MRS Bulletin Materials News podcast

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MRS Bulletin Materials News Podcast

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#Science #News #Tech News #MRS Bulletin #Materials Research #Materials Science #3d Bioprinting #Artificial Intelligence #Machine Learning #Bioelectronics #Perovskites #Quantum Materials #Robot #Materials For Sustainability #And Synthetic Biology

MRS Bulletin Materials News Podcast

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108 Episoden

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Episode 6: Nanocube self-assembly pathways uncovered 4:23

vor 5 weeks4:23

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4:23

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Xingchen Ye of Indiana University about his research group’s studies on the fundamental behavior of colloidal materials. Colloidal materials consist of liquids with nanoparticles suspended in them. Ye’s team is interested in how a colloidal material’s properties change as the team spatially rearranges the nanoparticles in the liquid. They looked specifically at the self-assembly of gold nanocubes into a lattice structure. Ye’s team studied how that structure gives rise to the material’s bulk properties. This work was published in a recent issue of Nature Chemical Engineering .…

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Episode 5: Triboelectric nanogenerator powered by wind-driven leaf motion 5:59

vor 6 weeks5:59

5:59

In this podcast episode, MRS Bulletin ’s Laura Leay interviews Fabian Meder from the Italian Institute of Technology in Genova and the Sant’Anna School of Advanced Studies in Piza, Italy about his research group’s device that makes use of wind-driven plant leaf motion to generate electricity which can power a chemical delivery system. Their triboelectric nanogenerator involves an artificial leaf made of a 500 μm silicone elastomer layer and an electrode made from indium tin oxide. This is attached to the leaf of a plant. A gold-coated pin electrode inserted in the stem of the plant harvests charges from the plant tissue. This work was published in a recent issue of Bioinspiration & Biomimetic .…

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Episode 4: Researchers pinpoint AI/ML training set to achieve accurate predictions 4:00

vor 8 weeks4:00

4:00

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Bowen Deng, a graduate student in Gerbrand Ceder’s group at the University of California, Berkeley, about their work on increasing the accuracy of artificial intelligence/machine learning materials prediction models. The use of computer simulations to predict the interaction between atoms in a given molecule is being replaced by machine learning. Researchers describe the atoms’ collective interactions as a quantity of energy, where higher energies correspond to stronger forces holding the molecule together. Now, Deng’s research group studied three machine learning models and found that they tend to predict lower energies than what is accurate by about 20 percent. The researchers have determined that these underpredictions were caused by biased training data and they found a way to remedy the situation. This work was published in a recent issue of NPJ Computational Materials .…

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Episode 3: Surface defects control bulk properties of lead halide perovskites 3:58

vor 11 weeks3:58

3:58

In this podcast episode, MRS Bulletin ’s Laura Leay interviews David Cahen from the Weizmann Institute of Science, Israel, about the impact surface defects have on bulk properties, specifically in the case of lead halide perovskites. In a perspective he co-authored, Cahen connected numerous experimental data from other researchers that exposed this phenomenon. By understanding how surface defects control the material’s electronic behavior, researchers can pursue new materials for the development of long-lasting devices. This work was published in a recent issue of Advanced Materials.…

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Episode 2: Compression activates optical tuning in smart window 4:47

vor 12 weeks4:47

4:47

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Gwangmin Bae of Korea University about his work with colleagues on the design of a new smart window system that utilizes compression. Like other smart windows, this window makes use of pores within the material to adjust its transparency. However, instead of using a stretchy material that controls light scattering through the pores, Bae and colleagues used a material that compresses in thickness. That is, the window becomes more transparent when it is compressed. The researchers place this structured porous material made of the polymer polydimethylsiloxane or PDMS between two panes of glass to create the smart window. This work was published in a recent issue of Nature Communications .…

