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Eulogio J Llorent-Martínez, Lucía Molina-García, Gema M Durán, Antonio Ruiz-Medina, Ángel Ríos
Graphene quantum dots (GQD) were determined in water samples using terbium-sensitized luminescence (TSL). Terbium ions complex with GQD due to the carboxylic groups that are usually present in these nanomaterials, increasing the luminescence signal of terbium. In Tb(III)-GQD complexes, GQD absorb energy at their characteristic excitation wavelength and transfer it to terbium ion, which emits at its particular emission wavelength. The analytical signal, measured at λexc =257nm and λem =545nm, increases proportionally to GQD concentration between 50 and 500μgL-1 ...
March 7, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Vahid Mirshafiee, Bingbing Sun, Chong Hyun Chang, Yu-Pei Liao, Wen Jiang, Jinhong Jiang, Xiangsheng Liu, Xiang Wang, Tian Xia, Andre E Nel
The liver and the mononuclear phagocyte system (MPS) is a frequent target for engineered nanomaterials (ENMs), either as a result of particle uptake and spread from primary exposure sites or systemic administration of therapeutic and imaging nanoparticles. In this study, we performed a comparative analysis of the toxicological impact of 29 metal oxide (MOx) nanoparticles (NPs), some commonly used in consumer products, in transformed or primary Kupffer cells (KCs) and hepatocytes. Not only did we observe differences between KC and hepatocytes, but also differences in the toxicological profiles of transition metal oxides (TMOs, e...
March 15, 2018: ACS Nano
Bingbo Zhang, Wei Yan, Yanjing Zhu, Weitao Yang, Wenjun Le, Bingdi Chen, Rongrong Zhu, Liming Cheng
Patients are increasingly being diagnosed with neuropathic diseases, but are rarely cured because of the loss of neurons in damaged tissues. This situation creates an urgent clinical need to develop alternative treatment strategies for effective repair and regeneration of injured or diseased tissues. Neural stem cells (NSCs), highly pluripotent cells with the ability of self-renewal and potential for multidirectional differentiation, provide a promising solution to meet this demand. However, some serious challenges remaining to be addressed are the regulation of implanted NSCs, tracking their fate, monitoring their interaction with and responsiveness to the tissue environment, and evaluating their treatment efficacy...
March 15, 2018: Advanced Materials
Congyu Wu, Yajing Shen, Mengwei Chen, Kun Wang, Yongyong Li, Yu Cheng
Remote control of cells and the regulation of cell events at the molecular level are of great interest in the biomedical field. In addition to chemical compounds and genes, mechanical forces play a pivotal role in regulating cell fate, which have prompted the rapid growth of mechanobiology. From a perspective of nanotechnology, magnetic nanomaterials (MNs) are an appealing option for mechanotransduction due to their capabilities in spatiotemporal manipulation of mechanical forces via the magnetic field. As a newly developed paradigm, magneto-mechanotransduction is harnessed to physically regulate cell fate for biomedical applications...
March 15, 2018: Advanced Materials
Yan Zhan, Yingliang Liu, Hongru Zu, Yanxian Guo, Shuangshuang Wu, Haiyao Yang, Zhiming Liu, Bingfu Lei, Jianle Zhuang, Xuejie Zhang, Di Huang, Chaofan Hu
Different from their bulk counterparts, plasmonic molybdenum oxide nanomaterials display superior optical and electronic properties, but unfortunately, phase-controlled synthesis of molybdenum oxide nanomaterials with multifunctional performances still remains a challenge. To actualize this, a surfactant-free solvothermal strategy was proposed to fabricate molybdenum oxide nanomaterials with a tunable phase. Encouragingly, the as-prepared molybdenum dioxide nanoparticles (MoO2 NPs) exhibit intense near-infrared (NIR) absorption attributed to the localized surface plasmon resonance (LSPR) effect, which results in their application as a surface enhanced Raman scattering (SERS) substrate to detect trace amounts of molecular species including Rhodamine 6G (R6G), crystal violet (CV), IR-780 iodide (IR780) and methylene blue (MB)...
March 15, 2018: Nanoscale
Wei Wang
Nanomaterials exhibit structural and functional heterogeneity among individual nanoparticles, thus requiring a capability to study single nanoparticles. While electron microscopes often provide static images of their chemical composition, morphology and structure, imaging the chemical activity of single nanoparticles is highly desirable for exploring the structure-activity relationship via a bottom-up strategy, to understand their microscopic reaction mechanisms and kinetics, and to identify a minority subpopulation with extraordinary activity...
