Dielectrophoretic assembly of dimpled colloids into open packing structures

Soft Matter ◽  
2017 ◽  
Vol 13 (34) ◽  
pp. 5724-5730 ◽  
Author(s):  
Zhuoqiang Jia ◽  
Stefano Sacanna ◽  
Stephanie S. Lee
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Electric Field ◽  
Particle Shape ◽  
Colloidal Crystals ◽  
Shape Anisotropy ◽  
Two Dimensional ◽  
Open Packing

Particle shape anisotropy enabled electric field-induced reversible solid-state phase transitions in two-dimensional colloidal crystals comprising dimpled spherical colloids.

Electric-Field-Induced Reversible Phase Transitions in Two-Dimensional Colloidal Crystals

Langmuir ◽  
2015 ◽  
Vol 31 (38) ◽  
pp. 10411-10417 ◽  
Author(s):  
Kelsey A. Collins ◽  
Xiao Zhong ◽  
Pengcheng Song ◽  
Neva R. Little ◽  
Michael D. Ward ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Electric Field ◽  
Colloidal Crystals ◽  
Two Dimensional ◽  
Reversible Phase

Colossal Barocaloric Effects with Ultralow Hysteresis in Two-Dimensional Metal–Halide Perovskites

2021 ◽  
Author(s):  
Jarad Mason ◽  
Jinyoung Seo ◽  
Ryan McGillicuddy ◽  
Adam Slavney ◽  
Selena Zhang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Phase Transitions ◽  
Solid State ◽  
Hydrostatic Pressure ◽  
Metal Halide ◽  
Two Dimensional ◽  
Vapor Compression ◽  
Entropy Changes ◽  
Halide Perovskites ◽  
Solid State Cooling

Abstract Nearly 4,400 TWh of electricity—20% of the total consumed in the world—is used each year by refrigerators, air conditioners, and heat pumps for cooling. In addition to the 2.3 Gt of carbon dioxide emitted during the generation of this electricity, the vapor-compression-based devices that provided the bulk of this cooling emitted fluorocarbon refrigerants with a global warming potential equivalent to 1.5 Gt of carbon dioxide into the atmosphere. With population and economic growth expected to dramatically increase over the next several decades, the development of alternative cooling technologies with improved efficiency and reduced emissions will be critical to meeting global cooling needs in a more sustainable fashion. Barocaloric materials, which undergo thermal changes in response to applied hydrostatic pressure, offer the potential for solid-state cooling with high energy efficiency and zero direct emissions, as well as faster start-up times, quieter operation, greater amenability to miniaturization, and better recyclability than conventional vapor-compression systems. Efficient barocaloric cooling requires materials that undergo reversible phase transitions with large entropy changes, high sensitivity to hydrostatic pressure, and minimal hysteresis, the combination of which has been challenging to achieve in existing barocaloric materials. Here, we report a new mechanism for achieving colossal barocaloric effects near ambient temperature that exploits the large volume and conformational entropy changes of hydrocarbon chain-melting transitions within two-dimensional metal–halide perovskites. Significantly, we show how the confined nature of these order–disorder phase transitions and the synthetic tunability of layered perovskites can be leveraged to reduce phase transition hysteresis through careful control over the inorganic–organic interface. The combination of ultralow hysteresis (< 1.5 K) and high barocaloric coefficients (> 20 K/kbar) leads to large reversible isothermal entropy changes (> 200 J/kg•K) at record-low pressures (< 300 bar). We anticipate that these results will help facilitate the development of barocaloric cooling technologies and further inspire new materials and mechanisms for efficient solid-state cooling.

Reversible solid-state phase transitions in confined two-layer colloidal crystals

2020 ◽  
Vol 298 (12) ◽  
pp. 1611-1617
Author(s):  
Zhuoqiang Jia ◽  
Mena Youssef ◽  
Alexandra Samper ◽  
Stefano Sacanna ◽  
Stephanie S. Lee
Keyword(s):  
Phase Transitions ◽  
Solid State ◽  
Colloidal Crystals

scholarly journals Frustration of freezing in a two dimensional hard-core fluid due to particle shape anisotropy

2016 ◽  
Vol 19 (2) ◽  
pp. 23605
Author(s):  
Huerta ◽  
Tejeda ◽  
Henderson ◽  
Trokhymchuk
Keyword(s):  
Particle Shape ◽  
Hard Core ◽  
Shape Anisotropy ◽  
Two Dimensional
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