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Li W, Zhang C, Wang Y. Evaporative self-assembly in colloidal droplets: Emergence of ordered structures from complex fluids. Adv Colloid Interface Sci 2024; 333:103286. [PMID: 39232473 DOI: 10.1016/j.cis.2024.103286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 07/14/2024] [Accepted: 08/26/2024] [Indexed: 09/06/2024]
Abstract
Colloidal droplet evaporation is an intriguing and intricate phenomenon that has captured the interest of scientists across diverse disciplines, including physical chemistry, fluid dynamics, and soft matter science, over the past two decades. Despite being a non-equilibrium system with inherent challenges posed by coffee ring formation and Marangoni effects, which hinder the precise control of deposition patterns, evaporative self-assembly presents a convenient and cost-effective approach for generating arrays of well-ordered structures and functional patterns with wide-ranging applications in inkjet printing, photonic crystals, and biochemical assays. In the realm of printed electronics and photonics, effectively mitigating coffee rings while achieving uniformity and orderliness has emerged as a critical factor in realising the next generation of large-area, low-cost, flexible devices that are exceptionally sensitive and high-performance. This review highlights the evaporative self-assembly process in colloidal droplets with a focus on the intricate mechanical environment, self-assembly at diverse interfaces, and potential applications of these assembling ordered structures.
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Affiliation(s)
- Weibin Li
- National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, 100049 Beijing, China.
| | - Chen Zhang
- National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Yuren Wang
- National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, 100049 Beijing, China
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2
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Kong ZM, Sandhu HS, Qiu L, Wu J, Tian WJ, Chi XJ, Tao Z, Yang CFJ, Wang XJ. Virus Dynamics and Decay in Evaporating Human Saliva Droplets on Fomites. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:17737-17750. [PMID: 35904357 DOI: 10.1021/acs.est.2c02311] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The transmission of most respiratory pathogens, including SARS-CoV-2, occurs via virus-containing respiratory droplets, and thus, factors that affect virus viability in droplet residues on surfaces are of critical medical and public health importance. Relative humidity (RH) is known to play a role in virus survival, with a U-shaped relationship between RH and virus viability. The mechanisms affecting virus viability in droplet residues, however, are unclear. This study examines the structure and evaporation dynamics of virus-containing saliva droplets on fomites and their impact on virus viability using four model viruses: vesicular stomatitis virus, herpes simplex virus 1, Newcastle disease virus, and coronavirus HCoV-OC43. The results support the hypothesis that the direct contact of antiviral proteins and virions within the "coffee ring" region of the droplet residue gives rise to the observed U-shaped relationship between virus viability and RH. Viruses survive much better at low and high RH, and their viability is substantially reduced at intermediate RH. A phenomenological theory explaining this phenomenon and a quantitative model analyzing and correlating the experimentally measured virus survivability are developed on the basis of the observations. The mechanisms by which RH affects virus viability are explored. At intermediate RH, antiviral proteins have optimal influence on virions because of their largest contact time and overlap area, which leads to the lowest level of virus activity.
