Article
Chemistry, Physical
Manuel Rubio, Samir Sadek, Emilio Jose Vega, Alfonso Miguel Ganan-Calvo, Jose Maria Montanero
Summary: The study experimentally determines the impact of mechanical anisotropy on electric charge transport in a viscoelastic solution, finding that the conductivity remains consistent in the stretching direction but decreases at the end of the elasto-capillary regime. The research provides the first experimental evidence of ion mobility reduction in stretching viscoelastic filaments, which is important for applications like electrospinning.
Article
Chemistry, Analytical
Dan Yuan, Sheng Yan, Jun Zhang, Rosanne M. Guijt, Qianbin Zhao, Weihua Li
Summary: This study introduces a novel method to separate shape-synchronized cyanobacterial cell populations using viscoelastic microfluidics, which opens up a new field of application in microfluidics technology.
ANALYTICAL CHEMISTRY
(2021)
Article
Physics, Fluids & Plasmas
A. Rubio, F. J. Galindo-Rosales, E. J. Vega, J. M. Montanero, M. G. Cabezas
Summary: This paper investigates the viscoelastic transition in transonic flow focusing when polymers of low molecular weights are dissolved in water at the appropriate concentration. The phenomenon is explained through the coil-stretch transition of polymers crossing the tapering meniscus, where high strain rates are produced by the airstream. The resulting elastic stress stabilizes the flow, leading to thinner and longer jets compared to Newtonian fluids, which has important implications at the technological level.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Chemistry, Analytical
Minhui Liang, Dahou Yang, Yinning Zhou, Peixian Li, Jianwei Zhong, Ye Ai
Summary: The study introduces a high-throughput cellular mechanical phenotyping technique based on a microfluidic system, which extracts cell mechanical characteristics through rapid single-cell hydrodynamic stretching and successfully measures the deformability differences of cells.
ANALYTICAL CHEMISTRY
(2021)
Article
Mechanics
Naoki Horiguchi, Hiroyuki Yoshida, Akiko Kaneko, Yutaka Abe
Summary: In this study, the atomization behavior of a wall-impinging liquid jet in a shallow pool was investigated using numerical simulation and a dispersed-phase tracking method. The results revealed three patterns of droplet formation and theoretical boundaries were established using dimensionless numbers. The mechanisms of droplet formation were identified and the relationship between local behavior and overall atomization of the jet was established. This study clarifies the atomization mechanisms in the liquid film flow of a wall-impinging liquid jet in a shallow pool.
Article
Mathematics, Interdisciplinary Applications
Tao Jiang, Yue Li, Peng-Nan Sun, Jin-Lian Ren, Qiang Li, Jin-Yun Yuan
Summary: This work proposes a new viscoelastic two-phase CWCSPH-IT model combined with improved interface treatments for investigating high density ratio two-phase flows. Through simulations of benchmark problems, the model's validity and reliability in handling complex viscous or viscoelastic multi-phase problems have been demonstrated.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Mechanics
Abhishek Banerjee, Olga M. Lavrenteva, Irina Smagin, Avinoam Nir
Summary: The study reports the dynamics of a viscoplastic torus suspended in an unbounded Newtonian medium, subjected to an axisymmetric compressional flow. Numerical simulations of the torus drop with circular cross section show three different scenarios of drop evolution depending on initial conditions, capillary number, Bingham number, and viscosity ratio.
Article
Chemistry, Physical
S. Tamim, J. B. Bostwick
Summary: This study examines the instability of soft cylindrical interfaces and cylindrical cavities due to the competition between elasticity and capillarity. Elasticity stabilizes the instability while compressibility destabilizes it. The critical wavenumber shows a more complex dependence upon compressibility for the cylinder but exhibits a predictable trend for the cylindrical cavity.
Article
Physics, Fluids & Plasmas
Xiao Liu, Brayden W. Wagoner, Osman A. Basaran
Summary: This study investigates the contraction of viscoelastic liquid filaments, demonstrating that filaments with prestress exhibit significantly increased retraction velocity at the tips. The enhancement is explained by examining the relationship between elastic stress and the rate-of-strain tensor.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Mechanics
Ali Lafzi, Sadegh Dabiri
Summary: The dynamics of a droplet in oscillatory and pulsating flows of a Newtonian fluid in a microchannel have been studied numerically, exploring the effects of oscillation frequency, surface tension, and channel flow rate. The simulation results are sensitive to grid resolution due to the unsteady behavior of the base flow, and a set of fine grids have been used to capture the physics of the problem accurately. To reduce computational costs, a multifidelity Gaussian processes method with two levels of fidelity has been used to predict results and uncertainties based on correlations with coarse-grid cases.
