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Blue nanoparticles

Yifei Jiang, Jason McNeill
The performance of conjugated polymer devices is largely dictated by charge transport processes. However, it is difficult to obtain a clear relationship between conjugated polymer structures and charge transport properties, due to the complexity of the structure and the dispersive nature of charge transport in conjugated polymers. Here, we develop a method to map the energy landscape for charge transport in conjugated polymers based on simultaneous, correlated charge carrier tracking and single-particle fluorescence spectroscopy...
October 17, 2018: Nature Communications
Danfeng Jiang, Jun Pang, Qiannan You, Tao Liu, Zhenyu Chu, Wanqin Jin
A simultaneous testing of the trace catechol (CC) and hydroquinone (HQ) was achieved via an ultrasensitive phenolic biosensor constructed by the truncated cube-shaped gold/Prussian blue analogue (Au/PBA) nanocomposites. A facile charge-assembly strategy was developed to drive the successive mutual attractions for the crystallization among [Fe(CN)6 ]3- , Co2+ , and [AuCl4 ]- reactants, benefiting the in-situ growth of Au nanoparticles on all faces of the PBA truncated nanocubes. On account of this special architecture, numerous 10 nm Au particles can rapidly gather the electrons from the enzyme reaction to a PBA crystal due to their high conductivity, and then the current signals will be significantly magnified through the reversible redox of the PBA...
September 28, 2018: Biosensors & Bioelectronics
Jinli Qiu, Fuqiang Liu, Cailiang Yue, Chen Ling, Aimin Li
A novel nanosheet of Mo/N-codoped TiO2 nanorods immobilized on carbon nanofibers (MNTC nanosheet) was self-synthesized through two facile steps. The Mo/N-doped TiO2 nanorods dispersed through in situ growth on the network constructed by long and vertical carbon nanofibers (CNFs). The fabricated MNTC nanosheet displayed superb photocatalytic activity of methylene blue (MB), and the degradation ratio by the MNTC nanosheet was nearly twice than that of pure nanoparticles. The photocatalytic activities during the degradation process in the presence of environmental media such as inorganic salts and natural organic matter (NOM) were also determined...
October 8, 2018: Chemosphere
Md Manik Mian, Guijian Liu
Novel TiO2 /Fe/Fe3 C-biochar composite, as a heterogeneous catalyst, has been synthesized by a single-step route, where sewage sludge (SS) and different ratios of nanoparticles (NPs: Fe and Ti) impregnated with chitosan using coagulation and flocculation techniques for subsequent thermal decomposition at 800 °C. The physiochemical properties of samples have been characterized thoroughly and employed in methylene blue (MB) degradation tests. It was found that NPs ratio and chitosan support have significant influences on the properties and catalytic activity of catalysts...
October 6, 2018: Chemosphere
Shreyasi Asthana, Zaved Hazarika, Parth Sarathi Nayak, Jyoti Roy, Anupam Nath Jha, Bibekanand Mallick, Suman Jha
BACKGROUND: Injection localized amyloidosis is one of the most prevalent disorders in type II diabetes mellitus (TIIDM) patients relying of insulin injections. Previous studies have reported that nanoparticles can play a role in the amyloidogenic process of proteins. Hence, the present study deals with the effect of zinc oxide nanoparticles (ZnONP) on the amyloidogenicity and cytotoxicity of insulin. METHODS: ZnONP is synthesized and characterized using XRD, Zeta Sizer, UV-Visible spectroscope and TEM...
October 10, 2018: Biochimica et biophysica acta. General subjects
Elisangela P Da Silva, Manuel E G Winkler, Willyan M Giufrida, Lucio Cardozo-Filho, Christian G Alonso, Jardel B O Lopes, Adley F Rubira, Rafael Silva
Photocatalytic activity of TiO2 nanoparticles is highly dependent on their phase composition. The coexistence of anatase and rutile phases in a single nanoparticle eases the electron transfer process between the phases, and favors the separation of photogenerated pairs. In this work, highly photoactive mixed-phase TiO2 nanostructures were prepared by supercritical antisolvent precipitation (SAS), an environmentally friendly technology. It is shown here that this methodology has the remarkable ability to produce highly porous (515 m2 /g) and crystalline TiO2 nanoparticles...
September 29, 2018: Journal of Colloid and Interface Science
Piu Das, Sanjukta Ghosh, Raktim Ghosh, Somasri Dam, Moni Baskey
In current years, the development of efficient green methods for synthesis of metal oxide nanomaterials has attracted a great attention to the researchers since the plant-mediated synthesis is a cost-effective and a good alternative to chemical and physical methods. An efficient and eco-friendly route has been developed for the green synthesis of CuO nanoparticles (NPs) by Madhuca longifolia plant extract which acts as a non-toxic reducing agent. X-ray diffraction studies reveal the good crystallinity of the synthesized NPs and FTIR spectra confirm the synthesis of these NPs...