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Affiliation(s)
- Zi-Meng Kong
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Harpal Singh Sandhu
- Department of Ophthalmology and Visual Sciences, School of Medicine, University of Louisville, Louisville, Kentucky 40202, United States
- Department of Bioengineering, J.B. Speed School of Engineering, University of Louisville, Louisville, Kentucky 40292, United States
| | - Lu Qiu
- School of Energy and Power Engineering, Beihang University, Beijing 100191, China
| | - Jicheng Wu
- School of Energy and Power Engineering, Beihang University, Beijing 100191, China
| | - Wen-Jun Tian
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Xiao-Jing Chi
- Institute of Pathogen Biology, Chinese Academy of Medical Sciences, Beijing 100005, China
| | - Zhi Tao
- School of Energy and Power Engineering, Beihang University, Beijing 100191, China
| | - Chi-Fu Jeffrey Yang
- Department of Surgery, Harvard Medical School, Boston, Massachusetts 02215, United States
| | - Xiao-Jia Wang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
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3
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Cui J, Wang T, Che Z. Melting Process of Frozen Sessile Droplets on Superhydrophobic Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:14800-14810. [PMID: 37797346 DOI: 10.1021/acs.langmuir.3c02318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Superhydrophobic surfaces can exhibit icephobicity in many ways due to their large contact angles and small rolling angles. The melting process of frozen droplets on superhydrophobic surfaces is still unclear, hindering the understanding of surface icephobicity. In this experimental study of the melting process of frozen sessile droplets on superhydrophobic surfaces, we find two types of melting morphologies with opposite vortex directions on a single-scale nanostructured (SN) superhydrophobic substrate and a hierarchical-scale micronanostructured (HMN) superhydrophobic substrate. Melting pattern visualizations and flow field measurements showed Marangoni convection and natural convection occurring in the melting sessile droplets. For the HMN superhydrophobic substrate, the internal flow was found to be dominated by Marangoni convection due to the temperature gradient along the surface of the droplet. For the SN superhydrophobic substrate, Marangoni convection was inhibited by the superhydrophobic particles at the surface of the droplet, which were shed from the fragile superhydrophobic substrate during the freezing-melting process, as confirmed by surface characterizations of the substrate and flow measurements of a water pool. These results will help researchers better understand the melting process of frozen droplets and in designing novel icephobic surfaces for numerous applications.
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Affiliation(s)
- Jiawang Cui
- State Key Laboratory of Engines, Tianjin University, Tianjin 300350, China
| | - Tianyou Wang
- State Key Laboratory of Engines, Tianjin University, Tianjin 300350, China
- National Industry-Education Platform of Energy Storage, Tianjin University, Tianjin 300350, China
| | - Zhizhao Che
- State Key Laboratory of Engines, Tianjin University, Tianjin 300350, China
- National Industry-Education Platform of Energy Storage, Tianjin University, Tianjin 300350, China
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4
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Howard NS, Archer AJ, Sibley DN, Southee DJ, Wijayantha KGU. Surfactant Control of Coffee Ring Formation in Carbon Nanotube Suspensions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:929-941. [PMID: 36607610 PMCID: PMC9878724 DOI: 10.1021/acs.langmuir.2c01691] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 12/06/2022] [Indexed: 06/17/2023]
Abstract
The coffee ring effect regularly occurs during the evaporation of colloidal droplets and is often undesirable. Here we show that adding a specific concentration of a surfactant can mitigate this effect. We have conducted experiments on aqueous suspensions of carbon nanotubes that were prepared with cationic surfactant dodecyltrimethylammonium bromide added at 0.2, 0.5, 1, 2, 5, and 10 times the critical micelle concentration. Colloidal droplets were deposited on candidate substrates for printed electronics with varying wetting characteristics: glass, polyethylene terephthalate, fluoroethylene propylene copolymer, and polydimethylsiloxane. Following drying, four pattern types were observed in the final deposits: dot-like, uniform, coffee ring deposits, and combined patterns (coffee ring with a dot-like central deposit). Evaporation occurred predominantly in constant contact radius mode for most pattern types, except for some cases that led to uniform deposits in which early stage receding of the contact line occurred. Image analysis and profilometry yielded deposit thicknesses, allowing us to identify a coffee ring subfeature in all uniform deposits and to infer the percentage coverage in all cases. Importantly, a critical surfactant concentration was identified for the generation of highly uniform deposits across all substrates. This concentration resulted in visually uniform deposits consisting of a coffee ring subfeature with a densely packed center, generated from two distinct evaporative phases.
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Affiliation(s)
- N. S. Howard
- Department
of Chemistry, Loughborough University, Loughborough LE11 3TU, U.K.
| | - A. J. Archer
- Department
of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, U.K.
