Droplet最新文献_第7页

Hydrodynamic metamaterials: Principles, experiments, and applications 流体力学超材料：原理、实验和应用

Droplet Pub Date : 2023-09-19 DOI: 10.1002/dro2.79

Mengyao Chen, Xiangying Shen, Lei Xu

引用次数: 0

Building block copolymer particles via self-assembly within a droplet 通过液滴内的自组装构建嵌段共聚物颗粒

Droplet Pub Date : 2023-09-06 DOI: 10.1002/dro2.81

Sen Zhang, Han Bao, Xinyi Shen, Yongyang Song, Shutao Wang

{"title":"Building block copolymer particles via self-assembly within a droplet","authors":"Sen Zhang, Han Bao, Xinyi Shen, Yongyang Song, Shutao Wang","doi":"10.1002/dro2.81","DOIUrl":"https://doi.org/10.1002/dro2.81","url":null,"abstract":"The self-assembly of block copolymers (BCPs) within emulsion droplets is a flexible strategy for the preparation of polymer particles. This strategy permits the fine-tuning of shapes, internal structures, and surface nanostructures of the polymer particles, thus allowing many applications. Although some literature has reviewed the BCP preparation via self-assembly within a droplet, a comprehensive summary including in-depth understanding, controllable preparation, and application is lacked. In this review, we systematically delve into the multiple mechanisms that drive BCP self-assembly within emulsion droplets, such as commensurability effects for minimizing total free energy, interfacial instability, organized spontaneous emulsification, phase separation of multiple components, and entropy effects between BCPs and nanoparticles. Additionally, a strategy combining selective cross-linking and disassembly can further generate Janus particles featuring unique structures. Next, various applications across multiple disciplines are discussed, including drug delivery, display, biomedical imaging, macromolecular separation, and fuel cells. Finally, we present an overview of the current challenges and future directions for BCP emulsion self-assembly, covering mechanism investigation, molecular design, stability control, and application exploration. We anticipate deeper understanding, more varieties, enhanced performance, and broader applications can be achieved with BCP emulsion self-assembly after addressing the challenge.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.81","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50123097","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 encapsulation in a freezing sessile drop 冷冻无柄液滴中的液体封装

Droplet Pub Date : 2023-08-29 DOI: 10.1002/dro2.90

Sijia Lyu, Xun Zhu, Dominique Legendre, Chao Sun

引用次数: 0

New insights into the interactions between two-dimensional ice and two-dimensional materials 对二维冰和二维材料之间相互作用的新见解

Droplet Pub Date : 2023-08-28 DOI: 10.1002/dro2.88

Quoc Huy Thi, Jiong Zhao, Thuc Hue Ly

{"title":"New insights into the interactions between two-dimensional ice and two-dimensional materials","authors":"Quoc Huy Thi, Jiong Zhao, Thuc Hue Ly","doi":"10.1002/dro2.88","DOIUrl":"https://doi.org/10.1002/dro2.88","url":null,"abstract":"Water is one of the most essential substances for life on Earth and plays a vital role in both natural and technological processes. Recently, there has been growing interest in studying the behavior of water molecules in confined spaces, particularly in low-dimensional materials and structures. Regardless of whether it is in the form of gas, liquid, or solid, water can interact and form interfaces with many low-dimensional structures. Given the current controversial understanding of two-dimensional (2D) ice and the increasing interplay between water/ice and 2D materials such as graphene and transition-metal dichalcogenides, we provide a brief overview of recent progresses on the interfaces of 2D ice and 2D van der Waals layered materials. This review highlights their potential contributions to the breakthroughs in tribology, membrane technology, nanofluidic, and nanodevice applications. Of particular interest is the recent discovery of ultrahigh lubricity between 2D ice and 2D layered materials, as well as the ability to modulate the surface adhesion between layers. These findings have the potential to enable new technological advances in both electronics and various industries. Meanwhile, this rapidly evolving field presents its own challenges, and we also discuss future directions for exploiting the interactions between 2D ice and 2D layered materials.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.88","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50146205","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

