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https://www.readbyqxmd.com/read/28812868/light-and-strong-hierarchical-porous-sic-foam-for-efficient-electromagnetic-interference-shielding-and-thermal-insulation-at-elevated-temperatures
#1
Caiyun Liang, Zhenfeng Wang, Lina Wu, Xiaochen Zhang, Huan Wang, Zhijiang Wang
A novel light but strong SiC foam with hierarchical porous architecture are fabricated by using dough as raw material via carbonization and followed carbothermal reduction with silicon source. A significant synergistic effect is achieved by embedding meso and nano pores in micro-sized porous skeleton, which endows the SiC foam with high-performance electromagnetic interference shielding (EMI), thermal insulation and mechanical properties. The micro-sized skeleton withstands the high stress. The meso- and nano-sized pores enhance the multiple reflection of the incident electromagnetic waves and elongate the path of heat transfer...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812342/achieving-a-collapsible-strong-and-highly-thermally-conductive-film-based-on-oriented-functionalized-boron-nitride-nanosheets-and-cellulose-nanofiber
#2
Kai Wu, Jinchao Fang, Jinrui Ma, Rui Huang, Songgang Chai, Feng Chen, Qiang Fu
Boron nitride nanosheets (BNNS) film receives wide attention in both academia and industry due to its high thermal conductivity (TC) and good electrical insulation capability. However, the brittleness and low strength of BNNS film largely limit its application. Herein, functionalized BNNS (f-BNNS) with well-maintained in-plane crystalline structure was firstly prepared utilizing urea in the aqueous solution via ball-milling for the purpose of improving its stability in water and enhancing the interaction with polymer matrix...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805649/aging-resistant-nanofluids-containing-covalent-functionalized-boron-nitride-nanosheets
#3
Dongju Lee, Jin-Ju Park, Min-Ku Lee, Gyoung-Ja Lee
Developing a thermally stable nanofluid that can maintain good thermo-conductive and flow performance at moderate or elevated temperatures for prolonged periods of time is a great challenge in heat transfer applications. Here, the thermal conductivity and rheological properties as well as their thermal stability characteristics of a nanofluid containing two-dimensional (2D) hexagonal boron nitride nanosheets (h-BNNSs) in ethylene glycol (EG) are presented, in comparison with those for a graphene oxide (GO) nanofluid as a counterpart...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28799750/complex-electron-transfer-pathway-at-a-microelectrode-captured-by-in-situ-nanospectroscopy
#4
Thomas Touzalin, Suzanne Joiret, Emmanuel Maisonhaute, Ivan Thomas Lucas
In the quest for analytical tools which enable the characterization of materials at the nanoscale and under the condition of their operation (in situ, operando), the emerging Tip-Enhanced Raman Spectroscopy (TERS) now enters the spotlight. We demonstrate in this work that a TERS tip can be functionalized and partially insulated to be used as a microelectrode enabling Electrochemical Substrate Enhanced Raman Spectroscopy (EC-SERS) at a single hotspot. This "SERS at a tip" experiment enables to capture the electrochemical transformation of a molecular layer self-assembled on a tapered gold microe-lectrode...
August 11, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28796949/mecp2-and-ctcf-enhancing-the-cross-talk-of-silencers
#5
Juan Ausio, Philippe T Georgel
This paper provides a brief introductory review of the most recent advances in our knowledge about structural and functional aspects of two transcriptional regulators: the methyl-CpG protein binding 2 (MeCP2), a protein whose mutated forms are involved in Rett syndrome and CCCTC-binding factor (CTCF), a constitutive transcriptional insulator. This is followed by a description of the post-translational modifications (PTMs) affecting these two proteins and an analysis of their known interacting partners. A special emphasis is placed on the recent studies connecting these two proteins focusing on the still poorly understood potential structural and functional interactions between the two of them on the chromatin substrate...
