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Paolo Armanetti, Salvador Pocoví-Martínez, Alessandra Flori, Cinzia Avigo, Domenico Cassano, Luca Menichetti, Valerio Voliani
Ultrasound (US) imaging is a well-established diagnostic technique to image soft tissues in real time, while photoacoustic (PA) is an emerging imaging technique employed to collect molecular information. Integration of PA and US imaging provides complementary information enhancing diagnostic accuracy without employing ionizing radiations. The development of contrast agents able to combine PA and US features is pivotal to improve the significance of PAUS imaging and for PAUS-guided treatment of neoplasms. Here, we demonstrate in relevant ex-vivo models that disassembling passion fruit-like nano-architectures (pfNAs) can be employed in PAUS imaging...
May 17, 2018: Nanomedicine: Nanotechnology, Biology, and Medicine
Linxu Xu, Fang Cui, Jiajia Zhang, Xiao Zhang, Yan Wang, Tieyu Cui
A facile and efficient approach for the synthesis of metal ions@silica nanospheres is proposed by using an intramolecular autocatalytic route. By the rational selection of reactants, metal ions@silica nanospheres can be obtained via successive spontaneous reactions under near neutral conditions. After thermal treatment, spherical silica equipped with ultrasmall and highly dispersed metal oxides nanoparticles was obtained.
May 16, 2018: Nanoscale
Tomasz Grzyb, Dominika Przybylska
Ultrasmall (9-30 nm) Yb3+ /Er3+ -doped, upconverting alkaline rare-earth fluorides that are promising for future applications were synthesized by the microwave-assisted hydrothermal method. The formation mechanism was proposed, indicating the influence of the stability of metal ions complexes with ethylenediaminetetraacetic acid on the composition of the product and tendency to form M2 REF7 (M0.67 RE0.33 F2.33 ) cubic compounds in the M-RE-F systems. Their physicochemical properties (structure, morphology, and spectroscopic properties) are compared and discussed...
May 14, 2018: Inorganic Chemistry
Mathew T Hembury, Nataliia Beztsinna, Hamed Asadi, Joep van den Dikkenberg, Johannes D Meeldijk, Wim E Hennink, Tina Vermonden
Ultrasmall gold atom clusters (< 2 nm in diameter) or gold nanoclusters exhibit emergent photonic properties (near-infrared absorption and emission) compared to larger plasmonic gold particles, due to the significant quantization of their conduction band. While single gold nanoclusters properties and applications are being increasingly investigated, little is still known about their behaviour and properties when assembled into suprastructures and even less studies are investigating their use for biomedical applications...
May 11, 2018: Biomacromolecules
E D Lehrman, A N Plotnik, T Hope, D Saloner
Ferumoxytol is a promising non-gadolinium-based contrast agent with numerous varied magnetic resonance imaging applications. Previous reviews of vascular applications have focused primarily on cardiac and aortic applications. After considering safety concerns and technical issues, the objective of this paper is to explore peripheral applications for ferumoxytol-enhanced magnetic resonance angiography (MRA) and venography (MRV) in the upper and lower extremities. Separate searches for each of the following keywords were performed in pubmed: "ferumoxytol," "ultrasmall superparamagnetic iron oxide," and "USPIO...
May 3, 2018: Clinical Radiology
Bao-Hua Hou, Ying-Ying Wang, Jin-Zhi Guo, Qiu-Li Ning, Xiao-Tong Xi, Wei-Lin Pang, An-Min Cao, Xinlong Wang, Jing-Ping Zhang, Xing-Long Wu
In order to develop promising anode materials for sodium-ion batteries (SIBs), a novel pie-like FeS@C (P-FeS@C) nanohybrid, in which all ultrasmall FeS nanocrystals (NCs) are completely embedded into the carbon network and sealed by a protective carbon shell, has been prepared. The unique pie-like structure can effectively speed up the kinetics of electrode reactions, while the carbon shell stabilizes the FeS NCs inside. Studies show that the electrochemical reaction processes of P-FeS@C electrodes are dominated by the pseudocapacitive behavior, leading to an ultrafast Na+-insertion/extraction reaction...
May 4, 2018: Nanoscale
Gandhi Alagappan, Ching Eng Png
When we combine two periodic dielectric functions of slightly different spatial frequencies, we have spatial dielectric beats, which are periodic supercells in the longer spatial scale. This paper investigates these dielectric beats by solving the one-dimensional Maxwell's equation using a slowly varying envelope approximation. We show that the Maxwell's equation reduces to a three-term recurrence relation, leading to a tridiagonal eigenvalue problem with a dense number of eigenmodes with ultrasmall dispersions...
