1
|
Fedorets AA, Kolmakov EE, Dombrovsky LA, Nosonovsky M. Inversion of Stabilized Large Droplet Clusters. Langmuir 2024; 40:9993-9998. [PMID: 38688005 DOI: 10.1021/acs.langmuir.4c00138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
We investigate the spontaneous rearrangement of microdroplets in a self-assembled droplet cluster levitating over a thin locally heated water layer. The center-to-periphery droplet diameter ratio (the "inversion coefficient") controls the onset of the inversion. Larger droplets can squeeze between smaller ones due to increased drag force on them from the air-vapor flow. In smaller clusters, the rotation of the droplets plays an important role since larger droplets rotating with the same angular velocity (dependent on the rotor of the airflow field) have higher viscous friction force with the liquid layer. It is desirable to avoid cluster inversion in experiments where individual droplet positions should be traced.
Collapse
Affiliation(s)
- Alexander A Fedorets
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
| | - Eduard E Kolmakov
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
| | - Leonid A Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya St., Moscow 111116, Russia
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
- Mechanical Engineering, University of Wisconsin─Milwaukee, 3200 North Cramer St., Milwaukee, Wisconsin 53211, United States
| |
Collapse
|
2
|
Roy PK, Shoval S, Shvalb N, Dombrovsky LA, Gendelman O, Bormashenko E. Apple-like Shape of Freezing Paraffin Wax Droplets and Its Origin. Materials (Basel) 2023; 16:5514. [PMID: 37629805 PMCID: PMC10456291 DOI: 10.3390/ma16165514] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 08/03/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023]
Abstract
Paraffin wax stores energy in the form of latent heat at a nearly constant temperature during melting and releases this energy during solidification. This effect is used in industrial energy storage. At the same time, the possible deformation of even small volumes of material as a result of phase change is insufficiently studied. In this paper, the physical nature of such deformation, probably for the first time, is studied on the example of a droplet of paraffin wax. An unusual change in the shape of a melted droplet of paraffin wax placed on a relatively cold glass plate was observed in the laboratory experiments. As the droplet solidifies, its upper surface becomes nearly flat, and a dimple is formed in the center of this surface, making the droplet look like a fruit (pumpkins are more commonly shaped like this, but the authors prefer apples). A series of experiments, as well as physical and numerical modeling of the droplet's thermal state, taking into account the formation of a mushy zone between liquidus and solidus, made it possible to understand the role of gravity and gradual increase in viscosity and density of paraffin wax on changing the droplet shape and, in particular, to clarify the mechanism of formation of the dimple on its upper. It was shown that the mushy zone between the liquidus and solidus of the paraffin wax is responsible for the dimple formation.
Collapse
Affiliation(s)
- Pritam Kumar Roy
- Chemical Engineering Department, Engineering Faculty, Ariel University, P.O. Box 3, Ariel 407000, Israel; (P.K.R.); (L.A.D.)
| | - Shraga Shoval
- Department of Industrial Engineering and Management, Engineering Faculty, Ariel University, P.O. Box 3, Ariel 407000, Israel
| | - Nir Shvalb
- Department of Mechanical Engineering & Mechatronics, Faculty of Engineering, Ariel University, P.O. Box 3, Ariel 407000, Israel
| | - Leonid A. Dombrovsky
- Chemical Engineering Department, Engineering Faculty, Ariel University, P.O. Box 3, Ariel 407000, Israel; (P.K.R.); (L.A.D.)
- Heat Transfer Department, Joint Institute for High Temperatures, Moscow 111116, Russia
- X-BIO Institute, University of Tyumen, Tyumen 625003, Russia
| | - Oleg Gendelman
- Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel
| | - Edward Bormashenko
- Chemical Engineering Department, Engineering Faculty, Ariel University, P.O. Box 3, Ariel 407000, Israel; (P.K.R.); (L.A.D.)
| |
Collapse
|
3
|
Fedorets AA, Kolmakov EE, Medvedev DN, Nosonovsky M, Dombrovsky LA. Fluorescence profiles of water droplets in stable levitating droplet clusters. Phys Chem Chem Phys 2023; 25:15000-15007. [PMID: 37211824 DOI: 10.1039/d3cp00542a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Clusters of nearly identical water microdroplets levitating over a locally heated water layer are considered. The high-resolution and high-speed fluorescence microscopy showed that there is a universal brightness profile of single droplets, and this profile does not depend on the droplet temperature and size. We explain this universal profile using the theory of light scattering and propose a new method for determining the parameters of possible optical inhomogeneity of a droplet from its fluorescent image. In particular, we report for the first time and explain the anomalous fluorescence of some large droplets with initially high brightness at the periphery of the droplet. The disappearance of this effect after a few seconds is related to the diffusion of the fluorescent substance in water. Understanding the fluorescence profiles paves the way for the application of droplet clusters to the laboratory study of biochemical processes in individual microdroplets.
