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https://www.readbyqxmd.com/read/28937677/synthesis-and-materialization-of-a-reaction-diffusion-french-flag-pattern
#1
Anton S Zadorin, Yannick Rondelez, Guillaume Gines, Vadim Dilhas, Georg Urtel, Adrian Zambrano, Jean-Christophe Galas, André Estevez-Torres
During embryo development, patterns of protein concentration appear in response to morphogen gradients. These patterns provide spatial and chemical information that directs the fate of the underlying cells. Here, we emulate this process within non-living matter and demonstrate the autonomous structuration of a synthetic material. First, we use DNA-based reaction networks to synthesize a French flag, an archetypal pattern composed of three chemically distinct zones with sharp borders whose synthetic analogue has remained elusive...
October 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28929101/current-trends-in-volume-replacement-therapy-and-the-use-of-synthetic-colloids-in-small-animals-an-internet-based-survey-2016
#2
Ivayla D Yozova, Judith Howard, Nadja E Sigrist, Katja-Nicole Adamik
The use of synthetic colloids (SCs), particularly hydroxyethyl starch (HES), in people has changed in recent years following new evidence raising concerns about their efficacy and safety. Although fluid therapy guidelines for small animals are often extrapolated from human medicine, little information exists on current practice in veterinary medicine. The objective of the present study was to investigate current fluid selection, use of plasma volume expanders including SCs, and recent changes in their use in small animal practice...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28922664/patchy-particles-made-by-colloidal-fusion
#3
Zhe Gong, Theodore Hueckel, Gi-Ra Yi, Stefano Sacanna
Patches on the surfaces of colloidal particles provide directional information that enables the self-assembly of the particles into higher-order structures. Although computational tools can make quantitative predictions and can generate design rules that link the patch motif of a particle to its internal microstructure and to the emergent properties of the self-assembled materials, the experimental realization of model systems of particles with surface patches (or 'patchy' particles) remains a challenge. Synthetic patchy colloidal particles are often poor geometric approximations of the digital building blocks used in simulations and can only rarely be manufactured in sufficiently high yields to be routinely used as experimental model systems...
September 18, 2017: Nature
https://www.readbyqxmd.com/read/28920080/lead-halide-perovskite-nanocrystals-in-the-research-spotlight-stability-and-defect-tolerance
#4
REVIEW
He Huang, Maryna I Bodnarchuk, Stephen V Kershaw, Maksym V Kovalenko, Andrey L Rogach
This Perspective outlines basic structural and optical properties of lead halide perovskite colloidal nanocrystals, highlighting differences and similarities between them and conventional II-VI and III-V semiconductor quantum dots. A detailed insight into two important issues inherent to lead halide perovskite nanocrystals then follows, namely, the advantages of defect tolerance and the necessity to improve their stability in environmental conditions. The defect tolerance of lead halide perovskites offers an impetus to search for similar attributes in other related heavy metal-free compounds...
September 8, 2017: ACS Energy Letters
https://www.readbyqxmd.com/read/28917533/nanoparticles-of-a-polyaspartamide-based-brush-copolymer-for-modified-release-of-sorafenib-in-vitro-and-in-vivo-evaluation
#5
Melchiorre Cervello, Giovanna Pitarresi, Antonella Bavuso Volpe, Barbara Porsio, Daniele Balasus, Maria Rita Emma, Antonina Azzolina, Roberto Puleio, Guido Ruggero Loria, Stefano Puleo, Gaetano Giammona
In this paper, we describe the preparation of polymeric nanoparticles (NPs) loaded with sorafenib for the treatment of hepatocellular carcinoma (HCC). A synthetic brush copolymer, named PHEA-BIB-ButMA (PBB), was synthesized by Atom Trasnfer Radical Polymerization (ATRP) starting from the α-poly(N-2-hydroxyethyl)-d,l-aspartamide (PHEA) and poly butyl methacrylate (ButMA). Empty and sorafenib loaded PBB NPs were, then, produced by using a dialysis method and showed spherical morphology, colloidal size, negative ζ potential and the ability to allow a sustained sorafenib release in physiological environment...