August 10, 2017: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28792931/chaotic-dynamics-in-nanoscale-nbo2-mott-memristors-for-analogue-computing
#6
Suhas Kumar, John Paul Strachan, R Stanley Williams
At present, machine learning systems use simplified neuron models that lack the rich nonlinear phenomena observed in biological systems, which display spatio-temporal cooperative dynamics. There is evidence that neurons operate in a regime called the edge of chaos that may be central to complexity, learning efficiency, adaptability and analogue (non-Boolean) computation in brains. Neural networks have exhibited enhanced computational complexity when operated at the edge of chaos, and networks of chaotic elements have been proposed for solving combinatorial or global optimization problems...
August 9, 2017: Nature
https://www.readbyqxmd.com/read/28790181/anomalous-relaxation-kinetics-and-charge-density-wave-correlations-in-underdoped-bapb1-x-bi-x-o3
#7
D Nicoletti, E Casandruc, D Fu, P Giraldo-Gallo, I R Fisher, A Cavalleri
Superconductivity often emerges in proximity of other symmetry-breaking ground states, such as antiferromagnetism or charge-density-wave (CDW) order. However, the subtle interrelation of these phases remains poorly understood, and in some cases even the existence of short-range correlations for superconducting compositions is uncertain. In such circumstances, ultrafast experiments can provide new insights by tracking the relaxation kinetics following excitation at frequencies related to the broken-symmetry state...
August 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28777633/antiferroelectric-topological-insulators-in-orthorhombic-amgbi-compounds-a-li-na-k
#8
Bartomeu Monserrat, Joseph W Bennett, Karin M Rabe, David Vanderbilt
We introduce antiferroelectric topological insulators as a new class of functional materials in which an electric field can be used to control topological order and induce topological phase transitions. Using first principles methods, we predict that several alkali-MgBi orthorhombic members of an ABC family of compounds are antiferroelectric topological insulators. We also show that epitaxial strain and hydrostatic pressure can be used to tune the topological order and the band gap of these ABC compounds. Antiferroelectric topological insulators could enable precise control of topology using electric fields, enhancing the applicability of topological materials in electronics and spintronics...
July 21, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28776052/hot-plasmonic-electron-driven-catalytic-reactions-on-patterned-metal-insulator-metal-nanostructures
#9
Sun Mi Kim, Changhwan Lee, Kalyan C Goddeti, Jeong Young Park
The smart design of plasmonic nanostructures offers a unique capability for the efficient conversion of solar energy into chemical energy by strong interactions with resonant photons through the excitation of surface plasmon resonance, which increases the prospect of using sunlight in environmental and energy applications. Here, we show that the catalytic activity of CO oxidation can be tuned by using new model systems: two-dimensional (2D) arrays of metal-insulator-metal (MIM) plasmonic nanoislands designed to efficiently shuttle hot plasmonic electrons...
August 4, 2017: Nanoscale
https://www.readbyqxmd.com/read/28775264/magnesium-oxide-mgo-ph-sensitive-sensing-membrane-in-electrolyte-insulator-semiconductor-structures-with-cf4-plasma-treatment
#10
Chyuan-Haur Kao, Chia Lung Chang, Wei Ming Su, Yu Tzu Chen, Chien Cheng Lu, Yu Shan Lee, Chen Hao Hong, Chan-Yu Lin, Hsiang Chen
Magnesium oxide (MgO) sensing membranes in pH-sensitive electrolyte-insulator-semiconductor structures were fabricated on silicon substrate. To optimize the sensing capability of the membrane, CF4 plasma was incorporated to improve the material quality of MgO films. Multiple material analyses including FESEM, XRD, AFM, and SIMS indicate that plasma treatment might enhance the crystallization and increase the grain size. Therefore, the sensing behaviors in terms of sensitivity, linearity, hysteresis effects, and drift rates might be improved...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28774110/electroconductive-composites-from-polystyrene-block-copolymers-and-cu-alumina-filler
#11
QuratulAin Nadeem, Tasneem Fatima, Pepijn Prinsen, Aziz Ur Rehman, Rohama Gill, Rashid Mahmood, Rafael Luque
Technological advancements and development of new materials may lead to the manufacture of sustainable energy-conducting devices used in the energy sector. This research attempts to fabricate novel electroconductive and mechanically stable nanocomposites via an electroless deposition (ELD) technique using electrically insulating materials. Metallic Cu is coated onto Al₂O₃ by ELD, and the prepared filler is then integrated (2-14 wt %) into a matrix of polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene-graft-maleic anhydride (PS-b-(PE-r-B)-b-PS-g-MA)...
