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One pot synthesis of core shell nanoparticles

Marcus U Witt, Stephan Hinrichs, Nadir Möller, Sebastian Backes, Birgit Fischer, Regine von Klitzing
The aim of this study is to tailor the inner structure of positively charged poly-(N-Isopropylacrylamid-co-allylamine) (P(NIPAM-co-AA)) microgels for a better control of the distribution of negatively charged magnetic cobaltferrite (CoFe_2 O_4 @CA) nanoparticles (MNP) within the microgels. Therefore, two different strategies are followed for the microgel synthesis: the (one pot) batch method which leads to a higher crosslinker density in the microgel core and the feeding method which compensates different reaction kinetics of the crosslinker and the monomers...
February 12, 2019: Journal of Physical Chemistry. B
Yahong Chai, Feng Feng, Qilong Li, Chanchan Yu, Xueyan Feng, Pan Lu, Xiaolin Yu, Maofa Ge, Xiuyu Wang, Li Yao
Exchange coupled bimagnetic core/shell nanoparticles are promising for emerging multiferroic and spintronic technologies compared with traditional, single-phase materials, as they deliver numerous appealing effects, such as large exchange bias, tailored coercivities, and tunable blocking temperatures. However, it remains a challenge to manipulate their magnetic properties via exchange coupling due to the lack of a straightforward method that enables the general preparation of desired composites. Here we report a robust and general one-pot approach for the synthesis of different kinds of bimagnetic core/shell nanostructures (BMCS NSs)...
February 9, 2019: Journal of the American Chemical Society
Jamshid Rakhtshah, Behrouz Shaabani, Sadegh Salehzadeh, Neda Hosseinpour Moghadam
An air- and moisture-stable molybdenum Schiff base complexes immobilized on magnetic iron oxide nanoparticles with a core-shell structure was developed for utilization as a new heterogeneous catalyst. The surface, structural and magnetic characteristics of the nanomaterials were characterized by using Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and inductively coupled plasma atomic emission spectroscopy (ICP-AES)...
January 11, 2019: Bioorganic Chemistry
Zhi-Suo Lv, Xiao-Yan Zhu, Han-Bin Meng, Jiu-Ju Feng, Ai-Jun Wang
Herein, highly branched Pt@Ag core-shell nanoparticles (Pt@Ag NPs) were fabricated by a facile one-pot wet-chemical approach, where poly(ethyleneimine) (PEI) served as structure-directing and capping agents. Their structure, morphology and composition were mainly characterized by a set of techniques. And their growth mechanism was discussed in some detail. The prepared catalyst exhibited remarkable enhancement in catalytic activity of 4-nitrophenol (4-NP) reduction as a proof-of-concept application, surpassing commercial Pt black and home-made Ag NPs catalysts...
December 1, 2018: Journal of Colloid and Interface Science
Yu Long, Zekun Gao, Jiaheng Qin, Peng Wang, Wei Wu, Lin Zhang, Zhengping Dong, Jiantai Ma
Four types of core-shell materials with magnetic Fe3 O4 microparticles as the core were prepared through different approaches using dopamine, glucose, tetrabutyl orthotitanate (TBOT), and tetraethyl orthosilicate (TEOS) as the shell precursor, respectively. CeO2 nanoparticles (NPs) was successfully immobilized onto these supports to fabricate efficient catalysts for the tandem catalytic synthesis of imines from benzyl alcohols and anilines at low temperature under air atmosphere. The as-prepared catalysts were detailedly characterized by TEM, EDX, XRD, FT-IR, XPS VSM, ICP, and CO2 -TPD...
November 24, 2018: Journal of Colloid and Interface Science
Ali Maleki, Razieh Firouzi-Haji
In this work, an efficient method for the immobilization of L-proline on magnetic nanoparticles was offered and evaluated as a recoverable magnetic nanocatalyst for synthesis of 2,4,6-triarylpyridines through one-pot three-component reaction of acetophenone, aryl aldehydes and ammonium acetate. This article is the first report of the catalytic application of L-proline functionalized magnetic nanoparticles in organic reactions as a magnetic nanocatalyst. This novel magnetic nanocatalyst proved to be effective and provided the products in high to excellent yield under solvent-free conditions...
November 23, 2018: Scientific Reports
Bing Chen, Feng Wang
A new class of core-satellite upconversion nanoparticles (UCNPs) formed through a kinetically controlled oriented attachment is presented. The core-satellite UCNPs comprising an optically active α-NaYbF4 core and several CaF2 satellites are synthesized by a one-pot sequential injection technique. Compared to conventional core-shell UCNPs, these core-satellite UCNPs show larger surface-to-volume ratios and are suitable for further surface modifications. As a proof-of-concept, a biosensing system is constructed by coating MnO2 nanosheets on the α-NaYbF4:Tm@CaF2 core-satellite UCNPs for high-sensitivity biothiol detection...
