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https://www.readbyqxmd.com/read/29786972/a-lyophilized-and-thermal-two-step-synthesis-of-cofe-alloy-nanoparticles-embedded-in-n-doped-carbon-nanosheets-carbon-nanotubes-for-highly-efficient-oxygen-evolution-reaction
#1
Yang Liu, Feng Li, Haidong Yang, Jing Li, Ping Ma, Yan Zhu, Jiantai Ma
There is a vital need to explore highly-efficient and stable nonprecious-metal catalysts for oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy conversion efficiency. Herein, we report a unique and cost-effective lyophilized and thermal two step procedure to synthesize high-performance CoFe alloy nanoparticles embedded in N-doped carbon nanosheets interspersed with carbon nanotubes (CoFe-N-CN/CNTs) hybrid. The lyophilization step during catalysts preparation is beneficial to uniform the dispersion of carbon-like precursors and avoid the agglomeration of metal particles...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786961/corrigendum-the-structural-fate-of-individual-multicomponent-metal-oxide-nanoparticles-in-polymer-nanoreactors
#2
Jingshan S Du, Peng-Cheng Chen, Brian Meckes, Zhuang Xie, Jinghan Zhu, Yuan Liu, Vinayak P Dravid, Chad A Mirkin
No abstract text is available yet for this article.
May 22, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29786901/degradable-polymers-and-nanoparticles-built-from-salicylic-acid
#3
Saeed Akkad, Christopher J Serpell
As more evidence emerges supporting the possibility that nonsteroidal anti-inflammatory drugs, especially aspirin (acetyl salicylic acid), might have a role in the prevention and management of certain types of cancer, there have been several attempts to fabricate salicylic acid-based polymers that can be employed in the targeted therapy of tumors. The primary disadvantage so far has been in use of nontherapeutic polymeric backbones that constitute the majority of the therapeutic particle's size. The focus of this research is the creation of a biodegradable polymer consisting only of salicylic acid, and its use as the main building block in targeted nanotherapeutics that would consequently provide both high local dose and sustained release of the active moiety...
May 22, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29786889/a-novel-conductive-mesoporous-layer-with-a-dynamic-two-step-deposition-strategy-boosts-efficiency-of-perovskite-solar-cells-to-20
#4
Haoxuan Sun, Kaimo Deng, Yayun Zhu, Min Liao, Jie Xiong, Yanrong Li, Liang Li
Lead halide perovskite solar cells (PSCs) with the high power conversion efficiency (PCE) typically use mesoporous metal oxide nanoparticles as the scaffold and electron-transport layers. However, the traditional mesoporous layer suffers from low electron conductivity and severe carrier recombination. Here, antimony-doped tin oxide nanorod arrays are proposed as novel transparent conductive mesoporous layers in PSCs. Such a mesoporous layer improves the electron transport as well as light utilization. To resolve the common problem of uneven growth of perovskite on rough surface, the dynamic two-step spin coating strategy is proposed to prepare highly smooth, dense, and crystallized perovskite films with micrometer-scale grains, largely reducing the carrier recombination ratio...
May 22, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29786853/cysteamine-modified-gold-nanoparticles-as-a-colorimetric-sensor-for-the-rapid-detection-of-gentamicin
#5
Joshua C Gukowsky, Chen Tan, Zexiang Han, Lili He
A simple, rapid, and specific colorimetric method for gentamicin detection using cysteamine-modified gold nanoparticles (cys-AuNPs) has been developed. The maximum residue limits of gentamicin allowed in foods are typically below 100 nM, so an effective detection method for low concentrations of the drug is required. The aggregation of gold nanoparticles (AuNPs) was used as the basis for this method, and adding cysteamine to the AuNPs helped to enhance their aggregative abilities. The cys-AuNPs are capable of detecting gentamicin concentrations as low as 12...
