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https://www.readbyqxmd.com/read/28732982/sonochemical-green-reduction-to-prepare-ag-nanoparticles-decorated-graphene-sheets-for-catalytic-performance-and-antibacterial-application
#1
Sayan Ganguly, Poushali Das, Madhuparna Bose, Tushar Kanti Das, Subhadip Mondal, Amit Kumar Das, Narayan C Das
The emerging popularity and wide acceptance of green chemistry and environmentally benign/ecofriendly approaches have comprehensively considered for catalyst synthesis methods. Natural resource derived carbogenic quantum dots has been used in assistance with ultrasonic shock wave to graphene oxide (GO) aqueous dispersion in order to prepare reduced graphene oxide decorated with silver nanoparticles following the 'top-down' method. The total reduction process is done without using any toxic external reducing agents and any surfactants or stabilizers, thus it can be accepted as green method...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28726382/interparticle-reactions-an-emerging-direction-in-nanomaterials-chemistry
#2
K R Krishnadas, Ananya Baksi, Atanu Ghosh, Ganapati Natarajan, Anirban Som, Thalappil Pradeep
Nanoparticles exhibit a rich variety in terms of structure, composition, and properties. However, reactions between them remain largely unexplored. In this Account, we discuss an emerging aspect of nanomaterials chemistry, namely, interparticle reactions in solution phase, similar to reactions between molecules, involving atomically precise noble metal clusters. A brief historical account of the developments, starting from the bare, gas phase clusters, which led to the synthesis of atomically precise monolayer protected clusters in solution, is presented first...
July 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28720896/nanoscale-control-of-amyloid-self-assembly-using-protein-phase-transfer-by-host-guest-chemistry
#3
Tae Su Choi, Hong Hee Lee, Young Ho Ko, Kwang Seob Jeong, Kimoon Kim, Hugh I Kim
Amyloid fibrils have recently been highlighted for their diverse applications as functional nanomaterials in modern chemistry. However, tight control to obtain a targeted fibril length with low heterogeneity has not been achieved because of the complicated nature of amyloid fibrillation. Herein, we demonstrate that fibril assemblies can be homogeneously manipulated with desired lengths from ~40 nm to ~10 μm by a phase transfer of amyloid proteins based on host-guest chemistry. We suggest that host-guest interactions with cucurbit[6]uril induce a phase transfer of amyloid proteins (human insulin, human islet amyloid polypeptide, hen egg lysozyme, and amyloid-β 1-40 & 1-42) from the soluble state to insoluble state when the amount of cucurbit[6]uril exceeds its solubility limit in solution...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28704605/protein-adsorption-to-charged-gold-nanospheres-as-a-function-of-protein-deformability
#4
Jordan M Dennison, Jennifer M Zupancic, Wayne Lin, Jonathan H Dwyer, Catherine J Murphy
The corona that forms as protein adsorbs to gold nanospheres (AuNSs) is directly influenced by the surface chemistry of the AuNS. Tools to predict adsorption outcomes are needed for intelligent design of nanomaterials for biological applications. We hypothesized that the denaturation behavior of a protein might be a useful predictor of adsorption behavior to AuNSs, and used this idea to study protein adsorption to anionic citrate capped AuNSs and to cationic poly(allylamine hydrochloride) (PAH) wrapped AuNSs...
July 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28703684/development-of-antifungal-therapies-using-nanomaterials
#5
Katarzyna Niemirowicz, Bonita Durnaś, Ewelina Piktel, Robert Bucki
The number and diversity of chemical structures currently available as antibacterial drugs is much higher compared with the number of active substances in relation to pathogenic fungi. In this review we focus on nanotechnology approaches, which offer promising strategies to create nanoagents that possess broad-spectrum antifungal activity and might overcome mechanisms of antibiotic resistance. Special attention was given to magnetic nanoparticles and their ability to restrict fungal growth directly, which depends on surface chemistry and pathogen strains...
