Article
Polymer Science
Bin Cheng, Haitong Zhao, Jingfa Yang, Jiang Zhao
Summary: Continuous monitoring of the re-entrant phase separation inside evaporating droplets of PNIPAM solution with ethanol and water binary solvent was conducted using optical microscopy. The higher evaporation rate of ethanol led to changes in solvent composition, causing the polymer to precipitate and redissolve due to cononsolvency. Direct observation revealed that phase separation occurred at the air-liquid interface and the precipitates were brought into the droplet by circulations induced by Marangoni flow, providing a new method of mass transportation during phase separation.
Article
Thermodynamics
Ji-Long Zhu, Wan -Yuan Shi
Summary: This paper numerically investigated the instability patterns of Marangoni flow in droplets on heated lyophobic surface using a three-dimensional model. The results revealed that longitudinal hydrothermal waves and oblique hydrothermal waves appeared sequentially with increasing Marangoni number and evaporative cooling number. However, for a small Pr, oblique hydrothermal waves were generated and transformed into longitudinal hydrothermal waves as Pr increased. The presence of a sufficiently large evapo-rative cooling number favored the incipience of longitudinal hydrothermal waves.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Multidisciplinary Sciences
Hossein Zargartalebi, S. Hossein Hejazi, Amir Sanati-Nezhad
Summary: The authors introduce a passive protocol to suppress the coffee-ring effect and form uniform films at micro- and nanoscales by combining superhydrophilic substrate with a neutral-wetting low-roughness mold. This method has broad applications in fabricating ordered coatings, producing nanofilters, and creating functionalized nanosensors.
NATURE COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Lionel Perrin, Andrew Akanno, Eduardo Guzman, Francisco Ortega, Ramon G. Rubio
Summary: The study investigated the formation of coffee-ring deposits during the evaporation of droplets containing specific surfactants, revealing that the morphology of the deposits is related to the concentration of the anionic surfactants.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Thermodynamics
Mohammad Amin Kazemi, Sepehr Saber, Janet A. W. Elliott, David S. Nobes
Summary: The study reveals the occurrence of Marangoni convection in an evaporating pure water drop, with convective structures observed through careful preparation of the test liquid suspension. A mathematical model was developed and numerically solved to further support the experimental data. The research stands out as it allows the droplet to evaporate spontaneously in normal laboratory conditions, without external heating of the substrate.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Xiaoxiao Shao, Yu Hou, Xin Zhong
Summary: Experimental investigation on the evolution of the flow paradigm of an evaporating saline droplet reveals distinct flow patterns in two regimes divided by crystallization, with the commencement of crystallization triggering intense jet flow and symmetric vortices. The study demonstrates that the jet flow with vortices is an intrinsically solutal Marangoni flow caused by the saline concentration gradient at the free surface.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Xiaoxiao Shao, Yu Hou, Xin Zhong
Summary: The study investigates the effects of saline and surfactant concentrations on the evaporative dynamics and crystallization patterns of sessile droplets. Different concentrations lead to variations in crystal mobility and result in different crystal morphologies.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
K. Sefiane, R. E. Christy, G. Duursma, J. C. Ebeling, T. Seewald, S. Harmand
Summary: There is growing interest in the use of self-rewetting mixtures for micro-scale heat transfer systems. These fluids, with increased surface tension at higher temperatures, are expected to provide enhanced evaporative cooling performance. However, the mechanism behind these improvements is not fully understood. Through studying the flow within evaporating drops of 1pentanol-water mixtures, researchers have observed three stages in the evaporation process. These stages involve the formation of a toroidal vortex, pulsating vortex, and radial outward flow.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Xue Li, Brandon Murray, Shankar Narayan
Summary: In this study, the evaporation process of water droplets on a thin quartz substrate is analyzed using a numerical model. The model considers mass and heat transfer, as well as interfacial force balance, and agrees well with experimental results. The study highlights the importance of surface wettability in evaporation dynamics.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Rongrong Shao, Xiao Meng, Zhaojie Shi, Jiajia Zhong, Zheren Cai, Junhao Hu, Xiao Wang, Gang Chen, Shenghua Gao, Yanlin Song, Chunhong Ye
Summary: A novel method for assembling cellulose nanocrystals (CNCs) into concentric alignment using capillary flow and Marangoni effect is demonstrated, contrasting traditional assembly methods. This concentric assembly shows excellent uniformity and high resolution, and can be easily regulated by temperature. Combining with 3D inkjet technology, a functional binary system for information encryption and decryption is established.
Article
Environmental Sciences
Walid Foudhil, Costanza Arico, Patrick Perre, Sadok Ben Jabrallah
Summary: This study numerically investigates the evaporation of a sessile liquid droplet under different heating configurations, showing that the Marangoni flow within the droplet can be controlled by the heating setup. Different heating methods impact the flow patterns and intensities within the droplet.