May 22, 2018: Journal of Food Science
https://www.readbyqxmd.com/read/29786767/oral-supplementation-of-lanthanum-zirconate-nanoparticles-moderately-affected-behavior-but-drastically-disturbed-leukocyte-count-serum-cholesterol-levels-and-antioxidant-parameters-from-vital-organs-of-albino-mice-in-a-gender-specific-manner
#6
Muhammad Nazar Aftab, Irum Naz Akram, Tafheem Khosa, Syeda Qandeel Zahra, Irum Bashir, Muhammad Naeem Ashiq, Furhan Iqbal
Lanthanum Zirconate nanoparticles (NPs) are used in blades of gas turbine engines to thermally insulate them and to protect them against hot and corrosive gas streams. However, the information regarding their biocompatibility is limited. The present study was aimed to report the effect of Lanthanum Zirconate NPs on selected aspects of behavior, serum biochemistry, complete blood count and antioxidant parameters from vital organs of albino mice in a gender specific manner. Albino mice, seven weeks old, were orally treated with 75 mg/ml solvent/Kg body weight of Lanthanum Zirconate nanoparticles for consecutive 22 days...
May 21, 2018: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29786764/encapsulation-of-micronutrients-resveratrol-genistein-and-curcumin-by-folic-acid-pamam-nanoparticles
#7
P Chanphai, H A Tajmir-Riahi
It has been shown that encapsulation of dietary polyphenols leads to increased solubility and bioavailability of these micronutrients. The encapsulation of dietary polyphenols resveratrol, genistein, and curcumin by folic acid-PAMAM-G3 and folic acid-PAMAM-G4 nanoparticles was studied in aqueous solution at physiological conditions, using multiple spectroscopic methods, TEM images, and docking studies. The polyphenol bindings are via hydrophilic, hydrophobic, and H-bonding contacts with resveratrol forming more stable conjugates...
May 21, 2018: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29786742/a-novel-alendronate-functionalized-nanoprobe-for-simple-colorimetric-detection-of-cancer-associated-hypercalcemia
#8
Abhishek Sahu, Youngmin Hwang, Cristian Vilos, Jong-Min Lim, Sunghyun Kim, Won Il Choi, Giyoong Tae
The calcium (Ca2+) ion concentration in the blood serum is tightly regulated, and any abnormalities in the level of serum calcium ions are associated with many potentially dangerous diseases. Thus, monitoring of the Ca2+ ion concentration in the blood serum is of fundamental importance. Gold nanoparticle (GNP)-based colorimetric biosensors have enormous potential in clinical diagnostic applications due to their simplicity, versatility, and unique optical properties. In this study, we have developed an alendronate functionalized gold nanoparticle (GNP-ALD) system for the measurement of Ca2+ ion concentration in biological samples...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786733/a-facet-controlled-rh-3-pb-2-s-2-nanocage-as-an-efficient-and-robust-electrocatalyst-toward-the-hydrogen-evolution-reaction
#9
Taekyung Kim, Jongsik Park, Haneul Jin, Aram Oh, Hionsuck Baik, Sang Hoon Joo, Kwangyeol Lee
Highly active and durable electrocatalysts for the hydrogen evolution reaction (HER) may play a pivotal role in commercial success of electrolytic water splitting technology. Among various material classes, binary metal sulphides show a great promise as HER catalysts because of their tunable energy levels conducive to a high catalytic activity and high robustness under harsh operating conditions. On the other hand, facet-controlled nanoparticles with controlled surface energies have gained great recent popularity as active and selective catalysts...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786727/rational-design-of-multi-functional-gold-nanoparticles-with-controlled-biomolecule-adsorption-a-multi-method-approach-for-in-depth-characterization
#10
Isaac Ojea-Jiménez, Robin Capomaccio, Inês Osório, Dora Mehn, Giacomo Ceccone, Rohanah Hussain, Giuliano Siligardi, Pascal Colpo, François Rossi, Douglas Gilliland, Luigi Calzolai
Multi-functionalized nanoparticles are of great interest in biotechnology and biomedicine, especially for diagnostic and therapeutic purposes. However, at the moment the characterization of complex, multi-functional nanoparticles is still challenging and this hampers the development of advanced nanomaterials for biological applications. In this work, we have designed a model system consisting of gold nanoparticles functionalized with two differentially-terminated poly(ethylene oxide) ligands, providing both "stealth" properties and protein-binding capabilities to the nanoparticles...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786726/boron-doped-graphene-nanosheet-supported-pt-a-highly-active-and-selective-catalyst-for-low-temperature-h-2-scr
#11
Maocong Hu, Zhenhua Yao, Lili Li, Yung-Hao Tsou, Liyuan Kuang, Xiaoyang Xu, Wen Zhang, Xianqin Wang
A series of boron-doped graphene-supported Pt (Pt/BG) nanosheets were designed and synthesized using a one-step facile hydrothermal method. ICP, XPS, and TPD results confirmed that boron atoms were successfully embedded into the graphene matrix. The selective catalytic reduction of nitric oxide with hydrogen (H2-SCR) was tested over Pt/BG catalysts. The multi-roles of doped-boron were investigated by Raman, BET, CO-chemisorption, H2-TPD, XPS, and NO-TPD. Boron doping led to a higher dispersion and smaller size of Pt nanoparticles, facilitated hydrogen spillover, promoted more metallic Pt formation, and increased both H2 and NO chemisorption, which were attributed to an enhanced Pt nucleation rate over doped-boron, electron donation from boron to Pt, and extra chemisorption sites...
