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https://www.readbyqxmd.com/read/30103520/microwave-assisted-rapid-preparation-of-nano-zno-ag-composite-functionalized-polyester-nonwoven-membrane-for-improving-its-uv-shielding-and-antibacterial-properties
#1
Dongfeng Shao, Qufu Wei
The cost and efficiency of preparing ZnO/Ag composite functional polyester membrane affect their application, for which a rapid microwave-assisted method was studied for coating ZnO/Ag composite nanoparticles on polyester nonwoven. The surface morphology, crystalline structure, and surface chemistry of the uncoated and coated polyester nonwoven was investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and thermogravimetric (TG), respectively...
August 11, 2018: Materials
https://www.readbyqxmd.com/read/30102857/peripheral-membrane-proteins-facilitate-nanoparticle-binding-at-lipid-bilayer-interfaces
#2
Eric S Melby, Caley Allen, Isabel Foreman-Ortiz, Emily Caudill, Thomas R Kuech, Ariane M Vartanian, Xi Zhang, Catherine J Murphy, Rigoberto Hernandez, Joel A Pedersen
Molecular understanding of the impact of nanomaterials on cell membranes is critical for the prediction of effects that span environmental exposures to nano-enabled therapies. Experimental and computational studies employing phospholipid bilayers as model systems for membranes have yielded important insights but lack the biomolecular complexity of actual membranes. Here, we increase model membrane complexity by incorporating the peripheral membrane protein cytochrome c and studying the interactions of the resulting membrane systems with two types of anionic nanoparticles...
August 13, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/30048587/surface-engineered-biocatalytic-composite-membrane-for-reduced-protein-fouling-and-self-cleaning
#3
Anbharasi Vanangamudi, Daisuke Saeki, Ludovic F Dumée, Mikel C Duke, Todor Vasiljevic, Hideto Matsuyama, Xing Yang
A new biocatalytic nanofibrous composite ultrafiltration membrane was developed to reduce protein fouling interactions and self-clean the membrane surface. The dual layer poly(vinylidenefluoride)/nylon-6,6/chitosan (PNC) composite membrane contains a hydrophobic poly(vinylidenefluoride) cast support layer and a hydrophilic functional nylon-6,6/chitosan nanofibrous surface layer where enzymes were chemically attached. The intrinsic surface chemistry and high surface area of the nanofibers allowed optimal and stable immobilization of trypsin (TR) and α-chymotrypsin (CT) enzymes via direct covalent binding...
July 26, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30029200/emerging-nano-biosensing-with-suspended-mnp-microbial-extraction-and-eanp-labeling
#4
REVIEW
Leann Lerie Matta, Evangelyn C Alocilja
Emerging nano-biosensing with suspended MNP microbial extraction and EANP labeling may ensure a secure microbe-free food supply, as rapid response detection of microbial contamination is of utmost importance. Many biosensor designs have been proposed over the past two decades, covering a broad range of binding ligands, signal amplification, and detection mechanisms. These designs may consist of self-contained test strips developed from the base up with complicated nanoparticle chemistry and intricate ligand immobilization...
October 15, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/30024098/modulated-triple-material-nano-heterostructures-where-gold-influenced-the-chemical-activity-of-silver-in-nanocrystals
#5
Puspanjali Sahu, Gyanaranjan Prusty, Amit K Guria, Narayan Pradhan
For efficient charge separations, multimaterial hetero-nanostructures are being extensively studied as photocatalysts. While materials with one heterojunction are widely established, the chemistry of formation of multijunction heterostructures is not explored. This needs a more sophisticated approach and modulations. To achieve these, a generic multistep seed mediated growth following controlled ion diffusion and ion exchange is reported which successfully leads to triple-material hetero-nanostructures with bimetallic-binary alloy-binary/ternary semiconductors arrangements...
