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https://www.readbyqxmd.com/read/28327735/reverse-micelle-based-water-soluble-nanoparticles-for-simultaneous-bioimaging-and-drug-delivery
#1
Ying Chen, Yong Liu, Yongchao Yao, Shiyong Zhang, Zhongwei Gu
With special confined water pools, reverse micelles (RMs) have shown potential for a wide range of applications. However, the inherent water-insolubility of RMs hinders their further application prospects, especially for applications related to biology. We recently reported the first successful transfer of RMs from organic media to an aqueous phase without changing the smart water pools by the hydrolysis of an arm-cleavable interfacial cross-linked reverse micelles. Herein, we employed another elaborate amphiphile 1 to construct new acrylamide-based cross-linked water-soluble nanoparticles (ACW-NPs) under much gentler conditions...
March 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28326227/uptake-of-the-proteins-htra1-and-htra2-by-cells-mediated-by-calcium-phosphate-nanoparticles
#2
Olga Rotan, Katharina N Severin, Simon Pöpsel, Alexander Peetsch, Melisa Merdanovic, Michael Ehrmann, Matthias Epple
The efficient intracellular delivery of (bio)molecules into living cells remains a challenge in biomedicine. Many biomolecules and synthetic drugs are not able to cross the cell membrane, which is a problem if an intracellular mode of action is desired, for example, with a nuclear receptor. Calcium phosphate nanoparticles can serve as carriers for small and large biomolecules as well as for synthetic compounds. The nanoparticles were prepared and colloidally stabilized with either polyethyleneimine (PEI; cationic nanoparticles) or carboxymethyl cellulose (CMC; anionic nanoparticles) and loaded with defined amounts of the fluorescently labelled proteins HTRA1, HTRA2, and BSA...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28321128/continuous-wave-lasing-in-colloidal-quantum-dot-solids-enabled-by-facet-selective-epitaxy
#3
Fengjia Fan, Oleksandr Voznyy, Randy P Sabatini, Kristopher T Bicanic, Michael M Adachi, James R McBride, Kemar R Reid, Young-Shin Park, Xiyan Li, Ankit Jain, Rafael Quintero-Bermudez, Mayuran Saravanapavanantham, Min Liu, Marek Korkusinski, Pawel Hawrylak, Victor I Klimov, Sandra J Rosenthal, Sjoerd Hoogland, Edward H Sargent
Colloidal quantum dots (CQDs) feature a low degeneracy of electronic states at the band edges compared with the corresponding bulk material, as well as a narrow emission linewidth. Unfortunately for potential laser applications, this degeneracy is incompletely lifted in the valence band, spreading the hole population among several states at room temperature. This leads to increased optical gain thresholds, demanding high photoexcitation levels to achieve population inversion (more electrons in excited states than in ground states-the condition for optical gain)...
March 20, 2017: Nature
https://www.readbyqxmd.com/read/28302346/postoperative-acute-kidney-injury-and-blood-product-transfusion-after-synthetic-colloid-use-during-cardiac-surgery
#4
Rajika Tobey, Hao Cheng, Mei Gao, Zhongmin Li, J Nilas Young, W Douglas Boyd, Fuhai Ji, Hong Liu
OBJECTIVES: This study assessed the effect of 2 types of hydroxyethyl starches (HES) on renal integrity and blood transfusion in cardiac surgery patients. DESIGN: Retrospective investigation. SETTING: Patients from a single tertiary medical center. PARTICIPANTS: Inclusion criteria included coronary artery bypass graft (CABG) and/or valve surgery that included cardiopulmonary bypass with aortic cross-clamping. INTERVENTIONS: Intraoperative HES and blood product administration...
December 28, 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28282044/predatory-behaviour-in-synthetic-protocell-communities
#5
Yan Qiao, Mei Li, Richard Booth, Stephen Mann
Recent progress in the chemical construction of colloidal objects comprising integrated biomimetic functions is paving the way towards rudimentary forms of artificial cell-like entities (protocells). Although several new types of protocells are currently available, the design of synthetic protocell communities and investigation of their collective behaviour has received little attention. Here we demonstrate an artificial form of predatory behaviour in a community of protease-containing coacervate microdroplets and protein-polymer microcapsules (proteinosomes) that interact via electrostatic binding...
