Article
Engineering, Chemical
Pallavi Katre, Sayak Banerjee, Saravanan Balusamy, Kirti Chandra Sahu
Summary: We investigated the retention force factor of pure and binary droplets laden with alumina nanoparticles placed on an inclined substrate. The critical angle of ethanol droplet increased with nanoparticles concentration, while for water-ethanol droplets, it reached a plateau and slightly decreased after 0.6 wt% nanoparticle loading. We proposed correlations for the retention force factor and critical angle and found that evaporating droplets with nanoparticle loading exhibited richer hydrothermal waves. This study is the first attempt to investigate the retention force factor for droplets loaded with nanoparticles on an inclined substrate.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Mahesh Kumar Singh, Himanshu Tiku, M. S. Bobji
Summary: The process of evaporation is complex and influenced by diffusion, convection, and heat transfer equations. The rate at which a liquid droplet evaporates from a solid substrate depends on the diffusion rate of vapor. Liquid evaporation is a natural phenomenon that occurs over time if the surrounding medium is not saturated. The size of the droplet is related to time, and the effect of droplet parameters on different substrates can change over time.
Article
Chemistry, Multidisciplinary
Moyosore S. Odunsi, Jeffrey F. Morris, Mark D. Shattuck
Summary: We studied the evolution of capillary bridges between flat plates undergoing compression and stretching cycles. Experimental results showed that the bridge shape is determined by contact angle hysteresis. A model combining contact angle-dependent resistive force and energy minimization accurately captured the bridge shape evolution. The asymmetry in the bridge shape caused by contact angle hysteresis was observed when using nonparallel plates.
Article
Mechanics
D. Ding, J. B. Bostwick
Summary: This study investigates the frequency spectrum of pressure disturbances in drop-on-demand printing applications, which is influenced by the static contact angle and an empirical constant relating the reservoir pressure to volume exchanged. Instabilities in axisymmetric and non-axisymmetric modes are found to be related to center-of-mass motions, and the model parameters affect the spectral degeneracy of the Rayleigh drop modes.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Arnov Paul, Gargi Khurana, Purbarun Dhar
Summary: This article investigates the evaporation kinetics of sessile droplets on curved surfaces, showing that evaporation rates are higher on superhydrophobic surfaces compared to hydrophilic surfaces. By studying the internal flow field and the influence of substrate curvature, a mathematical model is proposed to explain the mechanisms behind these variations. The model predictions align well with experimental observations, confirming the enhanced evaporation rate on curved superhydrophobic surfaces.
Article
Mechanics
Ehud Yariv
Summary: The shape of a sessile drop on a horizontal substrate is determined by the Bond number and the contact angle. For small contact angles, the drop shape can be approximated as a pancake, with capillary forces mainly concentrated near the edge. However, at a specific Bond number, the drop shape transitions to a spherical cap.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Zheng Gong, Zhenpeng Su, Xiaofeng Liu, Di Pan, Jie Liu, Huai Zheng, Sang Woo Joo
Summary: This study demonstrates a method for controlling high-speed droplet transport on lubricated surfaces, with the induced lubrication film flow by charge deposition being the dominating factor. This new method opens a new path for high-performance manipulation of liquid droplets by controlling the lubrication liquid film flow with charge deposition.
Article
Chemistry, Multidisciplinary
Glen McHale, Nan Gao, Gary G. Wells, Hernan Barrio-Zhang, Rodrigo Ledesma-Aguilar
Summary: This study investigates the friction characteristics of liquid on solid surfaces, defines friction coefficients for droplets and contact lines, and analogizes them with Amontons' laws. By utilizing surface free energy considerations, it is found that the frictional force is directly proportional to the surface tension force. These findings have important implications for the design of superhydrophobic surfaces and the control of droplet motion.
Article
Thermodynamics
B. B. Kazemian, P. Cheng
Summary: A variable solid-fluid interaction strength scheme compatible with the lattice Boltzmann method is introduced to investigate contact angle hysteresis phenomena numerically. The method is demonstrated to accurately reproduce the observed behaviors during droplet sliding and evaporation processes, and the results are in agreement with previous experimental investigations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Multidisciplinary
Alexander Saal, Benedikt B. Straub, Hans-Juergen Butt, Ruediger Berger
Summary: This study provides experimental evidence of the influence of defects on surface wetting and proposes a method to calculate the forces acting on a sliding drop on defects. The results show that the calculated forces based on contact line deformation accurately predict the measured forces between defects and water drops, and this relationship holds even for defects of different scales.
