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https://www.readbyqxmd.com/read/28728027/highly-sensitive-response-of-solution-processed-bismuth-sulfide-nanobelts-for-room-temperature-nitrogen-dioxide-detection
#1
Hao Kan, Min Li, Zhilong Song, Sisi Liu, Baohui Zhang, Jingyao Liu, Ming-Yu Li, Guangzu Zhang, ShengLin Jiang, Huan Liu
Low dimensional nanomaterials have emerged as candidates for gas sensors owing to their unique size-dependent properties. In this paper, Bi2S3 nanobelts were synthesized via a facile solvothermal process and spin-coated onto alumina substrates at room temperature. The conductometric devices can even sensitively response to the relatively low concentrations of NO2 at room temperature, and their sensing performance can be effectively enhanced by the ligand exchange treatment with inorganic salts. The Pb(NO3)2-treated device exhibited superior sensing performance of 58...
July 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28726576/recent-developments-in-thiolated-polymeric-hydrogels-for-tissue-engineering-applications
#2
Mani Gajendiran, Jae-Sung Rhee, Kyobum Kim
This review focuses on the recent strategy in the preparation of thiolated polymers and fabrication of their hydrogel matrices. The mechanism involved in the synthesis of thiolated polymers and fabrication of thiolated polymer hydrogels is exemplified with suitable schematic representations reported in the recent literature. The 2-iminothiolane namely "Traut's reagent" has been widely employed for effectively thiolating the natural polymers such as collagen and gelatin which contain free amino group in their back bone...
July 20, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/28726382/interparticle-reactions-an-emerging-direction-in-nanomaterials-chemistry
#3
K R Krishnadas, Ananya Baksi, Atanu Ghosh, Ganapati Natarajan, Anirban Som, Thalappil Pradeep
Nanoparticles exhibit a rich variety in terms of structure, composition, and properties. However, reactions between them remain largely unexplored. In this Account, we discuss an emerging aspect of nanomaterials chemistry, namely, interparticle reactions in solution phase, similar to reactions between molecules, involving atomically precise noble metal clusters. A brief historical account of the developments, starting from the bare, gas phase clusters, which led to the synthesis of atomically precise monolayer protected clusters in solution, is presented first...
July 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28725218/all-new-faces-of-diatoms-potential-source-of-nanomaterials-and-beyond
#4
REVIEW
Meerambika Mishra, Ananta P Arukha, Tufail Bashir, Dhananjay Yadav, G B K S Prasad
Nature's silicon marvel, the diatoms have lately astounded the scientific community with its intricate designs and lasting durability. Diatoms are a major group of phytoplanktons involved in the biogeochemical cycling of silica and are virtually inherent in every environment ranging from water to ice to soil. The usage of diatoms has proved prudently cost effective and its handling neither requires costly materials nor sophisticated instruments. Diatoms can easily be acquired from the environment, their culture requires ambient condition and does not involve any costly media or expensive instruments, besides, they can be transported in small quantities and proliferated to a desirable confluence from that scratch, thus are excellent cost effective industrial raw material...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28725018/morphology-transition-engineering-of-zno-nanorods-to-nanoplatelets-grafted-mo8o23-moo2-by-polyoxometalates-mechanism-and-possible-applicability-to-other-oxides
#5
Ahmed H Abdelmohsen, Waleed M A El Rouby, Nahla Ismail, Ahmed A Farghali
A new fundamental mechanism for reliable engineering of zinc oxide (ZnO) nanorods to nanoplatelets grafted Mo8O23-MoO2 mixed oxide with controlled morphology, composition and precise understanding of the nanoscale reaction mechanism was developed. These hybrid nanomaterials are gaining interest due to their potential use for energy, catalysis, biomedical and other applications. As an introductory section, we demonstrate a new expansion for the concept 'materials engineering' by discussing the fabrication of metal oxides nanostructures by bottom-up approach and carbon nanoparticles by top-down approach...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723203/multicolor-functional-carbon-dots-via-one-step-refluxing-synthesis
#6
Ting-Yi Wang, Chong-You Chen, Chang-Ming Wang, Ying Zi Tan, Wei-Ssu Liao
