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https://www.readbyqxmd.com/read/28918292/nanoscaled-gold-and-silver-simultaneous-removal-and-transformation-to-functional-materials
#1
Youyi Xia, Lin Sun, Hongping Xiao
Based on an "acid-assisted cool welding" technology which was realized by virtue of the freezing process in the presence of acid, nanoscaled gold (Au) and silver (Ag) from wastewater could be removed very facilely and efficiently. The technology was independence of the freezing temperature, size as well as shape of those nanoscaled units. Besides, some functional materials like porous nanostructures with highly and stably catalytic activity could be also obtained during the removal. Our research not only provided a new method to remove nanoscaled Ag or Au from wastewater, but also built up a unique route to transform those nano-units into functional materials simultaneously...
September 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28918227/bone-remodeling-of-the-distal-femur-after-uncemented-total-knee-arthroplasty-a-2-year-prospective-dxa-study
#2
Mikkel Rathsach Andersen, Nikolaj S Winther, Thomas Lind, Henrik M Schrøder, Michael Mørk Petersen
Loss of bone stock as a response to the bone trauma, immobilization, and stress shielding related to joint replacement surgery increases the risk of fracture of the distal femur after total knee arthroplasty. Previous studies of uncemented femoral components have reported very high levels of bone loss in the distal femur. This study investigates the adaptive bone remodeling of the distal femur after uncemented total knee arthroplasty. We performed a 2-year follow-up of 53 patients (mean age 61.5 [38-70] years, F/M = 27/26, body mass index 29...
September 13, 2017: Journal of Clinical Densitometry
https://www.readbyqxmd.com/read/28917965/the-development-of-a-butyrylcholinesterase-porous-pellet-for-innovative-detection-of-cholinesterase-inhibitors
#3
Jiří Zeman, David Vetchý, Aleš Franc, Sylvie Pavloková, Vladimír Pitschmann, Lukáš Matějovský
The aim of the presented research was the preparation of an innovative carrier with significantly improved properties for the fast and sensitive detection of cholinesterase inhibitors such as nerve agents. This innovative carrier was in the form of spherical pellets containing different amounts of Neusilin. Neusilin is a synthetic and amorphous form of magnesium aluminometasilicate with a high specific surface area, and the immobilized enzyme butyrylcholinesterase with an activity of 50nkat·g(-1). Pellets were prepared by the extrusion-spheronization method and dried in a hot air oven under two conditions - at 30°C for 72h and at 60°C for 24h...
September 13, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28917918/chitosan-composite-hydrogels-reinforced-with-natural-clay-nanotubes
#4
Biao Huang, Mingxian Liu, Changren Zhou
Here, chitosan composites hydrogels were prepared by addition of halloysite nanotubes (HNTs) in the chitosan KOH/LiOH/urea solution. The raw chitosan and chitosan/HNTs composite hydrogels were obtained by heat treatment at 60°C for 8h and then regeneration in ethanol solution. The viscosity of the composite solution is increased with HNTs content. The Fourier transform infrared spectroscopy (FT-IR) shows that the hydrogen bonds interactions exist between the HNTs and the chitosan. X-ray diffraction (XRD) results show that the crystal structure of HNT is not changed in the composite hydrogels...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917911/injectable-glycosaminoglycan-protein-nano-complex-in-semi-interpenetrating-networks-a-biphasic-hydrogel-for-hyaline-cartilage-regeneration
#5
Janani Radhakrishnan, Anuradha Subramanian, Swaminathan Sethuraman
Articular hyaline cartilage regeneration remains challenging due to its less intrinsic reparability. The study develops injectable biphasic semi-interpenetrating polymer networks (SIPN) hydrogel impregnated with chondroitin sulfate (ChS) nanoparticles for functional cartilage restoration. ChS loaded zein nanoparticles (∼150nm) prepared by polyelectrolyte-protein complexation were interspersed into injectable SIPNs developed by blending alginate with poly(vinyl alcohol) and calcium crosslinking. The hydrogel exhibited interconnected porous microstructure (39...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917850/porous-composite-membranes-based-on-cellulose-acetate-and-cellulose-nanocrystals-via-electrospinning-and-electrospraying