May 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Chunlei Zhang, Amin Zhang, Wenxiu Hou, Tianliang Li, Kan Wang, Qian Zhang, Jesús M De La Fuente, Weilin Jin, Daxiang Cui
Biological systems provide the richest spectrum of sophisticated design for materials engineering. We herein provide a paradigm of Au22 (SG)18 -(SG, glutathione thiolate)-engineered and hydrogen bonds engaged assemblies for mimicking capsid protein self-assembly. The water-evaporation-induced self-assembly method allows discrete ultrasmall gold nanoclusters (GNCs) to be self-assembled into super-GNCs assemblies (SGNCs) ranging from nano-, meso- to microscale in water-dimethylsulfoxide binary solvents in a template-free manner...
May 3, 2018: ACS Nano
Gabriella Dravecz, Tibor Z Jánosi, Dávid Beke, Dániel Á Major, Gyula Károlyházy, János Erostyák, Katalin Kamarás, Ádám Gali
Ultrasmall silicon carbide nanoparticles (SiC USNPs) are very promising biomarkers for developing new applications in diagnostics, cell monitoring or drug delivery, even though their interaction with biological molecules such as different proteins has not yet been investigated in detail. In this study, the biological behaviour of SiC USNPs in a medium modeling a living organism was investigated in detail through the dependence of the fluorescence on interactions between bovine serum albumin (BSA) and SiC USNPs...
May 3, 2018: Physical Chemistry Chemical Physics: PCCP
Artur Glavic, Brock Summers, Ashutosh Dahal, Joseph Kline, Walter Van Herck, Alexander Sukhov, Arthur Ernst, Deepak K Singh
The nature of magnetic correlation at low temperature in two-dimensional artificial magnetic honeycomb lattice is a strongly debated issue. While theoretical researches suggest that the system will develop a novel zero entropy spin solid state as T → 0 K, a confirmation to this effect in artificial honeycomb lattice of connected elements is lacking. This study reports on the investigation of magnetic correlation in newly designed artificial permalloy honeycomb lattice of ultrasmall elements, with a typical length of ≈12 nm, using neutron scattering measurements and temperature-dependent micromagnetic simulations...
April 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Meiying Wu, Wenting Chen, Yu Chen, Haixian Zhang, Chengbo Liu, Zhiting Deng, Zonghai Sheng, Jingqin Chen, Xin Liu, Fei Yan, Hairong Zheng
The blood brain barrier is the main obstacle to delivering diagnostic and therapeutic agents to the diseased sites of brain. It is still of great challenge for the combined use of focused ultrasound (FUS) and theranostic nanotechnology to achieve noninvasive and localized delivery of chemotherapeutic drugs into orthotopic brain tumor. In this work, a unique theranostic nanoplatform for highly efficient photoacoustic imaging - guided chemotherapy of brain tumor both in vitro and in vivo, which is based on the utilization of hollow mesoporous organosilica nanoparticles (HMONs) to integrate ultrasmall Cu2- x Se particles on the surface and doxorubicin inside the hollow interior, is synthesized...
April 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Zongnan Deng, Hao Jiang, Chunzhong Li
2D metal chalcogenides have become a popular focus in the energy storage field because of their unique properties caused by their single-atom thicknesses. However, their high surface energy and van der Waals attraction easily cause serious stacking and restacking, leading to the generation of more inaccessible active sites with rapid capacity fading. The hybridization of 2D metal chalcogenides with highly conductive materials, particularly, incorporating ultrasmall and few-layered metal chalcogenides into carbon frameworks, can not only maximize the exposure of active sites but also effectively avoid their stacking and aggregation during the electrochemical reaction process...
April 30, 2018: Small
Alvaro Rafael Muñoz-Castro, Jean-Yves Saillard
Exploring the versatility of atomically precise clusters is a relevant issue in the design of functional nanostructures. Superatomic clusters offers an ideal framework to gain further understanding of the different distinctive size-dependent physical and chemical properties. Here, we propose [Au12(SR)6]2- as a minimal 8-electron superatom related to the prototypical [Au25(SR)18]- cluster, depicting half of its core-mass (2.3 kDa vs 5.0 kDa). The [Au12(SMe)6]2- cluster fulfills a 1S2 1P6 electronic configuration, with a distorted tetrahedral Au8 core further viewed as an SP3-hybridized superatom...
April 26, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Linfeng Liang, Luyao Liu, Feilong Jiang, Caiping Liu, Daqiang Yuan, Qihui Chen, Dong Wu, Hai-Long Jiang, Maochun Hong
Considering rapidly rising Hg emission from industrial waste effluents, it is imperative to explore practical and effective adsorbents for Hg. Herein, a mild and facile method has been developed to confine ultrasmall In2 S3 nanoparticles (about 2.5 nm) in the cavities of a MOF for the first time. The resulting composite (In2 S3 @MIL-101) can remove 99.95% of the Hg2+ from wastewater very efficiently in as short as 1 min with the highest distribution coefficient (2.2 × 107 mL g-1 ) among all MOF-based mercury adsorbents...
