Self-assembly of spherical Janus particles in electrolytes

被引:31
作者
Moghani, Mahdy Malekzadeh [1 ,2 ]
Khomami, Bamin [1 ,2 ]
机构
[1] Univ Tennessee, SEERC, Knoxville, TN 37996 USA
[2] Univ Tennessee, MRAIL, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA
关键词
D O I
10.1039/c3sm27345h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Experimental studies on nano- and micrometer sized Janus particles (JPs) have demonstrated a plethora of simple and complex self-assembled structures. In this study, molecular dynamics simulations that include long range Coulombic interaction have been utilized to elucidate the underlying physics of self-assembly of nano-scale spherical bipolar JPs as a function of surface charge density, salt concentration and particle size. Specifically, two distinct sub-structures at low JP concentration, namely, strings and rings have been identified. As the concentration of JPs is increased these sub-structures join and/or hierarchically assemble into larger porous clusters. Moreover, it has been demonstrated that surface charge defects lead to precipitous loss of directional self-assembly. Finally, a direct connection between the ionic cloud around a single JP and the self-assembled structure morphology has been demonstrated. Overall, the results of this study should pave the way for future coordinated experimental/computational studies towards development of a mechanistic understanding of morphology development in this class of material.
引用
收藏
页码:4815 / 4821
页数:7
相关论文
共 17 条
[11]   Janus particles at an oil-water interface [J].
Park, Bum Jun ;
Brugarolas, Teresa ;
Lee, Daeyeon .
SOFT MATTER, 2011, 7 (14) :6413-6417
[12]   FAST PARALLEL ALGORITHMS FOR SHORT-RANGE MOLECULAR-DYNAMICS [J].
PLIMPTON, S .
JOURNAL OF COMPUTATIONAL PHYSICS, 1995, 117 (01) :1-19
[13]   Assembly Behavior of Iron Oxide-Capped Janus Particles in a Magnetic Field [J].
Ren, Bin ;
Ruditskiy, Aleksey ;
Song, Jung Hun ;
Kretzschmar, Ilona .
LANGMUIR, 2012, 28 (02) :1149-1156
[14]   Phase Diagram of Janus Particles [J].
Sciortino, Francesco ;
Giacometti, Achille ;
Pastore, Giorgio .
PHYSICAL REVIEW LETTERS, 2009, 103 (23)
[15]   Janus microgels prepared by surfactant-free pickering emulsion-based modification and their self-assembly [J].
Suzuki, Daisuke ;
Tsuji, Sakiko ;
Kawaguchi, Haruma .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2007, 129 (26) :8088-+
[16]   Structure and design of polymeric surfactant-based drug delivery systems [J].
Torchilin, VP .
JOURNAL OF CONTROLLED RELEASE, 2001, 73 (2-3) :137-172
[17]   Controlled Assembly of Janus Nanoparticles [J].
Xu, Qiao ;
Kang, Xiongwu ;
Bogomolni, Roberto A. ;
Chen, Shaowei .
LANGMUIR, 2010, 26 (18) :14923-14928