September 14, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28910074/highly-luminescent-phase-stable-cspbi3-perovskite-quantum-dots-achieving-near-100-absolute-photoluminescence-quantum-yield
#6
Feng Liu, Yaohong Zhang, Chao Ding, Syuusuke Kobayashi, Takuya Izuishi, Naoki Nakazawa, Taro Toyoda, Takeshi Ohta, Shuzi Hayase, Takashi Minemoto, Kenji Yoshino, Songyuan Dai, Qing Shen
Perovskite quantum dots (QDs) as a new type of colloidal nanocrystals have gained significant attention for both fundamental research and commercial applications owing to their appealing optoelectronic properties and excellent chemical processability. For their wide range of potential applications, synthesizing colloidal QDs with high crystal quality is of crucial importance. However, like most common QD systems such as CdSe and PbS, those reported perovskite QDs still suffer from a certain density of trapping defects, giving rise to detrimental non-radiative recombination centers and thus quenching luminescence...
September 14, 2017: ACS Nano
https://www.readbyqxmd.com/read/28902979/core-shell-nanoparticle-clusters-enable-synergistic-integration-of-plasmonic-and-catalytic-functions-in-a-single-platform
#7
Seunghoon Lee, Younghyun Wy, Young Wook Lee, Kyungrok Ham, Sang Woo Han
Designing controlled hybrid nanoarchitectures between plasmonic and catalytic materials is of paramount importance to fully exploit each function of constituent materials. This study reports a new synthetic strategy for the realization of colloidal clusters of core-shell nanoparticles with plasmonic cores and catalytically active shells. The Au@M (M = Pd or Pt) nanoparticle clusters (NPCs) with a high density of sub-1 nm interparticle gaps are successfully prepared by the deposition of M shells onto thermally activated Au NPCs...
September 13, 2017: Small
https://www.readbyqxmd.com/read/28899089/highly-active-multimetallic-palladium-nanoalloys-embedded-in-conducting-polymer-as-anode-catalyst-for-electrooxidation-of-ethanol
#8
Srabanti Ghosh, Susmita Bera, Sandip Bysakh, Rajendra Nath Basu
Fabrication of multimetallic nanocatalysts with controllable composition remains a challenge for the development of low-cost electrocatalysts, and incorporating metal-based catalysts into active carbon nanoarchitectures represents an emerging strategy to improve the catalytic performance of electrocatalysts. Herein, a facile method developed for Pd nanoparticle (NP)-based multimetallic alloys incorporated on polypyrrole (Ppy) nanofibers by in situ nucleation and growth of NPs using colloidal radiolytic technique is described...
September 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28891569/improved-catalytic-activity-of-mo1-xwxse2-alloy-nanoflowers-promotes-efficient-hydrogen-evolution-reaction-in-both-acidic-and-alkaline-aqueous-solutions
#9
Oren E Meiron, Vasu Kuraganti, Idan Hod, Ronen Bar-Ziv, Maya Bar-Sadan
Layered transition metal dichalcogenides are noble-metal free electrocatalysts for the hydrogen evolution reaction (HER). Instead of using the common hydrothermal synthesis, which requires high pressure and temperature, herein a relatively simple and controlled colloidal synthesis was used to produce an alloy of Mo1-xWxSe2 with nanoflower morphology as a model system for the electrocatalysis of hydrogen evolution in both acidic and alkaline environments. The results show that Mo1-xWxSe2 alloys exhibit better catalytic activity in both acidic and alkaline solutions with low overpotentials compared to pure MoSe2 and WSe2...
September 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28891562/quantitative-surface-enhanced-raman-spectroscopy-of-single-bases-in-oligodeoxynucleotides
#10
S Dick, S E J Bell
To address the question of whether the SERS signals of ss-DNA are simply combinations of the signals from the individual bases that comprise the sequence, SERS spectra of unmodified ss-DNA sequences were obtained using a hydroxylamine-reduced Ag colloid aggregated with MgSO4. Initially, synthetic oligodeoxynucleotides with systematic structural variations were used to investigate the effect of adding single nucleobases to the 3' terminus of 10-mer and 20-mer sequences. It was found that the resulting SERS difference spectra could be used to identify the added nucleobases since they closely matched reference spectra of the same nucleobase...
