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Xin Tian, Zaixing Yang, Guangxin Duan, Anqing Wu, Zonglin Gu, Leili Zhang, Chunying Chen, Zhifang Chai, Cuicui Ge, Ruhong Zhou
Graphene and graphene-based nanomaterials are broadly used for various biomedical applications due to their unique physiochemical properties. However, how graphene-based nanomaterials interact with biological systems has not been thoroughly studied. This study shows that graphene oxide (GO) nanosheets retard A549 lung carcinoma cell migration through nanosheet-mediated disruption of intracellular actin filaments. After GO nanosheets treatment, A549 cells display slower migration and the structure of the intracellular actin filaments is dramatically changed...
October 20, 2016: Small
Fan Zhang, Yue Sun, Demei Tian, Weon Sup Shin, Jong Seung Kim, Haibing Li
Host-guest recognition plays an important role in biological analysis and biosensing. Accordingly, great efforts have been devoted to the development of sensors using versatile 3D surface materials. These functionalized nanomaterials possess the advantages of high selectivity and visual signals, enabling the selective detection of ions, amino acids, proteins, and other biological molecules. Therefore, in this feature article, we present some significant and representative examples of molecular recognition on calixarene functionalized 3D surface nanomaterials...
October 20, 2016: Chemical Communications: Chem Comm
Hye-Hyeon Byeon, Seung-Woo Lee, Eun-Hee Lee, Woong Kim, Hyunjung Yi
Delicately assembled composites of semiconducting nanomaterials and biological materials provide an attractive interface for emerging applications, such as chemical/biological sensors, wearable health monitoring devices, and therapeutic agent releasing devices. The nanostructure of composites as a channel and a sensing material plays a critical role in the performance of field effect transistors (FETs). Therefore, it is highly desirable to prepare elaborate composite that can allow the fabrication of high performance FETs and also provide high sensitivity and selectivity in detecting specific chemical/biological targets...
October 20, 2016: Scientific Reports
Eero Kontturi, Anne Meriluoto, Paavo A Penttilä, Niki Baccile, Jani-Markus Malho, Antje Potthast, Thomas Rosenau, Janne Ruokolainen, Ritva Serimaa, Janne Laine, Herbert Sixta
Despite the structural, load-bearing role of cellulose in the plant kingdom, countless efforts have been devoted to degrading this recalcitrant polysaccharide, particularly in the context of biofuels and renewable nanomaterials. Herein, we show how the exposure of plant-based fibers to HCl vapor results in rapid degradation with simultaneous crystallization. Because of the unchanged sample texture and the lack of mass transfer out of the substrate in the gas/solid system, the changes in the crystallinity could be reliably monitored...
October 20, 2016: Angewandte Chemie
Shokoufeh Hassani, Saeideh Momtaz, Faezeh Vakhshiteh, Armin Salek Maghsoudi, Mohammad Reza Ganjali, Parviz Norouzi, Mohammad Abdollahi
This review discusses the past and recent advancements of biosensors focusing on detection of organophosphorus pesticides (OPs) due to their exceptional use during the last decades. Apart from agricultural benefits, OPs also impose adverse toxicological effects on animal and human population. Conventional approaches such as chromatographic techniques used for pesticide detection are associated with several limitations. A biosensor technology is unique due to the detection sensitivity, selectivity, remarkable performance capabilities, simplicity and on-site operation, fabrication and incorporation with nanomaterials...
October 19, 2016: Archives of Toxicology
Luna Rahman, Dongmei Wu, Michael Johnston, Andrew William, Sabina Halappanavar
Titanium dioxide nanoparticles (TiO2NPs) induce lung inflammation in experimental animals. In this study, we conducted a comprehensive toxicogenomic analysis of lung responses in mice exposed to six individual TiO2NPs exhibiting different sizes (8, 20 and 300nm), crystalline structure (anatase, rutile or anatase/rutile) and surface modifications (hydrophobic or hydrophilic) to investigate whether the mechanisms leading to TiO2NP-induced lung inflammation are property specific. A detailed histopathological analysis was conducted to investigate the long-term disease implications of acute exposure to TiO2NPs...
October 19, 2016: Mutagenesis
Xin Yin, Xudong Wang
Nanocrsytal facet evolution is critical for designing nanomaterial morphology and controlling their properties. In this work, we report a unique high-energy crystal facets evolution phenomenon at the tips of Wurtzite zinc oxide nanowires (NWs). As the zinc vapor supersaturation decreased at the NW deposition region, the NW tip facets evolved from the (0001) surface, to the {10-13} surface, and subsequently to the {11-22} surface, and eventually back to the flat (0001) surface. A series of NW tip morphology was observed in accordance to the different combinations of exposed facets...
