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Nanomaterials 51건

  1. [해외논문]   Strongly Iridescent Hybrid Photonic Sensors Based on Self-Assembled Nanoparticles for Hazardous Solvent Detection   SCIE

    Sato, Ayaka , Ikeda, Yuya , Yamaguchi, Koichi , Vohra, Varun
    Nanomaterials v.8 no.3 ,pp. 169 , 2018 ,

    초록

    Facile detection and the identification of hazardous organic solvents are essential for ensuring global safety and avoiding harm to the environment caused by industrial wastes. Here, we present a simple method for the fabrication of silver-coated monodisperse polystyrene nanoparticle photonic structures that are embedded into a polydimethylsiloxane (PDMS) matrix. These hybrid materials exhibit a strong green iridescence with a reflectance peak at 550 nm that originates from the close-packed arrangement of the nanoparticles. This reflectance peak measured under Wulff-Bragg conditions displays a 20 to 50 nm red shift when the photonic sensors are exposed to five commonly employed and highly hazardous organic solvents. These red-shifts correlate well with PDMS swelling ratios using the various solvents, which suggests that the observable color variations result from an increase in the photonic crystal lattice parameter with a similar mechanism to the color modulation of the chameleon skin. Dynamic reflectance measurements enable the possibility of clearly identifying each of the tested solvents. Furthermore, as small amounts of hazardous solvents such as tetrahydrofuran can be detected even when mixed with water, the nanostructured solvent sensors we introduce here could have a major impact on global safety measures as innovative photonic technology for easily visualizing and identifying the presence of contaminants in water.

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  2. [해외논문]   Cyclodextrin-Based Magnetic Nanoparticles for Cancer Therapy   SCIE

    Mró (NanoBioMedical Centre, Adam Mickiewicz University in Poznan, Umultowska 85, PL-61614 Poznan, Poland) , wczyń (artur.jedrzak@gmail.com (A.J.)) , ski, Radosław (bartoszg@amu.edu.pl (B.F.G.)) , Ję (coyeme@amu.edu.pl (E.C.)) , drzak, Artur (rokmar@amu.edu.pl (Ro.M.)) , Szutkowski, Kosma (stjurga@amu.edu.pl (S.J.) ) , Grześ (NanoBioMedical Centre, Adam Mickiewicz University in Poznan, Umultowska 85, PL-61614 Poznan, Poland) , kowiak, Bartosz F. (artur.jedrzak@gmail.com (A.J.)) , Coy, Emerson (bartoszg@amu.edu.pl (B.F.G.)) , Markiewicz, Roksana (coyeme@amu.edu.pl (E.C.)) , Jesionowski, Teofil (rokmar@amu.edu.pl (Ro.M.)) , Jurga, Stefan (stjurga@amu.edu.pl (S.J.) )
    Nanomaterials v.8 no.3 ,pp. 170 , 2018 ,

    초록

    Polydopamine (PDA)-coated magnetic nanoparticles functionalized with mono-6-thio-β-cyclodextrin (SH-βCD) were obtained and characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Nuclear and Magnetic Resonance Imaging (NMR and MRI), and doxorubicin (DOXO)-loading experiments. The liver cancer cellular internalization of DOXO-loaded nanoparticles was investigated by confocal imaging microscopy. Synthesized nanomaterials bearing a chemotherapeutic drug and a layer of polydopamine capable of absorbing near-infrared light show high performance in the combined chemo- and photothermal therapy (CT-PTT) of liver cancer due to the synergistic effect of both modalities as demonstrated in vitro. Moreover, our material exhibits improved T 2 contrast properties, which have been verified using Carr-Purcell-Meiboom-Gill pulse sequence and MRI Spin-Echo imaging of the nanoparticles dispersed in the agarose gel phantoms. Therefore, the presented results cast new light on the preparation of polydopamine-based magnetic theranostic nanomaterials, as well as on the proper methodology for investigation of magnetic nanoparticles in high field MRI experiments. The prepared material is a robust theranostic nanoasystem with great potential in nanomedicine.

