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nanomaterials, chemistry

B Karimi, B Ramezanzadeh
The reinforcement effect of graphene oxide nanosheets on the mechanical properties of an epoxy coating has been extensively studied. However, the effect of graphene oxide quantum dot (GOQD) as a new unique carbon based nanomaterial (with lateral dimension of 5-6nm and thickness of one carbon atom) on the mechanical properties of epoxy coating has not been reported and compared with GO yet. So this study aims at fabrication of a high-performance polymer composite with unique mechanical properties using GOQD nanosheets...
January 5, 2017: Journal of Colloid and Interface Science
Pik-Ling Lam, Wai-Yeung Wong, Zhaoxiang Bian, Chung-Hin Chui, Roberto Gambari
Nanotechnology manipulates therapeutic agents at the nanoscale for the development of nanomedicines. However, there are current concerns over nanomedicines, mainly related to the possible toxicity of nanomaterials used for health medications. Due to their small size, they can enter the human body more readily than larger sized particles. Green chemistry encompasses the green synthesis of drug-loaded nanoparticles by reducing the use of hazardous materials in the synthesis process, thus reducing the adverse health impacts of pharmaceutics...
January 12, 2017: Nanomedicine
Jordan J Hinman, Kenneth S Suslick
Recent applications of ultrasound to the production of nanostructured materials are reviewed. Sonochemistry permits the production of novel materials or provides a route to known materials without the need for high bulk temperatures, pressures, or long reaction times. Both chemical and physical phenomena associated with high-intensity ultrasound are responsible for the production or modification of nanomaterials. Most notable are the consequences of acoustic cavitation: the formation, growth, and implosive collapse of bubbles, and can be categorized as primary sonochemistry (gas-phase chemistry occurring inside collapsing bubbles), secondary sonochemistry (solution-phase chemistry occurring outside the bubbles), and physical modifications (caused by high-speed jets, shockwaves, or inter-particle collisions in slurries)...
February 2017: Topics in Current Chemistry (Journal)
Viviana R Lopes, Carla Sanchez-Martinez, Maria Strømme, Natalia Ferraz
BACKGROUND: Nanocellulose, and particularly nanofibrillated cellulose (NFC), has been proposed for a diversity of applications in industry and in the biomedical field. Its unique physicochemical and structural features distinguish nanocellulose from traditional materials and enable its use as an advance nanomaterial. However, its nanoscale features may induce unknown biological responses. Limited studies with NFC are available and the biological impacts of its use have not been thoroughly explored...
January 10, 2017: Particle and Fibre Toxicology
Leoni A Kunz-Schughart, Anna Dubrovska, Claudia Peitzsch, Alexander Ewe, Achim Aigner, Samuel Schellenburg, Michael H Muders, Silke Hampel, Giuseppe Cirillo, Francesca Iemma, Rainer Tietze, Christoph Alexiou, Holger Stephan, Kristof Zarschler, Orazio Vittorio, Maria Kavallaris, Wolfgang J Parak, Lutz Mädler, Suman Pokhrel
Cancer is one of the leading non-communicable diseases with highest mortality rates worldwide. About half of all cancer patients receive radiation treatment in the course of their disease. However, treatment outcome and curative potential of radiotherapy is often impeded by genetically and/or environmentally driven mechanisms of tumor radioresistance and normal tissue radiotoxicity. While nanomedicine-based tools for imaging, dosimetry and treatment are potential keys to the improvement of therapeutic efficacy and reducing side effects, radiotherapy is an established technique to eradicate the tumor cells...
December 14, 2016: Biomaterials
Autumn L Menas, Naveena Yanamala, Mariana T Farcas, Maria Russo, Sherri Friend, Philip M Fournier, Alexander Star, Ivo Iavicoli, Galina V Shurin, Ulla B Vogel, Bengt Fadeel, Donald Beezhold, Elena R Kisin, Anna A Shvedova
Nanocellulose (NC) is emerging as a highly promising nanomaterial for a wide range of applications. Moreover, many types of NC are produced, each exhibiting a slightly different shape, size, and chemistry. The main objective of this study was to compare cytotoxic effects of cellulose nanocrystals (CNC) and nanofibrillated cellulose (NCF). The human lung epithelial cells (A549) were exposed for 24 h and 72 h to five different NC particles to determine how variations in properties contribute to cellular outcomes, including cytotoxicity, oxidative stress, and cytokine secretion...
