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Hongda Chen, Xiaodong Li, Fuyao Liu, Huimao Zhang, Zhenxin Wang
The effective delivery of bioimaging probes to a selected cancerous tissue has extensive significance for biological studies and clinical investigations. Herein, the peptide functionalized NaGdF4 nanodots (termed as, pPeptide-NaGdF4 nanodots) have been prepared for highly efficient magnetic resonance imaging (MRI) of tumor by formation of Gd-phosphonate coordinate bonds among hydrophobic NaGdF4 nanodots (4.2 nm in diameter) with mixed phosphorylated peptide ligands including a tumor targeting phosphopeptide and a cell penetrating phosphopeptide...
July 20, 2017: Molecular Pharmaceutics
Linfeng Wang, Xiang Zhou, Tianbao Ma, Dameng Liu, Lei Gao, Xin Li, Jun Zhang, Yuanzhong Hu, Hui Wang, Yadong Dai, Jianbin Luo
Graphene and other two-dimensional materials have been proved to be able to offer low friction. Here we assembled van der Waals heterostructures with graphene and molybdenum disulphide monolayers. The Raman spectrum together with a modified linear chain model indicate a two-orders-of-magnitude decrease in the interlayer lateral force constant, as compared with their homogeneous bilayers, indicating a possible routine to achieve superlubricity. The decrease in the interlayer lateral force constant is consistent with the ultrasmall potential energy corrugation during sliding, which is derived from density functional theory calculations...
July 20, 2017: Nanoscale
Lisiqi Xie, Xiao Huang, Bin Su
A portable amperometric ion sensor was fabricated by integrating silica isoporous membrane (SIM) and organogel composed of polyvinyl chloride and 1,2-dichloroethane (PVC-DCE) on a 3D-printed polymer chip. The detection of ionic species in aqueous samples could be accomplished by adding a microliter of sample droplet to the sensor and by identifying the ion-transfer potential and current magnitude at the water/organogel interface array templated by SIM. Thanks to the ultrasmall channel size (2-3 nm in diameter), high channel density (4 × 10(8) μm(-2)), and ultrathin thickness (80 nm) of SIM, the ensemble of nanoscopic water/organogel (nano-W/Gel) interface array behaved like a microinterface with two back-to-back hemispherical mass diffusion zones...
June 23, 2017: ACS Sensors
The Ma Rs Study Investigators
Background -Ultrasmall superparamagnetic particles of iron oxide (USPIO) detect cellular inflammation on magnetic resonance imaging (MRI). In patients with abdominal aortic aneurysm, we assessed whether USPIO-enhanced MRI can predict aneurysm growth rates and clinical outcomes. Methods -In a prospective multicentre open-label cohort study, 342 patients with abdominal aortic aneurysm (diameter ≥40 mm) were classified by the presence of USPIO enhancement and were monitored with serial ultrasound and clinical follow-up for at least 2 years...
July 18, 2017: Circulation
Shevanuja Theivendran, Amala Dass
Ultrasmall nanomolecules (<2 nm) such as Au25(SCH2CH2Ph)18, Au38(SCH2CH2Ph)24, and Au144(SCH2CH2Ph)60 are well studied and can be prepared using established synthetic procedures. No such synthetic protocols that result in high yield products from commercially available starting materials exist for Au36(SPh-X)24. Here, we report a synthetic procedure for the large-scale synthesis of highly stable Au36(SPh-X)24 with a yield of ∼42%. Au36(SPh-X)24 was conveniently synthesized by using tert-butylbenzenethiol (HSPh-tBu, TBBT) as the ligand, giving a more stable product with better shelf life and higher yield than previously reported for making Au36(SPh)24 from thiophenol (PhSH)...
July 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Eugene T Ek, Kemble Wang
Surgical treatment of ultrasmall proximal pole scaphoid fractures poses a number of challenges. The fragment may be too small to fix with conventional headless screw fixation owing to the high risk of fragmentation upon insertion. However, excision of the fragment risks compromising the scapholunate ligament complex and also exposes the radioscaphoid joint to potential degenerative changes. Under these circumstances, we describe the use of bioabsorbable osteochondral fixation nails that allows stable low-profile fixation while minimizing the risk of fracturing the proximal pole...
July 11, 2017: Journal of Hand Surgery
Peresi Majura Bulemo, Hee-Jin Cho, Nam-Hoon Kim, Il-Doo Kim
In this work, we report the facile synthesis of thin-walled SnO2 nanotubes (NTs) with numerous clustered pores (pore radius 6.56 nm) and high surface area (125.63 m2/g) via selective etching of core (SiO2) region in SiO2-SnO2 composite nanofibers (NFs), in which SnO2 phase preferentially occupies the shell while SiO2 is concentrated in the center of the composite NFs. The SiO2-etched SnO2 NTs are composed of ultrasmall crystallites (~6 nm in size) originating from crystal growth inhibition by small SiO2 domains, which are partially segregated in the polycrystalline SnO2 shell during calcination...
