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Synthetic colloid

Matthias Heringlake, Christian Schmidt, Sebastian Brandt
Patients undergoing cardiac surgery are growing older, present with more comorbidities, and are frequently scheduled for more complex and prolonged surgical procedures. Routine application of neurological as well as extended hemodynamic monitoring combined with goal-directed perioperative hemodynamic optimization, targeting optimization of systemic and cerebral oxygen balance, show promise to reduce postoperative complications and to improve mortality in this high risk population. Expert recommendations suggest to avoid synthetic colloids for fluid optimization...
May 2018: Anästhesiologie, Intensivmedizin, Notfallmedizin, Schmerztherapie: AINS
Sara Garcia-Salinas, Erico Himawan, Gracia Mendoza, Manuel Arruebo, Victor Sebastian Cabeza
The large-scale continuous production of niosomes remains challenging. The inherent drawbacks of batch processes such as large particle polydispersity and reduced batch-to-batch reproducibility are here overcome by using commercially available microfluidic reactors. Compared to the traditional batch-based film hydration method, herein, we demonstrate that it is possible to carry out the homogeneous, large-scale (up to 120mg/min) production of niosomes using two different synthesis techniques (the thin film hydration method and the emulsification technique)...
May 16, 2018: ACS Applied Materials & Interfaces
Eunsoo Yoo, Yizhong Liu, Chukwuazam A Nwasike, Sebastian R Freeman, Brian C DiPaolo, Bernardo Cordovez, Amber L Doiron
The effect of nanoparticle surface coating characteristics on colloidal stability in solution is a critical parameter in understanding the potential applications of nanoparticles, especially in biomedicine. Here we explored the modification of the surface of poly(ethylene glycol)-coated superparamagnetic iron oxide nanoparticles (PEG-SPIOs) with the synthetic pseudotannin polygallol via interpolymer complexation (IPC). Changes in particle size and zeta potential were indirectly assessed via differences between PEG-SPIOs and IPC-SPIOs in particle velocity and scattering intensity using near-field light scattering...
2018: Beilstein Journal of Nanotechnology
Dikai Zhu, Juan Hui, Nelson Rowell, Yuanyuan Liu, Queena Y Chen, Tristan Steegemans, Hongsong Fan, Meng Zhang, Kui Yu
Colloidal semiconductor magic-size clusters (MSCs), a crucial link between molecular and bulk materials, have attracted attention in the past three decades. However, the identification of their nonbandgap electronic transitions via optical absorption has been challenging due to the possible presence of other-bandgap ensembles in synthetic batches. For CdSe MSC-415, referred to as the optical absorption (1S(e)-1S3/2 (h)) in nanometers of wavelength, we report our exploration on the origin of two commonly documented absorption peaks at 381 and 351 nm...
May 15, 2018: Journal of Physical Chemistry Letters
Yang Liu, Yuanyuan Zhang, Qiangwei Kou, Yue Chen, Yantao Sun, Donglai Han, Dandan Wang, Ziyang Lu, Lei Chen, Jinghai Yang, Scott Guozhong Xing
Nowadays, synthetic organic dyes and pigments discharged from numerous industries are causing unprecedentedly severe water environmental pollution, and conventional water treatment processes are hindered due to the corresponding sophisticated aromatic structures, hydrophilic nature, and high stability against light, temperature, etc. Herein, we report an efficient fabrication strategy to develop a new type of highly efficient, low-cost, and magnetically recoverable nanocatalyst, i.e., FePt⁻Ag nanocomposites, for the reduction of methyl orange (MO) and rhodamine B (RhB), by a facile seed deposition process...
May 14, 2018: Nanomaterials
Xavier Bouju, Étienne Duguet, Fabienne Gauffre, Claude R Henry, Myrtil L Kahn, Patrice Mélinon, Serge Ravaine
Quantum strongly correlated systems that exhibit interesting features in condensed matter physics often need an unachievable temperature or pressure range in classical materials. One solution is to introduce a scaling factor, namely, the lattice parameter. Synthetic heterostructures named superlattices or supracrystals are synthesized by the assembling of colloidal atoms. These include semiconductors, metals, and insulators for the exploitation of their unique properties. Most of them are currently limited to dense packing...
May 8, 2018: Advanced Materials
Michela Barattin, Andrea Mattarei, Anna Balasso, Cristina Paradisi, Laura Cantù, Elena Del Favero, Tapani Viitala, Francesca Mastrotto, Paolo Caliceti, Stefano Salmaso
An innovative pH-switchable colloidal system that can be exploited for site-selective anticancer drug delivery has been generated by liposomes decoration with a new novel synthetic non-peptidic oligo-Arginine cell-penetration enhancer (CPE) and a quenching PEGylated counterpart that detaches from the vesicle surface under the acidic conditions of tumors. The CPE module (Arg4-DAG) is formed by four arginine units conjugated to a first generation (G1) 2,2-bis(hydroxymethyl)propionic acid (bis-MPA)/2,2-bis(aminomethyl)propionic acid (bis-AMPA) polyester dendron terminating with 1,2-distearoyl-3-azidopropane for liposome bilayer insertion...
