- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Silicon nanowire luminescent sensor for cardiovascular risk in saliva
摘要： Cardiovascular diseases are some of the today major cause of death in the world. C-reactive protein (CRP) is well known as the main biomarker related to cardiovascular risk and heart attack occurrence. The standard CRP analyses are performed in a hospital or in a biochemical laboratory with blood analysis after a long chemical and labelling preparation that require expert personnel. In this scenario, a health care analysis that can be performed by the same patient at his own home appears extremely revolutionary. In this paper, the study of an innovative sensing platform based on the luminescence at room temperature of silicon nanowires (NWs) is reported. This NWs sensor is label-free and does not require a chemical treatment of the analyte, is strongly selective to the CRP demonstrating a femtomolar limit of detection and a wide operating range. This proposed silicon sensing platform can be realized with an industrial compatible approach and permits to reveal the strategic CRP level in saliva in order to prevent a heart attack, with great advantages for the patient.
关键词： Cardiovascular risk,Saliva,C-reactive protein,Silicon nanowires,Luminescent sensor
更新于2025-11-21 11:01:37
-
Plasmon-enhanced upconversion luminescence in pyrochlore phase Yb<sub>x</sub>Er<sub>2-x</sub>Ti<sub>2</sub>O<sub>7</sub> thin film
摘要： Pyrochlore phase YbxEr2-xTi2O7 (YETO) thin films have been prepared by employing a facile sol-gel method combining with spin-coating technique and post-annealing treatment at 700 ℃. High concentration of Yb3+ ions can promote the transformation from Yb3+/Er3+ co-doped anatase phase TiO2 to pyrochlore phase YETO at 700 ℃ temperature. We find that the YETO thin film with 30 mol% Yb3+ ions exhibits the brightest upconversion (UC) emission. Moreover, introduction of Au nanorods (Au NRs) in the YETO thin film can further enhance the UC fluorescence. By adjusting the density of Au NRs, the UC emission intensity is increased by about 2.8-fold due to the excitation field enhancement caused by the localized surface plasmon resonance effect.
关键词： YbxEr2-xTi2O7,Thin film,Plasmon,Upconversion
更新于2025-11-21 11:01:37
-
Fabrication of nanometer-sized high-silica SAPO-5 and its enhanced photocatalytic performance for methyl orange degradation
摘要： Higher efficient degradation of methyl orange (MO) was demonstrated with nanometer-sized high-silica SAPO-5. By a hydrothermal process, synthesized high-silica SAPO-5 and low-silica SAPO-5 showed Si-to-Al ratios of 4.20 and 0.11, respectively. High-silica SAPO-5 showed much better MO degradation efficiency with a dosage of 70 mg in MO solution with a concentration of 10 mg/L under ultraviolet illumination. High-silica SAPO-5 also exhibited good producibility for preparation and stable photocatalytic activity even after the fifth recycling test. Optical characterizations of DRS, XPS, photocurrent density and time-resolved fluorescence were carried out for SAPO-5 samples. Finally, free radical and hole scavenging experiments were investigated for high-silica SAPO-5, and a MO photodegradation mechanism based on the charge transfer excited state of [Al2+–O?]* was proposed. This work highlights great prospects of high-silica SAPO-5 for organic pollutant removal with virtues of ideal efficiency and environmental friendliness.
关键词： Photocatalysis,High-silica,Nanometer-sized,SAPO-5
更新于2025-11-21 11:01:37
-
Raman Spectroscopy and Low Temperature Dielectric Properties of (Bi <sub/>0.5</sub> Na0. <sub/>5</sub> )TiO <sub/>3</sub> Ceramics
摘要： In the present study, lead-free Bi0.5Na0.5TiO3 (BNT) ceramics were prepared by solid state reaction route and the structural, microstructural and dielectric properties have been reported. The Rietveld refinement method and Raman spectroscopy were used to analyze the structural properties of BNT ceramics. The Rietveld refinement analysis of all the sintered samples revealed the rhombohedral crystal symmetry with R3c space group. The sintered (1100 oC) BNT ceramics exhibited homogeneous grain distribution with an average grain size of 1.40 μm. The dielectric properties of BNT ceramics were investigated over the frequency range of 1 MHz-100 MHz in the temperature range of 133K – 653K. The obtained values of dielectric constant (εr), dielectric loss (tanδ) and Curie temperature (TC) of the ceramics are 525, 0.067 and 603K respectively, as measured at 1 MHz. The temperature dependent AC-conductivity (ζac) of the BNT ceramics was analyzed using Arrhenius law and the activation energies (EA) were estimated in different regimes. The obtained EA values are in the range of 12.37 – 23.99 meV in the temperature regime 1 ( R1: 133K – 278K), whereas in regime 2 (R2: 320K – 603K) in the range 51.5 – 126.2 meV. The frequency (1 MHz – 100 MHz) dependent ζac measured at different temperatures was analyzed using Jonscher’s power law and super linear power law (SLPL). The obtained results indicate the BNT ceramics have potential applications in high frequency tunable devices.
