Article
Chemistry, Multidisciplinary
Mei Wang, Chiwoo Park, Taylor J. Woehl
Summary: This study utilized liquid phase transmission electron microscopy to directly observe the self-assembly of platinum nanoparticles into dense 3D supraparticles over tens of seconds during colloidal nanoparticle synthesis. Varying interparticle interactions by changing precursor chemistry revealed that supraparticle formation was driven by weak attractive van der Waals forces balanced by short ranged repulsive steric interactions. Growth kinetic measurements and an interparticle interaction model showed that nanoparticle surface diffusion rates on the supraparticles were significantly faster than nanoparticle attachment.
Article
Electrochemistry
Veronika K. Laurinavichyute, Shavkat Nizamov, Vladimir M. Mirsky
Summary: Analyzing the early stage of electrochemical nucleation is essential for understanding the mechanism of the process and synthesizing new materials. The wide field surface plasmon microscopy (WF-SPRM) allows for real-time monitoring of nucleus growth, providing information on size, formation time, location, and growth kinetics, aiding in distinguishing the rate limiting stage for each nucleus.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Juhyung Lee, Junhyeok Bang, Joongoo Kang
Summary: This article investigates the nonequilibrium dynamics of charge-density-wave (CDW) melting in van der Waals (vdW) heterostructures using real-time time-dependent density functional theory coupled to molecular dynamics. The study finds that despite fast and sufficient charge transfer, the electronic excitation of vdW heterostructures does not result in nonthermal CDW transition. Instead, the TaS2 lattice is heated by carrier-lattice scattering, leading to thermal CDW melting at high ionic temperatures.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Biology
Edward R. Polanco, Tarek E. Moustafa, Andrew Butterfield, Sandra D. Scherer, Emilio Cortes-Sanchez, Tyler Bodily, Benjamin T. Spike, Bryan E. Welm, Philip S. Bernard, Thomas A. Zangle
Summary: This article introduces a real-time and label-free approach based on quantitative phase imaging to determine drug sensitivity, which has significant advantages over endpoint viability or metabolic assays, and reveals single cell response heterogeneity.
COMMUNICATIONS BIOLOGY
(2022)
Article
Chemistry, Physical
Ariel Rogers, Isabelle I. Niyonshuti, Alice Cai, Feng Wang, Mourad Benamara, Jingyi Chen, Yong Wang
Summary: The study focuses on the kinetics of laser-induced nanowelding of silver nanoparticles (AgNPs), with an observation that laser illumination leads to the formation of higher-order structures of AgNPs. An analytical model based on simple polymerization was developed to predict and understand the dynamics, and experimental verification was conducted by varying laser power and AgNP concentration. The merging of assemblies and diffusion-limited kinetics of laser-induced assembling were taken into account for improved modeling, and the asynchronous blinking behaviors of different regions within formed structures were observed.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Abhijit H. Phakatkar, Constantine M. Megaridis, Tolou Shokuhfar, Reza Shahbazian-Yassar
Summary: The study focuses on ice nucleation and growth at the nanoscale, which is important in geological and atmospheric sciences. However, existing transmission electron microscopy approaches have not been successful in directly imaging ice formation. The use of TiO2 radical scavengers in graphene liquid cells is demonstrated to enable the observation of ice nucleation phenomena at low temperatures. Atomic-resolution imaging reveals the nucleation and growth of cubic ice-phase crystals at close proximity to TiO2-water nanointerfaces at low temperatures.
Article
Optics
Liao Ma, Ning Leng, Ming Jin, Ming Bai
Summary: This paper presents an innovative optically controlled plasma scattering technique for imaging electromagnetic fields. The plasma induced by the photoconductive effect is used as an optically controlled scattering probe to image the amplitude and phase of electromagnetic fields in real time. This method offers advantages such as ultrafast speed, super-resolution, ultra-wideband response, low-cost, and vectorial wave mapping ability.
