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#33091894   2020/10/22 To Up

All-dielectric Multifunctional Transmittance-Tunable Metasurfaces Based on Guided-Mode Resonance and ENZ Effect.

Electrically tunable metasurfaces open new doors for manipulating the phase, amplitude and polarization of light in ultrathin layers. Compared with metal assisted metasurfaces, all-dielectric transmission metasurfaces with outstanding feature of low loss, especially incorporating with new electro-optical materials, show great potentials for the next generation flat optics. In this study, by combining the epsilon-near-zero (ENZ) effect in indium tin oxide (ITO) with guided-mode resonance (GMR), we propose novel electrically tunable all-dielectric metasurface architectures with versatile functions for widespread potential applications. The inserted periodic ITO and hafnium oxide (HfO2) layers sandwiched in silicon act as two metal-oxide-semiconductor (MOS) capacitors in a single period to disturb the resonance wavelength in the near-infrared spectral range under voltage applied. For one-dimension (1D) structure, the transmittances of this metasurface at 1512 and 1510 nm change 20 and -14 dB under 0~5 V bias voltage, respectively. Besides, the bilayer structure performs well in double-waveband applications, indicating that more layers can support more operation wavebands. Meanwhile, the two-dimension (2D) structure works as a polarization insensitive device when setting the same structural parameters in both orthogonal directions. The proposed architectures, with various merits including ultra-compact size, high-speed and complementary metal-oxide-semiconductor (CMOS) compatibility, provides a multifunctional and multi-degree-of-freedom design, as well as enormous potential applications in more complicated flat optics.
Xiaoming Qiu, Jian Shi, Yanping Li, Fan Zhang

1384 related Products with: All-dielectric Multifunctional Transmittance-Tunable Metasurfaces Based on Guided-Mode Resonance and ENZ Effect.

1005x96 well plate500 Units25 mg100100μg100tests 6 ml Ready-to-use 50 ug 500 samples 1000 tests

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#33091889   2020/10/22 To Up

Assembling your nanowire: An overview of composition tuning in ternary III-V nanowires.

The ability to grow defect-free nanowires in lattice-mismatched material systems and to design their properties has made them ideal candidates for applications in fields as diverse as nanophotonics, nanoelectronics and medicine. After studying nanostructures consisting of elemental and binary compound semiconductors, scientists turned their attention to more complex systems - ternary nanowires. Composition control is key in these nanostructures since it enables bandgap engineering. The use of different combinations of compounds and different growth methods has resulted in numerous investigations. The aim of this review is to present a survey of the material systems studied to date, and to give a brief overview of the issues tackled and the progress achieved in nanowire composition tuning. We focus on ternary IIIIIIV nanowires (AlGaAs, AlGaP, AlInP, InGaAs, GaInP and InGaSb) and IIIVVnanowires (InAsP, InAsSb, InPSb, GaAsP, GaAsSb and GaSbP).
Masoomeh Ghasemi, Egor D Leshchenko, Jonas Johansson

1098 related Products with: Assembling your nanowire: An overview of composition tuning in ternary III-V nanowires.

100 μg1001 mL200 50ug100 μg96 tests100 100 μg1 mg

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#33091884   2020/10/22 To Up

Development of electrically conductive porous silk fibroin/CNF scaffolds.

Tissue engineering applications typically require 3D scaffolds which provide requisite surface area for cellular functions, while allowing nutrient, waste and oxygen transportation with the surrounding tissues. Concurrently, scaffolds should ensure sufficient mechanical properties to provide mechanically stable frameworks under physiologically relevant stress levels. In the meantime, electrically conductive platforms are also desired for the regeneration of specific tissues, where electrical impulses are transmitted throughout the tissue for proper physiological functioning. Towards this goal, carbon nanofibers (CNFs) were incorporated into silk fibroin (SF) scaffolds whose pore size and porosity were controlled during salt leaching process. In our methodology, CNFs were dispersed in SF owing to the hydrogen bond forming ability of hexafluoro-2-propanol (HFIP), a fluoroalcohol used as a solvent for silk fibroin. Results showed enhanced electrical conductivity and mechanical properties upon the incorporation of CNFs into the SF scaffolds, while metabolic activities of cells cultured on SF/CNF nanocomposite scaffolds were significantly improved via optimizing CNF content, porosity and pore size range of the scaffolds. Specifically, SF/CNF nanocomposite scaffolds having electrical conductivities as high as 0.023 S/cm and tangent modulus values of 260±30 kPa, while having porosity as high as 78% and pore size of 376±53 µm were fabricated -for the first time- in literature. Furthermore, ~34% increase in the wettability of SF was achieved upon the incorporation of 10% CNF, which provided enhanced fibroblast spreading on scaffold surfaces.
Yiğithan Tufan, Hayriye Öztatlı, Bora Garipcan, Batur Ercan

2584 related Products with: Development of electrically conductive porous silk fibroin/CNF scaffolds.

300 units0.1ml (1mg/ml)1 mL96T 5 G

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#33091882   2020/10/22 To Up

Magnetic properties of γ-FeOnanoparticles in a porous SiOshell for drug delivery.