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  3. [해외논문]   Preparation, Modification, Characterization, and Biosensing Application of Nanoporous Gold Using Electrochemical Techniques   SCIE

    Bhattarai, Jay K. , Neupane, Dharmendra , Nepal, Bishal , Mikhaylov, Vasilii , Demchenko, Alexei V. , Stine, Keith J.
    Nanomaterials v.8 no.3 ,pp. 171 , 2018 ,

    초록

    Nanoporous gold (np-Au), because of its high surface area-to-volume ratio, excellent conductivity, chemical inertness, physical stability, biocompatibility, easily tunable pores, and plasmonic properties, has attracted much interested in the field of nanotechnology. It has promising applications in the fields of catalysis, bio/chemical sensing, drug delivery, biomolecules separation and purification, fuel cell development, surface-chemistry-driven actuation, and supercapacitor design. Many chemical and electrochemical procedures are known for the preparation of np-Au. Recently, researchers are focusing on easier and controlled ways to tune the pores and ligaments size of np-Au for its use in different applications. Electrochemical methods have good control over fine-tuning pore and ligament sizes. The np-Au electrodes that are prepared using electrochemical techniques are robust and are easier to handle for their use in electrochemical biosensing. Here, we review different electrochemical strategies for the preparation, post-modification, and characterization of np-Au along with the synergistic use of both electrochemistry and np-Au for applications in biosensing.

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  4. [해외논문]   Investigation on the Stability of Derivative Melam from Melamine Pyrolysis under High Pressure   SCIE

    Yuan, Xiaohong (State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China) , Luo, Kun (xhyuan_future@163.com (X.Y.)) , Wu, Yingju (hiluokun@gmail.com (K.L.)) , He, Julong (wuyingjv@163.com (Y.W.)) , Zhao, Zhisheng (hjl@ysu.edu.cn (J.H.) ) , Yu, Dongli (State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China)
    Nanomaterials v.8 no.3 ,pp. 172 , 2018 ,

    초록

    Although various kinds of carbon nitride precursors have been proposed, s-triazine-based structures are hardly reported because of their unfavorable energy, higher than that of heptazine-based ones. In this study, we investigate the thermal stability of s-triazine-based melam processed at a high pressure of 5 GPa and a temperature of 400–700 °C and complete the analyses of the composition and structure of the treated samples through X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and elemental analyses (EA). Results show that melam can stably exist up to 600 °C at 5 GPa. XRD and FTIR analyses reveal that residual melamine can be pyrolyzed into melam as temperature increases from 400 °C to 600 °C at a high pressure, suggesting that melam may be purified through high-pressure pyrolysis. Further melam polymerization at a higher pressure is a promising strategy for the preparation of s-triazine-based carbon nitride precursors used for bulk carbon nitride synthesis.

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  5. [해외논문]   The Adsorption of Dextranase onto Mg/Fe-Layered Double Hydroxide: Insight into the Immobilization   SCIE

    Ding, Yi (College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang 222005, China) , Liu, Le (leonardoding@sina.com (Y.D.)) , Fang, Yaowei (liulezz3@163.com (L.L.)) , Zhang, Xu (foroei@163.com (Y.F.) ) , Lyu, Mingsheng (College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang 222005, China) , Wang, Shujun (leonardoding@sina.com (Y.D.))
    Nanomaterials v.8 no.3 ,pp. 173 , 2018 ,

    초록

    We report the adsorption of dextranase on a Mg/Fe-layered double hydroxide (Mg/Fe-LDH). We focused the effects of different buffers, pH, and amino acids. The Mg/Fe-LDH was synthesized, and adsorption experiments were performed to investigate the effects. The maximum adsorption occurred in pH 7.0 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) buffer, and the maximum dextranase adsorption uptake was 1.38 mg/g (416.67 U/mg); histidine and phenylalanine could affect the adsorption. A histidine tag could be added to the protein to increase the adsorption significantly. The performance features and mechanism were investigated with X-ray diffraction patterns (XRD) and Fourier transform infrared spectra (FTIR). The protein could affect the crystal structure of LDH, and the enzyme was adsorbed on the LDH surface. The main interactions between the protein and LDH were electrostatic and hydrophobic. Histidine and phenylalanine could significantly affect the adsorption. The hexagonal morphology of LDH was not affected after adsorption.

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  6. [해외논문]   Synthesis of Gold Nanoparticles Using Leaf Extract of Ziziphus zizyphus and their Antimicrobial Activity   SCIE

    Aljabali, Alaa A. A. (Faculty of Pharmacy, Yarmouk University, P.O.BOX 566, Irbid 21163, Jordan) , Akkam, Yazan (yazan.a@yu.edu.jo (Y.A.)) , Al Zoubi, Mazhar Salim (osama.yousef@yu.edu.jo (O.A.A.) ) , Al-Batayneh, Khalid M. (Faculty of Pharmacy, Yarmouk University, P.O.BOX 566, Irbid 21163, Jordan) , Al-Trad, Bahaa (yazan.a@yu.edu.jo (Y.A.)) , Abo Alrob, Osama (osama.yousef@yu.edu.jo (O.A.A.) ) , Alkilany, Alaaldin M. (Department of Basic Medical Sciences, Faculty of Medicine, Yarmouk University, Irbid 21163, Jordan) , Benamara, Mourad (mszoubi@yu.edu.jo ) , Evans, David J. (Department of Biological Science, Yarmouk University, P.O.BOX 566, Irbid 21163, Jordan)
    Nanomaterials v.8 no.3 ,pp. 174 , 2018 ,

