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金纳米粒子表面修饰剂的组分和形貌影响其物理化学性质. 本文采用隐式溶剂耗散粒子动力学模拟的方法, 研究了金纳米棒、溴化十六烷基三甲基铵和二肉豆蔻酰磷脂酰胆碱的自组装形貌. 结果表明, 复合体组装形貌主要与溴化十六烷基三甲基铵和二肉豆蔻酰磷脂酰胆碱这两种修饰剂的摩尔比有关, 而金纳米棒与修饰剂的相互作用强度以及金纳米棒的直径对形貌的影响不明显. 当作用强度和直径一定时, 随着摩尔比增加, 修饰剂在金纳米棒表面会形成完整的双层膜、有裂痕的双层膜、长片状胶束、以及以螺旋形式缠绕在金纳米棒上的蠕虫状胶束. 进一步分析发现, 金纳米棒直径越小、摩尔比越大、或作用强度越大时, 金纳米棒两端的覆盖程度越高, 同时修饰剂吸附层的厚度越薄. 这些结果直接表征了溴化十六烷基三甲基铵和二肉豆蔻酰磷脂酰胆碱混合物在金纳米棒表面的形态, 在分子水平上加深了对金纳米棒自组装行为的理解, 有助于实现金纳米棒的可控自组装.Gold nanorods (GNRs) have aroused the extensive interest of many researchers in recent years due to their unique physicochemical properties. However, the toxic cetyltrimethylammonium bromide (CTAB) is often introduced into the process of synthesizing GNRs, which hinders the wide-range applications of GNRs in clinical practice. To reduce the toxicity, the CTAB molecules coated on the surface of GNRs should be replaced by nontoxic and biocompatible agents such as phospholipid. Thus the component and morphology of the mixed coating agents on the surface of GNRs affect the physicochemical properties of GNRs. To study the morphology and properties of the coated GNRs at a molecular level, we investigate the self-assembly of GNRs, CTAB, and dimyristoyl phosphatidylcholine (DMPC) by using solvent-free dissipative particle dynamics simulations. Our results show that the morphology of the assembled complex mainly depends on the CTAB/DMPC molar ratio, while neither of the interaction strength between GNRs and the coating agents nor the diameter of GNRs has significant effect on the morphology. At a certain combination of GNRs-coating agent interaction strength with GNRs diameter, the mixture of CTAB and DMPC on the surface of GNRs undergoes a gradual change in morphology as the CTAB/DMPC molar ratio increases, including the forming of intact bilayer membrane, cracked bilayer membrane, long patches of micelles, and short wormlike micelles winding GNRs in spiral shape. The morphology of intact bilayer membrane verifies the experimental guess, while the other three morphologies are brand-new discoveries. We also find that when the GNR’s diameter becomes smaller, or the CTAB/DMPC molar ratio is larger, or the interaction strength is greater, the agents cap the ends of GNRs, meanwhile the membrane thickness becomes thinner. The multiple morphologies of the assembled complexes can be qualitatively explained by the shape energy of a membrane adsorbed on a solid surface. When the surface tension of the membrane (which is proportional to the spontaneous curvature of the membrane) exceeds a critical value (which is equal to the adhesion energy density of the membrane), the membrane dissociates from the solid surface and its shape changes. The change trend is related to the spontaneous curvature of the free membrane. As a result of the synergy and competition among the inherent curvatures of GNRs, the spontaneous curvature of CTAB/DMPC membrane or micelle, as well as the adhesion energy, various interesting morphologies are produced. Our simulations and analyses directly characterize the morphological structures of CTAB and lipid coated GNRs, which allow us to in depth understand the self-assembling behaviors of GNRs at a molecular level. This is also conductive to achieving the controlled assemblies of GNRs.
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Keywords:
- dissipative particle dynamics /
- gold nanorods /
- lipid /
- surfactant
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图 1 粗粒化模型 (a) GNRs; (b) CTAB; (c) DMPC
Fig. 1. Coarse-grained model of (a) GNRs, (b) CTAB, and (c) DMPC
图 2 CTAB和DMPC混合物的形貌图(CTAB的头部H和尾巴T珠子分别用蓝色和黄色表示, 而DMPC的H和M/T珠子分别用红色和绿色表示)
Fig. 2. Morphology of a mixture of CTAB and DMPC. The H and T beads of CTAB are colored in blue and yellow, while the H and M/T beads of DMPC are in red and green, respectively.