更新于2025-11-21 11:01:37
-
Remarkable self-organization and unusual conductivity behavior in cellulose nanocrystal-PEDOT: PSS nanocomposites
摘要： Aqueous suspensions of cellulose nanocrystals were blended with Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) [PEDOT:PSS], and cast into thin films. The morphology, structure and electrical properties of the resulting nanocomposite thin films were thoroughly characterized. We found that the CNC–PEDOT:PSS blends self-organize into a layered vertical stack with a pitch of 100–200 nm while retaining a continuous percolation network for PEDOT. Atomic force microscopy, dynamic light scattering and multi-angle light scattering measurements confirmed the wrapping of polymer chains around the rod-like CNCs. The blended films exhibited improved molecular ordering of the PEDOT chains with concomitant improvement in the carrier mobility. The remarkable self-organization and enhanced structural order enabled the CNC–PEDOT:PSS blends to exhibit a high conductivity typical of PEDOT:PSS even when the content of the insulating CNCs in the nanocomposite was as high as 50 wt%.
更新于2025-11-21 11:01:37
-
A nano-complex system to overcome antagonistic photo-chemo combination cancer therapy
摘要： Photo-Chemo combination therapy has been intensively investigated for treatment of cancers, especially multidrug resistance cancer. However, antagonistic interactions between chemo-drugs and photosensitizers are frequently reported, and drugs doses and treatment sequences have been changed to overcome the problems. We observed the antagonistic effect by a decrease in singlet oxygen generation from the photosensitizer when Dox was in close physical proximity. To control the distance between Dox and the photosensitizer, we developed a novel pH-sensitive poly ionomer complex system composed of PEG-PLL(-g-Ce6) [Chlorin e6 grafted poly(ethylene glycol)-poly(L-lysine)] and PEG-PLL(-g-DMA)-PLA [2,3-dimethylmaleic anhydride grafted poly(ethylene glycol)-poly(L-lysine)-poly(lactic acid)] and evaluated this system with regard to singlet oxygen generation and antiproliferative activity against MCF-7/Dox cells. Enhanced singlet oxygen generation and antiproliferative activities were observed in vitro and in vivo for the poly ionomer complex system compared to PEG-PLL(-g-Ce6)-PLA/Dox due to the change in distance between Dox and Ce6 in the PIC system under acidic conditions. Our results highlight the importance of interactions between co-loaded drugs in combination therapy, and provide new insights into design principles for tailor-made nanomedicine platforms.
关键词： pH sensitive,chlorin e6,photo-chemo combination therapy,MDR,doxorubicin,synergism
更新于2025-11-21 11:01:37
-
g-C3N4 nanosheets functionalized silicon nanowires hybrid photocathode for efficient visible light induced photoelectrochemical water reduction
摘要： We report the fabrication of hybrid Si nanowires @ g-C3N4 nanosheets based photocathode using metal assisted chemical etching and facile liquid exfoliated process. The g-C3N4 nanosheets on Si nanowires form hybrid heterojunction photocathode, which exhibits an enhanced photon induced water reduction activity enabling higher photocurrent density of 22 mA cm?2 with applied bias photocurrent conversion efficiency of 4.3% under visible light irradiation. The onset potential of cathodic photocurrent is positively shifted from 41 to 420 mV vs. RHE with the short circuit current density, Jsc of 0.50 mA cm?2 owing to superior charge transport in hybrid photocathode as compared to pristine Si nanowires for hydrogen evolving reaction at pH～7. The electrochemical impedance spectroscopy measurement elucidates the interface layer of g-C3N4 nanosheets form hybrid heterojunction with Si nanowires that result significant increment in solar water reduction activity owing to low charge transferred resistance with high life time of excited electrons in conduction band. This strategy may open to design a new low cost stable hybrid heterostructure photocathode for solar induced water reduction.
