Materials Literature
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Four chitosan samples were prepared from shrimp shells without deproteination and decoloration steps, by a deacetylation process at 2 reaction times (2 and 4 h) and with/without using a reducing agent (R.A.). Variations in the physicochemical properties of the final products were analyzed. Viscosity average molecular…
We report a high-performance colloidal quantum dot (CQD)-based near-infrared tandem photodetector fabricated on flexible substrates via solution-processed method. The tandem photodetector on poly(ethylene terephthalate) substrates exhibited low dark current and high detectivities over ∼8.8 × 1011 Jones at near infrare…
We extend concepts from microwave engineering to thermal interfaces and explore the principles of impedance matching in 1D. The extension is based on the generalization of acoustic impedance to nonlinear dispersions using the contact broadening matrix Γ(ω), extracted from the phonon self energy. For a single junction,…
Mesoporous silicates (MPS) have several advantages for the immobilization of enzymes and large organic molecules. They possess well-defined pores and their surfaces can be functionalized by chemical methods. In this study, the model protein ribonuclease A (RNase A) was encapsulated in unmodified amino- and carboxy-fun…
Fish gelatin provides an alternative source of gelatin for Halal and Kosher applications and is prion and zoonotic agent free. However, applications of fish gelatin have been limited due to inferior mechanical and barrier properties. The physical properties of fish gelatins can be improved by crosslinking using natura…
The (110) surface of the InPd intermetallic compound and the In-Pd surface alloy properties are investigated in the framework of the density functional theory, within the projector augmented plane-wave method. Surface segregation is calculated to be energetically unfavorable at stoichiometric InPd(110) surfaces, while…
In situ transmission electron microscopy (TEM) was performed to observe the hydrogenation of Mg-Ni films in a hydrogen atmosphere of 80–100 Pa. An aberration-corrected environmental TEM with a differential pumping system allows us to reveal the Angstrom-scale structure of the films in the initial stage of hydrogenatio…
The influence of high magnetic fields on coherent transport is investigated. A monolayer graphene quantum ring is fabricated and the Aharonov-Bohm effect is observed. For increased magnitude of the magnetic field, higher harmonics appear. This phenomenon is attributed to an increase of the phase coherence length due t…
We report a theoretical investigation of the impact of asymmetry in the geometry of graphene nanoribbons (GNR) on the current-voltage characteristics caused by introducing the structural defects using ab initio methods. Only the most possible structural defects were considered: mono vacancy, Stone-Wales (SW) defect wi…
Silicon is a key technological material, and its controlled doping is one of the simple and effective ways which are applied for creation of new advanced materials with tunable optoelectronic properties. Boron was known to be a dopant that can dramatically change the properties of silicon. However, a limited solubilit…
Successful thermal management in nanostructured devices relies on control of interfacial thermal transport. Recent measurements have revealed poor thermal transport across interfaces between two dissimilar materials, e.g., organic semiconductors and metals. In such systems, the interfacial thermal conductance ${G}_{b}…
The hysteresis current-voltage (I-V) loops in Pt/BiFeO3/SrRuO3 structures are simulated using a Schottky diode-like conduction model with sigmoidally varying parameters, including series resistance correction and barrier lowering. The evolution of the system is represented by a vector in a 3D parameter space describin…
X-ray photoelectron spectroscopy (XPS) is widely used to probe properties such as molecular stoichiometry, microscopic distributions relative to the surface by so-called “depth-profiling”, and molecular orientation. Such studies usually rely on the core-level photoionization cross sections being independent of molecul…
A high-efficiency subwavelength diffractive beam combiner operating in a visible spectral range is designed, fabricated, and demonstrated. Such a device combines red, green, and blue color beams into one output light beam. Diffraction efficiencies of different types of gratings are calculated for various materials, in…
In this work, n-ZnO-nanowire/p-Si junction diodes have been fabricated and characterized both physically as well as electrically. The measurements are performed on a single standalone nanowire diode for the investigation of electrical transport through the nano-junction. The rectification properties of the single n-Zn…
In this paper, three different kinds of typical transition metal molybdates (AMoO4, A = Co, Ni, Cu) were synthesized via a hydrothermal method. X-ray diffraction and scanning electron microscopy (SEM) were used to characterize their structures. Then, the synthesized molybdates were incorporated into acrylonitrile-buta…
This study aimed to theoretical calculate the thermal residual stress in continuous SiC fiber reinforced titanium matrix composites. The analytical solution of residual stress field distribution was obtained by using coaxial cylinder model, and the numerical solution was obtained by using finite element model (FEM). B…
UV용 청색 형광체 <TEX>$CaMgSi_2O_6:Eu^{2+}$</TEX>를 환원 분위기 속에서 고상반응법(Solid-state reaction)으로 합성하였다. 합성된 형광체의 결정성을 확인하기 위해 X-선 회절(X-ray diffraction) 패턴 측정결과 C2/c(15)의 공간군과 단사정계(Monoclinic) 구조를 가지는 JCPDS No.75-1092와 일치하는 단일상임을 확인하였다. 광 여기 및 발광 스펙트럼을 통하여 350 nm 부근에서 최대 흡수치가 나타나며, 450 nm의 청색 발광을 보인다. 이는 <TEX>$Eu^{2+}$</TEX>이온의 <…
We apply first-principles methods to investigate the electronic properties of semiconductor carbon nanotubes deposited on hydrogen-terminated diamond surfaces. We found that the band gap of the diamond–nanotube system can be continuously varied (from 0 to 0.8 eV) through the application of an external electric field.…
Aluminum-doped zinc oxide (AZO) films were deposited on SiOC/Si wafer by an RF-magnetron sputtering system, by varying the deposition parameters of radio frequency power from 50 to 200 W. To assess the correlation of the optical properties between the substrate and AZO thin film, photoluminescence was measured, and th…