pinecone/core-2020-05-10-deduplication huggingface dataset:
A versatile “click” chemistry precursor of functional polystyrene nanoparticles

4 páginas, 2 figuras.The synthesis of a versatile “click” chemistry precursor of functional polystyrene nanoparticles is reported. The resulting nanoparticles thereof offer inherent characteristics of ultrasmall polymeric nanoparticles (size ≈4 nm) plus interesting functionalization possibilities, opening the door to new hybrid, soft nano-objects, bridging the gap between synthetic and natural polymers.L. O. acknowledges Cidetec-Foundation for providing partial financial support and access to its facilities during her Undergraduate Thesis\ud
Project.Peer reviewe
Nanoscale Organic Hybrid Electrolytes

Nanoscale organic hybrid electrolytes are composed of organic-inorganic hybrid nanostructures, each with a metal oxide or metallic nanoparticle core densely grafted with an ion-conducting polyethylene glycol corona doped with lithium salt. These materials form novel solvent-free hybrid electrolytes that are particle-rich, soft glasses at room temperature; yet manifest high ionic conductivity and good electrochemical stability above 5V.Work on synthesis and mechanical characterization of nanoscale organic hybrid materials (NOHMs) was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). Our research on electrochemical characterization of NOHMs was supported by the Department of Energy Basic Energy Sciences program (Grant DE-FG02-07ER46455)). JN acknowledges support from a National Science Foundation Sustainable Materials IGERT fellowship program at Cornell
Nano-Layered Microneedles for Transcutaneous Delivery of Polymer Nanoparticles and Plasmid DNA

Multilayer-coated microneedles achieve transcutaneous delivery of plasmid DNA to the viable epidermis. Cy3-labeled plasmid DNA encoding luciferase (yellow) is deposited on biodegradable microneedle arrays through multilayer self-assembly and then delivered to the skin by microneedle application to achieve colocalization with Langerhans dendritic cells (MHC II-GFP–green).United States. Dept. of Defense (DAAD19- 02-D-0002)United States. Dept. of Defense (W911NF-07-D-0004)Ragon Institute of MGH, MIT and HarvardNational Institutes of Health (U.S.) (NIH Biotechnology Training Program at MIT)Howard Hughes Medical Institute (Investigator
Temperature as a single on-off parameter controlling nanoparticles growing, stabilization and fast disentanglement

Thermoresponsive nanoparticles are synthesized from ionic random terpolymer precursors. A distinct temperature-dependent aggregation-redissolution behavior is observed within a subtle balance between polymer ionic charge and hydrophobic content, which is used for colloidal synthesis of nanoparticles in aqueous medium and without surfactants. The solution thermal history provides a robust mean to customize the size of nanoparticles that can be disentangled on command.The authors acknowledge funding from EU Marie Curie Actions, Alea Jacta Est (MEST-CT-2004-008104) and Portuguese Foundation for Science and Technology (FCT) (SFRH/BPD/34545/2007). This work was carried out under the scope of the European NoE EXPERTISSUES (NMP3-CT-2004-500283)
A luminescent molecular thermometer for long-term absolute temperature measurements at the nanoscale

El pdf del artículo es la versión post-print.A unique Eu3+/Tb3+ luminescent self-referencing nanothermometer allowing absolute measurements in the 10–350 K temperature range and sub-micrometer spatial resolution is reported (see Figure). It has up to 4.9%·K−1 temperature sensitivity and high photostability for long-term use. The combination of molecular thermometry, superparamagnetism and luminescence in a nanometric host matrix provides multifunctionality opening the way for new exciting applications.We acknowledge Fundação para a Ciência e a Tecnologia (FCT, Portugal), COMPETE and FEDER programs (PTDC/CTM/101324/2008) and Integrated Spanish-Portuguese Action PT2009–0131 for fi nancial support. The work in Zaragoza has been supported by the grants MAT2007–61621 and CONSOLIDER CSD2007–00010 from the Ministry of Education. CDSB (SFRH/BD/38472/2007) and PPL (SFRH/BPD/34365/2006) thank FCT for grants.Peer Reviewe
Electric-Field-Induced Resistive Switching in a Family of Mott Insulators : towards Non-Volatile Mott-RRAM Memories