July 13, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28699173/porous-silicon-nanoparticle-delivery-of-tandem-peptide-anti-infectives-for-the-treatment-of-pseudomonas-aeruginosa-lung-infections
#6
Ester J Kwon, Matthew Skalak, Alessandro Bertucci, Gary Braun, Francesco Ricci, Erkki Ruoslahti, Michael J Sailor, Sangeeta N Bhatia
There is an urgent need for new materials to treat bacterial infections. In order to improve antibacterial delivery, an anti-infective nanomaterial is developed that utilizes two strategies for localization: i) a biodegradable nanoparticle carrier to localize therapeutics within the tissue, and ii) a novel tandem peptide cargo to localize payload to bacterial membranes. First, a library of antibacterial peptides is screened that combines a membrane-localizing peptide with a toxic peptide cargo and discovers a tandem peptide that displays synergy between the two domains and is able to kill Pseudomonas aeruginosa at sub-micromolar concentrations...
July 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28686409/structural-characterization-of-bio-functionalized-gold-nanoparticles-by-ultrahigh-resolution-mass-spectrometry
#7
Simone Nicolardi, Yuri E M van der Burgt, Jeroen D C Codée, Manfred Wuhrer, Cornelis H Hokke, Fabrizio Chiodo
Bio-functionalized gold nanoparticles (AuNPs) enable innovative translational research and development in biomedicine. Biomolecules such as peptides, proteins, lipids and carbohydrates can be assembled onto AuNPs to yield nanomaterials with unique properties for applications in imaging, photothermal therapy, vaccination strategies and drug delivery. The characterization of functionalized AuNPs still remains an analytical challenge that normally requires the combination of multiple techniques. Laser desorption/ionization (LDI) and matrix-assisted LDI (MALDI) has been applied successfully in combination with time-of-flight (TOF) mass spectrometry (MS) for the analysis of surface chemistry of AuNPs functionalized with synthetic ligands, however only for ligands with a molecular mass limited to 1000 Da...
July 7, 2017: ACS Nano
https://www.readbyqxmd.com/read/28681950/recent-applications-of-nanomaterials-in-capillary-electrophoresis
#8
REVIEW
Miguel Ángel González-Curbelo, Diana Angélica Varela-Martínez, Bárbara Socas-Rodríguez, Javier Hernández-Borges
Nanomaterials have found an important place in Analytical Chemistry and, in particular, in Separation Science. Among them, metal-organic frameworks, magnetic and non-magnetic nanoparticles, carbon nanotubes and graphene, as well as their combinations, are the most important nanomaterials that have been used up to now. Concerning capillary electromigration techniques, these nanomaterials have also been used as both pseudostationary phases in electrokinetic chromatography (EKC) and as stationary phases in microchip capillary electrophoresis (CE) and capillary electrochromatography (CEC), as a result of their interesting and particular properties...
July 6, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28677847/physicochemical-characteristics-of-pristine-and-functionalized-graphene
#9
Shawn E Bourdo, Radwan Al Faouri, Robert Sleezer, Zeid A Nima, Andersen Lafont, Bijay P Chhetri, Mourad Benamara, Betty Martin, Gregory J Salamo, Alexandru S Biris
Graphene-based nanomaterials have received significant attention in the last decade due to their interesting properties. Its electrical and thermal conductivity and strength make graphene well suited for a variety of applications, particularly for use as a composite material in plastics. Furthermore, much work is taking place to utilize graphene as a biomaterial for uses such as drug delivery and tissue regeneration scaffolds. Owing to the rapid progress of graphene and its potential in many marketplaces, the potential toxicity of these materials has garnered attention...
July 5, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28664967/two-coexisting-liquid-phases-in-switchable-ionic-liquids
#10
Juan Yao, David B Lao, Xiao Sui, Yufan Zhou, Satish K Nune, Xiang Ma, Tyler P Troy, Musa Ahmed, Zihua Zhu, David J Heldebrant, Xiao-Ying Yu
Switchable ionic liquids (SWILs) derived from organic bases and alcohols are attractive due to their applications in gas capture, separations, and nanomaterial synthesis. However, their exact solvent structure still remains a mystery. We present the first chemical mapping of a SWIL solvent structure using in situ time-of-flight secondary ion mass spectrometry. In situ chemical mapping discovers two coexisting liquid phases and molecular structures vastly different from conventional ionic liquids. SWIL chemical speciation is found to be more complex than the known stoichiometry...