October 19, 2016: Nano Letters
Minh T Nguyen, Richard A Jones, Bradley J Holliday
CdSe nanocrystals with tunable sizes and distributions were synthesized directly from Cd(ii) ions coordinated to the conjugated backbone of a thiophene-based conducting metallopolymer. Using our seeded growth technique, the resulting nanocrystals are in direct electronic communication with the polymer, which leads to effective charge transfer between the donor and acceptor.
October 19, 2016: Chemical Communications: Chem Comm
Jing-Min Liu, Yao-Yao Liu, Dong-Dong Zhang, Guozhen Fang, Shuo Wang
The rise of multimodal nanoprobes has promoted the development of new methods to explore multiple molecular targets simultaneously, or to combine various bioimaging tools in one assay to more clearly delineate localization and expression of bio-markers. Persistent luminescence nanophosphors (PLNPs) have been qualified as the promising contrast agent for in vivo imaging. The easy surface modification and proper nanostructure design strategy would favor the fabrication of PLNPs based multi-functional nanoprobes for biological application...
October 19, 2016: ACS Applied Materials & Interfaces
Fengyang Xu, Jie Liu, Jian Tian, Lingfeng Gao, Xiaju Cheng, Yue Pan, Ziling Sun, Xinming Li
In this work, we reported the generation of a novel supramolecular hydrogelator from a peptide derivative which consisted of a structural motif (e.g., Fc-FF) for supramolecular self-assembly and a functional moiety (e.g., RGD) for integrin binding. Following self-assembly in water at neutral pH, this molecule firstly tended to form metastable spherical aggregates, which subsequently underwent a morphological transformation to form high-aspect-ratio nanostructures over 2 h when aged at room temperature. More importantly, because of the presence of nanoscale RGD clusters on the surface of nanostructures, the self-assembled nanomaterials (e...
October 19, 2016: ACS Applied Materials & Interfaces
Tan Xing, Srikanth Mateti, Lu Hua Li, Fengxian Ma, Aijun Du, Yury Gogotsi, Ying Chen
Two-dimensional (2D) materials can be produced using ball milling with the help of liquid surfactants or solid exfoliation agents, as ball milling of bulk precursor materials usually produces nanosized particles because of high-energy impacts. Post-milling treatment is thus needed to purify the nanosheets. We show here that nanosheets of graphene, BN, and MoS2 can be produced by ball milling of their bulk crystals in the presence of ammonia or a hydrocarbon ethylene gas and the obtained nanosheets remain flat and maintain their single-crystalline structure with low defects density even after a long period of time; post-milling treatment is not needed...
October 19, 2016: Scientific Reports
Chih-Ming Chen, Zheng-Kun Lin, Wei-Jie Huang, Sheng-Hsiung Yang
In this work, we demonstrate a novel carrier transporting combination made of tungsten trioxide (WO3) nanomaterials and Cs2CO3/PCBM buffer bilayer for the fabrication of perovskite solar cells (PSCs). Two different types of WO3, including nanoparticles and nanorods, were prepared by sol-gel process and hydrothermal method, respectively. Cs2CO3/PCBM buffer bilayer was inserted between WO3 and perovskite layers to improve charge transfer efficiency and formation of pinhole-free perovskite layer. Besides, the leakage current of the devices containing Cs2CO3/PCBM buffer bilayer was significantly suppressed...
December 2016: Nanoscale Research Letters
Ronaldo Custodio de Souza Oliveira, Rodrigo José Corrêa, Raquel Simas Pereira Teixeira, Daniela Dias Queiroz, Rodrigo da Silva Souza, Simon John Garden, Nanci Camara de Lucas, Marcos Dias Pereira, Josué Sebastián Bello Forero, Eric Cardona Romani, Emerson Schwingel Ribeiro
In the present study, SiO2 nanoparticles functionalized with 3-(2-aminoethylamino)propyl group (SiNP-AAP) were used, for the first time, to covalently bond rose bengal (SiNP-AAP-RB) or 9,10-anthraquinone-2-carboxylic acid (SiNP-AAP-OCAq). The functionalized SiNP were characterized by: Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM); elemental analysis (CHN) for determination of the dye concentration; FTIR and UV-vis diffuse reflectance (DR-UV-vis) and a surface area study (BET). The functionalized SiNPs were applied in photodynamic therapy (PDT) against lung cancer cell lines...
