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Xiaoru Li, Hongyan Li, Guojun Song, Zhi Peng, Lichun Ma, Chengzhen Meng, Yang Liu, Kaidi Ding
A new preparation method of three-layer coaxial nanocables has been developed in this work. Nd/FM (FM=Fe, Co, Ni)/PA66 three-layer coaxial nanocables were assembled successfully from outer to inner layer by layer. PA66 nanotubes which served as the outer shell were prepared by polymer solution wetting AAO template. Ferromagnetic metals and Nd were deposited into pre-prepared PA66 nanotubes to be served as the middle layer and inner core, respectively. The results show that the structure has effects on the magnetic properties, and the nanocable preparation allows each layer, length, and thickness of the nanocables to be tuned...
October 19, 2018: Nanoscale Research Letters
Yilong Lei, Yanqiu Sun, Yi Zhang, Hongyang Zhang, Haihua Zhang, Zhengong Meng, Wai-Yeung Wong, Jiannian Yao, Hongbing Fu
Integrating together two dissimilar π-conjugated molecules into controlled complex topological configurations remains a largely unsolved problem owing to the diversity of organic species and their respective different assembly features. Here, we find that two structurally similar organic semiconductors, 9,10-bis(phenylethynyl)anthracene (BA) and 5,12-bis(phenylethynyl)naphthacene (BN), co-assemble into two-component helices by control of the growth kinetics as well as the molar ratio of BA/BN. The helical superstructures made of planar and twisted bis(phenylethynyl) derivatives can be regarded as (BA)x (BN)1-x alloys, which are formed due to compatible structural relationship between BA and BN...
October 19, 2018: Nature Communications
Hyeon Jin Jung, Ravindranadh Koutavarapu, Seulki Lee, Ju Hyun Kim, Hyun Chul Choi, Myong Yong Choi
To achieve enhanced photocatalytic activity for the degradation of lindane, we prepared metal-semiconductor composite nanoparticles (NPs). Zn@ZnO core-shell (CS) nanocomposites, calcined ZnO, and Ag-doped ZnO (ZnO/Ag) nanostructures were prepared using pulsed laser ablation in liquid, calcination, and photodeposition methods, respectively, without using surfactants or catalysts. The as-prepared catalysts were characterized by using X-ray diffraction (XRD), field-emission scanning electron microscopy, high-resolution transmission electron microscopy, ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence spectroscopy...
December 2018: Journal of Environmental Sciences (China)
Esther Cazares-Cortes, Maria Nerantzaki, Jérôme Fresnais, Claire Wilhelm, Nébéwia Griffete, Christine Ménager
Herein, original magnetic drug delivery nanomaterials for cancer therapy are developed and compared, with the purpose to show active control over drug release by using an alternative magnetic field (AMF). The rationale is to combine polymers and superparamagnetic nanoparticles to trigger such drug release under AMF. Two magnetic nanosystems are thus presented: magnetic nanogels made of thermosensitive and biocompatible polymers and core-shell nanoparticles with a magnetic core and a molecularly imprinted polymer as shell...
October 18, 2018: Nanomaterials
Fa-Wei Shen, Kai-Chun Zhou, Hao Cai, Yi-Na Zhang, Yong-Li Zheng, Jing Quan
Thermosensitive glucose-functionalized glycopolymers grafted gold nanoparticles (Glyco@GNPs) with good colloidal stability and thermosensitive in aqueous solution were fabricated by reversible addition-fragmentation chain transfer (RAFT) mediated one-pot synthesis. The formation of core-shell morphology with about a 60 nm gold core in diameter and a glycopolymer shell of about 80 nm in thickness was indicated by transmission electron microscopy (TEM). The recognition ability of the Glyco@GNPs toward lectin concannavalin A (Con A) was verified by ultraviolet-visible spectroscopy and dynamic light scattering (DLS)...
October 10, 2018: Colloids and Surfaces. B, Biointerfaces
Daniel M Chevrier, Lluís Raich, Carme Rovira, Anindita Das, Zhentao Luo, Qiaofeng Yao, Amares Chatt, Jianping Xie, Rongchao Jin, Jaakko Akola, Peng Zhang
Due to the small size and large surface area of thiolate-protected Au nanoclusters (NCs), the protecting ligands are expected to play a substantial role in modulating the structure and properties, particularly in the solution phase. How-ever, little is known on how thiolate ligands explicitly modulate the structural properties of the NCs at atomic level, alt-hough this information is critical for predicting the performance of AuNCs in application settings including as a catalyst interacting with small molecules and as a sensor interacting with biomolecular systems...
October 19, 2018: Journal of the American Chemical Society
Pravin Vejan, Rosazlin Abdullah, Tumirah Khadiran, Salmah Ismail
Sustainable crop production for a rapidly growing human population is one of the current challenges faced by the agricultural sector. However, many of the chemical agents used in agriculture can be hazardous to humans, non-targeted organism and environment. Plant growth promoting rhizobacteria have demonstrated role in promoting plant growth and health under various stress conditions including disease. Unfortunately, bacteria viability degrades due to temperature and other environmental factors (Bashan et al...
