Article(id=1320176229567807530, tenantId=1146029695717560320, journalId=1301849854269554754, issueId=1320176147946648091, articleNumber=null, orderNo=null, doi=10.11729/syltlx20250126, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1767110400000, receivedDateStr=2025-12-31, revisedDate=1770825600000, revisedDateStr=2026-02-12, acceptedDate=1772640000000, acceptedDateStr=2026-03-05, onlineDate=1792684140816, onlineDateStr=2026-10-22, pubDate=1787587200000, pubDateStr=2026-08-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792684140816, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792684140816, creator=13701087609, updateTime=1792684140816, updator=13701087609, issue=Issue{id=1320176147946648091, tenantId=1146029695717560320, journalId=1301849854269554754, year='2026', volume='40', issue='4', pageStart='1', pageEnd='137', issueExtLink='null', onlineDate='null', pubDate='1787587200000', pubDateStr='2026-08-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1792684121357, creator='13701087609', updateTime=1792720571222, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320329029853495708, tenantId=1146029695717560320, journalId=1301849854269554754, issueId=1320176147946648091, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320329029853495709, tenantId=1146029695717560320, journalId=1301849854269554754, issueId=1320176147946648091, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=105, endPage=116, ext={EN=ArticleExt(id=1320176231715291179, articleId=1320176229567807530, tenantId=1146029695717560320, journalId=1301849854269554754, language=EN, title=Electro–elasto–microfluidic precisely tuned manipulation of particles regulated by polymer chain length, columnId=1320176148672262684, journalTitle=Journal of Experiments in Fluid Mechanics, columnName=Special Issue on Microscale and Nanoscale Flows, runingTitle=null, highlight=null, articleAbstract=
Electro–elasto–microfluidic technology integrates the high controllability of electric fields with the viscoelasticity of non-Newtonian fluids, representing a frontier approach for precise manipulation of particles at the micro- and nanoscale. However, existing studies have predominantly focused on macroscopic rheological properties and particle size effects, while the influence of microscopic rheological parameters—such as polymer chain length—on particle migration behavior remains insufficiently understood. In particular, the coupling mechanism between the polymer chain length and slip-velocity-induced lift has yet to be elucidated. In this study, an electro–elasto–microfluidic system with tunable viscoelastic parameters was designed, and a control strategy incorporating polymer chain-scale parameters was established to systematically investigate the effects of polymer solutions with different chain lengths and concentrations on the migration of nano- and microparticles. Experimental results demonstrate that the polymer chain length plays a critical role in regulating the lift force balance in electro–elasto–coupled systems. Numerical simulations further reveal that the polymer chain length significantly influences the particle slip velocity. The particle slip velocity Us exhibits an approximately linear dependence on the ratio between the force acting on the particle and its radius, Fp/R. With increasing polymer chain length, the slip velocity Us decreases monotonically under identical Fp/R conditions. Theoretical analysis indicates that, as particle size decreases, the flow-induced elastic lift decays much more rapidly than the slip-induced lift, causing the latter to dominate nanoparticle manipulation. Based on these findings, efficient nanoparticle focusing at prescribed flow velocities, as well as high-throughput continuous separation of particles spanning the nano- to microscale, were achieved by appropriately matching polymer chain length and concentration. This work not only elucidates the microscopic regulatory role of the polymer chain length—a key microrheological parameter—on macroscopic particle dynamics, but also provides a new theoretical foundation and design strategy for electro–elasto–synergistically driven microfluidic sorting technologies.
