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Liquid crystals create easy-to-read, color-changing sensors

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Jul 11, 2020 (Nanowerk News) Chameleons are famous for their color-changing abilities. Depending on their body temperature or mood, their nervous system directs skin tissue that contains nanocrystals to expand or contract, changing how the nanocrystals reflect light and turning the reptile’s skin a rainbow of colors. Inspired by this, scientists at the Pritzker School of Molecular Engineering (PME) at the University of Chicago have developed a way to stretch and strain liquid crystals to generate different colors. By creating a thin film of polymer filled with liquid crystal droplets and then manipulating it, they have determined the fundamentals for a color-changing sensing system that could be used for smart coatings, sensors, and even wearable electronics. The research, led by Juan de Pablo, Liew Family Professor of Molecular Engineering, was published in the journal Science Advances (“Prolate and oblate chiral liquid crystal spheroids”). liquid crystals PME scientists and engineers have developed a way to stretch and strain liquid crystals to generate different colors. This could be applied in smart coatings, sensors, and wearable electronics. (Image courtesy of Oleg Lavrentovich, Liquid Crystal Institute, Kent State University)

Stretching liquid using thin films

Liquid crystals, which exhibit distinct molecular orientations, are already the basis for many display technologies. But de Pablo and his team were interested in chiral liquid crystals, which have twists and turns and a certain asymmetrical “handedness” — like right-handedness or left-handedness — that allows them to have more interesting optical behaviors. These crystals can also form so-called “blue phase crystals,” which have the properties of both liquids and crystals and can in some cases transmit or reflect visible light better than liquid crystals themselves. The researchers knew that these crystals could potentially be manipulated to produce a wide range of optical effects if stretched or strained, but they also knew that it’s not possible to stretch or strain a liquid directly. Instead, they placed tiny liquid crystal droplets into a polymer film. “That way we could encapsulate chiral liquid crystals and deform them in very specific, highly controlled ways,” de Pablo said. “That allows you to understand the properties they can have and what behaviors they exhibit.”

Creating temperature and strain sensors

By doing this, the researchers found many more different phases — molecular configurations of the crystals — than had been known before. These phases produce different colors based on how they are stretched or strained, or even when they undergo temperature changes. “Now the possibilities are really open to the imagination,” de Pablo said. “Imagine using these crystals in a textile that changes color based on your temperature, or changes color where you bend your elbow.” Such a system could also be used to measure strain in airplane wings, for example, or to discern minute changes in temperature within a room or system. Changes in color provide an excellent way to measure something remotely, without the need for any sort of contact, de Pablo said. “You could just look at the color of your device and know how much strain that material or device is under and take corrective action as needed,” he said. “For example, if a structure is under too much stress, you could see the color change right away and close it down to repair it. Or if a patient or an athlete placed too much strain on a particular body part as they move, they could wear a fabric to measure it and then try to correct it.” Though the researchers manipulated the materials with strain and temperature, there’s also the potential to affect them with voltage, magnetic fields, and acoustic fields, he said, which could lead to new kinds of electronic devices made from these crystals. “Now that we have the fundamental science to understand how these materials behave, we can start applying them to different technologies,” de Pablo said.

Source: https://feeds.nanowerk.com/~/630039229/0/nanowerk/agwb~Liquid-crystals-create-easytoread-colorchanging-sensors.php

Nano Technology

The Process of Reaction Injection Molding

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This guide to the process of reaction injection molding will help you determine if the popular and advantageous molding method is suited to your application.

Reaction injection molding (RIM) is a type of popular part molding process for producing large, complex parts in lower volumes. This unique process offers several benefits, such as lower tooling costs, sophisticated aesthetics, and unparalleled design freedom. If you are interested in utilizing RIM as your part production method, continue reading to learn more about the process of reaction injection molding.

Liquid Polymers Are Mixed Together

The process of reaction injection molding begins by mixing two liquid polymers together. The liquid polymers used in the process are known as polyol and isocyanate. These polymers are dispensed from their storage tanks into a multi-stream mixhead by high-pressure industrial pumps and then recirculated back into their storage tanks in a continuous loop.

The Mixture Is Injected Into an Aluminum Tool

Once blended together, the polyol and isocyanate create a low-viscosity mixture. This mixture is then injected into a heated mold. Because the mixture has a low viscosity, it does not require extremely high temperatures or pressures in order to get the material to fit the tool.

As such, the mold is typically made from low-cost aluminum rather than expensive steel which is required for many other molding processes such as injection molding. Thus, opting for RIM over other methods can greatly lower tooling costs and is often highly economically beneficial when creating parts in smaller production volumes.

The Chemical Reaction Takes Place

After the polymer mixture is injected into the aluminum mold, a heat-generating chemical reaction will take place. The reaction will cause the mixture to expand and fill the space of the mold. Upon doing so, the material will quickly harden. Curing times for reaction injection molded parts can range anywhere from a few seconds to several minutes, depending on a variety of factors such as the part’s size, wall thickness, and geometry.