Carbon dots are admirable fluorescent nanomaterials due to their low cost, high photostability, excellent biocompatibility, and environmental friendliness. Most conventional carbon dot fabrication approaches produce single-colored fluorescent material in the preparation process; different methods are therefore required to synthesize distinct carbon dots for specific optical applications. In this study, carbon dots carrying different emission colors are prepared through a one-step refluxing process. The emission of these materials can be well-tuned by sodium hydroxide content in the precursor solution...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723113/an-inexpensive-single-use-carbon-based-sensor-for-the-rapid-and-early-detection-of-hydrocarbon-leaks
#7
H Bri Sebastian, Robert M Mayall, Roberto J Pilonieta, Steven L Bryant
A novel fabrication process for a single use, low-cost organic solvent sensor has been developed. The process is simple, and the materials are readily available. Carbon nanomaterials are self-assembled at a water/hexane interface, where the hexane phase contains dissolved paraffin wax. Upon the controlled evaporation of hexane, the paraffin wax precipitates, trapping the carbon nanoparticles at the surface in a paraffin wax backbone, realizing a carbon-nanoparticle-decorated film. The film is hydrophobic and highly electrically conductive...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723076/investigation-on-the-transformation-of-absorbed-oxygen-at-zno-101%C3%AC-0-surface-based-on-a-novel-thermal-pulse-method-and-density-functional-theory-simulation
#8
Tingqiang Yang, Yueli Liu, Wei Jin, Yiyang Han, Shuang Yang, Wen Chen
Absorbed oxygen plays a key role in gas sensing process of ZnO nanomaterials. In this work, the transformation of absorbed oxygen on ZnO (101̅0) and its effects on gas sensing properties to ethanol are studied by a novel thermal pulse method and density functional theory (DFT) simulation. Thermal pulse results reveal that the absorbed O2 molecule dissociates into two individual oxygen adatoms by extracting electrons from ZnO surface layers when temperature is above 443 K. The temperature at which absorbed O2 molecule begins to dissociate is the lowest working temperature for gas sensing...
July 19, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722733/a-polyacrylonitrile-copolymer-silica-template-for-three-dimensional-hierarchical-porous-carbon-as-a-pt-catalyst-support-for-the-oxygen-reduction-reaction
#9
Minmin Liu, Jian Li, Chao Cai, Ziwei Zhou, Yun Ling, Rui Liu
Herein, we report a novel route to construct a hierarchical three-dimensional porous carbon (3DC) through a copolymer-silica assembly. In the synthesis, silica acts as a hard template and leads to the formation of an interconnected 3D macropore, whereas styrene-co-acrylonitrile polymer has been used as both a carbon source and a soft template for micro- and meso-pores. The obtained 3DC materials possess a large surface area (∼550.5 m(2) g(-1)), which facilitates high dispersion of Pt nanoparticles on the carbon support...
July 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28722730/tunable-in-plane-torsional-strength-of-surface-functionalized-two-dimensional-nanomaterials
#10
Qianling Lin, Yinfeng Li, Haimin Yao
In this paper, the in-plane torsional properties of two dimensional nanomaterials are revealed to be tunable by surface functionalization using molecular dynamics simulations. The torsional strengths of both graphene and graphyne under circular shearing are found to first decrease and then increase anomalously with the increase of the hydrogenation ratio. The minimum strength of such U-shaped strength evolution appears at different hydrogenation ratios H for graphene (H = 50%) and graphyne (H = 70%), demonstrating a correlation between hydrogenation and the unit lattices of 2D nanomaterials...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28722465/overview-on-the-surface-functionalization-mechanism-and-determination-of-surface-functional-groups-of-plasma-treated-carbon-nanotubes
#11
Cafer Saka
The use of carbon materials for many applications is due to the unique diversity of structures and properties ranging from chemical bonds between the carbon atoms of the materials to nanostructures, crystallite alignment and microstructures. Carbon nanotubes and other nanoscale carbonaceous materials draw much attention due to their physical and chemical properties such as high strength, high resistance to corrosion, electrical and thermal conductivity, stability and a qualified adsorbent. Carbon-based nanomaterials, which have a relatively large specific area and layered structure, can be used as an adsorbent for efficient removal of organic and inorganic contaminants...
