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Blue nanoparticles

Gitashree Darabdhara, Purna K Boruah, Manash R Das
This work describes the preparation of bimetallic Cu-Pd nanoparticles (NPs) on supports like reduced graphene oxide (rGO), graphitic carbon nitride (g-C3 N4 ) and MoS2 sheets with a size of <10 nm. rGO is found to be the best support for synthesizing Cu-Pd NPs with controlled shape, size and oxidation state. The Cu-Pd/rGO nanocomposite also demonstrated the best peroxidase and oxidase mimicking activity compared to Cu-Pd/g-C3 N4 and Cu-Pd/MoS2 nanocomposites. The peroxidase mimicking activity of Cu-Pd/rGO was investigated in more detail, and a glucose oxidase (GOx) based glucose sensor was constructed that is based on the enzymatic formation of H2 O2 and the Cu-Pd NPs-assisted oxidation of tetramethylbenzidine by H2 O2 to give a blue-green coloration with absorption maxima at 652 nm...
December 11, 2018: Mikrochimica Acta
Vishal Govind Rao, Umar Aslam, Suljo Linic
Performing electron-transfer reactions on metal nanoparticles requires separation of charge carriers at the nanoparticle and their transfer to the reacting molecules. Inducing these reactions using light is challenging due to the exceedingly short lifetimes of energetic charge carriers formed in metal nanoparticles under light illumination. The results described here show that certain conditions must be met to drive these electron-transfer reactions on plasmonic nanoparticles. One critical requirement is that the process of electronic excitation takes place at the nanoparticle/molecule interface...
December 11, 2018: Journal of the American Chemical Society
Qin Yu, Xiao-Qin Xiong, Lei Zhao, Ting-Ting Xu, Hao Bi, Rong Fu, Qian-Hua Wang
Biodistribution and toxicity assessment are critical for safe clinical use of newly developed medicines. Superparamagnetic iron oxide nanoparticles (SPION) are effective carriers for targeted drug delivery. This study aimed to examine the toxicity and biodistribution of SPION coated with polyethylenimine (PEI) (SPION-PEI) designed for small interfering RNA (siRNA) delivery both in vitro and in vivo. SPION-PEI/siRNA complexes were prepared at different weight ratios. Cytotoxic effects of SPION-PEI/siRNA on HSC-T6 cell viability were determined by using 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT)...
December 2018: Current medical science
Yi-Wei Wang, Qiao Liu, Lixing Wang, Shurong Tang, Huang-Hao Yang, Hongbo Song
A one-step reduction method was used for the preparation of stable graphitic carbon nitride-gold nanoparticles (g-C3 N4 -Au) nanocomposites from ultrathin g-C3 N4 nanosheets and chloroauric acid by using NaBH4 as a reducing agent under ultrasonication. The nanocomposites were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis absorption and fluorescence spectroscopy etc. The results revealed that the gold nanoparticles (AuNPs) are uniformly formed on the g-C3 N4 nanosheets...
December 10, 2018: Mikrochimica Acta
Abolghasem Abbasi Kajani, Abdol-Khalegh Bordbar
A comprehensive study was conducted toward the green and facile synthesis of biocompatible magnetite nanoparticles for the efficient removal of organic contaminants from water. The nanoparticles were synthesized using a modified co-precipitation method and functionalized by the taxane diterpenoids extracted from Taxus baccata L., and fully characterized using UV-vis spectroscopy, SEM, FTIR, VSM, and XRD. The synthesized monodisperse magnetite nanoparticles, with a narrow size distribution of less than 50 nm, displayed significant and stable magnetic activity without surface oxidation after several months...
December 1, 2018: Journal of Hazardous Materials
Sara Haji Hosseinali, Zahra Pourmokhtar Boushehri, Behnam Rasti, Mirsasan Mirpour, Koorosh Shahpasand, Mojtaba Falahati
Nickel oxide nanoparticles (NiO NPs) have been used in the biological and medical sciences. However, their toxic effects against biological systems such as nervous system have not been well studied. Therefore, the adverse effect of NiO NPs on tau structure was investigated by fluorescence and CD spectroscopic methods as well as TEM study. Also, molecular dynamic study was run to extend the experimental data. Cytotoxic activity of NiO NPs against SH-SY5Y cell was determined by trypan blue exclusion, cell morphology, ROS, and apoptosis assays...