The Finished Part Is Removed From the Tool

Once the polymer mixture hardens inside of the mold, it is ready to be removed. RIM generally has very short demolding times in comparison to other processes. Once the part is demolded, the reaction injection molding process can immediately begin again.

 

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Turning a hot spot into a cold spot: Fano-shaped local-field responses probed by a quantum dot

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Home > Press > Turning a hot spot into a cold spot: Fano-shaped local-field responses probed by a quantum dot

(a) Schematics of the QD-loaded nanoantenna excited by a polarization-controlled light beam. (b) Simulated spectral dispersions and spatial distributions of the local-field responses under x-polarized and y-polarized excitation. (c,d) Simulated spectral dispersions of local-field responses under elliptically polarized excitation. The spectra exhibit Fano lineshapes with tunable Fano asymmetry parameter q and nearly vanishing Fano dips. Local-field distributions show that at the Fano dips the hot spot at the nanogap can be turned into a cold spot. CREDIT
by Juan Xia, Jianwei Tang, Fanglin Bao, Yongcheng Sun, Maodong Fang, Guanjun Cao, Julian Evans, and Sailing He
(a) Schematics of the QD-loaded nanoantenna excited by a polarization-controlled light beam. (b) Simulated spectral dispersions and spatial distributions of the local-field responses under x-polarized and y-polarized excitation. (c,d) Simulated spectral dispersions of local-field responses under elliptically polarized excitation. The spectra exhibit Fano lineshapes with tunable Fano asymmetry parameter q and nearly vanishing Fano dips. Local-field distributions show that at the Fano dips the hot spot at the nanogap can be turned into a cold spot. CREDIT
by Juan Xia, Jianwei Tang, Fanglin Bao, Yongcheng Sun, Maodong Fang, Guanjun Cao, Julian Evans, and Sailing He

Abstract:
Optical nanoantennas can convert propagating light to local fields. The local-field responses can be engineered to exhibit nontrivial features in spatial, spectral and temporal domains. Local-field interferences play a key role in the engineering of the local-field responses. By controlling the local-field interferences, researchers have demonstrated local-field responses with various spatial distributions, spectral dispersions and temporal dynamics. Different degrees of freedom of the excitation light have been used to control the local-field interferences, such as the polarization, the beam shape and beam position, and the incidence direction. Despite the remarkable progress, achieving fully controllable local-field interferences remains a major challenge. A fully controllable local-field interference should be controllable between a constructive interference and a complete destructive interference. This would bring unprecedented benefit for the engineering of the local-field responses.

Turning a hot spot into a cold spot: Fano-shaped local-field responses probed by a quantum dot


Changchun, China | Posted on October 9th, 2020

In a new paper published in Light Science & Application, a team of scientists from China, led by Professor Sailing He from Zhejiang University and Professor Jianwei Tang from Huazhong University of Science and Technology, have experimentally demonstrated that based on a fully controllable local-field interference designed in the nanogap of a nanoantenna, a local-field hot spot can be turned into a cold spot, and the spectral dispersion of the local-field response can exhibit dynamically tunable Fano lineshapes with nearly vanishing Fano dips. By simply controlling the excitation polarization, the Fano asymmetry parameter q can be tuned from negative to positive values, and correspondingly, the Fano dip can be tuned across a broad wavelength range. At the Fano dips, the local-field intensity is strongly suppressed by up to ~50-fold.

The nanoantenna is an asymmetric dimer of colloidal gold nanorods, with a nanogap between the nanorods. The local-field response in the nanogap has the following features: First, local field can be excited by both orthogonal polarizations; Second, the local-field polarization has a negligible dependence on the excitation polarization; Third, the local-field response is resonant for one excitation polarization, but nonresonant for the orthogonal excitation polarization. The first two features make the local-field interferences fully controllable. The third feature further enables Fano-shaped local-field responses.

For experimental study of the local-field responses, it is crucial to probe the local fields at specified spatial and spectral positions. The scientists use a single quantum dot as a tiny sensors to probe the local-field spectrum in the nanogap of the nanoantenna. When the quantum dot is placed in the local field, it is excited by the local field, and its photoluminescence intensity can reveal the local-field response through comparison with its photoluminescence intensity excited directly by the incident light.

Superb fabrication technique is needed to fabricate such a tiny nanoantenna and put the tiny quantum dot sensor into the nanogap. The scientists use the sharp tip of an atomic force microscope (AFM) to do this job, pushing nanoparticles together on a glass substrate.

The scientists summarized the relevance of their work:

“Turning a local-field hot spot into a cold spot significantly expands the dynamic range for local-field engineering. The demonstrated low-background and dynamically tuneable Fano-shaped local-field responses can contribute as design elements to the toolbox for spatial, spectral and temporal local-field engineering.”