图 3 GNRs-CTAB-DMPC复合体在d = 4 nm, D = 4kBT时的组装形貌, 其中CTAB/DMPC摩尔比分别为(a) 1∶1, (b) 3∶2, (c) 4∶1, (d) 8∶1, (e) 16∶1, (f) 1∶0
Fig. 3. Morphology of assembled GNRs-CTAB-DMPC complex with d = 4 nm and D = 4kBT. The CTAB/DMPC molar ratio is (a) 1∶1, (b) 3∶2, (c) 4∶1, (d) 8∶1, (e) 16∶1, (f) 1∶0, respectively.
图 D1 d = 4 nm和D = 4 kBT时GNRs表面修饰剂的投影展开分布图, 其中摩尔比分别为(a) 1∶1, (b) 3∶2, (c) 4∶1, (d) 8∶1, (e) 16∶1, (f) 1∶0
Fig. D1. Projected expansion map of coating agents distributing on the surface of GNRs. Data is obtained at d = 4 nm and D = 4 kBT. The CTAB/DMPC molar ratio is (a) 1∶1, (b) 3∶2, (c) 4∶1, (d) 8∶1, (e) 16∶1, (f) 1∶0.
图 4 (a) 当金纳米棒直径d = 4 nm时, GNRs-CTAB-DMPC复合体在不同CTAB/DMPC摩尔比及D下的组装形貌; (b) 当Morse势参数D = 4kBT时, GNRs-CTAB-DMPC复合体在不同CTAB/DMPC摩尔比及d下的组装形貌
Fig. 4. (a) Morphology of assembled GNRs-CTAB-DMPC complex at various CTAB/DMPC molar ratio and D with given GNR diameter d = 4 nm; (b) morphology of assembled GNRs-CTAB-DMPC complex at various CTAB/DMPC molar ratio and d with given Morse potential parameter D = 4kBT.
图 5 (a) CTAB和(b) DMPC的
$ \alpha $ 角的定义示意图Fig. 5. Schematic diagram of definition of
$ \alpha $ for (a) CTAB and (b) DMPC.
图 6 (a) 修饰剂的蠕虫系数Fworm与D的关系图; (b) Fworm与d的关系图; (c) GNRs的覆盖率Fcap与D的关系图; (d) Fcap与d的关系图; 不同颜色的直线代表不同的摩尔比
Fig. 6. (a) Worming coefficient Fworm of coating agents as a function of D; (b) Fworm as a function of d; (c) capping rate Fcap of GNRs as a function of D; (d) Fcap as a function of d. Results are obtained at various CTAB/DMPC molar ratios, shown in different colors.
图 7 CTAB与DMPC的H1珠子和金珠子在不同D及CTAB/DMPC摩尔比下的RDF, 其中摩尔比分别为(a) 1∶1, (b) 3∶2, (c) 4∶1, (d) 8∶1, (e) 16∶1, (f) 1∶0
Fig. 7. RDF between H1 bead of CTAB and DMPC and gold bead at various D and CTAB/DMPC molar ratios. The molar ratio is (a) 1∶1, (b) 3∶2, (c) 4∶1, (d) 8∶1, (e) 16∶1, (f) 1∶0, respectively.
图 8 不同CTAB/DMPC摩尔比下得到的膜厚度Lmem与D的关系图.
Fig. 8. Membrane thickness Lmem as a function of D. Results are obtained at various CTAB/DMPC molar ratios.
图 9 不同D下得到的GNRs表面修饰剂的投影展开分布图(GNRs直径d = 4 nm), 其中, 线性拟合斜率代表螺旋程度; 左图是CTAB/DMPC摩尔比为16∶1的结果, (a) D = 1kBT, (b) D = 2kBT, (c) D = 3kBT, (d) D = 4kBT; 右图是CTAB/DMPC摩尔比为1∶0的结果, (e) D = 1kBT, (f) D = 2kBT, (g) D = 3kBT, (h) D = 4kBT
Fig. 9. Projected expansion map of coating agent distributing on the surface of GNRs with d = 4 nm. The slope of the linear fitting represents the spiral degree. The left panels are results at CTAB/DMPC molar ratio of 16∶1 with (a) D = 1kBT, (b) D = 2kBT, (c) D = 3kBT, (d) D = 4kBT. The right panels are results at CTAB/DMPC molar ratio of 1∶0 with (e) D = 1kBT, (f) D = 2kBT, (g) D = 3kBT, (h) D = 4kBT.