Article
Physics, Fluids & Plasmas
Ehud Yariv
Summary: The prevailing diffusion-limited analysis of evaporating sessile droplets is based on a quasisteady model for vapor concentration evolution, but it encounters an issue when applied in two dimensions. This is due to the logarithmic growth of concentration at large distances, which is incompatible with the need for equilibrium concentration at infinity. By recognizing the breakdown of the quasisteady description in the large distance regime, the diffusion problem is resolved using matched asymptotic expansions. This approach provides a self-consistent description of the evaporation process and gives the droplet lifetime as a universal function of a single physical parameter.
Article
Energy & Fuels
Yin Gao, Keliu Wu, Zhangxing Chen, Tong Zhou, Jing Li, Dong Feng, Yanling Gao, Weibing Tian
Summary: This study investigates the impact of wetting hysteresis on fluid flow in shale oil reservoirs by establishing threshold pressure and flow resistance models. The results show that both threshold pressure and flow resistance increase with decreasing pore size, with flow resistance caused by dynamic wetting hysteresis being greater than threshold pressure caused by static wetting hysteresis.
Article
Thermodynamics
Pouya Sharbati, Abdolali K. Sadaghiani, Ali Kosar
Summary: This study investigates the influence of contact angle (CA) and contact angle hysteresis (CAH) on humid air condensation and reveals their different roles in different stages of the condensation cycle. The findings show that increasing CAH has a negative effect on condensation heat transfer, while the impact of changing CA varies. Lower CAH values have a greater impact on enhancing condensation heat transfer, and increasing CAH has a more significant effect on hydrophobic surfaces than on hydrophilic surfaces. Additionally, decreasing CAH has a more pronounced effect on improving condensation heat transfer than increasing CA.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Chemistry, Multidisciplinary
Sakari Lepikko, Ygor Morais Jaques, Muhammad Junaid, Matilda Backholm, Jouko Lahtinen, Jaakko Julin, Ville Jokinen, Timo Sajavaara, Maria Sammalkorpi, Adam S. Foster, Robin H. A. Ras
Summary: This study challenges the traditional assumption of surface heterogeneity as the major factor that affects the motion of liquid droplets on solid surfaces. It reveals a counterintuitive mechanism of slipperiness that is not expected based on the chemical heterogeneity of the surface. This finding opens up new avenues for enhancing the mobility of droplets.
Article
Mechanics
Ehud Yariv, Ory Schnitzer
Summary: We study the problem of calculating the shape of a pancake-like sessile drop at large Bond numbers. By prescribing the drop volume and contact angle, we develop an asymptotic scheme that approximates the height and radius of the drop. The scheme is based on matching two different regions of the drop and utilizing integral relations that represent force balances. The resulting approximations for the pancake parameters are compared with numerical calculations and an asymptotic approximation for the apex curvature is used. We also consider the two-dimensional problem where integral balances determine the pancake parameters in closed form.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Alexa S. Kuenstler, Yuzhen Chen, Phuong Bui, Hyunki Kim, Antonio DeSimone, Lihua Jin, Ryan C. Hayward
ADVANCED MATERIALS
(2020)
Article
Engineering, Biomedical
Sergio Tarantino, Francesco Clemente, Antonio De Simone, Christian Cipriani
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2020)
Article
Materials Science, Multidisciplinary
Alessandro Lucantonio, Antonio DeSimone
MECHANICS OF MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Ilaria Cesini, Magdalena Kowalczyk, Alessandro Lucantonio, Giacomo D'Alesio, Pramod Kumar, Domenico Camboni, Luca Massari, Pasqualantonio Pingue, Antonio De Simone, Alessandro Fraleoni Morgera, Calogero Maria Oddo
Article
Chemistry, Multidisciplinary
Tian Gao, Emmanuel Siefert, Antonio DeSimone, Benoit Roman
ADVANCED MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
V Deshpande, A. DeSimone, R. McMeeking, P. Recho
Summary: This paper introduces a framework that combines an active gel model of cell mechanical scaffold with a complex cell metabolic system to stochastically provide the chemical energy needed for active stress. The study shows that cell shape fluctuations depend on the mechanical environment that constraints the cell.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Multidisciplinary Sciences
D. Riccobelli, G. Noselli, A. DeSimone
Summary: This study investigates the deformations of an elastic beam subjected to an axial force and constrained to slide smoothly along a rigid support, revealing transitions between helical and twisted shapes. The experimental results show good quantitative agreement with the mathematical predictions of the proposed model.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Biology
Giancarlo Cicconofri, Giovanni Noselli, Antonio DeSimone
Summary: The model for flagellar mechanics in Euglena gracilis demonstrates that the peculiar non-planar shapes of its beating flagellum, termed 'spinning lasso', arise from the mechanical interactions between the axoneme and the paraflagellar rod. The complex non-planar configurations of the system are the energetically optimal compromise between the incompatible shapes of the two components.