October 3, 2018: Journal of Photochemistry and Photobiology. B, Biology
Zhenxing Qin, Wenhai Wang, Xiaozhi Zhan, Xiujuan Du, Qingmei Zhang, Rui Zhang, Kun Li, Jinhong Li, Weiping Xu
Luminescent carbon-based nanoparticles, named often as carbon dots (CDs), were synthesized from citric acid (CA) and guanidine thiocyanate (GITC) via an N and S co-doped hydrothermal procedure. In the present structure characterization, N and S elements could be sufficiently doped by means of the heteroatom or the functional groups bonded on the surface of CDs. The as-prepared CDs solution showed blue color fluorescence under ultraviolet excitation, yet the PL spectra exhibited a repetitive emission process from excitation-independent to excitation-dependent...
October 4, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Peng-Ju Ye, Can Huang, Sa Yang, Pei Gao, Zhi-Ping Li, Si-Yue Tang, Ya Xiang, Yu-Feng Liu, Yu-Ping Chen, Dong-Xiu He, Cui-Yun Yu
Hepatocellular carcinoma (HCC) is one of the greatest public health problems worldwide, and chemotherapy remains the major approach for the HCC treatment. Doxorubicin (DOX) is one of the anthracycline antibiotics but its clinical use is limited due to its severe cardiotoxicity. In this study, novel hybrid nanoparticles by self-assembling based on pectin-doxorubicin conjugates (PDC-NPs) were fabricated for HCC treatment. The stabilized structure of the PDC-NPs was characterized by methylene blue absorption, the size, zeta potential and the morphology, which was investigated by Zetasizer nanoparticle analyzer and transmission electron microscope (TEM), of nanoparticles...
October 11, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Appan Roychoudhury, Suddhasatwa Basu, Sandeep Kumar Jha
An amperometric biosensor has been developed for highly efficient and sensitive detection of catechol using Prussian blue (PB)-coated nickel oxide (NiO) nanoparticles (NPs) as a matrix for the immobilization of tyrosinase enzyme. The NiO NPs were synthesized by sol-gel method using sodium dodecyl sulphate as anionic surfactant and the surface of the synthesized NiO NPs was modified with PB to enhance electrocatalytic activity and to prevent surface aggregation. After confirmation of successful synthesis of the PB-NiO NPs from transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopic (EDS) studies, the prepared NPs were deposited onto a working electrode of a commercially available screen printed carbon electrode (SPCE) substrate...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Dwiyantari Widyaningrum, Daisuke Iida, Yuma Tanabe, Yasuko Hayashi, Sari Dewi Kurniasih, Takeshi Ohama
Nanoparticles have unique properties that make them attractive for use in industrial and medical technology industries but can also be harmful to living organisms, making an understanding of their molecular mechanisms of action essential. We examined the effect of three different sized poly(isobutyl-cyanoacrylate) nanoparticles (iBCA-NPs) on the unicellular green alga Chlamydomonas reinhardtii. We found that exposure to iBCA-NPs immediately caused C. reinhardtii to display abnormal swimming behaviors. Furthermore, after one hour, most of the cells had stopped swimming and 10-30% of cells were stained with trypan blue, suggesting that these cells had severely impaired plasma membranes...
October 10, 2018: Journal of Phycology
Antonella Macagnano, Paolo Papa, Joshua Avossa, Viviana Perri, Marcello Marelli, Francesca Sprovieri, Emiliano Zampetti, Fabrizio De Cesare, Andrea Bearzotti, Nicola Pirrone
Passive sampling systems (PASs) are a low cost strategy to quantify Hg levels in air over both different environmental locations and time periods of few hours to weeks/months. For this reason, novel nanostructured materials have been designed and developed. They consist of an adsorbent layer made of titania nanoparticles (TiO₂NPs, ≤25 nm diameter) finely decorated with gold nanoparticles. The TiO₂NPs functionalization occurred for the photocatalytic properties of titania-anatase when UV-irradiated in an aqueous solution containing HAuCl₄...
October 7, 2018: Nanomaterials
Kanwal Iqbal, Anam Iqbal, Alexander M Kirillov, Weisheng Liu, Yu Tang
Nanoscale metal-organic frameworks (NMOFs) represent a unique class of solids with superior adsorption, mass transport, and catalytic properties. In this study, a facile and novel approach was developed for the generation of hybrid Cu-NMOF/Ce-doped-Mg-Al-LDH nanocatalyst through in situ self-assembly and solvothermal synthesis of a 2D Cu-NMOF, [Cu2 (μ-OH)(μ4 -btc)(phen)2 ] n ·5 nH2 O {H3 btc, trimesic acid; phen, 1,10-phenanthroline}, on a cerium-doped Mg-Al layered double hydroxide (Ce-doped-Mg-Al-LDH) matrix...