关键词： Solar water reduction,Si nanowires,Photocathode,g-C3N4 nanosheets,Interface
更新于2025-11-21 11:01:37
-
Reusability and photocatalytic activity of bismuth-TiO2 nanocomposites for industrial wastewater treatment
摘要： In this study, bismuth-TiO2 nanotube (Bi-TNT) composites were used for the treatment of industrial wastewater. Bi-TNT were synthesized using two- and one-step anodization methods. The obtained composites were analyzed using X-ray diffraction, field emission scanning electron microscopy, UV–visible diffuse reflectance spectroscopy, Energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. For the two-step Bi-TNT composites, we investigated the effect of different Bi deposition times, Bi concentrations, and Bi deposition voltages on photodegradation efficiency. For the one-step Bi-TNT composites, we investigated the effect of different anodization voltages, anodization times, and Bi concentrations. Initially, the optimal synthesis conditions for two- and one-step Bi-TNT catalysts were identified and then these optimized conditions were used for industrial wastewater treatment that was collected from Banwol Sihwa Industrial Complex Republic of Korea. The Bi-TNT two- and one-step composites showed 2.0 and 2.5 times higher photocatalytic activity, respectively, for industrial wastewater treatment than that of TNT in visible-light. Recycling of Bi-TNT composites showed that the one-step composite method was more efficient and stable than the two-step method because Bi coupling and nanotube formation simultaneously occurred.
关键词： Recycling,Two- and one-step methods,Visible-light,Pollutant degradation,Bi-TiO2 composite
更新于2025-11-21 11:01:37
-
Liquid Crystal-Induced Myoblast Alignment
摘要： The ability to control cell alignment represents a fundamental requirement toward the production of tissue in vitro but also to create biohybrid materials presenting the functional properties of human organs. However, cell cultures on standard commercial supports do not provide a selective control on the cell organization morphology, and different techniques, such as the use of patterned or stimulated substrates, are developed to induce cellular alignment. In this work, a new approach toward in vitro muscular tissue morphogenesis is presented exploiting liquid crystalline networks. By using smooth polymeric films with planar homogeneous alignment, a certain degree of cellular order is observed in myoblast cultures with direction of higher cell alignment corresponding to the nematic director. The molecular organization inside the polymer determines such effects since no cell organization is observed using homeotropic or isotropic samples. These findings represent the first example of cellular alignment induced by the interaction with a nematic polymeric scaffold, setting the stage for new applications of liquid crystal polymers as active matter to control tissue growth.
关键词： liquid crystalline alignments,liquid crystalline network,cell alignment,biomaterials,muscular tissue engineering
更新于2025-11-21 11:01:37
-
One-Pot Synthesis of Gel Glass Embedded with Luminescent Silicon Nanoparticles
摘要： Preparation of highly luminescent glasses involves expensive and complicated processes and usually requires high temperature. In this work, we show that luminescent silicon (Si) nanoparticle (NP)- embedded silicate gel glasses can be developed under near-ambient conditions by a remarkably simple, one-pot strategy, without using any sophisticated instrumentation or technique. Simultaneous hydrolysis and reduction of (3-aminopropyl)triethoxysilane leads to the formation of colloidal Si nanocrystals that can be transformed to a glassy phase upon slow evaporation followed by freezing. Structural investigations reveal the formation of a sodium silicate gel glass framework having discernible shear bands, along with embedded Si NPs. High photoluminescence quantum yield (ca. 35?40%), low glass-transition temperature (Tg ≈ 66?73 °C), strain-tolerant mechanical stability, and inexpensive preparation make the glass attractive for applications as display materials and photonic converters.
关键词： luminescence,silicon,gel glass,nanoparticles,photon conversion
更新于2025-11-21 11:01:37