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yolk shell nanoparticles

Ali Balati, Sumeyra Tek, Kelly Nash, Heather Shipley
Different morphologies and crystal phases of black titanium dioxide (TiO2 ) were synthesized using Pulsed Laser Ablation in Liquid (PLAL). The synthesized laser modified black TiO2 (LMB-TiO2 ) structures included hydrogenated anatase TiO2 nanoparticles, as the core shell structures, and TiO2 microspheres. TiO2 core-shell nanoparticles, which had crystalline-disordered structures, demonstrated the laser ablation pulse duration-dependence growth of amorphous shells and hence formation of disordered TiO2 nanoparticles with different thickness of hydrogen-doped amorphous shells were shown...
January 22, 2019: Journal of Colloid and Interface Science
Goldie Oza, Kaligotla Krishnajyothi, Victor Ishrayelu Merupo, Karen A Chavez Bracamontes, Pedro Chavez Olmos, Efrain Garrido, S Velumani, M Sridharan, Ashutosh Sharma, L G Arriaga, Jose Tapia Ramirez
Seed-mediated Gold-Iron oxide yolk-shell nanoparticles (YSNPs) were synthesized and functionalized with cy5 attached- thiolated single strand DNA probe for the detection of mutated DNA. The optimum concentration of thiolated DNA determined from a bathochromic shift of surface plasmon resonance (SPR) peak, was 0.177μM. The effect of pH (2-10), temperature (4, 37, 60 and 100 °C), and ionic strengths (1 M to 4 M) on the stability of ssDNA probe tethered YSNPs, studied with the assistance of flocculation parameter...
January 7, 2019: Colloids and Surfaces. B, Biointerfaces
Quoc Cuong Do, Do-Gun Kim, Seok-Oh Ko
Encapsulating magnetic nanoparticles in a silica shell is a promising approach in many research fields. We recently demonstrated that the magnetic yolk-shell structure of Fe3 O4 @SiO2 , which consists of an inner magnetite core and outer silica shell separated by a hollow void space, and its modified counterparts can be used as an effective catalyst for removal of acetaminophen in a heterogeneous Fenton-like reaction. The present study develops this approach further in an effort to design an effective procedure for preparing an optimum yolk-shell structure capable of greater catalytic performance...
January 10, 2019: Environmental Research
Wenling Jiao, Chen Chen, Wenbin You, Jie Zhang, Jiwei Liu, Renchao Che
A yolk-shell Fe/Fe4 N@Pd/C (FFPC) nanocomposite is synthesized successfully by two facile steps: interfacial polymerization and annealing treatment. The concentration of Pd2+ is the key factor for the density of Pd nanoparticles (Pd NPs) embedded in the carbon shells, which plays a role in the oxygen reduction reaction (ORR) and surface-enhanced Raman scattering (SERS) properties. The ORR and SERS performances of FFPC nanocomposites under different concentrations of PdCl2 are investigated. The optimal ORR performance exhibits that onset potential and tafel slope can reach 0...
January 16, 2019: Small
Kaixun Cui, Wanfu Zhong, Lingyun Li, Zanyong Zhuang, Liuyi Li, Jinhong Bi, Yan Yu
Yolk-shell nanoreactors have received considerable interest for use in catalysis. However, the controlled synthesis of continuous crystalline shells without imperfections or cracks remains challenging. Here, a strategy for the synthesis of yolk-shell metal nanoparticles@covalent organic framework (MNPs@COF) nanoreactors by using MNPs@ZIF-8 core-shell nanostructures as a self-template is designed and developed. The COF shell is formed through an amorphous-to-crystalline transformation process of a polyimine shell in a mildly acidic solution, while the ZIF-8 is etched in situ, generating a void space between the MNPs core and the COF shell...
December 13, 2018: Small
Ziming Yang, Hong-Hui Wu, Zhiming Zheng, Yong Cheng, Pei Li, Qiaobao Zhang, Ming-Sheng Wang
One of the crucial challenges for applying Sn as an anode of lithium-ion batteries (LIBs) is the dramatic volume change during lithiation/delithiation process, which causes a rapid capacity fading and then deteriorated battery performance. To address this issue, herein, we report the design and fabrication of Sn encapsulated carbon nanoboxes (denoted as Sn@C) with yolk@shell architectures. In this design, the carbon shell can facilitate the good transport kinetics whereas the hollow space between Sn and carbon shell can accommodate the volume variation during repeated charge/discharge process...
2018: Frontiers in Chemistry
Feng Chen, Shreya Goel, Sixiang Shi, Todd E Barnhart, Xiaoli Lan, Weibo Cai
Multifunctional yolk/shell-structured hybrid nanomaterials have attracted increasing interest as theranostic nanoplatforms for cancer imaging and therapy. However, because of the lack of suitable surface engineering and tumor targeting strategies, previous research has focused mainly on nanostructure design and synthesis with few successful examples showing active tumor targeting after systemic administration. In this study, we report the general synthetic strategy of chelator-free zirconium-89 (89 Zr)-radiolabeled, TRC105 antibody-conjugated, silica-based yolk/shell hybrid nanoparticles for in vivo tumor vasculature targeting...
