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Templating core-shell particles using metal ion-chelating biosurfactants

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Particuology 2022年第5期20卷 145-152页

作者： Ching-Min Yeh Thomas Jarrett Yuan Gao Chun-Xia Zhao Andrew Whittaker Frank Sainsbury Alison L.White Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt.LuciaQueensland4072Australia ARC Centre of Excellence in Convergent Bio-Nano Science and Technology The University of QueenslandSt Lucia4072Australia CSIRO Probing Biosystems Future Science Platform BrisbaneAustralia Centre for Cell Factories and Biopolymers Griffith Institute for Drug DiscoveryGriffith UniversityBrisbaneQLD4111 Australia

Designer biosurfactants can be used to stabilise and functionalise *** particularly promising use is the stabilisation of oil-in-water emulsions,enabling fine tuning physical,chemical and biological surface *** ability of emulsion systems to carry high payloads makes them attractive for applications in medicine,food and fragrances,and ***,they have limited long-term *** we sought to use the metal ion-chelating ability of the biosurfactant peptide,AM1,to precipitate the formation of a gold metal shell on AM1-stabilised emulsions by electroless *** found that replacing the commonly used zinc(Ⅱ)with palladium(Ⅱ)for coordination by histidine residues of adjacent AM1 peptides produced interfacial films that maintained elasticity at acidic *** NMR suggested a coordination mechanism independent of the imidazole ring of the *** of emulsions at low pH enabled the deposition of a gold shell,albeit by an unexpected *** propose that gold nanoparticles forming in bulk are adsorbed onto the peptide-stabilised interface,accumulating into a particulate *** resulting one-step method for nanoparticle precipitation and shell formation will be useful for the creation of biocompatible core-shell particles for applications where large payloads of hydrophobic active compounds require stability over long time periods.

关键词： Biosurfactants Emulsion core-shell particles Electroless plating Histidine Interfacial elasticity

Optimized high performance liquid chromatography–ultraviolet detection method using core-shell particles for the therapeutic monitoring of methotrexate

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Journal of Pharmaceutical Analysis 2016年第2期6卷 103-111页

作者： milagros montemurro maría m.de zan juan c.robles Laboratorio de Control de Calidad de Medicamentos Facultad de Bioqufmica y Ciendas Biologicas Universidad Nacional del Litoral Santa Fe Argentina

Methotrexate （MTX） is an antineoplastic drug, and due to its high toxicity, the therapeutic drug mon- itoring is strictly conducted in the clinical practice. The chemometric optimization and validation of a high performance liquid chromatography （HPLC） method using core-shell particles is presented for the determination of MTX in plasma during therapeutic monitoring. Experimental design and response surface methodology （RSM） were applied for the optimization of the chromatographic system and the analyte extraction step. A Poroshel1120 EC-C18 （3.0 mm × 75 mm, 2.7 μm） column was used to obtain a fast and efficient separation in a complete run time of 4 min. The optimum conditions for the chroma- tographic system resulted in a mobile phase consisting of acetic acid/sodium acetate buffer solution （85.0 mM, pH =4.00） and 11.2% of acetonitrile at a flow rate of 0.4 mL/min. Selectivity, linearity, accuracy and precision were demonstrated in a range of 0.10-6.0 μM of MTX. The application of the optimized method required only 150μL of patient plasma and a low consumption of solvent to provide rapid re- sults.

关键词： HPLC core-shell particles Methotrexate Drug monitoring

Preparation and Characterization of HGM-Ni0.5Co0.5Fe2O4 core-shell particles by Homogeneous Coprecipitation

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Preparation and Characterization of HGM-Ni0.5Co0.5Fe2O4 Core...