Collapse
Affiliation(s)
- Alexander A Fedorets
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, Tyumen, 625003, Russia.
| | - Eduard E Kolmakov
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, Tyumen, 625003, Russia.
| | - Dmitry N Medvedev
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, Tyumen, 625003, Russia.
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, Tyumen, 625003, Russia.
- University of Wisconsin-Milwaukee, 3200 N Cramer St., Milwaukee, WI 53211, USA.
| | - Leonid A Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, Tyumen, 625003, Russia.
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya St., Moscow, 111116, Russia.
| |
Collapse
|
4
|
Kumar Roy P, Binks BP, Shoval S, Dombrovsky LA, Bormashenko E. Hierarchical liquid marbles formed using floating hydrophobic powder and levitating water droplets. J Colloid Interface Sci 2022; 626:466-474. [DOI: 10.1016/j.jcis.2022.06.168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/27/2022] [Accepted: 06/28/2022] [Indexed: 10/31/2022]
|
5
|
Roy PK, Binks BP, Shoval S, Dombrovsky LA, Bormashenko E. Levitating clusters of fluorinated fumed silica nanoparticles enable manufacture of liquid marbles: Co-occurrence of interfacial, thermal and electrostatic events. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
6
|
Frenkel M, Fedorets AA, Shcherbakov DV, Dombrovsky LA, Nosonovsky M, Bormashenko E. Branched droplet clusters and the Kramers theorem. Phys Rev E 2022; 105:055104. [PMID: 35706306 DOI: 10.1103/physreve.105.055104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 04/17/2022] [Indexed: 06/15/2023]
Abstract
Scaling laws inherent for polymer molecules are checked for the linear and branched chains constituting two-dimensional (2D) levitating microdroplet clusters condensed above the locally heated layer of water. We demonstrate that the dimensionless averaged end-to-end distance of the droplet chain r[over ¯] normalized by the averaged distance between centers of the adjacent droplets l[over ¯] scales as r[over ¯]/l[over ¯]∼n^{0.76}, where n is the number of links in the chain, which is close to the power exponent ¾, predicted for 2D polymer chains with excluded volume in the dilution limit. The values of the dimensionless Kuhn length b[over ̃]≅2.12±0.015 and of the averaged absolute value of the bond angle of the droplet chains |θ|[over ¯]=22.0±0.5^{0} are determined. Using these values we demonstrate that the predictions of the Kramers theorem for the gyration radius of branched polymers are valid also for the branched droplets' chains. We discuss physical interactions that explain both the high value of the power exponent and the applicability of the Kramers theorem including the effects of the excluded volume, surrounding droplet monomers, and the prohibition of extreme values of the bond angle.
Collapse
Affiliation(s)
- Mark Frenkel
- Department of Chemical Engineering, Engineering Faculty, Ariel University, Ariel 407000
| | - Alexander A Fedorets
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
| | - Dmitry V Shcherbakov
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
| | - Leonid A Dombrovsky
- Department of Chemical Engineering, Engineering Faculty, Ariel University, Ariel 407000
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya St., Moscow 111116, Russia
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
- Mechanical Engineering, University of Wisconsin-Milwaukee, 3200 North Cramer St., Milwaukee, Wisconsin 53211, USA
| | - Edward Bormashenko
- Department of Chemical Engineering, Engineering Faculty, Ariel University, Ariel 407000
| |
Collapse
|
7
|
Roy PK, Legchenkova I, Dombrovsky LA, Yu. Levashov V, Binks BP, Shvalb N, Shoval S, Valtsifer V, Bormashenko E. Thermophoretic levitation of solid particles at atmospheric pressure. ADV POWDER TECHNOL 2022. [DOI: 10.1016/j.apt.2022.103497] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
8
|
Kumar Roy P, Legchenkova I, Shoval S, Dombrovsky LA, Bormashenko E. Osmotic evolution of composite liquid marbles. J Colloid Interface Sci 2021; 592:167-173. [PMID: 33662822 DOI: 10.1016/j.jcis.2021.02.055] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/07/2021] [Accepted: 02/12/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS We hypothesized that the reported evolution (growth) of composite water marbles filled with saline water and coated with lycopodium dispersed in a thin layer of silicone oil is due to the osmotic mass transfer. The hypothesis is supported by the semi-empirical model of osmotic growth of small liquid marbles floating on distilled water. EXPERIMENTS Saline composite, silicone oil-coated marbles floating on distilled water grew with time; whereas, composite marbles filled with distilled water floating on aqueous solutions of NaCl lost mass with time and shrunk. However, composite liquid marbles filled with saline water and floating on aqueous solutions of NaCl remained stable during 25 h of the laboratory experiment. FINDINGS The reported findings are reasonably attributed to osmotic mass transport through the thin silicon layer filled with lycopodium particles coating the marbles, acting as an osmotic membrane. This is supported by the suggested model for the osmotic growth of marbles.
