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yolk shell nanoparticles

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 8, 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)...
September 17, 2018: 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...
August 16, 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
Xue Wang, Yapeng He, Yali Ma, Junmin Liu, Yunling Liu, Zhen-An Qiao, Qisheng Huo
We report the design and realization of yolk-shell structured nanospheres with periodic mesoporous organosilica (PMO) nanospheres or noble metal nanoparticles encapsulated in mesoporous silica shells via a selective etching method. These architectures have well controlled structure, size and morphology. The yolk-shell structured PMO@SiO2 nanoparticles can be precisely functionalized with different catalytic functionalities, even incompatible acidic and basic groups: the PMO core with amino (-NH2) groups and the mesoporous silica shell with sulfonic acid (-SO3H) groups...
July 10, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yuxia Pei, Menghuan Li, Yanhua Hou, Yan Hu, Guangyu Chu, Liangliang Dai, Ke Li, Yuxin Xing, Bailong Tao, Yonglin Yu, Chencheng Xue, Ye He, Zhong Luo, Kaiyong Cai
The precise tumor cell-specific delivery of therapeutic proteins and the elimination of side effects associated with routine chemotherapeutic agents are two current critical considerations for tumor therapy. In this study, we report a reactive oxygen species (ROS)-activated yolk-shell nanoplatform for the tumor-specific co-delivery of cytochrome c (Cyt c) prodrug and doxorubicin, in which the bioactivity of Cyt c could be restored by the intracellular ROS-trigger and readily initiate the sequential doxorubicin release...
June 21, 2018: Nanoscale
Xiaowei Cheng, Haochen Zhao, Wenfeng Huang, Jinyang Chen, Shixia Wang, Junping Dong, Yonghui Deng
In this study, an interface coassembly strategy is employed to rationally synthesize a yolk-shell CuO/silicalite-1@void@mSiO2 composite consisting of silicalite-1 supported CuO nanoparticles confined in the hollow space of mesoporous silica, and the obtained composite materials were used as a novel nonenzymatic biosensor for highly sensitive and selective detecting glucose with excellent anti-interference ability. The synthesis of CuO/silicalite-1@mSiO2 includes four steps: coating silicalite-1 particles with resorcinol-formaldehyde polymer (RF), immobilization of copper species, interface deposition of a mesoporous silica layer, and final calcination in air to decompose RF and form CuO nanoparticles...
July 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jiating Xu, Wei Han, Ziyong Cheng, Piaoping Yang, Huiting Bi, Dan Yang, Na Niu, Fei He, Shili Gai, Jun Lin
Developing nanotheranostics responsive to tumor microenvironments has attracted tremendous attention for on-demand cancer diagnosis and treatment. Herein, a facile Mn-doping strategy was adopted to transform mesoporous silica coated upconversion nanoparticles (UCNPs) to yolk-like upconversion nanostructures which possess a tumor-responsive biodegradation nature. The huge internal space of the innovated nanocarriers is suitable for doxorubicin (DOX) storage, besides, the Mn-doped shell is sensitive to the intratumoral acidity and reducibility, which enables shell biodegradation and further accelerates the breakage of Si-O-Si bonds within the silica framework...
March 28, 2018: Chemical Science
Jun Tao, Meng Dang, Xiaodan Su, Qing Hao, Junjie Zhang, Xiaobo Ma, Guangming Lu, Yunlei Zhang, Ying Tian, Lixing Weng, Zhaogang Teng, Lianhui Wang
In the work, yolk-shell structured mesoporous organosilica nanoparticles (YSMONs) are successfully prepared by a mild alkalescent etching approach. The method is very convenient, in which mesostructured organosilica nanospheres are directly transformed into yolk-shell structures after etching with mild alkalescent solution (e.g. sodium carbonate solution). The prepared YSMONs have ethane-bridged frameworks, a monodisperse diameter (320 nm), a large pore volume (1.0 cm3  g-1 ), a uniform mesopore (2.4 nm) and a high surface area (1327 m2  g-1 )...
October 1, 2018: Journal of Colloid and Interface Science
Yonghoon Hong, In Ae Choi, Won Seok Seo
We have developed a highly stable and magnetically recyclable yolk-shell nanocatalyst for catalytic reduction of nitroaromatics. This nanocatalyst is composed of a ~13 nm Au nanoparticle encapsulated in a hollow mesoporous carbon (hmC) shell with a diameter of ~120 nm and a thickness of ~15 nm. The hmC shell contains ~6 nm FeCo/graphitic carbon shell (FeCo/GC) nanoparticles. We have synthesized the Au@hmC-FeCo/GC nanocatalyst by thermal decomposition of Fe and Co precursors in silica of a solid core/mesoporous shell structure containing a Au nanoparticle within the core, subsequent ethylene chemical vapor deposition (CVD), and then removal of the silica by treatment with aqueous HF...
May 10, 2018: Scientific Reports
Ri Yu, Gye Seok An, Jae-Hwan Pee, YooJin Kim
In this study, we synthesized a core/yolk-shell α-Fe2O3@SiO2 structure by treatment of SiO2 shell with mild basic solution. Spindle shaped α-Fe2O3 nanoparticles were initially prepared as core materials and subsequently coated with silica via sol-gel method. The yolk shell of α-Fe2O3 was produced by dissolution of silica shell from core-shell type hematite in NH4OH solution. In addition, the correlation between the density and morphology of the silica coating layer and the chromaticity according to the NH4OH concentration and the etching time was confirmed...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Ling Yin, Shuang Song, Xiangxue Wang, Fenglei Niu, Ran Ma, Shujun Yu, Tao Wen, Yuantao Chen, Tasawar Hayat, Ahmed Alsaedi, Xiangke Wang
The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (Fe3 O4 @TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic Fe3 O4 @TNS nanosheets had high specific areas (114.9 m2  g-1 for core-shell Fe3 O4 @TNS and 130.1 m2  g-1 for yolk-shell Fe3 O4 @TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment...
July 2018: Environmental Pollution
Jian Liu, Tingting Liu, Jian Pan, Shaomin Liu, G Q Max Lu
Mesoporous silica nanoparticles (MSNs) are promising functional nanomaterials for a variety of biomedical applications, such as bioimaging, drug/gene delivery, and cancer therapy. This is due to their low density, low toxicity, high biocompatibility, large specific surface areas, and excellent thermal and mechanical stability. The past decade has seen rapid advances in the development of MSNs with multiple compartments. These include hierarchical porous structures and core-shell, yolk-shell, and Janus structured particles for efficient diagnosis and therapeutic applications...
June 7, 2018: Annual Review of Chemical and Biomolecular Engineering
Bo Li, Jian-Gong Ma, Peng Cheng
The integration of metal/metal oxide nanoparticles (NPs) into metal-organic frameworks (MOFs) to form composite materials has attracted great interest due to the broad range of applications. However, to date, it has not been possible to encapsulate metastable NPs with high catalytic activity into MOFs, due to their instability during the preparation process. For the first time, we have successfully developed a template protection-sacrifice (TPS) method to encapsulate metastable NPs such as Cu2 O into MOFs. SiO2 was used as both a protective shell for Cu2 O nanocubes and a sacrificial template for forming a yolk-shell structure...
June 4, 2018: Angewandte Chemie
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