September 11, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28885633/colloidal-nanoparticle-size-control-experimental-and-kinetic-modeling-investigation-of-the-ligand-metal-binding-role-in-controlling-the-nucleation-and-growth-kinetics
#11
Saeed Mozaffari, Wenhui Li, Coogan Thompson, Sergei Ivanov, Soenke Seifert, Byeongdu Lee, Libor Kovarik, Ayman M Karim
Despite the major advancements in colloidal metal nanoparticles synthesis, a quantitative mechanistic treatment of the ligand's role in controlling their size remains elusive. We report a methodology that combines in situ small angle X-ray scattering (SAXS) and kinetic modeling to quantitatively capture the role of ligand-metal binding (with the metal precursor and the nanoparticle surface) in controlling the synthesis kinetics. We demonstrate that accurate extraction of the kinetic rate constants requires using both, the size and number of particles obtained from in situ SAXS to decouple the contributions of particle nucleation and growth to the total metal reduction...
September 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28876072/binary-colloidal-crystal-films-grown-by-vertical-evaporation-of-silica-nanoparticle-suspensions
#12
Jennifer L Russell, Grace H Noel, Joseph M Warren, Ngoc-Lan L Tran, Thomas E Mallouk
Despite intensive research efforts in the synthesis of binary colloidal crystals, the production of well ordered binary colloidal crystal films over large areas continues to be synthetically challenging. In this paper, we investigate the phase behavior of binary mixtures of L-arginine-stabilized 36 nm and 22 nm silica nanoparticles deposited as centimeter-scale thin films onto a vertical substrate via evaporative assembly. By adjusting the temperature and relative colloid composition under high humidity conditions, we controlled the order of the resultant colloidal crystal films...
September 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28867687/rapid-exacerbation-of-renal-function-after-administration-of-hydroxyethyl-starch-in-a-dog
#13
Junwoo Bae, Mahmoud Soliman, Hyunwoo Kim, Seongwoo Kang, Woosun Kim, Soomin Ahn, Kyoungoh Cho, Jihye Choi, Suhee Kim, Jinho Park, Sangki Kim, Yoonjung DO, Jaegyu Yoo, Dohyeon Yu
Hydroxyethyl starches (HES) are commonly used synthetic colloidal solution in veterinary medicine. Despite of possible adverse effect to kidney injury in human, there is no report about nephrotoxic effects of HES in dogs. HES was administered to a Golden retriever (4-year-old, intact male) with ascites in order to increase plasma osmolality. Initially, the dog was mild azotemic, however, kidney function was rapidly deteriorated after several days of HES administration. Finally, histopathological examination revealed remarkable osmotic nephrosis...
September 2, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28866195/polyglycerol-mediated-covalent-construction-of-magnetic-mesoporous-silica-nanohybrid-with-aqueous-dispersibility-for-drug-delivery
#14
Xiaoxin Yang, Yu Wen, Anqing Wu, Meiyun Xu, Tsukuru Amano, Luyi Zheng, Li Zhao
Construction of nanohybrids with chemical and colloidal stability is of great importance for the exploration of their potential applications in biomedical field. In this work, a versatile strategy based on polyglycerol (PG) mediated covalent linkage is developed to fabricate a core-satellite nanohybrid, termed MMSN, consisting of a mesoporous silica nanoparticle (MSN) as a core and many superparamagnetic iron oxide nanoparticles (SPION) on the outer surface. In this synthetic strategy, the PG grafted SPION is derivatized to convert partial periphery hydroxyl groups to carboxyl moieties, followed by attachment to aminated MSN through amide bonds...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28857563/structure-and-dynamics-of-nonionic-surfactant-aggregates-in-layered-materials
#15
Régis Guégan, Emmanuel Veron, Lydie Le Forestier, Makoto Ogawa, Sylvian Cadars
The aggregation of surfactants on solid surfaces as they are adsorbed from solution is the basis of numerous technological applications such as colloidal stabilization, ore flotation, and floor cleaning. The understanding of both the structure and the dynamics of surfactant aggregates applies to the development of alternative ways of preparing hybrid layered materials. For this purpose, we study the adsorption of the triethylene glycol mono n-decyl ether (C10E3) nonionic surfactant onto a synthetic montmorillonite (Mt), an aluminosilicate clay mineral for organoclay preparation with important applications in materials sciences, catalysis, wastewater treatment, or as drug delivery...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28857437/ii3-v2-ii-zn-cd-v-p-as-semiconductors-from-bulk-solids-to-colloidal-nanocrystals
#16
REVIEW
Benjamin A Glassy, Brandi M Cossairt
II3 V2 semiconductors have become increasingly popular for a variety of applications including solar light harvesting, near-IR imaging, and low energy light detection. The bulk physical and electronic structure of these materials is highlighted, followed by an in-depth survey on progress in synthesizing these semiconductors as colloidal nanocrystals. Interestingly, no universal synthetic approach has yet been developed to access all compounds within this family. A discussion on how the complex crystal structure of these materials translates to small domain sizes will highlight current challenges in the characterization of II3 V2 nanocrystals...