Article
Chemistry, Multidisciplinary
Amnon Rothman, Kristyna Bukvisova, Noya Ruth Itzhak, Ifat Kaplan-Ashiri, Anna Eden Kossoy, Xiaomeng Sui, Libor Novak, Tomas Sikola, Miroslav Kolibal, Ernesto Joselevich
Summary: This study uses in situ scanning electron microscopy (SEM) to observe the real-time growth of surface-guided nanowires. The study reveals that the nanowires elongate along the substrate nanogrooves and push the catalytic droplet at the top of the nanowire. The study also uncovers some competing mechanisms and influencing factors during the growth process.
Article
Chemistry, Analytical
Nina Ogrinc, Alexandre Kruszewski, Paul Chaillou, Philippe Saudemont, Chann Lagadec, Michel Salzet, Christian Duriez, Isabelle Fournier
Summary: The study developed a novel method for in vivo mass spectrometry imaging, using SpiderMass technology and a high-accuracy robotic arm. By moving the laser probe above the sample surface and equipping the robotic arm with a sensor, images can be acquired and molecular data can be plotted directly onto a 3D topographical image without the need for image fusion.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Wancai Li, Jiaqi Ma, Xue Cheng, Dehui Li
Summary: The optoelectronic performances of layered materials are highly dependent on sample thickness, especially when the size is reduced to nanometer scale where surface effects become significant. In this study, it was found that the photoluminescence quantum yield of 2D perovskite microplates can be greatly enhanced when encapsulated by graphene, providing a cost-effective approach to improve luminescence efficiency.
Article
Chemistry, Physical
Asghar Aryanfar, Yara Ghamlouche, William A. Goddard
Summary: The study developed a feedback control framework to minimize the non-uniform growth of microstructures inside the battery during prolonged charge-discharge cycles. The control parameter is based on the maximum interface curvature to generate the most packed microstructures while minimizing total charging time.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Multidisciplinary
Marta Ruiz-Ruiz, Ana Vila-Costa, Tapas Bar, Cristian Rodriguez-Tinoco, Marta Gonzalez-Silveira, Jose Antonio Plaza, Jorge Alcala, Jordi Fraxedas, Javier Rodriguez-Viejo
Summary: A spatio-temporal map of the relaxation dynamics of a highly stable glass into its supercooled liquid is built using real-time atomic force microscopy imaging. This methodology enables direct visualization of the liquid phase progression and the presence of localized fast mobility regions separated by giant length scales. A clear correlation between dynamic length and time scales in glasses is established. This approach may also be applicable to unveil the microscopic structure and dynamics of other glass-forming systems with much shorter length and time scales, including liquid-cooled glasses.
Article
Biochemical Research Methods
Bo-Jui Chang, James D. Manton, Etai Sapoznik, Theresa Pohlkamp, Tamara S. Terrones, Erik S. Welf, Vasanth S. Murali, Philippe Roudot, Kayley Hake, Lachlan Whitehead, Andrew G. York, Kevin M. Dean, Reto Fiolka
Summary: Multiangle projection imaging accelerates volumetric imaging by converting any camera-based microscope with optical sectioning capability into a system that can capture images from multiple perspectives. This method reduces data overhead, speeds up imaging, and allows for real-time stereoscopic imaging and three-dimensional particle localization. The technology has been successfully demonstrated on various microscopes and specimens, showing potential applications in cancer cell morphodynamics, calcium signaling, and simultaneous imaging of multiple perspectives of a beating heart.