February 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28260380/highly-emissive-divalent-ion-doped-colloidal-cspb1-xmxbr3-perovskite-nanocrystals-through-cation-exchange
#6
Ward van der Stam, Jaco J Geuchies, Thomas Altantzis, Karel H W van den Bos, Johannes D Meeldijk, Sandra Van Aert, Sara Bals, Daniel Vanmaekelbergh, Celso de Mello Donega
Colloidal CsPbX3 (X = Br, Cl, and I) perovskite nanocrystals (NCs) have emerged as promising phosphors and solar cell materials due to their remarkable optoelectronic properties. These properties can be tailored by not only controlling the size and shape of the NCs but also postsynthetic composition tuning through topotactic anion exchange. In contrast, property control by cation exchange is still underdeveloped for colloidal CsPbX3 NCs. Here, we present a method that allows partial cation exchange in colloidal CsPbBr3 NCs, whereby Pb(2+) is exchanged for several isovalent cations, resulting in doped CsPb1-xMxBr3 NCs (M= Sn(2+), Cd(2+), and Zn(2+); 0 < x ≤ 0...
March 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28256635/insights-into-the-sonochemical-synthesis-and-properties-of-salt-free-intrinsic-plutonium-colloids
#7
Elodie Dalodière, Matthieu Virot, Vincent Morosini, Tony Chave, Thomas Dumas, Christoph Hennig, Thierry Wiss, Oliver Dieste Blanco, David K Shuh, Tolek Tyliszcak, Laurent Venault, Philippe Moisy, Sergey I Nikitenko
Fundamental knowledge on intrinsic plutonium colloids is important for the prediction of plutonium behaviour in the geosphere and in engineered systems. The first synthetic route to obtain salt-free intrinsic plutonium colloids by ultrasonic treatment of PuO2 suspensions in pure water is reported. Kinetics showed that both chemical and mechanical effects of ultrasound contribute to the mechanism of Pu colloid formation. In the first stage, fragmentation of initial PuO2 particles provides larger surface contact between cavitation bubbles and solids...
March 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28246633/flocking-ferromagnetic-colloids
#8
Andreas Kaiser, Alexey Snezhko, Igor S Aranson
Assemblages of microscopic colloidal particles exhibit fascinating collective motion when energized by electric or magnetic fields. The behaviors range from coherent vortical motion to phase separation and dynamic self-assembly. Although colloidal systems are relatively simple, understanding their collective response, especially under out-of-equilibrium conditions, remains elusive. We report on the emergence of flocking and global rotation in the system of rolling ferromagnetic microparticles energized by a vertical alternating magnetic field...
February 2017: Science Advances
https://www.readbyqxmd.com/read/28245014/colloidal-metal-oxide-nanocrystals-as-charge-transporting-layers-for-solution-processed-light-emitting-diodes-and-solar-cells
#9
REVIEW
Xiaoyong Liang, Sai Bai, Xin Wang, Xingliang Dai, Feng Gao, Baoquan Sun, Zhijun Ning, Zhizhen Ye, Yizheng Jin
Colloidal metal oxide nanocrystals offer a unique combination of excellent low-temperature solution processability, rich and tuneable optoelectronic properties and intrinsic stability, which makes them an ideal class of materials as charge transporting layers in solution-processed light-emitting diodes and solar cells. Developing new material chemistry and custom-tailoring processing and properties of charge transporting layers based on oxide nanocrystals hold the key to boosting the efficiency and lifetime of all-solution-processed light-emitting diodes and solar cells, and thereby realizing an unprecedented generation of high-performance, low-cost, large-area and flexible optoelectronic devices...
February 28, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28236692/synthesis-and-characterization-of-folate-decorated-albumin-bio-conjugate-nanoparticles-loaded-with-a-synthetic-curcumin-difluorinated-analogue
#10
Kaustubh A Gawde, Prashant Kesharwani, Samaresh Sau, Fazlul H Sarkar, Subhash Padhye, Sushil K Kashaw, Arun K Iyer
Albumin-bound paclitaxel colloidal nanoparticle (Abraxane®) is an FDA approved anticancer formulation available in the market. It is a suspension which is currently used therapeutically for treating cancers of the breast, lung, and pancreas among others. CDF is a novel new and potent synthetic curcumin analogue that is widely used for breast and ovarian cancer. The aim of this study was to use biocompatible albumin as well as folate decorated albumin to formulate colloidal nanoparticles encapsulating curcumin difluorinated (CDF)...