#6
Santhosh S Nair, Aji P Mathew
Porous and non-porous cellulose acetate (CA) - cellulose nanocrystal (CNC) electrospun nanocomposite fibers and electrosprayed-electrospun composite membranes were fabricated using two different binary solvent systems. To evaluate the expression of CNC as the active entity in the membrane, dye adsorption studies were carried out using Victoria Blue. To overcome the low surface area of thick porous fibers, a porous electrosprayed-electrospun composite has developed which exhibited 98% dye removal compared to non-porous counterparts (67...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917846/an-efficient-chitosan-derived-carbon-silica-microspheres-supported-pd-catalyst-with-high-stability-for-heck-reactions
#7
Yechao Su, Luyao Ma, Jian Chen, Jianhong Xu
To maintain stability and activity in Heck-coupling reaction, a novel composite carrier with controllable uniform size, high complex ability and mechanical intensity was fabricated in microchannel using natural N-doped biomolecule chitosan and silica as ingredients. Post carbonization increased its thermal stability and supported Pd@C/silica catalysts can be acquired after Pd loading. Only 2mg supported Pd@C/silica catalysts (0.44μmol) can achieve high yield (>95%) in a typical Heck-coupling reaction and maintained activity even after 8 times of recycling...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917788/glass-polytetrafluoroethylene-glass-based-sandwich-microdevice-for-continuous-flow-polymerase-chain-reaction-and-its-application-for-fast-identification-of-foodborne-pathogens
#8
Kieu The Loan Trinh, Nae Yoon Lee
A uniquely fabricated microdevice with a glass-polytetrafluoroethylene (PTFE)-glass (GPG) sandwich configuration was developed for the fast identification of foodborne pathogens by using continuous-flow polymerase chain reaction (PCR) followed by on-site fluorescence detection of PCR products. A PTFE tube was simply folded into a serpentine configuration and sandwiched between two glass slides to maintain a 2D planar structure. By using a PTFE tube, the microchannel has the advantage of seamlessness without the need for photolithography methods, and is less expensive and less time-consuming to fabricate than alternative devices...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917579/microcirculation-in-the-murine-liver-a-computational-fluid-dynamic-model-based-on-3d-reconstruction-from-in-vivo-microscopy
#9
Monica Piergiovanni, Elena Bianchi, Giada Capitani, Irene Li Piani, Lucia Ganzer, Luca G Guidotti, Matteo Iannacone, Gabriele Dubini
The liver is organized in hexagonal functional units - termed lobules - characterized by a rather peculiar blood microcirculation, due to the presence of a tangled network of capillaries - termed sinusoids. A better understanding of the hemodynamics that governs liver microcirculation is relevant to clinical and biological studies aimed at improving our management of liver diseases and transplantation. Herein, we built a CFD model of a 3D sinusoidal network, based on in vivo images of a physiological mouse liver obtained with a 2-photon microscope...
September 2, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28917152/pegylated-thermosensitive-lipid-coated-hollow-gold-nanoshells-for-effective-combinational-chemo-photothermal-therapy-of-pancreatic-cancer
#10
Bijay Kumar Poudel, Biki Gupta, Thiruganesh Ramasamy, Raj Kumar Thapa, Shiva Pathak, Kyung Taek Oh, Jee-Heon Jeong, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
Pancreatic cancer has extremely poor prognosis with an 85% mortality rate that results from aggressive and asymptomatic growth, high metastatic potential, and rapid development of resistance to already ineffective chemotherapy. In this study, plasmonic hollow gold nanoshells (GNS) coated with PEGylated thermosensitive lipids were prepared as an efficient platform to ratiometrically co-deliver two drugs, bortezomib and gemcitabine (GNS-L/GB), for combinational chemotherapy and photothermal therapy of pancreatic cancer...
