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Today: 28 February 2020, Friday.

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#1

 

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Description Fluid states of matter can locally exhibit characteristics of the onset of crystalline order. Traditionally this has been theoretically investigated using multipoint correlation functions. However new measurement techniques now allow multiparticle configurations of cold atomic systems to be observed directly. This has led to a search for new techniques to characterize the configurations that are likely to be observed. One of these techniques is the configuration density (CD), which has been used to argue for the formation of “Pauli crystals” by non-interacting electrons in e.g. a harmonic trap. We show here that such Pauli crystals do not exist, but that other other interesting spatial structures can occur in the form of an “anti-Crystal”, where the fermions preferentially avoid a lattice of positions surrounding any given fermion. Further, we show that configuration densities must be treated with great care as naive application can lead to the identification of crystalline structures which are artifacts of the method and of no physical significance. We analyze the failure of the CD and suggest methods that might be more suitable for characterizing multiparticle correlations which may signal the onset of crystalline order. In particular, we introduce neighbour counting statistics (NCS), which is the full counting statistics of the particle number in a neighborhood of a given particle. We test this on two dimensional systems with emerging triangular and square crystal structures.

#Materials
Field # Materials
Updated 28 February 2020

#2

 

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Description TBD

#Materials
Field # Materials
Updated 28 February 2020

#3

 

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Description Scientists around the world are interested in developing new materials to help people live more sustainable and healthy lives, but the quest to produce these materials requires detailed knowledge of the mysterious structures of the molecules they are made from. Designers want to replace wasteful pla

#Materials
Field # Materials
Updated 28 February 2020

#4

 

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Description University of Manchester researchers have made a leap forward in overcoming one of the biggest problems in membrane technology- membrane fouling. Membrane-based separations are essential for various processes, such as water filtration and oil and gas separation. The use of graphene and other 2D m

#Materials
Field # Materials
Updated 28 February 2020

#5

 

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Description A team of Northwestern University materials science researchers has developed a new method of viewing the dynamic motion of atoms in atomically thin 2D materials. Funded by the National Science Foundation, the imaging technique reveals the underlying cause behind the performance failure of MoS2,

#Materials
Field # Materials
Updated 28 February 2020

#6

 

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Description The supramolecular self-assembly of a push-pull dye is investigated using scanning tunneling microscopy (STM) at the liquid–solid interface. The molecule has an indandione head, a bithiophene backbone and a triphenylamine–bithiophene moiety functionalized with two carboxylic acid groups as a tail. The STM images show that the molecules adopt an “L” shape on the surface and form chiral Baravelle spiral triangular trimers at low solution concentrations. The assembly of these triangular chiral trimers on the graphite surface results in the formation of two types of chiral Kagomé nanoarchitectures. The Kagomé-α structure is composed of only one trimer enantiomer, whereas the Kagomé-β structure results from the arrangement of two trimer enantiomers in a 1:1 ratio. These Kagomé lattices are stabilized by intermolecular O-H···O hydrogen bonds between carboxylic acid groups. These observations reveal that the complex structure of the push-pull dye molecule leads to the formation of sophisticated two-dimensional chiral Kagomé nanoarchitectures. The subsequent deposition of coronene molecules leads to the disappearance of the Kagomé-β structure, whereas the Kagomé-α structure acts as the host template to trap the coronene molecules. A thin film that spontaneously forms into complex geometric patterns can undergo molecular recognition interactions helpful for sensing small molecules. A team led by Xinrui Miao from the South China University of Technology in Guangzhou and Fabien Silly at the Université Paris-Saclay in Gif sur Yvette, France, used scanning tunneling microscopy to understand how photoactive dyes commonly used in organic solar cells self-organize into assemblies. The team first modified the dyes with carboxylic acids, giving them a spiral structure and enhanced hydrogen bonding capabilities. Atomic-scale imaging of the molecules on graphite revealed that at certain concentrations, groups of dyes could lock together into triangular tiles. In turn, the tiles connected into symmetric lattices containing nanoscale pores. Certain lattices could trap aromatic hydrocarbons within their hexagonal pores. Push-pull dye molecules self-assemble into two 2D Kagomé nanoarchitectures composed of a single or two chiral Baravelle spiral triangular trimer enantiomers. Only one of the two nanoarchitectures is able to trap coronene molecules.

