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https://www.readbyqxmd.com/read/27922133/photoluminescence-changes-of-c70-nano-submicro-crystals-induced-by-high-pressure-and-high-temperature
#1
Dedi Liu, Bingbing Liu, Bertil Sundqvist, Dapeng Dong, Zhenghua Li, Dongping Liu
Hollow C70 nano/submicro-crystals with a fcc lattice structure were treated under various high pressure and high temperature conditions. The energy band structure was visibly changed by the high pressure and high temperature treatment, and the luminescence of the treated C70 nano/submicro-crystals were tuned from the visible to the near infrared range. In-situ high pressure experiments at room temperature indicate that pressure plays a key role in the tuning of the band gap and PL properties in C70 nanocrystals, and temperature plays an important role in the formation of stable intermolecular bonds and thus to define the final red-shift of the PL peaks...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921169/drying-kinetics-of-deformable-and-cracking-nano-porous-gels
#2
J Thiery, E Keita, S Rodts, D Courtier Murias, T Kodger, A Pegoraro, P Coussot
The desiccation of porous materials encompasses a wide range of technological and industrial processes and is acutely sensitive to the hierarchical structure of the porous materials resulting in complex dynamics which are challenging to unravel. Macroscopic observations of the surface and geometry of model colloidal gels during desiccation under controlled air flow highlight the role of crack formation in drying. The density of cracks and their rate of appearance depend on the initial solid fraction of the gels and their adherence to the substrate...
December 2016: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/27921087/acute-and-chronic-effects-of-gold-nanoparticles-on-sperm-parameters-and-chromatin-structure-in-mice
#3
Mahsa Nazar, Ali Reza Talebi, Mohammad Hosseini Sharifabad, Abolghasem Abbasi, Arezoo Khoradmehr, Amir Hossein Danafar
BACKGROUND: The particles in the range of 1-100 nm are called nanoparticles. Gold nanoparticle is one of the most important metal nanoparticles with wide usage. OBJECTIVE: This study investigated the effects of gold nanoparticles on sperm parameters and chromatin structure in mice. MATERIALS AND METHODS: In this experimental study, 72 male bulb-c mice were divided into 9 groups including: 4 Sham groups (Sc 1-4), 4 experimental groups (Au 1-4), and 1 control group (C)...
October 2016: International Journal of Reproductive Biomedicine (Yazd, Iran)
https://www.readbyqxmd.com/read/27920894/recent-advances-in-the-preparation-and-application-of-multifunctional-iron-oxide-and-liposome-based-nanosystems-for-multimodal-diagnosis-and-therapy
#4
REVIEW
Marzia Marciello, Juan Pellico, Irene Fernandez-Barahona, Fernando Herranz, Jesus Ruiz-Cabello, Marco Filice
Nowadays, thanks to the successful discoveries in the biomedical field achieved in the last two decades, a deeper understanding about the complexity of mechanistic aspects of different pathological processes has been obtained. As a consequence, even the standard therapeutic protocols have undergone a vast redesign. In fact, the awareness about the necessity to progress towards a combined multitherapy in order to potentially increase the final healing chances has become a reality. One of the crucial elements of this novel approach is that large amounts of detailed information are highly needed and in vivo imaging techniques represent one of the most powerful tools to visualize and monitor the pathological state of the patient...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27920526/in-vitro-inflammatory-effects-of-hard-metal-wc-co-nanoparticle-exposure
#5
Andrea L Armstead, Bingyun Li
Identifying the toxicity of nanoparticles (NPs) is an important area of research as the number of nanomaterial-based consumer and industrial products continually rises. In addition, the potential inflammatory effects resulting from pulmonary NP exposure are emerging as an important aspect of nanotoxicity. In this study, the toxicity and inflammatory state resulting from tungsten carbide-cobalt (WC-Co) NP exposure in macrophages and a coculture (CC) of lung epithelial cells (BEAS-2B) and macrophages (THP-1) at a 3:1 ratio were examined...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920525/fabrication-and-characterization-of-drug-loaded-nano-hydroxyapatite-polyamide-66-scaffolds-modified-with-carbon-nanotubes-and-silk-fibroin