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Episode 1: Carbon fiber-based structural battery serves multiple functions 4:33

vor 14 weeks4:33

4:33

In this podcast episode, MRS Bulletin’s Laura Leay interviews Leif Asp of Chalmers University of Technology about his group’s development of an all-carbon fiber-based structural battery. The negative electrode uses carbon fiber and, for the positive electrode, the carbon fiber is coated with lithium iron phosphate. In both cases the carbon fiber takes on the roles of mechanical reinforcement and current collection. This work was published in a recent issue of Advanced Materials .…

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Episode 23: Frontal polymerization controls materials properties 5:53

vor 23 weeks5:53

5:53

In this podcast episode, MRS Bulletin’s Laura Leay interviews Nancy Sottos, the Maybelle Leland Swanlund Endowed Chair and head of the Department of Materials Science and Engineering at the University of Illinois–Urbana Champaign (UIUC), and Justine Paul, a former student at UIUC who now holds a position at DuPont, about their work with frontal polymerization. By mimicking patterns in biological materials such as shells, their research group took a multidisciplinary approach to control crystalline patterning, which ultimately enabled them to control mechanical properties of polymers. By applying heat, they made slight changes in the chemical reactions to achieve specific crystalline patterns. This work was published in a recent issue of Nature .…

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Episode 22: Additive manufacturing enhances toughness in formable cementitious materials 4:24

vor 23 weeks4:24

4:24

In this podcast episode, MRS Bulletin’s Laura Leay interviews Reza Moini of Princeton University about his group’s development of an enhanced additive manufacturing technique to fabricate cementitious materials with excellent fracture toughness. They based their design of the material on the double-helical or double-bouligand structure of coelacanth fish scales that resist deformation. In order to fabricate the material, Moini’s research team used a two-component robotic additive manufacturing process. The extrusion system was controlled using specialist algorithms. This work was published in a recent issue of Nature Communications .…

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Episode 21: Hierarchical ceramics resist crack propagation 5:28

vor 24 weeks5:28

5:28

In this podcast episode, MRS Bulletin’s Sophia Chen interviews postdoctoral research fellow Rohit Pratyush Behera and Prof. Hortense Le Ferrand of Nanyang Technological University in Singapore about their design of a strong and tough ceramic that absorbs energy, inspired from biology. They borrowed microscopic designs found in a mollusk, a mantis shrimp, and the enamel casing surrounding human teeth. The researchers stacked round discs of aluminum oxide particles in horizontal layers in a helical structure, then encased the structure in an extra protective layer made of alumina nanoparticles. The aluminum oxide in the discs is designed to respond to an external magnetic field, modifying the orientation of the discs layer by layer, consequently adjusting the properties of the ceramic composites. This work was published in a recent issue of Cell Reports Physical Science .…

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Episode 20: Amino-silane treatment extends perovskite performance 4:40

vor 28 weeks4:40

4:40

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Yen-Hung Lin of Hong Kong University of Science and Technology about his work to eliminate defects in perovskite solar cells. Lin’s group treated the perovskites with a category of molecules known as amino-silanes, which bind vacancies in the perovskites, preventing recombination of the electrons and holes. The amino-silane treatment retained the device’s performance at 95% power conversion efficiency for more than 1500 hours. This work was published in a recent issue of Science .…

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Episode 19: 4D-STEM measures thermal properties of 2D materials 4:44

vor 28 weeks4:44

4:44

In this podcast episode, MRS Bulletin’s Laura Leay interviews Michael Pettes, deputy group leader and staff scientist at the Center for Integrated Nanotechnologies in Los Alamos National laboratory about a characterization technique that employs a four-dimensional scanning transmission electron microscope (4D-STEM) paired with complex computational data analysis to directly measure the thermal expansion coefficient (TEC) of monolayer epitaxial tungsten diselenide. The standard technique for directly measuring the TEC involves X-ray diffraction, but 2D materials are too thin. 4D-STEM uses a patterned electron probe which enables diffraction positions to be accurately mapped in real space. This method overcomes the challenges of indirect measurements and spatial resolution. This work was published in a recent issue of ACS Nano .…

