Droplet最新文献

{"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,&nbsp;Ruiyang Song,&nbsp;Haiou Zeng,&nbsp;Ningran Wu,&nbsp;Hongwei Duan,&nbsp;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,&nbsp;Qingwen Dai,&nbsp;Xiaolong Yang,&nbsp;Carsten Gachot,&nbsp;Wei Huang,&nbsp;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}

{"title":"Magnetically responsive manipulation of droplets and bubbles","authors":"Shaojun Jiang,&nbsp;Dong Wu,&nbsp;Jiawen Li,&nbsp;Jiaru Chu,&nbsp;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,&nbsp;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,&nbsp;Qingwen Dai,&nbsp;Xiaolong Yang,&nbsp;Carsten Gachot,&nbsp;Wei Huang,&nbsp;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,&nbsp;Wenxuan Zhong,&nbsp;Kangqi Liu,&nbsp;Yichen Jiang,&nbsp;Hongyue Chen,&nbsp;Wei Zhao,&nbsp;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}

{"title":"Droplet collision of hypergolic propellants","authors":"Chengming He,&nbsp;ZhiXia He,&nbsp;Peng Zhang","doi":"10.1002/dro2.116","DOIUrl":"10.1002/dro2.116","url":null,"abstract":"<p>In the present mini-review, droplet impacting on a liquid pool, jet impingement, and binary droplet collision of nonreacting liquids are first summarized in terms of basic phenomena and the corresponding nondimensional parameters. Then, two representative hypergolic bipropellant systems, a hypergolic fuel of <i>N,N,N′,N′</i>-tetramethylethylenediamine (TMEDA) and an oxidizer of white fuming nitric acid (WFNA) and a monoethanolamine-based fuel (MEA-NaBH₄) and a high-density hydrogen peroxide (H₂O₂), are discussed in detail to unveil the rich underlying physics such as liquid-phase reaction, heat transfer, phase change, and gas-phase reaction. This review focuses on quantifying and interpreting the parametric dependence of the gas-phase ignition induced by droplet collision of liquid hypergolic propellants. The advances in droplet collision of hypergolic propellants are important for modeling the real hypergolic impinging-jet (spray) combustion and for the design optimization of orbit-maneuver rocket engines.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140232554","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":"Jumping droplets","authors":"Jonathan B. Boreyko","doi":"10.1002/dro2.105","DOIUrl":"10.1002/dro2.105","url":null,"abstract":"<p>When microdroplets with quasi-spherical contact angles coalesce together on a low-adhesion substrate, the capillary-inertial expansion of the liquid bridge induces a dramatic out-of-plane jumping event due to symmetry breaking. From the onset of merging, droplet jumping initiates after a capillary-inertial time scale of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>t</mi>\u0000 \u0000 <mrow>\u0000 <mspace></mspace>\u0000 \u0000 <mtext>ci</mtext>\u0000 </mrow>\u0000 </msub>\u0000 \u0000 <mo>∼</mo>\u0000 \u0000 <mn>1</mn>\u0000 \u0000 <mo>–</mo>\u0000 <mspace></mspace>\u0000 \u0000 <mn>100</mn>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${t}_{text{ci}}sim 1mbox{--},100$</annotation>\u0000 </semantics></math> μs with characteristic jumping speeds of order <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>v</mi>\u0000 \u0000 <mi>j</mi>\u0000 </msub>\u0000 \u0000 <mo>∼</mo>\u0000 \u0000 <mn>0.1</mn>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${v}_{{rm{j}}}sim 0.1$</annotation>\u0000 </semantics></math> m/s. This coalescence-induced jumping-droplet effect is most commonly observed among a population of growing dew droplets on a superhydrophobic condenser, but can also occur by colliding deposited droplets together or during droplet sliding on fog harvesters. In this review, we cover the historical development of capillary-inertial jumping droplets, summarize the decade-long effort to rationalize the ultra-low energy conversion efficiency and critical droplet size of the phenomenon, and then present 15 variations on a theme of jumping. Capillary-inertial jumping droplets are not only a visceral illustration of the surprising power of surface tension at the microscale but they also have the potential to enhance phase-change heat transfer, enable self-cleaning surfaces, combat frost formation, harvest energy, and govern the rate of disease spread for wheat crops.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140237305","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":"Exploring anomalous nanofluidic transport at the interfaces","authors":"Shengping Zhang,&nbsp;Ruiyang Song,&nbsp;Haiou Zeng,&nbsp;Ningran Wu,&nbsp;Hongwei Duan,&nbsp;Luda Wang","doi":"10.1002/dro2.110","DOIUrl":"10.1002/dro2.110","url":null,"abstract":"<p>Transport of ions and water is essential for diverse physiological activities and industrial applications. As the dimension approaches nano and even angstrom scale, ions and water exhibit anomalous behaviors that differ significantly from the bulk. One of the key reasons for these distinctive behaviors is the prominent influence of surface effects and related transport properties occurring at the interface under such (sub)nanoconfinement. Therefore, exploring nanofluidic transport at the interfaces could not only contribute to unraveling the intriguing ion and water transport behaviors but also facilitate the development of nanofluidic devices with tunable mass transport for practical applications. In this review, we focus on three crucial interfaces governing ion and water transport, namely liquid–gas interface, liquid–solid interface, and liquid–liquid interface, with emphasis on elucidating their intricate interfacial structures and critical roles for nanofluidic transport phenomena. Additionally, potential applications associated with liquid–gas, liquid–solid, and liquid–liquid interfaces are also discussed. Finally, we present a perspective on the pivotal roles of interfaces on nanofluidics, as well as challenges in this advancing field.</p>","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140247145","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}