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Synthetic colloid

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https://www.readbyqxmd.com/read/28534401/physical-and-oxidative-stability-of-flaxseed-oil-in-water-emulsions-fabricated-from-sunflower-lecithins-impact-of-blending-lecithins-with-different-phospholipid-profiles
#1
Li Liang, Fang Chen, Xing-Guo Wang, Qingzhe Jin, Eric A Decker, David Julian McClements
There is great interest in the formulation of plant-based foods enriched with nutrients that promote health, such as polyunsaturated fatty acids. This study evaluated the impact of sunflower phospholipid type on the formation and stability of flaxseed oil-in-water emulsions. Two sunflower lecithins (Sunlipon 50 and 90) with different phosphatidylcholine (PC) levels (59 and 90%, respectively) were used in varying ratios to form emulsions. Emulsion droplet size, charge, appearance, microstructure, and oxidation were measured during storage at 55 C in the dark...
May 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28527520/recent-advances-in-smart-biotechnology-hydrogels-and-nanocarriers-for-tailored-bioactive-molecules-depot
#2
REVIEW
Gesmi Milcovich, Stefania Lettieri, Filipe E Antunes, Bruno Medronho, Ana C Fonseca, Jorge F J Coelho, Paolo Marizza, Francesca Perrone, Rossella Farra, Barbara Dapas, Gabriele Grassi, Mario Grassi, Silvia Giordani
Over the past ten years, the global biopharmaceutical market has remarkably grown, with ten over the top twenty worldwide high performance medical treatment sales being biologics. Thus, biotech R&D (research and development) sector is becoming a key leading branch, with expanding revenues. Biotechnology offers considerable advantages compared to traditional therapeutic approaches, such as reducing side effects, specific treatments, higher patient compliance and therefore more effective treatments leading to lower healthcare costs...
May 9, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28525710/mercury-telluride-quantum-dot-based-phototransistor-enabling-high-sensitivity-room-temperature-photodetection-at-2000-nanometers
#3
Mengyu Chen, Haipeng Lu, Nema M Abdelazim, Ye Zhu, Zhen Wang, Wei Ren, Stephen V Kershaw, Andrey L Rogach, Ni Zhao
Near-to-Mid infrared photodetection technologies could be widely deployed to advance the infrastructures of surveillance, environmental monitoring and manufacturing, if the detection devices would be low-cost, in compact format and with high performance. For such application requirements, colloidal quantum dot (QD) based photodetectors stand out as particularly promising due to the solution processability and ease of integration with silicon technologies; unfortunately, the detectivity of the QD photodetectors towards longer wavelengths has so far been low...
May 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28520407/controlling-configurational-isomerism-in-three-component-colloidal-hybrid-nanoparticles
#4
James M Hodges, Raymond E Schaak
Colloidal hybrid nanoparticles are solution-dispersible constructs that join together multiple distinct nanoscale materials through direct solid-solid interfaces. Given their multifunctionality and synergistic properties that emerge from interfacial coupling, hybrid nanoparticles are of interest for applications in biomedical imaging, solar energy conversion, heterogeneous catalysis, nanophotonics, and beyond. High-order hybrid nanoparticles, which incorporate three or more nanocrystal domains, offer greater tunability and functional diversity relative to one or two-component nanoparticles...
May 18, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28516400/sytematic-investigation-of-the-role-of-surfactant-composition-and-choice-of-oil-design-of-a-nanoemulsion-based-adjuvant-inducing-concomitant-humoral-and-cd4-t-cell-responses
#5
Signe Tandrup Schmidt, Malene Aaby Neustrup, Stine Harloff-Helleberg, Karen Smith Korsholm, Thomas Rades, Peter Andersen, Dennis Christensen, Camilla Foged
PURPOSE: Induction of cell-mediated immune (CMI) responses is crucial for vaccine-mediated protection against difficult vaccine targets, e.g., Chlamydia trachomatis (Ct). Adjuvants are included in subunit vaccines to potentiate immune responses, but many marketed adjuvants stimulate predominantly humoral immune responses. Therefore, there is an unmet medical need for new adjuvants, which potentiate humoral and CMI responses. The purpose was to design an oil-in-water nanoemulsion adjuvant containing a synthetic CMI-inducing mycobacterial monomycoloyl glycerol (MMG) analogue to concomitantly induce humoral and CMI responses...