November 1, 2018: Nanoscale
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
Haotian Hao, Guifeng Liu, Yili Wang, Baoyou Shi, Kun Han, Yuan Zhuang, Yan Kong
In this study, a regenerable magnetic core-shell nanoparticles NH2 -Fe3 O4 -NTA which include 3-aminopropyltriethoxysilane (APTES) and nitrilotriacetic acid (NTA) crosslinked to Fe3 O4 was developed by one-pot method for simultaneous removal of cationic and anionic metals. Another nanocomposite NH2 -Fe3 O4 -NTAII was prepared by multi-step method for comparison. NH2 -Fe3 O4 -NTA had positive zeta potential values of 35.1-0.8 mV at pH 1.8-11.0, with the saturation magnetization and surface area up to 40.56 emu/g and 56...
January 15, 2019: Journal of Hazardous Materials
Shu Fen Tan, Geeta Bisht, Utkarsh Anand, Michel Bosman, Xin Ee Yong, Utkur Mirsaidov
One-pot wet-chemical synthesis is a simple way to obtain nanoparticles (NPs) with a well-defined shape and composition. However, achieving good control over NP synthesis would require a comprehensive understanding of the mechanisms of NP formation, something that is challenging to obtain experimentally. Here, we study the formation of gold (Au) core-palladium (Pd) shell NPs under kinetically and thermodynamically controlled reaction conditions using in situ liquid cell transmission electron microscopy (TEM)...
September 19, 2018: Journal of the American Chemical Society
Qixuan Zhong, Muhan Cao, Huicheng Hu, Di Yang, Min Chen, Pengli Li, Linzhong Wu, Qiao Zhang
The practical applications of CsPbX3 nanocrystals (NCs) have been limited by their poor stability. Although much effort has been devoted to making core-shell nanostructures to enhance the stability of CsPbX3 NCs, it is still very difficult to coat CsPbX3 NCs with another material on a single-particle level. In this work, we report a facile one-pot approach to synthesize CsPbBr3 @SiO2 core-shell nanoparticles (NPs), in which each core-shell NP has only one CsPbBr3 NC. The formation process has been carefully monitored...
August 28, 2018: ACS Nano
Alexander G R Howe, Peter J Miedziak, David J Morgan, Qian He, Peter Strasser, Jennifer K Edwards
A series of 1 wt% supported Au, Pd and AuPd nanoalloy catalysts were prepared via microwave assisted reduction of PdCl2 and HAuCl4 in a facile, one pot process. The resulting materials showed excellent activity for the direct synthesis of hydrogen peroxide from hydrogen and oxygen, with a synergistic effect observed on the addition of Au into a Pd catalyst. Detailed electron microscopy showed that the bimetallic particles exhibited a core-shell morphology, with an Au core surrounded by an Au-Pd shell, with a size between 10-20 nm...
September 3, 2018: Faraday Discussions
Julia Hesse, Dennis T Klier, Massimo Sgarzi, Anne Nsubuga, Christoph Bauer, Jörg Grenzer, René Hübner, Marcus Wislicenus, Tanmaya Joshi, Michael U Kumke, Holger Stephan
We report a simple one-pot method for the rapid preparation of sub-10 nm pure hexagonal (β-phase) NaYF4 -based upconverting nanoparticles (UCNPs). Using Therminol®  66 as a co-solvent, monodisperse UCNPs could be obtained in unusually short reaction times. By varying the reaction time and reaction temperature, it was possible to control precisely the particle size and crystalline phase of the UCNPs. The upconversion (UC) luminescence properties of the nanocrystals were tuned by varying the concentrations of the dopants (Nd3+ and Yb3+ sensitizer ions and Er3+ activator ions)...
February 2018: ChemistryOpen
Dong-Ning Li, Ya-Mei He, Jiu-Ju Feng, Qian-Li Zhang, Lu Zhang, Liang Wu, Ai-Jun Wang
Herein, prickly platinum-palladium core-shell nanocrystals (Pt@Pd NCs) were prepared by a facile one-pot aqueous method, only taking sodium pyrrolidone carboxylate (PCA-Na) as the structure director and stabilizing agent. The products were mainly characterized by microscopic analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), followed by discussing the formation mechanism in details. The electrochemical characterizations were examined by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA)...