International audienceThe fundamental building blocks of modern silicon-based microelectronics, such as double gate transistors in non-volatile Flash memories, are based on the control of electrical resistance by electrostatic charging. Flash memories could soon reach their miniaturization limits mostly because reliably keeping enough electrons in an always smaller cell size will become increasingly difficult . The control of electrical resistance at the nanometer scale therefore requires new concepts, and the ultimate resistance-change device is believed to exploit a purely electronic phase change such as the Mott insulator to insulator transition [2]. Here we show that application of short electric pulses allows to switch back and forth between an initial high-resistance insulating state ("0" state) and a low-resistance "metallic" state ("1" state) in the whole class of Mott Insulator compounds AM4X8 (A = Ga, Ge; M= V, Nb, Ta; X = S, Se). We found that electric fields as low as 2 kV/cm induce an electronic phase change in these compounds from a Mott insulating state to a metallic-like state. Our results suggest that this transition belongs to a new class of resistive switching and might be explained by recent theoretical works predicting that an insulator to metal transition can be achieved by a simple electric field in a Mott Insulator. This new type of resistive switching has potential to build up a new class of Resistive Random Access Memory (RRAM) with fast writing/erasing times (50 ns to 10 μs) and resistance ratios ΔR/R of the order of 25% at room temperature
Enhanced Self-organized Dewetting of Ultrathin Polymer Films under
  Water-organic Solutions: Fabrication of Sub-micron Spherical Lens Arrays

Field-induced self-organized patterning in ultrathin (< 100 nm) polymer films
produces resolutions of the order of 10 {\mu}m or more because of the high
energy penalty for the surface deformations on small scales. We propose here a
very simple but versatile method to fabricate sub-micron (~100 nm) ordered and
tunable polymeric structures by self-organized room temperature dewetting of
ultrathin polystyrene films by minimizing the surface tension limitation. We
illustrate this technique by fabricating sub-micron lens arrays of tunable
curvature. This is achieved by switching to controlled room temperature
dewetting under an optimal mix of water, acetone and methyl-ethyl ketone (MEK).
Organic solvents used decrease the glass transition temperature, greatly
decrease the interfacial tension, intensify the field and increase the contact
angle/aspect ratio of the resulting tunable nano-structures, without a
concurrent solubilization of PS owing to water being the majority phase in the
outside mixture.Comment: 13 pages and 5 figure
Synthesis of size-tunable polymeric nanoparticles enabled by 3D hydrodynamic flow focusing in single-layer microchannels

A versatile microfluidic platform to synthesize NPs by nanoprecipitation using 3D hydrodynamic flow focusing isolates the precipitating precursors from channel walls, eliminating fouling of the channels. It is shown that this new method enables robust nanoprecipitation without polymer aggregation, regardless of the polymer molecular weight or precursor concentration implemented, where the size of the resulting polymeric NPs is tunable.Author Manuscript date: 2011 June 27David H. Koch (Prostate Cancer Foundation Award in Nanotherapeutics)National Institutes of Health (U.S.) (Grant CA119349)National Science Foundation (U.S.) (Graduate Research Fellowship
Interplay of resonant cavity modes with localized surface plasmons: Optical absorption properties of bragg stacks integrating gold nanoparticles

A procedure to prepare porous photonic crystal resonators containing gold nanoparticles is reported. The optical absorption of the ensemble, resulting from the excitation of the localized surface plasmon of the metallic beads, is finely tuned by a gradual shift of the cavity mode. This is achieved by infiltration of the void network with different guest compounds. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.The authors thank the Spanish Ministry of Science and Innovation for funding provided under grants MAT2008–02166 and CONSOLIDER HOPE CSD2007–00007 and Junta de Andalucía for grants FQM3579 and FQM5247. M.E.C. thanks the Junta de Andalucía for funding of his contract. L.M.L.-M. acknowledges fi nancial support from MiCInn/FEDER (MAT2010–15374) and Xunta de Galicia (09TMT011314PR).Peer Reviewe
Protection and Promotion of UV Radiation-Induced Liposome Leakage via DNA-Directed Assembly with Gold Nanoparticles

