Self-assembled Azo Molecular Glass Microspheres with Rapid Photoinduced Deformation†

doi:10.7503/cjcu20180679

Abstract

Abstract:

Azo molecular glass microspheres with photoinduced deformation properties have attracted attention for fabricating anisotropic particles and other specific-shaped particles. In this work, we investigated the self-assembly of an azo molecular glass(IAC-4) material in tetrahydrofuran/water(THF/H₂O) mixed solvents to form the colloidal spheres with uniform sizes in the dispersions as well as photoinduced deformation behavior of the formed IAC-4 microspheres. The intermediate states of self-assemblies were investigated via dynamic light scattering(DLS). The results showed that as the water content increased, the hydrodynamic radius(R_h) tended to increase to reach the maximum and then decreased gradually. The relationship between the critical water content(cwc) and initial concentration of IAC-4 in THF was proved to be consistent with the solubility of a solid solute in the binary mixed solvents, which indicated that IAC-4 underwent the transition from unsaturated state to a saturated state in the mixed solvents as the water content increased and then gradually aggregated to form the colloids in the dispersions. To test the photoinduced deformation property, the IAC-4 microspheres were obtained by separating the colloidal spheres from the dispersion and dried appropriately. Upon the irradiation with the linearly polarized laser beam(488 nm, 100 mW/cm²), the microspheres of IAC-4 showed rapid photoinduced deformation parallel to the polarized direction. After the irradiation for 1 min, IAC-4 microspheres were rapidly stretched into the ellipsoidal particles with the average axial ratio of 1.44. With the growth of the irradiation time, the average axial ratio further increased. Finally, the IAC-4 microspheres could evolve into the rod-like particles with the average axial ratio of 3.32 for the irradiation time of 7 min.

Key words: Microspheres of azo molecular glass, Mechanism of self-assembly, Critical water content, Photoinduced deformation

CLC Number:

O631
O645

TrendMD:

TANG Bo,HUANG Hao,WU Bing,LI Xu,WANG Xiaogong. Self-assembled Azo Molecular Glass Microspheres with Rapid Photoinduced Deformation^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 548.

Figures/Tables 6

Fig.1 Structure of azo molecular glass(IAC-4)

Fig.2 TEM images of colloidal spheres obtained via the self-assembly of IAC-4(A, B) and the hydrodynamic radius of colloidal spheres(C)

Fig.3 Relationship between the scattered light intensity and water content for IAC-4 solution(1.6 mg/mL)

Fig.4 Hydrodynamic radius of IAC-4 aggregations in the intermediate state of self-assembly(A) and the relationship between the average hydrodynamic radius of IAC-4 aggregations and water content(B)

Fig.5 Relationship between the critical water content(cwc) and the initial concentration of IAC-4 solution(A) and the molar fraction of IAC-4 for different mass ratios of water in the mixed solvents(B)

Fig.6 TEM images of the stretched particles after irradiation for 1 min(A), 3 min(B), 5 min(C) and 7 min(D) and the relationship between the axial ratio(l/d) of stretched particles and irradiation time

References 32

[1]	Kumar G. S., Neckers D. C., Chem. Rev., 1989, 89(8), 1915—1925
[2]	Delaire J. A., Nakatani K., Chem. Rev., 2000, 100(5), 1817—1845
[3]	Xie S., Natansohn A., Rochon P., Chem. Mater., 1993, 5(4), 403—411
[4]	Tuo X. L., Chen Z., Chem. J. Chinese Universities, 2001, 22(2), 329—333
	(庹新林, 陈峥, 吴立峰, 王晓工, 刘德山. 高等学校化学学报, 2001, 22(2), 329—333)
[5]	Wang Y. W., He Y. N., Chem. J. Chinese Universities, 2012, 33(10), 2351—2355
	(王艳伟, 和亚宁, 王晓工. 高等学校化学学报, 2012, 33(10), 2351—2355)
[6]	Zhao Y., Macromolecules, 2012, 45(9), 3647—3657
[7]	Rochon P., Batalla E., Natansohn A., Appl. Phys. Lett., 1995, 66(2), 136—138
[8]	Kim D. Y., Tripathy S. K., Li L., Kumar J., Appl. Phys, Lett., 1995, 66(10), 1166—1168
[9]	Viswanathan N.K.., Kim D. Y., Blan S., Williams J., Liu W., Li L., Samuelson L., Kumar J., Tripathy S. K.,J. Mater. Chem., 1999, 9, 1941—1955
[10]	Natansohn A., Rochon P., Chem. Rev., 2002, 102(11), 4139—4175
[11]	Wang D. R., Wang X. G., Prog. Polym. Sci., 2013, 38, 271—301
[12]	Tang B., Xiong Z. Y., Yun X. W., Wang X. G., Nanoscale, 2019, 10, 4113—4122
[13]	Li Y.B.., He Y. N., Tong X. L., Wang X. G.,J. Am. Chem. Soc., 2005, 127(8), 2402—2403
[14]	Zhou Y. Q., Tang B., Wang X. G., Polymer, 2015, 60, 292—301
[15]	Zhou X. R., Du Y., Wang X. G., ACS Macro. Lett., 2016, 5(2), 234—237
[16]	Ikeda T., Mamiya J. I., Yu Y. L., Angew. Chem. Int. Ed., 2007, 46, 506—528
[17]	Yu H. F., J. Mater. Chem. C, 2014, 2, 3047—3054
[18]	Yuan Q., Zhang Y. F., Chen T., Lu D. Q., Zhao Z. L., Zhang X. B., Li Z. X., Yan C. H., Tan W. H., ACS Nano, 2012, 6(7), 6337—6344
[19]	Riedinger A., Guardia P., Curcio A., Garcia M. A., Cingolani R., Manna L., Pellegrino T., Nano Lett., 2013, 13(6), 2399—2406
[20]	Kim M. J., Seo E. M., Vak D., Kim D. Y., Chem. Mater., 2003, 15(21), 4021—4027
[21]	Nakano H., Takahashi T., Kadota T., Shirota Y., Adv. Mater., 2002, 14(16), 1157—1159
[22]	Ishow E., Bellaïche C., Bouteiller L., Nakatani K., Delaire J. A., J. Am. Chem. Soc., 2003, 125(51), 15744—15745
[23]	Guo M. C., Xu Z. D., Wang X. G., Langmuir, 2008, 24(6), 2740—2745
[24]	Tang B., Zhou Y. Q., Xiong Z. Y., Wang X. G., RSC Adv., 2016, 6, 64203—64207
[25]	Hsu C., Xu Z. D., Wang X. G., Adv. Funct. Mater., 2019, 28, 1802506(15)
[26]	Desjardins A., Eisenberg A., Macromolecules, 1991, 24(21), 5779—5790
[27]	Cheng H., Tuo X. L., Wang G. J., Wang X. G., Macromol. Chem. Phys., 2001, 202(18), 3530—3535
[28]	Li N., Ye G., He Y. N., Wang X. G., Chem. Commun., 2011, 47, 4757—4759
[29]	Zhang L. F., Shen H. W., Eisenberg A., Macromolecules, 1997, 30(4), 1001—1011
[30]	Eghrary S. H., Zarghami R., Martinez F., Jouyban A., J. Chem. Eng. Data, 2012, 57(5), 1544—1550
[31]	Jouyban A., J. Pharm. Sci., 2008, 11(1), 32—58
[32]	Ma H., Qu Y., Zhou Z., Wang S., Li L., J. Chem. Eng. Data, 2012, 57(8), 2121—2127