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https://www.readbyqxmd.com/read/28821114/preparation-and-characterization-of-a-composite-biomaterial-including-starch-micro-nano-particles-loaded-chitosan-gel
#1
Dorsa Dehghan Baniani, Reza Bagheri, Atefeh Solouk
Thermosensitive Chitosan hydrogels which can be injected into defects with minimally invasive approach were prepared. Also starch micro/nano particles were synthesized via water-in-oil (W/O) miniemulsion technique. The starch particles were incorporated into the chitosan hydrogel to prepare injectable thermosensitive hydrogel composites. Tube inverting method, compression tests, swelling studies, XRD, SEM, OM, DLS, UV-vis spectroscopy were used for investigations. Results revealed that increasing crosslinker and surfactant contents and stirring rate leads to particle size reduction...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820570/engineering-of-micro-to-nano-structured-3d-printed-drug-releasing-titanium-implants-for-enhanced-osseointegration-and-localized-delivery-of-anticancer-drugs
#2
Shaheer Maher, Gagandeep Kaur, Luis Lima-Marques, Andreas Evdokiou, Dusan Losic
Primary and secondary bone cancers are major causes of pathological bone fractures and their treatment through implant fixation and conventional chemotherapy has many limitations. These implants may suffer from poor osseointegration and their rejection is causing repeated surgery, patient's suffering and extensive expenses. On the other hand, there are severe systemic adverse effects of toxic chemotherapeutics administrated using conventional drug delivery. In this paper to address these two problems we present new type of localized drug-releasing titanium implants with enhanced implants' bio-integration and drug release capabilities that could provide high concentration of toxic anticancer drugs locally to treat bone cancers...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28820220/real-time-plasmon-spectroscopy-study-of-the-solid-state-oxidation-and-kirkendall-void-formation-in-copper-nanoparticles
#3
Mariano D Susman, Yishai Feldman, Tatyana A Bendikov, Alexander Vaskevich, Israel Rubinstein
Oxidation and corrosion reactions have a major effect on the application of non-noble metals. Kinetic information and simple theoretical models are often insufficient for describing such processes in metals at the nanoscale, particularly in cases involving formation of internal voids (nano Kirkendall effect, NKE) during oxidation. Here we study the kinetics of solid-state oxidation of chemically-grown copper nanoparticles (NPs) by in situ localized surface plasmon resonance (LSPR) spectroscopy during isothermal annealing in the range 110-170 °C...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820208/positive-zeta-potential-of-nanodiamonds
#4
Laia Ginés, Soumen Mandal, Ashek-I-Ahmed, Chia-Liang Cheng, Maabur Sow, Oliver A Williams
In this paper, the origin of positive zeta potential exhibited by nanodiamond particles is explained. Positive zeta potentials in nano-structured carbons can be explained by the presence of graphitic planes at the surface, which leave oxygen-free Lewis sites and so promotes the suppression of acidic functional groups. Electron Microscopy and Raman Spectroscopy have been used to show that positive zeta potential of nanodiamond is only exhibited in the presence of sp(2) carbon at the surface.
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28819924/dynamic-imaging-of-mitochondrial-membrane-proteins-in-specific-sub-organelle-membrane-locations
#5
REVIEW
Timo Appelhans, Karin B Busch
Mitochondria are cellular organelles with multifaceted tasks and thus composed of different sub-compartments. The inner mitochondrial membrane especially has a complex nano-architecture with cristae protruding into the matrix. Related to their function, the localization of mitochondrial membrane proteins is more or less restricted to specific sub-compartments. In contrast, it can be assumed that membrane proteins per se diffuse unimpeded through continuous membranes. Fluorescence recovery after photobleaching is a versatile technology used in mobility analyses to determine the mobile fraction of proteins, but it cannot provide data on subpopulations or on confined diffusion behavior...
August 17, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28819672/folding-sticky-elastica-dynamics-and-reversibility-of-folds-in-langmuir-monolayers
#6
L C Foucard, J M Eaton, M Dennin, Alex J Levine
Lipid monolayers at the air/water interface are often subject to large mechanical stresses when compressed laterally. For large enough compression they fold in the out-of-plane direction to relax stress. The repetitive folding and unfolding of lung surfactant monolayers during breathing plays a critical role in conserving monolayer material at the air/water interface lining the lung. Although the mechanisms behind the folding have been explored recently, relatively little information exists regarding the implications of folding dynamics on the long-term stability of the monolayer...