Article
Multidisciplinary Sciences
D. Agostinelli, G. Noselli, A. DeSimone
Summary: This article discusses the spontaneous oscillations of plant shoots and interprets them as a bifurcation phenomenon in a growing morphoelastic rod. Using numerical simulations, it was found that the characteristic period of these oscillations is robust with respect to changes in the details of the growth model.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Engineering, Biomedical
Outman Akouissi, Stephanie P. Lacour, Silvestro Micera, Antonio DeSimone
Summary: In this study, the mechanical stresses induced on the peripheral nerve by the implant's micromotion were modeled using finite element analysis. The results indicate that the material, geometry, and surface coating of the implant are crucial for its stability and durability. Specifically, implants with smooth edges, materials that are no more than three orders of magnitude stiffer than the nerve, and innovative geometries that redistribute micromotion-associated loads can improve the long-term performance of peripheral nerve implants.
JOURNAL OF NEURAL ENGINEERING
(2022)
Article
Mechanics
Alberto Lolli, Giovanni Corsi, Antonio DeSimone
Summary: This study addresses the navigation problems of a model bio-inspired micro-swimmer swimming at low Reynolds numbers, including predicting velocity and trajectories based on rotation rates, and finding optimal rotation rates to achieve desired translational and rotational velocities. Different designs of propulsive rotors were considered and their relative performance was evaluated.
Article
Biology
ThankGod Echezona Ebenezer, Ross S. Low, Ellis Charles O'Neill, Ishuo Huang, Antonio DeSimone, Scott C. Farrow, Robert A. Field, Michael L. Ginger, Sergio Adrian Guerrero, Michael Hammond, Vladimir Hampl, Geoff Horst, Takahiro Ishikawa, Anna Karnkowska, Eric W. Linton, Peter Myler, Masami Nakazawa, Pierre Cardol, Rosina Sanchez-Thomas, Barry J. Saville, Mahfuzur R. Shah, Alastair G. B. Simpson, Aakash Sur, Kengo Suzuki, Kevin M. Tyler, Paul V. Zimba, Neil Hall, Mark C. Field
Summary: Euglenoids are unicellular flagellates with wide geographical and ecological distribution. They have biotechnological potential and show promise in fields such as biofuels, nutraceuticals, bioremediation, cancer treatments, and robotics design. However, the lack of reference genomes hinders the development of these applications. The Euglena International Network aims to overcome these challenges.
Article
Mathematics
Giovanni Alberti, Annalisa Massaccesi, Eugene Stepanov
Summary: This paper discusses the relationship between surfaces and planes in Euclidean space, as well as the behavior of different types of currents. It is found that integral currents behave similarly to smooth surfaces, while the behavior of normal currents is more diverse and related to the geometric property of their boundaries.
JOURNAL OF DIFFERENTIAL GEOMETRY
(2022)
Article
Chemistry, Physical
Valentina Damioli, Erik Zorzin, Antonio DeSimone, Giovanni Noselli, Alessandro Lucantonio
Summary: This study presents a geometrical model for the transient shaping of thin hydrogel plates based on the theory of non-Euclidean plates. Experimental results show the emergence of non-axisymmetric shapes in the early stages, caused by boundary layer effects induced by solvent transport. The study highlights the limitations of purely geometrical models and emphasizes the importance of transient, reduced theories for accurately controlling the morphing dynamics of active structures.
Article
Physics, Fluids & Plasmas
Nicola Giuliani, Massimiliano Rossi, Giovanni Noselli, Antonio DeSimone
Summary: The study focuses on the nonplanar waveforms generated by the flagellum of Euglena gracilis during swimming, as well as the corresponding three-dimensional flows in the surrounding fluid. By constructing a numerical interpolation of the swimming stroke and comparing it with experimentally measured velocities, the researchers validate the effectiveness of the synthetic stroke. Results show that Euglena behaves as an off-axis puller during swimming strokes, and the flow field can be approximated using a small set of dominant singularities.