December 24, 2016: Chemosphere
Shujun Yu, Xiangxue Wang, Rui Zhang, Tongtong Yang, Yuejie Ai, Tao Wen, Wei Huang, Tasawar Hayat, Ahmed Alsaedi, Xiangke Wang
Although graphene oxide (GO) has been used in multidisciplinary areas due to its excellent physicochemical properties, its environmental behavior and fate are still largely unclear. In this study, batch experiments, spectroscopy analysis and theoretical calculations were addressed to promote a more comprehensive understanding toward the coagulation behavior of GO onto TiO2 under various environmental conditions (pH, co-existing ions, temperature, etc.). The results indicated that neutral pH was beneficial to the removal of GO due to the electrostatic interaction...
January 3, 2017: Scientific Reports
Ali Jawaid, Justin Che, Lawrence F Drummy, John Bultman, Adam Waite, Ming-Siao Hsiao, Richard A Vaia
Transition Metal Dichalcogenides (TMDs) have attracted considerable attention in a diverse array of applications due to the breadth of possible property suites relative to other low dimensional nanomaterials (e.g. graphene, aluminosilicates). Here, we demonstrate an alternative methodology for the exfoliation of bulk crystallites of Group V-VII layered TMDs under quiescent, bench-top conditions using mild redox chemistry. Anionic polyoxometalate species generated from edge sites adsorb to the TMD surface and create coulombic repulsion that drives layer separation without the use of shear forces...
December 29, 2016: ACS Nano
Xiaofei You, Siwei Yang, Jipeng Li, Yuan Deng, Lianqi Dai, Xiong Peng, Haoguang Huang, Jing Sun, Gang Wang, Peng He, Guqiao Ding, Xiaoming Xie
Scalable fabrication of water-dispersible graphene (W-Gr) is highly desirable yet technically challenging for most practical applications of graphene. Herein, a green and mild oxidation strategy to prepare bulk W-Gr (dispersion, slurry, and powder) with high yield was proposed by fully exploiting structure defects of thermally reduced graphene oxide (TRGO) and oxidizing radicals generated from hydrogen peroxide (H2O2). Owing to the increased carboxyl group from the mild oxidation process, the obtained W-Gr can be redispersed in low-boiling solvents with a reasonable concentration...
January 10, 2017: ACS Applied Materials & Interfaces
Basudev Maity, Takafumi Ueno
Protein assemblies have recently become known as potential molecular scaffolds for applications in materials science and bio-nanotechnology. Efforts to design protein assemblies for construction of protein-based hybrid materials with metal ions, metal complexes, nanomaterials and proteins now represent a growing field with a common aim of providing novel functions and mimicking natural functions. However, the important roles of protein assemblies in coordination and biosupramolecular chemistry have not been systematically investigated and characterized...
December 28, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Lucian Mocan, Cristian Matea, Flaviu A Tabaran, Ofelia Mosteanu, Teodora Pop, Cosmin Puia, Lucia Agoston-Coldea, Diana Gonciar, Erszebet Kalman, Gabriela Zaharie, Cornel Iancu, Teodora Mocan
There are serious systemic infections associated with methicillin-resistant Staphylococcus aureus (MRSA) and several other types of bacteria leading to the deaths of millions of people globally. This type of mortality is generally caused by the increasing number of antibiotic-resistant organisms, a consequence of evolution via natural selection. After the synthesis of gold nanoparticles (GNPs) by wet chemistry, bio-functionalization with IgG molecules was performed. Following administration of IgG-GNPs to MRSA cultures at various concentrations and various incubation time laser irradiation was performed...
December 23, 2016: Scientific Reports
Hao Liang, Feifei Lin, Zijie Zhang, Biwu Liu, Shuhui Jiang, Qipeng Yuan, Juewen Liu
Using nanomaterials to achieve functional enzyme mimics (nanozymes) is attractive for both applied and fundamental research. Laccases are multi-copper oxidases highly important for biotechnology and environmental remediation. In this work, we report an exceptionally simple yet functional laccase mimic based on guanosine monophosphate (GMP) coordinated copper. It forms an amorphous metal-organic framework (MOF) material. The ratio of copper and GMP is 3:4 as determined by isothermal titration calorimetry. It has excellent laccase-like activity and converts a diverse range of phenol containing substrates such as hydroquinone, naphthol, catechol and epinephrine...
December 22, 2016: ACS Applied Materials & Interfaces
Tianjiao Xia, Yu Qi, Jing Liu, Zhichong Qi, Wei Chen, Mark R Wiesner
Transport of negatively charged nanoparticles in porous media is largely affected by cations. To date, little is known about how cations of the same valence may affect nanoparticle transport differently. We observed that the effects of cations on the transport of graphene oxide (GO) and sulfide-reduced GO (RGO) in saturated quartz sand obeyed the Hofmeister series; that is, transport-inhibition effects of alkali metal ions followed the order of Na(+) < K(+) < Cs(+), and those of alkaline earth metal ions followed the order of Mg(2+) < Ca(2+) < Ba(2+)...
