keyword
MENU ▼
Read by QxMD icon Read
search

nano catalysis

keyword
https://www.readbyqxmd.com/read/28803469/chiral-ceramic-nanoparticles-of-tungsten-oxide-and-peptide-catalysis
#1
Shuang Jiang, Mahshid Chekini, Zhi-Bei Qu, Yichun Wang, Aydan Yeltik, Yuangang Liu, Alex Kotlyar, Tianyong Zhang, Bin Li, Hilmi Volkan Demir, Nicholas A Kotov
The chirality of nanoparticles (NPs) and their assemblies has been investigated predominantly for noble metals and II-VI semiconductors. However, ceramic NPs represent the majority of nanoscale materials in Nature. The robustness and other innate properties of ceramics offer technological opportunities in catalysis, biomedical sciences, and optics. Here we report the preparation of chiral ceramic NPs, as represented by tungsten oxide hydrate, WO3-x·H2O, dispersed in ethanol. The chirality of the metal oxide core, with an average size of ca 1...
August 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28775270/a-sustainable-nanocomposite-au-salen-cc-for-catalytic-degradation-of-eosin-y-and-chromotrope-2r-dyes
#2
Vishal J Mayani, Suranjana V Mayani, Sang Wook Kim
Up to now, a very few catalysts have been developed approaching the heterogeneous catalytic degradation of Eosin Y and Chromotrope 2R dyes (Acid Red 29). The present study provides a complete perspective of recyclable nanocomposite Au(Salen)@CC for catalytic degradation of hazardous water pollutant dyes viz., Eosin Y & Chromotrope 2R using mild reaction conditions. New gold Salen complex doped carbon nanocomposite Au(Salen)@CC was developed by easy methodology using nano carbon cage (CC) prepared from low-priced Pyrolysis fuel oil (PFO) residue based Pitch...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28771319/preparation-and-self-assembly-of-dendronized-janus-fe3o4-pt-and-fe3o4-au-heterodimers
#3
Davit Jishkariani, Yaoting Wu, Da Wang, Yang Liu, Alfons van Blaaderen, Christopher B Murray
Janus nanoparticles (NPs) often referred to as nanosized analogs of molecular surfactants are amphiphilic structures with potential applications in materials science, biomedicine, and catalysis, and their synthesis and self-assembly into complex architectures remain challenging. Here, we demonstrate the preparation of Janus heterodimers via asymmetric functionalization of Fe3O4-Pt and Fe3O4-Au heterodimeric NPs. The hydrophobic and hydrophilic dendritic ligands that carry phosphonic acid and disulfide surface binding groups selectively coat the iron oxide and platinum (or gold) parts of the heterodimer, respectively...
August 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28766929/size-and-density-controllable-fabrication-of-platinum-nanoparticles-ito-electrode-by-pulse-potential-electrodeposition-for-ammonia-oxidation
#4
Siyuan Li, Haiyan Chen, Jie Liu, Yida Deng, Xiaopeng Han, Wenbin Hu, Cheng Zhong
The pulse potential electrodeposition was successfully utilized to electrochemically fabricate platinum nanoparticles on indium tin oxide (ITO) conductive glass substrate for catalysis towards ammonia electro-oxidation. The effect of deposition parameters (lower potential El, lower potential duration tl and upper potential duration tu) on the size and number density of Pt nanoparticles was investigated by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electrocatalytic activity of the Pt nanoparticles/ITO electrode for ammonia oxidation was characterized by the cyclic voltammetry (CV) method...
August 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28765849/peptide-binding-to-metal-oxide-nanoparticles
#5
S P Schwaminger, S A Blank-Shim, I Scheifele, P Fraga-García, S Berensmeier
Magnetic metal oxide nanoparticles demonstrate great applicability in several fields such as biotechnology, medicine and catalysis. A stable, magnetic and low-cost material, nanoscale magnetite, is an interesting adsorbent for protein purification. Downstream processing can account for up to 80% of the total production costs in biotechnological production. As such, the development of new innovative separation methods can be regarded as highly profitable. While short peptide sequences can be used as specific affinity tags for functionalised adsorber surfaces, they need expensive affinity ligands on the particle surface for adsorption...
