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Elucidating the Variable-Temperature Mechanical Properties of a Negative Thermal Expansion Metal–Organic Framework

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [3];  [1];  [2];  [2]
  1. Univ. of Amsterdam (Netherlands). Van‘t Hoff Inst. for Molecular Sciences (HIMS)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy
+ Show Author Affiliations

Here, we report the first experimental study into the thermomechanical and viscoelastic properties of a metal–organic framework (MOF) material. Nanoindentations show a decrease in the Young’s modulus, consistent with classical molecular dynamics simulations, and hardness of HKUST-1 with increasing temperature over the 25–100 °C range. Variable-temperature dynamic mechanical analysis reveals significant creep behavior, with a reduction of 56% and 88% of the hardness over 10 min at 25 and 100 °C, respectively. This result suggests that, despite the increased density that results from increasing temperature in the negative thermal expansion MOF, the thermally induced softening due to vibrational and entropic contributions plays a more dominant role in dictating the material’s temperature-dependent mechanical behavior.

Research Organization:
Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1464192
Report Number(s):
SAND--2018-7644J; 665803
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 25 Vol. 10; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives journal July 2019
Mechanical properties of metal–organic frameworks journal January 2019
Strategies for Overcoming Defects of HKUST‐1 and Its Relevant Applications journal April 2019
Assessing negative thermal expansion in mesoporous metal–organic frameworks by molecular simulation journal January 2019

Figures / Tables (16)

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Related Subjects

36 MATERIALS SCIENCE
HKUST-1
dynamic mechanical analysis
elasticity
mechanical properties
metal−organic frameworks
molecular dynamics
nanoindentations
negative thermal expansion