- Interdisciplinary
Centre for Mathematical Modelling, Loughborough
University, Loughborough LE11 3TU, U.K.
| | - D. N. Sibley
- Department
of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, U.K.
- Interdisciplinary
Centre for Mathematical Modelling, Loughborough
University, Loughborough LE11 3TU, U.K.
| | - D. J. Southee
- School
of Design and Creative Arts, Loughborough
University, Loughborough LE11 3TU, U.K.
| | - K. G. U. Wijayantha
- Department
of Chemistry, Loughborough University, Loughborough LE11 3TU, U.K.
- Centre
for Renewable and Low Carbon Energy, Cranfield
University, Cranfield, Bedfordshire MK43 0AL, U.K.
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5
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Thayyil Raju L, Diddens C, Li Y, Marin A, van der Linden MN, Zhang X, Lohse D. Evaporation of a Sessile Colloidal Water-Glycerol Droplet: Marangoni Ring Formation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:12082-12094. [PMID: 36094143 PMCID: PMC9536018 DOI: 10.1021/acs.langmuir.2c01949] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/30/2022] [Indexed: 06/15/2023]
Abstract
The transport and aggregation of particles in suspensions is an important process in many physicochemical and industrial processes. In this work, we study the transport of particles in an evaporating binary droplet. Surprisingly, the accumulation of particles occurs not only at the contact line (due to the coffee-stain effect) or at the solid substrate (due to sedimentation) but also at a particular radial position near the liquid-air interface, forming a "ring", which we term as the Marangoni ring. The formation of this ring is primarily attributed to the solutal Marangoni flow triggered by the evaporation dynamics of the water-glycerol droplet. Experiments and simulations show fair agreement in the volume evolution and the general structure of the solutal Marangoni flow, that is, the Marangoni vortex. Experiments show that the location of the Marangoni ring is strongly correlated with the Marangoni vortex. However, finite element numerical simulations fail to describe the particle distribution seen in the experiments. Interestingly, the particles not only accumulate to form the Marangoni ring but also assemble as colloidal crystals close to the liquid-air interface, yielding iridescence. The formation of the colloidal crystals in the experiments is strong evidence that non-hydrodynamic interactions, which are not represented in the simulations, also play a significant role in our system.
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Affiliation(s)
- Lijun Thayyil Raju
- Physics
of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
| | - Christian Diddens
- Physics
of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
| | - Yaxing Li
- Institute
of Fluid Dynamics, Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland
| | - Alvaro Marin
- Physics
of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
| | - Marjolein N. van der Linden
- Physics
of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
- Canon
Production Printing Netherlands B.V., 5900 MA Venlo, The Netherlands
| | - Xuehua Zhang
- Physics
of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
- Department
of Chemical and Materials Engineering, University
of Alberta, T6G 1H9 Edmonton, Alberta, Canada
| | - Detlef Lohse
- Physics
of Fluids Group, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands
- Max
Planck Institute for Dynamics and Self-Organisation, 37077 Göttingen, Germany
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6
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Giannitelli SM, Limiti E, Mozetic P, Pinelli F, Han X, Abbruzzese F, Basoli F, Del Rio D, Scialla S, Rossi F, Trombetta M, Rosanò L, Gigli G, Zhang ZJ, Mauri E, Rainer A. Droplet-based microfluidic synthesis of nanogels for controlled drug delivery: tailoring nanomaterial properties via pneumatically actuated flow-focusing junction. NANOSCALE 2022; 14:11415-11428. [PMID: 35903969 DOI: 10.1039/d2nr00827k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Conventional batch syntheses of polymer-based nanoparticles show considerable shortcomings in terms of scarce control over nanomaterials morphology and limited lot-to-lot reproducibility. Droplet-based microfluidics represents a valuable strategy to overcome these constraints, exploiting the formation of nanoparticles within discrete microdroplets. In this work, we synthesized nanogels (NGs) composed of hyaluronic acid and polyethyleneimine using a microfluidic flow-focusing device endowed with a pressure-driven micro-actuator. The actuator achieves real-time modulation of the junction orifice width, thereby regulating the microdroplet diameter and, as a result, the NG size. Acting on process parameters, NG hydrodynamic diameter could be tuned in the range 92-190 nm while preserving an extremely low polydispersity (0.015); those values are hardly achievable in batch syntheses and underline the strength of our toolbox for the continuous in-flow synthesis of nanocarriers. Furthermore, NGs were validated in vitro as a drug delivery system in a representative case study still lacking an effective therapeutic treatment: ovarian cancer. Using doxorubicin as a chemotherapeutic agent, we show that NG-mediated release of the drug results in an enhanced antiblastic effect vs. the non-encapsulated administration route even at sublethal dosages, highlighting the wide applicability of our microfluidics-enabled nanomaterials in healthcare scenarios.
