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aluminum nanoparticles

Bijender Singh
Effect of microparticles and silver nanoparticles was studied on the production of hydrolytic enzymes by a potent phytase-producing mould, Aspergillus oryzae SBS50. Addition of microparticles, viz. talc powder and aluminum oxide enhanced phytase production from 2894 to 3903 and 2847 to 4204 U/L, cellulase from 2529 to 4931 and 2455 to 3444 U/L, xylanase from 9067 to 9642 and 9994 to 14,783 U/L, amylase from 5880 to 11,000 and 6130 to 13,145 U/L, respectively. Fungal morphology was also engineered by the use of microparticles...
June 2018: 3 Biotech
Junais Habeeb Mokkath
Based on time dependent density functional theory calculations, we reveal radical modifications in the optical absorption spectra of pyridine molecules adsorbed on Ag and Al nanoparticles. Transition density plots of the dominant peaks allowed us to classify the excitations into the plasmonic excitation of the nanoparticle or charge-transfer excitations between the pyridine molecule and Ag/Al nanoparticle. More precisely, in the case of Ag-pyridine structures, the optical response does not change much with respect to the 90° reorientation of pyridine, but the transition density plots change significantly...
May 30, 2018: Physical Chemistry Chemical Physics: PCCP
Haiyan Li, Shuang Li, Feibiao Li, Zhike Li, Huaiyuan Wang
The facile and efficient encapsulation of a lubricant oil in SiO2 wrapped polystyrene microcapsules is accomplished using a Pickering polymerization technique. Triton X-100-IPTS fumed SiO2 nanoparticles are used as emulsifiers for the formation of O/W Pickering emulsions and the stability factor of the Pickering emulsions was investigated. The as-obtained microcapsules are characterized by scanning electron microscope, thermogravimetric analysis, Fourier transform infrared spectra and dynamic laser scattering...
May 23, 2018: Journal of Colloid and Interface Science
Naruphorn Dararatana, Farzad Seidi, Daniel Crespy
In 2015, the global cost of corrosion in the world was estimated to be around 2.5 trillion dollars and is continuously increasing. The active protection by corrosion inhibitors is a well-known technique for protecting metal against corrosion. However, one major disadvantage is that corrosion inhibitors can be leached in the environment, even when corrosion does not occur. We design and synthesize smart polymer/corrosion inhibitor conjugates as new generation of materials for corrosion protection. These materials release inhibitors upon acidification, which may occur either by acidic rain or as consequence of the metal corrosion process itself...
May 29, 2018: ACS Applied Materials & Interfaces
Jennifer L Gottfried, Dylan K Smith, Chi-Chin Wu, Michelle L Pantoya
A new synthesis approach for aluminum particles enables an aluminum core to be passivated by an oxidizing salt: aluminum iodate hexahydrate (AIH). Transmission electron microscopy (TEM) images show that AIH replaces the Al2 O3 passivation layer on Al particles that limits Al oxidation. The new core-shell particle reactivity was characterized using laser-induced air shock from energetic materials (LASEM) and results for two different Al-AIH core-shell samples that vary in the AIH concentration demonstrate their potential use for explosive enhancement on both fast (detonation velocity) and slow (blast effects) timescales...
May 23, 2018: Scientific Reports
Yuanna Zhu, Jianrong Wang, Yingzi Wang, Xueling Song, Yanan Xu, Ping Yang
Fe3O4@AlOOH adsorbent with high efficient adsorption capacity was successfully synthesized by controlling the hydrolysis rate for aluminum isopropoxide (AIP) and introducing inductive agent thioglycolic acid (TGA). Al(OH)3-TGA clusters played a key role in the formation of Fe3O4@AlOOH adsorbent with lamellar structure. Morphology characterization revealed that magnetic Fe3O4 nanoparticles were uniformly deposited on the surface of AlOOH. The lamellar structure of AlOOH and the strong magnetic intensity of Fe3O4 were helpful for its rapid separation from solution under external magnetic field...
January 1, 2018: Journal of Nanoscience and Nanotechnology
Alexei Khomenko, Miroslav Zakharov, Denis Boyko, Bo N J Persson
Background: The frictional properties of nanoparticles have been studied to gain insight into the fundamental origin of sliding friction. Results: Using molecular dynamics we investigate frictional properties of aluminum and palladium nanoparticles deposited on a graphene layer. We study the time evolution of the total momentum of the system, the total and potential energies, the temperature, the velocity and position of the center of mass, the dimensions of the nanoparticle, and the friction and substrate forces acting on the particle...
