Twisted and nematic
(Source: ScienceNOW)
Source: ScienceNOW - April 15, 2021 Category: Science Authors: Stajic, J. Tags: Materials Science, Physics twis Source Type: news

Combatting noise on the platform
(Source: ScienceNOW)
Source: ScienceNOW - April 15, 2021 Category: Science Authors: Szuromi, P. Tags: Materials Science twis Source Type: news

Nematicity and competing orders in superconducting magic-angle graphene
We report on the identification of intertwined phases with broken rotational symmetry in magic-angle twisted bilayer graphene (TBG). Using transverse resistance measurements, we find a strongly anisotropic phase located in a "wedge" above the underdoped region of the superconducting dome. Upon its crossing with the superconducting dome, a reduction of the critical temperature is observed. Furthermore, the superconducting state exhibits an anisotropic response to a direction-dependent in-plane magnetic field, revealing nematic ordering across the entire superconducting dome. These results indicate that nematic flu...
Source: ScienceNOW - April 15, 2021 Category: Science Authors: Cao, Y., Rodan-Legrain, D., Park, J. M., Yuan, N. F. Q., Watanabe, K., Taniguchi, T., Fernandes, R. M., Fu, L., Jarillo-Herrero, P. Tags: Materials Science, Physics r-articles Source Type: news

Materials challenges and opportunities for quantum computing hardware
Quantum computing hardware technologies have advanced during the past two decades, with the goal of building systems that can solve problems that are intractable on classical computers. The ability to realize large-scale systems depends on major advances in materials science, materials engineering, and new fabrication techniques. We identify key materials challenges that currently limit progress in five quantum computing hardware platforms, propose how to tackle these problems, and discuss some new areas for exploration. Addressing these materials challenges will require scientists and engineers to work together to create ...
Source: ScienceNOW - April 15, 2021 Category: Science Authors: de Leon, N. P., Itoh, K. M., Kim, D., Mehta, K. K., Northup, T. E., Paik, H., Palmer, B. S., Samarth, N., Sangtawesin, S., Steuerman, D. W. Tags: Materials Science, Online Only review Source Type: news

Seeded 2D epitaxy of large-area single-crystal films of the van der Waals semiconductor 2H MoTe2
We report a route for synthesizing wafer-scale single-crystalline 2H molybdenum ditelluride (MoTe2) semiconductors on an amorphous insulating substrate. In-plane 2D-epitaxy growth by tellurizing was triggered from a deliberately implanted single seed crystal. The resulting single-crystalline film completely covered a 2.5-centimeter wafer with excellent uniformity. The 2H MoTe2 2D single-crystalline film can use itself as a template for further rapid epitaxy in a vertical manner. Transistor arrays fabricated with the as-prepared 2H MoTe2 single crystals exhibited high electrical performance, with excellent uniformity and 10...
Source: ScienceNOW - April 8, 2021 Category: Science Authors: Xu, X., Pan, Y., Liu, S., Han, B., Gu, P., Li, S., Xu, W., Peng, Y., Han, Z., Chen, J., Gao, P., Ye, Y. Tags: Materials Science reports Source Type: news

Gate-controlled BCS-BEC crossover in a two-dimensional superconductor
We report crossover behavior from the BCS limit to the BEC limit realized by varying carrier density in a two-dimensional superconductor, electron-doped zirconium nitride chloride. The phase diagram, established by simultaneous measurements of resistivity and tunneling spectra under ionic gating, demonstrates a pseudogap phase in the low-doping regime. The ratio of the superconducting transition temperature and Fermi temperature in the low–carrier density limit is consistent with the theoretical upper bound expected in the BCS-BEC crossover regime. These results indicate that the gate-doped semiconductor provide...
Source: ScienceNOW - April 8, 2021 Category: Science Authors: Nakagawa, Y., Kasahara, Y., Nomoto, T., Arita, R., Nojima, T., Iwasa, Y. Tags: Materials Science, Physics reports Source Type: news

