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aluminum nanoparticles

Xue Zhang, James Joy, Chenwei Zhao, Jin-Ho Kim, Gustavo Fernandes, Jimmy Xu, James Valles
Anodic aluminum oxide (AAO) substrates with a self-ordered triangular array of nanopores provide the means to fabricate multiple forms of nano materials, such as nanowires and nanoparticles. This study focuses on nanostructures that emerge in thin films of metals thermally evaporated onto the surface of AAO. Previous work showed that films of different evaporated metals assume dramatically different structures, e.g. an ordered triangular array of nearly monodisperse nanoparticles forms for Lead(Pb) while a polycrystalline nanohoneycomb structure forms for Silver(Ag)...
January 17, 2017: Nanotechnology
W J Li, X L Zhou, B L Liu, J J Dai, P Song, Y Teng
:   BACKGROUND: Some mammalian oocytes have been successfully cryopreserved by vitrification. However, the survival and developmental rate of vitrified oocytes is still low. The incorporation of nanoparticles into cryoprotectant (CPA) may improve the efficiency of vitrification by changing the properties of solutions. MATERIALS AND METHODS: The toxicity of different concentrations of hydroxy apatite (HA), silica dioxide (SO2), aluminum oxide (Al2O3) and titanium dioxide (TiO2) nanoparticles (20 nm in diameter) to oocytes was tested and the toxicity threshold value of each nanoparticle was determined...
November 2016: Cryo Letters
Zeping Li, Zhimou Xu, Xiaopeng Qu, Shuangbao Wang, Jing Peng, Lihong Mei
How to use high aspect ratio anodic aluminum oxide (AAO) membranes as the etching and evaporation mask is one of the unsolved problems in the application of nanostructured arrays. Here we describe that the versatile utilizations of the highly ordered AAO membranes with high aspect ratio more than 20 as universal masks for formations of various nanostructure arrays on various substrates. The result shows that the fabricated nanopore and nanoparticle arrays of substrates inherit the regularity of the AAO membranes completely...
January 10, 2017: Nanotechnology
Wenjuan Tan, Wenchao Du, Ana C Barrios, Raul Armendariz, Nubia Zuverza-Mena, Zhaoxia Ji, Chong Hyun Chang, Jeffrey I Zink, Jose A Hernandez-Viezcas, Jose R Peralta-Videa, Jorge L Gardea-Torresdey
Little is known about the effects of surface coating on the interaction of engineered nanoparticles (ENPs) with plants. In this study, basil (Ocimum basilicum) was cultivated for 65 days in soil amended with unmodified, hydrophobic (coated with aluminum oxide and dimethicone), and hydrophilic (coated with aluminum oxide and glycerol) titanium dioxide nanoparticles (nano-TiO2) at 125, 250, 500, and 750 mg nano-TiO2 kg(-1) soil. ICP-OES/MS, SPAD meter, and UV/Vis spectrometry were used to determine Ti and essential elements in tissues, relative chlorophyll content, carbohydrates, and antioxidant response, respectively...
January 6, 2017: Environmental Pollution
Janine Kaden, Stephan I Brückner, Susanne Machill, Christoph Krafft, Andreas Pöppl, Eike Brunner
Iron incorporation into diatom biosilica was investigated for the species Stephanopyxis turris. It is known that several "foreign" elements (e.g., germanium, titanium, aluminum, zinc, iron) can be incorporated into the siliceous cell walls of diatoms in addition to silicon dioxide (SiO2). In order to examine the amount and form of iron incorporation, the iron content in the growth medium was varied during cultivation. Fe:Si ratios of isolated cell walls were measured by ICP-OES. SEM studies were performed to examine of a possible influence of excess iron during diatom growth upon cell wall formation...
January 7, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
Patrícia L Goto, Marigilson P Siqueira-Moura, Antonio C Tedesco
Cutaneous melanoma is the most aggressive skin cancer and is particularly resistant to current therapeutic approaches. Photodynamic therapy (PDT) is a well-established photoprocess that is employed to treat some cancers, including non-melanoma skin cancer. Aluminum chloride phthalocyanine (ClAlPc) is used as a photosensitizer in PDT; however, its high hydrophobicity hampers its photodynamic activity under physiological conditions. The aim of this study was to produce solid lipid nanoparticles (SLN) containing ClAlPc using the direct emulsification method...
January 4, 2017: International Journal of Pharmaceutics
N Manohar, F Reynoso, P Diagaradjane, S Krishnan, S Cho
PURPOSE: To demonstrate the ability to perform high-resolution imaging and quantification of sparse distributions of gold nanoparticles (GNPs) within ex vivo tumor samples using a highly-sensitive benchtop L-shell x-ray fluorescence (XRF) imaging system. METHODS: An optimized L-shell XRF imaging system was assembled using a tungsten-target x-ray source (operated at 62 kVp and 45 mA). The x-rays were filtered (copper: 0.08 mm & aluminum: 0.04 mm) and collimated (lead: 5 cm thickness, 3 cm aperture diameter) into a cone-beam in order to irradiate small samples or objects...