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Episode 18: Glassy gels exhibit numerous mechanical properties 4:55

vor 36 weeks4:55

4:55

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Michael Dickey of North Carolina State University about the discovery and mechanical properties of glassy gels. Dicky credits his postdoc Meixiang Wang who, while studying ionic liquids, created the first glassy gel. Dicky’s group found that the mechanical properties of their glassy gel include shape memory, self-healing, and adhesion. While other materials may demonstrate comparable toughness and stretchiness, the glassy gel offers an advantage because of its simple curing process. This work was published in a recent issue of Nature .…

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Episode 17: Metamaterial tailors thermal emission 3:03

vor 37 weeks3:03

3:03

In this podcast episode, MRS Bulletin’s Laura Leay interviews Coskun Kocabas from The University of Manchester in the UK about his development of a metamaterial that can tailor thermal emission. Rather than using a periodic system, which most topological materials employ, his research team borrowed a concept from laser design and created an optical cavity using a dielectric medium sandwiched between two layers that act as mirrors: a metal substrate and a top layer of platinum. The top layer serves as a thermal emitter, and the thickness of the top layer defines the topological property that regulates thermal emissivity. This work was published in a recent issue of Science .…

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Episode 16: Researchers fabricate monolithic selenium/silicon tandem solar cell 4:37

vor 38 weeks4:37

4:37

In this podcast episode, MRS Bulletin’s Laura Leay interviews Rasmus Neilsen from the Technical University of Denmark about his fabrication of a monolithic selenium/silicon tandem solar cell. The selenium forms the top cell of the tandem device, with silicon used as the bottom cell. Selenium-based single-junction solar cells have traditionally used fluorine-doped tin oxide. In this work indium-tin oxide was used as a transparent conductive layer that is easier to deposit and its use is more widespread. Neilsen and his research team controlled the thickness of the carrier-selective contacts in the silicon solar cell that protects the silicon layer from the processes used to deposit subsequent layers on top, thus enabling them to deposit the top cell directly onto the substrate. This work was published in a recent issue of PRX Energy .…

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Episode 15: Torsional force microscopy reveals the moiré superlattices 4:58

vor 44 weeks4:58

4:58

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Mihir Pendharkar of Stanford University about characterizing electronic properties of twistronics materials. Twistronics refers to a type of electronic device consisting of two-dimensional materials layered at a relative twist angle, forming a new periodic structure known as moiré superlattices. Pendharkar and colleagues studied different configurations of graphene layered with hexagonal boron nitride. Determining the twist angle of any particular sample is extremely time-consuming. By developing a characterization technique called torsional force microscopy, Pendharkar and colleagues have reduced the time to a matter of hours. This work was published in a recent issue of Proceedings of the National Academy of Sciences .…

MRS Bulletin Materials News Podcast

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Episode 15: Transonic dislocation propagation observed in diamond 5:05

vor 1 year5:05

5:05

In this podcast episode, MRS Bulletin’s Laura Leay interviews Kento Katagiri, a postdoctoral scholar at Stanford University, about the propagation speed of dislocations in materials. Using an X-ray free electron laser to collect data from single-crystal diamond, Katagiri and colleagues have determined the velocity of wave propagation to be in the transonic region. Katagiri’s work is most applicable to extreme shock events such as missile strikes and shuttle launches where pressures of one terapascal or more might apply. The results are relevant to a type of nuclear fusion known as Inertial Confinement Fusion, which uses intense lasers to compress the fuel. This work was published in a recent issue of Science .…

MRS Bulletin Materials News Podcast

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Episode 14: Liquid samples coated in gold nanorods enhance cellular characterization 7:46

vor 2 years7:46

7:46

In this podcast episode, MRS Bulletin’s Laura Leay interviews Stanford University’s Jennifer Dionne and her PhD student Fareeha Safir and their colleague Amr. Saleh from Cairo University about their work on identifying bacteria in complex samples. Instead of culturing bacteria then identifying them using specific methods such as a polymerase chain reaction test, which takes hours, Dionne’s research group uses Raman spectroscopy combined with machine learning to detect the presence of two specific bacteria in samples that contained red blood cells. The addition of gold nanorods to the samples further enhanced the signal from the bacteria. Another way the research team accelerated the detection of bacteria signal was by building an acoustic bioprinter for the liquid samples: the specialist printer uses focused soundwaves to break the surface tension of a larger droplet, maintaining cell viability. This work was published in a recent issue of Nano Letters .…