图 C1 纯DMPC和d = 4 nm, D = 4kBT时GNRs-DMPC的组装形貌 (a) DMPC的形貌及(b)切面图; (c) GNRs-DMPC的形貌及(d)切面图
Fig. C1. Morphology of the pure DMPC lipids and assembled GNRs-DMPC complex with d = 4 nm and D = 4kBT: (a) Morpohology and (b) cross-sectional view of DMPC; (c) morpohology and (d) cross-sectional view of GNRs-DMPC
图 E1 RDF峰的位置示意图, 其中金珠子用黄色表示, CTAB和DMPC的H1珠子用红色表示
Fig. E1. Schematic diagram of RDF. The GN bead is shown in yellow, the H1 head beads of CTAB and DMPC were shown in red.
表 A1 DPD力场中aij参数的取值(ION, H1, H2, M, T珠子分别和文献[43]中的W, Q0, Qa, Na, C珠子一一对应)
Table A1. Values of parameters aij in DPD Force field. The ION, H1, H2, M, and T beads correspond to the W, Q0, Qa, Na, and C beads in Ref [43], respectively.
aij ION H1 H2 M T ION 100 98 98 102 130 H1 98 110 100 102 130 H2 98 100 110 102 130 M 102 102 102 100 110 T 130 130 130 110 100 
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表 A2 Im-DPD力场中c, σ和s参数的值
Table A2. Values of c, σ, s in Im-DPD Force field.
ION H1 H2 M T c 0 19.37 19.37 20.02 24.56 σ 0.5385 0.536 0.536 0.541 0.566 s 0.625 0.625 0.625 0.7135 0.7135
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表 A3 Im-DPD力场中的键长、键角和对应的力参数(d是以纳米为单位的金纳米棒的直径)
Table A3. Equilibrium bonds, angles, and corresponding force constants in Im-DPD Force field. d is the diameter of GNRs in unit of nanometer.
bond L0/r0 K2/kBT·r0–2 angle θ0/(º) K3/kBT GN—GN d/0.71 512 GN—GN—GN 180 600 H1—T 0.47 512 H2—M—M 120 6 H1—H2 0.47 512 H2—M—T 180 6 H2—M 0.47 512 M—T—T 180 6 M—M 0.31 512 T—T—T 180 6 M—T 0.59 512 T—T 0.59 512
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表 E1 不同D及CTAB/DMPC摩尔比下的r1, r2, r3和Lmem
Table E1. r1, r2, r3 and Lmem at different combinations of D and CTAB/DMPC molar ratio.
Molar ratio D = 1kBT D = 2kBT D = 3kBT D = 4kBT r2 r3 Lmem r2 r3 Lmem r1 r2 r3 Lmem r1 r2 r3 Lmem 1∶1 2.88 6.33 3.45 2.72 6.11 3.39 2.62 5.82 3.2 2.24 2.68 5.78 3.1 3∶2 2.93 6.42 3.49 2.72 5.95 3.23 2.64 5.71 3.07 2.25 2.66 5.63 2.97 4∶1 2.89 6.1 3.21 2.8 5.75 2.95 2.32 2.73 5.62 2.89 2.29 2.67 5.36 2.69 8∶1 2.75 6.06 3.31 2.74 5.71 2.97 2.3 2.74 5.52 2.78 2.24 2.70 5.36 2.66 16∶1 2.87 6.09 3.22 2.71 5.74 3.03 2.23 2.70 5.58 2.88 2.26 2.74 5.46 2.72 1∶0 2.75 5.89 3.14 2.79 5.60 2.81 2.29 2.67 5.42 2.75 2.29 2.77 5.36 2.59
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表 B1 单个CTAB胶束的模拟结果, 其中, D是胶束的直径, e是离心率, α是CTAB分子的电离度(更多细节详见文献[50]), 表格中的前3行数据来自文献[50], 用作对比分析
Table B1. Simulations results of the single CTAB micelle. D is the diameter of the micelle, e is the eccentricity, and α is the degree of ionization of CTAB molecules (see Ref. [50] for details). The data in the first three lines are taken from Ref. [50] for comparison.
