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Chenying Wang, Xidong Ren, Yujie Su, Yanjun Yang
Due to the poor thermal stability of egg white protein (EWP), important challenges remain regarding preparation of nanoparticles for EWP above the denaturation temperature at neutral conditions. In this study, nanoparticles were fabricated from conjugates of EWP and isomalto-oligosaccharide (IMO) after heating at 90 °C for 30 min. Meanwhile, the effects of protein concentration, temperature, pH, ionic strength and degree of glycation (DG) on the formation of nanoparticles from IMO-EWP were investigated. To further reveal the formation mechanism of the nanoparticles, structures, thermal denaturation properties and surface properties were compared between EWP and IMO-EWP conjugates...
November 15, 2018: Nanomaterials
Yanyan Xu, Huizhe Cao, Yanqin Xue, Biao Li, Weihua Cai
Graphene, a two-dimensional (2D) carbon nanomaterial, has attracted worldwide attention owing to its fascinating properties. One of critical bottlenecks on some important classes of applications, such as printed electronics, conductive coatings, and composite fillers, is the lack of industrial-scale methods to produce high-quality graphene in the form of liquid suspensions, inks, or dispersions. Since 2008, when liquid-phase exfoliation (LPE) of graphene via sonication was initiated, huge progress has been made in the past decade...
November 15, 2018: Nanomaterials
Mualla Öner, Gülnur Kızıl, Gülşah Keskin, Celine Pochat-Bohatier, Mikhael Bechelany
The thermal and mechanical properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV) composites filled with boron nitride (BN) particles with two different sizes and shapes were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), thermal gravimetric analysis (TGA) and mechanical testing. The biocomposites were produced by melt extrusion of PHBV with untreated BN and surface-treated BN particles...
November 15, 2018: Nanomaterials
Kentaro Yoshida, Tetsuya Ono, Takenori Dairaku, Yoshitomo Kashiwagi, Katsuhiko Sato
H₂O₂-sensitive nanofilms composed of DNA and hemin-appended poly(ethyleneimine) (H-PEI) were prepared by a layer-by-layer deposition of DNA and H-PEI through an electrostatic interaction. The (H-PEI/DNA)₅ film was decomposed by addition of 10 mM H₂O₂. H₂O₂-induced decomposition was also confirmed in the hemin-containing (PEI/DNA)₅ in which hemin molecules were adsorbed by a noncovalent bond to the nanofilm. On the other hand, the (PEI/DNA)₅ film containing no hemin and the (H-PEI/PSS)₅ film using PSS instead of DNA did not decompose even with 100 mM H₂O₂...
November 15, 2018: Nanomaterials
Lucas Freitas de Freitas, Gustavo Henrique Costa Varca, Jorge Gabriel Dos Santos Batista, Ademar Benévolo Lugão
At a nano-level, optical properties of gold are unique and gave birth to an emerging platform of nanogold-based systems for diverse applications, because gold nanoparticle properties are tunable as a function of size and shape. Within the available techniques for the synthesis of gold nanoparticles, the radiolytic synthesis allows proper control of the nucleation process without the need for reducing agents, in a single step, combined or not with simultaneous sterilization. This review details and summarizes the use of radiation technologies for the synthesis and preparation of gold nanoparticles concerning fundamental aspects, mechanism, current pathways for synthesis and radiation sources, as well as briefly outlines final applications and some toxicity aspects related to nanogold-based systems...
November 15, 2018: Nanomaterials
Fei Shen, Qianlong Kang, Jingjing Wang, Kai Guo, Qingfeng Zhou, Zhongyi Guo
Dielectric nanoresonantors may generate both electric and magnetic Mie resonances with low optical loss, thereby offering highly efficient paths for obtaining integrated optical devices. In this paper, we propose and design an optical filter with a high working efficiency in the mid-infrared (mid-IR) range, based on an all-dielectric metasurface composed of silicon (Si) nanodisk arrays. We numerically demonstrate that, by increasing the diameter of the Si nanodisk, the range of the proposed reflective optical filter could effectively cover a wide range of operation wavelengths, from 3...
November 14, 2018: Nanomaterials
Haiyan Yang, Liang Jiang, Yizhou Li, Guoqing Li, Yepeng Yang, Jiao He, Jiaqiang Wang, Zhiying Yan
In sharp contrast to conventional photosensitization methods in which the organic pigments were often adsorbed, herein we present a study on natural vegetable pigment inserted TiO₂ aerogel nanocomposites and we directly use red cabbage anthocyanin (RCP) as a structure-directing agent. It was found that pure TiO₂ aerogel nanocomposite did not exhibit any meaningful activity for photocatalytic reduction of Cr(VI). However, the photocatalytic reduction activity was greatly improved by the RCP inserted TiO₂ aerogel nanocomposites under visible-light irradiation, which was approximately 2- and 12...
November 14, 2018: Nanomaterials
Wei-Kai Wang, Yu-Xiu Lin, Yi-Jie Xu
Yttrium fluoride (YF₃) films were grown on sapphire substrate by a radio frequency magnetron using a commercial ceramic target in a vacuum chamber. The structure, composition, and plasma etching behavior of the films were systematically investigated. The YF₃ film was deposited at a working pressure of 5 mTorr and an RF power of 150 W. The substrate-heating temperature was increased from 400 to 700 °C in increments of 100 °C. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction results confirmed an orthorhombic YF₃ structure was obtained at a substrate temperature of 700 °C for 2 h...