, authors=Xinlei Qi, Shuhao Ma, Guoqing Hu
*, authorsList=Xinlei Qi, Shuhao Ma, Guoqing Hu, authorCompany=null, correspAuthors=Guoqing Hu, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2026 Journal of Experiments in Fluid Mechanics. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1320176263554253013, articleId=1320176229567807530, tenantId=1146029695717560320, journalId=1301849854269554754, language=CN, title=聚合物链长调控的电场–弹性微流控颗粒精确操控机制研究, columnId=1320176148844229150, journalTitle=实验流体力学, columnName=微纳尺度流动专刊, runingTitle=null, highlight=null, articleAbstract=
电场–弹性微流控技术结合了电场的可控性与非牛顿流体的黏弹性,是微纳尺度颗粒精准操控的前沿方法。然而,现有研究多聚焦于宏观流变特性和颗粒尺寸效应,而聚合物链长等微观流变学参数对颗粒迁移行为的影响,特别是其与滑移速度诱导升力的耦合机制,尚不明确。本文设计了可调黏弹性参数的电场–弹性微流控系统,构建了包含聚合物链尺度参数的调控方案,研究了不同链长与质量分数的聚合物溶液对纳米及微米颗粒迁移行为的影响。实验结果显示,聚合物链长显著调控了电场–弹性耦合体系的升力平衡。结合数值模拟进一步表明,聚合物链长对颗粒滑移速度具有显著影响,颗粒滑移速度Us与施加在颗粒上的力和颗粒半径的比值Fp/R呈近似线性关系。随着聚合物链长的增加,在相同Fp/R条件下,滑移速度Us不断减小。理论分析表明,随着颗粒尺寸减小,流动诱导弹性升力的衰减速度远快于滑移诱导升力,使后者在纳米颗粒操控中占据主导地位。基于此规律,通过合理匹配聚合物链长与质量分数,实现了在特定流速下纳米颗粒的高效聚焦以及纳–微米尺度颗粒的高通量连续分离。该研究不仅揭示了微观流变学参数—聚合物链长对颗粒宏观动力学的微观调控机制,也为基于电场–弹性协同驱动的微流控分选技术提供了新的理论基础与设计策略。
, authors=綦新磊, 马淑浩, 胡国庆
*, authorsList=綦新磊, 马淑浩, 胡国庆, authorCompany=null, correspAuthors=胡国庆, authorNote=
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綦新磊(1996—),男,博士。研究方向:微纳流体力学。E-mail:xqi@zju.edu.cnxqi@zju.edu.cn
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綦新磊(1996—),男,博士。研究方向:微纳流体力学。E-mail:xqi@zju.edu.cnxqi@zju.edu.cn
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聚合物溶液中颗粒电场–弹性操控实验示意图, figureFileSmall=zTWy693pBh8ZEFkjpQZ1fA==, figureFileBig=ysiCoBDUSkQhSf1oPfJUtQ==, tableContent=null), ArticleFig(id=1320176358068695683, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.2, caption=
Measured shear viscosity of PEO solutions with different chain lengths and different concentrations, figureFileSmall=sju/OvpZDM+yPv+bmeqjsg==, figureFileBig=nwALFLzMGiXcTxXF3uv3ww==, tableContent=null), ArticleFig(id=1320176358127415940, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图2, caption=
不同质量分数、不同链长PEO溶液的测量剪切黏度, figureFileSmall=sju/OvpZDM+yPv+bmeqjsg==, figureFileBig=nwALFLzMGiXcTxXF3uv3ww==, tableContent=null), ArticleFig(id=1320176358186136197, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.3, caption=
Numerical simulation results of the slip velocity of particles with different sizes, figureFileSmall=EBAk2FCn6SSSdgoy4FIlOg==, figureFileBig=iqr1WKsbdJ/I7E/gAY3vtQ==, tableContent=null), ArticleFig(id=1320176358253245062, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图3, caption=
不同尺寸颗粒滑移速度数值模拟结果, figureFileSmall=EBAk2FCn6SSSdgoy4FIlOg==, figureFileBig=iqr1WKsbdJ/I7E/gAY3vtQ==, tableContent=null), ArticleFig(id=1320176358332936839, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.4, caption=
Comparison of lift force variations for particles of different sizes under low electric field strength, figureFileSmall=mIauqq5192aiXQPwG8kTew==, figureFileBig=IwipwvhOBfIIeIT0YyJdWg==, tableContent=null), ArticleFig(id=1320176358408434312, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图4, caption=
不同尺寸颗粒在低电场强度下的升力变化对比, figureFileSmall=mIauqq5192aiXQPwG8kTew==, figureFileBig=IwipwvhOBfIIeIT0YyJdWg==, tableContent=null), ArticleFig(id=1320176358475543177, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.5, caption=
Numerical simulation results of the particle slip velocity in polymer solutions with different chain lengths, figureFileSmall=D+PcsqYAb6xhQBEfRtV9YQ==, figureFileBig=RhWU06Y/gSQdaFR5HIdGuQ==, tableContent=null), ArticleFig(id=1320176358542652042, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图5, caption=
不同链长聚合物溶液中颗粒滑移速度数值模拟结果, figureFileSmall=D+PcsqYAb6xhQBEfRtV9YQ==, figureFileBig=RhWU06Y/gSQdaFR5HIdGuQ==, tableContent=null), ArticleFig(id=1320176358622343819, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.6, caption=
Differences in the migration behavior of 5 μm particles in PEO solutions with different chain lengths under the no-slip velocity condition, figureFileSmall=JDUasgfC4khoRAUmhKicnw==, figureFileBig=wBDV1OblV7ONfJI3E2Uygg==, tableContent=null), ArticleFig(id=1320176358693646988, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图6, caption=