“More importantly, the low background and high tunability of the Fano lineshapes indicate that local-field interferences can be made fully controllable. Since the local-field interferences play a key role in the spatial, spectral and temporal engineering of the local-field responses, this encouraging conclusion may further inspire diverse designs of local-field responses with novel spatial distributions, spectral dispersions and temporal dynamics, which may find application in nanoscopy, spectroscopy, nano-optical quantum control and nanolithography.”

####

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Jianwei Tang

Copyright © Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

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Nano Technology

Development of cost-efficient electrocatalyst for hydrogen production: Development of a highly efficient and durable electrocatalyst for water electrolysis that will lead to cost-efficient hydrogen production. Trace amounts of titanium doping on low-cost molybdenum phosphide resu

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Home > Press > Development of cost-efficient electrocatalyst for hydrogen production: Development of a highly efficient and durable electrocatalyst for water electrolysis that will lead to cost-efficient hydrogen production. Trace amounts of titanium doping on low-cost molybdenum phosphide resu

Schematic diagram of the step-by-step synthesis process for the preparation of Ti.MoP. CREDIT
Korea Institue of Science and Technology(KIST)
Schematic diagram of the step-by-step synthesis process for the preparation of Ti.MoP. CREDIT
Korea Institue of Science and Technology(KIST)

Abstract:
The key to promoting the hydrogen economy represented by hydrogen vehicles is to produce hydrogen for electricity generation at an affordable price. Hydrogen production methods include capturing by-product hydrogen, reforming fossil fuel, and electrolyzing water. Water electrolysis in particular is an eco-friendly method of producing hydrogen, in which the use of a catalyst is the most important factor in determining the efficiency and price competitiveness. However, water electrolysis devices require a platinum (Pt) catalyst, which exhibits unparalleled performance when it comes to speeding up the hydrogen generation reaction and enhancing long-term durability but is high in cost, making it less competitive compared to other methods price-wise.

Development of cost-efficient electrocatalyst for hydrogen production: Development of a highly efficient and durable electrocatalyst for water electrolysis that will lead to cost-efficient hydrogen production. Trace amounts of titanium doping on low-cost molybdenum phosphide resu


Sejong, Korea | Posted on October 9th, 2020

There are water electrolysis devices that vary in terms of the electrolyte that dissolves in water and allows current to flow. A device that uses a proton exchange membrane (PEM), for instance, exhibits a high rate of hydrogen generation reaction even with the use of a catalyst made of a transition metal instead of an expensive Pt-based catalyst. For this reason, there has been a great deal of research on the technology for commercialization purposes. While research has been focused on achieving high reaction activity, research on increasing the durability of transition metals that easily corrode in an electrochemical environment has been relatively neglected.

The Korea Institute of Science and Technology (KIST) announced that a team headed by Dr. Sung-Jong Yoo from the Center for Hydrogen-Fuel Cell Research developed a catalyst made of a transition metal with long-term stability that could improve hydrogen production efficiency without the use of platinum by overcoming the durability issue of non-platinum catalysts.

The research team injected a small amount of titanium (Ti) into molybdenum phosphide (MoP), a low-cost transition metal, through a spray pyrolysis process. Because it is inexpensive and relatively easy to handle, molybdenum is used as a catalyst for energy conversion and storage devices, but its weakness includes the fact that it corrodes easily as it is vulnerable to oxidation.

In the case of the catalyst developed by the research team at KIST, it was found that the electronic structure of each material became completely restructured during the synthesis process, and it resulted in the same level of hydrogen evolution reaction (HER) activity as the platinum catalyst. The changes in the electronic structure addressed the issue of high corrosiveness, thereby improving durability by 26 times compared to existing transition metal-based catalysts. This is expected to greatly accelerate the commercialization of non-platinum catalysts.

Dr. Yoo of KIST said, “This study is significant in that it improved the stability of a transition metal catalyst-based water electrolysis system, which had been its biggest limitation. I hope that this study, which boosted the hydrogen evolution reaction efficiency of the transition metal catalyst to the level of platinum catalysts and at the same time improved the stability will contribute to earlier commercialization of eco-friendly hydrogen energy production technology.”

###

This study was carried out with a grant from the Ministry of Science and ICT (MSIT), as part of the Institutional R&D Program of KIST, the Technical Development Program for Responding to Climate Change, and the Global Frontier Multi-Scale Energy System Research Program. It was published in the latest edition of Nano Energy (IF: 16.602, Top 4.299% in the field of JCR), a leading international journal in the area of energy and nanotechnology.

####

For more information, please click here

Contacts:
Do-Hyun Kim
82-295-86344

Copyright © National Research Council of Science & Technology(NST)

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