September 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28915939/porous-organic-polymers-with-different-pore-structures-for-sensitive-solid-phase-microextraction-of-environmental-organic-pollutants
#11
Zhoubing Huang, Shuqin Liu, Jianqiao Xu, Li Yin, Juan Zheng, Ningbo Zhou, Gangfeng Ouyang
Adsorption capacity is the major sensitivity-limited factor in solid-phase microextraction. Due to its light-weight properties, large specific surface area and high porosity, especially tunable pore structures, the utilization of porous organic polymers as solid-phase microextraction adsorbents has attracting researchers' attentions. However, these works mostly concentrated on the utilization of specific porous organic polymers for preparing high-performance solid-phase microextraction coatings. The relationship between pore structures and adsorption performance of the porous organic polymers still remain unclear...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915736/communication-a-method-to-compute-the-transport-coefficient-of-pure-fluids-diffusing-through-planar-interfaces-from-equilibrium-molecular-dynamics-simulations
#12
Romain Vermorel, Fouad Oulebsir, Guillaume Galliero
The computation of diffusion coefficients in molecular systems ranks among the most useful applications of equilibrium molecular dynamics simulations. However, when dealing with the problem of fluid diffusion through vanishingly thin interfaces, classical techniques are not applicable. This is because the volume of space in which molecules diffuse is ill-defined. In such conditions, non-equilibrium techniques allow for the computation of transport coefficients per unit interface width, but their weak point lies in their inability to isolate the contribution of the different physical mechanisms prone to impact the flux of permeating molecules...
September 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28915482/nickel-nanoparticles-encapsulated-in-porous-carbon-and-carbon-nanotube-hybrids-from-bimetallic-metal-organic-frameworks-for-highly-efficient-adsorption-of-dyes
#13
Lina Jin, Xiaoshuang Zhao, Xinye Qian, Mingdong Dong
Nickel nanoparticles encapsulated in porous carbon/carbon nanotube hybrids (Ni/PC-CNT) were successfully prepared by a facile carbonization process using Ni/Zn-MOF as the precursor. Distinct from previous studies, Ni/Zn-MOF precursors were prepared via a direct precipitation method at room temperature for only 5min. After the carbonization, magnetic Ni nanoparticles were well embedded in the porous carbon and carbon nanotube. The obtained Ni/PC-CNT composites had a high surface area (999m(2) g(-1)), large pore volume (0...
September 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915454/assessing-the-potential-contributions-of-additional-retention-processes-to-pfas-retardation-in-the-subsurface
#14
Mark L Brusseau
A comprehensive understanding of the transport and fate of per- and poly-fluoroalkyl substances (PFAS) in the subsurface is critical for accurate risk assessments and design of effective remedial actions. A multi-process retention model is proposed to account for potential additional sources of retardation for PFAS transport in source zones. These include partitioning to the soil atmosphere, adsorption at air-water interfaces, partitioning to trapped organic liquids (NAPL), and adsorption at NAPL-water interfaces...
September 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28915029/rapid-one-pot-solvothermal-batch-synthesis-of-porous-nanocrystal-assemblies-composed-of-multiple-transition-metal-elements
#15
Masataka Ohtani, Tomoyuki Muraoka, Yuki Okimoto, Kazuya Kobiro
The ability of a rapid-heating solvothermal process to synthesize porous nanocrystal assemblies composed of the multiple transition metals was demonstrated. The rapid heating facilitated the quick formation of nascent nanocrystals to generate homogeneous mixed transition-metal oxides. Systematic studies of the synthesis of mixed-metal oxides under various experimental conditions indicated that the present simple method is suitable to develop a wide variety of binary and ternary transition-metal systems such as Co/Mn, Ni/Mn, and Co/Mn/Fe mixed-metal oxides...