This is the peer reviewed version of the following article: Dave, N., & Liu, J. (2011). Protection and Promotion of UV Radiation-Induced Liposome Leakage via DNA-Directed Assembly with Gold Nanoparticles. Advanced Materials, 23(28), 3182–3186, which has been published in final form at https://doi.org/10.1002/adma.201101086. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.DNA-functionalized gold nanoparticles and liposomes are assembled by a linker DNA. The gold nanoparticles can either protect the liposome from UV radiation induced leakage or can promote the leakage, depending on the DNA sequence and the alignment of the particles.University of Waterloo ||
Natural Sciences and Engineering Research Council |
Immobilized biocatalysts: novel approaches and tools for binding enzymes to supports

In the last decade, new trends for enzyme attachment to solid carriers have emerged in an attempt to rationalize the classical methods for enzyme immobilization. In silico analysis is becoming a powerful tool to predict the orientation of the enzyme covalently-attached to the carrier or the protein regions involved in the adsorption to the support. Significantly, an array of algorithms has been established for the Rational Design of Immobilized Derivatives (RDID), which comprises both the protein size and the textural properties of the support. Ordered mesoporous materials open a challenging pathway to tailor immobilized enzymes with high volumetric activity and minimum lixiviation. In addition, fluorescence confocal microscopy is being successfully employed to understand the diffusional restrictions and the distribution of biomolecules within the support.Project BIO2010-20508-C04-01 from Spanish Ministry of Science and Innovation supported this research.Peer reviewe
Graphene: Piecing it together

Graphene has a multitude of striking properties that make it an exceedingly attractive material for various applications, many of which will emerge over the next decade. However, one of the most promising applications lie in exploiting its peculiar electronic properties which are governed by its electrons obeying a linear dispersion relation. This leads to the observation of half integer quantum hall effect and the absence of localization. The latter is attractive for graphene-based field effect transistors. However, if graphene is to be the material for future electronics, then significant hurdles need to be surmounted, namely, it needs to be mass produced in an economically viable manner and be of high crystalline quality with no or virtually no defects or grains boundaries. Moreover, it will need to be processable with atomic precision. Hence, the future of graphene as a material for electronic based devices will depend heavily on our ability to piece graphene together as a single crystal and define its edges with atomic precision. In this progress report, the properties of graphene that make it so attractive as a material for electronics is introduced to the reader. The focus then centers on current synthesis strategies for graphene and their weaknesses in terms of electronics applications are highlighted. The future of graphene as a material for electronic based devices will depend heavily on our ability to piece graphene together as a single crystal and define its edges with atomic precision. In this progress report, current synthesis strategies for graphene and their weaknesses in terms of electronics applications are highlighted.Peer Reviewe
Hybrid magnetic/superconducting materials obtained by insertion of a single-molecule magnet into TaS2 layers

et al.A material in which superconducting and magnetic properties coexist is synthesized by the intercalation of single-molecule magnets into the layered structure of a group V metal dichalcogenide. A molecule-based/solid-state hybrid strategy is here employed, proving as a promising chemical approach for preparing new materials in which superconductivity coexists with different molecule-intrinsic functionalities.Financial support from the EU (MolSpinQIP) and the ERC (SPINMOL Advanced Grant to EC), the Spanish Ministerio de Ciencia e Innovación (Project Consolider-Ingenio in Molecular Nanoscience and projects MAT2007-61584, MAT2009-13977-C03, and CTQ-2008-06720, co-financed by FEDER) and the Generalitat Valenciana (Prometeo Program) are gratefully acknowledged. ENM thanks the Spanish Ministerio de Ciencia e Innovación too for a FPU grant. CMG thanks the EU for a Marie Curie Fellowship (IEF-253369).Peer Reviewe
Nanomechanics of Streptavidin Hubs for Molecular Materials