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Affiliation(s)
- Sara Maria Giannitelli
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
| | - Emanuele Limiti
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
| | - Pamela Mozetic
- Division of Neuroscience, Institute of Experimental Neurology, San Raffaele Scientific Institute, Via Olgettina, 60, 20132, Milan, Italy
- Institute of Nanotechnology (NANOTEC), National Research Council, via Monteroni, 73100, Lecce, Italy
| | - Filippo Pinelli
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, via L. Mancinelli 7, 20131 Milan, Italy
| | - Xiaoyu Han
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Franca Abbruzzese
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
| | - Francesco Basoli
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
| | - Danila Del Rio
- Institute of Molecular Biology and Pathology, National Research Council (CNR), via Degli Apuli 4, 00185 Rome, Italy
| | - Stefano Scialla
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
| | - Filippo Rossi
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, via L. Mancinelli 7, 20131 Milan, Italy
| | - Marcella Trombetta
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
| | - Laura Rosanò
- Institute of Molecular Biology and Pathology, National Research Council (CNR), via Degli Apuli 4, 00185 Rome, Italy
| | - Giuseppe Gigli
- Institute of Nanotechnology (NANOTEC), National Research Council, via Monteroni, 73100, Lecce, Italy
- Department of Mathematics and Physics "Ennio De Giorgi", Università del Salento, via per Arnesano, 73100 Lecce, Italy
| | - Zhenyu Jason Zhang
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Emanuele Mauri
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
| | - Alberto Rainer
- Department of Engineering, Università Campus Bio-Medico di Roma, via Álvaro del Portillo 21, 00128 Rome, Italy.
- Institute of Nanotechnology (NANOTEC), National Research Council, via Monteroni, 73100, Lecce, Italy
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7
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Koshkina O, Raju LT, Kaltbeitzel A, Riedinger A, Lohse D, Zhang X, Landfester K. Surface Properties of Colloidal Particles Affect Colloidal Self-Assembly in Evaporating Self-Lubricating Ternary Droplets. ACS APPLIED MATERIALS & INTERFACES 2022; 14:2275-2290. [PMID: 34931807 PMCID: PMC8763378 DOI: 10.1021/acsami.1c19241] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/29/2021] [Indexed: 05/05/2023]
Abstract
In this work, we unravel the role of surface properties of colloidal particles on the formation of supraparticles (clusters of colloidal particles) in a colloidal Ouzo droplet. Self-lubricating colloidal Ouzo droplets are an efficient and simple approach to form supraparticles, overcoming the challenge of the coffee stain effect in situ. Supraparticles are an efficient route to high-performance materials in various fields, from catalysis to carriers for therapeutics. Yet, the role of the surface of colloidal particles in the formation of supraparticles using Ouzo droplets remains unknown. Therefore, we used silica particles as a model system and compared sterically stabilized versus electrostatically stabilized silica particles─positively and negatively charged. Additionally, we studied the effect of hydration. Hydrated negatively charged silica particles and sterically stabilized silica particles form supraparticles. Conversely, dehydrated negatively charged silica particles and positively charged amine-coated particles form flat film-like deposits. Notably, the assembly process is different for all the four types of particles. The surface modifications alter (a) the contact line motion of the Ouzo droplet and (b) the particle-oil and particle-substrate interactions. These alterations modify the particle accumulation at the various interfaces, which ultimately determines the shape of the final deposit. Thus, by modulating the surface properties of the colloidal particles, we can tune the shape of the final deposit, from a spheroidal supraparticle to a flat deposit. In the future, this approach can be used to tailor the supraparticles for applications such as optics and catalysis, where the shape affects the functionality.
