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https://www.readbyqxmd.com/read/28813610/poloxamer-decorated-polymer-nanoparticles-for-lung-surfactant-compatibility
#1
Moritz Beck-Broichsitter, Adam Bohr, Christian Arnold Ruge
Lung-delivered polymer nanoparticles provoked dysfunction of the essential lung surfactant system. A steric shielding of the nanoparticle surface with poloxamers could minimize the unwanted interference of polymer nanoparticles with the biophysical function of lung surfactant. The extent of poly(styrene) and poly(lactide) nanoparticle-induced lung surfactant inhibition could be related to the type and content of the applied poloxamer. Escalations of the adsorbed coating layer thickness (>3 nm) as well as concentration (brush- rather than mushroom-like conformation of poly(ethylene glycol), chain-to-chain distance of <5 nm) on the colloidal surface were capable of circumventing bioadverse effects...
August 16, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28813063/tuning-mass-transport-in-magnetic-nanoparticle-filled-viscoelastic-hydrogels-using-low-frequency-rotating-magnetic-fields
#2
Shahab Boroun, Faïçal Larachi
This study investigates the response of magnetic nanoparticles (MNPs), dispersed in a viscoelastic hydrogel, to an external rotating magnetic field (RMF) for the purpose of developing a new class of magneto-responsive materials with tunable mass transport properties. Ferrogels were prepared by chemical cross-linking and polymerization of acrylamide in colloidal dispersions of thermally blocked MNPs of cobalt ferrite. Magnetization measurements of ferrogels in a swollen state revealed a transitional state from ferromagnetism to superparamagnetism through the shrinkage of hysteresis loops and the reduction of remanent magnetization...
August 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/28809978/phase-separation-dynamics-of-polydisperse-colloids-a-mean-field-lattice-gas-theory
#3
Pablo de Castro, Peter Sollich
New insights into phase separation in colloidal suspensions are provided via a dynamical theory based on the polydisperse lattice-gas model. The model gives a simplified description of polydisperse colloids, incorporating a hard-core repulsion combined with polydispersity in the strength of the attraction between neighbouring particles. Our mean-field equations describe the local concentration evolution for each of an arbitrary number of species, and for an arbitrary overall composition of the system. We focus on the predictions for the dynamics of colloidal gas-liquid phase separation after a quench into the coexistence region...
August 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28808432/grazing-incidence-small-angle-neutron-scattering-from-structures-below-an-interface
#4
Shirin Nouhi, Maja S Hellsing, Vassilios Kapaklis, Adrian R Rennie
Changes of scattering are observed as the grazing angle of incidence of an incoming beam increases and probes different depths in samples. A model has been developed to describe the observed intensity in grazing-incidence small-angle neutron scattering (GISANS) experiments. This includes the significant effects of instrument resolution, the sample transmission, which depends on both absorption and scattering, and the sample structure. The calculations are tested with self-organized structures of two colloidal samples with different size particles that were measured on two different instruments...
August 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28808265/study-of-dynamical-heterogeneities-in-colloidal-nanoclay-suspensions-approaching-dynamical-arrest
#5
Paramesh Gadige, Debasish Saha, Sanjay Kumar Behera, Ranjini Bandyopadhyay
The dynamics of aqueous Laponite clay suspensions slow down with increasing sample waiting time (t w ). This behavior, and the material fragility that results, closely resemble the dynamical slowdown in fragile supercooled liquids with decreasing temperature, and are typically ascribed to the increasing sizes of distinct dynamical heterogeneities in the sample. In this article, we characterize the dynamical heterogeneities in Laponite suspensions by invoking the three-point dynamic susceptibility formalism...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807819/carrier-characteristics-influence-the-kinetics-of-passive-drug-loading-into-lipid-nanoemulsions
#6
Katrin Göke, Heike Bunjes
Passive loading as a novel screening approach is a material-saving tool for the efficient selection of a suitable colloidal lipid carrier system for poorly water soluble drug candidates. This method comprises incubation of preformed carrier systems with drug powder and subsequent determination of the resulting drug load of the carrier particles after removal of excess drug. For reliable routine use and to obtain meaningful loading results, information on the kinetics of the process is required. Passive loading proceeds via a dissolution-diffusion based mechanism, where drug surface area and drug water solubility are key parameters for fast passive loading...
August 11, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28806515/redox-triggered-coloration-mechanism-of-electrically-tunable-colloidal-photonic-crystals
#7
Ho-Sung Yang, Jinhyeok Jang, Byoung-Sun Lee, Tae-Hyung Kang, Jong-Jin Park, Woong-Ryeol Yu
Electrically tunable colloidal photonic crystals (ETPCs) have been researched due to several merits such as easy color tunability, no discoloration, and high brightness. The coloration mechanism of ETPCs has been explained by only the electric field. Herein, we report on a new mechanism: electric field plus redox reaction. Imposing electrically conductive or insulated conditions on the electrodes of ETPCs, the coloration behavior of ETPCs was investigated using current-voltage, cyclic voltammetry and zeta potential measurements, as well as scanning electron microscopy...