December 7, 2016: Materials
https://www.readbyqxmd.com/read/28773939/surface-characterization-corrosion-resistance-and-in-vitro-biocompatibility-of-a-new-ti-hf-mo-sn-alloy
#12
Raluca Ion, Silviu Iulian Drob, Muhammad Farzik Ijaz, Cora Vasilescu, Petre Osiceanu, Doina-Margareta Gordin, Anisoara Cimpean, Thierry Gloriant
A new superelastic Ti-23Hf-3Mo-4Sn biomedical alloy displaying a particularly large recovery strain was synthesized and characterized in this study. Its native passive film is very thick (18 nm) and contains very protective TiO2, Ti2O3, HfO2, MoO2, and SnO2 oxides (XPS analysis). This alloy revealed nobler electrochemical behavior, more favorable values of the corrosion parameters and open circuit potentials in simulated body fluid in comparison with commercially pure titanium (CP-Ti) and Ti-6Al-4V alloy taken as reference biomaterials in this study...
October 4, 2016: Materials
https://www.readbyqxmd.com/read/28773908/characteristics-of-ceramic-fiber-modified-asphalt-mortar
#13
Jiuming Wan, Shaopeng Wu, Yue Xiao, Quantao Liu, Erik Schlangen
Ceramic fiber, with a major composition of Al₂O₃ and SiO₂, has advantages of stability at relatively high temperature, big specific surface area and resistance to external mechanical vibration. It has the potential contribution of improving the rutting resistance and temperature sensitivity of modified asphalt binder by proper modification design. In this research, ceramic fiber was introduced into both pen 60/80 and pen 80/100 asphalt binder by different weight ratios. An asphalt penetration test, softening point test, ductility test and dynamic viscoelastic behavior were conducted to characterize and predict the ceramic fiber modified asphalt mortar (CFAM)...
September 21, 2016: Materials
https://www.readbyqxmd.com/read/28773802/doping-effect-of-graphene-nanoplatelets-on-electrical-insulation-properties-of-polyethylene-from-macroscopic-to-molecular-scale
#14
Ziang Jing, Changming Li, Hong Zhao, Guiling Zhang, Baozhong Han
The doping effect of graphene nanoplatelets (GNPs) on electrical insulation properties of polyethylene (PE) was studied by combining experimental and theoretical methods. The electric conduction properties and trap characteristics were tested for pure PE and PE/GNPs composites by using a direct measurement method and a thermal stimulated current (TSC) method. It was found that doping smaller GNPs is more beneficial to decrease the conductivity of PE/GNPs. The PE/GNPs composite with smaller size GNPs mainly introduces deep energy traps, while with increasing GNPs size, besides deep energy traps, shallow energy traps are also introduced...
August 10, 2016: Materials
https://www.readbyqxmd.com/read/28772796/mechanics-of-pickering-drops-probed-by-electric-field-induced-stress
#15
Alexander Mikkelsen, Paul Dommersnes, Zbigniew Rozynek, Azarmidokht Gholamipour-Shirazi, Marcio da Silveira Carvalho, Jon Otto Fossum
Fluid drops coated with particles, so-called Pickering drops, play an important role in emulsion and capsule applications. In this context, knowledge of mechanical properties and stability of Pickering drops are essential. Here we prepare Pickering drops via electric field-driven self-assembly. We use direct current (DC) electric fields to induce mechanical stress on these drops, as a possible alternative to the use of, for example, fluid flow fields. Drop deformation is monitored as a function of the applied electric field strength...
