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Silicon nanoparticles

Wu-Chao Zhai, Tie-Zhu Qiao, Dong-Jin Cai, Wen-Jie Wang, Jing-Dong Chen, Zhi-Hui Chen, Shao-Ding Liu
Third-harmonic generation with metallic or dielectric nanoparticles often suffer from, respectively, small modal volumes and weak near-field enhancements. This study propose and demonstrate that a metallic/dielectric hybrid nanostructure composed of a silver double rectangular nanoring and a silicon square nanoplate can be used to overcome these obstacles for enhanced third-harmonic generation. It is shown that the nonradiative anapole mode of the Si plate can be used as a localized source to excite the dark subradiant octupole mode of the Ag ring, and the mode hybridization leads to the formation of an antibonding and a bonding subradiant collective mode, thereby forming anticrossing double Fano resonances...
November 28, 2016: Optics Express
A El Amili, M C M M Souza, F Vallini, N C Frateschi, Y Fainman
We experimentally investigate the application of magnetic fluids (MFs) on integrated silicon photonics. Using a ferrofluid-clad silicon microring resonator, we demonstrate active control of resonances by applying an external magnetic field. Relatively high loaded quality factors on the order of 6000 are achieved, despite the optical losses introduced by the magnetic nanoparticles. We demonstrate resonance shifts of 185 pm in response to a 110 Oe strong magnetic field, corresponding to an overall refractive index change of -3...
December 1, 2016: Optics Letters
Mary K Burdette, Ragini Jenkins, Yuriy Bandera, Rhonda R Powell, Terri F Bruce, Xi Yang, Yanzhang Wei, Stephen H Foulger
A fluorophore modified nanoparticle was developed that can only fluoresce when a specific environmental parameter interacts with the system. The model system consisted of an azide modified bovine serum albumin (azBSA) that had been covalently attached to an alkyne modified silicon phthalocyanine (alSiPc) derivative through a copper catalyzed azide/alkyne Huisgen cycloaddition (click reaction). The azBSA/alSiPc assembly was then clicked to a ca. 67 nm poly(propargyl acrylate) (PA) nanoparticle (PA/azBSA/alSiPc)...
November 28, 2016: Nanoscale
Christopher T Turner, Steven J P McInnes, Elizabeth Melville, Allison J Cowin, Nicolas H Voelcker
Flightless I (Flii) is elevated in human chronic wounds and is a negative regulator of wound repair. Decreasing its activity improves healing responses. Flii neutralizing antibodies (FnAbs) decrease Flii activity in vivo and hold significant promise as healing agents. However, to avoid the need for repeated application in a clinical setting and to protect the therapeutic antibody from the hostile environment of the wound, suitable delivery vehicles are required. In this study, the use of porous silicon nanoparticles (pSi NPs) is demonstrated for the controlled release of FnAb to diabetic wounds...
November 21, 2016: Advanced Healthcare Materials
Amina L Mohamed, Mehrez E El-Naggar, Th I Shaheen, Ahmed G Hassabo
As per to silver nanoparticles/silicon dioxide nanoparticles (SiO2@AgNPs) properties (e.g., conductivity, reactant, adsorption, detachment and antimicrobial), many researchers were focused on its preparation technique. A core/shell of silicon dioxide and silver nanoparticles (SiO2@AgNPs) has been prepared by facile route. The as synthesized core/shell nanoparticles were chemically modified with two different silan compounds, nominated, vinyltriethoxysilan (VTEOS) and (3-aminopropyl)trimethoxysilan (APTEOS)...
November 16, 2016: International Journal of Biological Macromolecules
Sultan Şevik Eliçora, Duygu Erdem, Aykut Erdem Dinç, Özlem Altunordu Kalaycı, Baki Hazer, Gamze Yurdakan, Canan Külah
Infection is a serious complication after nasal packing that otolaryngologists seek to avoid. The aim of this study is to investigate the use of silver (Ag) nanoparticle, which serves as antimicrobial agents, with nasal tampons. The study design is an experimental animal model and the setting is tertiary referral center. Twenty-four rats were randomized into the following four groups: (1) control group (n = 6); (2) silicone nasal splint (SNS) group (n  =  6); (3) polypropylene-grafted polyethylene glycol (PP-g-PEG) amphiphilic graft copolymer-coated SNS group (n  =  6); and (4) Ag nanoparticle-embedded PP-g-PEG (Ag-PP-g-PEG) amphiphilic graft copolymer-coated SNS group (n  =  6)...