Article
Physics, Fluids & Plasmas
Alienor Riviere, Daniel J. Ruth, Wouter Mostert, Luc Deike, Stephane Perrard
Summary: The size distribution of bubbles below a breaking wave is crucial for understanding mass exchanges between the atmosphere and oceans. This study finds a power-law scaling relationship between the size distribution of small bubbles and the Hinze scale, and explains that small bubbles are generated by capillary effects.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Thermodynamics
Rihui Jin, Hongfei Zheng, Zhiyong Zhao, Xinglong Ma, Lu Wang, Chunhua Qi, Hui Kong
Summary: The large mass transfer spacing in conventional solar stills causes a large mass transfer resistance and low space utilization. Convection mass transfer in vertical diffusion stills is always inhibited at small spacing due to the commonly used planar wicks. This paper presents a binary string-of-beads flow array for solar desalination using fibers instead of planar wicks, thus solving those problems and enabling coupled diffusion-convection mass transfer at small spacing. The prototype of the distiller demonstrates higher energy and space utilization, with a maximum thermal-water conversion efficiency of 0.81 and a maximum water productivity per unit volume of 56.3 kg/h/m3. The research provides new ideas for efficient freshwater production in remote off-grid areas.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mechanics
S. A. Vagner, S. A. Patlazhan, C. A. Serra, D. Funfschilling, V. G. Kulichikhin
Summary: This study focuses on the mechanisms of dripping and jetting flow modes of viscoelastic semi-dilute polyacrylamide aqueous solutions co-flowing with silicone oil. A phase diagram of different flow modes is established, showing the control of filament elongation velocity in dripping mode and the evolution of thread diameter in jetting mode. The universal evolution of filament and bead sizes, independent of concentration and flow rates, is revealed.
Article
Engineering, Manufacturing
Marcin P. Serdeczny, Raphael Comminal, Md. Tusher Mollah, David B. Pedersen, Jon Spangenberg
Summary: This study introduces a novel CFD model for simulating the non-isothermal flow of a viscoelastic fluid through the hot-end in MEX, with a focus on predicting filament feeding force and optimizing the process. The viscoelastic model outperforms the commonly used Newtonian Fluid approximation, accurately capturing the influence of process conditions on feeding force and suggesting potential minimization strategies.
VIRTUAL AND PHYSICAL PROTOTYPING
(2022)
Article
Chemistry, Multidisciplinary
Yanpeng Dong, Xingyu Xiang, Zhongdong Wang, Chunying Zhu, Youguang Ma, Taotao Fu
Summary: In this study, the distribution of fluid flow, as well as the uniformity and stability of droplets, in asymmetrical parallelized microchannels were explored using a high-speed camera. The effects of pressure difference fluctuation at the T-junction, hydrodynamic resistance in microchannels, and shear-thinning property of fluids on flow distribution and droplet formation were revealed. The uniformity and stability of droplets in microdevices with different cavity settings were compared, and an optimal configuration was proposed. Prediction models for the flow distribution of shear-thinning fluids in asymmetrical parallelized microchannels were also established.
Article
Physics, Applied
S. B. Fairchild, Thiago A. de Assis, J. H. Park, M. Cahay, J. Bulmer, D. E. Tsentalovich, Yee Sin Ang, L. K. Ang, J. Ludwick, T. C. Back, M. Pasquali
Summary: The study investigated the field electron emission properties of carbon nanotube films, revealing their anisotropic morphology. It was found that films with a parallel alignment configuration produced the highest emission currents. Compared to films with a perpendicular alignment configuration, those with a parallel alignment configuration exhibited less surface damage after field emission experiments.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Lauren W. Taylor, Steven M. Williams, J. Stephen Yan, Oliver S. Dewey, Flavia Vitale, Matteo Pasquali
Summary: Research using carbon nanotube threads for electronic accessories shows great potential in the field of wearable electronics, providing soft, comfortable electronic textiles with excellent signal transmission capabilities.