Collapse
Affiliation(s)
- Pritam Kumar Roy
- Chemical Engineering Department, Faculty of Engineering, Ariel University, P.O.B. 3, 407000 Ariel, Israel
| | - Irina Legchenkova
- Chemical Engineering Department, Faculty of Engineering, Ariel University, P.O.B. 3, 407000 Ariel, Israel
| | - Shraga Shoval
- Department of Industrial Engineering and Management, Faculty of Engineering, Ariel University, P.O.B. 3, 407000 Ariel, Israel
| | - Leonid A Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, Tyumen 625003, Russia; Heat Transfer Department, Joint Institute for High Temperatures, 17A Krasnokazarmennaya St, Moscow 111116, Russia
| | - Edward Bormashenko
- Chemical Engineering Department, Faculty of Engineering, Ariel University, P.O.B. 3, 407000 Ariel, Israel.
| |
Collapse
|
9
|
Bormashenko E, Fedorets AA, Dombrovsky LA, Nosonovsky M. Survival of Virus Particles in Water Droplets: Hydrophobic Forces and Landauer's Principle. Entropy (Basel) 2021; 23:e23020181. [PMID: 33573357 PMCID: PMC7912349 DOI: 10.3390/e23020181] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 01/21/2021] [Accepted: 01/28/2021] [Indexed: 11/16/2022]
Abstract
Many small biological objects, such as viruses, survive in a water environment and cannot remain active in dry air without condensation of water vapor. From a physical point of view, these objects belong to the mesoscale, where small thermal fluctuations with the characteristic kinetic energy of kBT (where kB is the Boltzmann’s constant and T is the absolute temperature) play a significant role. The self-assembly of viruses, including protein folding and the formation of a protein capsid and lipid bilayer membrane, is controlled by hydrophobic forces (i.e., the repulsing forces between hydrophobic particles and regions of molecules) in a water environment. Hydrophobic forces are entropic, and they are driven by a system’s tendency to attain the maximum disordered state. On the other hand, in information systems, entropic forces are responsible for erasing information, if the energy barrier between two states of a switch is on the order of kBT, which is referred to as Landauer’s principle. We treated hydrophobic interactions responsible for the self-assembly of viruses as an information-processing mechanism. We further showed a similarity of these submicron-scale processes with the self-assembly in colloidal crystals, droplet clusters, and liquid marbles.
Collapse
Affiliation(s)
- Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Science Faculty, Ariel University, Ariel 40700, Israel;
| | - Alexander A. Fedorets
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, 625003 Tyumen, Russia; (A.A.F.); (L.A.D.)
| | - Leonid A. Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, 625003 Tyumen, Russia; (A.A.F.); (L.A.D.)
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya St, 111116 Moscow, Russia
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St, 625003 Tyumen, Russia; (A.A.F.); (L.A.D.)
- Department of Mechanical Engineering, University of Wisconsin–Milwaukee, 3200 North Cramer St, Milwaukee, WI 53211, USA
- Correspondence: ; Tel.: +1-414-229-2816
| |
Collapse
|
10
|
Fedorets AA, Shcherbakov DV, Dombrovsky LA, Bormashenko E, Nosonovsky M. Impact of Surfactants on the Formation and Properties of Droplet Clusters. Langmuir 2020; 36:11154-11160. [PMID: 32872782 DOI: 10.1021/acs.langmuir.0c02241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A levitating cluster of condensed microdroplets can form over the heated area of a water layer. The thermocapillary (TC) flow at the surface of the water layer combined with the convective flow in the layer often prevents a cluster's stability due to disturbances that it creates in the gas flow over the water surface. The TC flow can be suppressed by introducing small amounts of surfactants into the water layer. We conduct a systematic study of the effect of a surfactant on the cluster. We show experimentally that the introduction of the surfactant sodium laureth sulfate with concentrations of 0.05-0.5 g/L can suppress the TC convection. It is shown that the amount of surfactant does not affect the condensational growth of droplets and the structure of the cluster. In the absence of the surfactant, a ring-shaped cluster is formed, which is reported in this paper for the first time.