September 2018: Nano Research
Maozhong Sun, Tiantian Hao, Xiaoyun Li, Aihua Qu, Liguang Xu, Changlong Hao, Chuanlai Xu, Hua Kuang
The interactions between chiral nanomaterials and organisms are still challenging and mysterious. Here, a chiral nanodevice made of yolk-shell nanoparticles tetrahedron (UYTe), centralized with upconversion nanoparticles (UCNPs), was fabricated to induce autophagy in vivo. The proposed chiral nanodevice displayed a tunable circular dichroism (CD) signal when modified with different enantiomers of glutathione (GSH). Notably, UYTe showed significant chirality-dependent autophagy-inducing ability after D-GSH-modification because the enhanced oxidative stress and accumulation in living cell...
October 29, 2018: Nature Communications
Xueyan Liu, Dan Xu, Qiong Wang, Lei Zhang
The search for earth-abundant, low-cost, recyclable, multifunctional as well as highly active catalysts remains the most pressing demand for heterogeneous catalytic elimination of pollutants in water environment remediation. Herein, a porous graphitic carbon-encapsulated Ni nanoparticles (NPs) hybrid (Ni@GC) is designed/constructed by direct pyrolysis of a Ni-based metal-organic framework (MOF) in N2 . The resulting Ni@GC exhibits a unique 3D hierarchical byttneria aspera-like yolk-shell structure with a high surface area, abundant active sites as well as good microwave (MW)-absorbing performance...
October 24, 2018: Small
Jin Xu, Datao Tu, Wei Zheng, Xiaoying Shang, Ping Huang, Yao Cheng, Yuansheng Wang, Xueyuan Chen
Homogeneous core-shell structured nanoparticles (NPs) are prevailingly designed to accommodate lanthanide emitters, and such an epitaxial shell deposited on core NP is generally believed to help eliminate surface traps or defects on the as-prepared core. However, upon electron-beam irradiation to core-shell-shell NaLuF4 :Gd/Yb/Er@NaLuF4 :Nd/Yb@NaLuF4 upconversion NPs (UCNPs), it is revealed that interfacial defects actually exist at the core-shell and shell-shell interfaces, even with a higher density than the bulk-phase defects in inner core...
October 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Maozhong Sun, Aihua Qu, Changlong Hao, Xiaoling Wu, Liguang Xu, Chuanlai Xu, Hua Kuang
Heterodimers of upconversion nanoparticles (UCNPs) and gold yolk-shell nanoparticles are fabricated for the quantification of polymyxin-B-resistant Escherichia coli. They produce two signals, circular dichroism (CD) and upconversion luminescence (UCL). Interestingly, due to the different affinity of polymyxin B for sensitive and resistant strain, as the concentration of polymyxin B increases, the amount of UCNPs in sensitive bacteria increases sharply, increasing the intracellular UCL signal at a low polymyxin B concentration immobilized on the UCNP...
October 15, 2018: Advanced Materials
Hongyu Zhao, Siyu Yao, Mengtao Zhang, Fei Huang, Qikui Fan, Shumeng Zhang, Hongyang Liu, Ding Ma, Chuanbo Gao
Ultra-small platinum nanoparticles loaded over titania is a promising catalyst for the low-temperature water-gas shift (WGS) reaction and shows the potential to work in a mobile hydrogen fuel cell system. Their precise size engineering (<3 nm) and reliable stabilization remain challenging. To address these issues, we report a reverse-micelle synthesis approach, which affords uniform ultra-small platinum nanoparticles (tunable in ∼1.0-2.6 nm) encapsulated in hollow titania nanospheres with a shell thickness of only ∼3-5 nm and an overall diameter of only ∼32 nm...
October 31, 2018: ACS Applied Materials & Interfaces
Zhaogang Teng, Wei Li, Yuxia Tang, Ahmed Elzatahry, Guangming Lu, Dongyuan Zhao
Hollow periodic mesoporous organosilicas (PMOs) with molecularly homogeneous organic functional groups in the inorganic pore walls are attracting more and more attention due to the high surface areas, tunable pore sizes, low densities, large cavities in the center, permeable thin shells, and versatile organic-inorganic hybrid frameworks, which make them promising in a variety of applications including adsorption, catalysis, drug delivery, and nanotheranostics. Herein, recent advances in the synthesis of hollow PMO nanoparticles with various organic moieties are summarized, and the mechanism and new insights of synthesis approaches, including hard-core templating methods, liquid-interface assembly methods, and the interfacial reassembly and transformation strategy are discussed in-depth...