High-throughput injection molding of transparent fused silica glass
We present a process for glassworks using high-throughput IM of an amorphous silicon dioxide nanocomposite that combines established process technologies and low-energy sintering. We produce highly transparent glass using classical IM and sintering, allowing for a potentially substantial reduction in energy consumption. Our strategy merges polymer and glass processing, with substantial implications for glass utilization. (Source: ScienceNOW)
Source: ScienceNOW - April 8, 2021 Category: Science Authors: Mader, M., Schlatter, O., Heck, B., Warmbold, A., Dorn, A., Zappe, H., Risch, P., Helmer, D., Kotz, F., Rapp, B. E. Tags: Engineering, Materials Science reports Source Type: news

Designed proteins assemble antibodies into modular nanocages
Multivalent display of receptor-engaging antibodies or ligands can enhance their activity. Instead of achieving multivalency by attachment to preexisting scaffolds, here we unite form and function by the computational design of nanocages in which one structural component is an antibody or Fc-ligand fusion and the second is a designed antibody-binding homo-oligomer that drives nanocage assembly. Structures of eight nanocages determined by electron microscopy spanning dihedral, tetrahedral, octahedral, and icosahedral architectures with 2, 6, 12, and 30 antibodies per nanocage, respectively, closely match the corresponding c...
Source: ScienceNOW - April 1, 2021 Category: Science Authors: Divine, R., Dang, H. V., Ueda, G., Fallas, J. A., Vulovic, I., Sheffler, W., Saini, S., Zhao, Y. T., Raj, I. X., Morawski, P. A., Jennewein, M. F., Homad, L. J., Wan, Y.-H., Tooley, M. R., Seeger, F., Etemadi, A., Fahning, M. L., Lazarovits, J., Roederer, Tags: Biochemistry, Materials Science, Online Only r-articles Source Type: news

Integrating form and function for design
(Source: ScienceNOW)
Source: ScienceNOW - April 1, 2021 Category: Science Authors: Vinson, V. Tags: Biochemistry, Materials Science twis Source Type: news

Engineering interface polarization
(Source: ScienceNOW)
Source: ScienceNOW - April 1, 2021 Category: Science Authors: Szuromi, P. Tags: Materials Science, Physics twis Source Type: news

A van der Waals interface that creates in-plane polarization and a spontaneous photovoltaic effect
Van der Waals interfaces can be formed by layer stacking without regard to lattice constants or symmetries of individual building blocks. We engineered the symmetry of a van der Waals interface of tungsten selenide and black phosphorus and realized in-plane electronic polarization that led to the emergence of a spontaneous photovoltaic effect. Spontaneous photocurrent was observed along the polar direction and was absent in the direction perpendicular to it. The observed spontaneous photocurrent was explained by a quantum-mechanical shift current that reflects the geometrical and topological electronic nature of this emerg...
Source: ScienceNOW - April 1, 2021 Category: Science Authors: Akamatsu, T., Ideue, T., Zhou, L., Dong, Y., Kitamura, S., Yoshii, M., Yang, D., Onga, M., Nakagawa, Y., Watanabe, K., Taniguchi, T., Laurienzo, J., Huang, J., Ye, Z., Morimoto, T., Yuan, H., Iwasa, Y. Tags: Materials Science, Physics reports Source Type: news

Perovskite synthesis out in the open
(Source: ScienceNOW)
Source: ScienceNOW - March 25, 2021 Category: Science Authors: Szuromi, P. Tags: Materials Science twis Source Type: news

Nanorod alignment for optical asymmetry
(Source: ScienceNOW)
Source: ScienceNOW - March 25, 2021 Category: Science Authors: Szuromi, P. Tags: Chemistry, Materials Science twis Source Type: news

Stabilizing black-phase formamidinium perovskite formation at room temperature and high humidity
The stabilization of black-phase formamidinium lead iodide (α-FAPbI3) perovskite under various environmental conditions is considered necessary for solar cells. However, challenges remain regarding the temperature sensitivity of α-FAPbI3 and the requirements for strict humidity control in its processing. Here we report the synthesis of stable α-FAPbI3, regardless of humidity and temperature, based on a vertically aligned lead iodide thin film grown from an ionic liquid, methylamine formate. The vertically grown structure has numerous nanometer-scale ion channels that facilitate the permeation of formamidi...
Source: ScienceNOW - March 25, 2021 Category: Science Authors: Hui, W., Chao, L., Lu, H., Xia, F., Wei, Q., Su, Z., Niu, T., Tao, L., Du, B., Li, D., Wang, Y., Dong, H., Zuo, S., Li, B., Shi, W., Ran, X., Li, P., Zhang, H., Wu, Z., Ran, C., Song, L., Xing, G., Gao, X., Zhang, J., Xia, Y., Chen, Y., Huang, W. Tags: Materials Science reports Source Type: news