March 15, 2018: Chemical Society Reviews
Xiaju Cheng, Xiaohu Ni, Renfei Wu, Yu Chong, Xingfa Gao, Cuicui Ge, Jun-Jie Yin
AIM: To develop the potential application of carbon nanomaterials as antioxidants calls for better understanding of how the specific structure affects their antioxidant activity. MATERIALS & METHODS: Several typical carbon nanomaterials, including graphene quantum dots and fullerene derivatives were characterized and their radical scavenging activities were evaluated; in addition, the in vitro and in vivo radioprotection experiments were performed. RESULTS: These carbon nanomaterials can efficiently scavenge free radicals in a structure-dependent manner...
March 15, 2018: Nanomedicine
Jinlong Liu, Yao Zheng, Yan Jiao, Zhenyu Wang, Zhouguang Lu, Anthony Vasileff, Shi-Zhang Qiao
Conventional development of nanomaterials for efficient electrocatalysis is largely based on performance-oriented trial-and-error/iterative approaches, while a rational design approach at the atomic/molecular level is yet to be found. Here, inspired by a fundamental understanding of the mechanism for both oxygen and hydrogen evolution half reactions (OER/HER), a unique strategy is presented to engineer RuO2 for superior alkaline water electrolysis through coupling with NiO as an efficient bifunctional promoter...
March 15, 2018: Small
Xiaoyuan Ji, Houyu Wang, Bin Song, Binbin Chu, Yao He
Biochemical analysis in reliable, low-toxicity, and real-time manners are essentially important for exploring and unraveling biological events and related mechanisms. Silicon nanomaterial-based sensors and probes have potentiality to satisfy the above-mentioned requirements. Herein, we present an overview of the recent significant improvement in large-scale and facile synthesis of high-quality silicon nanomaterials and the research progress of biosensing and bioimaging analysis based on silicon nanomaterials...
2018: Frontiers in Chemistry
Daejong Yang, Jaehwan Lee, Donghwan Kim, Incheol Cho, Jong G Ok, Inkyu Park
We propose ZnO nanowire and TiO2 nanotube based light sensors on flexible polymer substrates fabricated by localized hydrothermal synthesis and liquid phase deposition (LPD). This method realized simple and cost-effective in-situ synthesis and integration of ZnO and TiO2 one dimensional nanomaterials. The fabricated sensor devices with ZnO nanowires and TiO2 nanotubes show very high sensitivity and quick response to the ultraviolet (UV) and ambient light, respectively. In addition, our direct synthesis and integration method made mechanical robustness under external loading such as static and cyclic bending because of both the strong bonding between nanomaterial and electrode...
March 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Vanessa Koehlé-Divo, Carole Cossu-Leguille, Sandrine Pain-Devin, Cécile Simonin, Carole Bertrand, Bénédicte Sohm, Catherine Mouneyrac, Simon Devin, Laure Giambérini
The rapid development of nanotechnology and the increased use of nanomaterials in products used in everyday life have raised the question of the potential release of nanoparticles into the aquatic environment. Their fate and effects in natural ecosystems are not currently well understood but harmful effects of nanoparticles have been demonstrated at low concentrations on some freshwater and marine species. Cerium dioxide nanoparticles (CeO2 NPs) are produced in large quantities and used in products in many different fields, such as automotives or optics...
February 27, 2018: Aquatic Toxicology
Hui Sun, Yuanxiu Hong, Yuejing Xi, Yijie Zou, Jingyi Gao, Jianzhong Du
Antimicrobial peptides (AMPs) have been attracting much attention due to their excellent antimicrobial efficiency and low rate in driving antimicrobial resistance (AMR) which has been increasing globally to alarming levels. Conjugation of AMPs into functional polymers not only preserves excellent antimicrobial activities but reduces the toxicity and offers more functionalities, which brings new insight towards developing multifunctional biomedical materials such as hydrogels, polymer vesicles, polymer micelles, etc...
March 14, 2018: Biomacromolecules
Jitendra B Maurya, Alexandre François, Yogendra K Prajapati
One-dimensional photonic crystal (1DPC) sensors have emerged as contenders for traditional surface plasmon resonance sensors, owing to their potential for the detection of bigger molecules and particles due to their higher interaction volume in the sensing medium. Two-dimensional layered nanomaterials, most notably graphene and dichalcogenides (e.g., MoS₂, MoSe₂, WS₂, and WSe₂), have shown higher refractive index sensitivity because of their absorption as well as adsorption property. The proposed configuration of 1DPC presented consists of alternate layers of the aforementioned nanomaterials and silicon...