FABRICATION OF core-shell PS/SiO2 particles AND HOLLOW SILICA MICROSPHERES BY CONTROLLED ASSEMBLY OF PREFORMED NANOP ARTICLES

中国材料大会2012

作者： Mei Yu Jingzhi Hu Jianhua Liu Songmei Li School of Materials Science and Engineering Beihang University

ISBN: (纸本)9783037856079

HGM-Ni0.5Co0.5Fe2O4 core-shell particles were prepared by plating Ni0.5Co0.5Fe2O4 magnetic film on hollow glass microsphere （HGM） from the aqueous solution containing NiCl2·6H2O, FeCl2·4H2O, CoCl2·6H2O and HGMs without sintering. Urea was used as precipitator, and air was used as oxidizer in homogeneous coprecipitation process. The morphologies, phase structures, shell thickness, chemical compositions and magnetic performances of the core-shell particles were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray spectroscopy （EDS） and vibrating sample magnetometer （VSM）, respectively. The results showed that a compact and continuous film with thickness at about 250 nm was coated on the HGM by the homogeneous coprecipitation process. The film was spinel ferrite phase, and was determined as the Ni0.5Co0.5Fe2O4 . The saturation magnetization （Ms） and the coercivity （Hc） of as-synthesized HGM-Ni0.5Co0.5Fe2O4 core-shell particles were 20.886emu/g and 97.174G, respectively.

关键词： Homogeneous coprecipitation HGM-Ni0.5Co0.5Fe2O4 core-shell particles Magnetism

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FABRICATION OF CORE-SHELL PS/SiO2 PARTICLES AND HOLLOW SILIC...

Continuous flow synthesis of plasmonic gold patches and nearly-complete nanoshells on polystyrene core particles

第二届中日化工学术研讨会

作者：朱以华杨晓玲丁素丽胡英 Key Laboratory for Ultra fine Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China Key Laboratory for Ultra fine Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China Key Laboratory for Ultra fine Materials of Ministry of Education East China University of Science and Technology Shanghai 200237 China Department of Chemistry East China University of Science and Technology Shanghai 200237 China

＜正＞ The core-shell PS/SiO2 composite particles with tailored dimensions have been prepared by layer-by-layer self-assembly using different size preformed nanoparticles. The polymer cores were removed by calcinations and hollow silica microspheres with tailored wall thickness were produced. TEM, FTIR and TG analysis shows that the SiO2 nanoparticles formed a uniform shell around the core, which turned into a clear-cut hollow sphere after calcinations. The silica content within the composite particles increased with the assembled silica diameter. Under the conditions of the same number layers of nanoparticles adsorpted on the PS latices, the diameter of the PS/SiO2 core-shell particles and the content of silica increased with increasing the assembled particle-size of silica.

关键词： core-shell particles layer-by-layer self-assembly hollow microspheres silica polyelectolyte

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Particuology 2023年第4期75卷 137-150页

作者： Thomas Meincke Robin N.Klupp Taylor Institute of Particle Technology Friedrich-Alexander University Erlangen-NürnbergCauerstrasse 491058ErlangenGermany Collaborative Research Center 1411-Design of Particulate Products Friedrich-Alexander University Erlangen-Nürnberg Cauerstrasse 391058 Erlangen Germany

We describe the development of a T-mixer based continuous flow process for the coating of 86-500 nm diameter spherical polystyrene particles with thin gold patches by heterogeneous nucleation and *** establishing a suitable flow rate for good mixing and sufficiently uniform product morphology we systematically investigate the main reaction *** reveals a considerable tunability of the patch morphology and,by virtue of the localized surface plasmon resonance of gold,the optical properties of the product *** order to further widen the range of nanostructures accessible by our process,a second T-mixer was *** introduced new gold precursor,leading to further growth of the patches that were formed after the first *** this approach,nearly-complete gold nanoshells could be produced in high yield on both small and large core particles,without the unwanted production of free-standing gold *** to the pronounced optical properties of nearly-complete gold nanoshells on small core particles,we could estimate from electrodynamic sim-ulations the equivalent shell thickness to be as low as 8.6 *** is significantly thinner than can be routinely achieved using the standard seeded growth approach to synthesise gold *** results are therefore highly promising for the gram-scale synthesis of plasmon resonant nanostructures with designed optical properties.