May 17, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28513636/modular-synthesis-of-self-assembling-janus-dendrimers-and-facile-preparation-of-drug-loaded-dendrimersomes
#6
Sami Nummelin, Markus Selin, Sacha Legrand, Jarmo Ropponen, Jani Seitsonen, Antti Nykänen, Jari Koivisto, Jouni Hirvonen, Mauri A Kostiainen, Luis M Bimbo
Materials and methods aimed at the next generation of nanoscale carriers for drugs and other therapeutics are currently in great demand. Yet, creating these precise molecular arrangements in a feasible and straightforward manner represents a remarkable challenge. Herein we report a modular synthetic route for amphiphilic Janus-dendrimers via a copper-catalyzed click reaction (CuAAC) and a facile procedure, using simple injection, to obtain highly uniform dendrimersomes with efficient loading of the model drug compound propranolol...
May 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28508649/colloidal-synthesis-of-te-doped-bi-nanoparticles-low-temperature-charge-transport-and-thermoelectric-properties
#7
Da Hwi Gu, Seungki Jo, Hyewon Jeong, Hyeong Woo Ban, Sung Hoon Park, Seung Hwae Heo, Fredrick Kim, Jeong In Jang, Ji Eun Lee, Jae Sung Son
Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles under the quantum confinement regime is very challenging using conventional processes owing to the difficulty in synthesis. Herein, we report the colloidal chemical synthesis of sub-10 nm-sized Te-doped Bi nanoparticles with precisely controlled Te content from 0% to 5% and systematically investigate their low-temperature charge transport and thermoelectric properties...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28500653/blood-transfusion-in-the-surgical-treatment-of-adolescent-idiopathic-scoliosis-a-single-center-experience-of-patient-blood-management-in-210-cases
#8
Søren Ohrt-Nissen, Naeem Bukhari, Casper Dragsted, Martin Gehrchen, Pär I Johansson, Jesper Dirks, Jakob Stensballe, Benny Dahl
BACKGROUND: The surgical treatment of adolescent idiopathic scoliosis can be associated with substantial blood loss, requiring allogeneic red blood cell (RBC) transfusion. This study describes the use of RBC and the effect of a standardized perioperative patient blood management program. STUDY DESIGN AND METHODS: Patients treated with posterior instrumented fusion were consecutively enrolled over a 6-year period. Patient blood management strategies were implemented in 2011, including prophylactic tranexamic acid, intraoperative permissive hypotension, restrictive fluid therapy (including avoidance of synthetic colloids), restrictive RBC trigger according to institutional standardized protocol, the use of cell savage, and goal-directed therapy according to thrombelastography...
May 12, 2017: Transfusion
https://www.readbyqxmd.com/read/28497975/adjuvants-based-on-synthetic-mycobacterial-cord-factor-analogues-biophysical-properties-of-neat-glycolipids-and-nano-self-assemblies-with-dda
#9
Rie S Kallerup, Henrik Franzyk, Mikkel L Schiøth, Sarah Justesen, Birte Martin-Bertelsen, Fabrice Rose, Cecilie M Madsen, Dennis Christensen, Karen S Korsholm, Anan Yaghmur, Camilla Foged
Synthetic mycobacterial cord factor analogues, e.g., trehalose 6,6'-dibehenate (TDB), are highly promising adjuvants due to their strong immunopotentiating capabilities, but their biophysical properties have remained poorly characterized. Here, we report the synthesis of an array of synthetic TDB analogues varying in acyl chain length, degree of acylation and headgroup display, which was subjected to biophysical characterization of neat non-dispersed self-assembled nanostructures in excess buffer and as aqueous dispersions with cationic dimethyldioctadecylammonium (DDA) bromide...
