Phase Structure of Aa Type of Patchy Colloids†

doi:10.7503/cjcu20170155

Abstract

Abstract:

Phase structure of A_a type of Patchy colloids was presented under various conditions by the principle of phase equilibrium, where the phases of fluid(F), random close packing(RCP) and face centered cubic(FCC) were investigated to give the corresponding phase diagrams for F-F, F-RCP and F-FCC transitions, as well as for the sol-gel transition. It is shown that the crystallization of the Patchy colloid at a relatively high temperature is subjected to a one-step nucleation mechanism, and at a relatively low temperature it is subjected to a two-step nucleation mechanism companied with a metastable glassy state. An attempt is made to illustrate how the association strength and the number of patches regulate the phase state of Patchy particles, in particular, for glassy and crystal states. As a result, a significant effect of the two factors on the critical temperature, triple point, critical density and phase structure were found. Moreover, a relationship between the sol-gel and F-F transitions was also considered.

Key words: Patchy colloid, Phase diagram, Random close packing, Sol-gel transition

CLC Number:

O631
O642

TrendMD:

LIU Shujing, LI Jiangtao, GU Fang, WANG Haijun. Phase Structure of A_a Type of Patchy Colloids^†[J]. Chem. J. Chinese Universities, 2017, 38(10): 1888.

Figures/Tables 10

Fig.1 Fitting curve of Madelung constant M6 for RCP phase based on the M6 of simple cubic(SC), body centered cubic(BCC) and face centered cubic(FCC)

Fig.2 Phase diagram of Patchy system of A4 type at a fixed ε=3

Fig.3 Phase diagrams of F-F and F-FCC transitions in A4 type of Patchy system at varying ε(A) ε=6.0, Tc*=1.08; (B) ε=18.2, Tc*=2.81; (C) ε=25.0, Tc*=3.77; (D) ε=35.0, Tc*=5.19.

Fig.4 Phase diagram of F-RCP transition in the Patchy system of A4 type at varying εCorresponding phase regions are shown in Fig.4(A), and are omitted in the others, for clarity.(A) ε=3.0; (B) ε=4.2; (C) ε=6.0; (D) ε=12.0.

Fig.5 Critical temperature and triple point for RCPC(inset) and FCC in the Patchy system of Aa type at varying ε

Fig.6 Phase diagram of F-F and F-FCC transitions in the Patchy system of Aa type at varying a and a fixed ε=20.0● a= 3; ■ a=4; ? a=6; ▼ a=8.

Fig.7 Phase diagram of F-F and F-RCP transitions in the Patchy system of Aa type at varying a and a fixed ε=10.0● a= 3; ■ a=4; ? a=6; ▼ a= 8.

Fig.8 Phase diagrams of sol-gel and F-F transitions in Aa type of Patchy system at a fixed ε=10.0(A) α=4; (B) α=3, 4, 6, 8.

Fig.9 Curves of TSG* and Tc* against a for Aa type of Patchy system

Fig.10 Curves of ρSG and ρc against a for Aa type of Patchy system

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