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https://www.readbyqxmd.com/read/28719080/near-infrared-quantum-dots-in-biomedical-applications-current-status-and-future-perspective
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28715860/hemoglobin-bioconjugates-with-surface-protected-gold-nanoparticles-in-aqueous-media-the-stability-depends-on-solution-ph-and-protein-properties
#4
Rafael Del Caño, Lucia Mateus, Guadalupe Sánchez-Obrero, José Manuel Sevilla, Rafael Madueño, Manuel Blázquez, Teresa Pineda
The identification of the factors that dictate the formation and physicochemical properties of protein-nanomaterial bioconjugates are important to understand their behavior in biological systems. The present work deals with the formation and characterization of bioconjugates made of the protein hemoglobin (Hb) and gold nanoparticles (AuNP) capped with three different molecular layers (citrate anions (c), 6-mercaptopurine (MP) and ω-mercaptoundecanoic acid (MUA)). The main focus is on the behavior of the bioconjugates in aqueous buffered solutions in a wide pH range...
July 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28715200/unraveling-the-single-nanometer-thickness-of-shells-of-vesicle-templated-polymer-nanocapsules
#5
Andrew George Richter, Sergey A Dergunov, Mariya D Kim, Sergey N Shmakov, Sai Venkatesh Pingali, Volker S Urban, Yun Liu, Eugene Pinkhassik
The recent emergence of vesicle-templated nanocapsules as a viable platform for diverse applications has heightened the need for detailed structural characterization of nanocapsule shells and for better understanding of surfactant-mediated directed assembly of nanomaterials. Information on the thickness is a critical structural parameter of nanocapsules, where the shell plays a crucial role providing mechanical stability and control of permeability. Here we used small-angle neutron scattering (SANS) to determine the thickness of freestanding and surfactant-stabilized nanocapsules...
July 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28715123/recent-progress-in-the-preparation-assembly-transformation-and-applications-of-layer-structured-nanodisks-beyond-graphene
#6
REVIEW
Xiao Zhang, Hongfei Cheng, Hua Zhang
Layered nanodisks with confined thickness and lateral size have been emerging as a unique type of two-dimensional (2D) nanomaterials in recent years. Inheriting some properties of 2D nanosheets and meanwhile possessing the size-confinement effect, these layered nanodisks exhibit unique optical, electronic, and chemical properties, which endow them with great promise in a wide range of applications. Here, the recent progress of layered nanodisks is introduced. The synthetic strategies, assembly, structural/compositional transformation, and applications of layered nanodisks are systematically described and discussed, with emphasis on their new appealing structures and functions...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28715021/graphitic-nanocapsules-design-synthesis-and-bioanalytical-applications
#7
REVIEW
Ding Ding, Yiting Xu, Yuxiu Zou, Long Chen, Zhuo Chen, Weihong Tan
Graphitic nanocapsules are emerging nanomaterials which are gaining popularity along with the development of carbon nanomaterials. Their unique physical and chemical properties, as well as good biocompatibility, make them desirable agents for biomedical and bioanalytical applications. Through rational design, integrating graphitic nanocapsules with other materials provides them with additional properties which make them versatile nanoplatforms for bioanalysis. In this feature article, we present the use and performance of graphitic nanocapsules in a variety of bioanalytical applications...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28714453/preparation-of-nitrogen-and-sulfur-co-doped-ordered-mesoporous-carbon-for-enhanced-microwave-absorption-performance
#8
Xiaoyan Yuan, Xingkun Xue, Hailong Ma, Shouwu Guo, Laifei Cheng
Ordered mesoporous carbon nanomaterials (OMCs) co-doped with homogeneous nitrogen and sulfur heteroatoms were prepared by nanocasting with the pyrrole oligomer catalyzed by sulfuric acid as a precursor and ordered mesoporous silica SBA-15 as a hard-template. By multi-technique approach utilization, it was demonstrated that the N and S co-doped OMCs possessed high ordered mesoporous structures, large surface areas and homogeneous distribution of heteroatoms. As an microwave absorber, the as-prepared materials exhibited a minimum reflection loss (RL) of -32...