August 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28806511/understanding-and-reducing-photo-thermal-forces-for-the-fabrication-of-au-nanoparticle-dimers-by-optical-printing
#8
Julian Gargiulo, Thomas Brick, Ianina L Violi, Facundo C Herrera, Toshihiko Shibanuma, Pablo Albella, Emiliano Cortes, Felix G Requejo, Stefan A Maier, Fernando D Stefani
Optical printing holds great potential to enable the use of the vast variety of colloidal nanoparticles (NPs) in nano- and micro- devices and circuits. By means of optical forces, it enables the direct assembly of NPs, one by one, onto specific positions of solid surfaces with great flexibility of pattern design and no need of previous surface patterning. However, for unclear causes it was not possible to print NPs closer to each other than 300 nm. Here, we show that the repulsion restricting the optical printing of close by NPs arises from light absorption by the printed NPs and consequent local heating...
August 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28806065/synthesis-characterization-and-selective-delivery-of-darpin-gold-nanoparticle-conjugates-to-cancer-cells
#9
Sergey Deyev, Galina Proshkina, Anastasiya Ryabova, Francesco Tavanti, Maria Cristina Menziani, Gennady Eidelshtein, Gabriel Avishai, Alexander B Kotlyar
We demonstrate that the designed ankyril repeat protein (DARPin) _9-29, which specifically targets human epidermal growth factor receptor 2 (HER 2), binds tightly to gold nanoparticles (GNPs). Binding of the protein strongly increases the colloidal stability of the particles. The results of experimental analysis and molecular dynamics simulations show that approximately 35 DARPin _9-29 molecules are bound to the surface of a 5 nm GNP and that the binding does not involve the receptor-binding domain of the protein...
August 14, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28805878/interfacial-entropy-driven-thermophoretic-tweezers
#10
Linhan Lin, Xiaolei Peng, Zhangming Mao, Xiaoling Wei, Chong Xie, Yuebing Zheng
Directed migration of particles and molecules in a temperature gradient field, which is known as thermophoresis or the Soret effect, is of fundamental importance for mass transfer in colloid science and life sciences. However, thermophoretic tweezers that enable versatile particle manipulation have remained elusive due to the complex underlying physical forces in thermophoresis and the lack of general thermophilic particles above room temperature. Herein, we exploit entropic response and permittivity gradient at the particle-solvent interface to optically generated thermal gradient to achieve the thermophoretic trapping and dynamic manipulation of charged particles over an optothermal-responsive substrate...
August 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28805875/frequency-selective-electrokinetic-enrichment-of-biomolecules-in-physiological-media-based-on-electrical-double-layer-polarization
#11
Ali Rohani, Bankim J Sanghavi, Armita Salahi, Kuo-Tang Liao, Chia-Fu Chou, Nathan S Swami
Proteomic biomarkers of interest to the early diagnosis of diseases and infections are present at trace levels versus interfering species. Hence, their selective enrichment is needed within bio-assays for speeding binding kinetics with receptors and for reducing signal interferences. While DC fields can separate biomolecules based on their electrokinetic mobilities, they are unable to selectively enrich biomarkers versus interfering species, which may possess like-charges. We present the utilization of AC electrokinetics to enable frequency-selective enrichment of nanocolloidal biomolecules, based on the characteristic time constant for polarization of their electrical double-layer, since surface conduction in their ion cloud depends on colloidal size, shape and surface charge...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28805823/bronze-mean-hexagonal-quasicrystal
#12
Tomonari Dotera, Shinichi Bekku, Primož Ziherl
The most striking feature of conventional quasicrystals is their non-traditional symmetry characterized by icosahedral, dodecagonal, decagonal or octagonal axes. The symmetry and the aperiodicity of these materials stem from an irrational ratio of two or more length scales controlling their structure, the best-known examples being the Penrose and the Ammann-Beenker tiling as two-dimensional models related to the golden and the silver mean, respectively. Surprisingly, no other metallic-mean tilings have been discovered so far...
August 14, 2017: Nature Materials
https://www.readbyqxmd.com/read/28805713/polyaspartamide-based-nanoparticles-loaded-with-fluticasone-propionate-and-the-in-vitro-evaluation-towards-cigarette-smoke-effects
#13
Emanuela Fabiola Craparo, Maria Ferraro, Elisabetta Pace, Maria Luisa Bondì, Gaetano Giammona, Gennara Cavallaro
This paper describes the evaluation of polymeric nanoparticles (NPs) as a potential carrier for lung administration of fluticasone propionate (FP). The chosen polymeric material to produce NPs was a copolymer based on α,β-poly(N-2-hydroxyethyl)-d,l-aspartamide (PHEA) whose backbone was derivatised with different molecules, such as poly(lactic acid) (PLA) and polyethylenglycol (PEG). The chosen method to produce NPs from PHEA-PLA-PEG2000 was the method based on high-pressure homogenization and subsequent solvent evaporation by adding Pluronic F68 during the process and trehalose before lyophilisation...