#6
Meng-Zhu Yao, Ming-Yi Huang-Fu, Hui-Na Liu, Xia-Rong Wang, Xiaoxia Sheng, Jian-Qing Gao
Nano-hydroxyapatite/polyamide 66 (nHA/PA66) porous scaffolds were fabricated by a phase inversion method. Carbon nanotubes (CNTs) and silk fibroin (SF) were used to modify the surface of the nHA/PA66 scaffolds by freeze-drying and cross-linking. Dexamethasone was absorbed to the CNTs to promote the osteogenic differentiation of bone mesenchymal stem cells (BMSCs). The cell viability of BMSCs was investigated by changing the concentration of the CNT dispersion, and the most biocompatible scaffold was selected...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27920500/design-synthesis-and-evaluation-of-vegf-sirna-crs-as-a-novel-vector-for-gene-delivery
#7
Wen Zhao, Yifan Zhang, Xueyun Jiang, Chunying Cui
Small interfering RNA (siRNA) delivery is a prospective method in gene therapy, but it has application limitations such as negative charge, water solubility and high molecular weight. In this study, a safe and efficient nano-vector, CRS, was designed and synthesized to facilitate siRNA delivery. Physical and chemical properties of VEGF-siRNA/CRS were characterized by methods including scanning electron microscopy (SEM), transmission electron microscopy, zeta potential (ζ) measurement, drug-releasing rate measurement, gel electrophoresis and confocal microscopy...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27920433/polarization-conversion-when-focusing-cylindrically-polarized-vortex-beams
#8
Alexey P Porfirev, Andrey V Ustinov, Svetlana N Khonina
Currently, cylindrical beams with radial or azimuthal polarization are being used successfully for the optical manipulation of micro- and nano-particles as well as in microscopy, lithography, nonlinear optics, materials processing, and telecommunication applications. The creation of these laser beams is carried out using segmented polarizing plates, subwavelength gratings, interference, or light modulators. Here, we demonstrate the conversion of cylindrically polarized laser beams from a radial to an azimuthal polarization, or vice versa, by introducing a higher-order vortex phase singularity...
December 2016: Scientific Reports
https://www.readbyqxmd.com/read/27919539/nanostructured-fusiform-hydroxyapatite-particles-precipitated-from-aquaculture-wastewater
#9
Covadonga Correas, Michael L Gerardo, Alexander M Lord, Michael B Ward, Enrico Andreoli, Andrew R Barron
The present work represents a new approach for the isolation of uniform nano particulate hydroxyapatite (HAp). The chemical characterization of a calcium phosphate product obtained from industrial trout farm aquaculture wastewater by two different routes, washing either with a basic aqueous medium (washNaOH) or followed by a further washing with ethanol (washEtOH), is explored. Characterization of the isolated materials includes morphology studies (SEM and TEM), structural (XRD, electron diffraction), compositional (EDX) and thermogravimetric analysis (TGA)...
December 2, 2016: Chemosphere
https://www.readbyqxmd.com/read/27919268/air-liquid-interface-exposure-to-aerosols-of-poorly-soluble-nanomaterials-induces-different-biological-activation-levels-compared-to-exposure-to-suspensions
#10
Thomas Loret, Emmanuel Peyret, Marielle Dubreuil, Olivier Aguerre-Chariol, Christophe Bressot, Olivier le Bihan, Tanguy Amodeo, Bénédicte Trouiller, Anne Braun, Christophe Egles, Ghislaine Lacroix
BACKGROUND: Recently, much progress has been made to develop more physiologic in vitro models of the respiratory system and improve in vitro simulation of particle exposure through inhalation. Nevertheless, the field of nanotoxicology still suffers from a lack of relevant in vitro models and exposure methods to predict accurately the effects observed in vivo, especially after respiratory exposure. In this context, the aim of our study was to evaluate if exposing pulmonary cells at the air-liquid interface to aerosols of inhalable and poorly soluble nanomaterials generates different toxicity patterns and/or biological activation levels compared to classic submerged exposures to suspensions...