August 30, 2017: Small
https://www.readbyqxmd.com/read/28852056/electronic-properties-of-sb-bi-2te3-colloidal-heterostructured-nanoplates-down-to-the-single-particle-level
#17
Wasim J Mir, Alexandre Assouline, Clément Livache, Bertille Martinez, Nicolas Goubet, Xiang Zhen Xu, Gilles Patriarche, Sandrine Ithurria, Hervé Aubin, Emmanuel Lhuillier
We investigate the potential use of colloidal nanoplates of Sb2Te3 by conducting transport on single particle with in mind their potential use as 3D topological insulator material. We develop a synthetic procedure for the growth of plates with large lateral extension and probe their infrared optical and transport properties. These two properties are used as probe for the determination of the bulk carrier density and agree on a value in the 2-3 × 10(19) cm(-3) range. Such value is compatible with the metallic side of the Mott criterion which is also confirmed by the weak thermal dependence of the conductance...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28835124/in-vitro-and-in-vivo-characteristics-of-biogenic-high-surface-silica-nanoparticles-in-a549-lung-cancer-cell-lines-and-danio-rerio-model-systems-for-inorganic-biomaterials-development
#18
Suriyaprabha Rangaraj, Rajendran Venkatachalam
Silica based organic-inorganic hybrids are turned over the most necessitate biomaterial due to their exotic biomedical properties. Colloidal silica nanoparticles (SNPs) of high surface area are synthesized from the bamboo wastes (leave biomass) as a viable and promising alternative to synthetic silica sol through alkaline extraction process. Physico-chemical properties of the prepared silica powders are examined employing extensive characterization tools. The characteristic results of the silica sol demonstrate amorphous particles (average size: 25 nm) with relatively high surface area (428 m(2) g(-1)) and spherical morphology...
August 24, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28805658/nanofibrous-photocatalysts-from-electrospun-nanocapsules
#19
Shuai Jiang, Ingo Lieberwirth, Katharina Landfester, Rafael Muñoz-Espí, Daniel Crespy
We present the design of multicompartment metal oxide/silica nanofibrous photocatalysts by colloid-electrospinning and subsequent calcination. During the calcination process, silica nanomaterials are cemented to form the fibrous framework and metal oxide precursors are crystallized inside and onto the fibers. This multicompartment nanofibrous structure, constructed with nanoparticles and core-shell nanocapsules, is therefore beneficial for the separation of the materials and the light utilization due to the multiple reflections and scattering of incident light in the cavities...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28800226/systematic-identification-of-promoters-for-methane-oxidation-catalysts-using-size-and-composition-controlled-pd-based-bimetallic-nanocrystals
#20
Joshua J Willis, Emmett D Goodman, Liheng Wu, Andrew R Riscoe, Pedro Martins, Christopher J Tassone, Matteo Cargnello
Promoters enhance the performance of catalytic active phases by increasing rates, stability, and/or selectivity. The process of identifying promoters is in most cases empirical and relies on testing a broad range of catalysts prepared with the random deposition of active and promoter phases, typically with no fine control over their localization. This issue is particularly relevant in supported bimetallic systems, where two metals are codeposited onto high-surface area materials. We here report the use of colloidal bimetallic nanocrystals to produce catalysts where the active and promoter phases are colocalized to a fine extent...
August 21, 2017: Journal of the American Chemical Society
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