Droplet最新文献 - Book学术

Frontispiece, Volume 4, Number 2, April 2025 封面，第四卷，第2期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70009

Tong Tong, Huaiqing Hu, Yuanhao Xie, Jing Jin

引用次数: 0

Inside Front Cover, Volume 4, Number 2, April 2025 封面内页，第四卷，第二期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70012

Zhejun Chong, Yi Zeng, Youlong Kang, Ke Ding, Xin Du, Zhongze Gu

引用次数: 0

Front Cover, Volume 4, Number 2, April 2025 封面，第四卷，第2期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70008

Tianhua Chen, Wenming Li

引用次数: 0

Back Cover, Volume 4, Number 2, April 2025 封底，第四卷，第二期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70010

Zhifeng Hu, Haojiang Ran, He Shan, Fuqiang Chu, Zuankai Wang, Ruzhu Wang

引用次数: 0

Inside Back Cover, Volume 4, Number 2, April 2025 内页封底，第四卷，第二期，2025年4月

Droplet Pub Date : 2025-04-23 DOI: 10.1002/dro2.70011

Leyun Feng, Wonjae Choi, Kyoo-Chul Park

引用次数: 0

Surfactant-mediated mobile droplets on smooth hydrophilic surfaces 光滑亲水表面上表面活性剂介导的可移动液滴

Droplet Pub Date : 2025-03-21 DOI: 10.1002/dro2.70004

Mohammad Alipanahrostami, Tyler R. McCoy, Mi Li, Wei Wang

{"title":"Surfactant-mediated mobile droplets on smooth hydrophilic surfaces","authors":"Mohammad Alipanahrostami, Tyler R. McCoy, Mi Li, Wei Wang","doi":"10.1002/dro2.70004","DOIUrl":"https://doi.org/10.1002/dro2.70004","url":null,"abstract":"Achieving mobile liquid droplets on solid surfaces is crucial for various practical applications, such as self-cleaning and anti-fouling coatings. The last two decades have witnessed remarkable progress in designing functional surfaces, including super-repellent surfaces and lubricant-infused surfaces, which allow droplets to roll/slide on the surfaces. However, it remains a challenge to enable droplet motion on hydrophilic solid surfaces. In this work, we demonstrate mobile droplets containing ionic surfactants on smooth hydrophilic surfaces that are charged similarly to surfactant molecules. The ionic surfactant-laden droplets display ultra-low contact angle and ultra-low sliding angle simultaneously on the hydrophilic surfaces. The sliding of the droplet is enabled by the adsorbed surfactant ahead of three-phase contact line, which is regulated by the electrostatic interaction between ionic surfactant and charged solid surface. The droplet can maintain its motion even when the hydrophilic surface has defects. Furthermore, we demonstrate controlled manipulation of ionic surfactant-laden droplets on hydrophilic surfaces with different patterns. We envision that our simple technique for achieving mobile droplets on hydrophilic surfaces can pave the way to novel slippery surfaces for different applications.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865653","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}

引用次数: 0

Highly efficient spray cooling enabled by acoustic microdroplet atomizer 采用声学微滴雾化装置，实现高效喷雾冷却

Droplet Pub Date : 2025-03-08 DOI: 10.1002/dro2.70002

Tianhua Chen, Wenming Li

{"title":"Highly efficient spray cooling enabled by acoustic microdroplet atomizer","authors":"Tianhua Chen, Wenming Li","doi":"10.1002/dro2.70002","DOIUrl":"https://doi.org/10.1002/dro2.70002","url":null,"abstract":"Droplets are ubiquitous in nature and play an essential role in spray cooling, which is a highly efficient cooling approach for high-power-density miniaturized electronic devices. However, conventional pressure-driven spray faces significant challenges in controlling microdroplet characteristics, particularly the droplet size and spray direction, both of which critically impact cooling performance. Herein, to conquer these challenges, we designed an acoustic microdroplet atomizer composed of a lead zirconate titanate (PZT) transducer and silicon inverted pyramid nozzles. This design enables precise control of droplet generation, overcoming the limitations of traditional spray methods. The acoustic atomization technology minimizes excess liquid accumulation while significantly enhancing thin liquid film evaporation. Compared to the conventional droplet generation techniques such as pressure-driven, injector-based, and piezoelectric spray, our acoustic atomizer achieves superior cooling performance. Notably, we demonstrate a high heat flux of ∼220 W/cm2 with a 3.6-fold enhancement at a low flow rate of 24 mL/min, achieving significantly improved cooling efficiency. Finally, our acoustic atomizer provides precise control over droplet size, velocity, and flow rate by adjusting the number of nozzles and the PZT transducer's resonant frequency, elevating spray cooling performance. This novel acoustic atomization cooling technology holds great promise for practical applications, particularly in the thermal management of compact electronic components.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865963","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}

引用次数: 0

Growth kinetics of electrochemically generated hydrogen bubbles at increased pressures 高压下电化学生成氢气气泡的生长动力学

Droplet Pub Date : 2025-03-08 DOI: 10.1002/dro2.70000

Yufei Wu, Wenhai Xu, Pengpeng Xie, Linfeng Yu, Zhaowang Dan, Wenyu An, Liang Luo, Xiaoming Sun

