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https://www.readbyqxmd.com/read/28441729/the-influence-of-hydroxyapatite-nanoparticle-morphology-on-embryonic-development-in-a-zebrafish-exposure-model
#1
Shiuli Pujari-Palmer, Xi Lu, Marjam Karlsson Ott
Nanomaterials are used in many different industries such as cosmetics, food, clothing, and electronics. There is increasing concern that exposure to nanoparticles (NPs) during pregnancy can adversely affect fetal development. It is well known that the size, charge, and chemistry of a nanoparticle can modulate embryological development. The role that particle morphology plays on early development, however, is still widely unknown. The present study aims to investigate the effect of hydroxyapatite nanoparticle (HANP) morphology on embryological development in a zebrafish exposure model...
April 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28441003/chemical-interaction-guided-metal-free-growth-of-large-area-hexagonal-boron-nitride-on-silicon-based-substrates
#2
Sanjay Behura, Phong Nguyen, Rousan Debbarma, Songwei Che, Michael R Seacrist, Vikas Berry
Hexagonal boron nitride (h-BN) is an ideal platform for interfacing with two-dimensional (2D) nanomaterials to reduce carrier scattering for high-quality 2D electronics. However, scalable, transfer-free growth of hexagonal boron nitride (h-BN) remains a challenge. Currently, h-BN based 2D heterostructures require exfoliation or chemical transfer of h-BN grown on metals resulting in small areas or significant interfacial impurities. Here, we demonstrate a surface-chemistry influenced transfer-free growth of large-area, uniform, and smooth h-BN directly on silicon (Si)-based substrates including Si, silicon nitride (Si3N4), and silicon dioxide (SiO2) via low-pressure chemical vapor deposition...
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28422235/a-facile-mechanochemical-route-to-a-covalently-bonded-graphitic-carbon-nitride-g-c3n4-and-fullerene-hybrid-toward-enhanced-visible-light-photocatalytic-hydrogen-production
#3
Xiang Chen, Huanlin Chen, Jian Guan, Jieming Zhen, Zijun Sun, Pingwu Du, Yalin Lu, Shangfeng Yang
Graphitic carbon nitride (g-C3N4) as an emerging two-dimensional (2D) nanomaterial has been commonly used as a metal-free photocatalyst with potential applications in visible light photocatalytic water-splitting. However, the photocatalytic activity of g-C3N4 is quite low due to its relatively large band gap and the existence of contact resistance between the nanosheets. Herein we report for the first time the facile synthesis of a covalently bonded g-C3N4/C60 hybrid via a solid-state mechanochemical route and its application in photocatalytic hydrogen production under visible light...
April 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28398031/a-carbon-nanotube-optical-sensor-reports-nuclear-entry-via-a-noncanonical-pathway
#4
Januka Budhathoki-Uprety, Rachel E Langenbacher, Prakrit V Jena, Daniel Roxbury, Daniel A Heller
Single-walled carbon nanotubes are of interest in biomedicine for imaging and molecular sensing applications and as shuttles for various cargos such as chemotherapeutic drugs, peptides, proteins, and oligonucleotides. Carbon nanotube surface chemistry can be modulated for subcellular targeting while preserving photoluminescence for label-free visualization in complex biological environments, making them attractive materials for such studies. The cell nucleus is a potential target for many pathologies including cancer and infectious diseases...
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28378524/building-block-dependent-morphology-modulation-of-cage-nanoparticles-and-recognition-of-nitroaromatics
#5
Partha Sarathi Mukherjee, Koushik Acharyya, Aniket Chowdhury, Bijnaneswar Mondal, Shubhadip Chakraborty
Morphology of nanomaterials has high impact on their chemical/physical properties, while controlled synthesis of such materials with desirable morphology is a grand challenge. This article presents the role of a building block on the morphology of organic cage particles. In this context, three organic cages (A3X2, B3X2 and C3X2) have been devised from triphenylamine based dialdehydes and a flexible triamine (X) utilizing dynamic imine chemistry. All the synthesized cages have been characterized by various spectroscopic techniques, which suggested the formation of [3+2] assembled architectures...