July 19, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28722443/quantum-dot-nanotoxicity-investigations-using-human-lung-cells-and-toxor-electrochemical-enzyme-assay-methodology
#12
Tony O'Hara, Brian Seddon, Andrew O'Connor, Siobhán McClean, Baljit Singh, Emmanuel Iwuoha, Xolile Fuku, Eithne Dempsey
Recent studies have suggested that certain nanomaterials can interfere with optically based cytotoxicity assays resulting in underestimations of nanomaterial toxicity. As a result there has been growing interest in the use of whole cell electrochemical biosensors for nanotoxicity applications. Herein we report application of an electrochemical cytotoxicity assay developed in house (TOXOR) in the evaluation of toxic effects of mercaptosuccinic acid capped cadmium telluride quantum dots (MSA capped CdTe QDs), toward mammalian cells...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722430/multi-amplified-sensing-of-microrna-by-a-small-dna-fragment-driven-enzymatic-cascade-reaction
#13
Eunjung Kim, Philip D Howes, Spencer W Crowder, Molly M Stevens
Combining technological developments such as nanomaterials, DNA nanotechnology, and functional enzymes has great potential to facilitate next generation high performance molecular diagnostic systems. In this work, we describe a microRNA (miRNA) detection assay that combines target recycling and isothermal amplification in an elegantly designed enzyme-mediated cascade reaction. Target recycling is driven by the action of duplex-specific nuclease (DSN), resulting in highly amplified translation of input miRNA to short output DNA fragments...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722241/mineralized-state-of-the-avian-influenza-virus-in-the-environment
#14
Hangyu Zhou, Guangchuan Wang, Xiaoyu Wang, Zhiyong Song, Ruikang Tang
Although the circulation of avian influenza in humans is limited, they can be transmitted from Aves to humans, representing a great challenge. Herein, we suggest that influenza viruses from Aves might exist in a mineralized state due to the high calcium concentrations in the avian intestine. Using two typical influenza viruses as examples, we demonstrate these viruses can self-mineralize in simulated avian intestinal fluid, resulting in egg-like virus-mineral structured composites. The mineralized viruses are more robust, with enhanced infectivity and thermostability...