May 22, 2018: Nanoscale
https://www.readbyqxmd.com/read/29786724/influence-of-a-nanoparticle-on-the-structure-and-dynamics-of-model-ionomer-melts
#12
Janani Sampath, Lisa M Hall
We simulate a single spherical nanoparticle (NP) surrounded by partially neutralized ionomers. The coarse-grained ionomers consist of a linear backbone of neutral monomer beads with charged pendant beads and counterions, along with pendant 'sticker' beads that represent unneutralized acid groups. Two different NP interactions are considered; one in which the NP interacts uniformly with all beads in the system (neutral NP) and another in which the NP has higher cohesive interactions with ions and stickers (sticky NP)...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29786715/cancer-cell-membrane-coated-magnetic-nanoparticles-for-mr-nir-fluorescence-dual-modal-imaging-and-photodynamic-therapy
#13
Jiong Li, Xuandong Wang, Dongye Zheng, Xinyi Lin, Zuwu Wei, Da Zhang, Zhuanfang Li, Yun Zhang, Ming Wu, Xiaolong Liu
Theranostic nanoprobes integrated with dual-modal imaging and therapeutic functions, such as photodynamic therapy (PDT), have exhibited significant potency in cancer treatments due to their high imaging accuracy and non-invasive advantages for cancer elimination. However, biocompatibility and highly efficient accumulation of these nanoprobes in tumor are still unsatisfactory for clinical application. In this study, a photosensitizer -loaded magnetic nanobead with surface further coated with a layer of cancer cell membrane (SSAP-Ce6@CCM) was designed to improve the biocompatibility and cellular uptake and ultimately achieve enhanced MR/NIR fluorescence imaging and PDT efficacy...
May 22, 2018: Biomaterials Science
https://www.readbyqxmd.com/read/29786651/clinical-efficacy-associated-with-enhanced-antioxidant-enzyme-activities-of-silver-nanoparticles-biosynthesized-using-moringa-oleifera-leaf-extract-against-cutaneous-leishmaniasis-in-a-murine-model-of-leishmania-major
#14
Manal El-Khadragy, Ebtesam M Alolayan, Dina M Metwally, Mohamed F Serag El-Din, Sara S Alobud, Nour I Alsultan, Sarah S Alsaif, Manal A Awad, Ahmed E Abdel Moneim
Leishmaniasis is one of the most significant vector-borne syndromes of individuals. This parasitic infection can be affected by many species of Leishmania, most of which are zoonotic. Natural products have made and are continuing to make important contributions to the search for new antileishmanial agents. The use of plants in the production assembly of silver nanoparticles has drawn attention because of its rapid, eco-friendly, non-pathogenic, economical protocol and provides a single step technique for the biosynthetic process...
May 22, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29786642/determining-the-radiation-enhancement-effects-of-gold-nanoparticles-in-cells-in-a-combined-treatment-with-cisplatin-and-radiation-at-therapeutic-megavoltage-energies
#15
Celina Yang, Kyle Bromma, Wonmo Sung, Jan Schuemann, Devika Chithrani
Combined use of chemotherapy and radiation therapy is commonly used in cancer treatment, but the toxic effects on normal tissue are a major limitation. This study assesses the potential to improve radiation therapy when combining gold nanoparticle (GNP) mediated radiation sensitization with chemoradiation compared to chemoradiation alone. Incorporation of GNPs with 2 Gy, 6 MV (megavoltage) radiation resulted in a 19 ± 6% decrease in survival of MDA-MB-231 cells. Monte-Carlo simulations were performed to assess dosimetric differences in the presence of GNPs in radiation...