April 5, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28370070/capillary-electrophoresis-of-covalently-functionalized-single-chirality-carbon-nanotubes
#6
Pingli He, Brendan Meany, Chunyan Wang, Yanmei Piao, Hyejin Kwon, Shunliu Deng, YuHuang Wang
We demonstrate the separation of chirality-enriched single-walled carbon nanotubes (SWCNTs) by degree of surface functionalization using high-performance CE. Controlled amounts of negatively charged and positively charged functional groups were attached to the sidewall of chirality-enriched SWCNTs through covalent functionalization using 4-carboxybenzenediazonium tetrafluoroborate or 4-diazo-N,N-diethylaniline tetrafluoroborate, respectively. Surfactant- and pH-dependent studies confirmed that under conditions that minimized ionic screening effects, separation of these functionalized SWCNTs was strongly dependent on the surface charge density introduced through covalent surface chemistry...
March 30, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28368852/biomedical-applications-of-nanodiamond-review
#7
Kostiantyn Turcheniuk, Vadym Mochalin
The interest to applications of nanodiamond in biology and medicine is on the rise over the recent years. This is due to the unique combination of properties that nanodiamond provides. Small size (~ 5 nm), low cost, scalable production, negligible toxicity, chemical inertness of diamond core and rich chemistry of nanodiamond surface, as well as bright and robust fluorescence resistant to photobleaching are the distinct parameters that render nanodiamond superior to any other nanomaterial when it comes to biomedical applications...
April 3, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28356613/atomic-layer-deposition-of-titanium-oxide-on-single-layer-graphene-an-atomic-scale-study-toward-understanding-nucleation-and-growth
#8
Yucheng Zhang, Carlos Guerra-Nuñez, Ivo Utke, Johann Michler, Piyush Agrawal, Marta D Rossell, Rolf Erni
Controlled synthesis of a hybrid nanomaterial based on titanium oxide and single-layer graphene (SLG) using atomic layer deposition (ALD) is reported here. The morphology and crystallinity of the oxide layer on SLG can be tuned mainly with the deposition temperature, achieving either a uniform amorphous layer at 60 °C or ∼2 nm individual nanocrystals on the SLG at 200 °C after only 20 ALD cycles. A continuous and uniform amorphous layer formed on the SLG after 180 cycles at 60 °C can be converted to a polycrystalline layer containing domains of anatase TiO2 after a postdeposition annealing at 400 °C under vacuum...
March 14, 2017: Chemistry of Materials: a Publication of the American Chemical Society
https://www.readbyqxmd.com/read/28345352/metal-free-photoinduced-electron-transfer-atom-transfer-radical-polymerization-integrated-with-bioinspired-polydopamine-chemistry-as-a-green-strategy-for-surface-engineering-of-magnetic-nanoparticles
#9
Yang Yang, Xuegang Liu, Gang Ye, Shan Zhu, Zhe Wang, Xiaomei Huo, Krzysztof Matyjaszewski, Yuexiang Lu, Jing Chen
Developing green and efficient technologies for surface modification of magnetic nanoparticles (MNPs) is of crucial importance for their biomedical and environmental applications. This study reports, for the first time, a novel strategy by integrating metal-free photoinduced electron transfer-atom transfer radical polymerization (PET-ATRP) with the bioinspired polydopamine (PDA) chemistry for controlled architecture of functional polymer brushes from MNPs. Conformal PDA encapsulation layers were initially generated on the surfaces of MNPs, which served as the protective shells while providing an ideal platform for tethering 2-bromo-2-phenylacetic acid (BPA), a highly efficient initiator...
April 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28333448/role-of-oxygen-functionalities-in-graphene-oxide-architectural-laminate-subnanometer-spacing-and-water-transport
#10
Carlo Alberto Amadei, Andrea Montessori, Julian P Kadow, Sauro Succi, Chad D Vecitis
Active research in nanotechnology contemplates the use of nanomaterials for environmental engineering applications. However, a primary challenge is understanding the effects of nanomaterial properties on industrial device performance and translating unique nanoscale properties to the macroscale. One emerging example consists of graphene oxide (GO) membranes for separation processes. Thus, here we investigate how individual GO properties can impact GO membrane characteristics and water permeability. GO chemistry and morphology were controlled with easy-to-implement photoreduction and sonication techniques and were quantitatively correlated, offering a valuable tool for accelerating characterization...
