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https://www.readbyqxmd.com/read/30103430/enhanced-antibacterial-activity-of-silver-doped-titanium-dioxide-chitosan-composites-under-visible-light
#1
Jie Li, Bing Xie, Kai Xia, Yingchun Li, Jing Han, Chunmao Zhao
Nano titanium dioxide (TiO₂) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO₂-chitosan (STC) and TiO₂-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO₂ nanoparticles on the cross-linked chitosan microsphere...
August 10, 2018: Materials
https://www.readbyqxmd.com/read/30092529/one-pot-synthesis-of-catalytic-molybdenum-based-nanocomposite-nano-fiber-membranes-for-aerosol-air-remediation
#2
Riyadh Al-Attabi, Yosry Morsi, Jürg A Schütz, Ludovic F Dumée
The development of fibrous air filters exhibiting high air filtration efficiency, low energy consumption, and self-cleaning properties is a critical challenge to generate the next generation of resilient air filtration systems. Nano-fibrous mats typically exhibit higher particle capture efficiency but may also lead to higher airflow resistance compared to macro-fibrous materials due to their tighter structure. In this paper, novel catalytic membranes mats were fabricated through a one-pot synthesis from ammonium tetrathiomolybdate (ATTM) doped poly(acrylonitrile) (PAN) nanofibers for sub-micron diameter aerosol particle removal...
August 4, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30088905/magnetic-biohybrid-vesicles-transported-by-an-internal-propulsion-mechanism
#3
Ana Mateos-Maroto, Andrés Guerrero-Martínez, Ramon Gonzalez Rubio, Francisco Ortega, Fernando Martinez-Pedrero
Some biological microorganisms can crawl or swim due to coordinated motions of their cytoskeleton or the flagella located inside their bodies, which push the cells forward through intracellular forces. To date, there is no demonstration of a biomimetic self-propelled swimmer operating at a low Reynolds number due to internal movements within an enclosing membrane. Here, we report lipid vesicles and other more complex self-assembled biohybrid structures able to propel due to the advection flows generated by the actuated rotation of the superparamagnetic particles they contain...
August 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30074045/polystyrene-heterojunction-semiconductor-composite-spheres-prepared-by-a-hydrothermal-synthesis-process-a-recyclable-photocatalyst-under-visible-light-irradiation-for-removing-organic-dyes-from-aqueous-solution
#4
Xiaofei Guo, Chuanxiang Qin, Mingyue Zhu, Jian-Jun Wang, Jun Sun, Lixing Dai
A composite photocatalyst, with a BiOI/TiO2 heterojunction supported on carboxyl polystyrene spheres, was prepared using a two step hydrothermal reaction method. The products were characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The results show that the polystyrene microspheres were covered with smaller-sized BiOI microspheres, while nano-sized TiO2 particles were deposited on the surface of the flower-like BiOI microspheres. As an internal electric field exists when BiOI is hybridized with TiO2, the photogenerated carriers could be separated effectively and the resulting composite photocatalyst PS/BiOI/TiO2 had better performance for degrading rhodamine B in aqueous solution under visible-light irradiation with a 40 W incandescent lamp than that of PS/BiOI...
August 3, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/30062879/hydrothermal-one-step-synthesis-of-highly-dispersed-m-phase-vo-2-nanocrystals-and-application-to-flexible-thermochromic-film
#5
Deyu Guo, Chen Ling, Chengzhi Wang, Dan Wang, JingBo Li, Zhengjing Zhao, Zehao Wang, Yongjie Zhao, Jiatao Zhang, Haibo Jin
Preparation of ultrafine highly-dispersed VO2 (M) nanoparticles which are essential materials to fabricate thermochromic flexible films remains a challenge preventing effective use of their promising properties. Here, we report an original hydrothermal approach by controlling oxidizing atmosphere of reaction with hydrogen peroxide to prepare ultrafine VO2 (M) nanoparticles free from annealing. Hydrogen peroxide is separated from precursor solution in reactor which creates a moderate oxygenation environment, enabling the formation of stoichiometric VO2 (M) nanoparticles...
