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Meng-Hsuan Chao, Yen-Ting Lin, Namasivayam Dhenadhayalan, Hsin-Lung Lee, Hsin-Yen Lee, King-Chuen Lin
Single-molecule fluorescence correlation spectroscopy overcomes the resolution barrier of optical microscopy (10≈-20 nm) and is utilized to look into lipid dynamics in small unilamellar vesicles (SUVs; diameter < 100 nm). The fluorescence trajectories of lipid-like tracer 1,1'-dioctadecyl-3,3,3',3'-tetramethylindodicarbocyanine (DiD) in the membrane bilayers are acquired at a single-molecule level. The autocorrelation analysis yields the kinetic information on lipid organization, oxygen transport, and lateral diffusion in SUVs' membrane...
January 16, 2017: Small
Jonathon L Baker, Batbileg Bor, Melissa Agnello, Wenyuan Shi, Xuesong He
Although great strides have been made in understanding the complex bacterial community inhabiting the human oral cavity, for a variety of (mainly technical) reasons the ecological contributions of oral fungi, viruses, phages, and the candidate phyla radiation (CPR) group of ultrasmall bacteria have remained understudied. Several recent reports have illustrated the diversity and importance of these organisms in the oral cavity, while TM7x and Candida albicans have served as crucial paradigms for CPR species and oral fungi, respectively...
January 11, 2017: Trends in Microbiology
Lin Chen, Lilin Lu, Hengli Zhu, Yueguang Chen, Yu Huang, Yadong Li, Leyu Wang
Incorporating oxophilic metals into noble metal-based catalysts represents an emerging strategy to improve the catalytic performance of electrocatalysts in fuel cells. However, effects of the distance between the noble metal and oxophilic metal active sites on the catalytic performance have rarely been investigated. Herein, we report on ultrasmall (∼5 nm) Pd-Ni-P ternary nanoparticles for ethanol electrooxidation. The activity is improved up to 4.95 A per mgPd, which is 6.88 times higher than commercial Pd/C (0...
January 10, 2017: Nature Communications
Vinay Raichur, Kusum Devi Vemula, Naini Bhadri, Rema Razdan
Drug delivery to deep-seated tissues such as bone has been a major complication till date. This preferential drug delivery is further important in targeting anti-tumour agents to bone metastasis owing to its complexity. The present study involves the formulation of PLGA nanoparticles and conjugation with zolendronic acid-a bisphosphonate which will anchor the nanosystem to bone due to its selective bone affinity. The conjugated nanosystem was characterized for particle size by TEM (average 36 nm) and morphology by AFM depicting surface irregularities due to ZOL conjugation on the surface of nanoparticles...
January 9, 2017: AAPS PharmSciTech
Zongnan Deng, Hao Jiang, Yanjie Hu, Yu Liu, Ling Zhang, Honglai Liu, Chunzhong Li
A flexible and robust electrode is demonstrated by assembling the 3D ordered macroporous MoS2 @C nanostructure on carbon cloth with ultrasmall few-layered MoS2 nanosheets homogenously embedded into the interconnected carbon wall. Such unique nanostructures are favorable for enhancing lithium storage capacity, directly applied as flexible electrode, demonstrating a very high electrochemical performance and superior cycling stability for lithium ion batteries.
January 9, 2017: Advanced Materials
Qiong Xue, Jin-Kuo Li, Zhi-Yong Yang
An interconnected framework of reduced graphene oxide/phenyl formaldehyde polymer composites was synthesized by a one-pot hydrothermal reaction followed by carbonizing under different conditions. Then, the obtained porous materials with varied surface properties were used to disperse ultrasmall Pt nanoparticles. The catalyst with the optimized support demonstrates superior achievements to methanol oxidation reaction (MOR): distinctive improved mass activity (MA) and specific activity at both forward peak position and at the potential range near the operation of fuel cells, best antipoisonous ability revealed by 17 times MA and 7 times the retaining rate of commercial Pt/C in chronoamperometric evaluations, and outstanding long-term stability verified by 3-4 times MA and the retaining rate of Pt/C in the accelerated duration tests...
January 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Tim Schmitz, Ulf Wiedwald, Carsten Dubs, Bilal Gökce
Pulsed laser ablation of pressed yttrium-ion-garnet powders in water is studied and compared to the ablation of a single crystal target. We find that target porosity is a crucial factor which has far-reaching implications on nanoparticle productivity. Although nanoparticle size distributions obtained by analytical disc centrifugation and transmission electron microscopy (TEM) are in agreement, X-ray diffraction and energy dispersive X-ray analysis show that only nanoparticles obtained from targets with densities close to that of a bulk target lead to comparable properties...
December 29, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Nan Li, Aung Than, Chencheng Sun, Jingqi Tian, Jie Chen, Kanyi Pu, Xiaochen Dong, Peng Chen
Monitoring cellular redox homeostasis is critical to the understanding of many physiological functions ranging from immune reactions to metabolism, as well as to the understanding of pathological development ranging from tumorigenesis to aging. Nevertheless, there is currently a lack of appropriate probes for this ambition, which should be reversibly, sensitively, and promptly responsive to a wide range of physiological oxidants and reductants. In this work, a redox-sensitive fluorescence-switchable probe is designed based on graphene quantum dots (GQDs) functionalized with a chelated redox Fe(2+)/Fe(3+) couple...
