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aluminum nanoparticles

Loren Ochoa, Nubia Zuverza-Mena, Illya A Medina-Velo, Juan Pedro Flores-Margez, José R Peralta-Videa, Jorge L Gardea-Torresdey
The interaction of CuO nanoparticles (nCuO), a potential nanopesticide, with the growth hormone indole-3-acetic acid (IAA) is not well understood. This study aimed to evaluate the nutritional components in seeds of green pea (Pisum sativum) cultivated in soil amended with nCuO at 50 or 100mgkg-1 , with/without IAA at 10 or 100μM. Similar treatments including bulk CuO (bCuO) and CuCl2 were set as controls. Bulk CuO at 50mgkg-1 reduced seed yield (52%), compared with control. Bulk CuO at 50mgkg-1 and nCuO at 100mgkg-1 , plus IAA at 100μM, increased iron in seeds (41 and 42%, respectively), while nCuO at 50mgkg-1 , plus IAA at 100μM reduced boron (80%, respect to control and 63%, respect to IAA at 100μM)...
April 12, 2018: Science of the Total Environment
Nassim Ben Brahim, Mélanie Poggi, Jean-Christophe Lambry, Naim Bel Haj Mohamed, Rafik Ben Chaâbane, Michel Negrerie
We aimed to quantify the interaction of water-soluble-functionalized CdS quantum dots (QDs) with metal cations from their composition and physical properties. From the diameter of thioglycerol-capped nanoparticles (TG-CdS QDs) measured by electronic microscopy ( D = 12.3 ± 0.3 nm), we calculated the molecular mass of the individual particle MAQD = (3 ± 0.5) × 106 g·mol-1 and its molar absorption coefficient ε450 = 21 × 106 M-1 ·cm-1 . We built a three-dimensional model of the TG-CdS QDs in agreement with the structural data, which allowed us to quantify the number of thioglycerol grafted chains to ∼2000 per QD...
April 12, 2018: Inorganic Chemistry
Kai Zhang, Shaojuan Luo, Zewei Liu, Chao Li, Ke Zheng, Xin Yan, Ying Wu, Hongxia Xi
Amphiphilic surfactants are widely used as templates to synthesize hierarchically structured zeolites due to their multiple functions; however, piloting such new dual-functional templates is limited by its nature of time-consuming and high cost. Herein, a simple organic molecule, without a long hydrophobic alkyl chain, was tailored from a gemini-type, poly-quaternary ammonium surfactant and effectively used as a dual-porogenic template to synthesize hierarchical MTW zeolite. Upon a range of synthesis parameters optimization, our detailed characterizations suggested that the hierarchical MTW zeolite would completely crystallize within 36 hours from the surface to inside of quasi - spherical particles through in situ consumption of amorphous silicon and aluminum species, much faster than most of the hierarchical MTW zeolite generated by conventional methods...
April 12, 2018: Chemistry: a European Journal
Lucas Vazquez Besteiro, Xiang-Tian Kong, Zhiming Wang, Federico Rosei, Alexander O Govorov
The need for energy-saving materials is pressing. This paper reports on the design of energy-saving glasses and films based on plasmonic nanocrystals that efficiently block infrared radiation. Designing such plasmonic composite glasses is nontrivial and requires to take full advantage of both material and shape-related properties of the nanoparticles. We compute the performance of solar plasmonic glasses incorporating a transparent matrix and specially-shaped nanocrystals. The performance of glasses made with a given nanocrystal ensemble depend on its shape and material...
April 5, 2018: Nano Letters
Chih-Ting Liu, Chia-Chan Tsai, Chien-Wei Chu, Mu-Huan Chi, Pei-Yun Chung, Jiun-Tai Chen
We study the dewetting behaviors of poly(methyl methacrylate) (PMMA) thin films coated in the cylindrical nanopores of anodic aluminum oxide (AAO) templates by thermal annealing. Self-assembled monolayers (SAMs) of n-octadecyltrichlorosilane (ODTS) are introduced to modify the pore surfaces of the AAO templates to induce the dewetting process. By using scanning electron microscopy (SEM), the dewetting-induced morphology transformation from the PMMA thin films to PMMA nanoparticles with asymmetric shapes can be observed...
April 5, 2018: Soft Matter
Qinli Zhang, Yong Ding, Kaihong He, Huan Li, Fuping Gao, Taylor J Moehling, Xiaohong Wu, Jeremy Duncan, Qiao Niu
Alumina nanoparticles (AlNP) have been shown to accumulate in organs and penetrate biological barriers which lead to toxic effects in many organ systems. However, it is not known whether AlNP exposure to female mice during pregnancy can affect the development of the central nervous system or induce neurodevelopmental toxicity in the offspring. The present study aims to examine the effect of AlNP on neurodevelopment and associated underlying mechanism. ICR strain adult female mice were randomly divided into four groups, which were treated with normal saline (control), 10 μm particle size of alumina (bulk-Al), and 50 and 13 nm AlNP during entire pregnancy period...