July 31, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30047575/flexible-metal-organic-framework-based-mixed-matrix-membranes-a-new-platform-for-h-2-s-sensors
#6
Xin Zhang, Qi Zhang, Dan Yue, Jun Zhang, Jintong Wang, Bin Li, Yu Yang, Yuanjing Cui, Guodong Qian
Metal-organic framework (MOF)-polymer mixed-matrix membranes (MMMs) have shown great potential and superior performance in gas separations. However, their sensing application has not been fully established yet. Herein, a rare example of using flexible MOF-based MMMs as a fluorescent turn-on sensor for the detection of hydrogen sulfide (H2 S) is reported. These MOF-based MMMs are readily prepared by mixing a highly stable aluminum-based nano-MOF (Al-MIL-53-NO2 ) into poly(vinylidene fluoride) with high loadings up to 70%...
July 26, 2018: Small
https://www.readbyqxmd.com/read/30029442/nano-sized-anion-exchangers-as-a-stationary-phase-in-capillary-electrochromatography-for-separation-and-on-line-concentration-of-carboxylic-acids
#7
Daria Polikarpova, Daria Makeeva, Liudmila Kartsova, Anatoly Dolgonosov, Nadezhda Kolotilina
Nano-sized anion-exchangers (NSAE) are promising materials in electrophoretic separation methods due to their high ion-exchange capacity, large surface-to-volume ratios, high adhesion to the quartz surface and pH-independent positive charge. In current research we describe a simple approach for NSAE synthesis, which includes two-step grinding of macroanionite followed by centrifugation. The synthesized stable aqueous suspension of NSAE particles was applied as physically adsorbed modifier of fused-silica capillary walls for CEC separation of carboxylic acids...
October 1, 2018: Talanta
https://www.readbyqxmd.com/read/30016297/enhanced-photocatalytic-degradation-of-doxycycline-using-a-magnetic-polymer-zno-composite
#8
Ali Mohammadi, Shabnam Pourmoslemi
A novel magnetic polymer-ZnO composite was prepared by incorporating Fe3 O4 and ZnO nano-particles in the structure of an adsorbent polymer. Precipitation polymerization was used for synthesizing the adsorbent polymer and its efficiency for extracting doxycycline from aqueous solution was optimized according to several parameters including time, pH and amount of polymer. Results showed the highest extraction efficiency at neutral pH of the doxycycline solution in 20 min, and the capacity of the polymer was about 20 mg/g...
July 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30004216/fe-3-o-4-decorated-porous-graphene-interlayer-for-high-performance-lithium-sulfur-batteries
#9
Yuanming Liu, Xianying Qin, Shaoqiong Zhang, Gemeng Liang, Feiyu Kang, Guohua Chen, Baohua Li
Lithium-sulfur (Li-S) batteries are seriously restrained by the shuttling effect of intermediary products and their further reduction on the anode surface. Considerable researches have been devoted to overcoming these issues by introducing carbon-based materials as the sulfur host or interlayer in the Li-S systems. Herein, we constructed a multifunctional interlayer on a separator by inserting Fe3 O4 nanoparticles (NPs) in a porous graphene (PG) film to immobilize polysulfides effectively. The porous structure of graphene was optimized by controlling the oxidation conditions for facilitating ion transfer...
July 26, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29998246/conformational-change-and-suppression-of-the-%C3%AE-temperature-for-solutions-of-polymer-grafted-nanoparticles
#10
Katrina Irene S Mongcopa, Ryan Poling-Skutvik, Rana Ashkar, Paul Butler, Ramanan Krishnamoorti
We determine the conformational change of polystyrene chains grafted to silica nanoparticles dispersed in deuterated cyclohexane using small-angle neutron scattering. The cyclohexane/polystyrene system exhibits an upper-critical solution temperature below which the system phase separates. By grafting the polystyrene chains to a nano-sized spherical silica particle, we observe a significant suppression in the Θ-temperature, decreasing from ≈38 °C for free polystyrene chains in d12-cyclohexane to ≈34 °C for the polystyrene-grafted nanoparticles...