Collapse
Affiliation(s)
- Alexander A Fedorets
- X-BIO Institute, University of Tyumen, 6 Volodarskogo Street, Tyumen 625003, Russia
| | - Dmitry V Shcherbakov
- X-BIO Institute, University of Tyumen, 6 Volodarskogo Street, Tyumen 625003, Russia
| | - Leonid A Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo Street, Tyumen 625003, Russia
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya Street, Moscow 111116, Russia
| | - Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Science Faculty, Ariel University, Ariel 40700, Israel
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo Street, Tyumen 625003, Russia
- Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Cramer Street, Milwaukee, Wisconsin 53211, United States
| |
Collapse
|
11
|
Abstract
Self-assembled clusters of condensed water microdroplets can levitate over a locally heated layer of water. Large clusters form hexagonally ordered (honeycomb) structures similar to colloidal crystals, while small (from one to several dozens of droplets) clusters possess special symmetry properties. Small clusters may demonstrate 4-fold, 5-fold, and 7-fold symmetry which is absent from large clusters and crystals. The symmetry properties of small cluster configurations are universal, i.e., they do not depend on the size of the droplets and details of the interactions between the droplets. The small cluster configurations may be compared with other types of symmetric objects in geometry.
Collapse
Affiliation(s)
- Alexander A Fedorets
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen, 625003, Russia.
| | - Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Science Faculty, Ariel University, Ariel, 40700, Israel.
| | - Leonid A Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen, 625003, Russia. and Joint Institute for High Temperatures, 17A Krasnokazarmennaya St., Moscow, 111116, Russia.
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen, 625003, Russia. and Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 3200 North Cramer St., Milwaukee, WI 53211, USA.
| |
Collapse
|
12
|
Bormashenko E, Fedorets AA, Frenkel M, Dombrovsky LA, Nosonovsky M. Clustering and self-organization in small-scale natural and artificial systems. Philos Trans A Math Phys Eng Sci 2020; 378:20190443. [PMID: 32008448 PMCID: PMC7015285 DOI: 10.1098/rsta.2019.0443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/18/2019] [Indexed: 05/17/2023]
Abstract
Physical properties of clusters, i.e. systems composed of a 'small' number of particles, are qualitatively different from those of infinite systems. The general approach to the problem of clustering is suggested. Clusters, as they are seen in the graphs theory, are discussed. Various physical mechanisms of clustering are reviewed. Dimensional properties of clusters are addressed. The dimensionality of clusters governs to a great extent their properties. Weakly and strongly coupled clusters are discussed. Hydrodynamic and capillary interactions giving rise to clusters formation are surveyed. Levitating droplet clusters, turbulent clusters and droplet clusters responsible for the breath-figures self-assembly are considered. Entropy factors influencing clustering are considered. Clustering in biological systems results in non-equilibrium multi-scale assembly, where at each scale, self-driven components come together by consuming energy in order to form the hierarchical structure. This article is part of the theme issue 'Bioinspired materials and surfaces for green science and technology (part 3)'.
Collapse
Affiliation(s)
- Edward Bormashenko
- Department of Chemical Engineering, Engineering Sciences Faculty, Ariel University, Ariel 40700, Israel
| | | | - Mark Frenkel
- Department of Chemical Engineering, Engineering Sciences Faculty, Ariel University, Ariel 40700, Israel
| | - Leonid A. Dombrovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo Street, Tyumen 625003, Russia
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya Street, Moscow 111116, Russia
| | - Michael Nosonovsky
- X-BIO Institute, University of Tyumen, 6 Volodarskogo Street, Tyumen 625003, Russia
- Department of Mechanical Engineering, University of Wisconsin–Milwaukee, 3200 North Cramer Street, Milwaukee, WI 53211, USA
| |
Collapse
|
13
|
Fedorets AA, Frenkel M, Legchenkova I, Shcherbakov DV, Dombrovsky LA, Nosonovsky M, Bormashenko E. Self-Arranged Levitating Droplet Clusters: A Reversible Transition from Hexagonal to Chain Structure. Langmuir 2019; 35:15330-15334. [PMID: 31663755 DOI: 10.1021/acs.langmuir.9b03135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Water microdroplets condense over locally heated water-vapor interfaces and levitate in an ascending vapor-air flow forming self-assembled ordered monolayer clusters. The droplets do not coalesce due to complex aerodynamic interactions between them. The droplet cluster formation is governed by the condensation/evaporation balance and by coupling of heat flux and vapor flow with aerodynamic forces. Here, we report the observations of a reversible structural transition from the ordered hexagonal-structure cluster to the chain-like structure and provide an explanation of its mechanism and conditions under which the transition occurs. The phenomenon provides new insights on the fundamental physical and chemical processes with microdroplets including their role in reaction catalysis in nature and their potential for aerosol and microfluidic applications.