November 3, 2016: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/27918985/supporting-of-coupled-silver-halides-onto-clinoptilolite-nanoparticles-as-simple-method-for-increasing-their-photocatalytic-activity-in-heterogeneous-photodegradation-of-mixture-of-4-methoxy-aniline-and-4-chloro-3-nitro-aniline
#11
Sajad Jafari, Alireza Nezamzadeh-Ejhieh
Novel photocatalyts were synthesized by dispersion of AgX (X=I, Br, Cl) in nano clinoptilolite particles (NCP). The obtained composites (AgX-NCP) were used for the photodegrading of aqueous mixture of 4-methoxy aniline and 4-chloro-3-nitroaniline under Hg lamp irradiation. All samples were characterized by FT-IR, XRD, DRS and TEM. The effects of operational parameters such as: the loaded extent of AgX, the amount of photocatalyst, initial pH and concentration on photo mineralization were studied. The degradation extent was monitored by UV-Vis spectroscopy and the results were confirmed by the chemical oxygen demand (COD)...
November 29, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27918473/motion-of-adsorbed-nano-particles-on-azobenzene-containing-polymer-films
#12
REVIEW
Sarah Loebner, Joachim Jelken, Nataraja Sekhar Yadavalli, Elena Sava, Nicolae Hurduc, Svetlana Santer
We demonstrate in situ recorded motion of nano-objects adsorbed on a photosensitive polymer film. The motion is induced by a mass transport of the underlying photoresponsive polymer material occurring during irradiation with interference pattern. The polymer film contains azobenzene molecules that undergo reversible photoisomerization reaction from trans- to cis-conformation. Through a multi-scale chain of physico-chemical processes, this finally results in the macro-deformations of the film due to the changing elastic properties of polymer...
December 3, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27918420/synthetic-biodegradable-microparticle-and-nanoparticle-vaccines-against-the-respiratory-syncytial-virus
#13
REVIEW
Patricia A Jorquera, Ralph A Tripp
Synthetic biodegradable microparticle and nanoparticle platform technology provides the opportunity to design particles varying in composition, size, shape and surface properties for application in vaccine development. The use of particle vaccine formulations allows improvement of antigen stability and immunogenicity while allowing targeted delivery and slow release. This technology has been design to develop novel vaccines against the respiratory syncytial virus (RSV), the leading cause of lower respiratory tract infection in infants...
December 2, 2016: Vaccines
https://www.readbyqxmd.com/read/27918119/ferroelectric-enhanced-polysulfide-trapping-for-lithium-sulfur-battery-improvement
#14
Keyu Xie, You You, Kai Yuan, Wei Lu, Kun Zhang, Fei Xu, Mao Ye, Shanming Ke, Chao Shen, Xierong Zeng, Xiaoli Fan, Bingqing Wei
A brand new polysulfide entrapping strategy based on the ferroelectric effect has been demonstrated for the first time. By simply adding the nano-ferroelectrics (BaTiO3 nanoparticles) into the cathode, the heteropolar polysulfides can be anchored within the cathode due to the internal electric field originated from the spontaneous polarization BaTiO3 nanoparticles, and thus significantly improving the cycle stability of Li-S batteries.
December 5, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27918031/electrode-particle-impacts-a-users-guide
#15
Stanislav V Sokolov, Shaltiel Eloul, Enno Kätelhön, Christopher Batchelor-McAuley, Richard G Compton
We present a comprehensive guide to nano-impact experiments, in which we introduce newcomers to this rapidly-developing field of research. Central questions are answered regarding required experimental set-ups, categories of materials that can be detected, and the theoretical frameworks enabling the analysis of experimental data. Commonly-encountered issues are considered and presented alongside methods for their solutions.
