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oe1(光电查) - 科学论文

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出版时间
  • 2018
研究主题
  • sodium lighting system
  • modeling
  • radiation curves
  • LED lighting system
  • software goniophotometer
  • upper half-space
应用领域
  • Electrical Engineering and Automation
机构单位
  • VSB-TU Ostrava
91 条数据
?? 中文（中国） ▾

  • Inhibition of Autophagy with Chloroquine Enhanced Sinoporphyrin Sodium Mediated Photodynamic Therapy-induced Apoptosis in Human Colorectal Cancer Cells

    摘要： To evaluate the antitumor effect of sinoporphyrin sodium mediated photodynamic therapy (DVDMS-PDT) against human colorectal cancer (CRC) and to investigate the role of autophagy in its effect. Shrunken cells, condensed nuclei and increased levels of cleaved caspase-3 and Bax were observed in DVDMS-PDT treated HCT116 cells, reminiscent of apoptosis. DVDMS-PDT showed better antitumor efficiency in HCT116 cells than Photofrin mediated photodynamic therapy (PF-PDT) both in vitro and in vivo. And DVDMS-PDT caused autophagic characteristics: double membrane autophagosome structures and changes in autophagy-related protein expression (ATG7, P62, Bcl-2 and LC3-Ⅱ). In addition, inhibition of autophagy by chloroquine (CQ) promoted apoptosis, suggesting a possible protective role of autophagy in DVDMS-PDT-treated HCT116 cells, which was proved by flow cytometry and western blotting. The results of xenograft mouse model showed markedly increased apoptosis and significantly reduced tumor size in DVDMS-PDT treated group than Control, and DVDMS-PDT exhibited better antitumor efficiency than PF-PDT. Further, no visible tumor was observed in the CQ+DVDMS-PDT group at the end of the xenograft mouse experiment, which confirmed the hypothesis that autophagy was protective to DVDMS-PDT treated HCT116 cells. Our findings suggest that DVDMS is a promising photosensitizer and the combined use of autophagy inhibitor can remarkably enhance the DVDMS-PDT mediated anti-cancer efficiency in HCT116 cells both in vitro and in vivo.

    关键词： autophagy,apoptosis,photodynamic therapy,chloroquine,sinoporphyrin sodium,colorectal cancer

    更新于2025-09-19 17:15:36

  • Structures of silicate glasses with varying sodium and fixed iron contents

    摘要： Silicate glasses have been synthesised with a fixed 8 mol% of Fe3O4 and sodium oxide varying from 12 mol% to 20 mol%. The environment of the Fe ion was examined by Extended X-ray Absorption Fine structure and M?ssbauer spectroscopy which have shown tetrahedral coordination of oxygen around Fe regardless of the oxidation state of iron. M?ssbauer data indicate increasing; distortion of these tetrahedral units and Fe3+ to Fe2+ ratios, with increasing sodium concentration. Raman spectroscopic studies have shown the presence of Qn linkages for n = 0 to n = 4. For the sodium silicate glass without iron, the single most common linkage is Q3 (~ 50%) suggesting the role of the alkali to be disruptive to the continuity of the silica random network. For the iron containing glasses, the main linkage is Q2 (~ 65%). However, in the latter glasses the fraction of Q3 linkages although considerably less (~10% to ~20%) than Q2 is shown to increase with alkali content due to the concomitant rise of Fe3+ ions which are known to be network formers.

    关键词： Structure,Silicate,Iron,Glass,Sodium

    更新于2025-09-19 17:15:36

  • Outstanding Piezoelectric Performance in Lead-Free 0.95(K,Na)(Sb,Nb)O <sub/>3</sub> -0.05(Bi,Na,K)ZrO <sub/>3</sub> Thick Films with Oriented Nanophase Coexistence

    摘要： Lead-free 0.95(K0.48Na0.52)(Nb0.95Sb0.05)O3-0.05Bi0.5(Na0.82K0.18)0.5ZrO3 (KNSN-BNKZ0.05) piezoelectric films with preferred crystal orientation and enhanced thickness are fabricated on silicon substrates from a chemical solution approach. Adequate K excess is introduced to obtain a single perovskite phase in the resulting thicker films. The effects of thickness, crystal orientation, and structure of the films on the performance are investigated. Outstandingly large effective piezoelectric strain coefficient up to 250 pm V?1 is demonstrated over a macroscopic scale using a laser scanning vibrometer in the [100]-KNSN-BNKZ0.05 film with an enhanced thickness of 2.7 μm, competitive to the benchmark oriented lead zirconate titanate films on silicon. Atomically resolved electron microscopy reveals the coexistence of oriented ferroelectric rhombohedral (R) and tetragonal (T) phases at the nanometer scale with gradual polarization rotation, which can lower the domain wall energy and facilitate the large piezoelectric response. The increased film thickness reduces the in-plane mechanical clamping to enable more free deformation in the thickness direction and improve domain wall mobility, both further contributing to enhanced piezoelectric response.