December 6, 2018: International Journal of Biological Macromolecules
Cecilia Fernández-Ponce, Juan P Muñoz-Miranda, Desiré M de Los Santos, Enrique Aguado, Francisco García-Cozar, Rocío Litrán
Hydrophilic and homogeneous sub-10 nm blue light-emitting gold nanoparticles (NPs) functionalized with different capping agents have been prepared by simple chemical routes. Structure, average, size, and surface characteristics of these NPs have been widely studied, and the stability of colloidal NP solutions at different pH values has been evaluated. Au NPs show blue PL emission, particularly in the GSH capped NPs, in which the thiol-metal core transference transitions considerably enhance the fluorescent emission...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
Paul A Charpentier, Chao Chen, Koosha Azhie, Bernd Grohe, Md Abdul Mumin, Adria F Lotus, Patrick Therrien, Silvia Mittler
Visible region active photocatalytic coatings are of interest for antimicrobial activity in low light applications or those employing LED lights with limited UV content. This work examined Ag and Fe doped titania nanoparticles (nTiO2) with varying dopant ranges in polyaspartic polymer coatings for potential light and dark activity. First, the Ag and Fe doped nTiO2 were synthesized by sol-gel chemistry with varying dopant concentrations, then characterized with respect to their size and aggregate size distribution, crystallinity, and surface and band gap features...
November 30, 2018: Nanotechnology
Avigdor Leftin, Jason A Koutcher
Magnetic resonance imaging applications utilizing nanoparticle agents for polarized macrophage detection are conventionally analyzed according to iron-dependent parameters averaged over large regions of interest (ROI). However, contributions from macrophage iron deposits are usually obscured in these analyses due to their lower spatial frequency and smaller population size compared with the bulk of the tumor tissue. We hypothesized that, by addressing MRI and histological pixel contrast heterogeneity using computer vision image analysis approaches rather than statistical ROI distribution averages, we could enhance our ability to characterize deposits of polarized tumor-associated macrophages (TAMs)...
2018: Contrast Media & Molecular Imaging
Jounghyun Yoo, Seulgi Han, Wonchan Park, Taehyung Lee, Yoonsang Park, Heemin Chang, Sei Kwang Hahn, Woosung Kwon
With biocompatibility, biodegradability, and high functionality, silica nanoparticles (SNPs) have been widely investigated for various biomedical applications. However, lack of optical fluorescence has limited the application of SNPs as a degradable imaging agent. Here, we hydrothermally synthesized fluorescent SNPs by artificially generating optically active defect centers using tetraethyl orthosilicate and (3-aminopropyl)trimethoxysilane. The synthesized SNPs demonstrated strong blue photoluminescence originating from the dioxasilyrane (=Si(O2)) and silylene (=Si:) defect centers with the aid of aminopropyl groups...
December 3, 2018: ACS Applied Materials & Interfaces
Arivalagan Pugazhendhi, Raju Prabhu, Kavitha Muruganantham, Rajasree Shanmuganathan, Suganthy Natarajan
A rapid and ecofriendly fabrication of metal oxide nanoparticles using biogenic sources is the current trend being used to replace the toxic chemical method. The present study was carried out to synthesize magnesium oxide nanoparticles (MgONPs) using the marine brown algae Sargassum wighitii as the reducing and capping agent. The as-prepared MgONPs were characterized by spectroscopic and microscopic analyses. UV-visible spectrum of the MgONPs showed a sharp absorption peak at 322 nm. X- ray diffraction analysis illustrated that the MgONPs were crystalline in nature with a face-centered cubic structure...
November 23, 2018: Journal of Photochemistry and Photobiology. B, Biology
M I A Abdel Maksoud, Gharieb S El-Sayyad, A H Ashour, Ahmed I El-Batal, Mohamed A Elsayed, Mohamed Gobara, Ahmed M El-Khawaga, E K Abdel-Khalek, M M El-Okr
This study reports the photocatalytic degradation of Methylene Blue (MB) dye (a class of dyestuffs that are resistant to biodegradation) under the influence of UV-light irradiation. Antibacterial and antibiofilm activities of ferrite nanoparticles (FO NPs) were examined against some pathogenic bacteria isolated from the medical operating room surfaces. In the same context, metals-substituted spinel cobalt ferrite nanoparticles with nominal composition [Mx Co1-x Fe2 O4 NPs; (M = Zn, Cu, Mn; x = 0.0, 0...
November 28, 2018: Microbial Pathogenesis
N Babitha, L Srimathi Priya, S Rosy Christy, A Manikandan, A Dinesh, M Durka, S Arunadevi
Semiconductor ZnO samples with two different morphologies such as nanoparticles (ZnO-NPs) and nano-sheets (ZnO-NSs) was successfully prepared by microwave heating (MHM) and modified sol-gel (SGM) method, respectively using Pedalium Murex plant extract as the bio-reducing agent. Structural, purity and morphology of the samples was examined by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis. Optical property analysis and band gap calculation were carried out by UV-Visible diffuse reflectance (DRS) and photoluminescence (PL) spectroscopy techniques...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Bindu Thomas, B Scholastica Mary Vithiya, T Augustine Arul Prasad, S B Mohamed, C Maria Magdalane, K Kaviyarasu, M Maaza
The purpose of this study is to minimize the negative impacts of synthetic procedures and to develop environmentally benign procedures for the synthesis of metallic nanoparticles. In the present study, Passiflora edulis f. flavicarpa ( P. edulis ) aqueous leaf extract mediated green synthesis of silver nanoparticles are described. The synthesized silver nanoparticles were characterized by UV-Vis Spectroscopy, Fluorescence Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) Transmission Electron Microscopy (TEM) and Cyclic Voltammetry (CV)...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Ranran Zhao, Jie Jiang, Huiwen Li, Min Chen, Renfa Liu, Sujuan Sun, De Ma, Xiaolong Liang, Shumin Wang
BACKGROUND AND PURPOSE: Inflammatory reaction plays a crucial role in cerebral ischemia reperfusion (IR) injury. It has been shown that activated microglia long-term existed in cerebral ischemia and induced second injury. Therefore, we hypothesize that prepared phosphatidylserine (PS)-modified microbubbles (PS-MBs) combined with ultrasound-targeted microbubble destruction (UTMD) can safely open the blood-brain barrier (BBB) and target activated microglia for inflammatory area in the later stage of ischemia reperfusion...