August 2, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28745479/visualizing-local-morphology-and-conductivity-switching-in-interface-assembled-nanoporous-c60-thin-films
#6
Jean-Nicolas Tisserant, Tino Wagner, Patrick A Reissner, Hannes Beyer, Yuriy Fedoryshyn, Andreas Stemmer
Carbon materials promise a revolution in optoelectronics, medical applications, and sensing provided that their morphology can be controlled down to the nanometer scale. Nanoporous materials are particularly appealing as they offer a drastically enlarged interfacial area compared to the corresponding planar materials. Entire fields such as organic solar cells, catalysis, or sensing may profit from an enlarged interface and facilitated molecular interaction between a carbon material and the environment. Nanoporous fullerene thin films obtained by the deposition of suspended nanoclusters of fullerene were already reported but suffered from the limitation of the size of these particles to over 100 nm...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28735544/facile-fabrication-of-composite-electrospun-nanofibrous-matrices-of-poly-%C3%AE%C2%B5-caprolactone-silica-based-pickering-emulsion
#7
Archana Samanta, Sonam Takkar, Ritu Kulshreshtha, Bhanu Nandan, Rajiv K Srivastava
Functionalized matrices have been sought for their application in sensors, filtration, energy storage, catalysis, and tissue engineering. We report formation of an inorganic-organic composite matrix based on poly(ε-caprolactone) (PCL) functionalized with hydrophobically modified silica (m-silica) fabricated with reduced organic solvent usage. The matrix was obtained via electrospinning of a water-in-oil emulsion of PCL that was stabilized by judicious choice of m-silica as a Pickering agent resulting into an emulsifier free matrix...
August 4, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28723102/insight-into-copper-catalysis-in-situ-formed-nano-cu2o-in-suzuki-miyaura-cross-coupling-of-aryl-indolyl-boronates
#8
Ganapathy Ranjani, Rajagopal Nagarajan
A ligand-free copper catalyzed Suzuki-Miyaura coupling of 3,5-diiodopyridine with aryl and indole boronates has been explored in good to excellent yields. In situ generation of nano-Cu2O from CuCl2 under the reaction conditions has been discovered for the first time. The generality of the reaction was further demonstrated by the arylation of 5-iodopyrimidine, iodopyridines, iodobenzenes, and diiodobenzenes and resulted in good to moderate yields. Moreover, bisindole alkaloid Scalaridine A has been successfully synthesized in 60% overall yield...
July 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28723090/transformative-heterointerface-evolution-and-plasmonic-tuning-of-anisotropic-trimetallic-nanoparticles
#9
Mouhong Lin, Gyeong-Hwan Kim, Jae-Ho Kim, Jeong-Wook Oh, Jwa-Min Nam
Multicomponent nanoparticles that incorporate multiple nanocrystal domains into a single particle represent an important class of material with highly tailorable structures and properties. The controlled synthesis of multicomponent NPs with 3 or more components in the desired structure, particularly anisotropic structure, and property is, however, challenging. Here, we developed a polymer and galvanic replacement reaction-based transformative heterointerface evolution (THE) method to form and tune gold-copper-silver multimetallic anisotropic nanoparticles (MAPs) with well-defined configurations, including structural order, particle and junction geometry, giving rise to extraordinarily high tunability in the structural design, synthesis and optical property of trimetallic plasmonic nanoantenna structures...