Enhanced optical asymmetry in supramolecular chiroplasmonic assemblies with long-range order
Chiral assemblies of plasmonic nanoparticles are known for strong circular dichroism but not for high optical asymmetry, which is limited by the unfavorable combination of electrical and magnetic field components compounded by strong scattering. Here, we show that these limitations can be overcome by the long-range organization of nanoparticles in a manner similar to the liquid crystals and found in helical assemblies of gold nanorods with human islet amyloid polypeptides. A strong, polarization-dependent spectral shift and the reduced scattering of energy states with antiparallel orientation of dipoles activated in assemb...
Source: ScienceNOW - March 25, 2021 Category: Science Authors: Lu, J., Xue, Y., Bernardino, K., Zhang, N.-N., Gomes, W. R., Ramesar, N. S., Liu, S., Hu, Z., Sun, T., de Moura, A. F., Kotov, N. A., Liu, K. Tags: Chemistry, Materials Science reports Source Type: news

Formlabs Launches Scan to Model Feature for PreForm Software to Ease Dental Professionals ’ Entry into Digital Dentistry
With this new feature, Formlabs enables dental professionals to turn 3D intraoral scans into printable models directly in PreForm, mitigating learning hurdles associated with complex dental CAD programs and enabling practices to easily digitize their workflows.Somerville, MA - March 18, 2021​–​Formlabs​, a leading 3D printing company, today announced Scan to Model, a new feature in its PreForm software, that is designed to convert intraoral scans into 3D printable models easily. Dental and orthodontic professionals can use Scan to Model as an entrypoint into digital workflows without having prior experience wit...
Source: Dental Technology Blog - March 18, 2021 Category: Dentistry Source Type: news

Overcoming propylene oxidation
(Source: ScienceNOW)
Source: ScienceNOW - March 18, 2021 Category: Science Authors: Szuromi, P. Tags: Chemistry, Materials Science twis Source Type: news

Tandem In2O3-Pt/Al2O3 catalyst for coupling of propane dehydrogenation to selective H2 combustion
Tandem catalysis couples multiple reactions and promises to improve chemical processing, but precise spatiotemporal control over reactive intermediates remains elusive. We used atomic layer deposition to grow In2O3 over Pt/Al2O3, and this nanostructure kinetically couples the domains through surface hydrogen atom transfer, resulting in propane dehydrogenation (PDH) to propylene by platinum, then selective hydrogen combustion by In2O3, without excessive hydrocarbon combustion. Other nanostructures, including platinum on In2O3 or platinum mixed with In2O3, favor propane combustion because they cannot organize the reactions s...
Source: ScienceNOW - March 18, 2021 Category: Science Authors: Yan, H., He, K., Samek, I. A., Jing, D., Nanda, M. G., Stair, P. C., Notestein, J. M. Tags: Chemistry, Materials Science reports Source Type: news

Chiral-induced spin selectivity enables a room-temperature spin light-emitting diode
In traditional optoelectronic approaches, control over spin, charge, and light requires the use of both electrical and magnetic fields. In a spin-polarized light-emitting diode (spin-LED), charges are injected, and circularly polarized light is emitted from spin-polarized carrier pairs. Typically, the injection of carriers occurs with the application of an electric field, whereas spin polarization can be achieved using an applied magnetic field or polarized ferromagnetic contacts. We used chiral-induced spin selectivity (CISS) to produce spin-polarized carriers and demonstrate a spin-LED that operates at room temperature w...
Source: ScienceNOW - March 11, 2021 Category: Science Authors: Kim, Y.-H., Zhai, Y., Lu, H., Pan, X., Xiao, C., Gaulding, E. A., Harvey, S. P., Berry, J. J., Vardeny, Z. V., Luther, J. M., Beard, M. C. Tags: Chemistry, Materials Science reports Source Type: news