August 18, 2017: Soft Matter
https://www.readbyqxmd.com/read/28819119/the-synergistic-effects-of-the-micro-and-nano-particles-in-micro-nano-composites-on-enhancing-the-resistance-to-electrical-tree-degradation
#7
Wenxuan Wang, Ying Yang
A new method of increasing the durability and reliability of polymer dielectrics has been proposed by designing a composite structure of the micro and nano particles. The synergistic effects of the micro particles and nano particles are found to enhance the resistance to electrical tree and extend the lifetime of polymer dielectrics for insulations. Epoxy loaded with the micro and nano SiO2 particles at different concentrations are prepared as micro-nano composites. The micro particles show the blocking effects on the electrical tree channel and the interfaces of the nano particles lead to the inhibiting effects on the tree inception and propagation...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819103/mass-production-of-polymer-nano-wires-filled-with-metal-nano-particles
#8
Nino Lomadze, Alexey Kopyshev, Matias Bargheer, Markus Wollgarten, Svetlana Santer
Despite the ongoing progress in nanotechnology and its applications, the development of strategies for connecting nano-scale systems to micro- or macroscale elements is hampered by the lack of structural components that have both, nano- and macroscale dimensions. The production of nano-scale wires with macroscale length is one of the most interesting challenges here. There are a lot of strategies to fabricate long nanoscopic stripes made of metals, polymers or ceramics but none is suitable for mass production of ordered and dense arrangements of wires at large numbers...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817289/how-to-drive-a-flashing-electron-ratchet-to-maximize-current
#9
Ofer Kedem, Bryan Lau, Emily A Weiss
Biological systems utilize a combination of asymmetry, noise, and chemical energy to produce motion in the highly damped environment of the cell with molecular motors, many of which are "ratchets", non-equilibrium devices for producing directed transport using non-directional perturbations, without a net bias. The underlying ratchet principle has been implemented in man-made micro- and nano-devices, to transport charged particles by oscillating an electric potential with repeating asymmetric features. In this experimental study, the ratcheting of electrons in an organic semiconductor is optimized by tuning the temporal modulation of the oscillating potential, applied using nanostructured electrodes...
August 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28816007/fluorous-phase-directed-peptide-assembly-affords-nano-peptisomes-capable-of-ultrasound-triggered-cellular-delivery
#10
Scott H Medina, Megan S Michie, Stephen E Miller, Martin J Schnermann, Joel P Schneider
Here, we report the design, synthesis and efficacy of a new class of ultrasound (US)-sensitive self-assembled peptide-based nanoparticle. Peptisomes are prepared via templated assembly of a de novo designed peptide at the interface of fluorinated nanodroplets. Utilizing peptide assembly allows for facile particle synthesis, direct incorporation of bioactive sequences displayed from the particle corona, and the ability to easily encapsulate biologics during particle preparation using a mild solvent exchange procedure...
August 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28810200/influences-of-tio2-nanoparticles-on-dietary-metal-uptake-in-daphnia-magna
#11
Cheng Tan, Wen-Xiong Wang
Increasing applications of titanium dioxide nanoparticles (nano-TiO2) have intensified the risk of environmental contamination. Since nano-TiO2 can absorb metals and be consumed as 'food' by zooplankton but also can interact with phytoplankton, they could significantly disturb the existing metal assimilation patterns. In the present study, we quantified the dietary assimilation of Cd and Zn from nano-TiO2 and algae (Chlamydomonas reinhardtii) at comparable particle concentrations as well as in complex food environment (variable food quality and quantity) in a freshwater zooplankton Daphnia magna using the radiotracer technique...
August 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28809982/coordination-polymer-derived-nano-sized-zinc-ferrite-with-excellent-performance-in-nitro-explosive-detection
#12
Debal Kanti Singha, Partha Mahata
Herein, a mixed metal coordination polymer, {(H2pip)[Zn1/3Fe2/3(pydc-2,5)2(H2O)]·2H2O} 1 {where H2pip = piperazinediium and pydc-2,5 = pyridine-2,5-dicarboxylate}, was successfully synthesized using a hydrothermal technique. To confirm the structure and phase purity of 1, single crystals of an isomorphous pure Fe compound, {(H2pip)[Fe(pydc-2,5)2(H2O)]·2H2O} 1a, were synthesized based on similar synthetic conditions. Single crystal X-ray data of 1a confirmed the one-dimensional anionic metal-organic coordination polymer hydrogen bonded with protonated piprazine (piperazinediium) and lattice water molecules...
August 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28809092/particle-targeting-in-complex-biological-media
#13
REVIEW
Qiong Dai, Nadja Bertleff-Zieschang, Julia A Braunger, Mattias Björnmalm, Christina Cortez-Jugo, Frank Caruso
Over the past few decades, nanoengineered particles have gained increasing interest for applications in the biomedical realm, including diagnosis, imaging, and therapy. When functionalized with targeting ligands, these particles have the potential to interact with specific cells and tissues, and accumulate at desired target sites, reducing side effects and improve overall efficacy in applications such as vaccination and drug delivery. However, when targeted particles enter a complex biological environment, the adsorption of biomolecules and the formation of a surface coating (e...