October 8, 2018: Inorganic Chemistry
Mirco Ponzoni, Flavio Curnis, Chiara Brignole, Silvia Bruno, Daniela Guarnieri, Leopoldo Sitia, Roberto Marotta, Angelina Sacchi, Matteo Bauckneht, Ambra Buschiazzo, Andrea Rossi, Daniela Di Paolo, Patrizia Perri, Alessandro Gori, Angela R Sementa, Laura Emionite, Michele Cilli, Roberto Tamma, Domenico Ribatti, Pier Paolo Pompa, Cecilia Marini, Gianmario Sambuceti, Angelo Corti, Fabio Pastorino
Targeted delivery of anticancer drugs with nanocarriers can reduce side effects and ameliorate therapeutic efficacy. However, poorly perfused and dysfunctional tumor vessels limit the transport of the payload into solid tumors. The use of tumor-penetrating nanocarriers might enhance tumor uptake and antitumor effects. A peptide containing a tissue-penetrating (TP) consensus motif, capable of recognizing neuropilin-1, is here fused to a neuroblastoma-targeting peptide (pep) previously developed. Neuroblastoma cell lines and cells derived from both xenografts and high-risk neuroblastoma patients show overexpression of neuropilin-1...
October 7, 2018: Small
Zhongju Ye, Rui Weng, Yanhong Ma, Fuyan Wang, Hua Liu, Lin Wei, Lehui Xiao
Rapid quantification of permanganate (MnO4 - ) in aqueous solution with a convenient and sensitive single-particle-detection (SPD) method is demonstrated by dark-field optical microscopy. The design is based on the selective etching of the Ag shell of a glucose-protected GNPs@Ag nanoparticle by MnO4 - . In the presence of MnO4 - , a noticeable red-shift of localized surface-plasmon resonance (LSPR, from blue to green) together with a tremendous decrease in the extinction coefficient from individual GNPs@Ag nanoparticles is observed...
October 17, 2018: Analytical Chemistry
Meng Wang, Xianwen Kan
In this study, an exfoliated graphite paper (EGP) was employed as a supported electrode for prussian blue (PB) and gold nanoparticles (AuNPs) modification to fabricate a novel electrochemical sensor. The scanning electron microscopy image showed the multilayer structure of the sensor with PB and AuNPs uniform coating. Due to the high surface area and good conductivity of the multilayer structure, as well as the conductivity of AuNPs, the prepared sensor exhibited an obvious improvement for sensitive detection of nicotinamide adenine dinucleotide (NADH) with a linear range of 5...
October 3, 2018: Analyst
Caiyun Kong, Linna Gao, Zhengbo Chen
An aptamer based assay is described for the colorimetric detection of adenosine. The presence of adenosine triggers the deformation of hairpin DNA oligonucleotide (HP1) containing adenosine aptamer and then hybridizes another unlabeled hairpin DNA oligonucleotide (HP2). This leads to the formation of a double strand with a blunt 3' terminal. After exonuclease III (Exo III)-assisted degradation, the guanine-rich strand (GRS) is released from HP2. Hence, the adenosine-HP1 complex is released to the solution where it can hybridize another HP2 and initiate many cycles of the digestion reaction with the assistance of Exo III...
October 2, 2018: Mikrochimica Acta
Qiuhong Min, Lei Zhao, Yushuang Qi, Jing Lei, Wenbo Chen, Xuhui Xu, Dacheng Zhou, Jianbei Qiu, Xue Yu
An amorphous layer acting as a quenching center at the surface of oleic acid-capped NaGdF4:Yb3+/Tm3+ nanoparticles is observed directly, which can be reconstructed via a novel post-chemical annealing process. The amorphous phase of the surface layer of NaGdF4:Yb3+/Tm3+ nanoparticles gradually crystallizes as the post-chemical annealing temperature increases; meanwhile, the good dispersibility of the as-obtained nanoparticles is maintained. The reduction of surface defects and higher local symmetry of the crystal field environment around the doped rare-earth ions contribute to drastically increased up-conversion (UC) emission intensity of the NaGdF4:Yb3+/Tm3+ nanoparticles...
October 18, 2018: Nanoscale
Zafar Khan Ghouri, Khaled Elsaid, Ahmed Abdala, Saeed Al-Meer, Nasser A M Barakat
In this study, hybrid graphene-Pt/TiO2 nanostructure were synthesized by single-step, inexpensive and surfactant/organic solvent free route; hydrothermal technique. The physicochemical properties of hybrid graphene-Pt/TiO2 nanostructure were carefully analyzed by multiple techniques, including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The synthesized hybrid nanostructures were utilized as photocatalyst for the degradation of methylene blue (MB) dye under natural environment at average ambient temperature and mean daily global solar radiation, of about 22-25 °C and 374...
October 2, 2018: Scientific Reports
Li Zou, Ruidi Shen, Liansheng Ling, Gongke Li
We developed a novel strategy for rapid colorimetric detection of specific DNA sequence based on gold nanoparticles assemblies induced by polymerase chain reaction (PCR) product. In the presence of target DNA, the two DNA-functionalized AuNP probes selectively hybridized with the prohibited nucleic acid segments of two primers owing to the zipping off of the hairpin structures during PCR process, resulted in the aggregation of AuNPs with a concomitant color change from red to blue-purple. It is a convenient and universal method for sensitive DNA detection with no need for any further post-treatment of the PCR products...
December 14, 2018: Analytica Chimica Acta
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