October 19, 2018: Letters in Applied Microbiology
Jiangyan Wang, Lei Liao, Yuzhang Li, Jie Zhao, Feifei Shi, Kai Yan, Allen Pei, Guangxu Chen, Guodong Li, Zhiyi Lu, Yi Cui
Nanostructure-design of a pre-reserved hollow space to accommodate 300% volume change of silicon anodes has created exciting promises for high energy batteries. However, challenges with weak mechanical stability during the calendering process of electrode fabrication and poor volumetric energy density remain to be solved. Here we fabricated a pressure-resistant silicon structure by designing a dense silicon shell coating onto secondary micrometer particles, each consisting of many silicon nanoparticles. The silicon skin layer significantly improves mechanical stability, while the inner porous structure efficiently accommodates the volume expansion...
October 19, 2018: Nano Letters
Xiao Liang, Shu-Mao Xu, Jun Zhang, Jing Li, Qi Shen
Tumor cells are vulnerable to reactive oxygen species (ROS). However, it is still a challenge to induce ROS efficiently in tumor cells. In this study, cascade amplifiers of intracellular ROS based on charge-reversible mitochondria-targeted ZnO-TPP@D/H nanorods were firstly developed for breast cancer therapy. The core-shell ZnO-TPP@D/H nanorod with particle size of 179.60 ± 5.67 nm was composed of a core of ZnO nanorod, an inner shell of triphenyl phosphonium (TPP), and an outer shell of heparin. DOX was loaded on ZnO-TPP@D/H nanorods with high drug loading efficiency of 22...
October 19, 2018: ACS Applied Materials & Interfaces
Xiao Zhao, Shinobu Takao, Takuma Kaneko, Yasuhiro Iwasawa
It remains a big challenge to remarkably improve both oxygen reduction reaction (ORR) activity and long-term durability of Pt-M bimetal electrocatalysts simultaneously in the harsh cathode environment toward widespread commercialization of polymer electrolyte fuel cells (PEFC). In this account we found double-promotional effects of carbon micro coil (CMC) support on ORR performance and durability of octahedral Pt3 Ni nanoparticles (Oh Pt3 Ni/CMC). The Oh Pt3 Ni/CMC displayed remarkable improvements of mass activity (MA; 13...
October 19, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Zhong Li, Li-Dan Lin, Hao Yu, Xin-Xiong Li, Shou-Tian Zheng
This work demonstrates that the use of high-negative and high-symmetry lacunary polyoxometalates (POMs) for the clustering of alkali metal ions is a feasible strategy not only for the formation of rare high-nuclearity alkali-metal clusters but also for the construction of new-type all-inorganic ionic porous materials. By the strategy, an unprecedented high-nuclearity K-H2 O cluster {K42 (H2 O)60 } with core-shell K6 @K36 configuration is stabilized by 8 C3v -symmetry trivacant POMs [GeW9 O34 ]10- , forming a novel giant ionic alkali-metal-POM composite cluster {K42 Ge8 W72 O272 (H2 O)60 } with more than 100 metal centers...
October 19, 2018: Angewandte Chemie
Sara Rahnama, Shahab Shariati, Fatan Divsar
In this research, a novel magnetite titanium dioxide nanomesopore functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its potential for efficient removal of Acid fuchsine (AF) as an anionic dye from aqueous solutions was investigated. For this aim, the core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as magnetic core, tetra ethyl orthosilicate as silica and tetra butyl titanate as titanium sources for shell. The synthesized nanomesopores (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments...
October 19, 2018: Combinatorial Chemistry & High Throughput Screening
Peng Wang, Hong Tang, Peng Zhang
AIM: Nanoparticle-based photosensitizers containing silver core and mesoporous silica shell with hematoporphyrin IX embedded were developed to treat vulgaris photodynamically. MATERIALS & METHODS: The hybrid photosensitizers were dispersed in 30% polyethylene glycol (PEG-200) solution and used for the photodynamic treatment of Staph epidermidis and Propionibacterium acnes under the illumination of a portable LED (∼410 nm). RESULTS: After a 5 min illumination by the LED, the hybrid photosensitizers of 50 μg/ml displayed killing efficacy of approximately 5-log for S...
October 19, 2018: Nanomedicine
Xinxu Jia, Xiang Wu, Baodan Liu
In this work, ZnCo2O4@MnO2 core-shell structures are successfully prepared on nickel foam by a simple hydrothermal approach. The obtained core-shell structures exhibit excellent areal capacitance and cycling stability, which may be ascribed to the rational design of a hybrid-material based electrode structure that facilitates ion transport. The as-assembled supercapacitor device shows outstanding specific capacitance, demonstrating that ZnCo2O4@MnO2 core-shell structure is a candidate as a supercapacitor electrode material in flexible energy storage applications...