Force Field D/nm e α All-atomic 4.79 0.29 0.63 Martini 4.54 0.14 0.78 Dry Martini 4.42 0.12 0.73 Im-DPD 5.13 0.16 0.68
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[1] Cioffi N, Torsi L, Ditaranto N, Tantillo G, Ghibelli L, Sabbatini L, Bleve-Zacheo T, D'Alessio M, Zambonin P G, Traversa E 2005 Chem. Mater. 17 5255
Google Scholar
[2] Jin R C, Cao Y W, Mirkin C A, Kelly K L, Schatz G C, Zheng J G 2001 Science 294 1901
Google Scholar
[3] Levard C, Hotze E M, Lowry G V, Jr Brown G E 2012 Environ. Sci. Technol. 46 6900
Google Scholar
[4] Elahi N, Kamali M, Baghersad M H 2018 Talanta 184 537
Google Scholar
[5] 黄运欢, 李璞 2015 物理学报 64 207301
Google Scholar
Huang Y H, Li P 2015 Acta Phys. Sin. 64 207301
Google Scholar
[6] 柯善林 阚彩侠 莫博 从博 朱杰君 2012 物理化学学报 28 1275
Google Scholar
Ke S L, Kan C X, Mo B, Cong B, Zhu J J 2012 Acta Phys.-Chim. Sin. 28 1275
Google Scholar
[7] Singh N, Charan S, Sanjiv K, Huang S H, Hsiao Y C, Kuo C W, Chien F C, Lee T C, Chen P 2012 Bioconjugate Chem. 23 421
Google Scholar
[8] von Maltzahn G, Centrone A, Park J H, Ramanathan R, Sailor M J, Hatton T A, Bhatia S N 2009 Adv. Mater. 21 3175
Google Scholar
[9] Zhang Y, Qian J, Wang D, Wang Y, He S 2013 Angew. Chem. Int. Ed. 52 1148
Google Scholar
[10] Cao J, Galbraith E K, Sun T, Grattan K T V 2012 Sens. Actuators, B 169 360
Google Scholar
[11] Li X, Qian J, He S 2008 Nanotechnology 19 355501
Google Scholar
[12] Mayer K M, Hafner J H 2011 Chem. Rev. 111 3828
Google Scholar
[13] Joshi P P, Yoon S J, Hardin W G, Emelianov S, Sokolov K V 2013 Bioconjugate Chem. 24 878
Google Scholar
[14] Luo T, Huang P, Gao G, Shen G X, Fu S, Cui D X, Zhou C Q, Ren Q S 2011 Opt. Express 19 17030
Google Scholar
[15] Zhang J B, Balla N K, Gao C, Sheppard C J R, Yung L Y L, Rehman S, Teo J Y, Kulkarni S R, Fu Y H, Yin S J 2012 Aust. J. Chem. 65 290
Google Scholar
[16] Troiber C, Kasper J C, Milani S, Scheible M, Martin I, Schaubhut F, Kuchler S, Radler J, Simmel F C, Friess W, Wagner E 2013 Eur. J. Pharmacol. 84 255
Google Scholar
[17] Xue H Y, Wong H L 2011 ACS Nano 5 7034
Google Scholar
[18] Martin C R 1994 Science 266 1961
Google Scholar
[19] Raj M A, John S A 2014 Electrochem. Commun. 45 27
Google Scholar
[20] Abdelrasoul G N, Cingolani R, Diaspro A, Athanassiou A, Pignatelli F 2014 J. Photochem. Photobiol., A 275 7
Google Scholar
[21] Johnson C J, Dujardin E, Davis S A, Murphy C J, Mann S 2002 J. Mater. Chem. 12 1765
Google Scholar
[22] Takahashi H, Niidome Y, Niidome T, Kaneko K, Kawasaki H, Yamada S 2006 Langmuir 22 2
Google Scholar
[23] Lyubartsev A P, Rabinovich A L 2011 Soft Matter 7 25
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[27] Tao H, Chen L, Galati E, Manion J G, Seferos D S, Zhulina E B, Kumacheva E 2019 Langmuir 35 15872
Google Scholar
[28] Wang R Y, Wang H, Wu X, Ji Y, Wang P, Qu Y, Chung T S 2011 Soft Matter 7 8370
Google Scholar
[29] Matthews J R, Payne C M, Hafner J H 2015 Langmuir 31 9893
Google Scholar
[30] Nakashima H, Furukawa K, Kashimura Y, Torimitsu K 2008 Langmuir 24 5654
Google Scholar
[31] Yang J A, Murphy C J 2012 Langmuir 28 5404
Google Scholar
[32] Sreeprasad T S, Pradeep T 2011 Langmuir 27 3381
Google Scholar
[33] 闫昭, 赵文静, 王荣瑶 2016 物理学报 65 126101
Google Scholar
Yan Z, ZhaoW J, Wang R Y 2016 Acta Phys. Sin. 65 126101
Google Scholar
[34] Zhu Y, Qu C, Kuang H, Xu L, Liu L, Hua Y, Wang L, Xu C 2011 Biosens. Bioelectron. 26 4387
Google Scholar
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Google Scholar
[36] da Silva J, Dias R, da Hora G, Soares T, Meneghetti M 2018 J. Braz. Chem. Soc. 29 191
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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