August 15, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28808467/comparison-of-the-penetration-depth-of-conventional-and-nano-particle-calcium-hydroxide-into-dentinal-tubules
#14
Vahid Zand, Hadi Mokhtari, Aila Hasani, Golchin Jabbari
INTRODUCTION: The aim of this in vitro study was to evaluate and compare the penetration depth of conventional (CH) and nano-particle calcium hydroxide (NCH) into dentinal tubules. METHODS AND MATERIALS: Ninety human single-rooted teeth were instrumented by RaCe rotary system and after chemomechanical preparation were randomly divided in two equal groups (n=45). In the first group conventional CH and in the other NCH was used as intracanal medicament. After 2 weeks of incubation all roots were intentionally split at longitudinal axis and prepared for scanning electron microscope (SEM) observation...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/28802948/modelling-the-toxicity-of-a-large-set-of-metal-and-metal-oxide-nanoparticles-using-the-ochem-platform
#15
Vasyl Kovalishyn, Natalia Abramenko, Iryna Kopernyk, Larysa Charochkina, Larysa Metelytsia, Igor V Tetko, Willie Peijnenburg, Leonid Kustov
Inorganic nanomaterials have become one of the new areas of modern knowledge and technology and have already found an increasing number of applications. However, some nanoparticles show toxicity to living organisms, and can potentially have a negative influence on environmental ecosystems. While toxicity can be determined experimentally, such studies are time consuming and costly. Computational toxicology can provide an alternative approach and there is a need to develop methods to reliably assess Quantitative Structure-Property Relationships for nanomaterials (nano-QSPRs)...
August 9, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28802567/nano-sized-and-other-improved-reporters-for-magnetic-resonance-imaging-of-angiogenesis
#16
Simonetta Geninatti Crich, Enzo Terreno, Silvio Aime
Magnetic Resonance Imaging (MRI) enables to provide anatomical, functional and molecular information of pathological angiogenesis when used with properly tailored imaging probes. Functional studies have been the domain of Dynamic Contrast Enhancement (DCE) -MRI protocols from which it is possible to extract quantitative estimations on key parameters such as the volumes of vascular and extracellular compartments and the rates of the bidirectional exchange of the imaging reporters across the endothelial barrier...
August 9, 2017: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/28800084/the-dry-sliding-wear-properties-of-nano-sized-ticp-al-cu-composites-at-elevated-temperatures
#17
Wei-Si Tian, Qing-Long Zhao, Chuan-Jiang Zhao, Feng Qiu, Qi-Chuan Jiang
Nano-sized ceramic particle reinforced aluminum composites exhibit excellent room-temperature mechanical properties. However, there is limited research on the dry sliding wear behavior of those composites at elevated temperatures, which should be one of the major concerns on elevated temperature applications. Here the Al-Cu composites reinforced with nano-sized TiCp were fabricated. The dry sliding wear behaviors of the nano-sized TiCp/Al-Cu composites at various temperatures (140-220 °C) and loads (10-40 N) with different TiCp contents were studied, and the results showed that the nanocomposites exhibited superior wear resistance...
August 11, 2017: Materials
https://www.readbyqxmd.com/read/28799931/study-on-non-linear-equilibrium-kinetics-and-thermodynamic-of-deltamethrin-removal-in-aqueous-solution-using-modified-magnetic-iron-oxide-nanoparticles
#18
Bahareh Ghafari, Elham Moniri, Homayon Ahmad Panahi, Abdolreza Karbassi, Shaban Najafpour
The purpose of modification of magnetic iron oxide nanoparticles is an eco-friendly, emerging and economical method for removing deltamethrin in the aqueous solution and wastewater effluents when compared with other adsorbent methods. Modified magnetic iron oxide nanoparticles were synthesized by co-precipitation and then coupled with 3-hydroxytyraminium chloride. The nano-sorbent was characterized by thermogravimetric analysis, elemental analysis, transmission electron microscopy, scanning electron microscope, Fourier transform infrared spectroscopy, zero point charge and surface area determination...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28795697/perovskite-based-photodetectors-materials-and-devices
#19
REVIEW
Huan Wang, Dong Ha Kim
While the field of perovskite-based optoelectronics has mostly been dominated by photovoltaics, light-emitting diodes, and transistors, semiconducting properties peculiar to perovskites make them interesting candidates for innovative and disruptive applications in light signal detection. Perovskites combine effective light absorption in the broadband range with good photo-generation yield and high charge carrier mobility, a combination that provides promising potential for exploiting sensitive and fast photodetectors that are targeted for image sensing, optical communication, environmental monitoring or chemical/biological detection...
August 10, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28794458/confinement-suppresses-instabilities-in-particle-laden-droplets
#20
Lalit Bansal, Saptarshi Basu, Suman Chakraborty
Tiny concentrations of suspended particles may alter the behavior of an evaporating droplet remarkably, leading to partially viscous and partially elastic dynamical characteristics. This, in turn, may lead to some striking mechanical instabilities, such as buckling and rupture. Here, we report certain non-trivial implications of the consequent morpho-dynamics (macro to nano scales), when such an evaporating droplet is encapsulated in a confined environment. Compared to unconfined scenario, we report non-intuitive suppression of rupturing beyond a critical confinement...
August 9, 2017: Scientific Reports
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