July 25, 2018: Soft Matter
https://www.readbyqxmd.com/read/29993108/solvothermal-synthesis-of-zno-nitrogen-doped-graphene-composite-and-its-application-as-catalyst-for-photodegradation-of-organic-dye-methylene-blue
#11
Rajinder Singh, Manesh Kumar, Heena Khajuria, Jigmet Ladol, Haq Nawaz Sheikh
A facile one step solvothermal method is designed for the synthesis of visible light-sensitive ZnO-nitrogen doped graphene (ZNG) nano photocatalysts using ethylene glycol as a solvent as well as an agent to prevent aggregation of graphene layers. The deposition of ZnO nanoparticles onto the NG layers was confirmed by high resolution transmission electron microscope (HR-TEM), scanning electron microscope (SEM), powder X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). UV-Vis spectroscopy (UV-Vis) was used to study the enhanced photocatalytic activity, which shows the red-shift of the band-edge as compared to ZnO nano particles...
June 2018: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/29962102/magnetophoretic-sorting-of-single-catalyst-particles
#12
Miguel Solsona, Anne-Eva Nieuwelink, Florian Meirer, Leon Abelmann, Mathieu Odijk, Wouter Olthuis, Bert M Weckhuysen, Albert van den Berg
A better understanding of the deactivation processes taking place within solid catalysts is vital to design better ones. However, since inter-particle heterogeneities are more a rule than an exception, particle sorting is crucial to analyse single catalyst particles in detail. Microfluidics offers new possibilities to sort catalysts at the single particle level. Herein, we report a first-of-its-kind 3D printed magnetophoretic chip able to sort catalyst particles by their magnetic moment. Fluid catalytic cracking (FCC) particles were separated based on their Fe content...
July 1, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29809016/self-assembled-magnetic-viruslike-particles-for-encapsulation-and-delivery-of-deoxyribonucleic-acid
#13
Wenrong Zhao, Hong Sun, Yitong Wang, Julian Eastoe, Shuli Dong, Jingcheng Hao
Developing nontoxic artificial carriers for stimuli-responsive capture, transport, and delivery of biomolecules is of immense scientific interest. Herein, for the first time, we synthesize a double-tailed cationic surfactant, (C16 H33 )2 (CH3 )2 N+ [FeCl3 Br]- , which possesses magnetic properties [magnetic surfactants (Mag-Surfs)]. The time-dependent formation of virus-shaped hybrid mixed assemblies of polyoxometalates (POMs) {Mo72 Fe30 }/Mag-Surf with hollow-shell structures is followed. These structures serve well as robust high-surface-area shuttles, which can be manipulated with applied magnetic fields...
June 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29799661/synthesis-of-zif-93-11-hybrid-nanoparticles-via-post-synthetic-modification-of-zif-93-and-their-use-for-h-2-co-2-separation
#14
Javier Sánchez-Laínez, Beatriz Zornoza, Angelica F Orsi, Magdalena M Łozińska, Daniel M Dawson, Sharon E Ashbrook, Stephen M Francis, Paul A Wright, Virginie Benoit, Philip L Llewellyn, Carlos Téllez, Joaquín Coronas
The present work shows the synthesis of nano-sized hybrid zeolitic imidazolate frameworks (ZIFs) with the rho topology based on a mixture of the linkers benzimidazole (bIm) and 4-methyl-5-imidazolecarboxaldehyde (4-m-5-ica). The hybrid ZIF was obtained by post-synthetic modification of ZIF-93 in a bIm solution. The use of different solvents, MeOH and N,N-dimethylacetamide (DMAc), and reaction times led to differences in the quantity of bIm incorporated to the framework, from 7.4 to 23 % according to solution-state NMR spectroscopy...
May 25, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29788211/particle-concentrations-in-occupational-settings-measured-with-a-nanoparticle-respiratory-deposition-nrd-sampler
#15
Larissa V Stebounova, Natalia I Gonzalez-Pech, Jae Hong Park, T Renee Anthony, Vicki H Grassian, Thomas M Peters
There is an increasing need to evaluate concentrations of nanoparticles in occupational settings due to their potential negative health effects. The Nanoparticle Respiratory Deposition (NRD) personal sampler was developed to collect nanoparticles separately from larger particles in the breathing zone of workers, while simultaneously providing a measure of respirable mass concentration. This study compared concentrations measured with the NRD sampler to those measured with a nano Micro Orifice Uniform-Deposit Impactor (nanoMOUDI) and respirable samplers in three workplaces...