Article
Multidisciplinary Sciences
In Hyung Baek, Hyun Woo Kim, Hyeon Sang Bark, Kyu-Ha Jang, Sunjeong Park, Junho Shin, Young Chan Kim, Mihye Kim, Key Young Oang, Kitae Lee, Fabian Rotermund, Nikolay A. Vinokurov, Young Uk Jeong
Summary: Utilizing relativistic electrons and subwavelength slit waveguide, a real-time THz oscilloscope was demonstrated for time-frozen visualization of a THz optical wave.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Arkadiusz Kus
Summary: This paper introduces a simple, single-exposure holographic tomography (HT) system that can record a full set of multiplexed projections in a single hologram, providing satisfactory quality of the 3D refractive index distribution through a robust tomographic reconstruction algorithm.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Chemistry, Physical
Theo Emmerich, Kalangi S. Vasu, Antoine Nigues, Ashok Keerthi, Boya Radha, Alessandro Siria, Lyderic Bocquet
Summary: Carbon has unique properties in nanofluidics, such as fast water transport and efficient energy conversion. By fabricating activated carbon nanochannels, we have found that they outperform pristine channels in terms of surface electrification, ionic conductance, streaming current, and osmotic currents. The enhanced ionic transport is attributed to the optimal combination of high surface charge and low friction in activated carbon nanochannels.
Review
Materials Science, Multidisciplinary
Yi You, Abdulghani Ismail, Gwang-Hyeon Nam, Solleti Goutham, Ashok Keerthi, Boya Radha
Summary: This article provides an overview of recent developments in the fabrication methods for nano- and angstrom-scale fluidic channels. It categorizes the channels based on dimensionality and discusses the measurement techniques used. The article also explores the ion transport mechanisms in these channels and the effects of pore size on ionic mobility, streaming power, and osmotic power. Lastly, it highlights future opportunities in the development of smart ionic devices.
ANNUAL REVIEW OF MATERIALS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Indrajit Mondal, Nilay Awasthi, Mukhesh K. Ganesha, Ashutosh K. Singh, Giridhar U. Kulkarni
Summary: Implementing simple and inexpensive energy-saving smart technologies in households can effectively achieve on-demand privacy control and reduce energy consumption. To meet the demand of the consumer market, an unconventional smart window that is cost-effective, power-efficient, and simple to fabricate is needed. A mist-driven transparency switching glass was developed, showing significant temperature reduction and the ability to be operated wirelessly through a cellphone application, making it commercially viable and suitable for IoT integration.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
P. Robin, T. Emmerich, A. Ismail, A. Nigues, Y. You, G. -H. Nam, A. Keerthi, A. Siria, A. K. Geim, B. Radha, L. Bocquet
Summary: Experiments reveal the emergence of memory in the transport of electrolytes across nanoscale channels, which lays the foundation for biomimetic computations.
Article
Nanoscience & Nanotechnology
Suman Kundu, Subi J. George, Giridhar U. Kulkarni
Summary: A high-performance visible-blind UV photodetector using 1D supramolecular nanofibers is reported, exhibiting high responsivity, selectivity, low power consumption, and good mechanical flexibility. The device performance is improved through tweaking electronic and ionic conduction pathways and optimizing electrode material, external humidity, applied voltage bias, and introducing additional ions. The nanofiber system shows great potential for integration in future electronic gadgets.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Athanasios A. Papaderakis, Andinet Ejigu, Jing Yang, Amr Elgendy, Boya Radha, Ashok Keerthi, Anne Juel, Robert A. W. Dryfe
Summary: The unique layered structure of graphite and its tunable interlayer distance allow for the accommodation of ions into its structure. The smooth and chemically inert nature of the graphite surface makes it an ideal substrate for electrowetting. This study combines these two properties and explores the significant effect of anion intercalation on the electrowetting response of graphitic surfaces. Through in situ Raman spectroscopy, the structural changes during intercalation/deintercalation were studied, providing insights into the influence of intercalation staging on the rate and reversibility of electrowetting. By tuning the intercalant size and stage of intercalation, a fully reversible electrowetting response can be achieved. The approach is extended to biphasic (oil/water) systems, allowing for a fully reproducible electrowetting response with a near-zero voltage threshold and unprecedented contact angle variations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Solleti Goutham, Ashok Keerthi, Abdulghani Ismail, Ankit Bhardwaj, Hossein Jalali, Yi You, Yiheng Li, Nasim Hassani, Haoke Peng, Marcos Vinicius Surmani Martins, Fengchao Wang, Mehdi Neek-Amal, Boya Radha
Summary: Ionic flow through angstrom-scale channels can selectively separate ions of the same charge and hydrated size beyond steric and Coulomb effects. Two-dimensional channels have been shown to be influenced by the position of ions, leading to selectivity. Understanding and designing artificial channels that can mimic the exquisite selectivity of biological channels is a challenge, but necessary for various applications. This study investigates Å-scale artificial channels made by van der Waals assembly and demonstrates their ability to distinguish between same-charge ions based on their positions within nanoconfined water.