2018: Beilstein Journal of Nanotechnology
Yu Zhang, Qin Yue, Lei Yu, Xuanyu Yang, Xiu-Feng Hou, Dongyuan Zhao, Xiaowei Cheng, Yonghui Deng
Core-shell magnetic porous microspheres have wide applications in drug delivery, catalysis and bioseparation, and so on. However, it is great challenge to controllably synthesize magnetic porous microspheres with uniform well-aligned accessible large mesopores (>10 nm) which are highly desired for applications involving immobilization or adsorption of large guest molecules or nanoobjects. In this study, a facile and general amphiphilic block copolymer directed interfacial coassembly strategy is developed to synthesize core-shell magnetic mesoporous microspheres with a monolayer of mesoporous shell of different composition, such as core-shell magnetic mesoporous aluminosilicate (CS-MMAS), silica (CS-MMS), and zirconia-silica (CS-MMZS), open and large pores by employing polystyrene-block-poly (4-vinylpyridine) (PS-b-P4VP) as an interface structure directing agent and aluminum acetylacetonate (Al(acac)3 ), zirconium acetylacetonate, and tetraethyl orthosilicate as shell precursors...
May 11, 2018: Advanced Materials
Seo-Yeon Jung, Kyung Won Kang, Eun-Young Lee, Dong-Won Seo, Hong-Lim Kim, Hak Kim, TaeWoo Kwon, Hye-Lim Park, Hun Kim, Sang-Myeong Lee, Jae-Hwan Nam
The Middle East respiratory syndrome coronavirus (MERS-CoV) is a highly pathogenic and zoonotic virus with a fatality rate in humans of over 35%. Although several vaccine candidates have been developed, there is still no clinically available vaccine for MERS-CoV. In this study, we developed two types of MERS-CoV vaccines: a recombinant adenovirus serotype 5 encoding the MERS-CoV spike gene (Ad5/MERS) and spike protein nanoparticles formulated with aluminum (alum) adjuvant. Next, we tested a heterologous prime-boost vaccine strategy, which compared priming with Ad5/MERS and boosting with spike protein nanoparticles and vice versa, with homologous prime-boost vaccination comprising priming and boosting with either spike protein nanoparticles or Ad5/MERS...
May 5, 2018: Vaccine
Akhil Jain, Rina Koyani, Carlos Muñoz, Prakhar Sengar, Oscar E Contreras, Patricia Juárez, Gustavo A Hirata
Nanoparticle (NP) and photosensitizer (PS) conjugates capable of X-ray photodynamic therapy (X-PDT) are a research focus due to their potential applications in cancer treatment. Combined with X-PDT, appropriate imaging properties of the nanocomposite will make it suitable for theranostics of deep lying tumors. In this work, we describe the development of magnetic-luminescent Gd2.98 Ce0.02 Al5 O12 nanoparticles (GAG) coated with mesoporous silica (mSiO2 ) and loaded with rose bengal (RB) to yield a nanocomposite GAG@mSiO2 @RB capable of X-PDT...
April 27, 2018: Journal of Colloid and Interface Science
Sravya Tekumalla, Yogesh Nandigam, Nitish Bibhanshu, Shabadi Rajashekara, Chen Yang, Satyam Suwas, Manoj Gupta
Magnesium has been trending of late in automobile, aerospace, defense, sports, electronic and biomedical sectors as it offers an advantage in light-weighting. In aluminum, titanium, and steel dominated aerospace and defense sectors, applications of Mg were banned/restricted until recently due to perceived easy ignition and inability to self-extinguish immediately. Strength is generally inversely related to ductility, weak texture and unrelated to ignition resistance, making it challenging to optimize all four concurrently in a material...
May 4, 2018: Scientific Reports
Giray Buğra Akbaba, Hasan Türkez
The aim of this study was to investigate the genotoxicity of aluminum oxide (Al2 O3 ), β-tricalcium phosphate (β-TCP) (Ca3 (PO4 )2 ), and zinc oxide (ZnO) nanoparticles (NPs) that were 4.175, 9.058, and 19.8 nm sized, respectively, on human peripheral blood lymphocytes using micronucleus (MN) and chromosome aberration (CA) techniques. Aluminum oxide and β-TCP NPs did not show genotoxic effects on human peripheral blood cultures in vitro, even at the highest concentrations; therefore, these materials may be suitable for use as biocompatible materials...