February 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28235364/synthesis-and-examination-of-nanocomposites-based-on-poly-2-hydroxyethyl-methacrylate-for-medicinal-use
#11
Olena S Kukolevska, Igor I Gerashchenko, Mykola V Borysenko, Evgenii M Pakhlov, Michal Machovsky, Tetyana I Yushchenko
Preparation of poly(2-hydroxyethyl methacrylate) (PHEMA) based nanocomposites using different approaches such as synthesis with water as the porogen, filling of polymer matrix by silica and formation of interpenetrating polymer networks with polyurethane was demonstrated. Incorporation of various biologically active compounds (BAC) such as metronidazole, decamethoxin, zinc sulphate, silver nitrate or amino acids glycine and tryptophan into nanocomposites was achieved. BAC were introduced into the polymer matrix either (1) directly, or (2) with a solution of colloidal silica, or (3) through immobilization on silica (sol-densil)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28231432/dismantling-the-red-wall-of-colloidal-perovskites-highly-luminescent-formamidinium-and-formamidinium-cesium-lead-iodide-nanocrystals
#12
Loredana Protesescu, Sergii Yakunin, Sudhir Kumar, Janine Bär, Federica Bertolotti, Norberto Masciocchi, Antonietta Guagliardi, Matthias Grotevent, Ivan Shorubalko, Maryna I Bodnarchuk, Chih-Jen Shih, Maksym V Kovalenko
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A=Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X=Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28230971/multifaceted-gold-palladium-bimetallic-nanorods-and-their-geometric-compositional-and-catalytic-tunabilities
#13
Lichao Sun, Qingfeng Zhang, Guangfang Grace Li, Esteban Villarreal, Xiaoqi Fu, Hui Wang
Kinetically controlled, seed-mediated coreduction provides a robust and versatile synthetic approach to multimetallic nanoparticles with precisely controlled geometries and compositions. Here we demonstrate that single-crystalline cylindrical Au nanorods selectively transform into a series of structurally distinct Au@Au-Pd alloy core-shell bimetallic nanorods with exotic multifaceted geometries enclosed by specific types of facets upon seed-mediated Au-Pd coreduction under diffusion controlled conditions. By adjusting several key synthetic parameters, such as the Pd/Au precursor ratio, the reducing agent concentration, the capping surfactant concentration, and foreign metal ion additives, we have been able to simultaneously fine-tailor the atomic-level surface structures and fine-tune the compositional stoichiometries of the multifaceted Au-Pd bimetallic nanorods...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28221007/ionic-colloidal-molding-as-a-biomimetic-scaffolding-strategy-for-uniform-bone-tissue-regeneration
#14
Jian Zhang, Jinpeng Jia, Jimin P Kim, Hong Shen, Fei Yang, Qiang Zhang, Meng Xu, Wenzhi Bi, Xing Wang, Jian Yang, Decheng Wu
Inspired by the highly ordered nanostructure of bone, nanodopant composite biomaterials are gaining special attention for their ability to guide bone tissue regeneration through structural and biological cues. However, bone malformation in orthopedic surgery is a lingering issue, partly due to the high surface energy of traditional nanoparticles contributing to aggregation and inhomogeneity. Recently, carboxyl-functionalized synthetic polymers have been shown to mimic the carboxyl-rich surface motifs of non-collagenous proteins in stabilizing hydroxyapatite and directing intrafibrillar mineralization in-vitro...
February 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28220476/response-of-trabecular-bone-thyroid-c-and-follicular-cells-to-synthetic-salmon-calcitonin-in-middle-aged-orchidectomized-male-rats
#15
Branko Filipović, Branka Šošić-Jurjević, Vladimir Ajdžanović, Jasmina Živanović, Nataša Ristić, Svetlana Trifunović, Verica Milošević
In contrast to studies in women, male osteoporosis is poorly understood and strictly related to advancing age. Among the first antiresorptive substances used in the prevention and treatment of osteoporosis is calcitonin (CT), a hypocalcemic hormone that potently inhibits osteoclastic bone resorption. Natural CT is produced and secreted by thyroid C-cells. The other endocrine population of thyroid cells produces thyroid hormones (TH), which also affect bone turnover. The aim of this study was to evaluate the influence of salmon CT on trabecular bone microarchitecture with special reference to effects on the structure and function of both CT- and TH-producing thyroid cells in orchidectomized (Orx) middle-aged rats...