July 6, 2018: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29783648/stability-of-go-modified-by-different-dispersants-in-cement-paste-and-its-related-mechanism
#16
Wu-Jian Long, Changle Fang, Jingjie Wei, Haodao Li
Graphene oxide (GO) is a potential material to be used as a nano-reinforcement in cement matrix. However, a prerequisite for GO to fulfill its function in the cement matrix is homogeneous dispersion. In this study, the effects of three different dispersing agents (DAs), including polycarboxylate-based high range water reducer (P-HRWR), naphthalene-based high range water reducer (N-HRWR), and air entraining agent (AEA) on the dispersion of GO in aqueous solution, simulated concrete pore solution (SCPS), and suspension of cement pastes were sequentially investigated...
May 18, 2018: Materials
https://www.readbyqxmd.com/read/29753974/occurrence-characterisation-and-fate-of-nano-particulate-ti-and-ag-in-two-norwegian-wastewater-treatment-plants
#17
Fabio Polesel, Julia Farkas, Marianne Kjos, Patricia Almeida Carvalho, Xavier Flores-Alsina, Krist V Gernaey, Steffen Foss Hansen, Benedek Gy Plósz, Andy M Booth
Due to their widespread application in consumer products, elemental titanium (e.g., titanium dioxide, TiO2 ) and silver (Ag), also in nanoparticulate form, are increasingly released from households and industrial facilities to urban wastewater treatment plants (WWTPs). A seven-day sampling campaign was conducted in two full-scale WWTPs in Trondheim (Norway) employing only primary treatment. We assessed the occurrence and elimination of Ti and Ag, and conducted size-based fractionation using sequential filtration of influent samples to separate particulate, colloidal and dissolved fractions...
September 15, 2018: Water Research
https://www.readbyqxmd.com/read/29751726/waste-carton-derived-nanocomposites-for-efficient-removal-of-hexavalent-chromium
#18
Jie Han, Guilong Zhang, Linglin Zhou, Furu Zhan, Dongqing Cai, Zhengyan Wu
A new nanocomposite (SCZ), microspherical carbon (SC) loaded with nanoscale zerovalent iron (ZVI), was fabricated to efficiently remove hexavalent chromium (Cr(VI)) in water. Therein, SC was derived from waste carton through hydrothermal treatment after pretreatment of removing hemicellulose and lignin, and the optimal hydrothermal conditions (200 °C, hydrothermal time of 12 h) for the preparation of SC were obtained. Subsequently, SC could effectively load ZVI nanoparticles which displayed high dispersion on the surface of SC and in the pores among SC particles owing to steric hindrance effect...
May 29, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29751048/predicting-emp-hazard-lessons-from-studies-with-inhaled-fibrous-and-non-fibrous-nano-and-micro-particles
#19
Günter Oberdörster, Uschi Graham
Inhalation exposure to elongated cleavage fragments occurring at mineral and rock mining and crushing operations raises important questions regarding potential health effects given their resemblance to fibers with known adverse health effects like amphibole asbestos. Thus, a major goal for establishing a toxicity profile for elongate mineral particles (EMPs) is to identify and characterize a suspected hazard and characterize a risk by examining together results of hazard and exposure assessment. This will require not only knowledge about biokinetics of inhaled EMPs but also about underlying mechanisms of effects induced by retained EMPs...
May 8, 2018: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29723467/facile-preparation-of-ag-coated-superhydrophobic-superoleophilic-mesh-for-efficient-oil-water-separation-with-excellent-corrosion-resistance
#20
Zhiping Du, Peng Ding, Xiumei Tai, Zihe Pan, Hengquan Yang
We present the facile preparation of a superhydrophobic-oleophilic stainless steel mesh with excellent oil/water separation efficiency and resistance to corrosion through hydrofluoric (HF) acid etching, Ag nanoparticle coating, and stearic acid modification, to construct a superhydrophobic micro/nanohierarchical structure. The surface of the treated mesh exhibits superhydrophobicity, with a water contact angle of 152°, and superoleophilicity, with an oil contact angle of 0°. The effects of variation in the HF etching time and Ag nanoparticle coating on surface wettability were explored...
June 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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