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Core shell

Vincenzo Guarino, Rosaria Altobelli, Tania Caputo, Luigi Ambrosio, Sergio Caserta, Paola Calcagnile, Christian Demitri
In recent years, different processing technologies have been engineered to fabricate capsules or particles with peculiar properties (e.g., swelling, pH-sensitive response) at the micro and sub-micrometric size scale, to be used as carriers for controlled drug and molecular release. Herein, the development of cellulose acetate (CA) micro-carriers with mono- (MC) or bi-phasic (BC) composition is proposed, fabricated via electrohydrodynamic atomization (EHDA)-an electro-dropping technology able to micro-size polymer solution by the application of high voltage electrostatic forces...
February 18, 2019: Pharmaceutics
Nafiseh Jannasari, Milad Fathi, Seyed Jamal Moshtaghian, Alireza Abbaspourrad
Vitamin D plays a significant role in human health and preventing diseases such as heart, immune system, and infectious problems. In this study encapsulation of vitamin D by complex coacervation with a carbohydrate (cress seed mucilage, CSM) and a protein (gelatin) was investigated. Production conditions were optimized based on ratio of core to shell, pH and CSM to gelatin volume ratio. The results showed that both the ratio of core to shell and the mucilage to gelatin ratio had significant effects (p < 0...
February 16, 2019: International Journal of Biological Macromolecules
Stian Solheim, Samantha A Hutchinson, Elsa Lundanes, Steven R Wilson, James L Thorne, Hanne Roberg-Larsen
Oxysterols can contribute to proliferation of breast cancer through activation of the Estrogen Receptors, and to metastasis through activation of the Liver X Receptors. Endogenous levels of both esterified and free sidechain-hydroxylated oxysterols were examined in breast cancer tumours from Estrogen Receptor positive and negative breast tumours, using a novel fast liquid chromatography tandem mass spectrometry method. Multiple aliquots of five milligram samples of 22 tumours were analysed for oxysterol content to assess intra- and inter-tumour variation...
February 16, 2019: Journal of Steroid Biochemistry and Molecular Biology
Shan-Shan Zhang, Fahri Alkan, Hai-Feng Su, Christine M Aikens, Chen-Ho Tung, Di Sun
The elaborate selection of the capping ligands is of great importance in the synthesis of atomically precise metal nanoclusters. Organic thiolates, alkynyls, phosphines and/or their combinations are the ligands most widely utilized to protect metal nanoclusters, while inorganic oxo anions have been almost neglected in this field. Herein, the first CrO42-/tBuC≡C- co-capped Ag48 nanocluster (SD/Ag48, SD = SunDi) was synthesized and structurally characterized by single-crystal X-ray diffraction (SCXRD). The pseudo-fivefold symmetric metal skeleton of SD/Ag48 shows a core-shell structure comprised of an Ag23 cylin-der encircled by an outer Ag25 shell...
February 19, 2019: Journal of the American Chemical Society
Tae Gwang Yun, Minkyu Park, Dong-Ha Kim, Donghyuk Kim, Jun Young Cheong, Jin Gook Bae, Seung Min Han, Il-Doo Kim
Flexible-stretchable electrochromic-supercapacitor systems are widely considered as a promising multi-functional energy storage device that eliminates the need for an external power source. Nevertheless, the performance of conventional designs deteriorates significantly as a result of electrode/electrolyte exposure to atmosphere as well as mechanical deformations for the case of flexible systems. In this study, we suggest an all transparent-stretchable electrochromic-supercapacitor device with ultrastable performance, which is consisted of the Au/Ag core-shell nanowire embedded polydimethylsiloxane (PDMS), bi-stacked WO3 nanotube/PEDOT:PSS, and polyacrylamide (PAAm) based hydrogel electrolyte...
February 19, 2019: ACS Nano
Silvia Corongiu, Christian Dessì, Cristina Cadoni
Epidemiological studies have shown that people who begin experimenting drugs of abuse during adolescence are more likely to develop substance use disorders, and the earliest is the beginning of their use, the greatest is the likelihood to become dependent. Understanding the neurobiological changes increasing adolescent vulnerability to drug use is becoming imperative. Although all neurotransmitter systems undergo relevant developmental changes, dopamine system is of particular interest, given its role in a variety of functions related to reward, motivation, and decision making...