July 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28714205/photothermal-ring-integrated-intraocular-lens-for-high-efficient-eye-disease-treatment
#9
Yao-Xin Lin, Xue-Feng Hu, Yang Zhao, Yu-Juan Gao, Chao Yang, Sheng-Lin Qiao, Yi Wang, Pei-Pei Yang, Jiao Yan, Xin-Ce Sui, Zeng-Ying Qiao, Li-Li Li, Jiang-Bing Xie, Si-Quan Zhu, Xiao-Chun Wu, Yongsheng Li, Lei Wang, Hao Wang
Posterior capsule opacification (PCO) is the most common complication after cataract surgery. So far, the only method for PCO treatment is the precisely focused laser surgery. However, it causes severe complications such as physical damages and neuron impairments. Here, a nanostructured photothermal ring integrated intraocular lens (Nano-IOLs) is reported, in which the rim of commercially available IOLs (C-IOLs) is decorated with silica coated Au nanorods (Au@SiO2 ), for high-efficient prevention of PCO after cataract surgery...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28714145/metallic-mxene-saturable-absorber-for-femtosecond-mode-locked-lasers
#10
Young In Jhon, Joonhoi Koo, Babak Anasori, Minah Seo, Ju Han Lee, Yury Gogotsi, Young Min Jhon
2D transition metal carbides, nitrides, and carbonitides called MXenes have attracted much attention due to their outstanding properties. However, MXene's potential in laser technology is not explored. It is demonstrated here that Ti3 CN, one of MXene compounds, can serve as an excellent mode-locker that can produce femtosecond laser pulses from fiber cavities. Stable laser pulses with a duration as short as 660 fs are readily obtained at a repetition rate of 15.4 MHz and a wavelength of 1557 nm. Density functional theory calculations show that Ti3 CN is metallic, in contrast to other 2D saturable absorber materials reported so far to be operative for mode-locking...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28714119/high-performance-polymers-sandwiched-with-chemical-vapor-deposited-hexagonal-boron-nitrides-as-scalable-high-temperature-dielectric-materials
#11
Amin Azizi, Matthew R Gadinski, Qi Li, Mohammed Abu AlSaud, Jianjun Wang, Yi Wang, Bo Wang, Feihua Liu, Long-Qing Chen, Nasim Alem, Qing Wang
Polymer dielectrics are the preferred materials of choice for power electronics and pulsed power applications. However, their relatively low operating temperatures significantly limit their uses in harsh-environment energy storage devices, e.g., automobile and aerospace power systems. Herein, hexagonal boron nitride (h-BN) films are prepared from chemical vapor deposition (CVD) and readily transferred onto polyetherimide (PEI) films. Greatly improved performance in terms of discharged energy density and charge-discharge efficiency is achieved in the PEI sandwiched with CVD-grown h-BN films at elevated temperatures when compared to neat PEI films and other high-temperature polymer and nanocomposite dielectrics...
July 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28713204/efficient-nh3-scr-removal-of-nox-with-highly-ordered-mesoporous-wo3-%C3%AF-ceo2-at-low-temperatures
#12
Sihui Zhan, He Zhang, Yu Zhang, Qiang Shi, Yi Li, XiuJun Li
To eliminate nitrogen oxides (NOx), a series of highly ordered mesoporous WO3(χ)-CeO2 nanomaterials (χ represents the mole ratio of W/Ce) were synthesized by using KIT-6 as a hard template, which was used for selective catalytic reduction (SCR) to remove NOx with NH3 at low temperatures. Moreover, the nanomaterials were characterized by TEM, XRD, Raman, XPS, BET, H2-TPR, NH3-TPD and in situ DRIFTS. It can be found that all of the prepared mesoporous WO3(χ)-CeO2 (χ = 0, 0.5, 0.75, 1 and 1.25) showed highly ordered mesoporous channels...
April 2017: Applied Catalysis. B, Environmental
https://www.readbyqxmd.com/read/28713002/photo-stimulation-of-persistent-luminescence-nanoparticles-enhances-cancer-cells-death
#13
Gonzalo Ramírez-García, Minerva Martínez-Alfaro, Fanny d'Orlyé, Fethi Bedioui, Nathalie Mignet, Anne Varenne, Silvia Gutiérrez-Granados, Cyrille Richard
Persistent luminescence nanoparticles made of ZnGa1.995Cr0.005O4 (ZGO-NPs) are innovative nanomaterials that emit photons during long periods of time after the end of the excitation, allowing their use as diagnosis probes for in vivo optical imaging. During the excitation process, a part of the energy is stored in traps to further emit photons over long time. However, we observed in this study that some of the energy reduces molecular oxygen to produce reactive oxygen species (ROS). Following this observation, theoxidative stress induction and cytotoxic effects of these NPs were investigated on human breast cancer cells...
July 13, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28712551/facile-synthesis-of-thiol-polyethylene-glycol-functionalized-magnetic-titania-nanomaterials-for-highly-efficient-enrichment-of-n-linked-glycopeptides
#14
Jiawen Wang, Jizong Yao, Nianrong Sun, Chunhui Deng
As protein N-glycosylation involved in generation and development of various cancers and diseases, it is vital to capture glycopeptides from complex biological samples for biomarker discovery. In this work, by taking advantages of the interaction between titania and thiol groups, thiol-polyethylene glycol functionalized magnetic titania nanomaterials (denoted as Fe3O4@TiO2@PEG) were firstly fabricated as an excellent hydrophilic adsorbent of N-linked glycopeptides. On one hand, the special interaction of titanium-thiol makes the synthetic manipulation simple and provides a new idea for design and synthesis of novel nanomaterials; on the other hand, strong magnetic response could realize rapid separation and the outstanding hydrophilicity of polyethylene glycol makes Fe3O4@TiO2@PEG nanomaterials show superior performance for glycopeptides enrichment with ultralow limit of detection (0...