Synthesis of borophane polymorphs through hydrogenation of borophene
Synthetic two-dimensional polymorphs of boron, or borophene, have attracted attention because of their anisotropic metallicity, correlated-electron phenomena, and diverse superlattice structures. Although borophene heterostructures have been realized, ordered chemical modification of borophene has not yet been reported. Here, we synthesize "borophane" polymorphs by hydrogenating borophene with atomic hydrogen in ultrahigh vacuum. Through atomic-scale imaging, spectroscopy, and first-principles calculations, the most prevalent borophane polymorph is shown to possess a combination of two-center–two-electron b...
Source: ScienceNOW - March 11, 2021 Category: Science Authors: Li, Q., Kolluru, V. S. C., Rahn, M. S., Schwenker, E., Li, S., Hennig, R. G., Darancet, P., Chan, M. K. Y., Hersam, M. C. Tags: Chemistry, Materials Science reports Source Type: news

Spin injection sans magnetism
(Source: ScienceNOW)
Source: ScienceNOW - March 11, 2021 Category: Science Authors: Szuromi, P. Tags: Chemistry, Materials Science twis Source Type: news

Hydrogenating borophene
(Source: ScienceNOW)
Source: ScienceNOW - March 11, 2021 Category: Science Authors: Szuromi, P. Tags: Chemistry, Materials Science twis Source Type: news

Toroidal polar topology in strained ferroelectric polymer
We report toroidal topological texture self-organized in a ferroelectric polymer, poly(vinylidene fluoride-ran-trifluoroethylene) [P(VDF-TrFE)], that exhibits concentric topology with anticoupled chiral domains. The interplay among the elastic, electric, and gradient energies results in continuous rotation and toroidal assembly of the polarization perpendicular to polymer chains, whereas relaxor behavior is induced along polymer chains. Such toroidal polar topology gives rise to periodic absorption of polarized far-infrared (FIR) waves, enabling the manipulation of the terahertz wave on a mesoscopic scale. Our observations...
Source: ScienceNOW - March 4, 2021 Category: Science Authors: Guo, M., Guo, C., Han, J., Chen, S., He, S., Tang, T., Li, Q., Strzalka, J., Ma, J., Yi, D., Wang, K., Xu, B., Gao, P., Huang, H., Chen, L.-Q., Zhang, S., Lin, Y.-H., Nan, C.-W., Shen, Y. Tags: Materials Science reports Source Type: news

Scaling behavior of stiffness and strength of hierarchical network nanomaterials
Structural hierarchy can enhance the mechanical behavior of materials and systems. This is exemplified by the fracture toughness of nacre or enamel in nature and by human-made architected microscale network structures. Nanoscale structuring promises further strengthening, yet macroscopic bodies built this way contain an immense number of struts, calling for scalable preparation schemes. In this work, we demonstrated macroscopic hierarchical network nanomaterials made by the self-organization processes of dealloying. Their hierarchical architecture affords enhanced strength and stiffness at a given solid fraction, and it en...
Source: ScienceNOW - March 4, 2021 Category: Science Authors: Shi, S., Li, Y., Ngo-Dinh, B.-N., Markmann, J., Weissmüller, J. Tags: Materials Science r-articles Source Type: news

Whirls and swirls of polarization
(Source: ScienceNOW)
Source: ScienceNOW - March 4, 2021 Category: Science Authors: Martin, L. W. Tags: Materials Science perspective Source Type: news

A two-stage lightweighting
(Source: ScienceNOW)
Source: ScienceNOW - March 4, 2021 Category: Science Authors: Grocholski, B. Tags: Materials Science twis Source Type: news

Polarization hits a bull's-eye
(Source: ScienceNOW)
Source: ScienceNOW - March 4, 2021 Category: Science Authors: Grocholski, B. Tags: Materials Science twis Source Type: news

A materials science approach to combating coronavirus
(Tokyo Institute of Technology) Researchers at Tokyo Institute of Technology working in collaboration with colleagues at the Kanagawa Institute of Industrial Science and Technology and Nara Medical University in Japan have succeeded in preparing a material called cerium molybdate (γ-Ce2Mo3O13 or CMO), which exhibits high antiviral activity against coronavirus. (Source: EurekAlert! - Biology)
Source: EurekAlert! - Biology - March 2, 2021 Category: Biology Source Type: news