2018: Frontiers in Pharmacology
Claudia Scalfi-Happ, Zhenxin Zhu, Susanna Graefe, Arno Wiehe, Anastasia Ryabova, Victor Loschenov, Rainer Wittig, Rudolf W Steiner
BACKGROUND: Organic crystalline nanoparticles (NPs) are not fluorescent due to the crystalline structure of the flat molecules organized in layers. In earlier experiments with Aluminum Phthalocyanine (AlPc)-derived NPs, the preferential uptake and dissolution by macrophages was demonstrated [3]. Therefore, inflamed tissue or cancer tissue with accumulated macrophages may exhibit specific fluorescence in contrast to healthy tissue which does not fluoresce. The present study addresses the photobiological effects of NP generated from Temoporfin (mTHPC), a clinically utilized photosensitizer belonging to the chlorin family...
March 19, 2018: Photodiagnosis and Photodynamic Therapy
Seokho Kim, Do Hyoung Kim, Jinho Choi, Hojin Lee, Sun-Young Kim, Jung Woon Park, Dong Hyuk Park
We report the growth and nanoscale luminescence characteristics of 8-hydroxyquinolinato aluminum (Alq₃) with a crystalline hexagonal column morphology. Pristine Alq₃ nanoparticles (NPs) were prepared using a conventional reprecipitation method. Crystal hexagonal columns of Alq₃ were grown by using a surfactant-assisted self-assembly technique as an adjunct to the aforementioned reprecipitation method. The formation and structural properties of the crystalline and non-crystalline Alq₃ NPs were analyzed with scanning electron microscopy and X-ray diffraction...
March 22, 2018: Materials
Ana Luz Muñoz-Rosas, Arturo Rodríguez-Gómez, Juan Carlos Alonso-Huitrón
Nowadays, the use of plasmonic metal layers to improve the photonic emission characteristics of several semiconductor quantum dots is a booming tool. In this work, we report the use of silicon quantum dots (SiQDs) embedded in a silicon nitride thin film coupled with an ultra-thin gold film (AuNPs) to fabricate light emitting devices. We used the remote plasma enhanced chemical vapor deposition technique (RPECVD) in order to grow two types of silicon nitride thin films. One with an almost stoichiometric composition, acting as non-radiative spacer; the other one, with a silicon excess in its chemical composition, which causes the formation of silicon quantum dots imbibed in the silicon nitride thin film...
March 22, 2018: Nanomaterials
Kun Wu, Yuanyuan Chen, Yongqiang Ouyang, Hang Lei, Ting Liu
Granular zirconium-aluminum hybrid adsorbent (GZAHA) was fabricated for efficient defluoridation of groundwater in filter application. GZAHA was formed through the aggregation of massive Zr/Al oxide nanoparticles with an amorphous pattern. This adsorbent has a satisfactory mechanical strength, a specific surface area of 29.55 m2 /g, and numerous hydroxyl groups on the surface. F adsorption equilibrium could be achieved within 12 h, and the sorption process followed a pseudo-second-order reaction rate. The maximum adsorption capacity of F estimated from the Langmuir model was 65...
March 21, 2018: Environmental Science and Pollution Research International
Vincent A Spata, Emily A Carter
Nanoparticles synthesized from plasmonic metals can absorb low-energy light, producing an oscillation/excitation of their valence electron density that can be utilized in chemical conversions. For example, heterogeneous photocatalysis can be achieved within heterometallic antenna-reactor complexes (HMARCs), by coupling a reactive center at which a chemical reaction occurs to a plasmonic nanoparticle that acts as a light-absorbing antenna. For example, HMARCs composed of aluminum antennae and palladium (Pd) reactive centers have been demonstrated recently to catalyze selective hydrogenation of acetylene to ethylene...
March 20, 2018: ACS Nano
David Florián-Algarín, Raúl Marrero, Xiaochun Li, Hongseok Choi, Oscar Marcelo Suárez
This study sought to characterize aluminum nanocomposite wires that were fabricated through a cold-rolling process, having potential applications in TIG (tungsten inert gas) welding of aluminum. A206 (Al-4.5Cu-0.25Mg) master nanocomposites with 5 wt % γAl₂O₃ nanoparticles were first manufactured through a hybrid process combining semi-solid mixing and ultrasonic processing. A206/1 wt % γAl₂O₃ nanocomposites were fabricated by diluting the prepared master nanocomposites with a monolithic A206 alloy, which was then added to a pure aluminum melt...
March 10, 2018: Materials
Ilzira A Minigalieva, Boris A Katsnelson, Larisa I Privalova, Marina P Sutunkova, Vladimir B Gurvich, Vladimir Y Shur, Ekaterina V Shishkina, Irene E Valamina, Oleg H Makeyev, Vladimir G Panov, Anatoly N Varaksin, Tatiana V Bushueva, Renata R Sakhautdinova, Svetlana V Klinova, Svetlana N Solovyeva, Ekaterina Y Meshtcheryakova
Stable suspensions of metal/metalloid oxide nanoparticles (MeO-NPs) obtained by laser ablation of 99.99% pure elemental aluminum, titanium or silicon under a layer of deionized water were used separately, or in three binary combinations, or in a ternary combination to induce subchronic intoxications in rats. To this end, the MeO-NPs were repeatedly injected intraperitoneally (i.p.) 18 times during 6 weeks before measuring a large number of functional, biochemical, morphological and cytological indices for the organism's status...
