Abstract High performance thermal insulation materials are desired for a wide range of applications in space, buildings, energy, and environments. Here, facile ambient processing approach is reported to synthesize highly insulating flexible monolithic poly(vinyl chloride) aerogel. The conductivity measured respectively as 28 mW (m K) −1 at atmosphere approaching the air 7.7 under mild evacuation condition. Thermal modeling performed understand contributions from different heat transport...

Abstract To expand the use of metal–organic frameworks (MOFs) based self-lubricating composite, flexible MOFs MIL-88D has been studied as a nanocontainer for loading lubricant. In this work, mechanism oleamine adsorption and desorption by was investigated through molecular simulations experiments. Molecular showed that oleamines can be physically adsorbed into open MIL-88Ds with Fe O atoms interacting NH 2 -group. Higher temperature cause Ole@MIL-88D to release more oleamines, while higher...

In this paper, we develop an end-to-end modeling framework to explore how various multiscale phenomena in solar cells translate from materials module level. Specifically, the model captures physics related 1) pressure-dependent grain growth of polycrystalline thin films (nanometers micrometers), 2) averaging effects grain-size distribution at centimeter scale, and 3) parasitic series shunt resistance distributions on efficiency thin-film cell modules (centimeter meter scale). As idealized...

Pb ( Zr 0.52 Ti 0.48 ) 0.96 Nb 0.04 O 3 (PZTN) thin films were deposited on BaPbO3 (BPO) electrodes by rf-magnetron sputtering. 34, 68, 135, and 270 nm thick BPOs adopted in this study. The preferred orientation changes from slightly (100)/(001) to (101)/(110) as the BPO thickness increased. mean grain sizes obtained Williamson–Hall plots are 81 nm, 120 146 90 respectively. same tendency was observed atomic force microscopy method. In residual stress analysis, tensile every film. magnitude...

Abstract To utilize Cu-benzene-1,3,5-tricarboxylate (Cu-BTC) adsorbed lubricant oils in the self-lubricating field, adsorption properties of Cu-BTC on different 1-olefins must be clarified. In this work, 1-hexene, 1-octene, 1-nonene, 1-decene, 1-undecene, and 1-dodecene were studied by Monte Carlo method experimentally. The limit for n-olefins was determined as 1-undecene isotherms. This suggested a even straight-chain molecules to Cu-BTC. maximum ratio olefin length largest pore diameter (...

Remarkable room temperature ferromagnetism in pure single-crystal rutile TiO2 (001) samples irradiated by D—D neutron has been investigated. By combining X-ray diffraction and positron annihilation lifetime, the contracted lattice clearly identified TiO2, where Ti4+ ions can be easily reduced to state of Ti3+. As there were no magnetic impurities that could contaminate during whole procedure, some Ti3+ reside on interstitial or substituted sites accompanied oxygen vacancies should...

Room-temperature photoluminescence and optical transmittance spectroscopy of Co-doped (1 × 1014, 5 1016, 1 1017 cm−2) Cu-doped (5 1016 ZnO wafers irradiated by D—D neutrons (fluence 2.9 1010 have been investigated. After irradiation, the Co or Cu metal oxide clusters in doped are dissolved, würtzite structure substrate for each sample remains unchanged keeps high c-axis preferential orientation. The degree irradiation-induced crystal disorder reflected from absorption band tail parameter...

Ba0.8Sr0.2TiO3/CoFe2O4(BST/CFO) magnetoelectric composite thin films of 2-2-type structures are prepared onto Pt/Ti/SiO2/Si substrates by a sol-gel process and spin coating technique. The structure the film is substrate/BST/CFO/.../CFO/BST. Three CFO ferromagnetic layers separated from each other BST layer. upper layer magnetostatically coupled with lower Subsequent scanning electron microscopy investigations show that exhibit good morphologies have compact structure, cross-sectional...

We have investigated the preparation and properties of Bi4Zr0.5Ti2.5O12 thin films on LaNiO3 bottom electrode. The were fabricated electrode using sol–gel method. structure morphology characterized x-ray diffraction scanning electron microscopy. results show that are a perovskite phase with dense microstructure. 2Pr 2Vc Pt/BZT/LaNiO3 capacitor 28.2 µC cm−2 14.7 V respectively under applied voltage 25 V. After switching 1 × 1010 cycles, Pr value decreases to 87% its pre-fatigue values....

