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chemistry. nanocomposite

Eutilério F C Chaúque, J Catherine Ngila, Sekhar C Ray, Lwazi Ndlwana
Bimetallic nanoparticles are effective for the removal of organic pollutants from environmental water samples through catalytic degradation reactions. Hence, this work reports on the preparation of Fe/Ag bimetallic nanoparticles immobilized on electrospun polyacrylonitrile nanofibers (PAN NFs) pre-functionalized with EDTA and ethylenediamine (EDA) chelating agents. Characterization techniques included attenuated total reflectance coupled to Fourier transform infrared spectrometer (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA)...
February 13, 2019: Journal of Environmental Management
Devaraj Bharathi, R Ranjithkumar, B Chandarshekar, V Bhuvaneshwari
The surface coating of metal oxide nanoparticles using biopolymer chitosan has evolved to become an important area of polymer nanotechnology. Herein, we report the preparation of chitosan coated zinc oxide (CS-ZnO) nanocomposite for the first time by a green chemistry approach using bioflavonoid rutin. The formation of CS-ZnO nanocomposite was preliminarily confirmed by color change and UV-Visible spectroscopy. FE-SEM images revealed agglomeration of CS-ZnO nanocomposite having predominant rod shaped structure...
February 13, 2019: International Journal of Biological Macromolecules
Javad Shamsi, Alexander S Urban, Muhammad Imran, Luca De Trizio, Liberato Manna
Metal halide perovskites represent a flourishing area of research, which is driven by both their potential application in photovoltaics and optoelectronics and by the fundamental science behind their unique optoelectronic properties. The emergence of new colloidal methods for the synthesis of halide perovskite nanocrystals, as well as the interesting characteristics of this new type of material, has attracted the attention of many researchers. This review aims to provide an up-to-date survey of this fast-moving field and will mainly focus on the different colloidal synthesis approaches that have been developed...
February 13, 2019: Chemical Reviews
Fei Liu, Xiaolin Zhang, Chao Shan, Bingcai Pan
Millispherical nanocomposites are promising for water decontamination combining the high reactivity of the confined nanoparticles and the excellent hydrodynamic properties of the supporting host. However, the effect of three-dimensional (3-D) distribution of the nanoparticles inside the host on the performance of the nanocomposite was highly dependent on the specific decontamination process. In this study, four D201-ZVI nanocomposites from peripheral to uniform 3-D distributions of nZVI were prepared to evaluate the effect of 3-D distribution of the confined nanoparticles inside the host beads on the removal of EDTA-chelated Cu(II)...
February 11, 2019: Environmental Science and Pollution Research International
Xiang Yu, Vincent De Waele, Axel Löfberg, Vitaly Ordomsky, Andrei Y Khodakov
Chemical utilization of vast fossil and renewable feedstocks of methane remains one of the most important challenges of modern chemistry. Herein, we report direct and selective methane photocatalytic oxidation at ambient conditions into carbon monoxide, which is an important chemical intermediate and a platform molecule. The composite catalysts on the basis of zinc, tungstophosphoric acid and titania exhibit exceptional performance in this reaction, high carbon monoxide selectivity and quantum efficiency of 7...
February 11, 2019: Nature Communications
Zhe Li, Yue Wu
MXenes, a bourgeoning class of 2D transition metal carbides, are of considerable interest in catalysis due to their rich surface chemistry, tunable electronic structures, and thermal stability. Here, recent conceptual advances in applying MXenes and their nanocomposites in (photo)electrocatalysis and conventional heterogeneous catalysis are highlighted. In addition, the nature of active sites in the MXene-based catalysts are discussed and the significance and challenges in the future development of catalysts using MXenes as the platforms are summarized...
January 22, 2019: Small
Zhenyu Lu, Xiaotian Lu, Yanhui Zhong, Yufei Hu, Gongke Li, Runkun Zhang
Isomers discrimination plays a vital role in modern chemistry, and development of efficient and rapid method to achieve this aim has attracted a great deal of interest. In this work, a novel carbon dot-decorated chiral porous organic cage hybrid nanocomposite (CD@RCC3) was prepared and used to fabricate fluorescent sensor. The resultant CD@RCC3 was characterized by using a range of techniques, finding that CD@RCC3 possesses strong and stable fluorescent property in common organic solvents, especially it exhibits chiral property...
March 7, 2019: Analytica Chimica Acta
Wallace R Rolim, Joana C Pieretti, Débora L S Renó, Bruna A Lima, Mônica H M Nascimento, Felipe N Ambrósio, Christiane B Lombello, Marcelo Brocchi, Ana Carolina Santos de Souza, Amedea B Seabra
Due to their antibacterial activity, silver nanoparticles (AgNPs) have been explored in biomedical applications. Similarly, nitric oxide (NO) is an important endogenous free radical with an antimicrobial effect and toxicity towards cancer cells that plays pivotal roles in several processes. In this work, biogenic AgNPs were prepared using green tea extract and the principles of green chemistry, and the NO donor S-nitrosoglutathione (GSNO) was prepared by the nitrosation of glutathione. To enhance the potentialities of GSNO and AgNPs in biomedical applications, the NO donor and metallic nanoparticles were individually or simultaneously incorporated into polymeric solid films of poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG)...
