DropletPub Date : 2025-07-21DOI: 10.1002/dro2.70023
Yuxin Song, Zuohua Huang, Chenglong Tang
{"title":"Back Cover, Volume 4, Number 3, July 2025","authors":"Yuxin Song, Zuohua Huang, Chenglong Tang","doi":"10.1002/dro2.70023","DOIUrl":"https://doi.org/10.1002/dro2.70023","url":null,"abstract":"<p><b>Back Cover</b>: The cover image is based on the Research Article <i>Hypergolic droplet–film interaction dynamics at high temperatures</i> by Song et al.</p><p>Cover description: This cover image illustrates the phenomenon of chemically induced micro-explosions generated when an oxidizer droplet impacts a liquid fuel film, accompanied by the formation of numerous high-temperature micro-droplets. Our research clarifies the reactive processes occurring between the coolant films on the thrust chamber walls of liquid rocket engines and the settling oxidizer droplets from the mainstream region, and how these reactions affect the cooling efficiency of the liquid film. (DOI: 10.1002/dro2.70003)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Inside Back Cover, Volume 4, Number 3, July 2025","authors":"Ying Zhou, Wenchang Zhao, Shiyu Wang, Yanhong Li, Shuxian Tang, Yutong Zheng, Pingan Zhu","doi":"10.1002/dro2.70026","DOIUrl":"https://doi.org/10.1002/dro2.70026","url":null,"abstract":"<p><b>Inside Back Cover</b>: The cover image is based on the Research Article <i>Bubble-induced symmetry breaking in droplet impact</i> by Zhou et al.</p><p>Cover description: On flat surfaces, impacting droplets typically exhibit symmetric bouncing dynamics. Here, we demonstrate that embedding a pair of bubbles within a droplet enables asymmetric impact behavior on super-repellent surfaces, where spreading and receding occur simultaneously. This symmetry-breaking dynamics reduces both contact time and contact area, arising from anisotropic capillary effects induced by the encapsulated bubbles. (DOI: 10.1002/dro2.70006)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Inside Front Cover, Volume 4, Number 3, July 2025","authors":"Mengchen Cui, Hongyue Chen, Xiuxing Tang, Yutong Guo, Xianyu Nong, Changlin Ding, Zhijun Wang, Xin Gao, Duyang Zang","doi":"10.1002/dro2.70027","DOIUrl":"https://doi.org/10.1002/dro2.70027","url":null,"abstract":"<p><b>Inside Front Cover</b>: The cover image is based on the Research Article <i>Containerless emulsification of acoustically levitated composite drop</i> by Cui et al.</p><p>Cover description: We report the first realization of containerless emulsification of water and castor oil under ultrasonic levitation. The cover image visually demonstrates how regulating the sound field intensity on the levitated composite drop surface triggers upper-surface atomization, directly facilitating containerless emulsification. This containerless emulsification approach has successfully prepared W/O emulsions with droplet diameters of approximately 2–3 μm, highlighting a novel integration of acoustic levitation and emulsion preparation. (DOI: 10.1002/dro2.70005)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-07-21DOI: 10.1002/dro2.70025
Gonzalo Almanza, Ricardo M. Trujillo, Diego Sánchez-Saldaña, Øystein Røsand, Morten Høydal, Maria Fernandino, Carlos A. Dorao
{"title":"Frontispiece, Volume 4, Number 3, July 2025","authors":"Gonzalo Almanza, Ricardo M. Trujillo, Diego Sánchez-Saldaña, Øystein Røsand, Morten Høydal, Maria Fernandino, Carlos A. Dorao","doi":"10.1002/dro2.70025","DOIUrl":"https://doi.org/10.1002/dro2.70025","url":null,"abstract":"<p><b>Frontispiece</b>: The cover image is based on the Research Article <i>Micro-size aperture surface acoustic wave generator for cell lysis</i> by Almanza et al.</p><p>Cover description: Micro-sized aperture surface acoustic wave generators effectively lyse cells by using focused acoustic energy. The device provides precise, efficient, and scalable cell disruption, potentially benefiting biomedical research and diagnostics by enabling controlled, label-free sample preparation. (DOI: 10.1002/dro2.70015)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-07-21DOI: 10.1002/dro2.70028
Yutong Wang, Shenghao Yang, Chonglei Hao, Binhong Dou, Lei Zhang, Yongle Feng, Shichuan Wang, Fuzhou Niu, Ran Tao, Sen Wang, Bing Li, Zuankai Wang