MRS Bulletin Materials News Podcast

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Episode 13: Bioprinting combined with interferometry enables precision oncology 5:17

vor 2 years5:17

5:17

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Alice Soragni of the University of California, Los Angeles about her work in precision oncology. Rather than sequence the DNA of a patient’s tumor, Soragni uses bioprinting to create organoids from the patient’s cells. She then adds various drugs to the cells to directly test their response to each drug. To check the effectiveness of the drugs, Soragni’s group measures the organoid’s mass with a technique called interferometry. Interferometry is a non-invasive technique that involves shining light on the cells to monitor their response to the drug. This process allows Soragni to characterize the organoid’s response to the drug in fine detail. This work was published in a recent issue of Nature Communications .…

MRS Bulletin Materials News Podcast

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Episode 12: Hydrogel adsorbs more water at elevated temperature 3:40

vor 2 years3:40

3:40

While thermodynamics suggests that water sorption is more favorable at a low temperature, MRS Bulletin podcaster Laura Leay interviews post-doctoral researcher Xinyue Liu from the Massachusetts Institute of Technology (MIT) who reports a hydrogel that can adsorb more water at elevated temperatures. Liu and the research team from MIT and the University of Michigan were searching for a way to harvest water from the air without using a lot of energy. They want to tackle the problem of water scarcity and find a way of generating water sustainably. To do so, they tested many different sorbents. Most sorbents, such as zeolite and silica gel, have a structure that does not change much when it has adsorbed water; however, the polyethylene glycol – or PEG – hydrogel that the team synthesized is different. While it is semi-crystalline at 25°C, it becomes amorphous at 50°C. This structural change means that more adsorption sites are available at the higher temperature. As water is absorbed, it caused the hydrogel to swell, opening up further adsorption sites. The PEG hydrogel monomers are star-shaped, forming a network where the molecular weight can be precisely controlled. The shape of the monomer leads to very homogeneous structures, facilitating crystallization. The PEG hydrogel exhibited a water uptake of 0.050 grams per gram of polymer at 50°C and 50% relative humidity, with half this water uptake at 25°C and the same humidity. This work was published in a recent issue of Advanced Materials .…

MRS Bulletin Materials News Podcast

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Episode 11: Introduction of hydrogen produces eco-friendly thermoelectric oxides 3:11

vor 2 years3:11

3:11

Many industrial processes require heat or create it as a by-product. Now, Takayoshi Katase from the Tokyo Institute of Technology has found a way to harness this heat in an eco-friendly way, as he explains in an interview with MRS Bulletin podcaster Laura Leay. One way to harness this heat is to use thermoelectric devices to produce electricity via the Seebeck effect. Conventional thermoelectric materials, however, are composed of heavy metals such as lead and tellurium, which are toxic. To incorporate hydrogen into the structure, and so replace the toxic elements, Katase’s research team used a rapid thermal sintering process where the starting material—which already includes the hydrogen—is sealed inside a tube. Some of the oxygen sites in strontium titanate are then substituted by the hydrogen. “More than expected, the hydrogen substitution reduces thermal conductivity less than half, and also increases electronic conductivity, resulting in the large enhancement of energy conversion efficiency,” Katase says. This work was published in a recent issue of Advanced Functional Materials .…