5 μm颗粒无滑移速度条件下在不同链长PEO溶液中的迁移行为差异, figureFileSmall=JDUasgfC4khoRAUmhKicnw==, figureFileBig=wBDV1OblV7ONfJI3E2Uygg==, tableContent=null), ArticleFig(id=1320176358760755853, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.7, caption=
Fluorescence distribution of 100 nm particles in PEO solutions with different molecular weights at different flow rates under the no-slip velocity condition, figureFileSmall=cnF7Ig+6uQ6sRJ2vxyAVAg==, figureFileBig=+2JRTTD0aUCDZvhBISZWTA==, tableContent=null), ArticleFig(id=1320176358840447630, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图7, caption=
无滑移速度条件下,100 nm颗粒在不同分子量PEO溶液中不同流速下的荧光分布, figureFileSmall=cnF7Ig+6uQ6sRJ2vxyAVAg==, figureFileBig=+2JRTTD0aUCDZvhBISZWTA==, tableContent=null), ArticleFig(id=1320176358907556495, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.8, caption=
Differences in slip-induced focusing behavior of nanoparticles (100 nm) in PEO solutions with different chain lengths, figureFileSmall=lysnjXxRun6sk6GJqLJcMQ==, figureFileBig=r7Rhnw1a4V5l/t0wihXRgw==, tableContent=null), ArticleFig(id=1320176360534946448, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图8, caption=
纳米颗粒(100 nm)在不同链长PEO溶液中产生滑移的聚焦行为差异, figureFileSmall=lysnjXxRun6sk6GJqLJcMQ==, figureFileBig=r7Rhnw1a4V5l/t0wihXRgw==, tableContent=null), ArticleFig(id=1320176360606249617, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.9, caption=
Differences in slip-induced migration behavior of 5 μm particles in PEO solutions with different chain lengths, figureFileSmall=bUURQYUUHSvY4T+M9D0pBA==, figureFileBig=/TpW/F+BcF1UJJUoijJc6Q==, tableContent=null), ArticleFig(id=1320176360673358482, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图9, caption=
5 μm颗粒在不同链长PEO溶液中产生滑移的迁移行为差异, figureFileSmall=bUURQYUUHSvY4T+M9D0pBA==, figureFileBig=/TpW/F+BcF1UJJUoijJc6Q==, tableContent=null), ArticleFig(id=1320176360744661651, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.10, caption=
Experimental results of electro–elasto–microfluidic focusing of nanoparticles in mixed PEO solutions with different chain lengths, figureFileSmall=XEStVwZMWoYPffnOzNKpSw==, figureFileBig=vDlN51ufvy0bOob1Fk3XJQ==, tableContent=null), ArticleFig(id=1320176360941793940, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图10, caption=
不同链长PEO溶液混合的纳米颗粒电场–弹性微流控聚焦实验结果, figureFileSmall=XEStVwZMWoYPffnOzNKpSw==, figureFileBig=vDlN51ufvy0bOob1Fk3XJQ==, tableContent=null), ArticleFig(id=1320176361004708501, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Fig.11, caption=
High-throughput electro–elasto–microfluidic separation of micro- and nanoparticles, figureFileSmall=qdkhUvWgb8twlvZGgp4aoQ==, figureFileBig=siTqGg295ZM7e+xvcVP5gg==, tableContent=null), ArticleFig(id=1320176362938282646, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=图11, caption=
微纳颗粒电场–弹性微流控高通量分离实验, figureFileSmall=qdkhUvWgb8twlvZGgp4aoQ==, figureFileBig=siTqGg295ZM7e+xvcVP5gg==, tableContent=null), ArticleFig(id=1320176363005391511, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=EN, label=Table 1, caption=
Calculation of relaxation times for PEO solutions at different concentrations
, figureFileSmall=null, figureFileBig=null, tableContent=
| PEO分子量/kDa | c | c*/10−6 | c/c* | λz/ms | λ/ms |
|---|
| 600 | 0.2% | 1877 | 1.1 | 0.046 | 0.88 |
| 600 | 0.6% | 1877 | 3.2 | 0.046 | 1.76 |
| 2000 | 0.2% | 858 | 2.3 | 0.335 | 10.4 |
| 2000 | 0.6% | 858 | 7.0 | 0.335 | 21.4 |
| 4000 | 0.2% | 547 | 3.7 | 1.052 | 44.3 |
| 4000 | 0.6% | 547 | 11.0 | 1.052 | 90.0 |
), ArticleFig(id=1320176363068306072, tenantId=1146029695717560320, journalId=1301849854269554754, articleId=1320176229567807530, language=CN, label=表1, caption=
不同质量分数PEO溶液的松弛时间
, figureFileSmall=null, figureFileBig=null, tableContent=
| PEO分子量/kDa | c | c*/10−6 | c/c* | λz/ms | λ/ms |
|---|
| 600 | 0.2% | 1877 | 1.1 | 0.046 | 0.88 |
| 600 | 0.6% | 1877 | 3.2 | 0.046 | 1.76 |
| 2000 | 0.2% | 858 | 2.3 | 0.335 | 10.4 |
| 2000 | 0.6% | 858 | 7.0 | 0.335 | 21.4 |
| 4000 | 0.2% | 547 | 3.7 | 1.052 | 44.3 |
| 4000 | 0.6% | 547 | 11.0 | 1.052 | 90.0 |
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