January 17, 2019: ACS Applied Materials & Interfaces
Mingqiang Wang, Ahmet Emre, Siu On Tung, Alycia Gerber, Dandan Wang, Yudong Huang, Volkan Cecen, Nicholas A Kotov
Batteries based on divalent metals, such as Zn/Zn+2 pair, represent attractive alternatives to lithium-ion chemistry due to their high safety, reliability, earth-abundance and energy density. However, archetypal Zn batteries are bulky, inflexible, non-rechargeable, and contain a corrosive electrolyte. Suppression of the anodic growth of Zn dendrites is essential for resolution of these problems and requires materials with nanoscale mechanics sufficient to withstand mechanical deformation from stiff Zn dendrites...
January 4, 2019: ACS Nano
Islam Ibrahim, Chrysoula Athanasekou, Georgios Manolis, Andreas Kaltzoglou, Nektarios K Nasikas, Fotios Katsaros, Eamonn Devlin, Athanassios G Kontos, Polycarpos Falaras
TiO2 photocatalysis is an advanced process, employed worldwide for the oxidation of organic compounds, that leads to significant technological applications in the fields of health and environment. The use of the photocatalytic approach in reduction reactions seems very promising and can open new horizons for green chemistry synthesis. For this purpose, titanium dioxide nanotubes (TNTs) were developed in autoclave conditions using TiO2 P25 as a precursor material. Based on these nanotubular substrates, TiO2 /CoFe2 O4 (TCF) nanocomposites were further obtained by wet impregnation method...
December 24, 2018: Journal of Hazardous Materials
Monika Benkocká, Simona Lupínková, Tereza Knapová, Kateřina Kolářová, Jindřich Matoušek, Petr Slepička, Václav Švorčík, Zdeňka Kolská
Surface of ultra-high-molecular-weight polyethylene (UHMWPE) was modified by chemical methods. Surface was firstly activated by Piranha solution and then grafted with selected amino-compounds (cysteamine, ethylenediamine or chitosan). The next step was grafting of some borane cluster compounds, highly fluorescent borane hydride cluster anti-B18 H22 or its thiolated derivative 4,4'-(HS)2 -anti-B18 H20 . Polymer foils were studied using various methods to characterize surface chemistry (X-ray photoelectron spectroscopy), roughness and morphology (atomic force microscopy, scanning electron microscopy), chemistry and polarity (electrokinetic analysis), wettability (goniometry) and photophysical properties (UV-Vis spectroscopy) before and after modification steps...
March 2019: Materials Science & Engineering. C, Materials for Biological Applications
Jin Yin, Jiarui Hou, Shasha Huang, Na Li, Ming Zhong, Zejun Zhang, Yong Geng, Beibei Ding, Yuwei Chen, Yongxin Duan, Jianming Zhang
Chitin nanofibers (ChNFs) have emerged as a rising nanomaterial due to their excellent mechanical properties, biocompatibility and biodegradability etc. Herein, carbonylated ChNFs (C-ChNFs) and zwitterionic ChNFs (NC-ChNFs) decorated with both amino (-NH2 ) and carboxyl (-COOH) groups were used to prepare ChNFs/natural rubber (NR) nanocomposite films by dip molding method, respectively. The results showed that C-ChNFs had better dispersion than that of NC-ChNFs in NRL matrix. Moreover, C-ChNFs/NR nanocomposite films demonstrated obvious pH-responsiveness owing to the association and disassociation of the hydrogen bonding between C-ChNFs under various pH conditions...
March 1, 2019: Carbohydrate Polymers
A H Bhat, Imran Khan, Mohd Amil Usmani, Reddicherla Umapathi, Salma M Z Al-Kindy
Cellulose is a renewable natural fiber, which has gained enormous and significant research interest and evolved as the prime and promising candidate for replacing synthetic fibers. The various sources of cellulose, which is one of the world's most ubiquitous and renewable biopolymer resources, include trees, plants, tunicate and bacteria. The renewable biomaterial in the form of nanocellulose and its composites have been included in this review having the broad range of medical applications, viz.; tissue engineering, cardiovascular surgery, dental, pharmaceuticals, veterinary, adhesion barriers and skin therapy...
