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https://www.readbyqxmd.com/read/28534207/construction-of-polyarylenes-with-various-structural-features-via-bergman-cyclization-polymerization
#1
REVIEW
Youfu Wang, Shudan Chen, Aiguo Hu
Synthetic polymer chemistry is a fundamental part of polymer science, and highly efficient polymerization reactions are essential for the synthesis of high-performance polymers. Development of new synthetic methods for emerging polymer science is of great importance in this regard. Bergman cyclization is a chemical process in which highly reactive aryl diradicals form from enediyne precursors, having a strong impact in a number of fields including pharmaceutics, synthetic chemistry, and materials science. Diradical intermediates stemming from enediynes can cause DNA cleavage under physiological conditions, leading to the strong cytotoxicity of many naturally occurring enediyne antibiotics...
June 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28531816/predicted-phototoxicities-of-carbon-nano-material-by-quantum-mechanical-calculations
#2
Don Betowski
The purpose of this research was to develop a predictive model for the phototoxicity potential of carbon nanomaterials (fullerenols and single-walled carbon nanotubes). This model is based on the quantum mechanical (ab initio) calculations on these carbon-based materials and comparison of the triplet excited states of these materials to published work relating phototoxicity of polynuclear aromatic hydrocarbons (PAH) to their predictive triplet excited state energy. A successful outcome will add another tool to the arsenal of predictive methods for the U...
March 31, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28530806/photoluminescent-hybrids-of-cellulose-nanocrystals-and-carbon-quantum-dots-as-cytocompatible-probes-for-in-vitro-bio-imaging
#3
Jiaqi Guo, Dongfei Liu, Ilari Filpponen, Leena-Sisko Johansson, Jani-Markus Malho, Sakeena Quraishi, Falk Liebner, Hélder A Santos, Orlando J Rojas
We present an approach to construct biocompatible and photoluminescent hybrid materials comprised of carbon quantum dots (CQD) and TEMPO-oxidized cellulose nanocrystals (TO-CNC). First, the amino-functionalized carbon quantum dots (NH2-CQD) were synthesized using a simple microwave method and the TO-CNCs were prepared by hydrochloric acid (HCl) hydrolysis followed by TEMPO-mediated oxidation. The conjugation of NH2-CQD and TO-CNC was conducted via carbodiimide-assisted coupling chemistry. The synthesized TO-CNC@CQD hybrid nanomaterials were characterized using X-ray photoelectron spectroscopy, cryo-transmittance electron microscopy, confocal microscopy and fluorescence spectroscopy...
May 22, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28530092/fibroblast-cytophilic-and-hela-cytotoxic-dual-function-carbon-nanoribbon-network-platform
#4
A K M Rezaul Haque Chowdhury, Bo Tan, Krishnan Venkatakrishnan
Carbon nanomaterials have emerged as a promising material in cancer diagnosis and therapy. Carbon nanomaterials/nanostructures (C-C molecular structure) act as a carrier/skeleton and require further surface modification through functionalization with chemicals or biomolecules to attain a cell response. We report the synthesis of a novel carbon nanoribbon network (CNRN) platform that possesses a combination of C-C and C-O bond architecture. The bioactive CNRN showed enhanced ability for cell adhesion. Most importantly, it induced opposite cell responses from healthy cells and cancerous cells, cytophilic to fibroblasts but cytotoxic to HeLa cells...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28528626/colloid-particle-formulations-for-antimicrobial-applications
#5
REVIEW
Ahmed F Halbus, Tommy S Horozov, Vesselin N Paunov
Colloidal particles are being extensively studied in various antimicrobial applications due to their small size to volume ratio and ability to exhibit a wide spectrum of antibacterial, antifungal, antialgal and antiviral action. The present review focuses on various nanoparticles (NPs) of inorganic, organic and hybrid materials, and discusses some of the methods for their preparation as well as mechanisms of their antimicrobial action. We consider the antimicrobial applications of metal oxide nanoparticles (ZnO, MgO, CuO, Cu2O, Al2O3, TiO2, CeO2 and Y2O3), metal nanoparticles (NPs), such as copper, silver and gold, metal hydroxide NPs such as Mg(OH)2 as well as hybrid NPs made from biodegradable materials, such as chitosan, lignin and dextran, loaded with other antimicrobial agents...