July 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28721537/controlling-activation-barrier-by-carbon-nanotubes-as-nano-chemical-reactors
#10
Alia Méjri, Fabien Picaud, Mohammed El Khalifi, Tijani Gharbi, Bahoueddine Tangour
The oxidative addition of primary amine on a monocyclic phospholane was studied in confined conditions. This one-step chemical reaction has been investigated using the DFT technique to elucidate the role of confinement in carbon nanotubes on the reaction. Calculations were carried out by a progressive increase of the nanotube diameters from 10 Å to 15 Å in order to highlight the dependence of the reactivity on the nanotube diameter. First, single point investigations were dedicated to the study of reactants, transition states, and products placed in the different nanotubes while keeping their optimized structure as free compounds...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28713885/synergistic-effect-of-au-ag-nano-alloying-intense-seira-and-enhanced-catalysis
#11
Manoj Verma, M Boazbou Newmai, P Senthil Kumar
The well-known AuAg nanohybrid system was effectively synthesized, utilizing polyvinyl pyrrolidone (PVP) as a multiple metal precursor reducing agent (based solely on their reduction potentials), thereby drastically decreasing their activation energy of diffusion and readily facilitating the homogenous alloy nanoparticle formation, duly confirmed by Vegard's law. Furthermore, the crucial parameters in determining the local electric field enhancement in the vicinity of the alloy nanoparticles such as the quality factor Q, dephasing time, T2 and the homogenous line width Γ were also evaluated in a systematic manner, in correlation with their unique visible optical absorption spectra...
July 25, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28699627/nano-palladium-is-a-cellular-catalyst-for-in-vivo-chemistry
#12
Miles A Miller, Bjorn Askevold, Hannes Mikula, Rainer H Kohler, David Pirovich, Ralph Weissleder
Palladium catalysts have been widely adopted for organic synthesis and diverse industrial applications given their efficacy and safety, yet their biological in vivo use has been limited to date. Here we show that nanoencapsulated palladium is an effective means to target and treat disease through in vivo catalysis. Palladium nanoparticles (Pd-NPs) were created by screening different Pd compounds and then encapsulating bis[tri(2-furyl)phosphine]palladium(II) dichloride in a biocompatible poly(lactic-co-glycolic acid)-b-polyethyleneglycol platform...
July 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28684914/regulation-of-apoptosis-through-bcl-2-bax-proteins-expression-and-dna-damage-by-nano-sized-gadolinium-oxide
#13
Saud Alarifi, Huma Ali, Saad Alkahtani, Mohammed S Alessia
Gadolinium oxide (Gd2O3) nanoparticles (GNPs) are applied in industrial products, for example, additives, optical glass, and catalysis. There are various suggestions of metal nanoparticles paradigm but the underlying basic mechanism about the toxicity of metal nanoparticles, for example GNPs, remains unclear. This experiment was done to measure the effective toxicity of GNPs (10, 25, 50, and 100 µg/mL) over 24 and 48 h and to evaluate toxicity mechanism in human neuronal (SH-SY5Y) cells. GNPs produced reactive oxygen species (ROS), as evaluated by 2', 7'-dichlorodihydrofluorescein diacetate...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28671708/silica-based-hierarchical-porous-janus-microcapsules-construction-and-support-of-au-nano-particle-catalyst-inside
#14
Xia Kong, Changcheng Wu, Lei Feng, Jiayan Qu, Pange Liu, Xiaomei Wang, Xu Zhang
A facile and novel method was developed to fabricate silica-based hierarchical porous Janus microcapsules (HPJMs SiO2) for catalysis. The resulting Au@HPJMs SiO2 nanocomposites showed enhanced catalysis, great stability, convenient recovery and reuse without losing catalytic efficiency.
July 3, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28665585/cryotem-as-an-advanced-analytical-tool-for-materials-chemists
#15
Joseph P Patterson, Yifei Xu, Mohammad-Amin Moradi, Nico A J M Sommerdijk, Heiner Friedrich
Morphology plays an essential role in chemistry through the segregation of atoms and/or molecules into different phases, delineated by interfaces. This is a general process in materials synthesis and exploited in many fields including colloid chemistry, heterogeneous catalysis, and functional molecular systems. To rationally design complex materials, we must understand and control morphology evolution. Toward this goal, we utilize cryogenic transmission electron microscopy (cryoTEM), which can track the structural evolution of materials in solution with nanometer spatial resolution and a temporal resolution of <1 s...