December 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27917020/recent-approaches-in-designing-bioadhesive-materials-inspired-by-mussel-adhesive-protein
#16
REVIEW
Pegah Kord Forooshani, Bruce P Lee
Marine mussels secret protein-based adhesives, which enable them to anchor to various surfaces in a saline, intertidal zone. Mussel foot proteins (Mfps) contain a large abundance of a unique, catecholic amino acid, Dopa, in their protein sequences. Catechol offers robust and durable adhesion to various substrate surfaces and contributes to the curing of the adhesive plaques. In this article, we review the unique features and the key functionalities of Mfps, catechol chemistry, and strategies for preparing catechol-functionalized polymers...
January 1, 2017: Journal of Polymer Science. Part A, Polymer Chemistry
https://www.readbyqxmd.com/read/27916999/high-power-telecommunication-compatible-photoconductive-terahertz-emitters-based-on-plasmonic-nano-antenna-arrays
#17
Nezih Tolga Yardimci, Hong Lu, Mona Jarrahi
We present a high-power and broadband photoconductive terahertz emitter operating at telecommunication optical wavelengths, at which compact and high-performance fiber lasers are commercially available. The presented terahertz emitter utilizes an ErAs:InGaAs substrate to achieve high resistivity and short carrier lifetime characteristics required for robust operation at telecommunication optical wavelengths. It also uses a two-dimensional array of plasmonic nano-antennas to offer significantly higher optical-to-terahertz conversion efficiencies compared to the conventional photoconductive emitters, while maintaining broad operation bandwidths...
November 7, 2016: Applied Physics Letters
https://www.readbyqxmd.com/read/27916911/a-multipurpose-cmos-platform-for-nanosensing
#18
Alberto Bonanno, Alessandro Sanginario, Simone L Marasso, Beatrice Miccoli, Katarzyna Bejtka, Simone Benetto, Danilo Demarchi
This paper presents a customizable sensing system based on functionalized nanowires (NWs) assembled onto complementary metal oxide semiconductor (CMOS) technology. The Micro-for-Nano (M4N) chip integrates on top of the electronics an array of aluminum microelectrodes covered with gold by means of a customized electroless plating process. The NW assembly process is driven by an array of on-chip dielectrophoresis (DEP) generators, enabling a custom layout of different nanosensors on the same microelectrode array...
November 30, 2016: Sensors
https://www.readbyqxmd.com/read/27916905/drug-release-by-direct-jump-from-poly-ethylene-glycol-b-%C3%AE%C2%B5-caprolactone-nano-vector-to-cell-membrane
#19
Ugo Till, Laure Gibot, Anne-Françoise Mingotaud, Jérôme Ehrhart, Luc Wasungu, Christophe Mingotaud, Jean-Pierre Souchard, Alix Poinso, Marie-Pierre Rols, Frédéric Violleau, Patricia Vicendo
Drug delivery by nanovectors involves numerous processes, one of the most important being its release from the carrier. This point still remains unclear. The current work focuses on this point using poly(ethyleneglycol-b-ε-caprolactone) micelles containing either pheophorbide-a (Pheo-a) as a fluorescent probe and a phototoxic agent or fluorescent copolymers. This study showed that the cellular uptake and the phototoxicity of loaded Pheo-a are ten times higher than those of the free drug and revealed a very low cellular penetration of the fluorescence-labeled micelles...
November 30, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27916822/potential-of-wake-up-radio-based-mac-protocols-for-implantable-body-sensor-networks-ibsn-a-survey
#20
Vignesh Raja Karuppiah Ramachandran, Eyuel D Ayele, Nirvana Meratnia, Paul J M Havinga
With the advent of nano-technology, medical sensors and devices are becoming highly miniaturized. Consequently, the number of sensors and medical devices being implanted to accurately monitor and diagnose a disease is increasing. By measuring the symptoms and controlling a medical device as close as possible to the source, these implantable devices are able to save lives. A wireless link between medical sensors and implantable medical devices is essential in the case of closed-loop medical devices, in which symptoms of the diseases are monitored by sensors that are not placed in close proximity of the therapeutic device...
November 29, 2016: Sensors
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