November 18, 2016: European Archives of Oto-rhino-laryngology
Zhiliang Zhang, Wenxiu He, Jianzhong Zheng, Guangquan Wang, Jianbing Ji
Nanofluids, colloidal suspensions consisting of base fluids and nanoparticles, are a new generation of engineering working fluids. Nanofluids have shown great potential in heat/mass transfer applications. However, their practical applications are limited by the high production cost and low stability. In this study, a low-cost agricultural waste, rice husk ash (RHA), was used as a silicon source to the synthesis of silica nanofluids. First, silica nanoparticles with an average size of 47 nm were synthesized...
December 2016: Nanoscale Research Letters
Tobias Schmidt, Rodrigo Q Albuquerque, Rhett Kempe, Stephan Kümmel
We investigate the electronic structure of a Palladium nanoparticle that is partially embedded in a matrix of silicon carbonitride. From classical molecular dynamics simulations we first obtain a representative atomic structure. This geometry then serves as input to density-functional theory calculations that allow us to access the electronic structure of the combined system of particle and matrix. In order to make the computations feasible, we devise a subsystem strategy for calculating the relevant electronic properties...
November 15, 2016: Physical Chemistry Chemical Physics: PCCP
M Santana, J O Estevez, V Agarwal, R Herrera-Becerra
Porous silicon (PS) substrates, with different pore sizes and morphology, have been used to crystallize hydroxyapatite (HA) nano-fibers by an easy and economical procedure using a co-precipitation method at room temperature. In situ formation of HA nanoparticles, within the meso- and macroporous silicon structure, resulted in the formation of nanometer-sized hydroxyapatite crystals on/within the porous structure. The X-ray diffraction technique was used to determine the tetragonal structure of the crystals...
December 2016: Nanoscale Research Letters
Ali Rafati, Alexander G Shard, David G Castner
Gold nanoparticles (AuNPs) with average diameters of ∼14 and ∼40 nm, as well as flat gold coated silicon wafers, were functionalized with oligo ethylene glycol (OEG) terminated 1-undecanethiol (HS-CH2)11 self-assembled monolayers (SAMs). Both hydroxyl [(OEG)4OH] and methoxy [(OEG)4OMe] terminated SAMs were prepared. The AuNPs were characterized with transmission electron microscopy (TEM), time of flight secondary ion mass spectrometry (ToF-SIMS), x-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier infrared spectroscopy (ATR-FTIR), and low-energy ion scattering (LEIS)...
November 9, 2016: Biointerphases
Tadashi Kajiya, Sanghyuk Wooh, Yunchan Lee, Kookheon Char, Doris Vollmer, Hans-Jürgen Butt
We studied the condensation of water drops on a micro-structured lubricant-infused surfaces. Hierarchical micro-prism surfaces were fabricated by soft imprinting with wet TiO2 nanoparticle paste. After hydrophobization, the patterned surfaces were infused with silicone oil as a lubricant. When cooling at high humidity (over 80%), water drops nucleate and start growing on the surface. Once they have reached a certain size, the drops at neighboring channels of the micro-prisms attract each other and spontaneously form cylindrical chains...
November 9, 2016: Soft Matter
Gongjie Xu, Jun Zhang, Xiaofei Zang, Okihiro Sugihara, Hongwei Zhao, Bin Cai
An ultra-broadband perfect absorber based on graded-index mechanism is designed and fabricated. The perfect absorber is comprised of a heavily-doped silicon absorption substrate and a flat six-layer antireflective structure. The refractive index of each layer was widely tuned by hollow polystyrene microsphere and TiO<sub>2</sub> nanoparticle dopants, which can offer a gradually changed refractive index profile from 1.3 to 2.9. The experimental results show that 98% absorption can be achieved within the range of 0...
October 3, 2016: Optics Express
Zongya Zhao, Ruxue Gong, Liang Zheng, Jue Wang
In order to reduce the impedance and improve in vivo neural recording performance of our developed Michigan type silicon electrodes, rough-surfaced AuPt alloy nanoparticles with nanoporosity were deposited on gold microelectrode sites through electro-co-deposition of Au-Pt-Cu alloy nanoparticles, followed by chemical dealloying Cu. The AuPt alloy nanoparticles modified gold microelectrode sites were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and in vivo neural recording experiment...
November 3, 2016: Sensors
Yong-Ping Dong, Jiao Wang, Ying Peng, Jun-Jie Zhu
Electrogenerated chemiluminescence (ECL) of semiconductor quantum dots (QDs) has been considered as a powerful technique in the fabrication of biosensor, however, high-toxicity of heavy metal ion containing in QDs severely limits their further applications, and the search for the alternative benign nanomaterials with high ECL efficiency is urgent. Herein, ECL behavior of eco-friendly silicon quantum dots (SiQDs) was reported in neutral aqueous condition. Stable and intense cathodic ECL emission was obtained in phosphate buffer solution (PBS) with K2S2O8 as coreactant...