May 12, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28524663/polydopamine-generates-hydroxyl-free-radicals-under-uv-light-illumination
#6
Zehuan Wang, Feng Tang, Hailong Fan, Le Wang, Zhaoxia Jin
Polydopamine generally demonstrates as efficient free-radical scavenger. However, its free radical chemistry under illumination is unclear, which becomes important in view of growing studies of polydopamine applications in photoprotector and photothermal therapy. In this study, for the first time, we reported an experimental investigation of the generation of hydroxyl free-radicals from UV-illuminated polydopamine in aqueous environment. By using terephthalic acid as fluorescent probe, we have measured hydroxyl radicals generated from UV-illuminated polydopamine with different shapes and sizes...
May 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28523917/silica-nanoparticles-functionalized-with-zwitterionic-sulfobetaine-siloxane-for-application-as-a-versatile-antifouling-coating-system
#7
Brianna Rose Knowles, Pawel Wagner, Shane MacLaughlin, Michael J Higgins, Paul J Molino
The growing need to develop surfaces able to effectively resist biological fouling has resulted in the widespread investigation of nanomaterials with potential antifouling properties. However, the preparation of effective antifouling coatings is limited by the availability of reactive surface functional groups and our ability to carefully control and organise chemistries at a materials interface. Here, we present two methods of preparing hydrophilic low fouling surface coatings through reaction of silica nanoparticle suspensions and pre-deposited silica nanoparticle films with zwitterionic sulfobetaine...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28508053/backside-absorbing-layer-microscopy-watching-graphene-chemistry
#8
Stéphane Campidelli, Refahi Abou Khachfe, Kevin Jaouen, Jean Monteiller, Claude Amra, Myriam Zerrad, Renaud Cornut, Vincent Derycke, Dominique Ausserré
The rapid rise of two-dimensional nanomaterials implies the development of new versatile, high-resolution visualization and placement techniques. For example, a single graphene layer becomes observable on Si/SiO2 substrates by reflected light under optical microscopy because of interference effects when the thickness of silicon oxide is optimized. However, differentiating monolayers from bilayers remains challenging, and advanced techniques, such as Raman mapping, atomic force microscopy (AFM), or scanning electron microscopy (SEM) are more suitable to observe graphene monolayers...
May 2017: Science Advances
https://www.readbyqxmd.com/read/28507702/plasmon-induced-charge-separation-chemistry-and-wide-applications
#9
Tetsu Tatsuma, Hiroyasu Nishi, Takuya Ishida
Recent development of nanoplasmonics has stimulated chemists to utilize plasmonic nanomaterials for efficient and distinctive photochemical applications, and physicists to boldly go inside the "wet" chemistry world. The discovery of plasmon-induced charge separation (PICS) has even accelerated these trends. On the other hand, some confusion is found in discussions about PICS. In this perspective, we focus on differences between PICS and some other phenomena such as co-catalysis effect and plasmonic nanoantenna effect...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28499770/development-of-active-nanoparticle-antimicrobial-technologies-for-muscle-based-packaging-applications
#10
REVIEW
Michael A Morris, Sibu C Padmanabhan, Malco C Cruz-Romero, Enda Cummins, Joseph P Kerry
Fresh and processed muscle-based foods are highly perishable food products and packaging plays a crucial role in providing containment so that the full effect of preservation can be achieved through the provision of shelf-life extension. Conventional packaging materials and systems have served the industry well, however, greater demands are being placed upon industrial packaging formats owing to the movement of muscle-based products to increasingly distant markets, as well as increased customer demands for longer product shelf-life and storage capability...