关键词： Continuous flow core-shell particles Patchy particles Nucleation Diffusion limited growth

INTERACTION OF ANTIGEN AND ANTIBODY ON core-shell POLYMERIC MICROSPHERES

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Chinese Journal of Polymer Science 2011年第2期29卷 267-273页

作者：李湛勇朱晓夏 Key Laboratory of Functional Polymer Materials Institute of Polymer ChemistryNankai University Departement de Chimie Universite de MontrealC.P.6128Succ.Centre-villeMontrealQCH3C 3J7Canada

Monodispersed microspheres with polystyrene as the core and poly（acrylamide-co-N-acryloxysuccinirnide） as the shell were synthesized by a two-step surfactant-free emulsion *** core-shell morphology of the microspheres was shown by scanning electron microscopy and transmission electron *** immunoglobulin G （as antigen） was covalently coupled onto the microspheres by the reaction between succinimide-activated ester groups on the shell of the microspheres and amino groups of the antigen *** size of particles was characterized by dynamic light scattering technique and was found to vary upon bioconjugation and interaction with *** binding process was shown to be specific to goat anti-rabbit immunoglobulin G（as antibody） and reversible upon the addition of free antigen into the system.

关键词： Surfactant-free emulsion polymerization core-shell particles Antigen Antibody Bioconjugation

Early stages of non-classic crystal growth

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Science China Chemistry 2011年第12期54卷 1867-1876页

作者： GREER Heather F. EaStChem School of ChemistryUniversity of St Andrews

Investigation of early stages of crystal growth revealed that crystal growth in some systems may not follow the classic *** the early stages of inorganic crystal growth,precursor molecules and/or nanocrystallites may aggregate into large and disordered particles with the assistance of some polymers or *** crystallization of these aggregates would then take place to form shells with high crystallinity and density,followed by an extension of the crystallization from surface to *** so-called reversed crystal growth mechanism has been found in crystallization of several inorganic compounds including zeolites,perovskites,metals and metal oxides,and will be identified in more material *** establishment of this new crystal growth route gave us more freedom to control the morphology of crystals and to understand the formation mechanism of many natural *** article gives a brief review of the recent research in this field by featuring some typical examples of the reversed crystal growth.

关键词： reversed crystal growth hollow crystals core-shell particles electron microscopy

Silver Hollow Microspheres: Large-scale Synthesis, Characterization and Electromagnetic Shielding Property

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Chinese Journal of Structural Chemistry 2010年第4期29卷 555-564页

作者：王一龙章桥新邵寒梅官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Chemistry School of Sciences Wuhan University of Technology

A facile and large-scale synthesis method to fabricate silver hollow microspheres with controllable morphologies and shell thickness is described using low-cost glass microspheres as templates. The method mainly involves two steps of the preparation of silver-coated glass microsphere core–shell particles by a controllable liquid reduced reaction of Ag[（NH3）2]＋ solution, which only produces silver nanoparticles anchored on the surface of the thiolated glass microsphere templates, and the removal of glass microspheres by wet chemical etching with HF solution. The products are well characterized by field emitted scanning electron microscopy （SEM）, transmitted electron microscopy （TEM）, X-ray photoelectron spectra （XPS）, X-ray diffraction （XRD） and energy dispersive X-ray （EDX） etc. The as-prepared core-shell particles and hollow particles have even and compact silver shells. The electromagnetic shielding coatings based on the silver hollow microspheres are demonstrated to have high conductivity, excellent shielding effectiveness and long durability, suggesting that the silver hollow microspheres obtained here are a novel light-weight electromagnetic shielding filler and will have extensive applications in the electromagnetic compatibility fields.

关键词： electroless plating core-shell particles silver hollow microsphere electromagnetic shielding

Electrorheological Properties of Suspensions of PAn-PEO-PAn Triblock Copolymer particles

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Journal of Wuhan University of Technology(Materials Science) 2005年第4期20卷 43-45页

作者：马会茹 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The PAn-PEO-PAn triblock copolymer with the PEG chain length of 400 was synthesized by chemical oxidation copolymerization of aniline and α,ω-bis（p-aminophenyl）poly（ethylene glycol）and characterized by FT-IR and *** experimental results show that the copolymer particles are of μtypical core-shell structure after the self-assembly process in *** conductivity is much lower than that of the pure *** suspension containing 20 vol% PAn-PEO-PAn tiblock copolymer in silicone oil exhibits.a typical electrorheological （ER） effect in DC electric *** it shows a lower leakage current density than that of the pure PAn-based ER ***,the PEO shell hinders the electric hop among PANI chains and decreases the current density of ER fluids in an external electric *** the same time the interface polarity improves the ER effects.

关键词： PAn-PEO-PAn triblock copolymer core-shell particles ER properties