April 21, 2017: Materials
https://www.readbyqxmd.com/read/28772685/enhanced-unipolar-resistive-switching-characteristics-of-hf0-5zr0-5o2-thin-films-with-high-on-off-ratio
#16
Zhipeng Wu, Jun Zhu
A metal-insulator-metal structure resistive switching device based on H0.5Z0.5O₂ (HZO) thin film deposited by pulse laser deposition (PLD) has been investigated for resistive random access memory (RRAM) applications. The devices demonstrated bistable and reproducible unipolar resistive switching (RS) behaviors with an extremely high OFF/ON ratio over 5400. The retention property had no degradation at 6 × 10⁴ s. The current-voltage characteristics of the HZO samples showed a Schottky emission conduction in the high voltage region (Vreset < V < Vset), while at the low voltage region (V < Vreset), the ohmic contact and space charge limited conduction (SCLC) are suggested to be responsible for the low and high resistance states, respectively...
March 22, 2017: Materials
https://www.readbyqxmd.com/read/28772448/experimental-study-on-influence-of-trap-parameters-on-dielectric-characteristics-of-nano-modified-insulation-pressboard
#17
Qingguo Chen, Heqian Liu, Minghe Chi, Yonghong Wang, Xinlao Wei
In order to study the influence of trap parameters on dielectric characteristics of nano-modified pressboards, pressboards were made using the nano doping method with different nanoparticle components. The dielectric characteristics of the modified pressboards were measured, and the trap parameters were investigated using the thermally stimulated current (TSC) method. The test results indicated that the conductivity initially declined and then rose with the increase of nano-Al₂O₃ content, whereas it solely rose with the increase of nano-SiC content...
January 22, 2017: Materials
https://www.readbyqxmd.com/read/28754588/substance-p-preserves-pancreatic-%C3%AE-cells-in-streptozotocin-induced-type-1-diabetic-mice
#18
Nunggum Jung, Jihyun Um, Do Yeon Kim, Maria Jose Dubon, Yeji Byeon, Dongjin Kim, Youngsook Son, Ki-Sook Park
Preservation of the pancreatic β-cell population is required for the development of therapies for diabetes, which is caused by a decrease in β-cells. Here, we demonstrate the antidiabetic effects of substance P (SP) in type 1 diabetes (T1D) mice induced with streptozotocin. SP enhanced the compensatory proliferation of β-cells in order to restore β-cells in response to acute injury induced by a single high-dose of streptozotocin. However, SP affected neither the basal proliferation of β-cells nor their apoptosis...
July 25, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28753347/understanding-the-giant-enhancement-of-exchange-interaction-in-bi_-2-se_-3-eus-heterostructures
#19
Jeongwoo Kim, Kyoung-Whan Kim, Hui Wang, Jairo Sinova, Ruqian Wu
A recent experiment indicated that a ferromagnetic EuS film in contact with a topological insulator Bi_{2}Se_{3} might show a largely enhanced Curie temperature and perpendicular magnetic anisotropy [F. Katmis et al., Nature (London) 533, 513 (2016).NATUAS0028-083610.1038/nature17635]. Through systematic density functional calculations, we demonstrate that in addition to the factor that Bi_{2}Se_{3} has a strong spin orbit coupling, the topological surface states are crucial to make these unusual behaviors robust as they hybridize with EuS states and extend rather far into the magnetic layers...
July 14, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28753323/two-dimensional-j_-eff-1-2-antiferromagnetic-insulator-unraveled-from-interlayer-exchange-coupling-in-artificial-perovskite-iridate-superlattices
#20
Lin Hao, D Meyers, Clayton Frederick, Gilberto Fabbris, Junyi Yang, Nathan Traynor, Lukas Horak, Dominik Kriegner, Yongseong Choi, Jong-Woo Kim, Daniel Haskel, Phil J Ryan, M P M Dean, Jian Liu
We report an experimental investigation of the two-dimensional J_{eff}=1/2 antiferromagnetic Mott insulator by varying the interlayer exchange coupling in [(SrIrO_{3})_{1}, (SrTiO_{3})_{m}] (m=1, 2 and 3) superlattices. Although all samples exhibited an insulating ground state with long-range magnetic order, temperature-dependent resistivity measurements showed a stronger insulating behavior in the m=2 and m=3 samples than the m=1 sample which displayed a clear kink at the magnetic transition. This difference indicates that the blocking effect of the excessive SrTiO_{3} layer enhances the effective electron-electron correlation and strengthens the Mott phase...
July 14, 2017: Physical Review Letters
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