{"title":"Front Cover, Volume 4, Number 3, July 2025","authors":"Yutong Wang, Shenghao Yang, Chonglei Hao, Binhong Dou, Lei Zhang, Yongle Feng, Shichuan Wang, Fuzhou Niu, Ran Tao, Sen Wang, Bing Li, Zuankai Wang","doi":"10.1002/dro2.70028","DOIUrl":"https://doi.org/10.1002/dro2.70028","url":null,"abstract":"<p><b>Front Cover</b>: The cover image is based on the Research Article <i>Thermo-magnetic soft robot for adaptive locomotion and delivery</i> by Wang et al.</p><p>Cover description: This cover illustrates a thermo-magnetic soft robot integrating light-responsive liquid crystal elastomers with embedded magnetic particles. The robot undergoes reversible petal-like shape morphing under near-infrared light and magnetically guided rolling locomotion. Demonstrating adaptive motion and delivery across diverse environments, it paves the way for versatile applications in biomedical transport, environmental sensing, and soft robotic systems. (DOI: 10.1002/dro2.70016)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-06-11DOI: 10.1002/dro2.70015
Gonzalo Almanza, Ricardo M. Trujillo, Diego Sánchez-Saldaña, Øystein Røsand, Morten Høydal, Maria Fernandino, Carlos A. Dorao
{"title":"Micro-size aperture surface acoustic wave generator for cell lysis","authors":"Gonzalo Almanza, Ricardo M. Trujillo, Diego Sánchez-Saldaña, Øystein Røsand, Morten Høydal, Maria Fernandino, Carlos A. Dorao","doi":"10.1002/dro2.70015","DOIUrl":"https://doi.org/10.1002/dro2.70015","url":null,"abstract":"<p>The breakage of the cellular membrane for releasing intracellular material is the starting point for several diagnostics or treatment processes. Surface acoustic waves can provide a novel and chemical-free approach by inducing acoustic streaming generating high shear stress inside a droplet containing cells. However, the power required to achieve an efficient cell lysis can lead to the displacement of the droplet and even the nebulization of the droplet. This effect is aggravated as the droplet size is reduced. In this work, we demonstrate the possibility overcoming the mentioned issue by a micro-size aperture surface acoustic wave generator operating at high frequency. By reducing the aperture of the surface acoustic wave generator to a fraction of the diameter of the deposited droplet, the localized acoustic streaming can lead to high shear stress while not exceeding the adhesion force of the droplet preventing droplet motion or nebulization. This concept can lyse AC16 human cardiomyocyte cells with efficiencies of 80% comparable to a chemical lysis method in 60 s of exposure time.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-05-09DOI: 10.1002/dro2.70014
Qibo Liu, Qitong Su, Qiu Hong, Yao Lu, Shuai Huang, Kai Feng
{"title":"A droplet splitter: Simple, controlled and efficient droplet splitting using superhydrophobic pyramid structures","authors":"Qibo Liu, Qitong Su, Qiu Hong, Yao Lu, Shuai Huang, Kai Feng","doi":"10.1002/dro2.70014","DOIUrl":"https://doi.org/10.1002/dro2.70014","url":null,"abstract":"<p>Droplet splitting technology presents considerable potential for advancing applications in sample encapsulation, manipulation, chemical reaction control, and precision measurement systems. However, existing methodologies frequently encounter limitations related to complex operation and high cost. To address the need for controllable, high-precision, and cost-efficient droplet splitting, this study combines three-dimensional printing technology with superhydrophobic surface modification to fabricate pyramid microstructures with customized splitting functionalities. The pyramidal sharp edges act as “fluidic blades” to split droplets through the synergistic interaction of edge-induced capillary forces and inertial forces generated at the liquid film periphery during spreading dynamics. Upon penetration by the pyramid apex, the droplet forms an annular liquid ring that subsequently fragments into sub-droplets, enabling programmable splitting. A comprehensive experimental and computational framework was developed to investigate splitting dynamics, force distribution patterns, and geometric dependence of pyramid structures on splitting performance. Results indicate that increased Weber numbers, larger droplet volumes, and reduced pyramid apex angles markedly improve splitting controllability. Additionally, six- and 12-sided pyramid-based splitting/collection devices were engineered to demonstrate practical implementations, including on-demand droplet splitting and liquid marble synthesis. This work establishes a scalable, low-cost platform for precision droplet manipulation with significant implications for microfluidic devices and lab-on-a-chip technologies.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-05-07DOI: 10.1002/dro2.70007
Meng Yan, Yueke Niu, Miao Sun, Yanbo Xie