April 28, 2017: Meat Science
https://www.readbyqxmd.com/read/28497680/guanidinium-based-polymerizable-surfactant-as-a-multifunctional-molecule-for-controlled-synthesis-of-nanostructured-materials-with-tunable-morphologies
#11
Jingwei Ji, Wei Zhu, Jian Li, Peng Wang, Yun Liang, Wanlin Zhang, Xianpeng Yin, Baozhen Wu, Guangtao Li
Rationally and efficiently controlling the morphology of nanomaterials plays a crucial role in significantly enhancing their functional properties and expending their applications. In this work, a strategy for controlled synthesis of diverse nanostructured materials with tunable morphologies was developed using a guanidinium-based surfactant with a polymerizable pyrrole unit as a multifunctional molecule that can serve not only as a structure-directing agent for mesostucture formation but also as a monomer and carbon source...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28496984/functional-conductive-nanomaterials-via-polymerisation-in-nano-channels-pedot-in-a-mof
#12
Tiesheng Wang, Meisam Farajollahi, Sebastian Henke, Tongtong Zhu, Sneha R Bajpe, Shijing Sun, Jonathan S Barnard, June Sang Lee, John D W Madden, Anthony K Cheetham, Stoyan K Smoukov
Reactions inside the pores of metal-organic frameworks (MOFs) offer potential for controlling polymer structures with regularity to sub-nanometre scales. We report a wet-chemistry route to poly-3,4-ethylenedioxythiophene (PEDOT)-MOF composites. After a two-step removal of the MOF template we obtain unique and stable macroscale structures of this conductive polymer with some nanoscale regularity.
January 1, 2017: Materials Horizons
https://www.readbyqxmd.com/read/28488712/probing-the-interactions-of-organic-molecules-nanomaterials-and-microbes-with-solid-surfaces-using-quartz-crystal-microbalances-methodology-advantages-and-limitations
#13
REVIEW
Rixiang Huang, Peng Yi, Yuanzhi Tang
Quartz crystal microbalances (QCMs) provide a new analytical opportunity and prospect to characterize many environmental processes at solid/liquid interfaces, thanks to their almost real-time measurement of physicochemical changes on their quartz sensor. This work reviews the applications of QCMs in probing the interactions of organic molecules, nanomaterials (NMs) and microbes with solid surfaces. These interfacial interactions are relevant to critical environmental processes such as biofilm formation, fate and transport of NMs, fouling in engineering systems and antifouling practices...
May 10, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28485894/an-orbital-overlap-complement-to-atomic-partial-charge
#14
Arshad Mehmood, Benjamin G Janesko
Atomic partial charges are widely used to predict reactivity. Partial charge alone is often insufficient: the carbons of benzene and cyclobutadiene, or those of diamond, graphene, and C60 , possess nearly identical partial charges and very different reactivities. Our atomic overlap distance complements computed partial charges by measuring the size of orbital lobes that best overlap with the wavefunction around an atom. Compact, chemically stable atoms tend to have overlap distances smaller than chemically soft, unstable atoms...
May 9, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28471162/enhanced-thermal-conductivity-of-copper-nanofluids-the-effect-of-filler-geometry
#15
Sushrut Bhanushali, Naveen N Jason, Prakash Chandra Ghosh, Anuradda Ganesh, George P Simon, Wenlong Cheng
Nanofluids are colloidal dispersions that exhibit enhanced thermal conductivity at low filler loadings and thus have been proposed for heat transfer applications. Here, we systematically investigate how particle shape determines the thermal conductivity of low-cost copper nanofluids using a range of distinct filler particle shapes: nanospheres, nanocubes, short nanowires, and long nanowires. To exclude the potential effects of surface capping ligands, all the filler particles are kept with uniform surface chemistry...