    초록

    (1) Background: There is a growing need for the development of new methods for the synthesis of nanoparticles. The interest in such particles has raised concerns about the environmental safety of their production methods; (2) Objectives: The current methods of nanoparticle production are often expensive and employ chemicals that are potentially harmful to the environment, which calls for the development of “greener” protocols. Herein we describe the synthesis of gold nanoparticles (AuNPs) using plant extracts, which offers an alternative, efficient, inexpensive, and environmentally friendly method to produce well-defined geometries of nanoparticles; (3) Methods: The phytochemicals present in the aqueous leaf extract acted as an effective reducing agent. The generated AuNPs were characterized by Transmission electron microscopy (TEM), Scanning electron microscope (SEM), and Atomic Force microscopy (AFM), X-ray diffraction (XRD), UV-visible spectroscopy, energy dispersive X-ray (EDX), and thermogravimetric analyses (TGA); (4) Results and Conclusions: The prepared nanoparticles were found to be biocompatible and exhibited no antimicrobial or antifungal effect, deeming the particles safe for various applications in nanomedicine. TGA analysis revealed that biomolecules, which were present in the plant extract, capped the nanoparticles and acted as stabilizing agents.

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  7. [해외논문]   Plasmonic Absorption Enhancement in Elliptical Graphene Arrays   SCIE

    Chen, Jiajia (School of Science, Southwest University of Science and Technology, Mianyang 621010, China) , Zeng, Yu (chenjiajia522@outlook.com (J.C.)) , Xu, Xibin (yuzeng7@hotmail.com (Y.Z.)) , Chen, Xifang (chenxifang1987@swust.edu.cn (X.C.)) , Zhou, Zigang (zhouzigang@swust.edu.cn (Z.Z.)) , Shi, Pengcheng (shi623672967@outlook.com (P.S.) ) , Yi, Zao (School of Science, Southwest University of Science and Technology, Mianyang 621010, China) , Ye, Xin (chenjiajia522@outlook.com (J.C.)) , Xiao, Shuyuan (yuzeng7@hotmail.com (Y.Z.)) , Yi, Yougen (chenxifang1987@swust.edu.cn (X.C.))
    Nanomaterials v.8 no.3 ,pp. 175 , 2018 ,

    초록

    In this paper, we come up with a wavelength tunable absorber which is made up of periodically elliptical graphene arrays in the far-infrared and terahertz regions. Through simulation, we find that we can increase the length of long axis of the ellipse, raise the incidence angles of TM- and TE-polarization (TM- and TE-polarization indicate the direction of the incident electric field along the direction of the x and the y axis, respectively.) within certain limits, and increase the chemical potential of graphene, so as to enhance the absorption of light in the elliptical graphene arrays. We also compare the absorption spectra of the original structure and the complementary structure, and find that the absorption of the original structure is higher than that of the complementary structure. In the end, we study the changes in the absorption rate of the double layer structure of the elliptical array with the increase in the thickness of SiO 2 . The elliptical array structure can be applied to tunable spectral detectors, filters and sensors at far-infrared and terahertz wavelengths.

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  8. [해외논문]   Comparison of Branched and Linear Perfluoropolyether Chains Functionalization on Hydrophobic, Morphological and Conductive Properties of Multi-Walled Carbon Nanotubes   SCIE

    Sansotera, Maurizio (Dipartimento di Chimica, Materiali e Ingegneria Chimica, Politecnico di Milano, via Mancinelli 7, I-20131 Milano, Italy) , Talaeemashhadi, Sadaf (sadaf.talaeemashhadi@chem.polimi.it (S.T.)) , Gambarotti, Cristian (cristian.gambarotti@polimi.it (C.G.)) , Pirola, Carlo (walter.navarrini@polimi.it (W.N.) ) , Longhi, Mariangela (Dipartimento di Chimica, Materiali e Ingegneria Chimica, Politecnico di Milano, via Mancinelli 7, I-20131 Milano, Italy) , Ortenzi, Marco A. (sadaf.talaeemashhadi@chem.polimi.it (S.T.)) , Navarrini, Walter (cristian.gambarotti@polimi.it (C.G.)) , Bianchi, Claudia L. (walter.navarrini@polimi.it (W.N.) )
    Nanomaterials v.8 no.3 ,pp. 176 , 2018 ,