MRS Bulletin Materials News Podcast

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Episode 10: Photonic time crystal amplifies electromagnetic signal 4:17

vor 2 years4:17

4:17

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Xuchen Wang of Karlsruhe Institute of Technology in Germany about his work on photonic time crystals. While conventional crystals are composed of repeating unit cells in space, such as eight carbon atoms arranged in a cube to form a diamond, a photonic time crystal has a structure that repeats in time. Theoretical predictions of photonic time crystals referred to designs consisting of three-dimensional metamaterials whose properties are difficult to manipulate in the laboratory. Wang and his collaborators have adapted the three-dimensional time crystal design to a two-dimensional metasurface. They arranged copper structures on the surface, using conventional printed circuit board technology. The structures look like a forest of mushrooms where the researchers placed a variable capacitor, known as a varactor, between each mushroom. To create the device, the researchers apply changing external voltages to the varactor, modulating the material’s electromagnetic properties in time. Wang then confirmed experimentally that this device amplified microwave signals that he sent across its surface. This work was published in a recent issue of Science Advances .…

MRS Bulletin Materials News Podcast

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Episode 9: Magnetic properties tunable in high-entropy oxides 4:04

vor 2 years4:04

4:04

Little research has been done on the magnetic properties of high-entropy oxides, a challenge taken up by Alannah Hallas at the University of British Columbia in Canada, interviewed by MRS Bulletin podcaster Laura Leay. Hallas’s research group began by choosing five elements that would be magnetic and combining them in oxide form, rendering a spinel structure for further experimentation. To understand how progressive substitution of the magnetic metal cations with non-magnetic gallium would affect the magnetic properties of the spinel, Hallas found that Ga substitution led to precise control of the configurational entropy, which may help to stabilize the spinel structure. Manganese, cobalt, and iron were redistributed throughout the structure whereas nickel and chromium were unaffected. Ga substitution led to the ability to tune the magnetic properties of the material in some unexpected ways that the research team calls “entropy engineering.” The ability to tune the properties may have applications for energy and data storage, for example, and could lead to more sustainable technologies. This work was published in a recent issue of the Journal of the American Chemical Society .…

MRS Bulletin Materials News Podcast

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Episode 8: Knots tied within microstructure of foam 4:51

vor 2 years4:51

4:51

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Widi Moestopo, a former graduate student in Julia Greer’s laboratory at the California Institute of Technology (Caltech) and now a postdoc at Lawrence Livermore National Laboratory about their work incorporating microknots in architected materials. Using two-photon lithography, Moestopo scans a resin with a laser to create and shape a three-dimensional (3D) object within foam. Moestopo then used a solvent to wash away the remaining, unconverted resin. In this way, he sculpted the knots out of the resin, rather than tying the knots like shoelaces. This 3D structure is formed from a lattice of 3D rhombuses, where each side of the rhombus consists of three strands of fiber. These fibers are woven around each other to form knots. The result is a materials with high deformability and tensile toughness. This work was published in a recent issue of Science Advances .…

MRS Bulletin Materials News Podcast

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Episode 7: Nanotwinned copper foil enables “zero excess” Li-metal batteries 4:04

vor 2 years4:04

4:04

In this podcast episode, MRS Bulletin’s Laura Leay interviews Dominic Bresser from the Helmholtz Institute Ulm and the Karlsruhe Institute of Technology in Germany about the suitability of a nanotwinned copper foil as a current collector for the negative electrode in“zero excess” lithium−metal batteries. The nanotwinned copper foil has an essentially pure, single orientation and dense twin boundaries. Bresser’s research group found that lithium deposits more densely and much more homogenously on this nanotwinned copper foil than on commercial foils. This work was published in a recent issue of ACS Applied Energy Materials .…

MRS Bulletin Materials News Podcast

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Episode 6: Electromagnetic induction enables micro-robots to better mimic biological organisms 3:08

vor 2 years3:08

3:08

In this podcast episode, MRS Bulletin’s Laura Leay interviews Carmel Majidi from Carnegie Mellon University about an adaptive-responsive soft micro-robot. The key is eliciting a liquid–solid phase transition through electromagnetic induction. In addition to using the magnetic field to induce the phase change, it can also be used to make the machine move. A soft, low-rigidity body is vital for adapting a miniature machine to a variety of applications or a changing environment. This work was published in a recent issue of Matter .…