March 13, 2018: International Journal of Molecular Sciences
Yu Cheng, Xiaoxiao Tan, Jinping Wang, Yidan Wang, Yilin Song, Qing You, Qi Sun, Li Liu, Siyu Wang, Fengping Tan, Jiao Li, Nan Li
Recently, ultrasmall gadolinium oxide (Gd2 O3 ) nanoparticles with high longitudinal relaxation rate have received enormous attention. However, it can't be concentrated in tumor site through intravenous administration due to its ultrasmall size. In this project, we coated ultrasmall Gd2 O3 nanoparticles with a near-infrared (NIR) light-absorbing polymer polypyrrole (PPy), modifying with hyaluronic acid (HA) and loaded aluminum phthalocyanine (AlPc), the Gd2 O3 @PPy/AlPc-HA nanoparticles could be used for fluorescence (FL)/magnetic resonance (MR)/photoacoustic (PA) imaging guided as well as remotely controlled PTT/PDT combined anti-tumor therapy...
March 9, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Weiwei Zhang, Guoyou Huang, Kelvin Ng, Yuan Ji, Bin Gao, Liqing Huang, Jinxiong Zhou, Tian Jian Lu, Feng Xu
Hydrogel particles that can be engineered to compartmentally culture cells in a three-dimensional (3D) and high-throughput manner have attracted increasing interest in the biomedical area. However, the ability to generate hydrogel particles with specially designed structures and their potential biomedical applications need to be further explored. This work introduces a method for fabricating hydrogel particles in an ellipsoidal cap-like shape (i.e., ellipsoidal cap-like hydrogel particles) by employing an open-pore anodic aluminum oxide membrane...
March 7, 2018: Biomaterials Science
Sara Naderizadeh, Athanassia Athanassiou, Ilker S Bayer
HYPOTHESIS: Nanoparticle films are one of the most suitable platforms for obtaining sub-micrometer and nanometer dual-scale surface texture required for liquid repellency. The assembly of superhydrophobic nanoparticles into conformal and strongly adherent films having abrasion-induced wear resistance still poses a significant challenge. Various techniques have been developed over the years to render nanoparticle films with good liquid repellent properties and transparency. However, forming abrasion resistant superhydrophobic nanoparticle films on hard surfaces is challenging...
February 24, 2018: Journal of Colloid and Interface Science
Mingming Liu, Yuanyuan Hou, Jing Li, Lu Tie, Zhiguang Guo
Superhydrophobic surfaces with micro-/nanohierarchical structures are mechanically weak. Generally, organic solvents are used to dissolve or disperse organic adhesives and modifiers to enhance the mechanical strength of superhydrophobic surfaces. In this work, an all-water-based spraying solution is developed for the preparation of robust superhydrophobic surfaces, which contains ZnO nanoparticles, aluminum phosphate as an inorganic adhesive, and polytetrafluoroethylene with low surface energy. The all-water-based system is appreciated for low price and less pollution...
February 19, 2018: Journal of Colloid and Interface Science
Niels de Jonge, Andreas Verch, Hendrix Demers
The spatial resolution of aberration-corrected annular dark field scanning transmission electron microscopy was studied as function of the vertical position z within a sample. The samples consisted of gold nanoparticles (AuNPs) positioned in different horizontal layers within aluminum matrices of 0.6 and 1.0 µm thickness. The highest resolution was achieved in the top layer, whereas the resolution was reduced by beam broadening for AuNPs deeper in the sample. To examine the influence of the beam broadening, the intensity profiles of line scans over nanoparticles at a certain vertical location were analyzed...
February 2018: Microscopy and Microanalysis
Nan Ye, Zhuang Wang, Se Wang, Hao Fang, Degao Wang
This study investigated the impact of dissolved organic matters (DOM) on the ecological toxicity of aluminum oxide nanoparticles (Al2 O3 NPs) at a relatively low exposure concentration (1 mg L-1 ). The unicellular green alga Scenedesmus obliquus was exposed to Al2 O3 NP suspensions in the presence of DOM (fulvic acid) at various concentrations (1, 10, and 40 mg L-1 ). The results show that the presence of DOM elevated the growth inhibition toxicity of Al2 O3 NPs towards S. obliquus in a dose-dependent manner...
February 22, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
M Ghalavand, M Saadati, A Ahmadi, E Abbasi, J Salimian
OBJECTIVES: The present study was aimed at comparing tetanus toxoid (TT)‑loaded-chitosan nanoparticles with aluminum hydroxide as a common vaccine adjuvant. BACKGROUND: Tetanus remains to be a major public health problem. Nanoparticles have been extensively used as immune adjuvants. Tetanus toxoid (TT) encapsulated in chitosan nanoparticles is considered to be a promising tetanus vaccine candidate. METHODS: TT‑loaded chitosan nanoparticles were prepared by the ionic gelation method...
2018: Bratislavské Lekárske Listy
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