July 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28721038/toxicity-based-toxicokinetic-toxicodynamic-assessment-of-bioaccumulation-and-nanotoxicity-of-zerovalent-iron-nanoparticles-in-caenorhabditis-elegans
#15
Ying-Fei Yang, Yi-Jun Lin, Chung-Min Liao
Elucidating the relationships between the toxicity-based-toxicokinetic (TBTK)/toxicodynamic (TD) properties of engineered nanomaterials and their nanotoxicity is crucial for human health-risk analysis. Zerovalent iron (Fe(0)) nanoparticles (NPs) are one of the most prominent NPs applied in remediating contaminated soils and groundwater. However, there are concerns that Fe(0)NP application contributes to long-term environmental and human health impacts. The nematode Caenorhabditis elegans is a surrogate in vivo model that has been successfully applied to assess the potential nanotoxicity of these nanomaterials...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28720896/nanoscale-control-of-amyloid-self-assembly-using-protein-phase-transfer-by-host-guest-chemistry
#16
Tae Su Choi, Hong Hee Lee, Young Ho Ko, Kwang Seob Jeong, Kimoon Kim, Hugh I Kim
Amyloid fibrils have recently been highlighted for their diverse applications as functional nanomaterials in modern chemistry. However, tight control to obtain a targeted fibril length with low heterogeneity has not been achieved because of the complicated nature of amyloid fibrillation. Herein, we demonstrate that fibril assemblies can be homogeneously manipulated with desired lengths from ~40 nm to ~10 μm by a phase transfer of amyloid proteins based on host-guest chemistry. We suggest that host-guest interactions with cucurbit[6]uril induce a phase transfer of amyloid proteins (human insulin, human islet amyloid polypeptide, hen egg lysozyme, and amyloid-β 1-40 & 1-42) from the soluble state to insoluble state when the amount of cucurbit[6]uril exceeds its solubility limit in solution...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720288/potential-adverse-effects-of-engineered-nanomaterials-commonly-used-in-food-on-the-mirnome
#17
Jia Pei Lim, Gyeong Hun Baeg, Dinesh Kumar Srinivasan, S Thameem Dheen, Boon Huat Bay
The emergence of nanotechnology has greatly impacted our daily lives. Multiple products, including cosmetics, pharmaceuticals, electronics and food, are produced with incorporation of nanomaterials (NMs). Nanotechnology has yielded many promising benefits, yet, there remains much uncertainty about the hazards of NMs to humans. Hence, it is important to ensure safety of the users. Although many in vitro and in vivo studies have been carried out on the potential toxicity generated by NMs in food, its effects on the microRNA genome (miRNome) involved in the regulation of gene expression have been poorly understood...
July 15, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28719080/near-infrared-quantum-dots-in-biomedical-applications-current-status-and-future-perspective
#18
REVIEW
Peng Zhao, Quan Xu, Jia Tao, Zongwen Jin, Yue Pan, Changmin Yu, Zhiqiang Yu
To address the requirements of biomedical applications including biosensing, bioimaging, and drug delivery, fluorescent nanomaterials served as efficient tools in many cases. Among them, near-infrared quantum dots (NIR QDs) have been used as novel fluorescent labels for their binary advantages of both QDs and NIR light. In this review, through collecting references in recent 10 years, we have introduced basic structures and properties of NIR QDs and summarized the classification and the related synthetic methods...
July 18, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28719073/our-contributions-in-nanochemistry-for-antibiosis-electrocatalyst-and-energy-storage-materials
#19
REVIEW
Jian Zhang, Jing Xu, Yan Wang, Huaiguo Xue, Huan Pang
This account mainly introduces and reviews our recent progress in three projects: antibacterial nanomaterial, electrocatalyst for detecting and electrode nanomaterial of energy storage device, especially the supercapacitor. Besides, our thought and idea about the design, fabrication and application of corresponding nanomaterials are sketched throughout the whole article in order to reveal the structure-function relationship and corresponding mechanism. In the end, we tend to attach importance to the bottleneck of nanomaterial's development and put forward our understanding in this field...
July 18, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28718619/radial-dopant-placement-for-tuning-plasmonic-properties-in-metal-oxide-nanocrystals
#20
Brandon M Crockett, Adam W Jansons, Kristopher M Koskela, Darren W Johnson, James E Hutchison
Doped metal oxide nanocrystals that exhibit tunable localized surface plasmon resonances (LSPRs) represent an intriguing class of nanomaterials that show promise for a variety of applications from spectroscopy to sensing. LSPRs arise in these materials through the introduction of aliovalent dopants and lattice oxygen vacancies. Tuning the LSPR shape and energy is generally accomplished through controlling the concentration or identity of dopants in a nanocrystal, but the lack of finer synthetic control leaves several fundamental questions unanswered regarding the effects of radial dopant placement, size, and nanocrystalline architecture on the LSPR energy and damping...
July 18, 2017: ACS Nano
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