April 6, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28322139/heparin-tailored-biopolymeric-nanocarriers-in-site-specific-delivery-a-systematic-review
#11
REVIEW
Ashish Garg, Rajeev Sharma, Vikas Pandey, Vaibhav Patel, Awesh K Yadav
The combination of nanocarriers and biological molecules is of intense interest because of the synergistic properties offered by such newly synthesized composites. Heparin conjugated to nanomaterials has recently been investigated for its beneficial chemical and biological properties and its capacity to improve the biocompatibility of nanocarriers, increasing their performance in various biological applications. A variety of recent research combines heparin and nanomaterials for a myriad of uses. For example, heparin has been conjugated to the surface of magnetic and metallic nanoparticles, biodegradable and nondegradable synthetic polymers, nanocomposites, dendrimers, and the like...
2017: Critical Reviews in Therapeutic Drug Carrier Systems
https://www.readbyqxmd.com/read/28306244/recent-advances-in-ultrathin-two-dimensional-nanomaterials
#12
Chaoliang Tan, Xiehong Cao, Xue-Jun Wu, Qiyuan He, Jian Yang, Xiao Zhang, Junze Chen, Wei Zhao, Shikui Han, Gwang-Hyeon Nam, Melinda Sindoro, Hua Zhang
Since the discovery of mechanically exfoliated graphene in 2004, research on ultrathin two-dimensional (2D) nanomaterials has grown exponentially in the fields of condensed matter physics, material science, chemistry, and nanotechnology. Highlighting their compelling physical, chemical, electronic, and optical properties, as well as their various potential applications, in this Review, we summarize the state-of-art progress on the ultrathin 2D nanomaterials with a particular emphasis on their recent advances...
March 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28295556/core-chemistry-influences-the-toxicity-of-multi-component-metal-oxide-nanomaterials-lithium-nickel-manganese-cobalt-oxide-and-lithium-cobalt-oxide-to-daphnia-magna
#13
Jared Bozich, Mimi Hang, Robert Hamers, Rebecca Klaper
Lithium intercalation compounds such as lithium nickel manganese cobalt oxide (NMC) and lithium cobalt oxide (LCO) are used extensively in lithium batteries. Because there is currently little economic incentive for recycling, chances are greater that batteries will end up in landfills or waste in the environment. In addition, the toxicity of these battery materials has not been traditionally part of the design process. Therefore, to determine the environmental impact and the possibility of alternative battery materials, representative complex battery nanomaterials, LCO and NMC, were synthesized and toxicity was assessed in Daphnia magna...
March 11, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28288893/redox-responsive-theranostic-nanoplatforms-based-on-inorganic-nanomaterials
#14
Lu Han, Xiao-Yong Zhang, Yu-Long Wang, Xi Li, Xiao-Hong Yang, Min Huang, Kun Hu, Lu-Hai Li, Yen Wei
Spurred on by advances in materials chemistry and nanotechnology, scientists have developed many novel nanopreparations for cancer diagnosis and therapy. To treat complex malignant tumors effectively, multifunctional nanomedicines with targeting ability, imaging properties and controlled drug release behavior should be designed and exploited. The therapeutic efficiency of loaded drugs can be dramatically improved using redox-responsive nanoplatforms which can sense the differences in the redox status of tumor tissues and healthy ones...
March 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28287138/biofunctionalized-3-d-carbon-nano-network-platform-for-enhanced-fibroblast-cell-adhesion
#15
A K M Rezaul Haque Chowdhury, Amirhossein Tavangar, Bo Tan, Krishnan Venkatakrishnan
Carbon nanomaterials have been investigated for various biomedical applications. In most cases, however, these nanomaterials must be functionalized biologically or chemically due to their biological inertness or possible cytotoxicity. Here, we report the development of a new carbon nanomaterial with a bioactive phase that significantly promotes cell adhesion. We synthesize the bioactive phase by introducing self-assembled nanotopography and altered nano-chemistry to graphite substrates using ultrafast laser...
