, Michael R Bockstaller, Hagay Shpaisman

Micropatterns of conductive polymers are key for various applications in the fields of flexible electronics and sensing. A bottom-up method that allows high-resolution printing without additives is still lacking. Here, such a method is presented based on microprinting by the laser-induced microbubble technique (LIMBT). Continuous micropatterning of polyaniline (PANI) was achieved from a dispersion of the emeraldine base form of PANI (EB-PANI) in n-methyl-2-pyrrolidone (NMP). A focused laser beam is absorbed by the EB-PANI nanoparticles and leads to formation of a microbubble, followed by convection currents, which rapidly pin EB-PANI nanoparticles to the bubble/substrate interface. Micro-Raman spectra confirmed that the printed patterns preserve the molecular structure of EB-PANI. A simple transformation of the printed lines to the conducting emeraldine salt form of PANI (ES-PANI) was achieved by doping …

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Apr 2020 • arXiv preprint arXiv:2004.09247

High-speed x-ray imaging with single-pixel detector

O Sefi, Y Klein, E Strizhevsky, IP Dolbnya, S Shwartz

We demonstrate experimentally the ability to use a single pixel detector for two-dimensional high-speed and high-resolution x-ray imaging. We image the rotation of a spinning chopper at 100-kHz at spatial resolution of about 15 microns by using the computational ghost imaging approach. The technique we develop can be used for the imaging of high-speed periodic dynamics or periodically stimulated effects with a large field of view and at low dose.

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Apr 2020 • Ultrasonics sonochemistry

Sonochemical preparation of polyaniline@ TiO2 and polyaniline@ SiO2 for the removal of anionic and cationic dyes

Moorthy Maruthapandi, Lakshmanan Eswaran, John HT Luong, Aharon Gedanken

Polyaniline (PANI) synthesized by simple CDs (carbon dots) initiated polymerization has formed a composite with TiO2 and SiO2, respectively via a sonochemical method. These PANI@TiO2 and PANI@SiO2 composites were proven as effective adsorbent materials to rapidly adsorb the anionic and cationic dyes from wastewater at neutral pH and ambient temperature. Selected popular cationic and anionic organic dyes consisted of methylene blue (MB), brilliant blue (BB), Evans blue (EB), crystal violet (CV), Congo red (CR), rhodamine B (RB), and rhodamine 6G (R6G). The adsorption equilibria were governed by Langmuir and Freundlich isotherms. The kinetic results revealed that the PANI@TiO2 and PANI@SiO2 composite materials synthesized via the sonochemical method are efficient adsorbents compared to other adsorbent materials for the removal of organic dyes from the water. The adsorbed dyes were …

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Apr 2020 • Advanced Quantum Technologies

Entanglement between Distant Regions in Disordered Quantum Wires

Yishai Schreiber, Richard Berkovits

The entanglement negativity for spinless fermions in a strongly disordered 1D Anderson model is studied. For two close regions, the negativity is log‐normally distributed, and is suppressed by repulsive interactions. With increasing distance between the regions, the typical negativity decays, but there remains a peak in the distribution, also at high values, representing highly entangled distant regions. For intermediate distances, in the noninteracting case, two distinct peaks are observed. As a function of interaction strength, the two peaks merge into each other. The abundance and nature of these entangled regions is studied. The relation to resonances between single‐particle eigenstates is demonstrated. Thus, although the system is strongly disordered, it is nevertheless possible to encounter two far‐away regions which are entangled.

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Apr 2020 • ACS Photonics

Development of lipid-coated semiconductor nanosensors for recording of membrane potential in neurons

Anastasia Ludwig, Pablo Serna, Lion Morgenstein, Gaoling Yang, Omri Bar-Elli, Gloria Ortiz, Evan Miller, Dan Oron, Asaf Grupi, Shimon Weiss, Antoine Triller

In the past decade, optical imaging methods have significantly improved our understanding of the information processing principles in the brain. Although many promising tools have been designed, sensors of membrane potential are lagging behind the rest. Semiconductor nanoparticles are an attractive alternative to classical voltage indicators, such as voltage-sensitive dyes and proteins. Such nanoparticles exhibit high sensitivity to external electric fields via the quantum-confined Stark effect. Here we report the development of semiconductor voltage-sensitive nanorods (vsNRs) that self-insert into the neuronal membrane. To facilitate interaction of the nanorods with the membrane, we functionalized their surface with the lipid mixture derived from brain extract. We describe a workflow to detect and process the photoluminescent signal of vsNRs after wide-field time-lapse recordings. We also present data indicating …

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Apr 2020 • arXiv preprint arXiv:2004.02723

Efimov energy level rebounding off the atom-dimer continuum

Yaakov Yudkin, Roy Elbaz, Lev Khaykovich

The Efimov effect, with its ladder of weakly bound three-atomic molecules, poses intriguing questions in the theoretically controversial and experimentally demanding regime of merging of the first excited Efimov energy level with the atom-dimer continuum. Using an original experimental technique, where a coherent superposition state of diatomic and triatomic molecules is utilized, we investigate this regime and reveal a striking behavior: Instead of merging with the atom-dimer continuum the trimer energy level rebounds from it and becomes a deeper bound state again. In addition, instead of a tangential approach between the two levels we observe a rather narrow resonance, providing a new challenge and guide for few-body theories to incorporate realistic interatomic potentials.