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Affiliation(s)
- Olga Koshkina
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Lijun Thayyil Raju
- Physics
of Fluids Group, Max Planck Center for Complex Fluid Dynamics, MESA+
Institute and J. M. Burgers Center for Fluid Dynamics, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Anke Kaltbeitzel
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Andreas Riedinger
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Detlef Lohse
- Physics
of Fluids Group, Max Planck Center for Complex Fluid Dynamics, MESA+
Institute and J. M. Burgers Center for Fluid Dynamics, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
- Max
Planck Institute for Dynamics and Self-Organisation, 37077 Göttingen,
Am Fassberg 17, Germany
| | - Xuehua Zhang
- Physics
of Fluids Group, Max Planck Center for Complex Fluid Dynamics, MESA+
Institute and J. M. Burgers Center for Fluid Dynamics, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
- Department
of Chemical and Materials Engineering, University
of Alberta, 12-380 Donadeo Innovation Centre for Engineering, Edmonton, T6G1H9 Alberta, Canada
| | - Katharina Landfester
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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8
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Nanodispersions of Polyelectrolytes Based on Humic Substances: Isolation, Physico-Chemical Characterization and Evaluation of Biological Activity. Pharmaceutics 2021; 13:pharmaceutics13111954. [PMID: 34834368 PMCID: PMC8623726 DOI: 10.3390/pharmaceutics13111954] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 11/12/2021] [Accepted: 11/16/2021] [Indexed: 12/16/2022] Open
Abstract
Natural polyelectrolytes, including in the form of complexes with colloidal particles, are increasingly used in pharmacy due to the possibility of regulated attachment of medicinal substances and their targeted delivery to the target organ. However, the formation, stability, and molecular-mass characteristics of polyelectrolyte nanodispersions (ND) vary depending on the nature and composition of the medium of their origin. This is due to the lack of standardized approaches to quality control and regulatory documentation for most natural ND. In this paper, we first introduced the isolation, followed by investigations into their physico-chemical properties and bioactivity. Using the dried droplet method, we were able to detect the “coffee ring effect”. Fractographic studies of the surface structure of EHA and FA dried samples using SEM showed its heterogeneity and the presence of submicron particles encapsulated in the internal molecular cavities of polyelectrolyte. FTIR spectroscopy revealed the ND chemical structure of benzo-α-pyron and benzo-γ-pyron, consisting of nanoparticles and a branched frame part. The main elements detected by X-ray fluorescence in humic substance extract and fulvic acid include Si, P, S, K, Ca, Mn, Fe, Cu, Zn, whereas Fe is in high concentrations. The UV-spectra and fluorescent radiation demonstrated the possibility of studying the effect of the fulvate chromone structure on its optical properties. It is shown that dilution of the initial solutions of polyelectrolytes 1:10 contributes to the detection of smaller nanoparticles and an increase in the absolute value of the negative ζ-potential as a factor of ND stability. A study of the EHS effect on the SARS-CoV-2 virus infectious titer in the Vero E6 cell showed the effective against virus both in the virucidal scheme (the SI is 11.90–22.43) and treatment/prevention scheme (the SI is 34.85–57.33). We assume that polyelectrolyte ND prevent the binding of the coronavirus spike glycoprotein to the receptor. Taking into account the results obtained, we expect that the developed approach can become unified for the standardization of the ND natural polyelectrolytes complex, which has great prospects for use in pharmacy and medicine as a drug with antiviral activity.
