Droplet最新文献 - Book学术

Front Cover, Volume 3, Number 4, October 2024 封面，第 3 卷第 4 号，2024 年 10 月

Droplet Pub Date : 2024-10-23 DOI: 10.1002/dro2.154

Chuanning Zhao, Youngjoon Suh, Yoonjin Won

引用次数: 0

Inside Back Cover, Volume 3, Number 4, October 2024 封底内页，第 3 卷第 4 号，2024 年 10 月

Droplet Pub Date : 2024-10-23 DOI: 10.1002/dro2.157

Zhi Tao, Weidong Fang, Haiwang Li, Shuai Yin, Tiantong Xu, Teckneng Wong, Yi Huang

引用次数: 0

Inside Front Cover, Volume 3, Number 4, October 2024 封面内页，第 3 卷第 4 号，2024 年 10 月

Droplet Pub Date : 2024-10-23 DOI: 10.1002/dro2.156

Ratima Suntornnond, Wei Long Ng, Viktor Shkolnikov, Wai Yee Yeong

引用次数: 0

Back Cover, Volume 3, Number 4, October 2024 封底，第 3 卷第 4 号，2024 年 10 月

Droplet Pub Date : 2024-10-23 DOI: 10.1002/dro2.155

Shile Feng, Yongping Hou, Yongmei Zheng

引用次数: 0

Aerodynamic breakup of emulsion droplets in airflow 气流中乳化液液滴的气动破碎

Droplet Pub Date : 2024-09-24 DOI: 10.1002/dro2.146

Zhikun Xu, Jinzhao Liu, Houpeng Zhang, Tianyou Wang, Zhizhao Che

{"title":"Aerodynamic breakup of emulsion droplets in airflow","authors":"Zhikun Xu, Jinzhao Liu, Houpeng Zhang, Tianyou Wang, Zhizhao Che","doi":"10.1002/dro2.146","DOIUrl":"https://doi.org/10.1002/dro2.146","url":null,"abstract":"Aerodynamic breakup refers to the process where large droplets are fragmented into small droplets by the aerodynamic force in airflow, which plays a vital role in fluid atomization and spray applications. Previous research has primarily concentrated on the aerodynamic breakup of single-component droplets, but investigations into the breakup of emulsion droplets are limited. This study experimentally investigated the aerodynamic breakup of water-in-oil emulsions in airflow, utilizing high-speed photography to observe the breakup process and digital in-line holography to measure fragment sizes. Comparative analyses between emulsion droplets and single-component droplets are conducted to examine the breakup morphology, breakup regime, deformation characteristics, and fragment size distributions. The emulsion droplets exhibit higher apparent viscosity and shorter stretching lengths of the bag film and peripheral rim due to the presence of a dispersed phase. The breakup regime transitions of emulsions are modeled by integrating the viscosity model of emulsions and the transition model of the pure fluid. The fragment sizes of emulsion droplets are larger due to the shorter lengths of the bag film and peripheral rim.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.146","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555364","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

Electro-coalescence of heterogeneous paired-droplets under AC electric field 交流电场下异质成对液滴的电凝聚

Droplet Pub Date : 2024-09-13 DOI: 10.1002/dro2.145

Zhi Tao, Weidong Fang, Haiwang Li, Shuai Yin, Tiantong Xu, Teckneng Wong, Yi Huang

{"title":"Electro-coalescence of heterogeneous paired-droplets under AC electric field","authors":"Zhi Tao, Weidong Fang, Haiwang Li, Shuai Yin, Tiantong Xu, Teckneng Wong, Yi Huang","doi":"10.1002/dro2.145","DOIUrl":"https://doi.org/10.1002/dro2.145","url":null,"abstract":"Controllable droplet coalescence exhibits unique advantages and intriguing prospect in chemical synthesis and biological engineering. Current researches focusing on the droplets of the same physics are, however, limited in terms of the interaction between different reactants. In this work, the electro-coalescence of heterogeneous paired-droplets is investigated in a microfluidic chip controlled by an AC electric field. The characteristics of merging dynamics are analyzed under different electric conditions and fluid properties, and an on-chip cross-linking reaction is conducted to enable the instantaneous production of hydrogel microspheres. We find that the coalescence of heterogeneous paired-droplets expands the range of start positions and prolongs the merging time compared to homogeneous paired-droplets. The evolution process of interfaces is accelerated with the increasing voltage, which contributes to the mixing of diverse components. Different electrical conductivities lead to distinct internal mechanisms within droplets. The voltage across the droplet is reduced with the increasing conductivity, while the enhanced attraction between free charges plays a complimentary role in interface instability. Lowering the surface tension reduced the required electric conditions for coalescence. Endowed with the non-Newtonian property, the droplet presents a non-linear relationship in the coalescence region, triggering coalescence with filaments at low voltages and showcasing superior performance at high frequencies. Based on above findings, we successfully produce alginate hydrogel microspheres with a wide range of concentrations in high monodispersity, achieving a clean fabrication of pure hydrogel without any additives and no need for subsequent cleaning. These results reveal the electro-hydrodynamics of heterogeneous paired-droplets, promoting the development of droplet coalescence in chemical and material science.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.145","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555351","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