December 26, 2018: International Journal of Biological Macromolecules
Francisco Lossada, Jiaqi Guo, Dejin Jiao, Saskia Groeer, Elodie Bourgeat-Lami, Damien Montarnal, Andreas Walther
Nanopapers formed from cellulose nanofibrils (CNFs) are an emerging and sustainable class of high performance materials. The diversification and improvement of the mechanical and functional property space critically depend on integration of CNFs with rationally designed, tailor-made polymers following bioinspired nanocomposite designs. Here we combine for the first time CNFs with colloidal dispersions of vitrimer nanoparticles (VP) into mechanically coherent nanopaper materials. The choice of low glass transition, hydrophobic vitrimers derived from fatty acids and polydimethylsiloxane (PDMS), and achieving dynamic reshuffling of crosslinks through transesterification reactions enables excellent compatibility and covalent attachment onto the CNF surfaces...
December 27, 2018: Biomacromolecules
Cahit Benel, Thomas Reisinger, Robert Kruk, Horst Hahn
The unique functional properties of nanocomposites meet many of the material requirements sought after in numerous applications of today's high-tech industry. This, in turn, inspires material scientists to devise new methods that can further expand the palette of available nanocomposites. Precise control over the chemistry, morphology, and microstructure of nanocomposites' constituents promises the eventual ability to design any composite material for any specific requirement. However, today's synthesis methods still lack the ability to simultaneously control all chemical, morphological, and microstructural features of nanocomposites in a one-step process...
December 27, 2018: Advanced Materials
Xi Chen, Lingqiao Li, Tong Wei, David C Venerus, John M Torkelson
Conventional polymer composite networks cannot be recycled for high-value applications because of the presence of permanent covalent cross-links. We have developed reprocessable polyhydroxyurethane network nanocomposites using silica nanoparticles with different surface functionality as reinforcing fillers. The property recovery after reprocessing is a function of the interaction between the filler surface and the network matrix during the network rearrangement process. When non-reactive silica nanoparticles lacking significant levels of surface functional groups are used at 4 wt% (2 vol%) loading, the resulting network composite exhibits substantial enhancement in mechanical properties relative to the neat network and, based on values of rubbery plateau modulus, is able to fully recover its cross-link density after a reprocessing step...
December 26, 2018: ACS Applied Materials & Interfaces
Joselle M McCracken, Brittany M Rauzan, Jacob C E Kjellman, Mikhail E Kandel, Yu Hao Liu, Adina Badea, Lou Ann Miller, Simon A Rogers, Gabriel Popescu, Ralph G Nuzzo
Materials chemistries for hydrogel scaffolds that are capable of programming temporal (4D) attributes of cellular decision-making in supported 3D microcultures are described. The scaffolds are fabricated using direct-ink writing (DIW)-a 3D-printing technique using extrusion to pattern scaffolds at biologically relevant diameters (≤ 100 µm). Herein, DIW is exploited to variously incorporate a rheological nanoclay, Laponite XLG (LAP), into 2-hydroxyethyl methacrylate (HEMA)-based hydrogels-printing the LAP-HEMA (LH) composites as functional modifiers within otherwise unmodified 2D and 3D HEMA microstructures...
November 22, 2018: Advanced Healthcare Materials
Alireza Hosseinmardi, Pratheep Kumar Annamalai, Benoit Martine, Jordan Pennells, Darren J Martin, Nasim Amiralian
The isolation of nanocellulose from lignocellulosic biomass, with desirable surface chemistry and morphology, has gained extensive scientific attention for various applications including polymer nanocomposite reinforcement. Additionally, environmental and economic concerns have driven researchers to explore viable alternatives to current isolation approaches, employing chemicals with reduced environmental impact. To address these issues, in this study, we have tuned the amphiphilic behavior of cellulose nanofibers (CNFs) by employing controlled alkali treatment, instead of in combination with expensive, environmentally unsustainable conventional approaches...
November 30, 2018: ACS Omega
Mohammed H Al-Saleh
Nanostructured polymeric materials based on conductive nanofillers have promising applications in the energy storage field owing to the extraordinary characteristics of the nanofillers. Conductive nanofillers, such as graphene nanoplatelets, are characterized by small size, extraordinary surface area to volume ratio, high aspect-ratio and extremely low electrical resistivity. In this work, the dielectric behaviors and the corresponding energy storage capabilities of high aspect-ratio carbon nanofiller/polymer composites were reviewed...
December 7, 2018: Nanotechnology
Paul A Charpentier, Chao Chen, Koosha Azhie, Bernd Grohe, Md Abdul Mumin, Adria F Lotus, Patrick Therrien, Silvia Mittler
Visible region active photocatalytic coatings are of interest for antimicrobial activity in low light applications or those employing LED lights with limited UV content. This work examined Ag and Fe doped titania nanoparticles (nTiO2) with varying dopant ranges in polyaspartic polymer coatings for potential light and dark activity. First, the Ag and Fe doped nTiO2 were synthesized by sol-gel chemistry with varying dopant concentrations, then characterized with respect to their size and aggregate size distribution, crystallinity, and surface and band gap features...
November 30, 2018: Nanotechnology
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