May 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28470243/bottom-up-engineering-of-thermoelectric-nanomaterials-and-devices-from-solution-processed-nanoparticle-building-blocks
#16
Silvia Ortega, Maria Ibáñez, Yu Liu, Yu Zhang, Maksym V Kovalenko, Doris Cadavid, Andreu Cabot
The conversion of thermal energy to electricity and vice versa by means of solid state thermoelectric devices is extremely appealing. However, its cost-effectiveness is seriously hampered by the relatively high production cost and low efficiency of current thermoelectric materials and devices. To overcome present challenges and enable a successful deployment of thermoelectric systems in their wide application range, materials with significantly improved performance need to be developed. Nanostructuration can help in several ways to reach the very particular group of properties required to achieve high thermoelectric performances...
May 4, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28466958/monocrystalline-nanopatterns-made-by-nanocube-assembly-and-epitaxy
#17
Beniamino Sciacca, Annemarie Berkhout, Benjamin J M Brenny, Sebastian Z Oener, Marijn A van Huis, Albert Polman, Erik C Garnett
Monocrystalline materials are essential for optoelectronic devices such as solar cells, LEDs, lasers, and transistors to reach the highest performance. Advances in synthetic chemistry now allow for high quality monocrystalline nanomaterials to be grown at low temperature in solution for many materials; however, the realization of extended structures with control over the final 3D geometry still remains elusive. Here, a new paradigm is presented, which relies on epitaxy between monocrystalline nanocube building blocks...
May 3, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28463480/an-open-pit-nanofluidic-tool-localized-chemistry-assisted-by-mesoporous-thin-film-infiltration
#18
Magalí Mercuri, Karina A Pierpauli, Claudio L A Berli, Martín G Bellino
Nanofluidics based on nanoscopic porous structures has emerged as the next evolutionary milestone in the construction of versatile nanodevices with unprecedented applications. However, the straightforward development of nanofluidically interconnected systems is crucial for the production of practical devices. Here, we demonstrate that spontaneous infiltration into supramolecularly templated mesoporous oxide films at the edge of a sessile drop in open air can be used to connect pairs of landmarks. The liquids from the drops can then join through the nanoporous network to guide a localized chemical reaction at the nanofluid-front interface...
May 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28460527/formation-of-dendrimer-nanoassemblies-by-oligomerization-induced-liquid-liquid-phase-separation
#19
Viviana C P da Costa, Onofrio Annunziata
Dendrimers are hyperbranched macromolecules with applications in host-guest chemistry, self-assembly, nanocatalysis, and nanomedicine. We show that dendrimer-based globular nanoparticles are formed by using dendrimer oligomerization to isothermally induce liquid-liquid phase separation (LLPS). We first determined that LLPS of aqueous mixtures of the fourth-generation amino-functionalized poly(amido amine) dendrimer is observed by lowering temperature in the presence of sodium sulfate. In relation to LLPS, we experimentally characterized the effect of salt and dendrimer concentrations on the LLPS temperature and salt-dendrimer isothermal partitioning...
May 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28458540/surface-ligand-controls-silver-ion-release-of-nanosilver-and-its-antibacterial-activity-against-escherichia-coli
#20
Yan-Min Long, Li-Gang Hu, Xue-Ting Yan, Xing-Chen Zhao, Qun-Fang Zhou, Yong Cai, Gui-Bin Jiang
Understanding the mechanism of nanosilver-dependent antibacterial activity against microorganisms helps optimize the design and usage of the related nanomaterials. In this study, we prepared four kinds of 10 nm-sized silver nanoparticles (AgNPs) with dictated surface chemistry by capping different ligands, including citrate, mercaptopropionic acid, mercaptohexanoic acid, and mercaptopropionic sulfonic acid. Their surface-dependent chemistry and antibacterial activities were investigated. Owing to the weak bond to surface Ag, short carbon chain, and low silver ion attraction, citrate-coated AgNPs caused the highest silver ion release and the strongest antibacterial activity against Escherichia coli, when compared to the other tested AgNPs...
2017: International Journal of Nanomedicine
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