February 20, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28192995/morphology-controlled-coating-of-colloidal-particles-with-silica-influence-of-particle-surface-functionalization
#16
Xu Dong, Pan Wu, Goetz P Hellmann, Changchun Wang, Christian G Schäfer
We present a general, convenient, and efficient synthetic concept for the coating of colloidal particles with a silica (SiO2) shell of well-defined and precisely controlled morphology and porosity. Monodisperse submicroscopic polystyrene (PS) particles were synthesized via two-stage emulsifier-free emulsion polymerization and subsequent swelling polymerization, enabling selective particle surface modification by the incorporation of ionic (methacrylic acid, MAA) or nonionic (hydroxyethyl methacrylate, HEMA or methacrylamide, MAAm) comonomers, which could be proven by zeta potential measurements as well as by determining the three-phase contact angle of the colloidal particles adsorbed at the air-water and n-decane-water interface...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28191964/understanding-and-curing-structural-defects-in-colloidal-gaas-nanocrystals
#17
Vishwas Srivastava, Wenyong Liu, Eric M Janke, Vladislav Kamysbayev, Alexander S Filatov, Cheng-Jun Sun, Byeongdu Lee, Tijana Rajh, Richard D Schaller, Dmitri V Talapin
GaAs is one of the most important semiconductors. However, colloidal GaAs nanocrystals remain largely unexplored because of the difficulties with their synthesis. Traditional synthetic routes either fail to produce pure GaAs phase or result in materials whose optical properties are very different from the behavior expected for quantum dots of direct-gap semiconductors. In this work, we demonstrate a variety of synthetic routes toward crystalline GaAs NCs. By using a combination of Raman, EXAFS, transient absorption, and EPR spectroscopies, we conclude that unusual optical properties of colloidal GaAs NCs can be related to the presence of Ga vacancies and lattice disorder...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28186408/functional-microgels-and-microgel-systems
#18
Felix A Plamper, Walter Richtering
Microgels are macromolecular networks swollen by the solvent in which they are dissolved. They are unique systems that are distinctly different from common colloids, such as, e.g., rigid nanoparticles, flexible macromolecules, micelles, or vesicles. The size of the microgel networks is in the range of several micrometers down to nanometers (then sometimes called "nanogels"). In a collapsed state, they might resemble hard colloids but they can still contain significant amounts of solvent. When swollen, they are soft and have a fuzzy surface with dangling chains...
February 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28185882/s-transnitrosation-reactions-of-hydrogen-sulfide-h2s-hs-s-2-with-s-nitrosated-cysteinyl-thiols-in-phosphate-buffer-of-ph-7-4-results-and%C3%A2-review-of-the-literature
#19
Dimitrios Tsikas, Anke Böhmer
Cysteine (CysSH) and its derivatives including N-acetylcysteine (NAC) and glutathione (GSH), and cysteine residues in proteins and enzymes are nitrosated with nitric oxide (NO) reaction products such as N2O3 to form S-nitrosated cysteine thiols (RCysSNO). RCysSNO undergo with cysteine thiols (RCysSH) S-transnitrosation reactions, thereby transferring reversibly their nitrosyl ((+)NO) group to RCysSH to form RCysSNO. (•)NO release from RCysSNO and S-transnitrosation are considered the most important features and signalling pathways of RCysSNO...
February 6, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28170239/synthetic-control-of-exciton-behavior-in-colloidal-quantum-dots
#20
Chaodan Pu, Haiyan Qin, Yuan Gao, Jianhai Zhou, Peng Wang, Xiaogang Peng
Colloidal quantum dots are promising optical and optoelectronic materials for various applications, whose performance is dominated by their excited-state properties. This article illustrates synthetic control of their excited states. Description of the excited states of quantum-dot emitters can be centered around exciton. We shall discuss that, different from conventional molecular emitters, ground-state structures of quantum dots are not necessarily correlated with their excited states. Synthetic control of exciton behavior heavily relies on convenient and affordable monitoring tools...
February 15, 2017: Journal of the American Chemical Society
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