A new strategy is reported for creating protein-based nanomaterials by genetically fusing large polypeptides to monomeric streptavidin and exploiting the propensity of streptavidin monomers(SM) to self-assemble into stable tetramers. We have characterized the mechanical properties of streptavidin-linked structures and measured, for the first time, the mechanical strength of streptavidin tetramers themselves. Using streptavidin tetramers as molecular hubs offers a unique opportunity to create a variety of well-defined, self-assembled protein-based (nano) materials with unusual mechanical properties
Practical Roadmap and Limits to Nanostructured Photovoltaics

The significant research interest in the engineering of photovoltaic (PV) structures at the nanoscale is directed toward enabling reductions in PV module fabrication and installation costs as well as improving cell power conversion efficiency (PCE). With the emergence of a multitude of nanostructured photovoltaic (nano-PV) device architectures, the question has arisen of where both the practical and the fundamental limits of performance reside in these new systems. Here, the former is addressed a posteriori. The specific challenges associated with improving the electrical power conversion efficiency of various nano-PV technologies are discussed and several approaches to reduce their thermal losses beyond the single bandgap limit are reviewed. Critical considerations related to the module lifetime and cost that are unique to nano-PV architectures are also addressed. The analysis suggests that a practical single-junction laboratory power conversion efficiency limit of 17% and a two-cell tandem power conversion efficiency limit of 24% are possible for nano-PVs, which, when combined with operating lifetimes of 10 to 15 years, could position them as a transformational technology for solar energy markets.Eni-MIT Alliance Solar Frontiers Program (Eni S.p.A. (Firm))National Science Foundation (U.S.). Graduate Research Fellowship ProgramLink FoundationHertz Foundation (Fellowship
Tailoring Nanostructures Using Copolymer Nanoimprint Lithography

Finding affordable ways of generating high-density ordered nanostructures
that can be transferred to a substrate is a major challenge for industrial
applications like memories or optical devices with high resolution features. In
this work, we report on a novel technique to direct self-assembled structures
of block copolymers by NanoImprint Lithography. Surface energy of a reusable
mold and nanorheology are used to organize the copolymers in defect-free
structures over tens of micrometers in size. Versatile and controlled in-plane
orientations of about 25 nm half-period lamellar nanostructures are achieved
and, in particular, include applications to circular tracks of magnetic reading
heads.Comment: 12 pages, 4 figures; Advanced Materials 201
High magneto-optical activity and low optical losses in metal-dielectric Au/Co/Au-SiO 2 magnetoplasmonic nanodisks

Metal-dielectric Au-Co-SiO 2 magnetoplasmonic nanodisks are found to exhibit large magneto-optical activity and low optical losses. The internal architecture of the nanodisks is such that, in resonant conditions, the electromagnetic field undertakes a particular spatial distribution. This makes it possible to maximize the electromagnetic field at the magneto-optically active layers and minimize it in the other, optically lossy ones. Copyright © 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim.The authors acknowledge funding support from the EU (NMP3-SL-2008- 214107-Nanomagma), the Spanish MICINN (“FUNCOAT” CONSOLIDER INGENIO 2010 CSD2008-00023, MAGPLAS MAT2008-06765-C02-01/ NAN and PLASMAR MAT2010-10123-E), and the Comunidad de Madrid (“NANOBIOMAGNET”, S2009/MAT-1726 and “MICROSERES-CM”, S2009/TIC-1476, and JAE Doc fellowship for D.M.-R.).Peer Reviewe
Linear self-assembly of nanoparticles within liquid crystal defect arrays

International audienceWe used oily streaks defects of smectic films, oriented by the underlying substrates to create chains of nano-particles of diameter 5nm, gold nano-spheres and quantum dots. Combination of Scanning Electronic Microscopy, fluorescence microscopy and micro-specto-photometry evidenced formation of straight chains of hundreds of micrometers, parallel to the oily streaks, They are constituted of single nano-particles of separation ranging from some micrometers (c'est bien cela?) to 1.5nm when the concentration is increased by ten thousands, in agreement with the most stable sites of trapping located within defects cores, not larger than 5nm. A hierarchy of trapping efficiency is demonstrated in relation with the defect nature. When concentration is further increased, single chains are thickened, but still anisotropic, thanks to the presence of trapping sites around the defccts cores. The hybrid systems with gold nano-particles are consequently optically active and the LSPR can be tuned by light polarization, in a matter controllable by the concentration of GNPs
Homoepitaxial Growth of Single Crystal Diamond Membranes for Quantum Information Processing