July 19, 2018: Small
https://www.readbyqxmd.com/read/30013216/surface-chemistry-and-buried-interfaces-in-all-inorganic-nanocrystalline-solids
#6
Emilio Scalise, Vishwas Srivastava, Eric Janke, Dmitri Talapin, Giulia Galli, Stefan Wippermann
Semiconducting nanomaterials synthesized using wet chemical techniques play an important role in emerging optoelectronic and photonic technologies. Controlling the surface chemistry of the nano building blocks and their interfaces with ligands is one of the outstanding challenges for the rational design of these systems. We present an integrated theoretical and experimental approach to characterize, at the atomistic level, buried interfaces in solids of InAs nanoparticles capped with Sn2 S6 4- ligands. These prototypical nanocomposites are known for their promising transport properties and unusual negative photoconductivity...
July 16, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/30007471/pretargeting-in-nuclear-imaging-and-radionuclide-therapy-improving-efficacy-of-theranostics-and-nanomedicines
#7
E Johanna L Stéen, Patricia E Edem, Kamilla Nørregaard, Jesper T Jørgensen, Vladimir Shalgunov, Andreas Kjaer, Matthias M Herth
Pretargeted nuclear imaging and radiotherapy have recently attracted increasing attention for diagnosis and treatment of cancer with nanomedicines. This is because it conceptually offers better imaging contrast and therapeutic efficiency while reducing the dose to radiosensitive tissues compared to conventional strategies. In conventional imaging and radiotherapy, a directly radiolabeled nano-sized vector is administered and allowed to accumulate in the tumor, typically on a timescale of several days. In contrast, pretargeting is based on a two-step approach...
October 2018: Biomaterials
https://www.readbyqxmd.com/read/29990737/synthesis-of-novel-magnetic-nano-sorbent-functionalized-with-n-methyl-d-glucamine-by-click-chemistry-and-removal-of-boron-with-magnetic-separation-method
#8
Servet Tural, Mehmet Şakir Ece, Bilsen Tural
Click chemistry refers to a group of reactions that are fast, simple to use, easy to purify, versatile, regiospecific, and give high product yields. Therefore, a novel, efficient magnetic nano-sorbent based on N-methyl-D-glucamine attached to magnetic nanoparticles was prepared using click coupling method. Its boron sorption capacity was compared with N-methyl-D-glucamine direct attached nano-sorbent. The characterization of the magnetic sorbents was investigated by several techniques such as X-ray diffraction, scanning electron microscope, transmission electron microscope, dynamic light scattering, thermogravimetric analysis, Fourier transform infrared spectrophotometer, and vibrating sample magnetometer...
October 30, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29988483/micro-and-nanofabrication-methods-to-control-cell-substrate-interactions-and-cell-behavior-a-review-from-the-tissue-engineering-perspective
#9
REVIEW
Menekse Ermis, Ezgi Antmen, Vasif Hasirci
Cell-substrate interactions play a crucial role in the design of better biomaterials and integration of implants with the tissues. Adhesion is the binding process of the cells to the substrate through interactions between the surface molecules of the cell membrane and the substrate. There are several factors that affect cell adhesion including substrate surface chemistry, topography, and stiffness. These factors physically and chemically guide and influence the adhesion strength, spreading, shape and fate of the cell...
September 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29987309/surface-chemistry-rheology-and-microstructure-of-purified-natural-and-synthetic-hectorite-suspensions
#10
Mingyong Du, Jishan Liu, Peta L Clode, Yee-Kwong Leong
Natural (N-) and synthetic (S-) hectorite suspensions were found to display significant time-dependent rheology or ageing behaviour and shear thinning flow behaviour. The ageing behaviour was characterised by an increasing yield stress with rest time. The yield stress continued to increase even after a week of rest, a reflection of a long process. An open sponge-like cellular microstructure formed by platelet particles interacting attractively in the overlapping edge-face configuration was captured by cryo-SEM of gel samples prepared at high pressure (∼2000 bar) and subjected to rapid cryo-freezing, for both N- and S-hectorite gels...