October 4, 2018: Advanced Materials
Raquel O Rodrigues, Giovanni Baldi, Saer Doumett, Lorena Garcia-Hevia, Juan Gallo, Manuel Bañobre-López, Goran Dražić, Ricardo C Calhelha, Isabel C F R Ferreira, Rui Lima, Helder T Gomes, Adrián M T Silva
The synthesis of hydrophilic graphene-based yolk-shell magnetic nanoparticles functionalized with copolymer pluronic F-127 (GYSMNP@PF127) is herein reported to achieve an efficient multifunctional biomedical system for mild hyperthermia and stimuli-responsive drug delivery. In vitro tests revealed the extraordinary ability of GYSMNP@PF127 to act as smart stimuli-responsive multifunctional nanomedicine platform for cancer therapy, exhibiting (i) an outstanding loading capacity of 91% (w/w, representing 910 μg mg-1 ) of the chemotherapeutic drug doxorubicin, (ii) a high heating efficiency under an alternating (AC) magnetic field (intrinsic power loss ranging from 2...
December 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Jian Zhao, Wenjing Li, Linpeng Fan, Quan Quan, Jinfeng Wang, Changfa Xiao
A nagging problem for the decompostion of photocatalyst organic carrier can be expected to be resolved by shielding effect from our yolk-porous shell nanospheres. The nanospheres were synthesized by a facile strategy: polyporrole (PPy) and silver were deposited together on TiO2 by chemical oxidative polymerization; then PPy/Ag-coated TiO2 nanoparticles were encapsulated in silicon dioxide (SiO2 ) shell with polyethylene glycol (PEG) as a pore-forming agent via sol-gel method based on hydrolysis of tetraethyl orthosilicate (TEOS)...
January 15, 2019: Journal of Colloid and Interface Science
Qingqing Wang, Wei Luo, Xinqi Chen, Jianwei Fan, Weizhong Jiang, Lianjun Wang, Wan Jiang, Wei-Xian Zhang, Jianping Yang
All-in-one architectures in which uniform nanoscale zero-valent iron nanoparticles are wrapped in hollow porous carbon shells are highly desirable for environmental applications such as wastewater treatment and for use as catalysts, but their preparation remains a significant challenge. Herein, a spatially confined strategy for the in situ preparation of uniform Fe0 @mC (mC=micro/mesoporous carbon) yolk-shell nanospheres, in which the iron nanoparticles are encapsulated in thin, porous carbon shells, is reported...
October 17, 2018: Chemistry: a European Journal
Xiangyang Cheng, Dejian Li, Aiqi Lin, Jun Xu, Liang Wu, Huijie Gu, Zhongyue Huang, Jiangyi Liu, Yiming Zhang, Xiaofan Yin
Introduction: For an ideal drug delivery system, the outstanding drug-loading capacity and specific control of the release of therapeutics at the desired lesions are crucial. In this work, we developed a triple-responsive nanoplatform based on copper sulfide (CuS)-capped yolk-shell-structured periodic mesoporous organosilica nanoparticles (YSPMOs) for synergetic chemo-photothermal therapy. Methods: Herein, the YSPMOs were employed as a drug carrier, which exhibited a high doxorubicin (DOX) loading capacity of 386 mg/g...
2018: International Journal of Nanomedicine
Jing Xu, Xiaoxiao Wang, Zhaogang Teng, Guangming Lu, Nongyue He, Zhifei Wang
Herein, we fabricated a new yolk-shell-structured mesoporous silica nanoparticle (YMSN) with multifunctionalities of fluorescence imaging, photothermal therapy (PTT), and drug delivery by using a fluorescein isothiocyanate-doped silica nanoparticle partially covered by patchy gold as the core. Different from the conventional selective etching procedure, the multifunctional silica core is left intact, and the alkali etching mainly occurs in a hexadecyl trimethyl ammonium bromide/silica hybrid layer, which leads to the formation of the void space in YMSNs...
July 25, 2018: ACS Applied Materials & Interfaces
Jian Jiang, Han Zhang, Jianhui Zhu, Linpo Li, Yani Liu, Ting Meng, Lai Ma, Maowen Xu, Jinping Liu, Chang Ming Li
Practical utilization of silicon (Si) for Li-ion batteries (LIBs) still remains sluggish because of its formidable kinetic problems of huge volume expansions over 300%, instable solid electrolyte interphase (SEI), and unsatisfactory electrical conductivity. Though using a yolk-shell (Y-S) Si@C nanodesign indeed helps to mitigate active changes, optimize SEI properties, and lower intrinsic charge-transfer impedances, the total anodic behaviors in reversibility, rate capabilities, and long-lasting cyclability are still far from perfect...
July 18, 2018: ACS Applied Materials & Interfaces
Jian Lv, Chuncai Kong, Ke Liu, Lu Yin, Bo Ma, Xiaojing Zhang, Sen Yang, Zhimao Yang
Pt decorated yolk-shell Cu2O cubes are obtained using a surfactant-free and multiple-step method. Porous yolk-shell cubic structures, together with synergistic effects between Pt and Cu2O, endow the yolk-shell Pt-Cu2O based nonenzymatic H2O2 sensors with enhanced sensing performance.
July 26, 2018: Chemical Communications: Chem Comm
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