Resolving aging dynamics of a 3D colloidal glass
文献类型：期刊论文
| 作者 | Wang, Xiaojuan1,3 ; Duan, Jun1,3; Ding, Gan3; Lu, Yunzhuo2; Lu, Xing2; Dai, Lanhong1,3; Jiang, Minqiang1,3
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| 刊名 | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
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| 出版日期 | 2024-03-01 |
| 卷号 | 67期号:3页码:9 |
| ISSN号 | 1674-7348 |
| 关键词 | colloidal glass physical aging particle dynamics free volume boson peak |
| DOI | 10.1007/s11433-023-2280-y |
| 通讯作者 | Lu, Yunzhuo(luyz@djtu.edu.cn) ; Jiang, Minqiang(mqjiang@imech.ac.cn) |
| 英文摘要 | Physical aging is an inherent property of glassy matter, but understanding its microscopic mechanism remains a challenge particularly at the particle level. In this work, we use a confocal microscope to in-situ trace the particle trajectories in a 3D colloidal glass for 73000 s, aiming at resolving the aging dynamics. By calculating the mean square displacement of particle motions, we find that the glass aging with time can be divided into three stages: beta relaxation, alpha relaxation and free diffusion. The system's mean square displacement at each aging state is quantitatively resolved into three contributions of particle dynamics modes: vibration within the nearest-neighbor cages, hopping between cages and cooperative rearrangement. We further calculate the particle's free volume and find that the beta-to-alpha transition is accompanied by the temporary increase of the system-averaged free volume due to pronounced hops of particles. Nevertheless, the temporal autocorrelation of the free volume spatial distribution still obeys a monotonically stretched exponential decay with an exponent of 0.76, which is related to the sub-diffusion dynamics of cooperative rearrangements and hops mixed in alpha relaxation. According to the resolved vibrational displacements, we calculate the vibrational density of states of this 3D glass, and the characteristic boson peak is reproduced at low frequencies. Our findings shed insight into the particle-level aging dynamics of a real glass under purely thermal activation. |
| WOS关键词 | BOSON PEAK ; RELAXATION ; DIFFUSION ; FLOW ; DEFORMATION ; TEMPERATURE ; MECHANISM ; LIQUIDS |
| 资助项目 | National Outstanding Youth Science Fund Project[12125206] ; Basic Science Center for Multiscale Problems in Nonlinear Mechanics[11988102] ; General Project of National Natural Science Foundation of China[11972345] ; CAS Project for Young Scientists in Basic Research[YSBR-096] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001157231400002 |
| 资助机构 | National Outstanding Youth Science Fund Project ; Basic Science Center for Multiscale Problems in Nonlinear Mechanics ; General Project of National Natural Science Foundation of China ; CAS Project for Young Scientists in Basic Research |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/94424]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Lu, Yunzhuo; Jiang, Minqiang |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Dalian Jiaotong Univ, Sch Mat Sci & Engn, Dalian 116028, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Xiaojuan,Duan, Jun,Ding, Gan,et al. Resolving aging dynamics of a 3D colloidal glass[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2024,67(3):9. |
| APA | Wang, Xiaojuan.,Duan, Jun.,Ding, Gan.,Lu, Yunzhuo.,Lu, Xing.,...&Jiang, Minqiang.(2024).Resolving aging dynamics of a 3D colloidal glass.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,67(3),9. |
| MLA | Wang, Xiaojuan,et al."Resolving aging dynamics of a 3D colloidal glass".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 67.3(2024):9. |
入库方式： OAI收割
来源：力学研究所
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