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Pieterjan Merckx, Lynn De Backer, Lien Van Hoecke, Roberta Guagliardo, Mercedes Echaide, Pieter Baatsen, Bárbara Olmeda, Xavier Saelens, Jésus Pérez-Gil, Stefaan C De Smedt, Koen Raemdonck
Despite the many advantages of small interfering RNA (siRNA) inhalation therapy and a growing prevalence for respiratory pathologies, its clinical translation is severely hampered by inefficient intracellular delivery. To this end, we previously developed hybrid nanoparticles consisting of an siRNA-loaded nanosized hydrogel core (nanogel) coated with Curosurf® , a clinically used pulmonary surfactant (PS). Interestingly, the PS shell was shown to markedly improve particle stability as well as intracellular siRNA delivery in vitro and in vivo...
August 14, 2018: Acta Biomaterialia
Deng-Guang Yu, Jiao-Jiao Li, Gareth R Williams, Min Zhao
The development of oral dosage forms for poorly water-soluble active pharmaceutical ingredients (APIs) is a persistent challenge. A range of methods has been explored to address this issue, and amorphous solid dispersions (ASDs) have received increasing attention. ASDs are typically prepared by starting with a liquid precursor (a solution or melt) and applying energy for solidification. Many techniques can be used, with the emergence of electrospinning as a potent option in recent years. This method uses electrical energy to induce changes from liquid to solid...
August 14, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Hengpan Yang, Hanwen Zhang, Yu Wu, Liangdong Fan, XiaoYan Chai, QianLing Zhang, Jianhong Liu, Chuanxin He
Numerous catalysts have been successfully introduced into CO2 fixation in aqueous or organic systems. However, one single catalyst owning both activities is still rarely seen, to the best of our knowledge. In this report, we develop a core-shell structured AgNWs/NC700 composite using Ag nanowires core encapsulated by nitrogen-doped carbon shell. Through contrast experiments and DFT calculations, it was confirmed that Ag nanowires worked as the active sites for CO2 fixation and the uniformly coating of nitrogen-doped carbon created a CO2-rich environment around Ag nanowires, which could significantly improve the catalytic activity of Ag nanowires for electrochemical CO2 fixation...
August 17, 2018: ChemSusChem
Kyungmi Kim, Hyeok-Chan Kwon, Sunihl Ma, Eunsong Lee, Seong-Cheol Yoon, Gyumin Jang, Hyunha Yang, Jooho Moon
Organic-inorganic hybrid perovskite solar cells (PSCs) have recently attracted tremendous attention due to their excellent efficiency and the advantage of a low-cost fabrication process. As a transparent electrode for PSCs, the application of copper nanowire (CuNW)-network was limited due to its thermal/chemical instability, despite its advantages in terms of high optical/electrical properties and low-cost production. Here, the copper-nickel core-shell nanowire (Cu@Ni NW)-based composite electrode is proposed as a bottom window electrode for PSCs, without the involvement of a high-cost precious metal and vacuum process...
August 17, 2018: ACS Applied Materials & Interfaces
Masada Tzabari, Amit Lerner, David Iluz, Carynelisa Haspel
The influence of internal inhomogeneities within hydrosol particles on the polarization characteristics of light is investigated by combining an accurate coated sphere (core-shell) single-scattering model with a radiative transfer model that employs Stokes formalism and considers refraction of direct solar radiation at the air-water interface followed by single scattering. A Junge particle size distribution is assumed. Variations in what we call the "linear polarization phase function" (the degree of linear polarization as a function of scattering angle and the E-vector orientation as a function of scattering angle) are examined as a function of variations in the characteristics of the hydrosol particles...
July 10, 2018: Applied Optics
Xi Xu, Chaojiang Li, Jiahao Gwendolyn Lim, Yanqing Wang, Aaron Ong, Xinwei Li, Erwin Peng, Jun Ding
Recently, 3d metal phosphide and metal-phosphorus alloy have been intensively studied for oxygen evolution reaction (OER). Research work has indicated that the presence of phosphorus could lead in formation of a phosphide/ (hydro)-oxide core/shell structure. In this work, we have developed a fabrication technique for a robust NiOOH @ amorphous Ni-P bilayer on a zirconia mesh support through a collaboration of electroless deposition and robocasting. During the electroless deposition, fully amorphous structure can be obtained with a relatively low phosphorus content (7 wt...
August 17, 2018: ACS Applied Materials & Interfaces
Bianca Pérez, Andrea Coletta, Jannik N Pedersen, Steen V Petersen, Xavier Periole, Jan Skov Pedersen, Richard B Sessions, Zheng Guo, Adam Perriman, Birgit Schiøtt
Bioconjugates established between anionic polyethylene glycol (PEG) based polymers and cationic proteins have proven to be a promising strategy to engineer thermostable biocatalysts. However, the enzyme activity of these bioconjugates is very low and the mechanism of non-covalent PEG-stabilization is yet to be understood. This work presents experimental and molecular dynamics simulation studies, using lipase-polymer surfactant nanoconjugates from mesophile Rhizomucor miehei (RML), performed to evaluate the effect of PEG on enzyme stability and activity...
