From repulsive to attractive glass: A rheological investigation

doi:10.1063/1.4937796

CORC > 化学研究所 > 中国科学院化学研究所

	From repulsive to attractive glass: A rheological investigation
	Zhou, Zhi 1,2; Jia, Di 1,2; Hollingsworth, Javoris V.3; Cheng, He 4,5; Han, Charles C.1
刊名	JOURNAL OF CHEMICAL PHYSICS
	2015-12-21
卷号	143 期号:23
ISSN号	0021-9606
DOI	10.1063/1.4937796
英文摘要	Linear rheological properties and yielding behavior of polystyrene core and poly (N-isopropylacrylamide) (PNIPAM) shell microgels were investigated to understand the transition from repulsive glass (RG) to attractive glass (AG) and the A(3) singularity. Due to the volume phase transition of PNIPAM in aqueous solution, the microgel-microgel interaction potential gradually changes from repulsive to attractive. In temperature and frequency sweep experiments, the storage modulus (G') and loss modulus (G '') increased discontinuously when crossing the RG-to-AG transition line, while G' at low frequency exhibited a different volume fraction (Phi) dependence. By fitting the data of RG and AG, and then extrapolating to high volume fraction, the difference between RG and AG decreased and the existence of A(3) singularity was verified. Dynamic strain sweep experiments were conducted to confirm these findings. RG at 25 degrees C exhibited one-step yielding, whereas AG at 40 degrees C showed a typical two-step yielding behavior; the first yielding strain remained constant and the second one gradually decreased as the volume fraction increased. By extrapolating the second yield strain to that of the first one, the predicted A(3) singularity was at 0.61 +/- 0.02. At 37 degrees C, when Phi(eff) = 0.59, AG showed one step yielding as the length of the attractive bond increased. The consistency and agreement of the experimental results reaffirmed the existence of A(3) singularity, where the yielding behavior of RG and AG became identical. (C) 2015 AIP Publishing LLC.
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:000369806500036
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/44929]
专题	中国科学院化学研究所
通讯作者	Cheng, He
作者单位	1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Joint Lab Polymer Sci & Mat, Inst Chem,State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ St Thomas, Dept Chem & Phys, Houston, TX 77006 USA 4.Chinese Acad Sci, Inst High Energy Phys, China Spallat Neutron Source CSNS, Dongguan 523803, Peoples R China 5.Dongguan Inst Neutron Sci, Dongguan 523808, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Zhi,Jia, Di,Hollingsworth, Javoris V.,et al. From repulsive to attractive glass: A rheological investigation[J]. JOURNAL OF CHEMICAL PHYSICS,2015,143(23).
APA	Zhou, Zhi,Jia, Di,Hollingsworth, Javoris V.,Cheng, He,&Han, Charles C..(2015).From repulsive to attractive glass: A rheological investigation.JOURNAL OF CHEMICAL PHYSICS,143(23).
MLA	Zhou, Zhi,et al."From repulsive to attractive glass: A rheological investigation".JOURNAL OF CHEMICAL PHYSICS 143.23(2015).