A method is presented for synthesizing core-shell nanoparticles with a magnetic core and a porous shell suitable for drug delivery and other medical applications. The core contains multiple $\gamma$-Fe$_2$O$_3$ nanoparticles ($\sim$15~nm) enclosed in a SiO$_2$ ($\sim$100-200~nm) matrix using either methyl (denoted TMOS-$\gamma$-Fe$_2$O$_3$) or ethyl (TEOS-$\gamma$-Fe$_2$O$_3$) template groups. Low-temperature M{\"o}ssbauer spectroscopy showed that the magnetic nanoparticles have the maghemite structure, $\gamma$-Fe$_2$O$_3$, with all the vacancies in the octahedral sites. Saturation magnetization measurements revealed that the density of $\gamma$-Fe$_2$O$_3$ was greater in the TMOS-$\gamma$-Fe$_2$O$_3$ nanoparticles than TEOS-$\gamma$-Fe$_2$O$_3$ nanoparticles, presumably because of the smaller methyl group. Magnetization measurements showed that the blocking temperature is around room temperature for the TMOS-$\gamma$-Fe$_2$O$_3$ and around 250~K for the TEOS-$\gamma$-Fe$_2$O$_3$. Three dimensional topography analysis shows clearly that the magnetic nanoparticles are not only at the surface but have penetrated deep in the silica to form the core-shell structure.
Saeed Kamali, Erick Yu, Brian Bates, James Russell McBride, Charles E Johnson, Valentin Taufour, Pieter Stroeve

1950 related Products with: Magnetic properties of γ-FeOnanoparticles in a porous SiOshell for drug delivery.

100 assays100 assays100 assays100 assays100 assays100 assays100 assays100 assays100 assays100 assays

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#33091869   2020/10/06 To Up

Colloidal stability of cellulose nanocrystals in aqueous solutions containing monovalent, divalent, and trivalent inorganic salts.

Aggregation kinetics and surface charging properties of rod-like sulfated cellulose nanocrystals (CNCs) have been investigated in aqueous suspensions containing monovalent, divalent, or trivalent inorganic salts. Electrophoresis and time-resolved dynamic light scattering (DLS) were used to characterize the surface charge and colloidal stability of the CNCs, respectively. The surface charge and aggregation kinetics of the sulfated CNCs were found to be independent of solution pH (pH range 2-10). For the monovalent salts (CsCl, KCl, NaCl, and LiCl), the critical coagulation concentration (CCC) followed the order of Cs < K < Na < Li, which follows the direct Hofmeister series, indicating specific interaction of the cations with the CNCs surface. The experimental aggregation kinetics of CNCs were in very good agreement with predictions based on the classic Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. A Hamaker constant of 3.6 × 10 J for the CNCs in aqueous medium was derived, for the first time, from the colloidal stability curves with monovalent salts. This value is consistent with a previous value determined by direct force measurements for cellulose surfaces in aqueous solutions. For the divalent salts (MgCl, CaCl, and BaCl), the CCC values followed the order Mg > Ca > Ba, which is in the reverse order of the counterion ionic size. For the trivalent salts (LaCl, AlCl, and FeCl), the CNCs suspension was destabilized much more effectively. The observed complex stability curves with AlCl and FeCl are attributed to charge neutralization and charge reversal imparted by the adsorption of aluminum and ferric hydrolysis species on the CNC surface. The significant charge reversal induced by the ferric hydrolysis species led to the restabilization of suspensions. Our results on the colloidal stability of CNCs are of central importance to the nanotechnology and materials science communities working on various applications of CNCs.
Tianchi Cao, Menachem Elimelech

2406 related Products with: Colloidal stability of cellulose nanocrystals in aqueous solutions containing monovalent, divalent, and trivalent inorganic salts.

480/kit480/kit1 mg1 mg25 mg1 mg500 tests100 assays10

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#33091832   2020/10/06 To Up

Exploring the use of Mobile applications by cancer patients undergoing chemotherapy: A scoping review.

Advancements in mobile technology, primarily through the use of applications, may support the process of monitoring adherence to oral therapies, controlling toxicities, or providing self-care guidelines to patients undergoing chemotherapy treatment. This study aims to assemble the available knowledge regarding the use of mobile applications by cancer patients undergoing chemotherapy treatment.
Bruno Magalhães, Carla Fernandes, Juan Miguel Martinez-Galiano, Célia Santos

2224 related Products with: Exploring the use of Mobile applications by cancer patients undergoing chemotherapy: A scoping review.

Each0.1 mg

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#33091815   2020/10/19 To Up

Machine learning analysis of DNA methylation in a hypoxia-immune model of oral squamous cell carcinoma.

Hypoxia status and immunity are related with the development and prognosis of oral squamous cell carcinoma (OSCC). Here, we constructed a hypoxia-immune model to explore its upstream mechanism and identify potential CpG sites.
Hao Zeng, Meng Luo, Linyan Chen, Xinyu Ma, Xuelei Ma

2203 related Products with: Machine learning analysis of DNA methylation in a hypoxia-immune model of oral squamous cell carcinoma.



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