June 30, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28661341/engineering-two-dimensional-materials-surface-chemistry
#11
Chih-Jen Shih
This account reviews our recent research activities and achievements in the field of two-dimensional (2D) materials surface chemistry. 2D materials are atomically thin, so that carriers are less-restricted to move in the in-plane direction, whereas the out-of-plain motion is quantum-confined. Semiconductor quantum wells and graphene are two well-known examples. Applications of 2D materials in optoelectronics, surface modification, and complex materials must overcome engineering challenges associated with understanding and engineering surface chemistry of 2D materials, which essentially bridge multiscale physical phenomena...
November 30, 2016: Chimia
https://www.readbyqxmd.com/read/28660952/a-novel-generation-of-hybrid-photochromic-vinylidene-naphthofuran-silica-nanoparticles-through-fine-tuning-of-surface-chemistry
#12
Tânia V Pinto, Céu M Sousa, Carlos A D Sousa, Mohamed M Aboelhassan, Andreia F Peixoto, Clara Pereira, Paulo J Coelho, Cristina Freire
Novel photochromic 1-vinylidene-naphtho[2,1-b]furan derivatives (VNF-1 and VNF-2) were successfully anchored onto silica nanoparticles (SiO2 NPs) through direct adsorption (SiO2@VNF-1) and covalent post-grafting (SiO2@VNF-2). SiO2 NPs with different sizes (15 ± 3 and 123 ± 7 nm) and surface chemistry (pHpzc in the range of 5-9) were used, offering a wide range of possibilities to fabricate tailor-made photochromic materials. The characterization of VNF-based SiO2 NPs confirmed the efficient VNF immobilization and the integrity of both organic and inorganic components...
July 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28652367/spatially-resolved-multicolor-cspbx3-nanowire-heterojunctions-via-anion-exchange
#13
Letian Dou, Minliang Lai, Christopher S Kley, Yiming Yang, Connor G Bischak, Dandan Zhang, Samuel W Eaton, Naomi S Ginsberg, Peidong Yang
Halide perovskites are promising semiconductor materials for solution-processed optoelectronic devices. Their strong ionic bonding nature results in highly dynamic crystal lattices, inherently allowing rapid ion exchange at the solid-vapor and solid-liquid interface. Here, we show that the anion-exchange chemistry can be precisely controlled in single-crystalline halide perovskite nanomaterials when combined with nanofabrication techniques. We demonstrate spatially resolved multicolor CsPbX3 (X = Cl, Br, I, or alloy of two halides) nanowire heterojunctions with a pixel size down to 500 nm with the photoluminescence tunable over the entire visible spectrum...
July 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28632260/visualization-of-the-protein-corona-towards-a-biomolecular-understanding-of-nanoparticle-cell-interactions
#14
Maria Kokkinopoulou, Johanna Simon, Katharina Landfester, Volker Mailänder, Ingo Lieberwirth
The use of nanocarriers in biology and medicine is complicated by the current need to understand how nanoparticles interact in complex biological surroundings. When nanocarriers come into contact with serum, proteins immediately adsorb onto their surface, forming a protein corona which defines their biological identity. Although the composition of the protein corona has been widely determined by proteomics, its morphology still remains unclear. In this study we show for the first time the morphology of the protein corona using transmission electron microscopy...