Article
Thermodynamics
Tian-Shi Wang, Wan-Yuan Shi
Summary: The experimental investigation in this work reveals the Marangoni convection patterns in an evaporating droplet deposited on a volatile liquid layer, showing two types of instabilities under different equilibrium state. The surface patterns evolve with evaporation, forming various structures and convection cells, with gaps appearing at the contact line of adjacent cells. The influence of substrate temperature on instability patterns is studied, and the critical thicknesses of liquid layer for the onsets of these patterns are determined, providing insights into the physical mechanisms underlying these phenomena.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Lin Teng, Weifeng Wang, Xin Huang, Xiaoming Luo, Weidong Li, Jiaqing Li, Pengbo Yin, Yu Luo, Lilong Jiang
Summary: The evaporation kinetic mechanisms of sessile droplets are investigated using numerical simulations. A model combining flow, heat transfer, and vapor transport equations is developed based on the Arbitrary Lagrange-Euler (ALE) method. The numerical results are validated and shown to be consistent with experimental results. The study reveals that the formation and evolution of internal flow in an evaporating droplet are influenced by thermal conduction distance and evaporative cooling effect. The results provide theoretical and practical guidance for exploring more efficient heat transfer techniques.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Multidisciplinary Sciences
Dieter A. Baumgartner, Samira Shiri, Shayandev Sinha, Stefan Karpitschka, Nate J. Cira
Summary: This study explores the rich dynamics of fully miscible, three-component droplets composed of water, ethanol, and propylene glycol on completely wetting glass substrates. The research finds that evaporation changes the composition and shape of the droplet, altering its spreading behavior. This research has practical significance in the collection, aggregation, and removal of contaminants.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Kai Feng, Jose Carlos Urena Marcos, Aritra K. Mukhopadhyay, Ran Niu, Qiang Zhao, Jinping Qu, Benno Liebchen
Summary: This study reports the first all-aqueous droplet swimmer powered by self-generated polyelectrolyte gradients, which exhibits memory-induced chirality while self-solidifying. The droplet swimmer can efficiently remove uranium from aqueous solutions and perform chiral motion autonomously. These findings provide a new approach to develop self-propelled agents for environmental remediation.
Article
Chemistry, Physical
Yosra Kotb, Alain Cagnard, Katelyn R. Houston, Saad A. Khan, Lilian C. Hsiao, Orlin D. Velev
Summary: The wetting characteristics of epoxy and phenolic resins on metals are influenced by the molecular interactions between the functional groups of the resins and the metal surface. Theoretical adhesion energies can reveal the microscopic adhesion mechanisms of epoxy-phenolic coatings on metals. Experimental results show that epoxy resins have superior adhesion compared to phenolic resins, with epoxy resins containing a higher content of epoxide-to-hydroxyl groups showing improved adhesion. Additionally, the adhesion of coatings on tin-free steel is found to be higher than on tinplated steel due to increased formation of hydrogen bonds.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Eleanor J. Ewins, Koohee Han, Bhuvnesh Bharti, Tom Robinson, Orlin D. Velev, Rumiana Dimova
Summary: The interaction between Janus particles and model cell membrane systems offers a controllable model system to study adhesion and encapsulation, mediated by electrostatic charge and iron patches. The ferromagnetic particle coatings enable manipulation and transport of vesicles by magnetic fields.
CHEMICAL COMMUNICATIONS
(2022)
Article
Health Care Sciences & Services
Md Golam Dostogir Harun, Md Mahabub Ul Anwar, Shariful Amin Sumon, Md Zakiul Hassan, Tahrima Mohsin Mohona, Aninda Rahman, Syed Abul Hassan Md Abdullah, Md Saiful Islam, S. Cornelia Kaydos-Daniels, Ashley R. Styczynski
Summary: Hospital-acquired infections (HAIs) and antimicrobial resistance (AMR) are major global health challenges, especially in developing countries. This study aims to strengthen infection prevention and control measures as well as antimicrobial stewardship programs in Bangladesh through tailored interventions and quality improvement projects to reduce the burden of HAIs and AMR.
BMC HEALTH SERVICES RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Md Munjurul Haque, Sabina Islam, Md Bahuddin Sikder, Md Saiful Islam, Annyca Tabassum
Summary: This study assesses the vulnerability of communities in the Jamuna floodplain in Bangladesh using an indexing method. The results show that Dewanganj and Islampur Upazilas have higher vulnerability, mainly due to poor socioeconomic conditions, low adaptive capacity, and high exposure. The study recommends infrastructure development and improving the coping capacity of the affected population.
Article
Engineering, Chemical
Rachel S. Bang, Michael Bergman, Tianyu Li, Fiona Mukherjee, Abdulelah S. Alshehri, Nicholas L. Abbott, Nathan C. Crook, Orlin D. Velev, Carol K. Hall, Fengqi You
Summary: This article proposes an integrated chemical engineering approach to improve our understanding of microplastics (MPs). Through artificial intelligence, theoretical methods, and experimental techniques, existing data can be integrated into models of MPs, unknown features of MPs can be investigated, and future research areas can be identified.