April 25, 2018: Inorganic Chemistry
Shanti Marasini, Tirusew Tegafaw, Xu Miao, Son Long Ho, Hyunsil Cha, Yongmin Chang, In Taek Oh, Kwon Seok Chae, Ahmad Mohammad Yaseen, Adibehalsadat Ghazanfari, Yue Huan, Gang Ho Lee
D-glucuronic acid-coated ultrasmall chromium oxide (Cr2O3) nanoparticles were synthesized by a one-pot polyol method and their relaxometric and optical properties were investigated. The as-synthesized D-glucuronic acid-coated nanoparticles were amorphous owing to ultrasmall particle diameters (davg = 2.0 nm), whereas orthorhombic Cr2O3 nanoparticles with two size groups (davg = 3.6 and 5.7 nm) were observed after thermogravimetric analysis (900 °C) as a result of particle growth. The nanoparticles exhibited size-dependent UV-visible absorption maxima at 238, 274, and 372 nm with increasing particle diameter, corresponding to band gaps of 5...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Hao Huang, Lizhen He, Wenhua Zhou, Guangbo Qu, Jiahong Wang, Na Yang, Jie Gao, Tianfeng Chen, Paul K Chu, Xue-Feng Yu
X-ray induced photodynamic therapy (X-ray-PDT) is a promising approach for synergistic cancer radiotherapy and development of suitable radiosensitizers is highly desired. In this paper, we propose black phosphorus/Bi2 O3 (BP/Bi2 O3 ) heterostructures as efficient and biocompatible radiosensitizers for synergistic cancer radiotherapy. The heterostructures are synthesized by growth of ultrasmall Bi2 O3 nanoparticles onto BP nanosheets. The Bi2 O3 decoration inhibits the rapid degradation of BP nanosheets by occupation of the defect sites, and the synergistic effects of BP and Bi2 O3 enable 1 O2 overproduction under X-ray irradiation...
April 13, 2018: Biomaterials
Shan-Shan Zhang, Lei Feng, Ravithree D Senanayake, Christine M Aikens, Xing-Po Wang, Quan-Qin Zhao, Chen-Ho Tung, Di Sun
Due to distinctive quantum confinement effects, ultrasmall gold nanoparticles usually exhibit interesting electronic structure and molecular-like properties. However, the lack of atomically-precise structural information makes the understanding of them almost impossible, such as understanding the relationships between their compositions and unique properties. Herein, by reducing a diphosphine AuI precursor (Au2 (dppm)2 Cl2 ; dppm = Ph2 PCH2 PPh2 ) with or without a S2- releasing reagent, we enriched our knowledge of the members in the families of Au13 and Au8 by the structural determinations of two new dppm-protected gold nanoclusters, [Au13 (dppm)6 ]5+ ( SD/Au1 ) and [Au8 (dppm)4 S2 ]2+ ( SD/Au2 ), respectively...
February 7, 2018: Chemical Science
Wenyun Liao, Li Zhang, Yunhua Zhong, Yuan Shen, Changlin Li, Na An
Introduction: The consolidation of different therapies into a single nanoplatform has shown great promise for synergistic tumor treatment. In this study, a multifunctional platform by WS2 quantum dots (WQDs)-coated doxorubicin (DOX)-loaded periodic mesoporous organosilicas (PMOs-DOX@WQDs) nanoparticles were fabricated for the first time, and which exhibits good potential for synergistic chemo-photothermal therapy. Materials and methods: The structure, light-mediated drug release behavior, photothermal effect, and synergistic therapeutic efficiency of PMOs-DOX@WQDs to HCT-116 colon cancer cells were investigated...
2018: OncoTargets and Therapy
Bo Weng, Kang-Qiang Lu, Zichao Tang, Hao Ming Chen, Yi-Jun Xu
Recently, loading ligand-protected gold (Au) clusters as visible light photosensitizers onto various supports for photoredox catalysis has attracted considerable attention. However, the efficient control of long-term photostability of Au clusters on the metal-support interface remains challenging. Herein, we report a simple and efficient method for enhancing the photostability of glutathione-protected Au clusters (Au GSH clusters) loaded on the surface of SiO2 sphere by utilizing multifunctional branched poly-ethylenimine (BPEI) as a surface charge modifying, reducing and stabilizing agent...
April 18, 2018: Nature Communications
Xuhui Ning, Chuanqi Peng, Eric S. Li, Jing Xu, Rodrigo D. Vinluan III, Mengxiao Yu, Jie Zheng
No abstract text is available yet for this article.
May 2017: APL Materials
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