{"title":"Onsager relation for electrokinetics at surfactant-covered bubble film","authors":"Meng Yan, Yueke Niu, Miao Sun, Yanbo Xie","doi":"10.1002/dro2.70007","DOIUrl":"https://doi.org/10.1002/dro2.70007","url":null,"abstract":"<p>We analytically describe the slip length of the surfactant-covered bubble film under the joint actions of pressure gradient and electric field. Considering the Marangoni effect, the slip length and consequent zeta potential of the liquid‒vapor interface significantly reduced compared to the Marangoni-free interface at low surfactant concentrations, due to the surfactant accumulation at downstream of the bubble liquid film. In addition, we discovered that the friction coefficient of the liquid‒vapor interface becomes field dependent in a regime of strong coupling among volume flow, surfactant transport, and ionic current at the liquid‒vapor interface. We use the Onsager reciprocal relationship to describe the electrokinetic effects within a bubble film, including flow velocity, ionic current, and surfactant transport, which can describe the Marangoni effects while considering multi-physical effects.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144672736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-04-28DOI: 10.1002/dro2.70016
Yutong Wang, Shenghao Yang, Chonglei Hao, Binhong Dou, Lei Zhang, Yongle Feng, Shichuan Wang, Fuzhou Niu, Ran Tao, Sen Wang, Bing Li, Zuankai Wang
{"title":"Thermo-magnetic soft robot for adaptive locomotion and delivery","authors":"Yutong Wang, Shenghao Yang, Chonglei Hao, Binhong Dou, Lei Zhang, Yongle Feng, Shichuan Wang, Fuzhou Niu, Ran Tao, Sen Wang, Bing Li, Zuankai Wang","doi":"10.1002/dro2.70016","DOIUrl":"https://doi.org/10.1002/dro2.70016","url":null,"abstract":"<p>Soft robots based on stimuli-responsive materials, such as those responsive to thermal, magnetic, or light stimuli, hold great potential for adaptive locomotion and multifunctionality in complex environments. Among these, liquid crystal elastomers (LCEs) and magnetic microparticles have emerged as particularly promising candidates, leveraging their thermal responsiveness and magnetic controllability, respectively. However, integrating these modes to achieve synergistic multimodal actuation remains a significant challenge. Here, we present the thermo-magnetic petal morphing robot, which combines LCEs with embedded magnetic microparticles to enable reversible shape morphing via remote light-to-thermal actuation and high-speed rolling locomotion under external magnetic fields. The robot can achieve rapid deformation under near-infrared light, transitioning from a closed spherical to an open cross-like configuration with consistent shape recovery across multiple cycles, and demonstrates a maximum locomotion speed of 30 body lengths per second, outperforming many state-of-the-art soft robots. Moreover, the robot's performance remains robust across dry, wet, and underwater conditions, with adjustable magnetic particle concentrations allowing tunable actuation performance. Our work addresses the need for soft robots with enhanced versatility and adaptability in complex environments, paving the way for applications in areas such as targeted drug delivery and industrial material handling.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144673160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
DropletPub Date : 2025-04-23DOI: 10.1002/dro2.70009
Tong Tong, Huaiqing Hu, Yuanhao Xie, Jing Jin
{"title":"Frontispiece, Volume 4, Number 2, April 2025","authors":"Tong Tong, Huaiqing Hu, Yuanhao Xie, Jing Jin","doi":"10.1002/dro2.70009","DOIUrl":"https://doi.org/10.1002/dro2.70009","url":null,"abstract":"<p><b>Frontispiece</b>: The cover image is based on the Review Article <i>Advancements in liquid marbles as an open microfluidic platform: Rapid formation, robust manipulation, and revolutionary applications</i> by Tong et al.</p><p>Cover description: Liquid marbles (LMs)—particle-coated non-wetting droplets—reshape microfluidics through their “3R trilogy”: <b>Rapid formation, Robust manipulation, and Revolutionary applications</b>. This review dissects LM generation, structural dynamics under stimuli, and roles in digital microfluidics, biochemical sensing, and soft robotics. Synthesizing advances (2014–2024), it illuminates LM-based platforms' future trajectories, inspiring innovations in open microfluidic systems. (DOI: 10.1002/dro2.160)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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