November 30, 2018: Journal of Neuroinflammation
Ruichan Lv, Miao Feng, Wolfgang J Parak
Up-conversion nanoparticles (UCNP) under near-infrared (NIR) light irradiation have been well investigated in the field of bio-imaging. However, the low up-conversion luminescence (UCL) intensity limits applications. Plasmonic modulation has been proposed as an effective tool to adjust the luminescence intensity and lifetime. In this study discrete dipole approximation (DDA) was explored concerning guiding the design of UCNP@mSiO₂-Au structures with enhanced UCL intensity. The extinction effects of gold shells could be changed by adjusting the distance between the UCNPs and the Au NPs by synthesized tunable mesoporous silica (mSiO₂) spacers...
November 29, 2018: Nanomaterials
Yanan Zhang, Yu Yang, Haichao Duan, Changli Lü
Magnetic Fe3O4@catechol-formaldehyde resin (CFR) core-shell nanospheres were fabricated via a controllable hydrothermal method. The shell thickness of Fe3O4@CFR nanospheres can be effectively regulated in the range of 10~170 nm via adjusting reaction parameters. Especially, catechol groups on the surface of nanospheres also play a significant role in mussel-inspired chemistry to further combine with graphene oxide (GO) to wrap the Fe3O4@CFR spheres. The obtained Fe3O4@CFR and Fe3O4@CFR@GO nanospheres can be used as the effective catalyst supports of small Pd nanoparticles ( < 10 nm) formed via in-situ synthesis route...
November 30, 2018: ACS Applied Materials & Interfaces
Tianwei Xia, Fei Yu, Kaijia Zhang, Zongfang Wu, Dongquan Shi, Huajian Teng, Jirong Shen, Xianfeng Yang, Qing Jiang
Background: Intraarticular injection of the mesenchymal stem cells (MSCs) has shown to be successful for treating osteoarthritis (OA). Nevertheless, many studies have been focusing on autologous MSCs. The following study investigates the safety and effectiveness of intraarticular injection of allogenic MSCs in a pig OA model. Methods: Superparamagnetic iron oxide (SPIO) nanoparticles were labelled with bone marrow-derived mesenchymal stem cells (BM-MSCs) to allow cells tracking using magnetic resonance imaging (MRI)...
October 2018: Annals of Translational Medicine
Mohammad Mahdi Nejadi Babadaei, Mina Feli Moghaddam, Sara Solhvand, Ehsan Alizadehmollayaghoob, Farnoosh Attar, Elham Rajabbeigi, Keivan Akhtari, Soyar Sari, Mojtaba Falahati
Background: Implementations of nanoparticles have been receiving great interest in medicine and technology due to their unique characteristics. However, their toxic impacts on the biological system are not well explored. Aim: This study aims to investigate the influence of fabricated nano graphene oxide (NGO) sheets on the secondary and quaternary structural alterations of human hemoglobin (Hb) and cytotoxicity against lymphocyte cells. Materials and methods: Different spectroscopic methods, such as extrinsic and synchronous fluorescence spectroscopy and far circular dichroism (CD) spectroscopy, molecular docking investigation, cellular assays (trypan blue exclusion, cellular uptake, ROS, cell cycle, and apoptosis), and molecular assay (fold changes in anti/proapoptotic genes [B-cell lymphoma-2 { BCL2 }/ BAX ] expression levels) were used in this study...
2018: International Journal of Nanomedicine
Shuai Mao, Rui Bao, Dong Fang, Jianhong Yi
A composite photocatalyst, sliver/graphitic carbon nitride/pre-treated carbon fiber paper (Ag/g-C3 N4 /t-CFP), has been innovatively designed and successfully fabricated by loading Ag and g-C3 N4 species on t-CFP using the combined methods of thermal polymerization and improved electroless plating (IEP) through ultrasonic spray atomization (USA). A micro-droplet system, USA is able to eliminate the adverse influence of concentration gradient effectively. The samples obtained were carefully characterized in terms of morphology, phase, chemical structure, and optical performance...
November 22, 2018: Journal of Colloid and Interface Science
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