Article
Multidisciplinary Sciences
Md Golam Dostogir Harun, Md Mahabub Ul Anwar, Shariful Amin Sumon, Md Abdullah-Al-Kafi, Kusum Datta, Md Imdadul Haque, A. B. M. Alauddin Chowdhury, Sabrina Sharmin, Md Saiful Islam
Summary: This study aims to assess the knowledge, attitudes, and practices (KAP) towards infection prevention and control among nurses in a tertiary care hospital in Bangladesh. The results showed that most nurses had good knowledge but their practices did not reflect that knowledge. Regular training and practice monitoring can enhance the infection prevention and control practices among nurses.
Article
Immunology
Md. Golam Dostogir Harun, Shariful Amin Sumon, Tahrima Mohsin Mohona, Aninda Rahman, Syed Abul Hassan Md Abdullah, Md. Saiful Islam, Md. Mahabub Ul Anwar
Summary: This study investigated the hepatitis B vaccination coverage among Bangladeshi healthcare workers in selected tertiary care hospitals. The overall vaccination coverage was found to be 66.6%, with the lowest coverage among cleaning staff. It was also found that many healthcare workers lacked training on hepatitis B virus prevention and management.
Article
Chemistry, Multidisciplinary
Yosra Kotb, Christopher M. M. Serfass, Alain Cagnard, Katelyn R. R. Houston, Saad A. A. Khan, Lilian C. C. Hsiao, Orlin D. D. Velev
Summary: This study aims to reveal the corrosion protection mechanisms of intact thermosetting epoxy coatings on metal substrates. The structure-property relationships and the effect of metal surface passivation on the coatings are investigated. The results show that the corrosion resistance of the coatings is mainly determined by the density of the crosslinked molecular network, and the densely crosslinked network also provides higher toughness to withstand pressure from underlying corrosion products.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Infectious Diseases
Syed Moinuddin Satter, Kamal Ibne Amin Chowdhury, Refah Tamanna, Zarin Abdullah, S. M. Zafor Shafique, Md Saiful Islam, Nadia Ali Rimi, Muhammad Rashedul Alam, Arifa Nazneen, Mustafizur Rahman, Taufiqur Rahman Bhuiyan, Farzana Islam Khan, Mahbubur Rahman, A. S. M. Alamgir, Tahmina Shirin, Mahmudur Rahman, Firdausi Qadri, Meerjady Sabrina Flora, Sayera Banu
Summary: The study found that residents in Dhaka, Bangladesh generally perceive the coronavirus as a punishment from a higher power, lack concern for the severity of the pandemic, have misconceptions, are reluctant to undergo testing and isolation measures. It is necessary to take targeted interventions to dispel these misconceptions.
TROPICAL MEDICINE AND INFECTIOUS DISEASE
(2022)
Editorial Material
Chemistry, Physical
Marie Pierre Krafft, Orlin D. Velev, Nicholas Lawrence Abbott
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Sachin Agate, Austin Williams, Joseph Dougherty, Orlin D. Velev, Lokendra Pal
Summary: Predictive measurement of colors in transparent polymers and plastics is challenging due to the forms of pellets or granules used in the processing. This article discusses the factors affecting perceptive colors, as well as the methods used for color characterization and minimizing measuring artifacts, such as surface texture and particle sizes.
Article
Chemistry, Physical
Matthew A. Dorsey, Orlin D. Velev, Carol K. Hall
Summary: In this paper, the self-assembling characteristics of a new class of microscopic cube-shaped colloids with a magnetic dipole were investigated. Simulation results showed that these particles tend to form either single- or double-stranded assemblies with unique structures and phase diagrams in the temperature-density plane. These findings have important implications for the development of materials with controllable properties.
Review
Chemistry, Physical
Abhirup Basu, Lilian B. B. Okello, Natasha Castellanos, Sangchul Roh, Orlin D. D. Velev
Summary: This review article discusses the long-ranged interactions induced by magnetic fields and capillary forces in multiphasic fluid-particle systems, which facilitate the assembly of various colloidal structures and materials. The use of magnetic fields is an efficient means of assembling and manipulating paramagnetic particles, while capillary forces serve as means of reconfigurable binding in soft matter systems. The article also explores the combined use of magnetic and capillary forces in assembling particles at fluid interfaces or in the bulk, and presents examples of their applications in magnetically responsive foams, gels, and pastes for 3D printing.
Article
Biotechnology & Applied Microbiology
Nitika Gupta, Richa Rai, Sabina Islam, R. P. Meena, V. K. Baranwal
Summary: This study aimed to produce specific polyclonal antibodies to Leek yellow stripe virus (LYSV) using recombinant coat protein (CP) for screening and indexing of garlic germplasm. The CP gene was cloned, sequenced, and subcloned to express a fusion protein. The produced antiserum was able to recognize LYSV and successfully diagnose it in garlic accessions.
LETTERS IN APPLIED MICROBIOLOGY
(2023)
Article
Food Science & Technology
Stuart J. Williams, Sabina Islam, Orlin D. Velev
Summary: This report uses light scattering techniques to quantitatively characterize the formation of colloids in bourbon whiskeys, finding that higher water dilution reduces the size of colloidal particulates and increases stability. Additionally, aged whiskeys have a higher concentration of colloids.
JOURNAL OF THE INSTITUTE OF BREWING
(2022)