Two modes of contact-time reduction in the impact of particle-coated droplets on superhydrophobic surfaces 颗粒涂层液滴在超疏水表面上冲击的两种接触时间缩短模式

Droplet Pub Date : 2023-08-28 DOI: 10.1002/dro2.89

Rutvik Lathia, Chandantaru D. Modak, Prosenjit Sen

{"title":"Two modes of contact-time reduction in the impact of particle-coated droplets on superhydrophobic surfaces","authors":"Rutvik Lathia, Chandantaru D. Modak, Prosenjit Sen","doi":"10.1002/dro2.89","DOIUrl":"https://doi.org/10.1002/dro2.89","url":null,"abstract":"Reducing the contact time during droplet impact is essential for many scientific and industrial applications, such as self-cleaning, anti-icing, heat transfer, and condensation. This paper reports contact-time reduction by coating droplets with micro–nano hydrophobic particles. Such particle-coated droplets are known as liquid marbles (LM). LM impact on superhydrophobic surfaces reveals two different modes of contact-time reduction. For lower impact energies, the reduced adhesion of LM with the surface is responsible for a reduction of up to 21%. Contact-time reduction in this regime is found to be independent of particle size but dependent on the solid fraction of LM. However, a fragmentation-based contact-time reduction is observed for larger particle sizes and higher impact energies. Here, the reduction is as high as 65%. Such fragmentation occurs because the spreading LM lamella breaks when its thickness becomes similar to particle dimensions. Our findings reveal the potential of LM as a novel approach to reduce contact time during droplet impact, with implications for various scientific and industrial applications.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.89","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50146208","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: 1

Hydrophilic solvent recovery from switched-on microdroplet dissolution 从开启的微滴溶解中回收亲水溶剂

Droplet Pub Date : 2023-08-28 DOI: 10.1002/dro2.82

Romain Billet, Binglin Zeng, Hongyan Wu, James Lockhart, Mike Gattrell, Hongying Zhao, Xuehua Zhang

{"title":"Hydrophilic solvent recovery from switched-on microdroplet dissolution","authors":"Romain Billet, Binglin Zeng, Hongyan Wu, James Lockhart, Mike Gattrell, Hongying Zhao, Xuehua Zhang","doi":"10.1002/dro2.82","DOIUrl":"https://doi.org/10.1002/dro2.82","url":null,"abstract":"Switchable hydrophilicity solvents (SHSs) are a unique class of chemical compounds that can be switched between their hydrophobic and hydrophilic forms. The switchable characteristics allow SHSs to be used as emerging, green solvents for sustainable extraction and separation technology. In the production of polymeric microparticles from recycled plastics, SHSs are used to dissolve the polymer and then are switched to the hydrophilic form for separation from the generated polymeric microparticles. However, it is extremely difficult to fully recover the SHS residue from the mixtures. In this work, we will identify the key parameters that determine the level of the solvent residue during the switched-on dissolution of emulsion microdroplets. The SHS N,N-dimethylcyclohexylamine from solvent–polymer binary emulsion droplets was switched to the hydrophilic, water-soluble form, triggered by addition of an acid in the surrounding aqueous phase. By applying a sensitive detection method developed in this work, we compared the levels of SHS residue in polymer microparticles obtained under 30 different dynamical and chemical conditions for the switching processes. The quantitative analysis revealed that residue levels remained constant at varied addition rates and concentration of the trigger solution, but decreased with the increase in organic phase fractions or the decrease in the emulsion temperature. Trapped water in the drops during switched-on dissolution may have contributed to the high level of solvent residue. The understanding of the new possible mechanism for residual solvent reported in this work may help develop effective approaches for the recovery of switchable solvents in environmentally friendly separation processes.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.82","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50146207","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: 1

Material assembly by droplet drying: From mechanics theories to applications 液滴干燥组装材料：从力学理论到应用