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Apr 2020 • Diamond and Related Materials

Disaggregation, stabilization, and innovative functionalization/surface engineering of detonation nanodiamonds via ultrasonication-promoted ceric ammonium nitrate treatment

D Itshak-Levy, LL Israel, B Schmerling, S Kannan, H Sade, S Michaeli, ...

We present a novel method for aqueous effective disaggregation, dispersion, and stabilization of detonation nanodiamonds (NDs) that also allows easy further second-step nanodiamond (ND) functionalization/surface engineering through lanthanide-based coordination chemistry. This method includes ultrasonic irradiation of NDs in the presence of a strong mono-electronic ceric ammonium nitrate (CAN, [Ce(IV)(NH4)2(NO3)6]) oxidant. The resulting CAN-treated NDs are positively charged with lanthanide [CeLn]3/4+ complexes/cations, enabling an anti-aggregation effect together with the ability to be further surface-modified through [CeLn]3/4+ ligand exchange (lanthanide coordinative chemistry). Therefore, this method produces ~10 nm-sized CAN-modified nanoparticles (NDs-CAN NPs) that are highly positively charged (ξ potential maximal value: +45.7 mV & average zeta potential: +34.6 mV). The obtained …

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Apr 2020 • Nonlinear Optics and its Applications 2020 11358, 113581O, 2020

Temporal imaging system based on four-wave mixing interaction which does not require synchronization to a pump wave

Avi Klein, Inbar Sibony, Sara Meir, Ori Freedman, Shir Shahal, Michelle Y Sander, Moti Fridman

Temporal imaging system have enabled imaging of ultrafast phenomena with high temporal resolution different ultrafast phenomena. Specifically, time-lenses which are based on nonlinear interaction of four-wave mixing have a wide field of view together with high F-number. These offers temporal imaging system with large magnifications in the time-domain. However, when considering a time-lens based on four-wave mixing interaction, the input signal must be synchronized to the pump wave which makes it challenging for measuring any ultrafast phenomena with unknown time-of-arrival. Therefore, we developed a temporal imaging system which does not require this synchronization between a signal and a pump wave. This is done by generating time-lenses with high repetition-rate. Therefore, any input signal will interact with one of the time-lenses and it will be imaged in time with high probability. In this …

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Apr 2020 • Nonlinear Optics and its Applications 2020 11358, 113581N, 2020

Time-lenses placed in an array with overlapping between adjecent time-lenses

Avi Klein, Inbar Sibony, Sara Meir, Ori Freedman, Shir Shahal, Hamootal Duadi, Moti Fridman

Time-lenses in general proved to be useful for many applications and specifically when utilizing them for temporal imaging schemes where they can image ultrafast signals that cannot be detected by any electronic based device. Over the last few years, we demonstrated that when joining together several time-lenses into a single time-lens array, it is possible to gain more information on the input signal. Such as measuring temporal depth imaging, the state of polarization of the input signal as a function of time, and retrieving the phase dynamics. However, when designing an array of time-lenses, there is a trade-off between joining large number of small time-lenses, so each signal will interact with many time-lenses but each one has low resolution, and joining small number of large time-lenses, so each has better temporal resolution but on the expanse of interacting with smaller number of time-lenses in the array. We …

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Apr 2020 • Applied Surface Science

Engineering of new durable cross-linked poly (styryl bisphosphonate) thin coatings onto polypropylene films for biomedical applications

Hanna P Steinmetz, Elisheva Sason, Tammy Lublin-Tennenbaum, Shlomo Margel

Bone tissue engineering uses biocompatible biomaterials to stimulate bone regeneration. Bone has two major components, organic collagen fibers and inorganic hydroxyapatite (HAP) which makes up about 60 percent of bone. Bisphosphonates (BPs) are compounds which are used clinically for bone disorders because of their high affinity for calcium ions. Previously, we reported on the synthesis of cross-linked poly(styryl bisphosphonate) nanoparticles (poly(StBP) NPs) which demonstrated a strong affinity for calcium ions. Here, we describe the use of these NPs for the synthesis of new durable cross-linked poly(StBP) thin coatings on corona-treated polypropylene films by means of a simple method of UV-curing. To produce the coatings, poly(StBP) NPs were mixed with the cross-linking monomer poly(ethylene glycol) dimethacrylate and a photo-initiator, spread on the PP films using a Mayer rod, and then UV …

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