October 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Lei Liu, Gaojian Ma, Min Zeng, Wei Du, Jinying Yuan
Nano-adsorbents composed of poly(4-vinylphenyl boronic acid) shell and silica core efficiently remove residual glycerol from a lipase catalyst layer in biodiesel fuel production, resulting in excellent lipase recycling. The subsequent CO2-acidolysis endows the adsorbents with sustainable renewability.
October 19, 2018: Chemical Communications: Chem Comm
Yang Shen, Xiaodong Yang, Yue Bian, Kuiying Nie, Songmin Liu, Kun Tang, Rong Zhang, Youdou Zheng, Shulin Gu
In recent years, various kinds of ZnO-based core@shell nanomaterials have been paid much attention due to their widespread applications in the fields of physics, chemistry and energy conversion. In this work, the electronic and optical properties of a new type of ZnO-based one-dimensional core@shell nanostructure, which is composed of inner ZnO nanowire and outer carbon nanotube (CNT), is calculated based on the first-principles density functional theory (DFT). Calculation results suggest that the ZnO nanowire encapsulated in (9, 9)-CNT is the most stable structure from the view of formation energy...
October 18, 2018: Scientific Reports
Aidin Lak, Marco Cassani, Binh T Mai, Naomi Winckelmans, David Cabrera, Elaheh Sadrollahi, Sergio Marras, Hilke Remmer, Sergio Fiorito, Lucia Cremades-Jimeno, Fred Jochen Litterst, Frank Ludwig, Liberato Manna, Francisco J Teran, Sara Bals, Teresa Pellegrino
Herein, by studying a stepwise phase transformation of 23 nm FeO-Fe3O4 core-shell nanocubes into Fe3O4, we identify a composition at which the magnetic heating performance of the nanocubes is not affected by the medium viscosity and aggregation. Structural and magnetic characterizations reveal the transformation of the FeO-Fe3O4 nanocubes from having stoichiometric phase compositions into Fe2+ deficient Fe3O4 phases. The resultant nanocubes contain tiny compressed and randomly distributed FeO sub-domains as well as structural defects...
October 18, 2018: Nano Letters
Arthur C Pinon, Urban Skantze, Jasmine Viger-Gravel, Staffan Schantz, Lyndon Emsley
The structure of crystalline nanoparticles (CNPs) is determined using dynamic nuclear polarization (DNP) enhanced NMR spectrosco-py experiments. The CNPs are composed of a crystalline core containing an active pharmaceutical ingredient (compound P), coated with a layer of PEG (DSPE-PEG 5000) located at the crystal surface, in a D2O suspension. Relayed DNP experiments are performed to study 1H-1H spin diffusion and to determine the size of the crystalline core as well as the thickness of the PEG overlayer. This is achieved through selective doping to create a heterogeneous system in which the D2O contains glycerol and organic radicals, which act as polariza-tion sources, and the CNPs are exempt of radical molecules...
October 18, 2018: Journal of Physical Chemistry. A
Le Fu, Ling Xie, Wenbo Fu, Shuanglin Hu, Zhi-Bin Zhang, Klaus Leifer, Håkan Engqvist, Wei Xia
Transparent/translucent glass ceramics (GCs) have broad applications in biomedicine, armor, energy, and constructions. However, GCs with improved optical properties typically suffer from impaired mechanical properties, compared to traditional sintered full-ceramics. We present a method of obtaining high-strength, translucent GCs by preparing ZrO2-SiO2 nanocrystalline glass ceramics (NCGCs), with a microstructure of monocrystalline ZrO2 nanoparticles (NPs), embedded in an amorphous SiO2 matrix. The ZrO2-SiO2 NCGC with a composition of 65%ZrO2-35%SiO2 (molar ratio, 65Zr) achieved an average flexural strength of 1 GPa...
October 18, 2018: Nano Letters
Inho Kim, Myung-Gi Seo, Changhyeok Choi, Jin Soo Kim, Euiyoung Jung, Geun-Ho Han, Jae-Chul Lee, Sang Soo Han, Jae-Pyoung Ahn, Yousung Jung, Kwan-Young Lee, Taekyung Yu
The catalytic properties of materials are determined by their electronic structures, which are based on the arrangement of atoms. Using precise calculations, synthesis, analysis, and catalytic activity studies, we demonstrate that changing the lattice constant of a material can modify its electronic structure and therefore its catalytic activity. Pd/Au core/shell nanocubes with a thin Au shell thickness of 1 nm exhibit high H2O2 production rates due to their improved oxygen binding energy (∆EO) and hydrogen binding energy (∆EH), as well as their reduced activation barriers for key reactions...
October 18, 2018: ACS Applied Materials & Interfaces
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