    关键词： orientation,sodium potassium niobate,piezoelectric films,phase coexistence,lead-free electronics

    更新于2025-09-19 17:15:36

  • Evaluation of photocatalytic thin film pretreatment on anaerobic degradability of exopolymer extracted biosolids for biofuel generation

    摘要： This study reports the result of sodium citrate induced exopolymer extraction on the photocatalytic thin film (TiO2) pretreatment efficiency of waste activated sludge (WAS). TiO2 is immobilized through DC spluttering method followed by annealing process. The exopolymer removal of 94.2 % by sodium citrate (0.05 g/g SS) promotes better disintegration. This TiO2 thin film efficiently extricate the intracellular components of exopolymer extracted sludge at 50 minutes increasing the solubilization to 19.33 %. As a result, the exopolymer extracted sludge shows high methane generation (0.24 gCOD/gCOD) than the other (pretreated sludge without exopolymer removal – 0.12 gCOD/gCOD and raw sludge without treatment – 0.075 gCOD/gCOD). The methane generated in sodium citrate induced TiO2 thin film pretreated sludge is 398.99 kWh. In cost analysis, it gives net cost of -57.46 USD/ ton of sludge. In addition, the proposed method also accounts 51.3 % of solid reduction.

    关键词： Methane,Photocatalytic oxidation,Sodium citrate,Pretreatment,Cost analysis

    更新于2025-09-19 17:15:36

  • Preparing CdS QDs in sodium alginate gel: realizing water-solubility and stimuli-responsiveness of QDs in an integrative way

    摘要： Quantum dots (QDs) were of great interest due to the excellent fluorescence property and have been widely studied. Comparing with the typical organometallic synthetic routes and hydrothermal method that were usually carried out under high temperature, colloidal template could be used for preparing QDs in mild conditions and have gained increasing attention. In this prospect, hydrogel was an ideal colloidal template for preparation of QDs in aqueous medium while the related study for in-situ preparation of QDs in gel and the consequent functionalization of QDs was in demand. In this paper, we proposed a two-step method to prepare CdS QDs in sodium alginate (SA) gel which showed effective constraint in uniform size distribution of QDs. Without extra ligands introduction, the prepared CdS-SA QDs showed responsiveness to pH and detectability to Fe3+ which provide a simplified way for functionalization of QDs. The CdS-SA QDs showed good biocompatibility and stability in a certain concentration which indicated the application prospect of the CdS-SA QDs in fields of biological labeling and environmental sensor.

    关键词： gel,stimuli responsiveness,pH,Sodium alginate,CdS QDs

    更新于2025-09-19 17:15:36

  • Direct bandgap opening in sodium-doped antimonene quantum dots: an emerging 2D semiconductor

    摘要： Antimonene, which is similar to two-dimensional (2D) phosphorene, has recently gained considerable attention because of its thickness-dependent energy band structure. However, unlike phosphorene, undoped antimonene has an indirect bandgap only at the monolayer limit. In this work, an electrochemical sodium doping strategy was proposed to tune the energy band structure of antimonene. First-principles calculations indicated that a direct bandgap of 0.88 eV formed in 5.55% Na-doped antimonene, while undoped antimonene had an indirect bandgap of 2.38 eV. Optical and electrical measurements provided clear evidence for such a reconstruction of the energy band. We experimentally demonstrated p-type conduction in antimonene quantum dots (QDs)-based field-effect transistors. Furthermore, the induced direct bandgap enabled electric-field control of the surface-enhanced Raman scattering on plasmonic-free antimonene QDs. This allowed for detection of Rhodamine 6G with a detection limit down to the sub-femtomolar level. Our study highlights the potential of doped antimonene as an emerging 2D semiconductor.

    关键词： Direct Bandgap,Quantum Dots,Antimonene,Field-Effect Transistors,Surface-Enhanced Raman Scattering,Sodium Doping

    更新于2025-09-19 17:13:59

  • Size-controlled MoS<sub>2 </sub>nanosheet through ball milling exfoliation: parameter optimization, structural characterization and electrocatalytic application

    摘要： Unique properties and potential applications of 2D materials draw much attention for mass production of thin-layer 2D materials. Ball milling exfoliation of 2D materials has been rarely used, in spite of a promising dry phase production method, because of the superficial information in the mechanism and the effect of the operating parameters on the yield, size and thickness. Here, we investigate systematically the ball milling operating parameters in the exfoliation of bulk MoS2 in the presence of sodium cholate (SC) as an exfoliant. The yield and dimensions of the exfoliated MoS2 nanosheet were monitored by changing the parameters such as the weight ratio of bulk MoS2 and SC (SC/MoS2), the filling ratio in the volume of milling ball and container (!), milling ball size (dB), milling revolution speed (nR), and initial mass of bulk MoS2 (mMoS2). The yield of exfoliation is found to be 95% at the optimum ball milling conditions (SC/MoS2 = 0.75, ! = 50%, mMoS2 = 0.20 g). In addition, yield and size of the exfoliated MoS2 were controlled by the conditions of the ball milling. As for the evaluation of size and thickness of the ball-milled MoS2 powder with less than 30% difference from those determined by the well-known absorption method. Finally, the size and thickness of the MoS2 nanosheets prepared by ball milling exfoliation were correlated with their electrocatalytic and photoelectrocatalytic activities.