May 12, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28485967/quantifying-angular-correlations-between-the-atomic-lattice-and-superlattice-of-nanocrystals-assembled-with-directional-linking
#10
Ivan Zaluzhnyy, Ruslan P Kurta, Alexander André, Oleg Gorobtsov, Max Rose, Petr Skopintsev, Ilya Besedin, Alexey V Zozulya, Michael Sprung, Frank Schreiber, Ivan A Vartanyants, Marcus Scheele
We show that the combination of X-ray scattering with a nanofocused beam and X-ray cross correlation analysis is an efficient means for the full structural characterization of mesocrystalline nanoparticle assemblies with a single experiment. We analyze several hundred diffraction patterns of individual sample locations, i.e. individual grains, to obtain a meaningful statistical distribution of the superlattice and atomic lattice ordering. Simultaneous small- and wide-angle X-ray scattering of the same sample location allows us to determine the structure and orientation of the superlattice as well as the angular correlation of the first two Bragg peaks of the atomic lattices, their orientation with respect to the superlattice, and the average orientational misfit due to local structural disorder...
May 9, 2017: Nano Letters
https://www.readbyqxmd.com/read/28481516/chemical-synthesis-doping-and-transformation-of-magic-sized-semiconductor-alloy-nanoclusters
#11
Jiwoong Yang, Franziska Muckel, Woonhyuk Baek, Rachel Fainblat, Hogeun Chang, Gerd Bacher, Taeghwan Hyeon
Nanoclusters are important prenucleation intermediates for colloidal nanocrystal synthesis. In addition, they exhibit many intriguing properties originating from their extremely small size lying between molecules and typical nanocrystals. However, synthetic control of multicomponent semiconductor nanoclusters remains a daunting goal. Here, we report on the synthesis, doping, and transformation of multielement magic-sized clusters, generating the smallest semiconductor alloys. We use Lewis acid-base reactions at room temperature to synthesize alloy clusters containing three or four types of atoms...
May 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28476616/preparation-of-liposomes-containing-small-gold-nanoparticles-using-electrostatic-interactions
#12
Gennaro A Dichello, Takahiro Fukuda, Toru Maekawa, Raymond L D Whitby, Sergey V Mikhalovsky, Mohammed Alavijeh, Ananth S Pannala, Dipak K Sarker
The development of liposome-nanoparticle colloid systems offers a versatile approach towards the manufacture of multifunctional therapeutic platforms. A strategy to encapsulate small metallic nanoparticles (<4nm) within multilamellar vesicles, effected by exploiting electrostatic interactions was investigated. Two liposome-gold nanoparticle (lipo-GNP) systems were prepared by the reverse-phase evaporation method employing cationic or anionic surface functionalised particles in combination with oppositely charged lipid compositions with subsequent post-formulation PEGylation...
May 3, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28451194/modulating-the-phases-of-iron-carbide-nanoparticles-from-a-perspective-of-interfering-with-the-carbon-penetration-of-fe-fe3o4-by-selectively-adsorbed-halide-ions
#13
Ziyu Yang, Tianshan Zhao, Xiaoxiao Huang, Xin Chu, Tianyu Tang, Yanmin Ju, Qian Wang, Yanglong Hou, Song Gao
Iron carbide nanoparticles (ICNPs) are considered to have great potential in new energy conversion, nanomagnets and biomedical applications due to their intrinsically peculiar magnetic and catalytic properties. However, the synthetic routes were greatly limited in morphology and phase controlled synthesis. In this article, we present a versatile solution chemistry route towards colloidal ICNPs (Fe2C-hexagonal and monoclinic syngony, Fe5C2-monoclinic syngony and Fe3C-orthorhombic syngony) derived from body centered cubic Fe@Fe3O4 by introducing heteroatoms to restrain their phase transformation...
January 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28451189/depletion-sphere-explaining-the-number-of-ag-islands-on-au-nanoparticles
#14
Yuhua Feng, Yawen Wang, Xiaohui Song, Shuangxi Xing, Hongyu Chen
We report multi-site nucleation and growth of Ag islands on colloidal Au nanoparticles. By modifying a single factor, a range of products from Janus nanoparticles to satellite nanostructures are obtained. The identification of these key factors reveals the correlation between the concentration gradient and the choice of nucleation sites. In contrast to the inhibited homogeneous nucleation in the bulk solution, we argue that the non-steady-state concentration gradient plays a critical role in inhibiting nucleation within nanometer distance during the initial stage of growth-an essential but not yet recognized factor in colloidal synthesis...