January 5, 2017: Environmental Science & Technology
Hailin Tang, Yuanyi Zheng, Yu Chen
As a special cross-disciplinary research frontier, nanoultrasonic biomedicine refers to the design and synthesis of nanomaterials to solve some critical issues of ultrasound (US)-based biomedicine. The concept of nanoultrasonic biomedicine can also overcome the drawbacks of traditional microbubbles and promote the generation of novel US-based contrast agents or synergistic agents for US theranostics. Here, we discuss the recent developments of material chemistry in advancing the nanoultrasonic biomedicine for diverse US-based bio-applications...
December 19, 2016: Advanced Materials
Swadhin K Saha, Priya Roy, Maloy K Mondal, Debiprasad Roy, Prajna Gayen, Pranesh Chowdhury, Santi P Sinha Babu
The gold nanoparticles (AuNPs) have been synthesized biogenically by using black pepper (Piper nigrum) extract according to the principles of green chemistry in presence and absence of a biopolymer, chitosan. A comprehensive study (up to cellular level) on the antifilarial (against Setaria cervi) activity of AuNPs has been made for the first time with a view to use it clinically. The bioactivity of biopolymer capped biogenic AuNP increases significantly compared to simple biogenic AuNP. The biopolymer plays an important role in inspiring AuNP through its inherent positive charges and hydrophobicity...
February 10, 2017: Carbohydrate Polymers
Rosario Núñez, Màrius Tarrés, Albert Ferrer-Ugalde, Fabrizia Fabrizi de Biani, Francesc Teixidor
Icosahedral boranes, carboranes, and metallacarboranes are extraordinarily robust compounds with desirable properties such as thermal and redox stability, chemical inertness, low nucleophilicity, and high hydrophobicity, making them attractive for several applications such as medicine, nanomaterials, molecular electronics, energy, catalysis, environmental chemistry, and other areas. The hydrogen atoms in these clusters can be replaced by convenient groups that open the way to a chemical alternative to conventional "organic" or "organometallic" realms...
December 14, 2016: Chemical Reviews
Chunhe Yao, Cristina Carlisi, Yuning Li, Da Chen, Jianfu Ding, Yong-Lai Feng
Increasing use of single-walled carbon nanotubes (SWCNTs) necessitates a novel method for hazard risk assessment. In this work, we investigated the interaction of several types of commercial SWCNTs with single-stranded (ss) and double-stranded (ds) DNA oligonucleotides (20-mer and 20 bp). Based on the results achieved, we proposed a novel assay that employed the DNA interaction potency to assess the hazard risk of SWCNTs. It was found that SWCNTs in different sizes or different batches of the same product number of SWCNTs showed dramatically different potency of interaction with DNAs...
2016: PloS One
Tushar D Rane, Andrea M Armani
Nanomaterials can be synthesized from a wide range of material systems in numerous morphologies, creating an extremely diverse portfolio. As result of this tunability, these materials are emerging as a new class of nanotherapeutics and imaging agents. One particularly interesting nanomaterial is the gold nanoparticle. Due to its inherent biocompatibility and tunable photothermal behavior, it has made a rapid transition from the lab setting to in vivo testing. In most nanotherapeutic applications, the efficacy of the agent is directly related to the target of interest...
2016: PloS One
Sijia Yi, Sean David Allen, Yu-Gang Liu, Brian Zhou Ouyang, Xiaomo Li, Punn Augsornworawat, Edward Benjamin Thorp, Evan Alexander Scott
Atherosclerosis, a leading cause of heart disease, results from chronic vascular inflammation that is driven by diverse immune cell populations. Nanomaterials may function as powerful platforms for diagnostic imaging and controlled delivery of therapeutics to inflammatory cells in atherosclerosis, but efficacy is limited by nonspecific uptake by cells of the mononuclear phagocytes system (MPS). MPS cells located in the liver, spleen, blood, lymph nodes, and kidney remove from circulation the vast majority of intravenously administered nanomaterials regardless of surface functionalization or conjugation of targeting ligands...
December 27, 2016: ACS Nano
Julia A Braunger, Mattias Björnmalm, Nathan A Isles, Jiwei Cui, Timothy M A Henderson, Andrea J O'Connor, Frank Caruso
The extracellular matrix (ECM) that surrounds cells in vivo represents a biological barrier for nanomaterials in biomedicine. Herein, we present a system for investigating the interactions between circulating polymer particles and ECM components in vitro using a commercially available flow-based device. We use this system to show how material-dependent interactions of two different particle types-one assembled using poly(ethylene glycol) (PEG) and one prepared using poly(methacrylic acid) (PMA)-affect their interactions with basement membrane extracts during in vitro circulation, with PEG particles remaining in circulation longer than PMA particles...
December 9, 2016: Biomaterials Science
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