March 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28281264/resonance-energy-transfer-based-nucleic-acid-hybridization-assays-on-paper-based-platforms-using-emissive-nanoparticles-as-donors
#16
Samer Doughan, M Omair Noor, Yi Han, Ulrich J Krull
Quantum dots (QDs) and upconverting nanoparticles (UCNPs) are luminescent nanoparticles (NPs) commonly used in bioassays and biosensors as resonance energy transfer (RET) donors. The narrow and tunable emissions of both QDs and UCNPs make them versatile RET donors that can be paired with a wide range of acceptors. Ratiometric signal processing that compares donor and acceptor emission in RET-based transduction offers improved precision, as it accounts for fluctuations in the absolute photoluminescence (PL) intensities of the donor and acceptor that can result from experimental and instrumental variations...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28274115/progress-in-nanotheranostics-based-on-mesoporous-silica-nanomaterial-platforms
#17
Rajendra K Singh, Kapil D Patel, Kam W Leong, Hae-Won Kim
Theranostics based on nanoparticles (NPs) is a promising paradigm in nanomedicine. Mesoporous silica nanoparticle (MSN)-based systems offer unique characteristics to enable multimodal imaging or simultaneous diagnosis and therapy. They include large surface area and volume, tunable pore size, functionalizable surface, and acceptable biological safety. Hybridization with other NPs and chemical modification can further potentiate the multifunctionality of MSN-based systems toward translation. Here, we update the recent progress on MSN-based systems for theranostic purposes...
March 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28272443/effective-construction-of-high-quality-iron-oxy-hydroxides-and-co-doped-iron-oxy-hydroxides-nanostructures-towards-the-promising-oxygen-evolution-reaction-application
#18
Xinyu Zhang, Li An, Jie Yin, Pinxian Xi, Zhiping Zheng, Yaping Du
Rational design of high efficient and low cost electrocatalysts for oxygen evolution reaction (OER) plays an important role in water splitting. Herein, a general gelatin-assisted wet chemistry method is employed to fabricate well-defined iron oxy-hydroxides and transitional metal doped iron oxy-hydroxides nanomaterials, which show good catalytic performances for OER. Specifically, the Co-doped iron oxy-hydroxides (Co0.54Fe0.46OOH) show the excellent electrocatalytic performance for OER with an onset potential of 1...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28252939/rapid-formation-of-metal-organic-frameworks-mofs-based-nanocomposites-in-microdroplets-and-their-applications-for-co2-photoreduction
#19
Xiang He, Zhuoran Gan, Sergey Fisenko, Dawei Wang, Hani M El-Kaderi, Wei-Ning Wang
A copper-based metal-organic framework (MOF), [Cu3(TMA)2(H2O)3]n (also known as HKUST-1, where TMA stands for trimesic acid), and its TiO2 nanocomposites were directly synthesized in micrometer-sized droplets via a rapid aerosol route for the first time. The effects of synthesis temperature and precursor component ratio on the physicochemical properties of the materials were systematically investigated. Theoretical calculations on the mass and heat transfer within the microdroplets revealed that the fast solvent evaporation and high heat transfer rates are the major driving forces...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28252133/binary-halide-ternary-perovskite-like-and-perovskite-derivative-nanostructures-hot-injection-synthesis-and-optical-and-photocatalytic-properties
#20
Suh-Ciuan Lim, Hsuan-Peng Lin, Wei-Lun Tsai, Hao-Wu Lin, Yao-Tsung Hsu, Hsing-Yu Tuan
A variety of crystalline colloid binary halide, ternary perovskite-like and ternary perovskite-derivative nanostructures with well-defined morphologies were synthesized, thus expanding materials chemistry to the new category of nanomaterials. The optical and photocatalytic properties of ternary nanostructures were investigated.
March 2, 2017: Nanoscale
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