Shaojun Jiang, Dong Wu, Jiawen Li, Jiaru Chu, Yanlei Hu
{"title":"Frontispiece 2, Volume 3, Number 2, April 2024","authors":"Shaojun Jiang, Dong Wu, Jiawen Li, Jiaru Chu, Yanlei Hu","doi":"10.1002/dro2.134","DOIUrl":"https://doi.org/10.1002/dro2.134","url":null,"abstract":"<p><b>Frontispiece 2</b>: The cover image is based on the Review Article <i>Magnetically responsive manipulation of droplets and bubbles</i> by Jiang et al.</p><p>Based on the merits of remote control, exceptional biocompatibility, and no need for complex circuits, magnetically responsive manipulation of droplets/bubbles has a wide range of application potential in biomedical, microchemistry, analytical detection, and so on. This review provides a comprehensive and systematic overview of the current state of the art of the magnetically responsive manipulation of droplets and bubbles. (DOI: 10.1002/dro2.117)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556363","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":"Front Cover, Volume 3, Number 2, April 2024","authors":"Xiaoliang Ji, Wenxuan Zhong, Kangqi Liu, Yichen Jiang, Hongyue Chen, Wei Zhao, Duyang Zang","doi":"10.1002/dro2.126","DOIUrl":"https://doi.org/10.1002/dro2.126","url":null,"abstract":"<p><b>Front Cover</b>: The cover image is based on the Research Article <i>Extraordinary stability of surfactant-free bubbles suspended in ultrasound</i> by Ji et al.</p><p>By using ultrasonic levitation, the suspending bubble exhibits extraordinary stability against liquid drainage, thus achieving significantly prolonged bubble life which resembles that aboard the space station. (DOI: 10.1002/dro2.119)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.126","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556372","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}
Yuyang Wang, Zecong Fang, Sen Li, Kexin Lin, Zhifeng Zhang, Junyi Chen, Tingrui Pan
{"title":"Back Cover, Volume 3, Number 2, April 2024","authors":"Yuyang Wang, Zecong Fang, Sen Li, Kexin Lin, Zhifeng Zhang, Junyi Chen, Tingrui Pan","doi":"10.1002/dro2.127","DOIUrl":"https://doi.org/10.1002/dro2.127","url":null,"abstract":"<p><b>Back Cover</b>: The cover image is based on the Research Article <i>Droplet Laplace valve-enabled glaucoma implant for intraocular pressure management</i> by Wang et al.</p><p>This cover image depicts an innovative moving-parts-free microvalve with customizable and consistent threshold valving pressures for the treatment of refractory glaucoma. Operating on the principle of capillarity-driven flow discretization, it showcases a simple design with a droplet-generation nozzle and collecting reservoir. Such technology holds great promise for glaucoma implants and other microsystems that require a passive yet highly reliable microvalve. (DOI: 10.1002/dro2.109)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556359","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 3, Number 2, April 2024","authors":"Jonathan B. Boreyko","doi":"10.1002/dro2.129","DOIUrl":"https://doi.org/10.1002/dro2.129","url":null,"abstract":"<p><b>Inside Back Cover</b>: The cover image is based on the Review Article <i>Jumping droplets</i> by Boreyko.</p><p>This cover image depicts dew droplets spontaneously jumping from a wheat leaf upon coalescence. The corresponding review covers the historical development of capillary-inertial jumping droplets, details the enabling mechanisms of droplet inflation (pre-coalescence) and energy conversion via symmetry breaking (during coalescence), and presents 15 variations on a theme of jumping. (DOI: 10.1002/dro2.105)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.129","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556361","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 3, Number 2, April 2024","authors":"Shengping Zhang, Ruiyang Song, Haiou Zeng, Ningran Wu, Hongwei Duan, Luda Wang","doi":"10.1002/dro2.128","DOIUrl":"https://doi.org/10.1002/dro2.128","url":null,"abstract":"<p><b>Inside Front Cover</b>: The cover image is based on the Review Article <i>Exploring anomalous nanofluidic transport at the interfaces</i> by Zhang et al.</p><p>Interactions between interfaces are amplified, and many anomalous nanofluidic phenomena appear as the dimension approaches the nanoscale. This review summarizes three crucial interfaces governing nanofluidic transport, namely liquid-gas, liquid-solid, and liquid-liquid interfaces, and discusses related transport behaviors in detail. This review could inspire the manipulation of nanofluidics and provide promising opportunities for practical applications. (DOI: 10.1002/dro2.110)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556360","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":"Frontispiece 1, Volume 3, Number 2, April 2024","authors":"Chuchen Yue, Qingwen Dai, Xiaolong Yang, Carsten Gachot, Wei Huang, Xiaolei Wang","doi":"10.1002/dro2.130","DOIUrl":"https://doi.org/10.1002/dro2.130","url":null,"abstract":"<p><b>Frontispiece 1</b>: The cover image is based on the Research Article <i>Controllable self-transport of bouncing droplets on ultraslippery surfaces with wedgeshaped grooves</i> by Yue et al.</p><p>Inspired by Nepenthes, liquid-infused porous surfaces (SLIPS) with wedge-shaped grooves are designed for bouncing droplets self-transport control, the energy changing and self-transporting mechanism are revealed, and a new strategy for droplets manipulation is proposed. (DOI: 10.1002/dro2.118)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.130","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556362","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}