NATURE NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Indrajit Mondal, Mukhesh K. Ganesha, Ashutosh K. Singh, Giridhar U. Kulkarni
Summary: The major drawbacks of electrochromic smart windows (ECSWs) for zero-energy buildings include excessive cost, insufficient optical modulation, and limited functionality. A solution to this problem is proposed by optimizing the deposition conditions for WO3 sputtering on a cost-effective Al-mesh overlaid with SnO2. The optimized ECSW exhibits ultra-high switching contrast, fast response and recovery time, good cyclic stability, and excellent coloration efficiency. A large-area smart window with dual-functionality and a device with a quasi-solid electrolyte are also developed.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Tejaswini S. Rao, Suman Kundu, Bharath Bannur, Subi J. George, Giridhar U. Kulkarni
Summary: This article reports a two-terminal optically active device based on 1D supramolecular nanofibres, which mimics synaptic functions such as STP, LTP, PPF, STDP, and demonstrates its potential as a visual system.
Article
Nanoscience & Nanotechnology
Mukhesh K. Ganesha, Indrajit Mondal, Ashutosh K. Singh, Giridhar U. Kulkarni
Summary: Electrochromic (EC) devices are not widely commercialized due to their high cost. The best large-area devices in the market do not achieve a distinct dark-colored state and instead appear more like blue tinted glass. This study reports on the development of a high-performing porous WO3 thin film achieved by optimizing the sputtering process, resulting in an affordable dual-function EC energy-storage device. By using a hybrid electrode and multivalent electrolytes, the need for expensive components such as ITO electrodes and Li+ ion-based electrolytes can be eliminated while maintaining device performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Rohit Attri, Indrajit Mondal, Bhupesh Yadav, Giridhar U. Kulkarni, C. N. R. Rao
Summary: This article reports an artificial synaptic network that mimics the hierarchical structure of biological neural networks. The designed network exhibits threshold switching and ultra-low energy requirement, while providing wide range synaptic plasticity. The study reveals the scale-free correlation of enhancement in the device, suggesting its potential as an ideal platform for neuromorphic computing.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Physical
Subash Cherumannil Karumuthil, Mukhesh K. Ganesha, Indrajit Mondal, Ashutosh K. Singh, Giridhar U. Kulkarni
Summary: This study presents a cost-effective fabrication method for a dual-functional polymeric electrochromic device. By using a chemically synthesized conducting polymer as the electrochromic layer and a low-cost transparent conducting electrode, the smart window exhibits excellent optical contrast, rapid switching ability, outstanding cycling stability, and energy storage capability.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Engineering, Electrical & Electronic
Bharath Bannur, Bhupesh Yadav, Giridhar U. Kulkarni
Summary: Associative learning is crucial in shaping human behaviors. An artificial synaptic network (ASN) is proposed as a promising approach for enhancing computation speed and efficiency in neuromorphic artificial intelligence. In this study, a self-assembled Ag dewetted island network is used to fabricate the Ag-ASN synaptic device, which emulates higher-order learning without any CMOS supporting circuits. Excitingly, complex second-order conditioning is successfully emulated for the first time using this synaptic device.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