August 16, 2018: Scientific Reports
Yongbo Song, Kelly Lambright, Meng Zhou, Kristin Kirschbaum, Ji Xiang, Andong Xia, Manzhou Zhu, Rongchao Jin
Solving the atomic structure of large-sized metal nanoclusters is a highly challenging task yet critically important for understanding the properties and developing applications. Herein, we report a stable silver nanocluster-Ag146Br2(SR)80 (where R = 4-isopropylbenzenethiol) with its structure solved by X-ray crystallography. Gram-scale synthesis with high yield has been achieved by a one-pot reaction, which offers opportunities for functionalization and applications. This silver nanocluster possesses a core-shell structure with an Ag51 core surrounded by a shell of Ag95Br2S80...
August 16, 2018: ACS Nano
Lingling Ran, Haiyang Li, Wenzhi Wu, Yachen Gao, Zhijun Chai, Jin Xiao, Qinghua Li, Degui Kong
In this study, the ultrafast optical properties of type-II CdZnS/ZnSe core-shell quantum dots were investigated using the Z-scan and transient absorption technique with femtosecond pulses. With 800-nm wavelength excitation, the CdZnS/ZnSe quantum dots exhibited two-photon absorption, and the two-photon absorption cross section was obtained as about 3.37 × 106 GM. In addition, the transfer time of electrons and the recombination lifetime of a single exciton were obtained. For the photoluminescence of the CdZnS/ZnSe quantum dots at temperatures from 80 to 280 K, the peak position redshifted by 60 meV, width broadened by 3 meV, and intensity decreased by a factor of four...
July 9, 2018: Optics Express
Xiuling Xu, Fan Hu, Qi Shuai
A facile reversed-phase microemulsion method was used to synthesize shell-core nanospheres of SiO2 @RCs (SiO2 -encapsuled rare-earth metal complexes). β-d-Galactose was then grafted onto the surfaces of the nanospheres through the copper(I)-catalyzed azide-alkyne cycloaddition click reaction for targeted delivery. The chemical characteristics and surface profiles of the nanocarriers were investigated by Fourier transform infrared spectroscopy, dynamic light scattering, transmission electron microscopy, and scanning electron microscopy...
August 16, 2018: Inorganic Chemistry
Fatemeh Davodi, Elisabeth Mühlhausen, Mohammad Tavakkoli, Jani Sainio, Hua Jiang, Bilal Gökce, Galina Marzun, Tanja Kallio
Earth abundant element based inorganic - organic hybrid materials are attractive alternative for electrocatalysing energy conversion reactions. Such material structures do not only increase the surface area and stability of metal nanoparticles (NPs) but also modify the electrocatalytic performance. Here, we introduce, for the first time, multiwall carbon nanotubes (MWNTs) functionalized with nitrogen-rich emeraldine salt (ES) as a promising catalyst support (denoted as ES-MWNT) to boost the electrocatalytic activity of magnetic maghemite (γ-Fe2O3) NPs...
August 16, 2018: ACS Applied Materials & Interfaces
Anupriya K Haridasa, Ji-Eun Lim, Du-Hyun Lim, Jeha Kim, Kwon-Koo Cho, Aleksandar Matic, Jae-Kwang Kim, Jou-Hyeon Ahn
FeS2/C core-shell nanofiber webs were synthesized for the first time via a unique synthesis strategy, coupling electrospinning and carbon coating of the nanofibers with sucrose. The design of one-dimensional core-shell morphology was found to be greatly beneficial for accommodating the volume changes encountered during cycling, to induce shorter lithium ion diffusion pathways in the electrode, and to prevent sulfur dissolution during cycling. A high discharge capacity of 545 mAh g-1 was retained after 500 cycles at 1 C, exhibiting super-stable cycling performance with 98...
August 16, 2018: ChemSusChem
Jianping Yang, Qingqing Wang, Wei Luo, Xinqi Chen, Jianwei Fan, Weizhong Jiang, Lianjun Wang, Wan Jiang, Weixian Zhang
The all-in-one architecture, uniform nanoscale zero-valent iron nanoparticles wrapped in hollow porous carbon shells, for wastewater treatment and used as a catalyst is highly desirable in environmental applications but remains a significant challenge. We propose the spatially confined strategy for the in-situ preparation of uniform Fe0@mC yolk-shell nanospheres, where the iron nanoparticles are encapsulated into thin and open porous carbon shells. The unique Fe0@mC yolk-shell nanosphere is elaborately designed by utilizing silica and phenolic one-step coated magnetite nanoparticles core-shell structures as a template by means of selectively etching and in-situ thermally reduction...