February 18, 2019: Addiction Biology
Hong Zhu, Saraf Nawar, Jörg G Werner, Jinrun Liu, Gaoshan Huang, Yongfeng Mei, David A Weitz, Alexander Aleksandrovic Solovev
Methacrylic anhydride-derived hydrogel microcapsules have unique properties, including reversibly tunable permeation, purification, and separation of dissolved molecular species. Endowing these dynamic encapsulant systems with autonomous motion will significantly enhance their efficiency and applicability. Here, hydrogel micromotors are realized using complex water-in-oil-in-water double emulsion drops and oil-in-water emulsion drops from glass capillary microfluidics and subsequent photopolymerization. Three hydrogel micromotor strategies are explored: microcapsules with thin shells and liquid cores with dispersed catalytic Pt nanoparticles, as well as water-cored microcapsules and homogeneous microparticles selectively coated with Ti/Pt catalytic layers...
February 19, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Matt Brubaker, Kristen Genter, Alexana Roshko, Paul Blanchard, Bryan Spann, Todd Harvey, Kris Bertness
Ultraviolet light-emitting diodes (UV LEDs) fabricated from N-polar AlGaN/GaN core-shell nanowires with p-i-n structure produced electroluminescence at 365 nm with ~5x higher intensities than similar GaN homojunction LEDs. The improved characteristics were attributed to localization of spontaneous recombination to the nanowire core, reduction of carrier overflow losses through the nanowire shell, and elimination of current shunting. Poisson-drift-diffusion modeling indicated that a shell Al mole fraction of x=0...
February 18, 2019: Nanotechnology
Abdullah Özkan, Necip Atar, Mehmet Lütfi Yola
An effective SPR nanosensor based on core-shell nanoparticles (Ag@AuNPs) incorporated hexagonal boron nitride (HBN) nanosheets and molecularly imprinted polymer (MIP) was presented for etoposide (ETO) detection. Scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD) method, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), fourier transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM) methods were utilized for all characterizations of nanomaterials and polymer surfaces...
January 31, 2019: Biosensors & Bioelectronics
David M Kingsley, Cassandra L Roberge, Alena Rudkouskaya, Denzel E Faulkner, Margarida Barroso, Xavier Intes, David T Corr
3D multicellular aggregates, and more advanced organotypic systems, have become central tools in recent years to study a wide variety of complex biological processes. Most notably, these model systems have become mainstream within oncology (multicellular tumor spheroids) and regenerative medicine (embryoid bodies) research. However, the biological behavior of these in vitro tissue surrogates is extremely sensitive to their aggregate size and geometry. Indeed, both of these geometrical parameters are key in producing pathophysiological gradients responsible for cellular and structural heterogeneity, replicating in vivo observations...
February 15, 2019: Acta Biomaterialia
Soumita Maiti, Nitish Singh, Animangsu Ghatak
Reversible alteration between different emulsion morphologies like core-shell and Janus is conventionally triggered by altering the interfacial energy between different phases. In contrast, here we show that the morphology of dispersed droplets can change also when the emulsion is sufficiently confined between two parallel plates. In particular we use three immiscible phases: silicone oil, paraffin oil and aqueous solution of surface active agents like Agarose, SDS, AOT, CTAB to generate oil in water emulsion consisting of complex morphologies of the dispersed droplets...
February 18, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Ali Rahimian, Christian Siltanen, Hamid Feyzizarnagh, Patricio Escalante, Alexander Revzin
Cytokines are produced by leukocytes in blood and may be used as indicators of malignancies or infections. The objective of this study was to develop a strategy for immunosensing cytokines in whole, unprocessed human blood. Microfluidic droplet generation was employed to fabricate ∼400 μm diameter microcapsules with a hydrogel shell and an aqueous core containing sensing microbeads. The hydrogel shell was composed of poly(ethylene glycol) forming a thin (∼10 μm) immunoisolation layer protecting antibody-modified microbeads inside the capsule from immune cells on the outside...
February 18, 2019: ACS Sensors
Muhammad Salman Abbasi, Ryungeun Song, Hyoungsoo Kim, Jinkee Lee
We investigate the hydrodynamic deformation and breakup of double emulsion droplets under a uniform DC electric field. Based on comprehensive experiments, we observe four different breakup modes for the double emulsion droplet by varying the viscosity of shell liquid, and conductivity, permittivity or volume fraction of the core liquid. The breakup modes are classified as a unidirectional breakup mode, two different bidirectional breakup modes, and a tip-streaming breakup mode. We performed scaling analysis and numerical simulation to explain the experimental observations...
