Peter J. Collings
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View article: Morphology and line tension of twist disclinations in a nematic liquid crystal
Morphology and line tension of twist disclinations in a nematic liquid crystal Open
This work characterizes twist disclinations in nematic liquid crystals, using confocal microscopy to measure their 3D profile and test theoretical predictions, and using magnetic fields to deform the disclinations and measure their line te…
View article: An Ethnographic Model of Stress and Stress Management in two Canadian Inuit Communities
An Ethnographic Model of Stress and Stress Management in two Canadian Inuit Communities Open
As part of the first stage of a Community-Based Participatory Research Project with two communities in the Canadian Arctic—Kangiqsujuaq, Nunavik, and Ulukhaktok, Northwest Territories—we conducted 57 interviews eliciting residents’ percept…
View article: Focal conic flowers, dislocation rings, and undulation textures in smectic liquid crystal Janus droplets
Focal conic flowers, dislocation rings, and undulation textures in smectic liquid crystal Janus droplets Open
Stable and metastable smectic liquid crystal textures, including focal conic domains, dislocations, and undulations, arise within liquid crystal Janus drops. The different textures can be created and controlled via different fabrication pa…
View article: Correction: Yang, S.; Collings, P.J. The Genetic Algorithm: Using Biology to Compute Liquid Crystal Director Configurations. Crystals 2020, 10, 1041
Correction: Yang, S.; Collings, P.J. The Genetic Algorithm: Using Biology to Compute Liquid Crystal Director Configurations. Crystals 2020, 10, 1041 Open
The authors wish to make the following correction to this paper [...]
View article: The Genetic Algorithm: Using Biology to Compute Liquid Crystal Director Configurations
The Genetic Algorithm: Using Biology to Compute Liquid Crystal Director Configurations Open
The genetic algorithm is an optimization routine for finding the solution to a problem that requires a function to be minimized. It accomplishes this by creating a population of solutions and then producing “offspring” solutions from this …
View article: Extremely small twist elastic constants in lyotropic nematic liquid crystals
Extremely small twist elastic constants in lyotropic nematic liquid crystals Open
Significance Some soft matter systems behave similarly and some differently. Understanding this is one of the significant challenges in the field. For example, while the splay and bend elastic constants for thermotropic and lyotropic nemat…
View article: Data from "Extremely Small Twist Elastic Constants in Lyotropic Nematic Liquid Crystals"
Data from "Extremely Small Twist Elastic Constants in Lyotropic Nematic Liquid Crystals" Open
Depolarized dynamic light scattering (DDLS) data, fit routine fitting results
View article: Experimental Investigation of a Small-Scale ORC Power Plant Using a Positive Displacement Expander with and without a Regenerator
Experimental Investigation of a Small-Scale ORC Power Plant Using a Positive Displacement Expander with and without a Regenerator Open
While large-scale ORC power plants are a relatively mature technology, their application to small-scale power plants (i.e., below 10 kW) still encounters some technical challenges. Positive displacement expanders are mostly used for such s…
View article: Dynamic control strategy of a distillation system for a composition-adjustable organic Rankine cycle
Dynamic control strategy of a distillation system for a composition-adjustable organic Rankine cycle Open
Using zeotropic mixtures as working fluids can improve the thermal efficiency of Organic Rankine cycle (ORC) power plants for utilising geothermal energy. However, currently, such ORC systems cannot regulate the composition of zeotropic mi…
View article: Deposition and drying dynamics of liquid crystal droplets
Deposition and drying dynamics of liquid crystal droplets Open
Drop drying and deposition phenomena reveal a rich interplay of fundamental science and engineering, give rise to fascinating everyday effects (coffee rings), and influence technologies ranging from printing to genotyping. Here we investig…
View article: Fully Stable and Homogeneous Lyotropic Liquid Crystal Alignment on Anisotropic Surfaces
Fully Stable and Homogeneous Lyotropic Liquid Crystal Alignment on Anisotropic Surfaces Open
Lyotropic chromonic liquid crystals have great potential in both biosensing and optical devices due to their biocompatible nature and strong optical characteristics. These applications, however, demand a homogeneous and stable alignment on…
View article: Numerical Analysis of an Organic Rankine Cycle with Adjustable Working Fluid Composition, a Volumetric Expander and a Recuperator
Numerical Analysis of an Organic Rankine Cycle with Adjustable Working Fluid Composition, a Volumetric Expander and a Recuperator Open
Conventional Organic Rankine Cycles (ORCs) using ambient air as their coolant cannot fully utilize the greater temperature differential available to them during the colder months. However, changing the working fluid composition so its boil…
View article: Report on the 26th international liquid crystal conference
Report on the 26th international liquid crystal conference Open
The 26th International Liquid Crystal Conference (ILCC) was held on the campus of Kent State University, Kent, OH, USA, from 31 July to 5 August 2016 (Figure 1). William Doane served as the Honorar...
View article: Order at Extreme Dilution
Order at Extreme Dilution Open
Control over the organization of assemblies from molecular dimensions up to the macroscopic length scale is an outstanding challenge in science, above all for materials in high dilution. Instead of inducing order by generating very long an…
View article: Organic rankine cycle with positive displacement expander and variable working fluid composition
Organic rankine cycle with positive displacement expander and variable working fluid composition Open
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
View article: A Combined Organic Rankine Cycle-Heat Pump System for Domestic Hot Water Application
A Combined Organic Rankine Cycle-Heat Pump System for Domestic Hot Water Application Open
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.
View article: Tunable depletion potentials driven by shape variation of surfactant micelles
Tunable depletion potentials driven by shape variation of surfactant micelles Open
Depletion interaction potentials between micron-sized colloidal particles are induced by nanometer-scale surfactant micelles composed of hexaethylene glycol monododecyl ether (C_{12}E_{6}), and they are measured by video microscopy. The st…
View article: A dynamic organic Rankine cycle using a zeotropic mixture as the working fluid with composition tuning to match changing ambient conditions
A dynamic organic Rankine cycle using a zeotropic mixture as the working fluid with composition tuning to match changing ambient conditions Open
Air-cooled condensers are widely used for Organic Rankine Cycle (ORC) power plants where cooling water is unavailable or too costly, but they are then vulnerable to changing ambient air temperatures especially in continental climates, wher…
View article: Chiral structures and defects of lyotropic chromonic liquid crystals induced by saddle-splay elasticity
Chiral structures and defects of lyotropic chromonic liquid crystals induced by saddle-splay elasticity Open
An experimental and theoretical study of lyotropic chromonic liquid crystals (LCLCs) confined in cylinders with degenerate planar boundary conditions elucidates LCLC director configurations. When the Frank saddle-splay modulus is more than…
View article: Chiral structures from achiral liquid crystals in cylindrical capillaries
Chiral structures from achiral liquid crystals in cylindrical capillaries Open
Significance Nematic liquid crystals (LCs) are arguably the simplest examples of partially ordered condensed matter, and they are core materials in many commercial products. Our experiments explore fundamental questions about how chiral co…
View article: Self-organized assemblies of colloidal particles obtained from an aligned chromonic liquid crystal dispersion
Self-organized assemblies of colloidal particles obtained from an aligned chromonic liquid crystal dispersion Open
The behavior of mono-disperse colloidal particles in a chromonic liquid crystal was investigated. Poly(methyl methacrylate) spherical particles with three different functionalizations, with and without surface charges, were utilized in the…