March 14, 2018: Sensors
Luca Malfatti, Plinio Innocenzi
Carbon dots are an emerging class of carbon-based nanostructures produced by low-cost raw materials which exhibit a widely-tunable photoluminescence and a high quantum yield. The potential of these nanomaterials as a substitute of semiconductor quantum dots in optoelectronics and biomedicine is very high, however they need a customized chemistry to be integrated in host-guest systems or functionalized in core-shell structures. This review is focused on recent advances of the sol-gel chemistry applied to the C-dots technology...
March 14, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Liuqi Peng, Xuan Mei, Jun He, Jiekun Xu, Weiku Zhang, Ruizheng Liang, Min Wei, David G Evans, Xue Duan
2D nanomaterials have attracted considerable research interest in drug delivery systems, owing to their intriguing quantum size and surface effect. Herein, Gd3+ -doped monolayered-double-hydroxide (MLDH) nanosheets are prepared via a facile bottom-up synthesis method, with a precisely controlled composition and uniform morphology. MLDH nanosheets as drug carrier are demonstrated in coloading of doxorubicin and indocyanine green (DOX&ICG), with an ultrahigh drug loading content (LC) of 797.36% and an encapsulation efficiency (EE) of 99...
March 14, 2018: Advanced Materials
Shu Fen Tan, Sanoj Raj, Geeta Bisht, Harshini V Annadata, Christian A Nijhuis, Petr Král, Utkur Mirsaidov
Self-assembly of solvated nanoparticles (NPs) is governed by numerous competing interactions. However, relatively little is known about the time-dependent mechanisms through which these interactions enable and guide the nanoparticle self-assembly process. Here, using in situ transmission electron microscopy imaging combined with atomistic modeling, it is shown that the forces governing the self-assembly of hydrophobic nanoparticles change with the nanoparticle shapes. By comparing how gold nanospheres, nanocubes, nanorods, and nanobipyramids assemble, it is shown that the strength of the hydrophobic interactions depends on the overlap of the hydrophobic regions of the interacting nanoparticle surfaces determined by the nanoparticle shapes...
March 14, 2018: Advanced Materials
Yali Ma, Yu Zhang, Xue Wang, Meihong Fan, Kaiqian Li, Tao Wang, Yunling Liu, Qisheng Huo, Zhen-An Qiao, Sheng Dai
With unique physical and chemical properties and porous architectures, mesoporous transition metal hydroxide (MMHO) and oxide (MMO) nanospheres hold great potential for various applications in drug delivery, catalysis, energy storage and conversion. However, synthesizing MMHO and MMO with well-defined mesostructures remains a great challenge because of the weak interaction between surfactants and metal precursors. Herein we describe a chelation-induced cooperative self-assembly system in which the weak interaction can be cooperatively amplified through the use of a chelating ligand acting as a co-template...
March 14, 2018: Nanoscale
Carlos E Catalano
Viral particles provide an attractive platform for the engineering of semisynthetic therapeutic nanoparticles. They can be modified both genetically and chemically in a defined manner to alter their surface characteristics, for targeting specific cell types, to improve their pharmacokinetic features and to attenuate (or enhance) their antigenicity. These advantages derive from a detailed understanding of virus biology, gleaned from decades of fundamental genetic, biochemical, and structural studies that have provided mechanistic insight into virus assembly pathways...
March 13, 2018: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
Parker W Lee, Jonathan K Pokorski
Injectable or implantable poly(lactic-co-glycolic acid) (PLGA) devices for the sustained delivery of proteins have been widely studied and utilized to overcome the necessity of repeated administrations for therapeutic proteins due to poor pharmacokinetic profiles of macromolecular therapies. These devices can come in the form of microparticles, implants, or patches depending on the disease state and route of administration. Furthermore, the release rate can be tuned from weeks to months by controlling the polymer composition, geometry of the device, or introducing additives during device fabrication...
March 13, 2018: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
Hyosung An, Touseef Habib, Smit Shah, Huili Gao, Miladin Radovic, Micah J Green, Jodie L Lutkenhaus
Stretchable, bendable, and foldable conductive coatings are crucial for wearable electronics and biometric sensors. These coatings should maintain functionality while simultaneously interfacing with different types of surfaces undergoing mechanical deformation. MXene sheets as conductive two-dimensional nanomaterials are promising for this purpose, but it is still extremely difficult to form surface-agnostic MXene coatings that can withstand extreme mechanical deformation. We report on conductive and conformal MXene multilayer coatings that can undergo large-scale mechanical deformation while maintaining a conductivity as high as 2000 S/m...
March 2018: Science Advances
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