May 8, 2018: ACS Applied Materials & Interfaces
Abhijit Bera, Debranjan Mandal, Prasenjit Nanda Goswami, Arup Kumar Rath, Bhagavatula L V Prasad
A rational synthetic method that produces monodisperse and air stable metal sulfide colloidal quantum dots (CQDs) in organic nonpolar solvents using octyl dithiocarbamic acid (C8DTCA) as a sulfur source, is reported. The high reactivity of C8DTCA in presence of primary amines towards metal complexes is exploited to achieve this purpose. This novel technique is generic and can be applied to prepare diverse CQDs, like CdS, MnS, ZnS, SnS, In2S3, including more useful and in demand PbS CQDs and plasmonic nanocrystals of Cu2S...
May 1, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Patrick Trampert, Wu Wang, Delei Chen, Raimond B G Ravelli, Tim Dahmen, Peter J Peters, Christian Kübel, Philipp Slusallek
A new method for dealing with incomplete projection sets in electron tomography is proposed. The approach is inspired by exemplar-based inpainting techniques in image processing and heuristically generates data for missing projection directions. The method has been extended to work on three dimensional data. In general, electron tomography reconstructions suffer from elongation artifacts along the beam direction. These artifacts can be seen in the corresponding Fourier domain as a missing wedge. The new method synthetically generates projections for these missing directions with the help of a dictionary based approach that is able to convey both structure and texture at the same time...
April 21, 2018: Ultramicroscopy
Soumya Bhowal, Arijit Ghosh, Srijita Paul Chowdhuri, Raju Mondal, Benu Brata Das
The present study aims to formulate a common synthetic strategy for preparing quantum dots (QDs) in a greener way by using combination of popular methods, viz. a colloidal method with suitable capping agent and low molecular weight gel based synthesis. Pyridine dicarboxylic acid (PDC) in presence of AlCl3 forms a stable metallogel, which serves as an excellent medium for selective ZnS QD synthesis. The aromatic pyridine moiety, well known for being a capping agent, indeed plays its part in the run up to QD synthesis...
April 26, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Christian Coelho, Perrine Julien, Maria Nikolantonaki, Laurence Noret, Mathilde Magne, Jordi Ballester, Régis D Gougeon
Chardonnay wines from Burgundy, obtained from musts with three levels of clarification (Low, Medium and High) during two consecutive vintages (2009 and 2010) and for two kinds of closures (screw caps and synthetic coextruded closures) were analyzed chemically and sensorially. Three bottles per turbidity level were opened in 2015 in order to assess the intensity of the reductive and/or oxidative aromas (REDOX sensory scores) by a trained sensory panel. The chemical analyses consisted in polyphenols and colloids quantification, followed by a proteomic characterization...
2018: Frontiers in Chemistry
Belén Hernández, Yves-Marie Coïc, Eduardo López-Tobar, Santiago Sanchez-Cortes, Bruno Baron, Fernando Pflüger, Sergei G Kruglik, Régis Cohen, Mahmoud Ghomi
Primarily known as the inhibitor of growth hormone release, the role of somatostatin in many other inhibiting activities upon binding to its five G-protein-coupled receptors has been elucidated. Because of the short half-life of somatostatin, a number of synthetic analogues were elaborated for this peptide hormone. Herein, after recalling the main somatostatin therapeutic interests, we present the dynamical behavior of somatostatin-14 and its two currently used synthetic cyclic analogues, octreotide and pasireotide...
2018: Advances in Protein Chemistry and Structural Biology
Kyle D Gilroy, Xuan Yang, Shuifen Xie, Ming Zhao, Dong Qin, Younan Xia
Controlling the surface structure of metal nanocrystals while maximizing the utilization efficiency of the atoms is a subject of great importance. An emerging strategy that has captured the attention of many research groups involves the conformal deposition of one metal as an ultrathin shell (typically 1-6 atomic layers) onto the surface of a seed made of another metal and covered by a set of well-defined facets. This approach forces the deposited metal to faithfully replicate the surface atomic structure of the seed while at the same time serving to minimize the usage of the deposited metal...