August 16, 2018: Chemistry: a European Journal
Janne-Mieke Meijer, Jérôme J Crassous
Charged fluorescent bowl-shaped colloids consisting of a polystyrene core surrounded by a poly(N-isopropylmethacrylamide) shell are obtained by nanoengineering spherical composite microgels. The phase diagram of these soft bowl-shaped colloids interacting through long-range Yukawa-type interactions is investigated using confocal laser scanning microscopy. The bowl-shaped structure leads to marked differences in phase-behavior compared to their spherical counterpart. With increasing number density, a transition from a fluid to a plastic crystal phase, with freely rotating particles, followed by a glass-like state is observed...
August 15, 2018: Small
Yifan Jin, Rodney J Bartlett
This manuscript presents the first consistent ionization potential (IP) optimized global hybrid functional to accurately estimate the vertical ionization and excitation energies of the inner-shell electrons in molecules. The new method fulfills the IP theorem that the Kohn-Sham eigenvalues of all the occupied orbitals (including the core orbitals) are good approximations to the exact vertical ionization energies. The accuracy of the one-particle spectrum is essential to enabling the one-particle density functional theory (DFT) to provide accurate results...
August 14, 2018: Journal of Chemical Physics
Prabir Khatua, Sanjoy Bandyopadhyay
Aggregation of amyloid beta (A β ) peptides in the brain is responsible for one of the most devastating neurodegenerative diseases, namely, Alzheimer's disease. In this study, we have carried out atomistic molecular dynamics simulations to explore the effects of non-uniform structural distortions of A β 17-42 pre-fibrillar aggregates of different sizes on the microscopic structure and ordering of water molecules confined within their amphiphilic nanocores. The calculations revealed non-uniform peptide-water interactions resulting in simultaneous existence of both highly ordered and disordered water molecules within the spatially heterogeneous confined environment of the protofilament cores...
August 14, 2018: Journal of Chemical Physics
Johannes Wiest, Marco Saedtler, Bettina Böttcher, Marvin Grüne, Maude Reggane, Bruno Galli, Ulrike Holzgrabe, Lorenz Meinel
Solubilization of lipophilic drugs is essential for efficient uptake. We detail the solubilization of Imatinib in simulated gastrointestinal fluids containing taurocholate and lecithin and reflecting fasted versus fed states using NMR spectroscopy, X-ray diffractometry, transmission electron microscopy, and dynamic light scattering analysis. Imatinib concentration impacted colloidal geometries and molecular dynamics in fasted state. At drug substance concentrations up to 250 µM, Imatinib was mainly engulfed within the core of > 110 nm in diameter vesicles...
August 15, 2018: Molecular Pharmaceutics
Yongling Zhang, Yudi Shi, Zhengkun Qin, Mingxing Song, Weiping Qin
Small fluoride nanoparticles (NPs) with strong down-conversion (DC) luminescence at 1.5 μm are quite desirable for optical fiber communication systems. Nevertheless, a problem exists regarding how to synthesize small fluoride NPs with strong DC emission at 1.5 μm. Herein, we propose an approach to improve 1.5 μm emission of BaLuF₅:Yb3+ ,Er3+ NPs by way of combining doping Ce3+ ions and coating multiple BaLuF₅: Yb3+ active-shells. We prepared the BaLuF₅:18%Yb3+ ,2%Er3+ ,2%Ce3+ NPs through a high-boiling solvent method...
August 14, 2018: Nanomaterials
Parag Adhyapak, Rohini Aiyer, Sreekantha Reddy Dugasani, Hyeong-U Kim, Chung Kil Song, Ajayan Vinu, Venkatesan Renugopalakrishnan, Sung Ha Park, Taesung Kim, Haiwon Lee, Dinesh Amalnerkar
We herein report a simple chemical route to prepare Au-Ag and Ag-Au core-shell bimetallic nanostructures by reduction of two kinds of noble metal ions in the presence of a water-soluble polymer such as poly(vinyl alcohol) (PVA). PVA was intentionally chosen as it can play a dual role of a supporting matrix as well as stabilizer. The simultaneous reduction of metal ions leads to an alloy type of structure. Ag(c)-Au(s) core-shell structures display tendency to form prismatic nanostructures in conjunction with nanocubes while Au(c)-Ag(s) core-shell structures show formation of merely nanocubes...
June 2018: Royal Society Open Science
Haobijam Johnson Singh, Ambarish Ghosh
Photonic manipulation with plasmonic materials is typically associated with high ohmic losses, which has triggered interest in alternative strategies based on low loss dielectric materials. Here we describe a novel dielectric nanomaterial capable of supporting strong Mie resonances from the visible to IR regimes. The fundamental block of this metamaterial is based on nanopillars in a core-shell configuration, with a large refractive index (RI) contrast between the (low RI) core and the (high RI) shell. The material showed strongly tunable optical resonances that varied from visible to near and mid IR as a function of shell thickness, core diameter and inter-pillar spacing...
August 15, 2018: Nanoscale
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