New study proposes a low cost, high efficiency mask design
(Oxford University Press USA) A new paper in Oxford Open Materials Science, published by Oxford University Press, presents low cost modifications to existing N95 masks that prolongs their effectiveness and improves their re-usability post disinfectants. (Source: EurekAlert! - Infectious and Emerging Diseases)
Source: EurekAlert! - Infectious and Emerging Diseases - March 2, 2021 Category: Infectious Diseases Source Type: news

Improving durability of dental structures
(Charit é - Universit ä tsmedizin Berlin) How can dental restorations - such as fillings and crowns - be made to last longer? A new research group centered at Charit é - Universit ä tsmedizin Berlin and Technische Universit ä t (TU) Berlin plans to address this topic by utilizing approaches from both materials science and dentistry. The aim is to gain a better understanding of the composition and structure of the material-tissue interfaces and the stresses exerted on them. (Source: EurekAlert! - Medicine and Health)
Source: EurekAlert! - Medicine and Health - February 26, 2021 Category: International Medicine & Public Health Source Type: news

Comment on "Resolving spatial and energetic distributions of trap states in metal halide perovskite solar cells"
Ni et al. (Research Articles, 20 March 2020, p. 1352) report bulk trap densities of 1011 cm–3 and an increase in interfacial trap densities by one to four orders of magnitude from drive-level capacitance profiling of lead halide perovskites. From electrostatic arguments, we show that the results are not trap densities but are a consequence of the geometrical capacitance and charge injection into the perovskite layer. (Source: ScienceNOW)
Source: ScienceNOW - February 25, 2021 Category: Science Authors: Ravishankar, S., Unold, T., Kirchartz, T. Tags: Physics, Applied, Materials Science t-comment Source Type: news

Absolute and arbitrary orientation of single-molecule shapes
We present a DNA origami molecule whose energy landscape on lithographic binding sites has a unique maximum. This property enabled device alignment within 3.2° on silica surfaces. Orientation was absolute (all degrees of freedom were specified) and arbitrary (the orientation of every molecule was independently specified). The use of orientation to optimize device performance was shown by aligning fluorescent emission dipoles within microfabricated optical cavities. Large-scale integration was demonstrated with an array of 3456 DNA origami with 12 distinct orientations that indicated the polarization of excitation light...
Source: ScienceNOW - February 18, 2021 Category: Science Authors: Gopinath, A., Thachuk, C., Mitskovets, A., Atwater, H. A., Kirkpatrick, D., Rothemund, P. W. K. Tags: Physics, Applied, Materials Science, Online Only r-articles Source Type: news

High-entropy-stabilized chalcogenides with high thermoelectric performance
Thermoelectric technology generates electricity from waste heat, but one bottleneck for wider use is the performance of thermoelectric materials. Manipulating the configurational entropy of a material by introducing different atomic species can tune phase composition and extend the performance optimization space. We enhanced the figure of merit (zT) value to 1.8 at 900 kelvin in an n-type PbSe-based high-entropy material formed by entropy-driven structural stabilization. The largely distorted lattices in this high-entropy system caused unusual shear strains, which provided strong phonon scattering to largely lower lattice ...
Source: ScienceNOW - February 18, 2021 Category: Science Authors: Jiang, B., Yu, Y., Cui, J., Liu, X., Xie, L., Liao, J., Zhang, Q., Huang, Y., Ning, S., Jia, B., Zhu, B., Bai, S., Chen, L., Pennycook, S. J., He, J. Tags: Physics, Applied, Materials Science reports Source Type: news

Orienting origami binding
(Source: ScienceNOW)
Source: ScienceNOW - February 18, 2021 Category: Science Authors: Szuromi, P. Tags: Physics, Applied, Materials Science twis Source Type: news

Distorted thermal properties
(Source: ScienceNOW)
Source: ScienceNOW - February 18, 2021 Category: Science Authors: Grocholski, B. Tags: Physics, Applied, Materials Science twis Source Type: news

Clemson embarks on new era as member of Battelle Savannah River Alliance to manage SRNL
(Clemson University) As a member of the BSRA team, Clemson experts will provide technical support on environmental remediation, waste management, materials science, computational modeling, advanced manufacturing, cybersecurity and numerous other research topics. (Source: EurekAlert! - Biology)
Source: EurekAlert! - Biology - February 16, 2021 Category: Biology Source Type: news