Collapse
Affiliation(s)
| | - Mark Frenkel
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty , Ariel University , Ariel 407000 , Israel
| | - Irina Legchenkova
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty , Ariel University , Ariel 407000 , Israel
| | | | - Leonid A Dombrovsky
- University of Tyumen , 6 Volodarskogo St. , Tyumen 625003 , Russia
- Joint Institute for High Temperatures , 17A Krasnokazarmennaya St. , Moscow 111116 , Russia
| | - Michael Nosonovsky
- University of Tyumen , 6 Volodarskogo St. , Tyumen 625003 , Russia
- Mechanical Engineering , University of Wisconsin-Milwaukee , 3200 North Cramer St. , Milwaukee , Wisconsin 53211 , United States
| | - Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty , Ariel University , Ariel 407000 , Israel
| |
Collapse
|
14
|
Fedorets AA, Bormashenko E, Dombrovsky LA, Nosonovsky M. Droplet clusters: nature-inspired biological reactors and aerosols. Philos Trans A Math Phys Eng Sci 2019; 377:20190121. [PMID: 31177958 PMCID: PMC6562358 DOI: 10.1098/rsta.2019.0121] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Condensed microdroplets play a prominent role in living nature, participating in various phenomena, from water harvesting by plants and insects to microorganism migration in bioaerosols. Microdroplets may also form regular self-organized patterns, such as the hexagonally ordered breath figures on a solid surface or levitating monolayer droplet clusters over a locally heated water layer. While the breath figures have been studied since the nineteenth century, they have found a recent application in polymer surface micropatterning (e.g. for superhydrophobicity). Droplet clusters were discovered in 2004, and they are the subject of active research. Methods to control and stabilize droplet clusters make them suitable for the in situ analysis of bioaerosols. Studying life in bioaerosols is important for understanding microorganism origins and migration; however, direct observation with traditional methods has not been possible. We report preliminary results on direct in situ observation of microorganisms in droplet clusters. We also present a newly observed transition between the hexagonally ordered and chain-like states of a droplet cluster. This article is part of the theme issue 'Bioinspired materials and surfaces for green science and technology (part 2)'.
Collapse
Affiliation(s)
| | - Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Science Faculty, Ariel University, Ariel 40700, Israel
| | - Leonid A. Dombrovsky
- University of Tyumen, 6 Volodarskogo St, Tyumen 625003, Russia
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya St, Moscow 111116, Russia
| | - Michael Nosonovsky
- University of Tyumen, 6 Volodarskogo St, Tyumen 625003, Russia
- Department of Mechanical Engineering, University of Wisconsin–Milwaukee, 3200 North Cramer St, Milwaukee, WI 53211, USA
- e-mail:
| |
Collapse
|
15
|
Bormashenko E, Frenkel M, Vilk A, Legchenkova I, Fedorets AA, Aktaev NE, Dombrovsky LA, Nosonovsky M. Characterization of Self-Assembled 2D Patterns with Voronoi Entropy. Entropy (Basel) 2018; 20:e20120956. [PMID: 33266680 PMCID: PMC7512542 DOI: 10.3390/e20120956] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 12/05/2018] [Accepted: 12/10/2018] [Indexed: 11/16/2022]
Abstract
The Voronoi entropy is a mathematical tool for quantitative characterization of the orderliness of points distributed on a surface. The tool is useful to study various surface self-assembly processes. We provide the historical background, from Kepler and Descartes to our days, and discuss topological properties of the Voronoi tessellation, upon which the entropy concept is based, and its scaling properties, known as the Lewis and Aboav–Weaire laws. The Voronoi entropy has been successfully applied to recently discovered self-assembled structures, such as patterned microporous polymer surfaces obtained by the breath figure method and levitating ordered water microdroplet clusters.