    초록

    The functionalization of multi-walled carbon nanotubes (MW-CNTs) was obtained by generating reactive perfluoropolyether (PFPE) radicals that can covalently bond to MW-CNTs' surface. Branched and linear PFPE peroxides with equivalent molecular weights of 1275 and 1200 amu, respectively, have been thermally decomposed for the production of PFPE radicals. The functionalization with PFPE chains has changed the wettability of MW-CNTs, which switched their behavior from hydrophilic to super-hydrophobic. The low surface energy properties of PFPEs have been transferred to MW-CNTs surface and branched units with trifluoromethyl groups, CF 3 , have conferred higher hydrophobicity than linear units. Porosimetry discriminated the effects of PFPE functionalization on meso-porosity and macro-porosity. It has been observed that reactive sites located in MW-CNTs mesopores have been intensively functionalized by branched PFPE peroxide due to its low average molecular weight. Conductivity measurements at different applied pressures have showed that the covalent linkage of PFPE chains, branched as well as linear, weakly modified the electrical conductivity of MW-CNTs. The decomposed portions of PFPE residues, the PFPE chains bonded on carbon nanotubes, and the PFPE fluids obtained by homo-coupling side-reactions were evaluated by mass balances. PFPE-modified MW-CNTs have been characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), static contact angle (SCA), surface area, and porosity measurements.

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  9. [해외논문]   TiO 2 -SiO 2 Coatings with a Low Content of AuNPs for Producing Self-Cleaning Building Materials   SCIE

    Luna, Manuel (TEP-243 Nanomaterials Group, Department of Physical-Chemistry, Faculty of Sciences, University of Cadiz, 11510 Puerto Real, Spain) , Delgado, Juan J. (manuel.luna@uca.es (M.L.)) , Gil, M. L. Almoraima (almoraima.gil@uca.es (M.L.A.G.) ) , Mosquera, Marí (Department of Inorganic Chemistry, CASEM, University of Cadiz, 11510 Puerto Real, Spain) , a J. (juanjose.delgado@uca.es )
    Nanomaterials v.8 no.3 ,pp. 177 , 2018 ,

    초록

    The high pollution levels in our cities are producing a significant increase of dust on buildings. An application of photoactive coatings on building materials can produce buildings with self-cleaning surfaces. In this study, we have developed a simple sol-gel route for producing Au-TiO 2 /SiO 2 photocatalysts with application on buildings. The gold nanoparticles (AuNPs) improved the TiO 2 photoactivity under solar radiation because they promoted absorption in the visible range. We varied the content of AuNPs in the sols under study, in order to investigate their effect on self-cleaning properties. The sols obtained were sprayed on a common building stone, producing coatings which adhere firmly to the stone and preserve their aesthetic qualities. We studied the decolourization efficiency of the photocatalysts under study against methylene blue and against soot (a real staining agent for buildings). Finally, we established that the coating with an intermediate Au content presented the best self-cleaning performance, due to the role played by its structure and texture on its photoactivity.

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  10. [해외논문]   Transferrin Functionalized Liposomes Loading Dopamine HCl: Development and Permeability Studies across an In Vitro Model of Human Blood–Brain Barrier   SCIE

    Lopalco, Antonio , Cutrignelli, Annalisa , Denora, Nunzio , Lopedota, Angela , Franco, Massimo , Laquintana, Valentino
    Nanomaterials v.8 no.3 ,pp. 178 , 2018 ,

    초록

    The high pollution levels in our cities are producing a significant increase of dust on buildings. An application of photoactive coatings on building materials can produce buildings with self-cleaning surfaces. In this study, we have developed a simple sol-gel route for producing Au-TiO 2 /SiO 2 photocatalysts with application on buildings. The gold nanoparticles (AuNPs) improved the TiO 2 photoactivity under solar radiation because they promoted absorption in the visible range. We varied the content of AuNPs in the sols under study, in order to investigate their effect on self-cleaning properties. The sols obtained were sprayed on a common building stone, producing coatings which adhere firmly to the stone and preserve their aesthetic qualities. We studied the decolourization efficiency of the photocatalysts under study against methylene blue and against soot (a real staining agent for buildings). Finally, we established that the coating with an intermediate Au content presented the best self-cleaning performance, due to the role played by its structure and texture on its photoactivity.

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