April 15, 2018: Journal of Colloid and Interface Science
Jingwen Feng, Jia Liu, Xiaoyan Cheng, Jiajia Liu, Meng Xu, Jiatao Zhang
Yolk-shell hybrid nanoparticles with noble metal core and programmed semiconductor shell composition may exhibit synergistic effects and tunable catalytic properties. In this work, the hydrothermal cation exchange synthesis of Au@ZnS-AgAuS yolk-shell nanocrystals (Y-S NCs) with well-fabricated void size, grain-boundary-architectured ZnS-AgAuS shell and in situ generated Au cocatalyst are demonstrated. Starting from the novel cavity-free Au@AgAuS core-shell NCs, via aqueous cation exchange reaction with Zn2+ , the gradual evolution with produced Au@ZnS-AgAuS Y-S NCs can be achieved successfully...
January 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Wendong Ke, Wei Yin, Zengshi Zha, Jean Felix Mukerabigwi, Weijian Chen, Yuheng Wang, Chuanxin He, Zhishen Ge
Block copolymer prodrugs (BCPs) have attracted considerable attentions in clinical translation of nanomedicine owing to their self-assembly into well-defined core-shell nanoparticles for improved pharmacokinetics, stability in blood circulation without drug leakage, and optimized biodistribution. However, a cascade of physiological barriers against specific delivery of drugs into tumor cells limit the final therapeutic efficacy. Herein, we report a robust and facile strategy based on thiolactone chemistry to fabricate well-defined BCPs with sequential tumor pH-promoted cellular internalization and intracellular stimuli-responsive drug release...
February 2018: Biomaterials
Qi Wang, Zhiliang Zhao, Yanlin Jia, Mingpu Wang, Weihong Qi, Yong Pang, Jiang Yi, Yufang Zhang, Zhou Li, Zhuo Zhang
Although tremendous efforts have been devoted to the exploration of cost-effective, active, and stable electrochemical catalysts, only few significant breakthroughs have been achieved up to now. Therefore, exploring new catalysts and improving catalyst activity and stability are still major tasks at present. Controllable synthesis of Pt-based alloy nanocrystals with a uniform high-index surface and unique architecture has been regarded as an effective strategy to optimize their catalytic efficiency toward electrochemical reactions...
October 25, 2017: ACS Applied Materials & Interfaces
Sarah Schmidt, Isabella Tavernaro, Christian Cavelius, Eva Weber, Alexander Kümper, Carmen Schmitz, Jana Fleddermann, Annette Kraegeloh
In this study, a novel approach for preparation of green fluorescent protein (GFP)-doped silica nanoparticles with a narrow size distribution is presented. GFP was chosen as a model protein due to its autofluorescence. Protein-doped nanoparticles have a high application potential in the field of intracellular protein delivery. In addition, fluorescently labelled particles can be used for bioimaging. The size of these protein-doped nanoparticles was adjusted from 15 to 35 nm using a multistep synthesis process, comprising the particle core synthesis followed by shell regrowth steps...
September 25, 2017: Nanoscale Research Letters
Diego Bouzas-Ramos, Marta García-Cortes, Alfredo Sanz-Medel, Jorge Ruiz Encinar, José M Costa-Fernández
Coupling of asymmetric flow field-flow fractionation (AF4) to an on-line elemental detection (inductively coupled plasma-mass spectrometry, ICP-MS) has been recently proposed as a powerful diagnostic tool for characterization of the bioconjugation of CdSe/ZnS core-shell Quantum Dots (QDs) to antibodies. Such approach has been used herein to demonstrate that cap exchange of the native hydrophobic shell of core/shell QDs with the bidentate dihydrolipoic acid ligands directly removes completely the eventual side nanoparticulated populations generated during simple one-pot synthesis, which can ruin the subsequent final bioapplication...
October 13, 2017: Journal of Chromatography. A
Hang Sun, Qinrong He, Ping She, Shan Zeng, Kongliang Xu, Jiayi Li, Song Liang, Zhenning Liu
Natural biological systems often use hollow structures to decrease reflection and achieve high solar light utilization. Herein, bio-inspired Au@TiO2 yolk-shell nanoparticles (NPs) have been designed to combine the advantages of noble metal coupling and hollow structures, and subsequently synthesized via a facile one-pot hydrothermal approach. The Au@TiO2 yolk-shell NPs not only exhibit reduced reflectance by multiple reflections and scattering within the hollow NPs, but also show enhanced photocatalytic activity in Rhodamine B (RhB) degradation by simultaneously improving light harvesting, charge separation and reaction site accessibility...
November 1, 2017: Journal of Colloid and Interface Science
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