July 18, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28661517/integrative-self-sorting-of-coordination-cages-based-on-naked-metal-ions
#16
Witold M Bloch, Guido H Clever
Coordination-driven self-assembly of metal ions and organic ligands has been extensively utilised over the past four decades to access a variety of nano-sized cage assemblies, with functions ranging from sensing and catalysis to drug delivery. Many of the reported examples, however, are highly symmetric architectures that contain one type of organic ligand carrying not more than a single functionality. This contrasts significantly with the level of structural and functional complexity encountered in biological macromolecular hosts, which are able to bind and chemically convert smaller molecules in their highly-decorated internal cavities...
July 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28661074/a-review-of-recent-developments-of-mesoporous-materials
#17
REVIEW
Steven L Suib
This personal account concerns novel recent discoveries in the area of mesoporous materials. Most of the papers discussed have been published within the last two to three years. A major emphasis of most of these papers is the synthesis of unique mesoporous materials by a variety of synthetic methods. Many of these articles focus on the control of the pore sizes and shapes of mesoporous materials. Synthetic methods of various types have been used for such control of porosity including soft templating, hard templating, nano-casting, electrochemical methods, surface functionalization, and trapping of species in pores...
June 29, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28630331/distinguishing-attosecond-electron-electron-scattering-and-screening-in-transition-metals
#18
Cong Chen, Zhensheng Tao, Adra Carr, Piotr Matyba, Tibor Szilvási, Sebastian Emmerich, Martin Piecuch, Mark Keller, Dmitriy Zusin, Steffen Eich, Markus Rollinger, Wenjing You, Stefan Mathias, Uwe Thumm, Manos Mavrikakis, Martin Aeschlimann, Peter M Oppeneer, Henry Kapteyn, Margaret Murnane
Electron-electron interactions are the fastest processes in materials, occurring on femtosecond to attosecond timescales, depending on the electronic band structure of the material and the excitation energy. Such interactions can play a dominant role in light-induced processes such as nano-enhanced plasmonics and catalysis, light harvesting, or phase transitions. However, to date it has not been possible to experimentally distinguish fundamental electron interactions such as scattering and screening. Here, we use sequences of attosecond pulses to directly measure electron-electron interactions in different bands of different materials with both simple and complex Fermi surfaces...
July 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28624746/textual-properties-and-catalytic-performances-of-halloysite-hybrid-ceo2-zro2-nanoparticles
#19
Jing Ouyang, Zai Zhao, Yi Zhang, Huaming Yang
Halloysite (Hal) hybridized ceria-zirconia solid solution material (CZ-Hal) for three way catalysis was synthesized through co-precipitation method. X-ray diffraction (XRD), N2 adsorption-desorption isotherms, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray energy dispersion spectrum (EDS), and temperature-programmed H2 reduction (H2-TPR) were used to characterize the crystalline, textural, morphological, and reducibility of the products. The three way catalytic performances of the supported products was tested in stoichiometric air/fuel condition...
June 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28574712/tracking-single-dna-nanodevices-in-hierarchically-meso-macroporous-antimony-doped-tin-oxide-demonstrates-finite-confinement
#20
Daniel Mieritz, Xiang Li, Alex Volosin, Minghui Liu, Hao Yan, Nils G Walter, Dong-Kyun Seo
Housing bio-nano guest devices based on DNA nanostructures within porous, conducting, inorganic host materials promise valuable applications in solar energy conversion, chemical catalysis, and analyte sensing. Herein, we report a single-template synthetic development of hierarchically porous, transparent conductive metal oxide coatings whose pores are freely accessible by large biomacromolecules. Their hierarchal pore structure is bimodal with a larger number of closely packed open macropores (∼200 nm) at the higher rank and with the remaining space being filled with a gel network of antimony-doped tin oxide (ATO) nanoparticles that is highly porous with a broad size range of textual pores mainly from 20-100 nm at the lower rank...
June 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
keyword
keyword
68168
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"