May 22, 2018: Cancers
https://www.readbyqxmd.com/read/29786641/photothermal-effectiveness-of-magnetite-nanoparticles-dependence-upon-particle-size-probed-by-experiment-and-simulation
#16
Robert J G Johnson, Jonathan D Schultz, Benjamin J Lear
The photothermal effect of nanoparticles has proven efficient for driving diverse physical and chemical processes; however, we know of no study addressing the dependence of efficacy on nanoparticle size. Herein, we report on the photothermal effect of three different sizes (5.5 nm, 10 nm and 15 nm in diameter) of magnetite nanoparticles (MNP) driving the decomposition of poly(propylene carbonate) (PPC). We find that the chemical effectiveness of the photothermal effect is positively correlated with particle volume...
May 22, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29786605/hydrophobic-interaction-mediated-coating-of-pluronics-on-mesoporous-silica-nanoparticle-with-stimuli-responsiveness-for-cancer-therapy
#17
Luping Sha, Da Wang, Yuling Mao, Wei Shi, Tianbin Gao, Qinfu Zhao, Si-Ling Wang
In this research, a novel method was used to successfully make Pluronic P123 stably coated on mesoporous silica nanoparticles (MSN). That P123 and MSN co-constructed a drug delivery system (DDS) had not been reported. In this DDS, the coating of P123 was realized through hydrophobic interaction with octadecyl chain modified MSN. Experiments found only Pluronic with an appropriate ratio of hydrophilic and lipophilic segment could keep the nanoassemblies stable.
 For comparison, nanoassemblies consisted of P123 and octadecyl chain modified MSN with or without disulfide bond were prepared, which were denoted as PSMSN and PMSN respectively...
May 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29786467/bombesin-functionalized-64-cu-copper-sulfide-nanoparticles-for-targeted-imaging-of-orthotopic-prostate-cancer
#18
Huawei Cai, Fang Xie, Aditi Mulgaonkar, Lihong Chen, Xiankai Sun, Jer-Tsong Hsieh, Fangyu Peng, Rong Tian, Lin Li, Changqiang Wu, Hua Ai
AIM: To synthesize and evaluate the imaging potential of Bom-PEG-[64 Cu]CuS nanoparticles (NPs) in orothotopic prostate tumor. MATERIALS & METHODS: [64 Cu]CuS NPs were synthesized in aqueous solution by 64 CuCl2 and Na2 S reaction. Then PEG linker with or without bombesin peptide were conjugated to the surface of [64 Cu]CuS NPs to produce Bom-PEG-[64 Cu]CuS and PEG-[64 Cu]CuS NPs. These two kinds of NPs were used for testing specific uptake in prostate cancer cells in vitro and imaging of orthotopic prostate tumor in vivo...
May 22, 2018: Nanomedicine
https://www.readbyqxmd.com/read/29786466/mineralo-organic-nanoparticles-in-health-and-disease-an-overview-of-recent-findings
#19
Jan Martel, Cheng-Yeu Wu, Hsin-Hsin Peng, John D Young
We observed earlier that mineralo-organic nanoparticles form in human body fluids when the concentrations of calcium, carbonate and phosphate exceed saturation. The particles have been shown to represent mineral precursors in developing bones and teeth as well as in ectopic calcification and kidney stones. Recent studies suggest that the mineral particles may also be involved in other physiological processes, including immune tolerance against the gut microbiota and food antigens. We review here the involvement of mineralo-organic nanoparticles in physiological and pathological processes and discuss recent findings that reveal novel and unexpected roles for these particles in the human body...
May 22, 2018: Nanomedicine
https://www.readbyqxmd.com/read/29786444/exploring-the-confinement-effect-of-carbon-nanotubes-on-the-electrochemical-properties-of-prussian-blue-nanoparticles
#20
Ti-Wei Chen, Zhong-Qiu Li, Kang Wang, Feng-Bin Wang, Xing-Hua Xia
A novel and efficient photochemical method has been proposed for the encapsulation of Prussian blue nanoparticles (PBNPs) inside the channels of carbon nanotubes (PB-in-CNTs) in an acidic ferrocyanide solution under UV/Vis illumination and the confinement effect of CNTs on the electrochemical properties of PBNPs is systematically explored. PB-in-CNTs shows a faster electron transfer process, an enhanced electrocatalytic activity toward the reduction of H2O2 and an increased anti-base ability compared to PBNPs loaded outside of CNTs (PB-out-CNTs)...
May 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
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