July 18, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29987308/hydrogen-adsorption-on-nano-structured-platinum-electrodes
#11
Oscar Diaz-Morales, Thomas J P Hersbach, Cansin Badan, Amanda C Garcia, Marc T M Koper
The "hydrogen region" of platinum is a powerful tool to structurally characterize nanostructured platinum electrodes. In recent years, the understanding of this hydrogen region has improved considerably: on Pt(111) sites, there is indeed only hydrogen adsorption, while on step sites, the hydrogen region involves the replacement of adsorbed hydrogen by adsorbed hydroxyl which interacts with co-adsorbed cations. However, the hydrogen region features an enigmatic and less well-understood "third hydrogen peak", which develops on oxidatively roughened platinum electrodes as well as on platinum electrodes with a high (110) step density that have been subjected to a high concentration of hydrogen...
July 10, 2018: Faraday Discussions
https://www.readbyqxmd.com/read/29975836/probing-intermolecular-interactions-within-the-amyloid-%C3%AE-trimer-using-a-tethered-polymer-nanoarray
#12
Sibaprasad Maity, Apurba Pramanik, Yuri L Lyubchenko
Amyloid oligomers are considered the most neurotoxic species of amyloid aggregates. Spontaneous assembly of amyloids into aggregates is recognized as a major molecular mechanism behind Alzheimer's disease and other neurodegenerative disorders involving protein aggregation. Characterization of such oligomers is extremely challenging but complicated by their transient nature. Previously, we introduced a flexible nanoarray (FNA) method enabling us to probe dimers assembled by the amyloid β (14-23) [Aβ (14-23)] peptide...
July 18, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29968534/verification-of-lc-ms-bioanalysis-by-nsmol-in-human-serum-between-original-and-biosimilar-therapeutic-antibody-infliximab
#13
Noriko Iwamoto, Kotoko Yokoyama, Megumi Takanashi, Atsushi Yonezawa, Kazuo Matsubara, Takashi Shimada
BACKGROUND: Infliximab (IFX) is a chimeric therapeutic monoclonal antibody targeting tumor necrosis factor alpha (TNFα)-mediated inflammatory immune diseases. However, despite of an initial good clinical response, decreasing of response in long-term treatment is a common observation. OBJECTIVE: Recent studies suggest that IFX level in circulation has a correlation with clinical bioavailability. Therefore, management of IFX dosage for individual manifestation by IFX monitoring may be valuable for the improvement of therapeutic response...
July 2, 2018: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/29966672/solution-plasma-mediated-formation-of-low-molecular-weight-chitosan-and-its-application-as-a-biomaterial
#14
MubarakAli Davoodbasha, Sang-Yul Lee, Jung-Wan Kim
Low molecular weight (LMW) chitosan has been a great attention in bio-molecular chemistry, medicine, and drug delivery system in particular. Depolymerization of high molecular weight (HMW) chitosan to LMW chitosan was achieved by solution plasma process (SPP) without affecting its chemical structures. Chitosan in solution was depolymerized by discharging plasma at 800 V with 35 kHz for various times (15-120 min). Gel permeation chromatography analysis revealed that molecular weight of chitosan decreased from 3...
June 30, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29951584/nanoscale-momentum-resolved-vibrational-spectroscopy
#15
Fredrik S Hage, Rebecca J Nicholls, Jonathan R Yates, Dougal G McCulloch, Tracy C Lovejoy, Niklas Dellby, Ondrej L Krivanek, Keith Refson, Quentin M Ramasse
Vibrational modes affect fundamental physical properties such as the conduction of sound and heat and can be sensitive to nano- and atomic-scale structure. Probing the momentum transfer dependence of vibrational modes provides a wealth of information about a materials system; however, experimental work has been limited to essentially bulk and averaged surface approaches or to small wave vectors. We demonstrate a combined experimental and theoretical methodology for nanoscale mapping of optical and acoustic phonons across the first Brillouin zone, in the electron microscope, probing a volume ~1010 to 1020 times smaller than that of comparable bulk and surface techniques...
