Materials Literature
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A new type of hydrogen sulfide (H2S) sensor based on a (chemical) phase transformation in copper oxide (CuO; p-type semiconductor) is presented. Layers of electrospun copper oxide fibers show dosimeter-type behavior if exposed to highly diluted H2S at operating temperature of 170 °C. The conductance of these layers re…
We fabricated and characterized the performance and stability of metal indium oxide (XIO, X = Zn, Ga, and Al) thin film transistors (TFTs) by an aqueous route with 350°C annealing. The optimized XIO TFTs exhibited good electrical performance. The bias stability of the optimized oxide TFTs was evaluated and we conclude…
We present computer simulations of the response of a flexoelectric blue phase network, either in bulk or under confinement, to an applied field. We find a transition in the bulk between the blue phase I disclination network and a parallel array of disclinations along the direction of the applied field. Upon switching…
The enhanced oil recovery (EOR) results of foam flooding depend largely on the stability of foam flow within reservoirs in the presence of crude oil. Experimental studies indicated that oil would impact the foam stability greatly. This paper discussed the effect of oil on the stability of polymer enhanced foams. Two c…
Spectrally-encoded endoscopy (SEE) is an ultraminiature endoscopy technology that acquires high-definition images of internal organs through a sub-mm endoscopic probe. In SEE, a grating at the tip of the imaging optics diffracts the broadband light into multiple beams, where each beam with a distinctive wavelength is…
Low-energy electron induced degradation of a model self-assembled monolayer (SAM) of acid terminated alkanethiol was studied under ultra-high vacuum (UHV) conditions at room and low (~40 K) temperatures. Low-energy electron induced chemical modifications of 11-mercaptoundecanoic acid (MUA, HS-(CH2)10-COOH) SAMs deposi…
We synthesized monochelic porphyrinic polystyrene (MPPS) and investigated its self-assembly with PEGylated fullerene (F-PEO) and pristine fullerene (C60), separately. Continuous fibrils and spherical aggregates were observed on complexation of MPPS with F-PEO and pristine C60 respectively.
Although theoretical works have demonstrated that (0001) polar films of wurtzite (WZ) ZnO automatically transform into graphitic-like (GP) structures, the experimental realization of GP ZnO is limited to a thickness of several atomic layers. Here, using first-principles calculations, we demonstrated that the stability…
Compósitos de resina Poliuretana (PU) derivada de óleo de mamona e partículas de bambu (Dendrocalamus giganteus) foram preparados com 10, 15 e 20% em peso de PU pelo processo de prensagem. O objetivo do presente estudo foi criar uma solução para aproveitar resíduos da manufatura do bambu, minimizando impactos negativo…
Crown containing calix [4]arenes 2a-f with thioacetate-functionalized carbon chains on lower rim in 1,3-alternate conformation were synthesized starting from corresponding bromo-derivatives.The use of thiacalixcrowns monolayer films improves adhesion between gold and biomolecules (cytochrome c and catalase).The struct…
The extent of water sorption in a thin film of a typical glassy polymer, poly(methyl methacrylate) (PMMA), was studied by neutron reflectivity. Interestingly, the as-spun film could uptake water to 16.3 vol%, much more than the reported value of a few vol% for bulk PMMA. This can be explained in terms of the heterogen…
Simulations of microphase separation are carried out using the dissipative particle dynamics (DPD). By varying the concentration and temperature of resin solutions we explore mesomorphologies supported by the all-atom models. We found that for a low degree of functionalization the homogeneously distributed ionomers se…
We present a detailed study on aluminum-boron doping profiles formed in silicon by alloying from screen-printed aluminum pastes containing boron additives. We show that an increase in the effective peak temperature Tpeak,eff (determined from phase diagram calculations) of the alloying process leads to higher concentra…
In this work, we report our effort to understand the photocurrent generation that is contributed via electron-exciton interaction at the donor/acceptor interface in organic solar cells (OSCs). Donor/acceptor bi-layer heterojunction OSCs, of the indium tin oxide/copper phthalocyanine (CuPc)/fullerene (C60)/molybdenum o…
A cosolvent-free sol–gel method to synthesize monolithic silica glasses containing both of rare-earth and aluminum ions has been studied. Fracture during drying and bloating during sintering are significantly suppressed by forming macroporous wet gels via macroscopic phase separation in parallel with gelation. The res…
The corrosion characteristics of reduced activation ferritic martensitic steels, JLF-1 (Fe-9Cr-1.94W-0.09C) and 9Cr-ODS (Fe-9Cr-1.97W-0.14C-0.29Y-0.23Ti), and unalloyed metals of Cr, W and Mo in liquid Pb-17Li were investigated by means of static corrosion tests at 600◦C for 500 hours. The corrosion of the JLF-1 steel…
In this paper, we propose an adaptive finite element method for simulating the moving contact line problems in three dimensions. The model that we used is the coupled Cahn-Hilliard Navier-Stokes equations with the generalized Navier boundary condition(GNBC) proposed in [18]. In our algorithm, to improve the efficiency…
The mesoporous SiO2–(L)-lysine hybrid nanodisks have been synthesized via hydrolyte polycondensation of tetraethylortho-silicate in the presence of cetyltri-methylammonium bromide and (L)-lysine. The prepared hybrid nanodisks have a high surface area (570 m2 g−1) and ordered mesopores with the size of about 2.9 nm. Du…
CeO2-based redox nanomaterials are widely used in automotive catalysts, solid oxide fuel cell systems and many other applications as highly efficient redox systems. However, these properties suffer thermal deactivation under real operating conditions and accordingly thermal stability is a highly desirable property. We…
AIM: This study aims to investigate the possible role of H. pylori as a cause of laryngeal squamous cell carcinoma. METHOD: This controlled study was performed with 31 consecutive laryngeal cancer and 28 cancer-free patients who underwent direct laryngoscopy and biopsy of laryngeal lesions. To document the previous H.…