{"title":"Growth kinetics of electrochemically generated hydrogen bubbles at increased pressures","authors":"Yufei Wu, Wenhai Xu, Pengpeng Xie, Linfeng Yu, Zhaowang Dan, Wenyu An, Liang Luo, Xiaoming Sun","doi":"10.1002/dro2.70000","DOIUrl":"https://doi.org/10.1002/dro2.70000","url":null,"abstract":"Bubble growth kinetics has been attracting vast attention in water electrolysis and other gas evolution reactions, but mostly investigated under ambient pressure. For practical scenarios, bubble evolution is usually carried out under high pressure. To better understand the bubble growth kinetics, we monitored the hydrogen bubble evolution process at increased pressures during electrochemical hydrogen production. Unlike the common sense that high pressures could result in smaller bubble size, our results revealed that the increased pressure would increase the aerophilicity of electrode surface, with decreased bubble contact angle from 111° to 89° for 0.1‒2.0 MPa, increased detachment size from 233 to 1207 µm, and reduced growth coefficient from 230 to 10.9 for the high pressures from 0.1 to 3.0 MPa. The steady high-pressure bubble growth kinetics are basically governed by the as-formed supersaturation in bulk solution, which is the balance between the driving force (current density) and the enlarged solubility of bulk solution under high pressure. Insufficient driving force would induce the depletion of bulk supersaturation and stagnate the bubble growth. Further investigation on high-pressure bubble evolution behaviors should shed light on practical industrial electrode design with extended usage life.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.70000","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865962","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}

引用次数: 0

Liquid directional transport surface applied to the spacecraft fluid management system: Fundamentals and prospect analysis 液体定向输运面在航天器流体管理系统中的应用：基础与前景分析

Droplet Pub Date : 2025-03-05 DOI: 10.1002/dro2.165

Yifan He, Wenshuai Xu, Kuo Yan, Lingling Zhao, Jun Wang, Kai Li, Jingyuan Liu, Heng Jiang

{"title":"Liquid directional transport surface applied to the spacecraft fluid management system: Fundamentals and prospect analysis","authors":"Yifan He, Wenshuai Xu, Kuo Yan, Lingling Zhao, Jun Wang, Kai Li, Jingyuan Liu, Heng Jiang","doi":"10.1002/dro2.165","DOIUrl":"https://doi.org/10.1002/dro2.165","url":null,"abstract":"Liquid directional transport surfaces have the ability to control the movement of liquids in specific directions, making them highly applicable in various fields such as heat transfer, fluid management, microfluidics, and chemical engineering. This review aims to summarize the research progress on liquid directional transport surfaces and spacecraft fluid management devices. Among the different liquid control technologies available, certain surface design methods based on principles of fluid dynamics under microgravity show remarkable potential for space fluid management. Precise fluid management is crucial for the in-orbit operation of spacecraft. Utilizing surface tension effects represents the most direct and effective approach to achieve directional liquid transport in space. The intrinsic flow characteristics of the two-dimensional plane of directional transport surfaces are advantageous for managing fluids in the confined spaces of spacecraft. By analyzing the functional characteristics of these liquid directional transport surfaces, we assess their feasibility for integration into spacecraft fluid management devices. Considering the features of the space environment, this review also provides design guidelines for liquid directional transport surfaces suitable for use in spacecraft fluid management devices, serving as a significant reference for future research.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.165","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865912","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}

引用次数: 0

Advancements in liquid marbles as an open microfluidic platform: Rapid formation, robust manipulation, and revolutionary applications 液体弹珠作为开放微流控平台的进展：快速形成、稳健操作和革命性应用

Droplet Pub Date : 2025-02-18 DOI: 10.1002/dro2.160

Tong Tong, Huaiqing Hu, Yuanhao Xie, Jing Jin

{"title":"Advancements in liquid marbles as an open microfluidic platform: Rapid formation, robust manipulation, and revolutionary applications","authors":"Tong Tong, Huaiqing Hu, Yuanhao Xie, Jing Jin","doi":"10.1002/dro2.160","DOIUrl":"https://doi.org/10.1002/dro2.160","url":null,"abstract":"Liquid marbles (LMs) have become a focal point in microfluidics for their efficient manipulation of small liquid volumes. These non-wetting droplets, typically coated with hydrophobic particles, offer enhanced stability, reduced evaporation and diverse utility, distinguishing them from bare droplets. This review examines advancements in LMs from 2014 to 2024, focusing on their rapid formation, robust manipulation, and revolutionary applications—termed the “3R trilogy.” We delve into the generation mechanisms, analyzing laboratory and engineering production techniques, and explore how surface particles affect LMs’ physicochemical properties. The structural dynamics and motion control of LMs are investigated, detailing their response to external forces and environmental factors. The review also highlights the state-of-the-art applications of LMs in digital microfluidics, biochemical analysis, materials synthesis, environmental monitoring, soft robotics, and energy harvesting. Concluding with a discussion on significant progress and future development trends, this review provides insights and ideas for broader applications of LM-based microfluidic platforms.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.160","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865837","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}

引用次数: 0