October 13, 2016: Biosensors & Bioelectronics
Samuel Martin, Bharat Bhushan
Superoleophobic surfaces that exhibit self-cleaning, antifouling, low-drag, and anti-smudge properties with high transparency are of interest in industrial applications including optical devices, solar panels, and self-cleaning windows. In many superoleophobic surfaces created to date, the lack of mechanical durability has been an issue. In this work, for the first time, transparent, wear-resistant, superhydrophobic and superoleophobic surfaces were developed for polydimethylsiloxane (PDMS) using a simple and scalable fabrication technique...
November 1, 2016: Journal of Colloid and Interface Science
Kimberly D McCarthy, Rachel M Donovan
BACKGROUND: Toxic epidermal necrolysis (TEN) is an exfoliative disorder of the skin usually caused by a drug reaction. The primary goal of wound care for patients with TEN is prevention of further mechanical trauma to the skin, along with management of wound infection. CASE: A 77-year-old woman with TEN was successfully managed with a perforated silver soft contact foam and a superabsorbent outer layer. Topical therapy combined nanoparticle silver for management of wound infection and minimized trauma to the skin as only the outer layer needed to be changed...
November 2016: Journal of Wound, Ostomy, and Continence Nursing
Hairui Ren, Zhaoyang Chen, Xin Zhang, Yongmei Zhao, Zheng Wang, Zhenglong Wu, Haijun Xu
Concentrations of S-Adenosyl-L-Methionine (SAM) in aqueous solution and fermentation liquids were quantitatively determined by surface-enhanced Raman scattering (SERS) and verified by high-pressure liquid chromatography (HPLC). The Ag nanoparticle/silicon nanowire array substrate was fabricated and employed as an active SERS substrate to indirectly measure the SAM concentration. The linear relationship between the integrated intensity of peak centered at ~2920 cm(-1) in SERS spectra and the SAM concentration was established, and the limit of detections of SAM concentrations was analyzed to be ~0...
2016: Journal of Analytical Methods in Chemistry
Deborah S Jacobs, Sin-Ru Huang, Yu-Lun Cheng, Savelas A Rabb, Justin M Gorham, Peter J Krommenhoek, Lee L Yu, Tinh Nguyen, Lipiin Sung
Many coatings properties such as mechanical, electrical, and ultra violet (UV) resistance are greatly enhanced by the addition of nanoparticles, which can potentially increase the use of nanocoatings for many outdoor applications. However, because polymers used in all coatings are susceptible to degradation by weathering, nanoparticles in a coating may be brought to the surface and released into the environment during the life cycle of a nanocoating. Therefore, the goal of this study is to investigate the process and mechanism of surface degradation and potential particle release from a commercial nanosilica/polyurethane coating under accelerated UV exposure...
September 2016: Journal of Coatings Technology and Research
Natalie A Belsey, David J H Cant, Caterina Minelli, Joyce R Araujo, Bernd Bock, Philipp Brüner, David G Castner, Giacomo Ceccone, Jonathan D P Counsell, Paul M Dietrich, Mark H Engelhard, Sarah Fearn, Carlos E Galhardo, Henryk Kalbe, Jeong Won Kim, Luis Lartundo-Rojas, Henry S Luftman, Tim S Nunney, Johannes Pseiner, Emily F Smith, Valentina Spampinato, Jacobus M Sturm, Andrew G Thomas, Jon P W Treacy, Lothar Veith, Michael Wagstaffe, Hai Wang, Meiling Wang, Yung-Chen Wang, Wolfgang Werner, Li Yang, Alexander G Shard
We report the results of a VAMAS (Versailles Project on Advanced Materials and Standards) inter-laboratory study on the measurement of the shell thickness and chemistry of nanoparticle coatings. Peptide-coated gold particles were supplied to laboratories in two forms: a colloidal suspension in pure water and; particles dried onto a silicon wafer. Participants prepared and analyzed these samples using either X-ray photoelectron spectroscopy (XPS) or low energy ion scattering (LEIS). Careful data analysis revealed some significant sources of discrepancy, particularly for XPS...
October 27, 2016: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Antonio Di Bartolomeo, Maurizio Passacantando, Gang Niu, Viktoria Schlykow, Grzegorz Lupina, Filippo Giubileo, Thomas Schroeder
We apply molecular beam epitaxy to grow GeSn-nanoparticles on top of Si-nanopillars patterned onto p-type Si wafers. We use x-ray photoelectron spectroscopy to confirm a metallic behavior of the nanoparticle surface due to partial Sn segregation as well as the presence of a superficial Ge oxide. We report the observation of stable field emission (FE) current from the GeSn-nanoparticles, with turn on field of [Formula: see text] and field enhancement factor β ∼ 100 at anode-cathode distance of ∼0.6 μm...
November 2, 2016: Nanotechnology
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