#Materials
Field # Materials
Updated 28 February 2020

#7

 

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Description Scientists in South Korea have demonstrated that graphene forms a hybrid layer with copper oxide to slow down further corrosion of copper metal.

#Materials
Field # Materials
Updated 28 February 2020

#8

 

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Description TBD

#Materials
Field # Materials
Updated 27 February 2020

#9

 

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Description Asked by: Glyn Leaney, Ashford

#Materials
Field # Materials
Updated 27 February 2020

#10

 

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Description Through engineering of oxygen stacking and cation–cation interactions, a methodology to design high-energy and long-cycle-life lithium-rich battery materials is proposed.

#Materials
Field # Materials
Updated 27 February 2020

#11

 

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Description Combining high-throughput screening and machine learning models is a rapidly developed direction for the exploration of novel optoelectronic functional materials. Here, we employ random forests regression (RFR) model to investigate the second harmonic generation (SHG) coefficients of nonlinear optical crystals with distinct diamond-like (DL) structures. 61 DL structures in Inorganic Crystallographic Structure Database (ICSD) are selected, and four distinctive descriptors, including band gap, electronegativity, group volume and bond flexibility, are used to model and predict second-order nonlinearity. It is demonstrated that the RFR model has reached the first-principles calculation accuracy, and gives validated predictions for a variety of representative DL crystals. Additionally, this model shows promising applications to explore new crystal materials of quaternary DL system with superior mid-IR NLO performances. Two new potential NLO crystals, Li2CuPS4 with ultrawide bandgap and Cu2CdSnTe4 with giant SHG response, are identified by this model.

#Materials
Field # Materials
Updated 26 February 2020

#12

 

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Description This study finds that phages produced by Pseudomonas aeruginosa form a shield around the bacteria and protect them from antibiotics.

#Materials
Field # Materials
Updated 25 February 2020

#13

 

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Description Bending of few-layer graphene leads to interlayer slip, and slipping lowers the bending stiffness. Beyond a critical bending angle, the graphene layers bend like a stack of paper, with a state of superlubricity for interlayer slip.

#Materials
Field # Materials
Updated 25 February 2020

#14

 

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Description Materials whose electronic and magnetic properties can be significantly changed by applying electrical inputs form the backbone of all of modern electronics. But achieving the same kind of tunable control over the thermal conductivity of any material has been an elusive quest. Now, a team of rese

#Materials
Field # Materials
Updated 25 February 2020

#15

 

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Description MIT researchers led by Evelyn Wang and Gang Chen are working to make a silica aerogel that's truly transparent so it can be incorporated into windows, where it would act as a good heat barrier but still allow occupants to see out.

#Materials
Field # Materials
Updated 25 February 2020

#16

 

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Description This is a turning point for nanofluidics. Recent progress allows envisioning both fundamental discoveries for the transport of fluids at the ultimate scales, and disruptive technologies for the water–energy nexus.

#Materials
Field # Materials
Updated 25 February 2020

#17

 

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Description This is a turning point for nanofluidics. Recent progress allows envisioning both fundamental discoveries for the transport of fluids at the ultimate scales, and disruptive technologies for the water–energy nexus.

#Materials
Field # Materials
Updated 25 February 2020

#18

 

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Description Laura Benzonana and Nikos Sgantzis reflect on their experience as organizers for Pint of Science in Greece.

#Materials
Field # Materials
Updated 25 February 2020

#19

 

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Description Laura Benzonana and Nikos Sgantzis reflect on their experience as organizers for Pint of Science in Greece.

#Materials
Field # Materials
Updated 25 February 2020

#20

 

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Description Researchers have discovered how to vary thermal conductivity bidirectionally by more than a factor of 10, simply by changing an electrical voltage, which could lead to new applications in energy storage.

#Materials
Field # Materials
Updated 24 February 2020

#21

 

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Description Scientists in Japan have developed a luminescent polymer that can quickly and sensitively detect stress.

#Materials
Field # Materials
Updated 24 February 2020

#22

 

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Description TBD

#Materials
Field # Materials
Updated 23 February 2020

#23

 

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Description TBD

#Materials
Field # Materials
Updated 22 February 2020

#24

 

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Description TBD

#Materials
Field # Materials
Updated 21 February 2020