    关键词： electrocatalyst,sodium cholate,nanosheet,exfoliation,Ball milling,molybdenum disulfide,XRD

    更新于2025-09-19 17:13:59

  • Electrochemical growth and characterization of Cu2O:Na/ZnO heterojunctions for solar cells applications

    摘要： Cu2O:Na/ZnO/FTO heterojunctions were successfully prepared by a simple two-step electrodeposition method. The effects of the doping concentration of Na on the electronic, morphological, microstructural, optical and electrical properties of the nanostructures were investigated. The deposition was carried out at various concentrations of Na ions and constant bath temperature (70 C°). Cyclic voltammetry was utilized for the determination of the selective potential for electrodeposition of pure Cu2O. Mott-Schottky electrochemical impedance analysis showed p-type conductivity for the Cu2O layers and n-type conductivity for the ZnO films. X-ray diffraction analysis indicated that all doped and undoped Cu2O nanostructures have a polycrystalline nature with a highly cubic Cu2O (111) oriented crystallites and a hexagonal wurtzite structure of ZnO having (002) preferential orientations. Scanning electron microscopy and atomic force microscopy measurements point out the decrease of the grain size and the roughness of Cu2O:Nax/ZnO heterojunctions with the formation of typical (111) textured feature, through the contribution of Na doping. From UV-Vis spectra, a red-shift of the bandgap from 2.223 to 2.008 eV with an increase in the optical conductivity range up to 9 x 1014 cm-1 was noted by increasing the Na content. The current-voltage characteristics of p-Cu2O:Na/n-ZnO heterojunctions showed excellent rectifying behavior, achieving a high rectifying ratio of 3133%. Na doping has been demonstrated by a huge drop in the series resistance of Cu2O/ZnO heterojunctions besides a great improvement in both of the ideality factor and the threshold voltages as well as photoelectric responses. The highlighted results are attractive and suitable for photovoltaic applications.

    关键词： Cu2O/ZnO heterojunctions,metal-oxide,I-V,electrodeposition,sodium doping

    更新于2025-09-19 17:13:59

  • SERS detection of sodium thiocyanate and benzoic acid preservatives in liquid milk using cysteamine functionalized core-shelled nanoparticles

    摘要： A cysteamine functionalized core shelled nanoparticles (Au@Ag-CysNPs) was presented for simultaneous and rapid detection of sodium thiocyanate (STC) and benzoic acid (BA) preservatives in liquid milk using surface-enhanced Raman spectroscopy (SERS) technique. A spectrum covering 350-2350 cm-1 region was selected to detect STC with concentrations ranging from 0.5 to 10 mg/L and BA with concentrations ranging from 15 to 240 mg/L in milk samples. Characterization of nanoparticles using high-resolution TEM confirmed that the successful synthesis of Au@AgNPs with core (gold) size of 28 nm and shell (silver) thickness of about 5 nm was grafted with 120 μL of 0.1 nM cysteamine hydrochloride. Results showed that Au@Ag-CysNPs could be used to detect STC up to 0.03 mg/L with a limit of quantification (LOQ) of 0.039 mg/L and a coefficient of determination (R2) of 0.9833 in the milk sample. For detecting BA, it could be screened up to 9.8 mg/L with LOQ of 10.2 mg/L and R2 of 0.9903. The proposed substrate was also highly sensitive and the employed method involved only minor sample pretreatment steps. It is thus hoped that the new substrate could be used in the screening of prohibited chemicals in complex food matrices in future studies.

    关键词： SERS,milk adulteration,sodium thiocyanate,nanoparticles,benzoic acid

    更新于2025-09-16 10:30:52

  • AIP Conference Proceedings [AIP Publishing TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr - Athens, Greece (4–6 September 2019)] TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES19Gr - Time effect on the red shift of surface plasmonic resonance core-shell SiO2: Gold nanoparticles (AuNPs)

    摘要： Spherical gold nanoparticles (AuNPs) chemically synthesized by Turkevich method, it coated with sodium silicate stock solution (Na2SiO3). Study different rate effect (SiO2 and ethanol) on position of surface plasmon resonance (SPR) of gold nanoparticles (AuNPs) after coated by using UV–Vis absorption spectroscopy. UV–vis spectrum showed that rate (SiO2 and ethanol) had effect in the coated gold nanoparticles (AuNPs), that Peak band gold nanoparticles (AuNPs) uncoated at (515nm) and this peak was shifted to longer wavelength (518nm) after coating. Coated after get a little shift in position of surface plasmon resonance (SPR) this means that coated method has an important role in maintain on gold nanoparticles (AuNPs) stability.

    关键词： gold nanoparticles (AuNPs),Surface Plasmon Resonance (SPR),Sodium Silicate (Na2SiO3),Turkevich method

    更新于2025-09-16 10:30:52