Collapse
Affiliation(s)
- Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty, Ariel University, Ariel 407000, Israel
- Correspondence: ; Tel.: +972-074-729-68-63
| | - Mark Frenkel
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty, Ariel University, Ariel 407000, Israel
| | - Alla Vilk
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty, Ariel University, Ariel 407000, Israel
| | - Irina Legchenkova
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty, Ariel University, Ariel 407000, Israel
| | | | | | - Leonid A. Dombrovsky
- University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
- Joint Institute for High Temperatures, 17A Krasnokazarmennaya St., Moscow 111116, Russia
| | - Michael Nosonovsky
- University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia
- Mechanical Engineering, University of Wisconsin—Milwaukee, 3200 North Cramer St., Milwaukee, WI 53211, USA
| |
Collapse
|
16
|
Hakoume D, Dombrovsky LA, Delaunay D, Rousseau B. Spectroscopic diagnostics of morphological changes arising in thermal processing of polypropylene. Appl Opt 2014; 53:2702-2710. [PMID: 24787599 DOI: 10.1364/ao.53.002702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 03/24/2014] [Indexed: 06/03/2023]
Abstract
Polypropylene is considered as a representative thermoplastic matrix for advanced composite materials that have some advantages in various engineering applications. Wide-range infrared optical properties of polypropylene are important for combined heat transfer modeling in these composite materials, which are semitransparent in a considerable part of the whole spectral range. This study is focused on optical properties of polypropylene in the visible and near-infrared ranges because the measurements in these ranges exhibit a stronger effect of the processing temperature used in the material manufacturing. The experimental study is based on spectral measurements of both the normal-hemispherical reflectance and transmittance of polypropylene samples. The main characteristics of volumetric absorption and scattering are identified using the inverse problem solution based on the modified two-flux approximation, which is sufficiently accurate to determine the hemispherical characteristics of the radiation field in the range of the problem parameters. In particular, the effect of a relatively strong scattering is observed at the absorption peaks in the near-infrared range. An approximate theoretical model based on spectroscopic data is developed to estimate morphological changes arising in thermal processing of polypropylene at different temperatures.
Collapse
|
17
|
Hewakuruppu YL, Dombrovsky LA, Chen C, Timchenko V, Jiang X, Baek S, Taylor RA. Plasmonic "pump-probe" method to study semi-transparent nanofluids. Appl Opt 2013; 52:6041-6050. [PMID: 24085009 DOI: 10.1364/ao.52.006041] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 07/29/2013] [Indexed: 06/02/2023]
Abstract
Nanofluids have been increasingly used in a wide range of thermal applications. Although these applications can benefit greatly from investigating the behavior of nanoparticles under different heating scenarios, there is a lack of experiments that can achieve this. To overcome this challenge, an optical "pump-probe"-type experiment is suggested in this paper. In experiments of this type, a set of "pumping" nanoparticles are specifically selected to absorb laser radiation. These particles represent a flexible tool for volumetric heating. A second set of "probing" nanoparticles can be tailored to scatter a separate optical probing signal. This work presents a selection procedure for nanoparticles of both types. The selection procedure is then demonstrated for a specific example where the pump and probe wavelengths are of 980 and 532 nm, respectively. Gold nanorods with diameters of 10 and a length of 58 nm are selected as the "most suitable" absorbing particles, while silver nanospheres with a diameter of 110 nm are selected as the "most suitable" scattering particles. These particles are synthesized and shown to experimentally match the desired optical properties. Overall, this paper proposes and demonstrates an approach by which it is possible to design and fabricate particles for a wide range of optical studies in semi-transparent nanofluids.
Collapse
|
18
|
Lipinski W, Dombrovsky LA. TEMPERATURE AND THERMAL STRESS PROFILES IN SEMI-TRANSPARENT PARTICLES HEATED BY CONCENTRATED SOLAR RADIATION. Radiation 2006. [DOI: 10.1615/ihtc13.p4.20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
19
|
Dombrovsky LA, Randrianalisoa J, Baillis D. INFRARED RADIATIVE PROPERTIES OF POLYMER COATING CONTAINING HOLLOW MICROSPHERES. Radiation 2006. [DOI: 10.1615/ihtc13.p4.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|