August 13, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28805658/nanofibrous-photocatalysts-from-electrospun-nanocapsules
#14
Shuai Jiang, Ingo Lieberwirth, Katharina Landfester, Rafael Munoz-Espi, 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/28805212/heterogeneous-interface-adsorption-of-colloidal-particles
#15
Dong Woo Kang, Jin Hyun Lim, Bum Jun Park
The heterogeneous adsorption behaviors of charged colloidal particles to oil-water interfaces were quantitatively and statistically investigated. Using optical laser tweezers, the particles in a sessile water drop formed in an oil phase were laterally translated toward the slope of the oil-water interface and their attachment to the interface was attempted. The adsorption probability was found to logarithmically decrease as the ionic strength decreased and to depend on the holding time during which an optically trapped particle was held at the position closest to the interface...
August 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/28803628/dominique-langevin-festschrift-four-decades-opening-gates-in-colloid-and-interface-science
#16
EDITORIAL
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No abstract text is available yet for this article.
August 5, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28803273/transport-and-transformation-of-mercury-during-wet-flue-gas-cleaning-process-of-nonferrous-metal-smelting
#17
Zhilou Liu, Dongli Wang, Bing Peng, Liyuan Chai, Hui Liu, Shu Yang, Bentao Yang, Kaisong Xiang, Cao Liu
Reducing mercury emission is hot topic for international society. The first step for controlling mercury in fuel gas is to investigate mercury distribution and during the flue gas treatment process. The mercury transport and transformation in wet flue gas cleaning process of nonferrous smelting industry was studied in the paper with critical important parameters, such as the solution temperature, Hg(0) concentration, SO2 concentration, and Hg(2+) concentration at the laboratory scale. The mass ratio of the mercury distribution in the solution, flue gas, sludge, and acid fog from the simulated flue gas containing Hg(2+) and Hg(0) was 49...
August 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803000/interaction-of-niobium-with-iron-oxide-colloids-and-the-role-of-humic-acid
#18
Madhusudan Ghosh, K K Swain, Rakesh Verma
In this work, we report the sorption of Nb on iron oxides and the effect of humic acid. Iron oxides viz. goethite, hematite and magnetite were chemically synthesised and characterised by X-ray diffraction, particle size, surface area and zeta potential measurement. The sorption of Nb on all the three iron oxides was low (∼40%) at pH 1, increased to ∼ 90% at pH 8 and decreased marginally above pH 8. The effect of humic acid on the sorption was very small. Thermodynamic parameters viz. activation energy, enthalpy, entropy, free energy and sticking probability were calculated to understand the mechanism of the sorption process...
August 10, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28801955/single-layer-centrifugation-of-fresh-dromedary-camel-semen-improves-sperm-quality-and-in-vitro-fertilization-capacity-compared-with-simple-sperm-washing
#19
C Malo, E G Crichton, J M Morrell, B S Pukazhenthi, J A Skidmore
Single layer centrifugation (SLC) through a colloid is a tool for selecting viable mammalian spermatozoa but has not been used previously for fresh dromedary camel sperm. Semen from six camels (2 ejaculates/male) was diluted 1:5 (v:v) or 1:10 (v:v) in a Tris-citrate-fructose buffer for mechanical liquefaction by gentle pipetting. Following liquefaction, semen was processed either by SLC or by centrifugation without a colloid (control). Total and progressive motilities, CASA kinematics, vitality and acrosome integrity (eosin-nigrosin) and plasma membrane integrity (Hypo-osmotic swelling test; HOST), and fertilizing ability in a heterologous assay (zona-free goat oocytes) were evaluated...
August 12, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28801679/improvement-of-a-rapid-diagnostic-application-of-monoclonal-antibodies-against-avian-influenza-h7-subtype-virus-using-europium-nanoparticles
#20
Seon-Ju Yeo, Duong Tuan Bao, Ga-Eun Seo, Cuc Thi Bui, Do Thi Hoang Kim, Nguyen Thi Viet Anh, Trinh Thi Thuy Tien, Nguyen Thi Phuong Linh, Hae-Jin Sohn, Chom-Kyu Chong, Ho-Joon Shin, Hyun Park
The development of a sensitive and rapid diagnostic test is needed for early detection of avian influenza (AI) H7 subtype. In this study, novel monoclonal antibodies (mAbs) against influenza A H7N9 recombinant hemagglutinin (rHA)1 were developed and applied to a Europium nanoparticle-based rapid fluorescent immunochromatographic strip test (FICT) to improve the sensitivity of the rapid diagnostic system. Two antibodies (2F4 and 6D7) exhibited H7 subtype specificity in a dot-FICT assay by optimization of the conjugate and the pH of the lysis buffer...
August 11, 2017: Scientific Reports
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