Editorial Material
Multidisciplinary Sciences
Matteo Pasquali, Carl Mesters
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
Natsumi Komatsu, Yota Ichinose, Oliver S. Dewey, Lauren W. Taylor, Mitchell A. Trafford, Yohei Yomogida, Geoff Wehmeyer, Matteo Pasquali, Kazuhiro Yanagi, Junichiro Kono
Summary: Low-dimensional materials, particularly carbon nanotubes, have shown promising potential as thermoelectric materials due to their unique properties. The challenge lies in preserving their large power factor in macroscopic assemblies, which has been addressed in this study through improved sample morphology and Fermi energy tuning. The achieved ultrahigh power factor makes these carbon nanotube fibers strong candidates for applications requiring both high thermoelectric power factor and thermal conductivity.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Dongju Lee, Seo Gyun Kim, Seungki Hong, Cristina Madrona, Yuna Oh, Min Park, Natsumi Komatsu, Lauren W. Taylor, Bongjin Chung, Jungwon Kim, Jun Yeon Hwang, Jaesang Yu, Dong Su Lee, Hyeon Su Jeong, Nam Ho You, Nam Dong Kim, Dae-Yoon Kim, Heon Sang Lee, Kun-Hong Lee, Junichiro Kono, Geoff Wehmeyer, Matteo Pasquali, Juan J. Vilatela, Seongwoo Ryu, Bon-Cheol Ku
Summary: Multidimensional nanostructures formed by coalescence of carbon nanotubes can create fibers with exceptional mechanical and electrical properties.
Article
Multidisciplinary Sciences
Robert J. Headrick, Steven M. Williams, Crystal E. Owens, Lauren W. Taylor, Oliver S. Dewey, Cedric J. Ginestra, Lucy Liberman, Asia Matatyaho Ya'akobi, Yeshayahu Talmon, Benji Maruyama, Gareth H. McKinley, A. John Hart, Matteo Pasquali
Summary: Chlorosulfonic acid and oleum were used as solvents to transform disordered carbon nanotubes (CNTs) into precise and functional morphologies. A novel acid solvent system based on methanesulfonic or p-toluenesulfonic acids was developed with low corrosivity, allowing the formation of true CNT solutions at concentrations as high as 10 g/liter. This solvent system showed versatility in various manufacturing processes and achieved high performance optoelectronic properties through continuous slot coating.
Article
Multidisciplinary Sciences
Cedric J. Simonsen Ginestra, Cecilia Martinez-Jimenez, Asia Matatyaho Ya'akobi, Oliver S. Dewey, Ashleigh D. Smith McWilliams, Robert J. Headrick, Jesus A. Acapulco, Lyndsey R. Scammell, Michael W. Smith, Dmitry Kosynkin, Daniel M. Marincel, Cheol Park, Sang-Hyon Chu, Yeshayahu Talmon, Angel A. Marti, Matteo Pasquali
Summary: This study demonstrates the formation of BNNT liquid crystals in chlorosulfonic acid (CSA) that can be used to produce macroscopically aligned fibers of BNNTs, with potential high-performance applications.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Asia Matatyaho Ya'akobi, Cedric J. S. Ginestra, Lyndsey R. Scammell, Michael W. Smith, Matteo Pasquali, Yeshayahu Talmon
Summary: This study investigates boron nitride nanotubes (BNNTs) synthesized by the high temperature-pressure (HTP) method and compares their properties after different purification processes using advanced electron microscopy techniques. The results show that BNNTs of higher purity form small, ordered domains at lower concentrations and defects do not prevent their nematic alignment. Cryogenic electron microscopy provides direct-imaging evidence of the BNNT liquid crystalline phase, suggesting the potential for the fabrication of highly ordered BNNT-based macroscopic assemblies through liquid-phase processing.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Paul A. Advincula, Wei Meng, Lucas J. Eddy, Jacob L. Beckham, Ivan R. Siqueira, Duy Xuan Luong, Weiyin Chen, Matteo Pasquali, Satish Nagarajaiah, James M. Tour
Summary: Graphene has been proven to be a valuable additive for composites, but its expensive synthesis has hindered its industrial application. However, a method called Flash Joule heating can rapidly synthesize graphene from coal materials like metallurgical coke. This study investigates the properties of graphene-epoxy composites with higher nanofiller content than previously reported. The results show that these composites exhibit improved mechanical properties and reduced environmental impact.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Review
Nanoscience & Nanotechnology
Mijin Kim, Dana Goerzen, Prakrit V. Jena, Emma Zeng, Matteo Pasquali, Rachel A. Meidl, Daniel A. Heller
Summary: This Perspective discusses the unique physicochemical properties of carbon nanotubes and their potential risks to human health and the environment. It emphasizes the need to precisely define carbon nanotubes and provide science-based policy information to facilitate R&D and regulation. The significance of life-cycle assessments for carbon nanotubes is highlighted, along with recommendations for informing policy decisions.
