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Title: Dynamic Scaling of Colloidal Gel Formation at Intermediate Concentrations

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [3];  [4];  [3];  [1];  [3];  [2];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Division
  2. Florida State Univ., Tallahassee, FL (United States). College of Engineering, Chemical and Biomedical Engineering
  3. AGH Univ. of Science and Technology, Krakow (Poland)
  4. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Physics and Astronomy
+ Show Author Affiliations

Here, we have examined the formation and dissolution of gels composed of intermediate volume-fraction nanoparticles with temperature-dependent short-range attractions using small-angle x-ray scatter- ing (SAXS), x-ray photon correlation spectroscopy (XPCS), and rheology to obtain nanoscale and macroscale sensitivity to structure and dynamics. Gel formation after temperature quenches to the vicinity of the rheologically-determined gel temperature, Tgel, was characterized via the slow-down of dynamics and changes in microstructure observed in the intensity autocorrelation functions and structure factor, respectively, as a function of quench depth (ΔT = Tquench - Tgel), wave vector, and formation time (tf). We find similar patterns in the slow-down of dynamics that maps the wave-vector-dependent dynamics at a particular ΔT and tf to that at other ΔTs and tfs via an effective scaling temperature, Ts. A single Ts applies to a broad range of ΔT and tf but does depend on the particle size. The rate of formation implied by the scaling is a far stronger function of ΔT than that of the attraction strength between colloids. Finally, we interpret this strong temperature de- pendence in terms of changes in cooperative bonding required to form stable, energetically favored, local structures.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC); National Center for Research and Development, Poland
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1425262
Alternate ID(s):
OSTI ID: 1404748
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 119; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Sub-microsecond-resolved multi-speckle X-ray photon correlation spectroscopy with a pixel array detector journal August 2018
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Enhanced gel formation in binary mixtures of nanocolloids with short-range attraction journal January 2018
Anisotropic and heterogeneous dynamics in an aging colloidal gel text January 2020
Dynamics of soft nanoparticle suspensions at hard X-ray FEL sources below the radiation damage threshold text January 2018
Dynamics of soft nanoparticle suspensions at hard X-ray FEL sources below the radiation-damage threshold journal October 2018
Anisotropic and heterogeneous dynamics in an aging colloidal gel journal January 2020

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