January 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28448140/essentially-trap-free-cspbbr3-colloidal-nanocrystals-by-postsynthetic-thiocyanate-surface-treatment
#15
Brent A Koscher, Joseph K Swabeck, Noah D Bronstein, A Paul Alivisatos
We demonstrate postsynthetic modification of CsPbBr3 nanocrystals by a thiocyanate salt treatment. This treatment improves the quantum yield of both freshly synthesized (PLQY ≈ 90%) and aged nanocrystals (PLQY ≈ 70%) to within measurement error (2-3%) of unity, while simultaneously maintaining the shape, size, and colloidal stability. Additionally, the luminescence decay kinetics transform from multiexponential decays typical of nanocrystalline semiconductors with a distribution of trap sites, to a monoexponential decay, typical of single energy level emitters...
May 4, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28443845/passive-and-active-colloidal-chemotaxis-in-a-microfluidic-channel-mesoscopic-and-stochastic-models
#16
Laurens Deprez, Pierre de Buyl
Chemotaxis is the response of a particle to a gradient in the chemical composition of the environment. While it was originally observed for biological organisms, it is of great interest in the context of synthetic active particles such as nanomotors. Experimental demonstration of chemotaxis for chemically-powered colloidal nanomotors was reported in the literature in the context of chemo-attraction in a still fluid or in a microfluidic channel where the gradient is sustained by a specific inlet geometry. In this work, we use mesoscopic particle-based simulations of the colloid and solvent to demonstrate chemotaxis in a microfluidic channel...
April 26, 2017: Soft Matter
https://www.readbyqxmd.com/read/28439986/coordinated-membrane-fusion-of-proteinosomes-by-contact-induced-hydrogel-self-healing
#17
Ping Wen, Xiaoman Liu, Lei Wang, Mei Li, Yudong Huang, Xin Huang, Stephen Mann
Controlled membrane fusion of proteinosome-based protocells is achieved via a hydrogel-mediated process involving dynamic covalent binding, self-healing, and membrane reconfiguration at the contact interface. The rate of proteinosome fusion is dependent on dynamic Schiff base covalent interchange, and is accelerated in the presence of encapsulated glucose oxidase and glucose, or inhibited with cinnamyl aldehyde due to enzyme-mediated decreases in pH or competitive covalent binding, respectively. The coordinated fusion of the proteinosomes leads to the concomitant transportation and redistribution of entrapped payloads such as DNA and dextran...
April 25, 2017: Small
https://www.readbyqxmd.com/read/28433884/synthetic-control-of-the-size-shape-and-polydispersity-of-anisotropic-silica-colloids
#18
Ryan P Murphy, Kunlun Hong, Norman J Wagner
The microstructure and rheological properties of colloidal suspensions depend on particle size and shape. This work aims to further control the size, shape, and polydispersity of anisotropic silica colloids, to reduce particle size, and to provide additional mechanistic insights on a prevalent, water-in-oil emulsion synthesis method. Key findings show that the dimensions of anisotropic silica particles can be systematically varied by approximately fivefold, with a limiting minimum particle size (D≈60nm, L≈300nm) obtained from emulsions with excess polyvinylpyrrolidone (PVP) and sodium citrate...
April 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28405662/assembly-of-hard-spheres-in-a-cylinder-a-computational-and-experimental-study
#19
Lin Fu, Ce Bian, C Wyatt Shields, Daniela F Cruz, Gabriel P López, Patrick Charbonneau
Hard spheres are an important benchmark of our understanding of natural and synthetic systems. In this work, colloidal experiments and Monte Carlo simulations examine the equilibrium and out-of-equilibrium assembly of hard spheres of diameter σ within cylinders of diameter σ≤D≤ 2.82σ. Although phase transitions formally do not exist in such systems, marked structural crossovers can nonetheless be observed. Over this range of D, we find in simulations that structural crossovers echo the structural changes in the sequence of densest packings...
May 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/28403228/refining-particle-positions-using-circular-symmetry
#20
Alvaro Rodriguez, Hanqing Zhang, Krister Wiklund, Tomas Brodin, Jonatan Klaminder, Patrik Andersson, Magnus Andersson
Particle and object tracking is gaining attention in industrial applications and is commonly applied in: colloidal, biophysical, ecological, and micro-fluidic research. Reliable tracking information is heavily dependent on the system under study and algorithms that correctly determine particle position between images. However, in a real environmental context with the presence of noise including particular or dissolved matter in water, and low and fluctuating light conditions, many algorithms fail to obtain reliable information...
2017: PloS One
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