NATURE REVIEWS MATERIALS
(2023)
Article
Chemistry, Physical
Zhao Tang, Shannon L. Eichmann, Brahim Lounis, Laurent Cognet, Frederick C. MacKintosh, Matteo Pasquali
Summary: Studying the Brownian motion of fibers and semi-flexible filaments in porous media is crucial for understanding transport and mechanical properties. This study uses video microscopy to visualize the motion and transport of semi-flexible carbon nanotubes in packed-colloid porous media. The results show that the structure of the porous media controls the diffusion and reorientation of the nanotubes.
Article
Chemistry, Multidisciplinary
Antonio Dominguez-Alfaro, Ngoc Do Quyen Chau, Stephen Yan, Donato Mancino, Sushma Pamulapati, Steven Williams, Lauren W. Taylor, Oliver S. Dewey, Matteo Pasquali, Maurizio Prato, Alberto Bianco, Alejandro Criado
Summary: This study describes the covalent modification of carbon nanotube fibers (CNTFs) through electrochemical reduction and oxidation, resulting in diverse surface functionalities while preserving the bulk properties of the fibers.
Proceedings Paper
Engineering, Electrical & Electronic
Crystal E. Owens, Jon Ludwick, Joy Y. Ma, Robert J. Headrick, Steven M. Williams, Megan Creichton, Tyson C. Back, Benji Maruyama, Matteo Pasquali, Gareth H. McKinley, A. John Hart
Summary: The new method involves pointwise deposition of aqueous suspensions of carbon nanotubes to fabricate fiber-like field emitters with high aspect ratios, dense packing of CNTs, and a large base for mechanical stability and enhanced thermal/electrical contact. This results in excellent field emission properties, including a high field enhancement factor and low turn-on voltage for various emitter sizes, motivating further research on emitter array manufacturing and device integration.
2021 21ST INTERNATIONAL CONFERENCE ON SOLID-STATE SENSORS, ACTUATORS AND MICROSYSTEMS (TRANSDUCERS)
(2021)
Article
Chemistry, Physical
Vida Jamali, Francesca Mirri, Evan G. Biggers, Robert A. Pinnick, Lucy Liberman, Yachin Cohen, Yeshayahu Talmon, Fred C. MacKintosh, Paul van der Schoot, Matteo Pasquali
Summary: Studies show that as the concentration of CNT solution increases, CNTs self-assemble into a liquid crystalline phase with a pleated texture and large inter-particle spacing, potentially indicating a transition to higher-order liquid crystalline phases. The presence of thermal undulations can enhance the electrostatic repulsion of CNTs and increase their effective diameter. Thermal undulations start to affect steric forces at concentrations as low as the isotropic cloud point in CNT solutions.
Article
Nanoscience & Nanotechnology
Ashleigh D. Smith McWilliams, Cecilia Martinez-Jimenez, Asia Matatyaho Ya'akobi, Cedric J. Ginestra, Yeshayahu Talmon, Matteo Pasquali, Angel A. Mart
Summary: Hexagonal boron nitride (hBN) has unique properties suitable for various applications, and stable dispersion of hBN nanosheets is crucial for industrial production of hBN materials. Research shows that the use of surfactants can affect the dispersion quality and stability of hBN, with ionic surfactants showing better dispersing effects for high-quality dispersions.
ACS APPLIED NANO MATERIALS
(2021)