December 27, 2016: ACS Nano
Fangxin Mao, Ling Wen, Caixia Sun, Shaohua Zhang, Guanglin Wang, Jianfeng Zeng, Yong Wang, Jianmin Ma, Mingyuan Gao, Zhen Li
Sub-3 nm ultrasmall Bi2Se3 nanodots stabilized with bovine serum albumin were successfully synthesized through a reaction of hydroxyethylthioselenide with bismuth chloride in aqueous solution under ambient conditions. These nanodots exhibit a high photothermal conversion efficiency (η = 50.7%) due to their strong broad absorbance in the near-infrared (NIR) window and serve as a nanotheranostic agent for photoacoustic imaging and photothermal cancer therapy. In addition, they also display radioenhancement with a ratio of 6% due to their sensitivity to X-rays, which makes them a potential sensitizer for radiotherapy...
December 27, 2016: ACS Nano
Jwa-Min Nam, Jeong-Wook Oh, Haemi Lee, Yung Doug Suh
Plasmonic coupling-based electromagnetic field localization and enhancement are becoming increasingly important in chemistry, nanoscience, materials science, physics, and engineering over the past decade, generating a number of new concepts and applications. Among the plasmonically coupled nanostructures, metal nanostructures with nanogaps have been of special interest due to their ultrastrong electromagnetic fields and controllable optical properties that can be useful for a variety of signal enhancements such as surface-enhanced Raman scattering (SERS)...
December 20, 2016: Accounts of Chemical Research
Yang Zhu, Takahiro Nakanishi, Kazuyoshi Kanamori, Kazuki Nakanishi, Shun Ichii, Kohji Iwaida, Yu Masui, Toshiyuki Kamei, Toyoshi Shimada, Akihito Kumamoto, Yumi H Ikuhara, Mina Jeon, George Hasegawa, Masamoto Tafu, Chang Won Yoon, Tewodros Asefa
Multifunctional catalysts are of great interest in catalysis because their multiple types of catalytic or functional groups can cooperatively promote catalytic transformations better than their constituents do individually. Herein we report a new synthetic route involving the surface functionalization of nanoporous silica with a rationally designed and synthesized dihydrosilane (3-aminopropylmethylsilane) that leads to the introduction of catalytically active grafted organoamine as well as single metal atoms and ultrasmall Pd or Ag-doped Pd nanoparticles via on-site reduction of metal ions...
December 23, 2016: ACS Applied Materials & Interfaces
Noelia Guldris, Bárbara Argibay, Juan Gallo, Ramón Iglesias-Rey, Enrique Carbó-Argibay, Yury V Kolen'ko, Francisco Campos, Tomás Sobrino, Laura M Salonen, Manuel Bañobre-López, José Castillo, José Rivas
Superparamagnetic iron oxide nanoparticles (SPIO-PAA), ultrasmall iron oxide nanoparticles (USPIO-PAA), and glucosamine-modified iron oxide nanoparticles (USPIO-PAA-GlcN) were studied as mesenchymal stem cell (MSCs) labels for cell tracking applications by magnetic resonance imaging (MRI). Pronounced differences were found in the labeling performance of the three samples in terms of cellular dose and labeling efficiency. In combination with polylysine, SPIO-PAA showed nonhomogeneous cell internalization, while for USPIO-PAA no uptake was found...
December 15, 2016: Bioconjugate Chemistry
Zhe Chen, Jinfeng Lu, Yuejie Ai, Yongfei Ji, Tadafumi Adschiri, Lijun Wan
Efficient water splitting through electrocatalysis has been studied extensively in modern energy devices, while the development of catalysts with activity and stability comparable to those of Pt is still a great challenge. In this work, we successfully developed a facile route to synthesize graphene-like layered carbon (GLC) from a layered silicate template. The obtained GLC has layered structure similar to that of the template and can be used as support to load ultrasmall Ru nanoparticles on it in supercritical water...
December 28, 2016: ACS Applied Materials & Interfaces
Zhijie Wang, Xiaoliang Yu, Wenhui He, Yusuf Valentino Kaneti, Da Han, Qi Sun, Yan-Bing He, Bin Xiang
Two-dimensional nanocarbons are intriguing functional materials for energy storage. However, the serious aggregation problems hinder their wider applications. To address this issue, we developed a unique two-dimensional hierarchical carbon architecture (2D-HCA) with ultrasmall graphene-like carbon nanosheets uniformly grown on hexagonal carbon nanoplates. The obtained 2D-HCA shows an interconnected porous structure and abundant heteroelement doping. When employed as anode for lithium ion batteries, it exhibits a high discharge capacity of 748 m Ah g(-1) even after 400 cycles at 2 A g(-1)...