June 2018: Science Advances
https://www.readbyqxmd.com/read/29950089/semiconductor-nanomembrane-materials-for-high-performance-soft-electronic-devices
#16
Mikayla A Yoder, Zheng Yan, Mengdi Han, John A Rogers, Ralph G Nuzzo
The development of methods to synthesize and physically manipulate extremely thin, single-crystalline inorganic semiconductor materials, so-called nanomembranes, has led to an almost explosive growth of research worldwide into uniquely enabled opportunities for their use in new "soft" and other unconventional form factors for high-performance electronics. The unique properties that nanomembranes afford, such as their flexibility and lightweight characteristics, allow them to be integrated into electronic and optoelectronic devices that, in turn, adopt these unique attributes...
July 25, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29949713/silver-toxicity-thresholds-for-multiple-soil-microbial-biomarkers
#17
Sotirios Vasileiadis, Gianluca Brunetti, Ezzat Marzouk, Steven Wakelin, George A Kowalchuk, Enzo Lombi, Erica Donner
Material flow analysis shows that soil is a key repository for silver (Ag) from (nano)silver-functionalized consumer products, but the potential effects of Ag toxicity, via Ag+ release, on soil microbial communities and their ecosystem services remains largely unknown. We examined the responses of multiple microbial biomarkers to increasing Ag+ doses (nine concentrations, 0-2000 mg kg-1 ) in nine different soils representing a wide range of soil properties. Analyses included substrate-induced microbial respiration, nine different soil enzyme activities, and quantification of bacterial 16S-rRNA (SSU) and fungal intergenic spacer (ITS) copies...
July 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29947390/harnessing-electrostatic-catalysis-in-single-molecule-electrochemical-and-chemical-systems-a-rapidly-growing-experimental-tool-box
#18
Simone Ciampi, Nadim Darwish, Heather M Aitken, Ismael Díez-Pérez, Michelle L Coote
Static electricity is central to many day-to-day practical technologies, from separation methods in the recycling of plastics to transfer inks in photocopying, but the exploration of how electrostatics affects chemical bonding is still in its infancy. As shown in the Companion Tutorial, the presence of an appropriately-oriented electric field can enhance the resonance stabilization of transition states by lowering the energy of ionic contributors, and the effect that follows on reaction barriers can be dramatic...
July 17, 2018: Chemical Society Reviews
https://www.readbyqxmd.com/read/29947364/diazonium-salt-chemistry-for-the-design-of-nano-textured-anti-icing-surfaces
#19
Sarra Gam-Derouich, Jean Pinson, Philippe Decorse, Yun Luo, Remy Herbaut, Laurent Royon, Claire Mangeney
Aryl diazonium salts have emerged as a new generation of robust surface modifiers for a wide range of applications. However, their use for creating anti-icing surfaces has never been investigated so far. We fill this gap by modifying nano-textured copper surfaces with aryl diazonium salts, bearing low surface energy end groups, leading to efficient anti-icing properties.
June 27, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29947211/three-dimensional-dna-origami-as-programmable-anchoring-points-for-bioreceptors-in-fiber-optic-surface-plasmon-resonance-biosensing
#20
Devin Daems, Wolfgang Pfeifer, Iene Rutten, Barbara Saccà, Dragana Spasic, Jeroen Lammertyn
Many challenges in biosensing originate from the fact that the all-important nanoarchitecture of the biosensor surface, including precise density and orientation of bioreceptors, is not entirely comprehended. Here, we introduced a three-dimensional DNA origami as a bioreceptor carrier to functionalize the fiber optic surface plasmon resonance (FO-SPR) sensor with nanoscale precision. Starting from a 24-helix bundle, two distinct DNA origami structures were designed to position thrombin-specific aptamers with different densities and distances (27 and 113 nm) from the FO-SPR surface...
July 18, 2018: ACS Applied Materials & Interfaces
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