DropletMask: Leveraging visual data for droplet impact analysis DropletMask：利用可视化数据进行液滴影响分析

Droplet Pub Date : 2024-09-03 DOI: 10.1002/dro2.137

Chuanning Zhao, Youngjoon Suh, Yoonjin Won

引用次数: 0

A facile method to fabricate cell-laden hydrogel microparticles of tunable sizes using thermal inkjet bioprinting 利用热喷墨生物打印技术制造尺寸可调的细胞负载水凝胶微颗粒的简便方法

Droplet Pub Date : 2024-08-28 DOI: 10.1002/dro2.144

Ratima Suntornnond, Wei Long Ng, Viktor Shkolnikov, Wai Yee Yeong

{"title":"A facile method to fabricate cell-laden hydrogel microparticles of tunable sizes using thermal inkjet bioprinting","authors":"Ratima Suntornnond, Wei Long Ng, Viktor Shkolnikov, Wai Yee Yeong","doi":"10.1002/dro2.144","DOIUrl":"https://doi.org/10.1002/dro2.144","url":null,"abstract":"This study investigates the application of a drop-on-demand (DOD) thermal inkjet (TIJ)-based bioprinting system for the fabrication of cell-laden hydrogel microparticles (HMPs) with tunable sizes. The TIJ bioprinting technique involves the formation of vapor bubbles within the print chamber through thermal energy, expelling small droplets of bio-ink onto a substrate. The study employs a heat-treated saponified gelatin-based bio-ink, HSP-GelMA. This bio-ink is modified through methacrylic anhydride functionalization and undergoes subsequent saponification and heat treatment processes. Various concentrations of SPAN 80 surfactant in mineral oil were evaluated to assess their influence on HMP size and stability. The results indicate a direct correlation, with higher SPAN 80 concentrations resulting in smaller and more stable HMPs. The study further investigates the influence of jetting volume on HMP size distribution, revealing that larger jetting volumes lead to increased HMP sizes, attributed to droplet coalescence. This is supported by our further study via a Monte Carlo simulation, which shows that the mean droplet diameter grows approximately linear with the number of dispensed droplets. In addition, the study demonstrates the capability of the TIJ bioprinting system to achieve multimaterial encapsulation within HMPs, exemplified by staining living cells with distinct cytoplasmic membrane dyes. The presented approach provides insights into the controlled fabrication of cell-laden HMPs, highlighting the versatility of the TIJ bioprinting system for potential applications in tissue engineering and drug delivery.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.144","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555429","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

Skin supersolidity matters the performance and functionality of water droplets 皮肤超固态影响水滴的性能和功能

Droplet Pub Date : 2024-08-24 DOI: 10.1002/dro2.139

Chang Q. Sun, Yong Zhou, Hengxin Fang, Biao Wang

{"title":"Skin supersolidity matters the performance and functionality of water droplets","authors":"Chang Q. Sun, Yong Zhou, Hengxin Fang, Biao Wang","doi":"10.1002/dro2.139","DOIUrl":"https://doi.org/10.1002/dro2.139","url":null,"abstract":"Even more fascinating than its bulk parent, a water droplet possesses extraordinary catalytic and hydro-voltaic capability, elastic adaptivity, hydrophobicity, sensitivity, thermal stability, etc., but the underlying mechanism is still elusive. We emphasize herewith that the H‒O bond follows the universal bond order‒length‒strength correlation and nonbonding electron polarization regulation and the hydrogen bond cooperativity and polarizability notion regulates the performance of the coupling hydrogen bond (O:H‒O). Computational and spectrometric evidence consistently shows that molecular undercoordination shortens the intramolecular H‒O bond by up to 10% while lengthening the intermolecular O:H nonbond by 20% cooperatively with an association of electron polarization, making the 0.3-nm thick droplet skin of a supersolid phase of self-electrification. The supersolid skin dictates the performance and functionality of the droplet in chemical, dielectric, electrical, mechanical, optical, and thermal properties as well as the transport dynamics of electrons and phonons. The amplification of these findings could deepen our insight into the undercoordinated aqueous systems, including bubbles and molecular clusters, and promote deep engineering of water and ice.","PeriodicalId":100381,"journal":{"name":"Droplet","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dro2.139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555407","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

Programmable curvilinear self-propelling of droplets without preset channels 可编程曲线自推进液滴，无需预设通道

Droplet Pub Date : 2024-08-20 DOI: 10.1002/dro2.138

Shile Feng, Yongping Hou, Yongmei Zheng

引用次数: 0