December 14, 2016: ACS Applied Materials & Interfaces
Zhao-Hua Miao, Pan-Pan Wang, Yu-Chen Xiao, Hai-Tao Fang, Liang Zhen, Cheng-Yan Xu
Molybdenum disulfide with a layered structure and high theoretical capacity is attracting extensive attention for high-performance lithium-ion batteries. In this study, a simple and scalable method by freeze-drying of (NH4)2MoS4 and dopamine mixed solutions along with subsequent calcination is developed to realize the self-assembly of hierarchical MoS2/carbon composite nanosheets via the effect of dopamine-induced morphology transformation, in which ultrasmall few-layer MoS2 nanosheets were homogeneously embedded into a N-doped carbon framework (denoted as MoS2@N-CF)...
December 14, 2016: ACS Applied Materials & Interfaces
Yu-Rong An, Xiao-Li Fan, Zhi-Fen Luo, Woon-Ming Lau
With first-principles calculations, we find a new strategy for developing high-performance catalysts for hydrogen evolution reaction (HER) via controlling the morphology and size of nanopolygons of monolayer transition-metal dichalcogenides (npm-MS2, with M = Mo, W, or V). Particularly, through devising a quantitative method to measure HER-active sites per unit mass and using such HER site density to comparatively gauge npm-MS2 performance, we identify three keys in making npm-MS2 with optimal HER performance: (a) npm-MS2 should be triangular with each edge being M-terminated and each edge-M atom passivated by one S atom; (b) each edge of npm-MoS2 and WS2 should have 5-6 metal atoms as HER site density drops below/above these sizes optimal both for HER and practical npm growth; and (c) npm-VS2 is immune to this overly fastidious size dependence...
December 12, 2016: Nano Letters
Yakun Tang, Lang Liu, Hongyang Zhao, Shasha Gao, Yan Lv, Lingbing Kong, Junhong Ma, Dianzeng Jia
Compared with Li4Ti5O12, LiCrTiO4 with the same spinel structure exhibits superior conductivity and Li(+) diffusion properties. However, there has been no extensive study on LiCrTiO4 as an anode material in lithium ion batteries, due to its pulverization, loss of electrical contact, and particle aggregation. A unique architecture based on hybrid porous CNTs embedding ultrasmall LiCrTiO4 nanoparticles (6 ± 2 nm) was designed by using a facile sol-gel process combined with subsequent heat treatment. As an anode for lithium ion batteries, due to the absence of the aforementioned problems, the electrode exhibited high reversible capacity, excellent rate capability and superior long-term cycling stability at high current densities...
December 9, 2016: Chemical Communications: Chem Comm
Jian-Cheng Jin, Xiao-Juan Wu, Juan Xu, Bei-Bei Wang, Feng-Lei Jiang, Yi Liu
Silver materials have been widely used as antimicrobial agents. Notably, silver nanoparticles have emerged as a new generation of nanoproducts for biomedical and environmental applications in recent years. However, ultrasmall silver nanoclusters (NCs) (∼2 nm) have rarely been used to kill bacteria and their antibacterial mechanisms have not yet been fully elucidated. Herein, we studied the antibacterial activities of bifunctional fluorescent DHLA-AgNCs against three types of bacteria. The results showed that DHLA-AgNCs exhibited excellent antibacterial activities against Gram-negative E...
December 6, 2016: Biomaterials Science
Elvira Fantechi, Paula M Castillo, Erika Conca, Francesca Cugia, Claudio Sangregorio, Maria Francesca Casula
Gold-iron oxide composites were obtained by in situ reduction of an Au(III) precursor by an organic reductant (either potassium citrate or tiopronin) in a dispersion of preformed iron oxide ultrasmall magnetic (USM) nanoparticles. X-ray diffraction, transmission electron microscopy, chemical analysis and mid-infrared spectroscopy show the successful deposition of gold domains on the preformed magnetic nanoparticles, and the occurrence of either citrate or tiopronin as surface coating. The potential of the USM@Au nanoheterostructures as heat mediators for therapy through magnetic fluid hyperthermia was determined by calorimetric measurements under sample irradiation by an alternating magnetic field with intensity and frequency within the safe values for biomedical use...
December 6, 2016: Interface Focus
Bhavesh D Kevadiya, Aditya N Bade, Christopher Woldstad, Benson J Edagwa, JoEllyn M McMillan, Balasrinivasa R Sajja, Michael D Boska, Howard E Gendelman
: The size, shape and chemical composition of europium (Eu(3+)) cobalt ferrite (CFEu) nanoparticles were optimized for use as a "multimodal imaging nanoprobe" for combined fluorescence and magnetic resonance bioimaging. Doping Eu(3+) ions into a CF structure imparts unique bioimaging and magnetic properties to the nanostructure that can be used for real-time screening of targeted nanoformulations for tissue biodistribution assessment. The CFEu nanoparticles (size ∼7.2nm) were prepared by solvothermal techniques and encapsulated into poloxamer 407-coated mesoporous silica (Si-P407) to form superparamagnetic monodisperse Si-CFEu nanoparticles with a size of ∼140nm...
December 1, 2016: Acta Biomaterialia
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