MRS Bulletin Materials News Podcast

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Episode 5: Inkjet-printed material tailored for biocompatible wearable electronics 3:58

vor 2 years3:58

3:58

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Prof. Esma Ismailova and graduate student Marina Galliani from Mines Saint-Etienne about their work toward creating biocompatible, eco-friendly materials for wearable electronics. For this particular project, they developed a conducting material based on a commercial polymer known as PEDOT-PSS, in a water-based solution. They combined it with various solvents to tune the electrical conductivity, which is dependent on the shape and structure of the polymers in the material as they dry. The researchers tested the material’s conductivity on several substrates, including paper-based substrates and textiles. To make the material printable, they also needed to tune the material’s viscosity. Because the material relies on inkjet printers that are already commonly available, this material is relatively easy to incorporate into industrial processes. This work was published in a recent issue of APL Bioengineering .…

MRS Bulletin Materials News Podcast

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Episode 4: Optical waveguide enables self-healing soft robotic system 4:03

vor 2 years4:03

4:03

In this podcast episode, MRS Bulletin’s Laura Leay interviews Rob Shepherd from Cornell University about an adaptive-responsive self-healing soft robotic system. Shepherd’s research team has developed waveguides made of self-healing polyurethane urea crosslinked with aromatic sulfide bonds. When this material is cut, relatively weak hydrogen bonds quickly form. Disulfide exchange then occurs and, although this takes longer than the formation of hydrogen bonds, results in much stronger bonding and so recovering much of the mechanical strength of the polymer. Light is transmitted down the waveguide and, when the material is cut or punctured, the signal is attenuated. The loss of signal can be acted on by the robot and it can change its pattern of movement until the strong disulfide bonds are formed. This self-healing material absorbs more light than previous versions of the polymer that couldn’t effect a chemical repair. This level of light absorption is actually useful as it makes the robot more sensitive to damage or deformation. This work was published in a recent issue of Science Advances .…

MRS Bulletin Materials News Podcast

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Episode 3: Gold nanoparticles self-assemble into pinwheel superlattices 4:17

vor 2 years4:17

4:17

In this podcast episode, MRS Bulletin’s Sophia Chen interviews Jiahui Li, a graduate student at the University of Illinois Urbana-Champaign about designing structures out of gold nanoparticles. When the nanoparticle structure takes the shape of a pinwheel, different types of light interact with the structure differently due to its chirality. Different wavelengths might be transmitted depending on whether the light’s polarization is rotating clockwise or counterclockwise, which could make this structure useful for filtering light in optical applications. This work was published in a recent issue of Nature (https://doi.org/10.1038/s41586-022-05384-8).…

MRS Bulletin Materials News Podcast

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Episode 2: Real-time 3D imaging software for electron microscopy developed 3:24

vor 2 years3:24

3:24

In this podcast episode, MRS Bulletin’s Laura Leay interviews Robert Hovden from the University of Michigan and his graduate student Jonathan Schwartz on development of the freely available Tomviz platform (tomviz.org) that enables real-time three-dimensional (3D) visual analysis of materials. Building on the already existing Tomviz platform, Schwartz created new algorithms capable of pulling data from transmission and scanning electron microscopes, evolving the 3D image as the experiment progresses. This research is published in a recent issue of Nature Communications (https://doi.org/10.1038/s41467-022-32046-0).…

MRS Bulletin Materials News Podcast

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Episode 1: High-strength alloys created using thermally stable nanoparticles 4:17

vor 2 years4:17

4:17

In this podcast episode, MRS Bulletin’s Laura Leay interviews Tao Yang from the City University of Hong Kong in China who focuses on the innovative design of advanced structural materials. In the area of high-strength alloys, Yang’s research team looked specifically at how to stabilize nanoparticles at high temperatures. In an alloy of Ni59.9- x Co x Fe13-Cr15Al6Ti6B0.1, Yang’s team achieved ultra-stable nanoparticles at 800–1000°C. They achieved this effect by tailoring the concentration of cobalt. While nanoparticles have already been seen to improve the strength of materials, Yang’s team has provided insight into how this can be achieved at high temperatures. This research is published in a recent issue of Nature Communications (https://doi.org/10.1038/s41467-022-32620-6).…

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