Article
Mechanics
Xiang-gang Cheng, Xiao-peng Chen
Summary: This study demonstrates that a compound jet with a water core and an oil shell can be generated by impacting a concave dual-layer liquid surface, providing reliable data support for the preparation of compound jets.
JOURNAL OF HYDRODYNAMICS
(2021)
Article
Mechanics
D. Zrnic, P. Berglez, G. Brenn
Summary: Theoretical investigation is conducted on the nonlinear axisymmetric shape oscillations of a Newtonian drop in a vacuum, revealing phenomena such as surface deformation, frequency decrease, and quasi-periodicity of motion. Viscosity is found to dampen nonlinear behavior and enhance the coupling of different oscillation modes.
Article
Polymer Science
Veronica Vespini, Sara Coppola, Pietro Ferraro
Summary: Researchers have demonstrated a strategy that combines the formation of polymer thin films and self-propulsion in floating objects. By delivering polymer droplets with the right solvent concentration onto floating objects, instant polymer thin films can be formed at the water surface, providing this unique functionality.
Article
Engineering, Chemical
Cao Liu, Lingrui Cui, Jun Xu, Lian Cen, Jinshan Xu, Peixun Li, Tiancun Xiao, Fahai Cao
Summary: The emulsified feedstock technique utilizes micro-explosion phenomenon of emulsion to improve product performance, but the contradiction between emulsion stability and micro-explosion intensity hinders its applications. In this study, water-soluble polymers, namely xanthan gum (XG) and nonionic polyacrylamide (NPAM), were investigated to solve this problem. The results show that there are five forms of micro-explosions, with the intensity of optimal micro-explosion three orders of magnitude higher than other forms. Adding 0.5 g/dL XG increases the probability of optimal micro-explosion from 0 to 60%, while NPAM does not promote micro-explosion due to its strong surface activity. A new mechanism related to liquid-gas interfacial tension, liquid-liquid interfacial tension, and viscosity is proposed.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Mechanics
Santosh Kumar Jena, Tushar Srivastava, Supreet Singh Bahga, Sasidhar Kondaraju
Summary: In a T-junction microchannel, the channel width has a significant impact on droplet generation, affecting both droplet size and frequency. This study extends a previous model to account for the varying width ratio between the dispersed and continuous phase channels. Experimental results validate the proposed scaling law and show that an increase in the width of the continuous phase channel leads to an increase in droplet length but a decrease in droplet production frequency. Similar behavior is observed with variations in the width of the dispersed phase channel. Overall, this research provides new insights into the effect of channel width on droplet length and frequency.
Article
Chemistry, Physical
M. Mohib Ur Rehman, Gyoko Nagayama
Summary: In this study, it was found that the presence of micro/nanostructured surfaces significantly affects the evaporation rate of droplets, with the wettability and volume of the droplets further influencing this effect. Theoretical and experimental results showed agreement when the scale of the solid-liquid-vapor interface (slv) was negligible. For microstructured surfaces, the scale of the slv interface could reach 253-940 μm, and the evaporation rate at the slv interface accounted for 16-48% of the total evaporation rate. The scale and rate of the slv interface increased with a decrease in the initial contact angle or an increase in the droplet volume. These findings are important for practical engineering and medical applications involving droplet evaporation on micro/nanostructured surfaces.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Dayong Li, Juan Gu
Summary: This study estimated the pinning force of surface nanobubbles by calculating the driven force for the bubbles to protrude from and extend around the nanopits. The results showed that the pinning force increases with the increase in bubble size, while the pinning strength decreases with the increase in bubble size.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
H. P. Tran, L. Delance, N. Passade-Boupat, E. Verneuil, F. Lequeux, L. Talini
Summary: The study reveals that single bubbles or foams formed in mixtures of liquids have longer lifetimes due to differences in bulk and interfacial concentrations inducing a thickness dependence of surface tension, resulting in a stabilizing Marangoni effect. Nonlinear variations of surface tension with composition in asymmetric binary mixtures are found to be associated with large foam lifetimes. This research sheds new light on foamability without added surfactants by discussing variations in surface tension based on a simple thermodynamic model.
Article
Mechanics
Su Cheong Park, Young Hyun Kim, Jin Gyu Jang, Hak Rae Cho, Ho Jae Kwak, Jong Hyun Kim, Dong In Yu
Summary: In this study, dynamic contact angles of various aqueous fluids in hydrophobic minitubes and microtubes were measured using synchrotron x-ray imaging with high temporal/spatial resolutions. The analysis of the results provided insights into the changes in dynamic/static contact angles and pressure drops.
Article
Mechanics
V. M. Marinosci, N. G. J. Helthuis, L. Chu, W. J. B. Grouve, M. B. de Rooij, S. Wijskamp, R. Akkerman
Summary: This study experimentally investigated the effect of crystallinity on the fracture toughness of titanium-PEKK interfaces. The results showed that samples with a high degree of crystallinity exhibited lower fracture toughness and dominant cohesive failure, while lowering the crystallinity led to higher fracture toughness and a transition from cohesive to interfacial failure.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Electrochemistry
Tehseen Adel, Juan Velez-Alvarez, Anne C. Co, Heather C. Allen
Summary: Surface potential measurement values at gas-liquid interfaces can be ambiguous due to lack of standardization in calibration and normalization methods. The proposed circuit model based on americium-241 demonstrates reliability in quantifying surface potential. Validation with surface tension measurements further confirms the accuracy of the ionizing method.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Sourav Mondal
Summary: The research investigates the phase separation dynamics of a polymer-solvent system during spinodal decomposition in a spin coating process, revealing the impact of prepattern topography, substrate wettability, spin-coating rotational speed, and polymer composition on the phase separation dynamics.
Article
Engineering, Electrical & Electronic
Qiong Liu, Fei Huang, Maria Muzamil Memon, Shuliang Pan, Tao Wang, Bin Peng, Wanli Zhang
Summary: In this study, a Lamb wave viscosity sensor was fabricated and a novel 2-D array model based on finite element analysis was proposed for viscosity sensing. The dependence of the sensor's resonant frequency on liquid morphology was simulated and experimentally tested, showing a linear relationship with the square of viscosity. This research contributes to reducing random errors in experiments and exploring the application of Lamb wave viscosity sensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Electrical & Electronic
Qiong Liu, Fei Huang, Maria Muzamil Memon, Shuliang Pan, Tao Wang, Bin Peng, Wanli Zhang
Summary: A Lamb wave viscosity sensor has been fabricated, and the frequency response of the sensor is found to be dependent on liquid morphology. Using glycerol-water mixtures, a linear relationship between the sensor's frequency response and viscosity has been demonstrated, with different results in simulation (238.92 ppm/(mPa s)(0.5)) and experiment (153.16 ppm/(mPa s)(0.5)). This work has the potential to reduce random error in experiments and pave the way for further exploration of Lamb wave viscosity sensors.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Polymer Science
Rishabha Malviya, Sheetal Jha, Neeraj Kumar Fuloria, Vetriselvan Subramaniyan, Srikumar Chakravarthi, Kathiresan Sathasivam, Usha Kumari, Dhanalekshmi Unnikrishnan Meenakshi, Omji Porwal, Akanksha Sharma, Darnal Hari Kumar, Shivkanya Fuloria
Summary: The rheological properties of tamarind seed polymer were characterized for potential commercialization in the food and pharmaceutical industry. The study found that the polymer solution is less sensitive to temperature changes compared to other gums, and has excellent physicochemical properties, making it a promising excipient for future drug formulation and application in the food and cosmetics industry.