September 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28915013/a-polyoxovanadate-resorcin-4-arene-based-porous-metal-organic-framework-as-an-efficient-multifunctional-catalyst-for-the-cycloaddition-of-co2-with-epoxides-and-the-selective-oxidation-of-sulfides
#16
Bing-Bing Lu, Jin Yang, Ying-Ying Liu, Jian-Fang Ma
In this work, we report a new polyoxovanadate-resorcin[4]arene-based metal-organic framework (PMOF), [Co2L0.5V4O12]·3DMF·5H2O (1), assembled with a newly functionalized wheel-like resorcin[4]arene ligand (L). 1 features an elegant porous motif and represents a rare example of PMOFs composed of both a resorcin[4]arene ligand and polyoxovanadate. Remarkably, 1 shows open V sites in the channel, which makes 1 an efficient heterogeneous Lewis acid catalyst for the cycloaddition of carbon dioxide to epoxides with high conversion and selectivity...
September 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28915007/synthesis-and-properties-of-2d-carbon-graphdiyne
#17
Zhiyu Jia, Yongjun Li, Zicheng Zuo, Huibiao Liu, Changshui Huang, Yuliang Li
Graphdiyne (GDY) is a flat material comprising sp(2)- and sp-hybridized carbon atoms with high degrees of π conjugation that features uniformly distributed pores. It is interesting not only from a structural point of view but also from the perspective of its electronic, chemical, mechanical, and magnetic properties. We have developed an in situ homocoupling reaction of hexaethynylbenzene on Cu foil for the fabrication of large-area ordered films of graphdiyne. These films are uniform and composed of graphdiyne multilayers...
September 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28914912/quasiperiodic-one-dimensional-photonic-crystals-with-adjustable-multiple-photonic-bandgaps
#18
Andrey M Vyunishev, Pavel S Pankin, Sergey E Svyakhovskiy, Ivan V Timofeev, Stepan Ya Vetrov
We propose an elegant approach to produce photonic bandgap (PBG) structures with multiple photonic bandgaps by constructing quasiperiodic photonic crystals (QPPCs) composed of a superposition of photonic lattices with different periods. Generally, QPPC structures exhibit both aperiodicity and multiple PBGs due to their long-range order. They are described by a simple analytical expression, instead of quasiperiodic tiling approaches based on substitution rules. Here we describe the optical properties of QPPCs exhibiting two PBGs that can be tuned independently...
September 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28914614/structural-control-in-porous-compact-multilayer-systems-grown-by-magnetron-sputtering
#19
Aurelio Garcia-Valenzuela, Carmen Lopez-Santos, Rafael Alvarez, Victor J Rico, Jose Cotrino, Agustin Rodriguez Gonzalez-Elipe, Alberto Palmero
In this work we analyze a phenomenon that takes place when growing magnetron sputtered porous/compact multilayer systems by alternating the oblique angle and the classical configuration geometries. We show that the compact layers develop numerous fissures rooted in the porous structures of the film below, in a phenomenon that amplifies when increasing the number of stacked layers. We demonstrate that these fissures emerge during growth due to the high roughness of the porous layers and the coarsening of a discontinuous interfacial region...
September 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28914540/adhesion-and-separation-of-nanoparticles-on-polymer-grafted-porous-substrates
#20
Kolattukudy P Santo, Aleksey Vishnyakov, Yefim Brun, Alexander V Neimark
This work explores interactions of functionalized nanoparticles (NP) with polymer brushes (PB) in a binary mixture of good and poor solvents. NP-PB systems are used in multiple applications, and we are particularly interested in the problem of chromatographic separation of NPs on polymer-grafted porous columns. This process involves NP flow through the pore channels with walls covered by PBs. NP-PB adhesion is governed by adsorption of polymer chains to NP surface and entropic repulsion caused by the polymer chain confinement between NP and the channel wall...
September 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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