February 18, 2019: Soft Matter
Ali Reza Sardarian, Milad Kazemnejadi, Mohsen Esmaeilpour
New Fe3O4@SiO2 core-shell superparamagnetic nanoparticles functionalized by a bis-salophen Schiff base Pd complex were synthesized and employed as an efficient magnetic nanocatalyst in the Heck and Sonogashira cross coupling reactions. The synthesized nanostructures were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic light scattering (DLS), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), elemental analysis (CHN), cyclic voltammetry (CV), Brunauer-Emmett-Teller analysis (BET), and UV-vis spectroscopy...
February 18, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Ryan H Manso, Prashant Acharya, Shiqing Deng, Cameron C Crane, Benjamin Reinhart, Sungsik Lee, Xiao Tong, Dmytro Nykypanchuk, Jing Zhu, Yimei Zhu, Lauren F Greenlee, Jingyi Chen
Controlling the 3-D morphology of nanocatalysts is one of the underexplored but important approaches for improving the sluggish kinetics of the oxygen evolution reaction (OER) in water electrolysis. This work reports a scalable, oil-based method based on thermal decomposition of organometallic complexes to yield highly uniform Ni-Fe-based nanocatalysts with a well-defined morphology (i.e. Ni-Fe core-shell, Ni/Fe alloy, and Fe-Ni core-shell). Transmission electron microscopy reveals their morphology and composition to be NiOx-FeOx/NiOx core-mixed shell, NiOx/FeOx alloy, and FeOx-NiOx core-shell...
February 18, 2019: Nanoscale
Yang Yang, Wanfen Pu, Xingguang Xu, Bing Wei, Colin D Wood
This proof-of-concept study demonstrates a facile and scalable 'dry water' method for producing micrometer-sized microgel particles by use of 'water-in-air' droplets as micro-reactors. Solid microgel particles could be easily produced by this method with no further purification. The microgel particles comprise of porous hydrophobic shells and hydrophilic cores and could absorb both oil and water. The swelling of the particles could be triggered by a surfactant under a wide range of conditions.
February 18, 2019: Chemical Communications: Chem Comm
Ankush K Dhawan, Jeffery W Seyler, Brian C Bohrer
The need for new and impactful materials to address the global problem of water pollution continues to be driving force in chemical research. This report presents the preparation of a core-double shell composite consisting of sand base substrate onto which sequential layers of chitosan and graphene oxide (GO) are deposited. The adsorption characteristics of this material for Pb (II) from aqueous solutions is investigated. Specifically, different initial lead concentrations are allowed to reach equilibrium with the chitosan-graphene oxide composites, after which the remaining abundance of lead in the aqueous phase is analyzed by atomic emission spectrometry...
January 2019: Heliyon
Hui Liu, Caiqin Wang, Peixi Wang, Nan Liu, Qingfeng Du
Extremely stable and biocompatible 3D magnetically responsive photonic crystals (MRPCs) are successfully prepared in aqueous solution. Classic hydrothermal synthesis was applied for preparation of the Fe3 O4 @C core. Modified Stöber method was then employed for synthesis of the different size of Fe3 O4 @C@SiO2 . Unlike the traditional magnetic nanoparticles, the highly negative charged superparamagnetic nanospheres (SMNs), i.e., the double-shell structure Fe3 O4 @C@SiO2 are capable of rapidly self-assembling into 3D MRPCs with full visible and various colors that can be periodically and reversibly tuned under different kinds of external magnetic fields (EMFs) within 1 s...
2019: Frontiers in Chemistry
L M Wingen, B J Finlayson-Pitts
Both ambient and laboratory-generated particles can have a surface composition different from the bulk, but there are currently few analytical techniques available to probe these differences. Easy ambient sonic-spray ionization mass spectrometry (EASI-MS) was applied to solid, laboratory-generated particles with core-shell morphologies formed from a variety of dicarboxylic acids. The soft ionization facilitated parent peak detection for the two compounds, from which the depth probed could be determined from the relative signal intensities...
January 21, 2019: Chemical Science
Zijun Wang, Andries Meijerink
Despite considerable effort to improve upconversion (UC) in lanthanide-doped nanocrystals (NCs), the maximum reported efficiencies remain below 10%. Recently, we reported on low Er3+ - and Yb3+ -doped NaYF4 NCs giving insight into fundamental processes involved in quenching for isolated ions. In practice, high dopant concentrations are required and there is a trend toward bright UC in highly doped NCs. Here, additional quenching processes due to energy transfer and migration add to a reduction in UC efficiency...
November 15, 2018: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
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