July 13, 2017: ACS Applied Materials & Interfaces
Günter Schmid, Wolfgang G Kreyling, Ulrich Simon
Gold nanoparticles (AuNPs) have been extensively explored in biomedical applications, for example as drug carriers, contrast agents, or therapeutics. However, AuNP can exhibit cytotoxic profile, when the size is below 2 nm (ultrasmall AuNP; usAuNP) and when the stabilizing ligands allow for access to the gold surface either for the direct interaction with biomolecules or for catalytic activity of the unshielded gold surface. Furthermore, usAuNP exhibits significantly different biodistribution and enhanced circulation times compared to larger AuNP...
July 12, 2017: Archives of Toxicology
Ruitao Cha, Juanjuan Li, Yang Liu, Yifan Zhang, Qian Xie, Mingming Zhang
Fe3O4 nanoparticles with ultrasmall sizes show good T1 or T1+T2 contrast abilities, and have attracted considerable interest in the field of magnetic resonance imaging (MRI) contrast agents. For effective biomedical applications, the colloidal stability and biocompatibility of the Fe3O4 nanoparticles need to be improved without reducing MRI relaxivity. In this paper, star polymers were used as coating materials to modify Fe3O4 nanoparticles in view of their dense molecular architecture with moderate flexibility...
June 30, 2017: Colloids and Surfaces. B, Biointerfaces
Navadeep Shrivastava, L U Khan, J M Vargas, Carlos Ospina, J A Q Coaquira, Giorgio Zoppellaro, H F Brito, Yasir Javed, D K Shukla, M C F C Felinto, Surender K Sharma
Luminescence-tunable multicolored LaF3:xCe(3+),xGd(3+),yEu(3+) (x = 5; y = 1, 5, 10, and 15 mol%) nanoparticles have been synthesized via a low cost polyol method. Powder X-ray diffraction and high-resolution transmission electron microscopy studies confirm the hexagonal phase of the LaF3:xCe(3+),xGd(3+),yEu(3+) nanophosphors with average sizes (oval shape) ranging from 5 to 7 nm. Energy-dispersive X-ray spectroscopy analyses show the uniform distribution of Ce(3+), Gd(3+), and Eu(3+) dopants in the LaF3 host matrix...
July 11, 2017: Physical Chemistry Chemical Physics: PCCP
Masoud Mahjouri-Samani, Mengkun Tian, Alexander A Puretzky, Miaofang Chi, Kai Wang, Gerd Duscher, Christopher M Rouleau, Gyula Eres, Mina Yoon, John C Lasseter, Kai Xiao, David B Geohegan
Non-equilibrium growth pathways for crystalline nanostructures with metastable phases are demonstrated through the gas-phase formation, attachment, and crystallization of ultrasmall amorphous nanoparticles as building blocks in pulsed laser deposition (PLD). Temporally- and spatially-resolved gated-ICCD imaging and ion probe measurements are employed as in situ diagnostics to understand and control the plume expansion conditions for the synthesis of nearly pure fluxes of ultrasmall (~3 nm) amorphous TiO2 nanoparticles in background gases and their selective delivery to substrates...
July 10, 2017: Nano Letters
Thomas Reichert, Tobat P I Saragi
We present magnetoresistive organic field-effect transistors featuring ultrasmall magnetic field-effects as well as a sign reversal. The employed material systems are coevaporated thin films with different compositions consisting of the electron donor 2,2',7,7'-tetrakis-(N,N-di-p-methylphenylamino)-9,9'-spirobifluorene (Spiro-TTB) and the electron acceptor 1,4,5,8,9,12-hexaazatriphenylene hexacarbonitrile (HAT-CN). Intermolecular charge transfer between Spiro-TTB and HAT-CN results in a high intrinsic charge carrier density in the coevaporated films...
2017: Beilstein Journal of Nanotechnology
Lian Ying Zhang, Ze Liu
An effective strategy of ultrasmall and surface-clean Pd4Ir nanocrystals uniformly decorated on graphene was developed using ultrasnoic-assisted approach. The prepared Us-Pd4Ir@Graphene reduces Pd loading while holds much higher catalytic activity and better stability toward formic acid oxidation than that of commercial Pd-C, offering great promise as a superior anode catalyst for direct formic acid fuel cells.
June 27, 2017: Journal of Colloid and Interface Science
Loek P Smits, Feiko Tiessens, Kang He Zheng, Erik S Stroes, Aart J Nederveen, Bram F Coolen
BACKGROUND AND AIMS: Inflammation in atherosclerotic plaques is an important determinant of plaque vulnerability, and can be detected non-invasively using ultra-small superparamagnetic iron-oxide (USPIO) enhanced MRI. The aims of the current study were: 1) to determine whether ferumoxytol can be used for USPIO-MRI of atherosclerotic plaques, 2) to establish a protocol for quantitative USPIO-MRI of carotid artery plaques using ferumoxytol, and 3) to study the relation between USPIO uptake and plaque burden and (18)F-fluorodeoxyglucose (FDG) uptake (measured by (18)F-FDG PET/CT scan) in atherosclerotic plaques...