October 13, 2016: Journal of Photochemistry and Photobiology. B, Biology
Daniela Pelclova, Vladimir Zdimal, Petr Kacer, Martin Komarc, Zdenka Fenclova, Stepanka Vlckova, Nadezda Zikova, Jaroslav Schwarz, Otakar Makes, Tomas Navratil, Sergey Zakharov, Dhimiter Bello
Nanoscale titanium dioxide (nanoTiO2) is a commercially important nanomaterial used in numerous applications. Experimental studies with nanotitania have documented lung injury and inflammation, oxidative stress, and genotoxicity. Production workers in TiO2 manufacturing with a high proportion of nanoparticles and a mixture of other air pollutants, such as gases and organic aerosols, had increased markers of oxidative stress, including DNA and protein damage, as well as lipid peroxidation in their exhaled breath condensate (EBC) compared to unexposed controls...
October 18, 2016: Reviews on Environmental Health
Yao Tian, Kenneth S Burch
Raman spectroscopy is a powerful technique, widely used in both academia and industry. In part, the technique's extensive use stems from its ability to uniquely identify and image various material parameters: composition, strain, temperature, lattice/excitation symmetry, and magnetism in bulk, nano, solid, and organic materials. However, in nanomaterials and samples with low thermal conductivity, these measurements require long acquisition times. On the other hand, charge-coupled device (CCD) detectors used in Raman microscopes are vulnerable to cosmic rays...
October 17, 2016: Applied Spectroscopy
Thomas Sannicolo, Mélanie Lagrange, Anthony Cabos, Caroline Celle, Jean-Pierre Simonato, Daniel Bellet
Transparent electrodes attract intense attention in many technological fields, including optoelectronic devices, transparent film heaters and electromagnetic applications. New generation transparent electrodes are expected to have three main physical properties: high electrical conductivity, high transparency and mechanical flexibility. The most efficient and widely used transparent conducting material is currently indium tin oxide (ITO). However the scarcity of indium associated with ITO's lack of flexibility and the relatively high manufacturing costs have a prompted search into alternative materials...
October 18, 2016: Small
Jatish Kumar, K George Thomas, Luis M Liz-Marzán
The field of chirality has recently seen a rejuvenation due to the observation of chirality in inorganic nanomaterials. The advancements in understanding the origin of nanoscale chirality and the potential applications of chiroptical nanomaterials in the areas of optics, catalysis and biosensing, among others, have opened up new avenues toward new concepts and design of novel materials. In this article, we review the concept of nanoscale chirality in metal nanoclusters and semiconductor quantum dots, then focus on recent experimental and theoretical advances in chiral metal nanoparticles and plasmonic chirality...
October 18, 2016: Chemical Communications: Chem Comm
Kristian J Tangso, Paulo Henrique C D da Cunha, Patrick T Spicer, Jian Li, Ben J Boyd
Infections arising in hospitalized patients, particularly those who have undergone surgery and are reliant on receiving treatment through biomedical devices, continue to be a rising concern. It is well known that aqueous mixtures of oppositely charged surfactant and polymer molecules can self-assemble to form liquid crystalline structures primarily via electrostatically-driven interactions which have demonstrated great potential as tailored release nanomaterials. Colistin is a re-emerging antibiotic used against multidrug-resistant Gram negative bacteria...
October 17, 2016: ACS Applied Materials & Interfaces
Xuejing Cui, Bin Wan, Liang-Hong Guo, Yu Yang, Xiao-Min Ren
Co-existence of nanomaterials and environmental pollutants requires in-depth understanding of combined toxicity and underlying mechanism. In this work, we found that co-exposure to the mixture of non-cytotoxic level of single-walled carbon nanotubes (SWCNTs) (10 µg/mL) and Ni2+ (20 µM) induced significant cytotoxicity in macrophages. However, almost equal amount of intracellular Ni2+ was detected after Ni2+/SWCNT co-exposure or Ni2+ single exposure, indicating no enhanced cellular uptake of Ni2+ occurred...
October 17, 2016: Environmental Science & Technology
Snober Ahmed, John Brockgreitens, Ke Xu, Abdennour Abbas
With increasing biomedical and engineering applications of selenium nanospheres (SeNS), new efficient methods are needed for the synthesis and long-term preservation of these nanomaterials. Currently, SeNS are mostly produced through the biosynthesis route using microorganisms or by using wet chemical reduction, both of which have several limitations in terms of nanoparticle size, yield, production time and long-term stability of the nanoparticles. Here, we introduce a novel approach for rapid synthesis and long-term preservation of SeNS on a solid microporous support by combining a mild hydrothermal process with chemical reduction...
October 17, 2016: Nanotechnology
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