April 14, 2018: Advanced Materials
Christopher Melnychuk, Philippe Guyot-Sionnest
The biexciton lifetimes in HgTe colloidal quantum dots are measured as a function of particle size. Samples produced by two synthetic methods, leading to partially aggregated or well-dispersed particles, exhibit markedly different dynamics. The relaxation characteristics of partially aggregated HgTe inhibit reliable determinations of the Auger lifetime. In well-dispersed HgTe quantum dots, the biexciton lifetime increases approximately linearly with particle volume, confirming trends observed in other systems...
April 12, 2018: Journal of Physical Chemistry Letters
William Edwards, Nicolas Marro, Grace Turner, Euan R Kay
Surface chemical composition is fundamental to determining properties on the nanoscale, making precise control over surface chemistry critical to being able to optimise nanomaterials for virtually any application. Surface-engineering independent of the preparation of the underlying nanomaterial is particularly attractive for efficient, divergent synthetic strategies, and for the potential to create reactive, responsive and smart nanodevices. For monolayer-stabilised nanoparticles, established methods include ligand exchange to replace the ligand shell in its entirety, encapsulation with amphiphilic (macro)molecules, noncovalent interactions with surface-bound biomolecules, or a relatively limited number of covalent bond forming reactions...
January 7, 2018: Chemical Science
Bo Peng, Xinglin Zhang, Dirk G A L Aarts, Roel P A Dullens
Recent progress in synthetic nanotechnology and the ancient use of metals in food preservation and the antibacterial treatment of wounds have prompted the development of nanometallic materials for antimicrobial applications1-4 . However, the materials designed so far do not simultaneously display antimicrobial activity and the capability of binding and capturing bacteria and spores. Here, we develop a one-step pyrolysis procedure to synthesize monodisperse superparamagnetic nickel colloidal nanocrystal clusters (SNCNCs), which show both antibacterial activity and the ability to bind Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli) bacteria, as well as bacterial spores...
April 2, 2018: Nature Nanotechnology
Stefano Sacanna, Theodore Hueckel
Increasing significance is being placed on the synthesis of smart colloidal particles, since the route to various meta-materials has been outlined through their bottom-up self-assembly. Unfortunately, making particles with well-defined shape and surface chemistry often requires considerable effort and time, and as such, are available only in restrictive yields. Here we report a synthetic methodology, which we refer to as mix- and-melt reactions (MMR), that allows for rapid prototyping and mass-production of anisotropic core-shell colloids...
April 2, 2018: ACS Nano
Li-Ting Chen, Ung-Hsuan Liao, Je-Wei Chang, Shih-Yuan Lu, De-Hao Tsai
A gas-phase controlled synthetic approach is demonstrated to fabricate Ag-ZnO hybrid nanostructure as a high-performance catalyst for photo-degradation of water pollutants. The degradation of rhodamine B (RhB) was used as representative, which were tested and evaluated with respect to the environmental pH and the presence of dodecyl sulfate corona on the surface of catalyst. The results show that a raspberry-structure Ag-ZnO hybrid nanoparticle cluster was successfully synthesized via gas-phase evaporation-induced self-assembly...
April 1, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Bob Jin Kwon, Patrick J Phillips, Baris Key, Fulya Dogan, John W Freeland, Chunjoong Kim, Robert F Klie, Jordi Cabana
Stabilization of electrode-electrolyte interfaces is required to increase the energy stored in battery electrodes. Introducing redox-inactive ions on the electrode surface minimizes deleterious side reactions without affecting the bulk properties. A synthetic challenge exists to grow such layers conformally at each primary particle, to fully passivate interfaces that are buried in the final electrode architecture. The development of methods of sequential colloidal growth of complex oxides and overlayers, enabled by surfactant interactions, would provide novel means to advance toward this goal...
March 29, 2018: Nanoscale
Rosalinda Yasato Camargo, Cristina Takami Kanamura, Celso Ubirajara Friguglietti, Célia Regina Nogueira, Sonia Iorcansky, Alfio José Tincani, Ana Karina Bezerra, Ester Brust, Fernanda Christtanini Koyama, Anamaria Aranha Camargo, Fernanda Orpinelli R Rego, Pedro Alexandre Favoretto Galante, Geraldo Medeiros-Neto, Ileana Gabriela Sanchez Rubio
Ectopic thyroid results from a migration defect of the developing gland during embryogenesis causing congenital hypothyroidism. But it has also been detected in asymptomatic individuals. This study aimed to investigate the histopathological, functional, and genetic features of human ectopic thyroids. Six samples were histologically examined, and the expression of the specific thyroid proteins was assessed by immunohistochemistry. Two samples were submitted to whole exome sequencing. An oropharynx sample showed immature fetal architecture tissue with clusters or cords of oval thyrocytes and small follicles; one sample exhibited a normal thyroid pattern while four showed colloid goiter...
2018: International Journal of Endocrinology
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