June 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28620178/collision-induced-activation-towards-industrially-scalable-approach-to-graphite-nanoplatelets-functionalization-for-superior-polymer-nanocomposites
#15
Omid Zabihi, Mojtaba Ahmadi, Tahereh Abdollahi, Saeid Nikafshar, Minoo Naebe
Scale-up manufacturing of engineered graphene-like nanomaterials to deliver the industry needs for development of high-performance polymer nanocomposites still remains a challenge. Herein, we introduce a quick and cost-effective approach to scalable production of functionalized graphite nanoplatelets using "kitchen blender" approach and Diels-Alder chemistry. We have shown that, in a solvent-free process and through a cycloaddition mechanism, maleic anhydride can be grafted onto the edge-localized electron rich active sites of graphite nanoplatelets (GNP) resulting from high collision force, called "graphite collision-induced activation"...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28618993/new-perspectives-on-biomedical-applications-of-iron-oxide-nanoparticles
#16
Massimiliano Magro, Davide Baratella, Emanuela Bonaiuto, Jessica de Almeida Roger, Fabio Vianello
Iron oxide nanomaterials are considered promising tools for improved therapeutic efficacy and diagnostic applications in biomedicine. Accordingly, engineered iron oxide nanomaterials are increasingly proposed in biomedicine, and the interdisciplinary researches involving physics, chemistry, biology (nanotechnology) and medicine have led to exciting developments in the last decades. The progresses of the development of magnetic nanoparticles with tailored physico-chemical and surface properties produced a variety of clinically relevant applications, spanning from magnetic resonance imaging (MRI), drug delivery, magnetic hyperthermia, to in vitro diagnostics...
June 16, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28617586/research-progress-towards-the-practical-applications-of-lithium-sulfur-li-s-batteries
#17
Joshua Lochala, Dianying Liu, Bingbin Wu, Cynthia Robinson, Jie Xiao
The renaissance of Li-S battery technology is witnessed by the intensive R&D efforts in recent years. Although the theoretical capacity and energy of a Li-S battery is theoretically very high, the projected usable energy is expected to be no more than twice that of state-of-art Li-ion batteries, or 500 Wh/kg. The recent "sulfur fever" has certainly gathered new knowledge on sulfur chemistry and electrochemistry, electrolytes, lithium metal and their interactions in this "new" system; however, a real advance towards a practical Li-S battery is still missing...
June 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28604901/flow-directed-synthesis-of-spatially-variant-arrays-of-branched-zinc-oxide-mesostructures
#18
Abhiteja Konda, Stephen A Morin
The use of fluid flow to control crystal morphology during the liquid-phase synthesis of inorganic nanomaterials is a relatively under explored approach. Synthetic strategies that take advantage of flow effects present the opportunity to tune several parameters (e.g., flow velocity and direction) in addition to conventional growth parameters (e.g., time, temperature, chemistry, and concentration), and thus enable additional levels of control in the bottom-up synthesis of nanomaterials. The current work reports the application of microfluidics to the rational synthesis of spatially variant arrays of branched zinc oxide (ZnO) nanorods with predictable morphological and compositional characteristics...
June 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28600894/gluing-ionic-liquids-to-oxide-surfaces-chemical-anchoring-of-functionalized-ionic-liquids-by-vapor-deposition-onto-cobalt-ii-oxide
#19
Tao Xu, Tobias Waehler, Julia Vecchietti, Adrian Bonivardi, Tanja Bauer, Johannes Schwegler, Peter S Schulz, Peter Wasserscheid, Joerg Libuda
Ionic liquids (IL) hold a great potential as novel electrolytes for applications in electronic materials and energy technology. The functionality of ILs in these applications relies on their interface to semiconducting nanomaterials. Therefore, methods to control the chemistry and structure of this interface are the key to assemble new IL-based electronic and electrochemical materials. Here, we present a new method to prepare a chemically well-defined interface between an oxide and an IL film. An imidazolium-based IL, which is carrying an ester group, is deposited onto cobalt oxide surface by evaporation...
June 10, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28589933/towards-colloidal-spintronics-through-rashba-spin-orbit-interaction-in-lead-sulphide-nanosheets
#20
Mohammad Mehdi Ramin Moayed, Thomas Bielewicz, Martin Sebastian Zöllner, Carmen Herrmann, Christian Klinke
Employing the spin degree of freedom of charge carriers offers the possibility to extend the functionality of conventional electronic devices, while colloidal chemistry can be used to synthesize inexpensive and tunable nanomaterials. Here, in order to benefit from both concepts, we investigate Rashba spin-orbit interaction in colloidal lead sulphide nanosheets by electrical measurements on the circular photo-galvanic effect. Lead sulphide nanosheets possess rock salt crystal structure, which is centrosymmetric...
June 7, 2017: Nature Communications
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