Greener materials: Scientists use algae to make light carbon fibers that are as hard as steel
(Natural News) Algae is a diverse group of aquatic organisms capable of producing oxygen and absorbing carbon dioxide from the atmosphere. Scientists have been studying algae for their potential as a source of fuel, but many others are also starting to explore algae’s immense potential in biotechnology. In the algae technical facility at the Technical University... (Source: NaturalNews.com)
Source: NaturalNews.com - February 15, 2021 Category: Consumer Health News Source Type: news

Kinesin takes substeps
(Source: ScienceNOW)
Source: ScienceNOW - February 11, 2021 Category: Science Authors: Jiang, D. Tags: Biochemistry, Materials Science twis Source Type: news

Ordering up better conductivity
(Source: ScienceNOW)
Source: ScienceNOW - February 11, 2021 Category: Science Authors: Grocholski, B. Tags: Chemistry, Materials Science twis Source Type: news

Enhanced atomic ordering leads to high thermoelectric performance in AgSbTe2
High thermoelectric performance is generally achieved through either electronic structure modulations or phonon scattering enhancements, which often counteract each other. A leap in performance requires innovative strategies that simultaneously optimize electronic and phonon transports. We demonstrate high thermoelectric performance with a near room-temperature figure of merit, ZT ~ 1.5, and a maximum ZT ~ 2.6 at 573 kelvin, by optimizing atomic disorder in cadmium-doped polycrystalline silver antimony telluride (AgSbTe2). Cadmium doping in AgSbTe2 enhances cationic ordering, which simultaneously improves electronic proper...
Source: ScienceNOW - February 11, 2021 Category: Science Authors: Roychowdhury, S., Ghosh, T., Arora, R., Samanta, M., Xie, L., Singh, N. K., Soni, A., He, J., Waghmare, U. V., Biswas, K. Tags: Chemistry, Materials Science reports Source Type: news

Germanium nanospheres for ultraresolution picotensiometry of kinesin motors
Kinesin motors are essential for the transport of cellular cargo along microtubules. How the motors step, detach, and cooperate with each other is still unclear. To dissect the molecular motion of kinesin-1, we developed germanium nanospheres as ultraresolution optical trapping probes. We found that single motors took 4-nanometer center-of-mass steps. Furthermore, kinesin-1 never detached from microtubules under hindering load conditions. Instead, it slipped on microtubules in microsecond-long, 8-nanometer steps and remained in this slip state before detaching or reengaging in directed motion. Unexpectedly, reengagement an...
Source: ScienceNOW - February 11, 2021 Category: Science Authors: Sudhakar, S., Abdosamadi, M. K., Jachowski, T. J., Bugiel, M., Jannasch, A., Schäffer, E. Tags: Biochemistry, Materials Science, Online Only r-articles Source Type: news

A-sites join the band edge
(Source: ScienceNOW)
Source: ScienceNOW - February 4, 2021 Category: Science Authors: Szuromi, P. Tags: Materials Science twis Source Type: news

Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations
We report a -conjugation–induced extension of electronic states of A-site cations that affects perovskite frontier orbitals. The -conjugated pyrene-containing A-site cations electronically contribute to the surface band edges and influence the carrier dynamics, with a properly tailored intercalation distance between layers of the inorganic framework. The ethylammonium pyrene increased hole mobilities, improved power conversion efficiencies relative to that of a reference perovskite, and enhanced device stability. (Source: ScienceNOW)
Source: ScienceNOW - February 4, 2021 Category: Science Authors: Xue, J., Wang, R., Chen, X., Yao, C., Jin, X., Wang, K.-L., Huang, W., Huang, T., Zhao, Y., Zhai, Y., Meng, D., Tan, S., Liu, R., Wang, Z.-K., Zhu, C., Zhu, K., Beard, M. C., Yan, Y., Yang, Y. Tags: Materials Science reports Source Type: news