Fabrication of devices designed to fully harness the unique properties of quantum mechanics through their coupling to quantum bits (qubits) is a prominent goal in the field of quantum information processing (QIP). Among various qubit candidates, nitrogen vacancy (NV) centers in diamond have recently emerged as an outstanding platform for room temperature QIP. However, formidable challenges still remain in processing diamond and in the fabrication of thin diamond membranes, which are necessary for planar photonic device engineering. Here we demonstrate epitaxial growth of single crystal diamond membranes using a conventional microwave chemical vapor deposition (CVD) technique. The grown membranes, only a few hundred nanometers thick, show bright luminescence, excellent Raman signature and good NV center electronic spin coherence times. Microdisk cavities fabricated from these membranes exhibit quality factors of up to 3000, overlapping with NV center emission. Our methodology offers a scalable approach for diamond device fabrication for photonics, spintronics, optomechanics and sensing applications.Engineering and Applied Science
Tuning the Properties of ZnO, Hematite, and Ag Nanoparticles by Adjusting the Surface Charge

Nanomaterials have become a central focus of scientific research and technological development over the last decade due to their broad applications in a variety of physicochemical and biological fields, including lasers,[1] solar cells,[2] catalysts,[3] sensors,[4–6] biological labels,[7] drug delivery,[8,9] and cancer therapy.[10–13] Controlling the size and/or shape of nanoparticles (NPs) has been widely used to modify and improve NP properties for designated applications.[1,6,11,14–19] Recently, it has been found that adjusting the surface charge (SC) can be a effective method to modify the cytotoxicity, cellular uptake, and specificity of targeting of NPs.[9,10,12,20–22] Electrons and/or other electrical charges play an essential role in many key material properties, such as electrostatic interactions, photoluminescence (PL), magnetism, plasmon properties, chemical bonds, and related chemical properties
Sliding on a Nanotube: Interplay of Friction, Deformations and Structure

The frictional properties of individual carbon nanotubes (CNTs) are studied
by sliding an atomic force microscopy tip across and along its principle axis.
This direction-dependent frictional behavior is found to correlate strongly
with the presence of structural defects, surface chemistry, and CNT chirality.
This study shows that it is experimentally possible to tune the
frictional/adhesion properties of a CNT by controlling the CNT structure and
surface chemistry, as well as use friction force to predict its structural and
chemical properties.Comment: 6 pages, 3 figures, 2 table
Rectangular Symmetry Morphologies in a Topographically Templated Block Copolymer

Using an array of majority-block-functionalized posts makes it possible to locally control the self-assembly of a block copolymer and achieve several morphologies on a single substrate. A template consisting of a square symmetry array of posts produces a square-symmetry lattice of microdomains, which doubles the areal density of features.Semiconductor Research CorporationFENA CenterSemiconductor Research Corporation. Nanoscale Research InitiativeSingapore-MIT AllianceNational Science Foundation (U.S.)Taiwan Semiconductor Manufacturing CompanyTokyo Electron LimitedNational University of Singapor
Full Visible Range Covering InP/ZnS Nanocrystals with High Photometric Performance and Their Application to White Quantum Dot Light-Emitting Diodes

Cataloged from PDF version of article.High-quality InP/ZnS core–shell nanocrystals with luminescence tunable over the entire visible spectrum have been achieved by a facile one-pot solvothermal method. These nanocrystals exhibit high quantum yields (above 60%), wide emission spectrum tunability and excellent photostability. The FWHM can be as narrow as 38 nm, which is close to that of CdSe nanocrystals. Also, making use of these nanocrystals, we further demonstrated a cadmium-free white QD-LED with a high color rendering index of 91. The high-performance of the resulting InP/ZnS NCs coupled with their low intrinsic toxicity may further promote industrial applications of these NC emitters