January 1, 2018: International Journal of Toxicology
Anjie Zhang, Bin Mu, Xiaowen Wang, Lixin Wen, Aiqin Wang
Different kinds of aluminosilicate minerals were employed to fabricate CoAl2 O4 hybrid pigment for studying its formation and coloring mechanism. It revealed that the color of the obtained hybrid pigments was determined by the content of Al2 O3 and lightness of clay minerals. The higher the Al2 O3 content and the lightness of clay minerals, the better the color parameters of hybrid pigments. During the preparation of hybrid pigments, CoAl2 O4 nanoparticles were confined to be loaded on the surface of the aluminosilicate minerals, which effectively prevented from the aggregation and the size increase of CoAl2 O4 nanoparticles...
2018: Frontiers in Chemistry
Shu Zhang, Shengshi Huang, Lu Lu, Xinlei Song, Pingli Li, Fengshan Wang
Introduction: The development of ideal vaccine adjuvants for intranasal vaccination can provide convenience for many vaccinations. As an ideal intranasal vaccine adjuvant, it should have the properties of assisting soluble antigens to pass the mucosal barrier and potentiating both systemic and mucosal immunity via nasal administration. Methods: By using the advantages of polysaccharides, which can promote both T-helper 1 and 2 responses, curdlan sulfate (CS)- O -(2-hydroxyl)propyl-3-trimethyl ammonium chitosan chloride ( O -HTCC) nanoparticles were prepared by interacting CS with O -HTCC, and the adjuvancy of the nanoparticles was investigated...
2018: International Journal of Nanomedicine
Bingqian Lei, Mengfan Wang, Zelei Jiang, Wei Qi, Rongxin Su, Zhimin He
Metal-organic frameworks (MOFs), which are a unique class of hybrid porous materials built from metal ions and organic ligands, have attracted significant interest in recent years as a promising platform for controlled drug delivery. Current approaches for creating MOFs-based responsive drug carriers involve encapsulation of stimuli-responsive compositions into MOFs or post-synthetic surface modification with sensitive molecules. In this study, we developed a novel intrinsic redox-responsive MOFs carrier, MOF-M(DTBA) (M= Fe, Al or Zr) by using iron, aluminum or zirconium as metal nodes and 4,4'-dithiobisbenzoic acid (4,4'-DTBA) as the organic ligand...
April 25, 2018: ACS Applied Materials & Interfaces
Gérôme Melaet, Vitalie Stavila, Lennie Klebanoff, Gabor A Somorjai
Recent theoretical predictions indicate that functional groups and additives could have a favorable impact on the hydrogen adsorption characteristics of sorbents; however, no definite evidence has been obtained to date and little is known about the impact of such modifications on the thermodynamics of hydrogen uptake and overall capacity. In this work, we investigate the effect of two types of additives on the cryoadsorption of hydrogen to mesoporous silica. First, Lewis and Brønsted acid sites were evaluated by grafting aluminum to the surface of mesoporous silica (MCF-17) and characterizing the resulting silicate materials' surface area and the concentration of Brønsted and Lewis acid sites created...
May 3, 2018: Physical Chemistry Chemical Physics: PCCP
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)...
September 1, 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...
May 7, 2018: Inorganic Chemistry
Kai Zhang, Shaojuan Luo, Zewei Liu, Chao Li, Zheng Ke, 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 their time-consuming nature 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 parameter optimizations, our detailed characterization suggested that the hierarchical MTW zeolite would completely crystallize within 36 hours from the surface to the inside of quasi-spherical particles through in situ consumption of amorphous silicon and aluminum species; much faster than most of the hierarchical MTW zeolites generated by conventional methods...
June 7, 2018: Chemistry: a European Journal
Lucas V Besteiro, Xiang-Tian Kong, Zhiming Wang, Federico Rosei, Alexander O Govorov
The need for energy-saving materials is pressing. This Letter 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 taking full advantage of both material and geometrical properties of the nanoparticles. We compute the performance of solar plasmonic glasses incorporating a transparent matrix and specially shaped nanocrystals. This performance depends on the shape and material of such nanocrystals...
May 9, 2018: Nano Letters
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