Reversible disorder-order transitions in atomic crystal nucleation
Nucleation in atomic crystallization remains poorly understood, despite advances in classical nucleation theory. The nucleation process has been described to involve a nonclassical mechanism that includes a spontaneous transition from disordered to crystalline states, but a detailed understanding of dynamics requires further investigation. In situ electron microscopy of heterogeneous nucleation of individual gold nanocrystals with millisecond temporal resolution shows that the early stage of atomic crystallization proceeds through dynamic structural fluctuations between disordered and crystalline states, rather than throug...
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Jeon, S., Heo, T., Hwang, S.-Y., Ciston, J., Bustillo, K. C., Reed, B. W., Ham, J., Kang, S., Kim, S., Lim, J., Lim, K., Kim, J. S., Kang, M.-H., Bloom, R. S., Hong, S., Kim, K., Zettl, A., Kim, W. Y., Ercius, P., Park, J., Lee, W. C. Tags: Chemistry, Materials Science reports Source Type: news

Watching early stage nucleation
(Source: ScienceNOW)
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Lavine, M. S. Tags: Chemistry, Materials Science twis Source Type: news

Pump it up
(Source: ScienceNOW)
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Lavine, M. S. Tags: Materials Science twis Source Type: news

Unipolar stroke, electroosmotic pump carbon nanotube yarn muscles
Success in making artificial muscles that are faster and more powerful and that provide larger strokes would expand their applications. Electrochemical carbon nanotube yarn muscles are of special interest because of their relatively high energy conversion efficiencies. However, they are bipolar, meaning that they do not monotonically expand or contract over the available potential range. This limits muscle stroke and work capacity. Here, we describe unipolar stroke carbon nanotube yarn muscles in which muscle stroke changes between extreme potentials are additive and muscle stroke substantially increases with increasing po...
Source: ScienceNOW - January 28, 2021 Category: Science Authors: Chu, H., Hu, X., Wang, Z., Mu, J., Li, N., Zhou, X., Fang, S., Haines, C. S., Park, J. W., Qin, S., Yuan, N., Xu, J., Tawfick, S., Kim, H., Conlin, P., Cho, M., Cho, K., Oh, J., Nielsen, S., Alberto, K. A., Razal, J. M., Foroughi, J., Spinks, G. M., Kim, Tags: Materials Science reports Source Type: news

New research project on sustainable electronics promises to reduce e-waste problem
(Aarhus University) A new research project aims to tackle the ever-growing problem of electronic waste by merging materials science and printed electronics technology and creating novel electronically functional materials that are completely biologically degradable. The project is headed by Assistant Professor Shweta Agarwala from Aarhus University, Denmark, who's just received a grant of EUR 810.000 from the Villum Foundation. (Source: EurekAlert! - Biology)
Source: EurekAlert! - Biology - January 25, 2021 Category: Biology Source Type: news

Nanoscale localized contacts for high fill factors in polymer-passivated perovskite solar cells
Polymer passivation layers can improve the open-circuit voltage of perovskite solar cells when inserted at the perovskite–charge transport layer interfaces. Unfortunately, many such layers are poor conductors, leading to a trade-off between passivation quality (voltage) and series resistance (fill factor, FF). Here, we introduce a nanopatterned electron transport layer that overcomes this trade-off by modifying the spatial distribution of the passivation layer to form nanoscale localized charge transport pathways through an otherwise passivated interface, thereby providing both effective passivation and excellent cha...
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Peng, J., Walter, D., Ren, Y., Tebyetekerwa, M., Wu, Y., Duong, T., Lin, Q., Li, J., Lu, T., Mahmud, M. A., Lem, O. L. C., Zhao, S., Liu, W., Liu, Y., Shen, H., Li, L., Kremer, F., Nguyen, H. T., Choi, D.-Y., Weber, K. J., Catchpole, K. R., White, T. P. Tags: Engineering, Materials Science reports Source Type: news

Ultrafast nanoimaging of the order parameter in a structural phase transition
Understanding microscopic processes in materials and devices that can be switched by light requires experimental access to dynamics on nanometer length and femtosecond time scales. Here, we introduce ultrafast dark-field electron microscopy to map the order parameter across a structural phase transition. We use ultrashort laser pulses to locally excite a 1T-TaS2 (1T-polytype of tantalum disulfide) thin film and image the transient state of the specimen by ultrashort electron pulses. A tailored dark-field aperture array allows us to track the evolution of charge-density wave domains in the material with simultaneous femtose...
Source: ScienceNOW - January 21, 2021 Category: Science Authors: Danz, T., Domröse, T., Ropers, C. Tags: Materials Science, Physics reports Source Type: news