Shaojun Jiang, Dong Wu, Jiawen Li, Jiaru Chu, Yanlei Hu
{"title":"Magnetically responsive manipulation of droplets and bubbles","authors":"Shaojun Jiang, Dong Wu, Jiawen Li, Jiaru Chu, Yanlei Hu","doi":"10.1002/dro2.117","DOIUrl":"10.1002/dro2.117","url":null,"abstract":"<p>Droplets and bubbles have a wide range of applications in industry, agriculture, and daily life, and their controllable manipulation is of significant scientific and technological importance. Versatile magnetically responsive manipulation strategies have been developed to achieve precise control over droplets and bubbles. To manipulate nonmagnetic droplets or bubbles with magnetic fields, the presence of magnetic medium is indispensable. Magnetic additives can be added to the surface or interior of droplets and bubbles, allowing for on-demand manipulation by direct magnetic actuation. Alternatively, magnetically responsive elastomer substrates can be used to actuate droplets and bubbles by controlling the deformation of microstructures on the substrates through magnetic stimulation. Another strategy is based on untethered magnetic devices, which enables free mobility, facilitating versatile manipulation of droplets and bubbles in a flexible manner. This paper reviews the advances in magnetically responsive manipulation strategies from the perspective of droplets and bubbles. An overview of the different classes of magnetic medium, along with their respective corresponding droplet/bubble manipulation methods and principles, is first introduced. Then, the applications of droplet/bubble manipulation in biomedicine, microchemistry, and other fields are presented. Finally, the remaining challenges and future opportunities related to regulating droplet/bubble behavior using magnetic fields are discussed.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140381446","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":"Long-lived yet bare bubbles in ultrasound","authors":"Jie Feng, Zhengyu Yang","doi":"10.1002/dro2.120","DOIUrl":"https://doi.org/10.1002/dro2.120","url":null,"abstract":"<p>A bare water bubble, without the stabilization of any surfactant, can remain intact for more than 7 min in ultrasound. By contrast, once the sound power is turned off, the bubble will burst within several seconds. Scale bar = 1 mm. The figure is reproduced from fig. 1b in the article by Xiaoliang Ji et al. published in <i>Droplet</i> (https://doi.org/10.1002/dro2.119).\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.120","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140556217","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":"Controllable self-transport of bouncing droplets on ultraslippery surfaces with wedge-shaped grooves","authors":"Chuchen Yue, Qingwen Dai, Xiaolong Yang, Carsten Gachot, Wei Huang, Xiaolei Wang","doi":"10.1002/dro2.118","DOIUrl":"10.1002/dro2.118","url":null,"abstract":"<p>Preventing the accretion of droplets on surfaces is vital and slippery liquid-infused porous surfaces (SLIPS) have promising application prospects, such as surface self-cleaning and droplet transportation. In this work, controllable self-transport of bouncing droplets on ultraslippery surfaces with wedge-shaped grooves is reported. The impact behaviors of droplets on SLIPS under various impact velocities and diameters are explored, which can be classified as hover, total bounce, partial bounce, Worthington jet, and crush. SLIPS with wedge-shaped grooves were designed to transport accreted droplets. An energy and transport model is established to explain the impact and self-transport mechanism, where the Laplace pressure and moving resistance between droplets play a key role. Finally, SLIPS with branched wedge-shaped grooves were designed for droplet self-transport and demonstrated advantages. This work provides a general reference for spontaneous motion control of sessile droplets, droplets with initial impacting velocity, or even liquid films.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140214532","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":"Extraordinary stability of surfactant-free bubbles suspended in ultrasound","authors":"Xiaoliang Ji, Wenxuan Zhong, Kangqi Liu, Yichen Jiang, Hongyue Chen, Wei Zhao, Duyang Zang","doi":"10.1002/dro2.119","DOIUrl":"10.1002/dro2.119","url":null,"abstract":"<p>Gravity-induced drainage is one of the main destabilizing mechanisms for soap bubbles and foams. Here we show that solely through acoustic levitation without introducing any chemical stabilizers, liquid drainage in the bubble film can be completely inhibited, therefore leading to a significant enhancement of bubble lifetime by more than two orders of magnitude and enabling the bubble to survive puncturing by a needle. Based on sound simulation and force analysis, it has been found that acoustic radiation force, exerted on both the inner and outer surfaces of the levitated bubble, acts in opposite directions, thus providing a squeezing effect to the bubble film. The hydrostatic pressure that induces drainage has been balanced by the acoustic radiation pressure exerted on both sides of the film, which is at the origin of the sound stabilization mechanism. This study provides new insights into the interplay between sound and soap bubbles or films, thus stimulating a wide range of fundamental research concerning bubble films and expanding their applications in bio/chemical reactors.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.119","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140228499","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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