Praseodymium doped Bi 4 Ti 3 O 12 (BTO) thin films with composition 3.63 Pr 0.3 (BPT) were successfully prepared on Pt/Ti/SiO 2 /Si substrates by RF‐magnetron sputtering method at substrate temperatures ranging between 500° and 750°C. The structural phase orientation of the deposited investigated in order to understand effect deposition temperature properties BPT films. As was increased 700°C, started showing a tendency assuming c ‐axis preferred orientation. At lower temperatures, however,...

Bi3.25La0.75 Ti3O12 (BLT) ferroelectric thin films are deposited by sol-gel method and annealed for crystallizaion in total 1sccm N2/O2 mixed gas with various ratio at 750°C 30 min. The effect of crystallization ambient on the structural properties BLT is studied. growth direction grain size film revealed to affect properties. After 20% O2, largest Pr value obtained, which ascribed an increase random orientation large size. fatigue property improved concentration oxygen increasing, annealing...

We propose a conceptional thermal printhead with dual microbubble generators mounted parallel in each nozzle chamber, where multiwalled carbon nanotubes are adopted as heating elements much higher energy efficiency than traditional approaches using noble metals or polysilicon. Tailing effect of droplet can be excluded by appropriate control grouped bubble generations. Characteristics the corresponding micro-fabricated were comprehensively studied before formation printhead. Electrical...

The Pb(Zr 0.52 Ti 0.48 )O 3 ferroelectric films with a c -axis oriented Bi 4 O 12 buffer layer were deposited on p-Si(100) substrate by pulsed laser deposition (PLD) technique. found to grow preferred orientation along (110) direction. Good properties obtained for 400 nm thick /Bi film system Au electrodes: P r and E 20 µC/cm 2 48 kV/cm respectively. memory window of capacitance–voltage ( C – V ) charactristics enlarged obviously the current density reduced nearly two orders magnitude after...

A full 3D transient model of direct chill casting is developed to predict the thermal stress during startup phase for AA5182. Simulations show that tensile starts develop at ingot surface and gradually migrates center. By varying position wiper below mold, maximum residual in center reduced by up 35% compared without use a wiper. The closer inserted larger reduction effect, but greater risk remelting surfaces In order prevent this, forced-convection air cooling recommended on current study...

ABSTRACT Bi3.25La0.75Ti3O12 films are prepared on Pt/Ti/SiO2/Si substrate by Sol-Gel method. The XRD patterns indicate that the BLT annealed at different temperatures randomly orientated and single perovskite phase is obtained 550°C annealed. ferroelectric properties leakage current characteristics studied. remnant polarization increases coercive field decreases with annealing temperature increasing. density of 700°C about 5.8 × 10−8 A/cm2 250 kV/cm. There unambiguously differentiated...

Ferroelectric Bi2.9Pr0.9Ti3O12/La0.67Sr0.33MnO3 (BPT/LSMO) films are fabricated on Pt(111)/TiO2/SiO2/Si substrates by rf-magnetron sputtering method. The influences of the LSMO deposition conditions and layer thickness properties BPT thin studied. deposited at 300° C 450σ favours preferred (117) orientation films, while 600° for leads to strong (111)-preferred film. With buffer layer, exhibit improved ferroelectric Pt/BPT/LSMO(20nm)/Pt capacitor shows largest remnant polarization Pr 18.4...

Grain morphology has been long considered to be a major factor in the performance and efficiency of photovoltaic devices. Experimental work demonstrated effect average grain size surface roughness on control conversion efficiency. But its statistics kinetics are not well understood. While much theoretical progress made for α-Si by various effective media Monte Carlo models, theory polycrystalline material growth remains primitive. In this paper, generalized 2D model was developed predict...

Metal–ferroelectric–semiconductor field-effect-transistors (MFS-FETs) with the Ag/Bi 4 Ti 3 O 12 /p-Si (100) structures were fabricated. The I ds – V g hysteresis curve of FET shows counter-clockwise direction, which demonstrates charge channel conductivity due to ferroelectric polarization Bi and memory window a gate voltage ±6 was 1.2 V. current ratio ds(on) ds(off) over two orders in magnitude at zero indicates MFS-FET can be used nondestructive readout (NDRO) applications.