June 8, 2017: Atherosclerosis
Renming Liu, Zhang-Kai Zhou, Yi-Cong Yu, Tengwei Zhang, Hao Wang, Guanghui Liu, Yuming Wei, Huanjun Chen, Xue-Hua Wang
Reaching the quantum optics limit of strong light-matter interactions between a single exciton and a plasmon mode is highly desirable, because it opens up possibilities to explore room-temperature quantum devices operating at the single-photon level. However, two challenges severely hinder the realization of this limit: the integration of single-exciton emitters with plasmonic nanostructures and making the coupling strength at the single-exciton level overcome the large damping of the plasmon mode. Here, we demonstrate that these two hindrances can be overcome by attaching individual J aggregates to single cuboid Au@Ag nanorods...
June 9, 2017: Physical Review Letters
Lili Feng, Dan Yang, Fei He, Shili Gai, Chunxia Li, Yunlu Dai, Piaoping Yang
Reactive oxygen species (ROS) produced in the specific tumor site plays the key role in photodynamic therapy (PDT). Herein, a multifunctional nanoplatform is designed by absorbing ultrasmall upconversion nanoparticles (UCNPs) on mesoporous graphitic-phase carbon nitride (g-C3 N4 ) coated superparamagnetic iron oxide nanospheres, then further modified with polyethylene glycol (PEG)molecules (abbreviated as Fe3 O4 @g-C3 N4 -UCNPs-PEG). The inert g-C3 N4 layer between Fe3 O4 core and outer UCNPs can substantially depress the quenching effect of Fe3 O4 on the upconversion emission...
June 23, 2017: Advanced Healthcare Materials
Feipeng Zhao, Sida Shen, Liang Cheng, Lu Ma, Junhua Zhou, Hualin Ye, Na Han, Tianpin Wu, Yanguang Li, Jun Lu
Sodium-ion batteries are potential low-cost alternatives to current lithium-ion technology, yet their performances still fall short of expectation due to the lack of suitable electrode materials with large capacity, long-term cycling stability, and high-rate performance. In this work, we demonstrated that ultrasmall (∼5 nm) iron selenide (FeSe2) nanoparticles exhibited a remarkable activity for sodium-ion storage. They were prepared from a high-temperature solution method with a narrow size distribution and high yield and could be readily redispersed in nonpolar organic solvents...
June 28, 2017: Nano Letters
Hyeongrak Choi, Mikkel Heuck, Dirk Englund
We propose a photonic crystal nanocavity design with self-similar electromagnetic boundary conditions, achieving ultrasmall mode volume (V_{eff}). The electric energy density of a cavity mode can be maximized in the air or dielectric region, depending on the choice of boundary conditions. We illustrate the design concept with a silicon-air one-dimensional photon crystal cavity that reaches an ultrasmall mode volume of V_{eff}∼7.01×10^{-5}λ^{3} at λ∼1550  nm. We show that the extreme light concentration in our design can enable ultrastrong Kerr nonlinearities, even at the single-photon level...
June 2, 2017: Physical Review Letters
Shengtong Sun, Denis Gebauer, Helmut Cölfen
While nature exerts precise control over the size and chemical composition of minerals, this is still a challenging task for artificial syntheses. Despite its significance, until now, there are still no reports on colloidal mineral nanoparticles in the subnanometer range. Here we developed a general gas diffusion strategy using 10,12-pentacosadiynoic acid as a ligand and ethanol as a solvent to fabricate stable amorphous mineral clusters with a core size of less than 2 nm. First discovered for CaCO3, the method was successfully extended to produce monolayer protected clusters of MgCO3, SrCO3, Eu2(CO3)3, Tb2(CO3)3, Ce2(CO3)3, Ca x (PO4) y , CaC2O4 and their hybrid minerals, Ca x Mg y (CO3) z and Ca x (CO3) y (PO4) z ...
February 1, 2017: Chemical Science
Zhiyong Jiang, Ran Chen, Ying Lu, Ben Whiteside, Phil Coates, Zhonghua Wu, Yongfeng Men
In situ small-, ultrasmall-, and wide-angle X-ray scattering measurements were performed to investigate the structural evolution of crystalline lamellae and cavities as a function of deformation ratio during tensile deformation of isothermally crystallized poly(ε-caprolactone). The cavities were modeled as cylinder-shaped objects which are oriented along the stretching direction and randomly distributed in the samples, and their dimensions were evaluated by direct model fitting of scattering patterns. At small deformations, the orientation of these cavities at the onset of cavity formation was related to the isothermal crystallization temperature...
June 28, 2017: Journal of Physical Chemistry. B
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