June 2016: Medical Physics
Francesco Todisco, Marco Esposito, Simone Panaro, Milena De Giorgi, Lorenzo Dominici, Dario Ballarini, Antonio I Fernández-Domínguez, Vittorianna Tasco, Massimo Cuscunà, Adriana Passaseo, Cristian Ciracì, Giuseppe Gigli, Daniele Sanvitto
Combining localized surface plasmons (LSPs) and diffractive surface waves (DSWs) in metallic nanoparticle gratings leads to the emergence of collective hybrid plasmonic-photonic modes known as surface lattice resonances (SLRs). These show reduced losses and therefore a higher Q factor with respect to pure LSPs, at the price of larger volumes. Thus, they can constitute a flexible and efficient platform for light-matter interaction. However, it remains an open question if there is, in terms of the Q/V ratio, a sizable gain with respect to the uncoupled LSPs or DSWs...
December 27, 2016: ACS Nano
Long Wen, Qin Chen, Xin Hu, Huacun Wang, Lin Jin, Qiang Su
Plasmonic scattering from metallic nanoparticles has been used for centuries to create the colorful appearance of stained glass. Besides their use as passive spectral filtering components, multifunctional optoelectronic applications can be achieved by integrating the nanoscatters with semiconductors that generate electricity using the complementary spectral components of plasmonic colors. To suppress the usual degradation of both efficiency and the gamut of plasmonic scattering coloration in highly asymmetric index configurations like a silicon host, aluminum nanodisks on indium tin oxide (ITO) coated silicon were experimentally studied and demonstrated color sorting in the full visible range along with photocurrent generation...
December 27, 2016: ACS Nano
Jamila Djafari, Catarina Marinho, Tiago Santos, Gilberto Igrejas, Carmen Torres, José Luis Capelo, Patricia Poeta, Carlos Lodeiro, Javier Fernández-Lodeiro
The Front Cover picture shows new silver (Ag) and gold (Au) nanoparticle-based tetracycline (TC) nanocomposites (AuNPs@TC and AgNPs@TC). A new synthetic methodology for the preparation of water-soluble Au and Ag nanoparticles, using the antibiotic TC as co-reducing and stabilizing agent, is reported. Both colloids exhibit high water stability, with an average size of 15±5 and 25±10 nm, respectively. Both composites are tested against TC-resistant bacteria, presenting an increasing antibacterial effect in the case of AgNPs@TC...
June 2016: ChemistryOpen
Fernando Vazquez-Garcia, Mário Tanomaru-Filho, Gisselle Moraima Chávez-Andrade, Roberta Bosso-Martelo, Maria Inês Basso-Bernardi, Juliane Maria Guerreiro-Tanomaru
Mineral trioxide aggregate (MTA) and Portland cement (PC) are calcium silicate cements. They have similar physicochemical, mechanical and biological properties. The addition of zirconium oxide (ZrO2) to PC provides radiopacity. Silver nanoparticles (AgNPs) may improve some properties of cements. The aim of this study was to evaluate the effect of AgNPs on physicochemical/mechanical properties and antibacterial activity of white MTA (WMTA) and PC associated with ZrO2. The following materials were evaluated: WMTA; PC 70% + ZrO2 30%; WMTA+ AgNPs; and PC 70% + ZrO2 30% + AgNPs...
September 2016: Brazilian Dental Journal
Yanyan Liang, Zhengping Liu
Ionic current rectification of nanofluidic diode membranes has been studied widely in recent years because it is analogous to the functionality of biological ion channels in principle. We report a new method to fabricate ionic current rectification membranes based on mesoporous silica confined in anodic aluminum oxide (AAO) membranes. Two types of mesostructured silica nanocomposites, hexagonal structure and nanoparticle stacked structure, were used to asymmetrically fill nanochannels of AAO membranes by a vapor-phase synthesis (VPS) method with aspiration approach and were further modified via sequence vapor infiltration (SVI) treatment...
December 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
Elizabeth A Thoryk, Gokul Swaminathan, Steven Meschino, Kara S Cox, Marian Gindy, Danilo R Casimiro, Andrew J Bett
A vast body of evidence suggests that nanoparticles function as potent immune-modulatory agents. We have previously shown that Merck proprietary Lipid NanoParticles (LNPs) markedly boost B-cell and T-cell responses to sub-unit vaccine antigens in mice. To further evaluate the specifics of vaccine delivery and dosing regimens in vivo, we performed immunogenicity studies in BALB/c and C57BL/6 mice using two model antigens, Hepatitis B Surface Antigen (HBsAg) and Ovalbumin (OVA), respectively. To assess the requirement for co-administration of antigen and LNP for the elicitation of immune responses, we evaluated immune responses after administering antigen and LNP to separate limbs, or administering antigen and LNP to the same limb but separated by 24 h...