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9
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Huang Q, Wang W, Vikesland PJ. Implications of the Coffee-Ring Effect on Virus Infectivity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11260-11268. [PMID: 34525305 DOI: 10.1021/acs.langmuir.1c01610] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The factors contributing to the survival of enveloped viruses (e.g., influenza and SARS-CoV-2) on fomite surfaces are of societal interest. The bacteriophage Phi6 is an enveloped viral surrogate commonly used to study viability. To investigate how viability changes during the evaporation of droplets on polypropylene, we conducted experiments using a fixed initial Phi6 concentration while systematically varying the culture concentration and composition (by amendment with 2% fetal bovine serum (FBS), 0.08 wt % BSA, or 0.5 wt % SDS). The results were consistent with the well-founded relative humidity (RH) effect on virus viability; however, the measured viability change was greater than that previously reported for droplets containing either inorganic salts or proteins alone, and the protein effects diverged in 1× Dulbecco's modified Eagle's medium (DMEM). We attribute this discrepancy to changes in virus distribution during droplet evaporation that arise due to the variable solute drying patterns (i.e., the "coffee-ring" effect) that are a function of the droplet biochemical composition. To test this hypothesis, we used surface-enhanced Raman spectroscopy (SERS) imaging and three types of gold nanoparticles (pH nanoprobe, positively charged (AuNPs(+)), and negatively charged (AuNPs(-))) as physical surrogates for Phi6 and determined that lower DMEM concentrations, as well as lower protein concentrations, suppressed the coffee-ring effect. This result was observed irrespective of particle surface charge. The trends in the coffee-ring effect correlate well with the measured changes in virus infectivity. The correlation suggests that conditions resulting in more concentrated coffee rings provide protective effects against inactivation when viruses and proteins aggregate.
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Affiliation(s)
- Qishen Huang
- Civil and Environmental Engineering and Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Wei Wang
- Civil and Environmental Engineering and Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Peter J Vikesland
- Civil and Environmental Engineering and Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology, Virginia Tech, Blacksburg, Virginia 24061, United States
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10
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Tanis-Kanbur MB, Kumtepeli V, Kanbur BB, Ren J, Duan F. Transient Prediction of Nanoparticle-Laden Droplet Drying Patterns through Dynamic Mode Decomposition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2787-2799. [PMID: 33577318 DOI: 10.1021/acs.langmuir.0c03546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nanoparticle-laden sessile droplet drying has a wide impact on applications. However, the complexity affected by the droplet evaporation dynamics and particle self-assembly behavior leads to challenges in the accurate prediction of the drying patterns. We initiate a data-driven machine learning algorithm by using a single data collection point via a top-view camera to predict the transient drying patterns of aluminum oxide (Al2O3) nanoparticle-laden sessile droplets with three cases according to particle sizes of 5 and 40 nm and Al2O3 concentrations of 0.1 and 0.2 wt %. Dynamic mode decomposition is used as the data-driven learning model to recognize each nanoparticle-laden droplet as an individual system and then apply the transfer learning procedure. Along 270 s of droplet drying experiments, the training period of the first 100 s is selected, and then the rest of the 170 s is predicted with less than a 10% error between the predicted and the actual droplet images. The developed data-driven approach has also achieved the acceptable prediction for the droplet diameter with less than 0.13% error and a coffee-ring thickness over a range of 2.0 to 6.7 μm. Moreover, the proposed machine learning algorithm can recognize the volume of the droplet liquid and the transition of the drying regime from one to another according to the predicted contact line and the droplet height.
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Affiliation(s)
| | - Volkan Kumtepeli
- Energy Research Institute, Nanyang Technological University, Singapore 637371
| | - Baris Burak Kanbur
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
| | - Junheng Ren
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
| | - Fei Duan
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798
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