July 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28711837/fullerol-facilitated-transport-of-copper-ions-in-water-saturated-porous-media-influencing-factors-and-mechanism
#15
Yue Yuan, Xianjia Peng
The environmental safety of carbon nanomaterials (CNMs) has become a hot spot of worldwide research work. The high stability, mobility and adsorption capability of CNMs may give rise to the enhancement of heavy metal transport. However, the understanding of facilitated transport of heavy metal ions by CNMs is still limited. In this research, fullerol nanoparticles (C60(OH)n) were used as a typical CNM to investigate its effect on Cu(2+) transport in the water-saturated porous media. Column experiments showed that C60(OH)n could facilitate the transport of Cu(2+)...
July 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28711303/measurement-techniques-of-exposure-to-nanomaterials-in-the-workplace-for-low-and-medium-income-countries-a-systematic-review
#16
REVIEW
Fabio Boccuni, Diana Gagliardi, Riccardo Ferrante, Bruna Maria Rondinone, Sergio Iavicoli
Nanotechnology offers many opportunities but there is still considerable uncertainty about the health risks and how to assess these.In the field of risk analysis for workers potentially exposed to nano-objects and their agglomerates and aggregates (NOAA) different methodological approaches to measure airborne NOAA have been proposed.This study proposes a systematic review of scientific literature on occupational exposure to NOAA in the workplace with the aim to identify techniques of exposure measurement to be recommended in low- and medium-income countries...
June 27, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28710930/immobilization-effects-on-the-photocatalytic-activity-of-cds-quantum-dots-horseradish-peroxidase-hybrid-nanomaterials
#17
Iker Iñarritu, Eduardo Torres, Antonio Topete, José Campos-Terán
The potential use of hybrid nanomaterials based on inorganic optically active nanoparticles known as quantum dots (QDs) and horseradish peroxidase (HRP) has been proposed by several authors as light-controllable nanocatalyzers, moreover, the immobilization within or over silica based supports represents an advantage over bulk-dispersed systems. However, the implications of the immobilization of such hybrid photoactivatable catalyzing systems have not been clarified with detail. Here, we present a thorough study of the functional photoactive efficiency and recycling of immobilized CdS QDs and HRP systems with different configurations, immobilized over silanized silica quartz crystal microbalance (QCM) sensors, allowing an accurate measure of the immobilized mass of each component and its correlation with the initial reaction rate of conversion of Amplex Red (AR) to resorufin...
July 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28710764/twelve-gel-comet-assay-format-for-quick-examination-of-dna-damage-and-repair
#18
Sergey Shaposhnikov, Andrew Collins
The comet assay (single cell gel electrophoresis) is a sensitive, versatile method for detecting DNA damage in eukaryotic cells. The traditional comet assay format has 1 or 2 gels on a microscope slide, 1 sample per slide, and there is a limit of 40 gels per experiment given the size of a typical electrophoresis tank. To increase throughput, we have designed and tested a system with 12 minigels on one slide, allowing analysis of up to 12 times more samples in one electrophoresis run. The novel comet assay format compares well with the traditional technology...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28710516/perspectives-and-challenges-of-photon-upconversion-nanoparticles-part-i-routes-to-brighter-particles-and-quantitative-spectroscopic-studies
#19
REVIEW
Ute Resch-Genger, Hans H Gorris
Lanthanide-doped photon-upconversion nanoparticles (UCNPs) have been the focus of many research activities in materials and life sciences in the last 15 years because of their potential to convert light between different spectral regions and their unique photophysical properties. To fully exploit the application potential of these fascinating nanomaterials, a number of challenges have to be overcome, such as the low brightness, particularly of small UCNPs, and the reliable quantification of the excitation-power-density-dependent upconversion luminescence...
July 14, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28709937/detection-of-lung-cancer-and-egfr-mutation-by-electronic-nose-system
#20
Dekel Shlomi, Manal Abud, Ori Liran, Jair Bar, Naomi Gai-Mor, Maya Ilouze, Amir Onn, Alon Ben-Nun, Hossam Haick, Nir Peled
BACKGROUND: Early detection of lung cancer (LC) has been well established as a significant key point in patient survival and prognosis. New highly sensitive nanoarray sensors for exhaled Volatile Organic Compounds (VOCs) have been developed and coupled with powerful statistical programs may be used when diseases such as LC are suspected. Detection of genetic aberration mutation by nanoarray sensors is the next target. METHODS: Breath samples were taken from patients who were evaluated for suspicious pulmonary lesions...
July 11, 2017: Journal of Thoracic Oncology
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