December 6, 2016: Vaccines
Ankun Yang, Alexander J Hryn, Marc R Bourgeois, Won-Kyu Lee, Jingtian Hu, George C Schatz, Teri W Odom
Plasmonic nanostructures with enhanced localized optical fields as well as narrow linewidths have driven advances in numerous applications. However, the active engineering of ultranarrow resonances across the visible regime-and within a single system-has not yet been demonstrated. This paper describes how aluminum nanoparticle arrays embedded in an elastomeric slab may exhibit high-quality resonances with linewidths as narrow as 3 nm at wavelengths not accessible by conventional plasmonic materials. We exploited stretching to improve and tune simultaneously the optical response of as-fabricated nanoparticle arrays by shifting the diffraction mode relative to single-particle dipolar or quadrupolar resonances...
December 13, 2016: Proceedings of the National Academy of Sciences of the United States of America
Kyle T Hufziger, Sergei V Bykov, Sanford A Asher
We constructed the first deep ultraviolet (UV) Raman standoff wide-field imaging spectrometer. Our novel deep UV imaging spectrometer utilizes a photonic crystal to select Raman spectral regions for detection. The photonic crystal is composed of highly charged, monodisperse 35.5 ± 2.9 nm silica nanoparticles that self-assemble in solution to produce a face centered cubic crystalline colloidal array that Bragg diffracts a narrow ∼1.0 nm full width at half-maximum (FWHM) UV spectral region. We utilize this photonic crystal to select and image two different spectral regions containing resonance Raman bands of pentaerythritol tetranitrate (PETN) and NH4NO3 (AN)...
November 28, 2016: Applied Spectroscopy
NguyenThi Phuong, Anugrah Andisetiawan, Do Van Lam, Jeong Hwan Kim, Doo-Sun Choi, Kyung-Hyun Whang, Jeasun Nham, Yun Jung Lee, Yeong-Eun Yoo, Jae Sung Yoon
Since the ancient Egyptians had used sand as filter media for water purification, its principle has been inherited through generations and it is still being used now in industries. The sand filter consists of sand literally, and the voids within the sand bed are the pores for filtration. Here we present a filtration principle using nanoparticles, so that the voids between the nanoparticles can be considered as effective pores in nanoscale dimension. Anodic aluminum oxide (AAO) membrane has been used as the working template, and the nanoparticles have been injected and embedded within the pores of the AAO template...
November 23, 2016: Scientific Reports
Shahrara Afshar, Shabnam Pordel, Babak Tahmouresilerd, Alireza Azad
Visible light-driven Al-doped TiO2 with different aluminum contents (2, 5 and 10 mol%) were synthesized via a facile sol-gel method. Fourier transform infrared (FTIR), UV-visible diffuse reflectance, energy dispersive X-ray (EDX) spectroscopy as well as X-ray diffraction (XRD), X-ray fluorescence (XRF) and scanning electron microscopy (SEM) methods were used for the characterization of the obtained nanoparticles. The photocatalytic performance of the samples was evaluated by the degradation of rhodamine B (RhB) under visible light irradiation...
November 2016: Photochemistry and Photobiology
Ziyan Sun, Kai Cheng, Fengyu Wu, Hongguang Liu, Xiaowei Ma, Xinhui Su, Yang Liu, Liming Xia, Zhen Cheng
Grafting a robust organic shell around inorganic nanoparticles can optimize their colloidal features to dramatically improve their physicochemical properties. Here, we have developed a polymer coating procedure for providing colloidal stability to the nanoparticles and, more importantly, for applying a fast, facile fluorine-18 labeling of iron oxide nanoparticles (IONPs) for positron emission tomography (PET)/magnetic resonance (MR) dual-modality imaging. The structure of the amphiphilic polymer is based on a backbone of polyacrylic acid, conjugated with multiple oleylamines to form a comb-like branched structure...
December 1, 2016: Nanoscale
Abraham Vázquez-Guardado, Alexandra Smith, Wade Wilson, Jeanette Ortega, J Manuel Perez, Debashis Chanda
Simple optical techniques that can accurately and selectively identify organic and inorganic material in a reproducible manner are of paramount importance in biological sensing applications. In this work, we demonstrate that a nanoimprinted plasmonic pattern with locked-in dimensions supports sharp deterministic hybrid resonances when coupled with an optical cavity suitable for high sensitive surface detection. The surface sensing property of this hybrid system is quantified by precise atomic layer growth of aluminum oxide using the atomic layer deposition technique...
October 31, 2016: Optics Express
Hyejin Kim, Jonghye Choi, Handule Lee, Juyoung Park, Byung-Il Yoon, Seon Mi Jin, Kwangsik Park
Effects of nanoparticles (NPs) on skin corrosion and irritation using three-dimensional human skin models were investigated based on the test guidelines of Organization for Economic Co-operation and Development (OECD TG431 and TG439). EpiDerm(TM) skin was incubated with NPs including those harboring iron (FeNPs), aluminum oxide (AlNPs), titanium oxide (TNPs), and silver (AgNPs) for a defined time according to the test guidelines. Cell viabilities of EpiDerm(TM) skins were measured by the 3-(4, 5-dimethylthi-azol-2-yl)-2...
October 2016: Toxicological Research
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