Droplet Pub Date : 2023-08-08 DOI: 10.1002/dro2.76

Ziyu Chen, Kangyi Peng, Baoxing Xu

{"title":"Material assembly by droplet drying: From mechanics theories to applications","authors":"Ziyu Chen, Kangyi Peng, Baoxing Xu","doi":"10.1002/dro2.76","DOIUrl":"https://doi.org/10.1002/dro2.76","url":null,"abstract":"Evaporation of droplets composed of insoluble materials provides a low-cost and facile route for assembling materials and structures in a wide spectrum of functionalities down to the nanoscale and also serves as a basis for innovating ink-solution-based future manufacturing technologies. This review summarizes the fundamental mechanics theories of material assembly by droplet drying both on solid and liquid substrates and in a fully suspended air environment. The evolution of assembly patterns, material deformation, and liquid flow during droplet drying and its response to external stimuli ranging from solution surfactant and pH value, surface geometric pattern and wettability, drying temperature, pressure environment, to electrical field have been highlighted to elucidate the coupling mechanisms between solid materials and liquid solutions and the manipulation strategies for material assembly through an either active or passive means. The recent progresses in ink-based printing technologies with selected examples are also presented to illustrate the immediate applications of droplet drying, with a focus on printing electronic sensors and biomedical devices. The remaining challenges and emerging opportunities are discussed.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.76","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50124487","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

Identification of metal–air batteries from water energy harvesters 从水能采集器中鉴定金属-空气电池

Droplet Pub Date : 2023-08-08 DOI: 10.1002/dro2.80

Xiaote Xu, Xiaodan Yang, Zhuomin Zhang, Ying Hong, Shiyuan Liu, Yao Shan, Zehua Peng, Siyuan Wang, Xi Yao, Zhengbao Yang

引用次数: 1

Hydrovoltaic energy from water droplets: Device configurations, mechanisms, and applications 来自水滴的光伏能量：设备配置、机制和应用

Droplet Pub Date : 2023-08-01 DOI: 10.1002/dro2.77

Luxian Li, Xiang Wang, Wei Deng, Jun Yin, Xuemei Li, Wanlin Guo

引用次数: 0

Antitangling and manufacturable Fog Harps for high-efficiency water harvesting 防倾斜和可制造的雾耙，用于高效集水

Droplet Pub Date : 2023-08-01 DOI: 10.1002/dro2.78

Jimmy K. Kaindu, Kevin R. Murphy, Nicholas G. Kowalski, Alexandra N. Jones, Matthew Davis Fleming, Brook S. Kennedy, Jonathan B. Boreyko

{"title":"Antitangling and manufacturable Fog Harps for high-efficiency water harvesting","authors":"Jimmy K. Kaindu, Kevin R. Murphy, Nicholas G. Kowalski, Alexandra N. Jones, Matthew Davis Fleming, Brook S. Kennedy, Jonathan B. Boreyko","doi":"10.1002/dro2.78","DOIUrl":"https://doi.org/10.1002/dro2.78","url":null,"abstract":"Fog Harps harvest substantially more water than conventional mesh-based harvesters. However, to date, all large-scale Fog Harps have been impractically hand-wound at low wire tensions and suffer from elastocapillary wire tangling. Here, we develop large-scale and high-tension Fog Harps that are manufacturable and antitangling. These Fog Harps retain the record-setting fog harvesting efficiency (<math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>η</mi>\u0000 <mo>≈</mo>\u0000 <mn>17</mn>\u0000 </mrow>\u0000 <annotation> $eta approx 17$</annotation>\u0000 </semantics></math>%) of their optimized scale-model counterparts, while uniquely enabling practical real-life implementation. Manufacturability was achieved by adapting the industrial process for making harp screens, a pre-existing technology used for screening solid materials. The critical tension required to minimize wire tangling was rationalized by an improved elastocapillary tangling model.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.78","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50115462","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: 2