November 14, 2018: Nanomaterials
Paola Sánchez-Moreno, Juan de Vicente, Stefania Nardecchia, Juan A Marchal, Houria Boulaiz
Progress in nanotechnology has enabled us to open many new fronts in biomedical research by exploiting the peculiar properties of materials at the nanoscale. The thermal sensitivity of certain materials is a highly valuable property because it can be exploited in many promising applications, such as thermo-sensitive drug or gene delivery systems, thermotherapy, thermal biosensors, imaging, and diagnosis. This review focuses on recent advances in thermo-sensitive nanomaterials of interest in biomedical applications...
November 13, 2018: Nanomaterials
John Paolo L Lazarte, Regine Clarisse Dipasupil, Gweneth Ysabelle S Pasco, Ramon Christian P Eusebio, Aileen H Orbecido, Ruey-An Doong, Liza Bautista-Patacsil
Composites of synthesized reduced graphene oxide (rGO) and titanium dioxide nanotubes (TNTs) were examined and combined at different mass proportions (3:1, 1:1, and 1:3) to develop an electrochemical double layer capacitor (EDLC) nanocomposite. Three different combination methods of synthesis-(1) TNT introduction during GO reduction, (2) rGO introduction during TNT formation, and (3) TNT introduction in rGO sheets using a microwave reactor-were used to produce nanocomposites. Among the three methods, method 3 yielded an EDLC nanomaterial with a highly rectangular cyclic voltammogram and steep electrochemical impedance spectroscopy plot...
November 9, 2018: Nanomaterials
Sylvie Ribeiro, Tânia Ribeiro, Clarisse Ribeiro, Daniela M Correia, José P Sequeira Farinha, Andreia Castro Gomes, Carlos Baleizão, Senentxu Lanceros-Méndez
Poly(vinylidene fluoride) nanocomposites processed with different morphologies, such as porous and non-porous films and fibres, have been prepared with silica nanoparticles (SiNPs) of varying diameter (17, 100, 160 and 300 nm), which in turn have encapsulated perylenediimide (PDI), a fluorescent molecule. The structural, morphological, optical, thermal, and mechanical properties of the nanocomposites, with SiNP filler concentration up to 16 wt %, were evaluated. Furthermore, cytotoxicity and cell proliferation studies were performed...
November 9, 2018: Nanomaterials
Siyuan Li, Yan Yang, Xiangjun Zha, Yicun Zhou, Wei Yang, Mingbo Yang
Nanostructured polyamide 12(PA12)/polyketone (PK) blends were fabricated by melt compounding. The nanoscale droplet and domain-in-domain morphologies depending on PK content were observed. When the content of PK was 10 vol%, the impact strength of the blend jumps from 6.8 to 111.9 kJ/m² and further improved with an increasing content of PK. The toughening mechanism was found to be closely related with the morphology change from nanoscale droplet morphology to domain-in-domain morphology owing to the strong interfacial hydrogen bonding...
November 8, 2018: Nanomaterials
Kyriaki Polychronopoulou, Nikolaos Charisiou, Kyriakos Papageridis, Victor Sebastian, Steven Hinder, Aasif Dabbawala, Ayesha AlKhoori, Mark Baker, Maria Goula
In the present study, Ni/Ce-Sm-xCu (x = 5, 7, 10 at.%) catalysts were prepared using microwave radiation coupled with sol-gel and followed by wetness impregnation method for the Ni incorporation. Highly dispersed nanocrystallites of CuO and NiO on the Ce-Sm-Cu support were found. Increase of Cu content seems to facilitate the reducibility of the catalyst according to the H₂ temperature-programmed reduction (H₂-TPR). All the catalysts had a variety of weak, medium and strong acid/basic sites that regulate the reaction products...
November 8, 2018: Nanomaterials
Siying Tang, Zhe Wang, Penghui Li, Wan Li, Chengyong Li, Yi Wang, Paul K Chu
A degradable and antibacterial sodium alginate film containing functional Au-TiO₂ nanocomposites for food packaging was successfully developed. The Au-TiO₂ nanocomposites are synthesized hydrothermally and mixed with the alginate solution to form the film by a casting method. The Au-TiO₂ nanocomposites enable the film with excellent visible light absorption and transfer ability with the light absorption rang covering UV⁻visible wavelength (300⁻800 nm) and induce the increase of the film water contact angle from 40° to 74°, which contributes to the film shape stability...
November 8, 2018: Nanomaterials
Sajjad Hussain, Kamran Akbar, Dhanasekaran Vikraman, Rana Arslan Afzal, Wooseok Song, Ki-Seok An, Ayesha Farooq, Jun-Young Park, Seung-Hyun Chun, Jongwan Jung
To find an effective alternative to scarce, high-cost noble platinum (Pt) electrocatalyst for hydrogen evolution reaction (HER), researchers are pursuing inexpensive and highly efficient materials as an electrocatalyst for large scale practical application. Layered transition metal dichalcogenides (TMDCs) are promising candidates for durable HER catalysts due to their cost-effective, highly active edges and Earth-abundant elements to replace Pt electrocatalysts. Herein, we design an active, stable earth-abundant TMDCs based catalyst, WS(1- x ) Se x nanoparticles-decorated onto a 3D porous graphene/Ni foam...
November 8, 2018: Nanomaterials
Sayed M Riyadh, Khaled D Khalil, Ateyatallah Aljuhani
A chitosan-MgO hybrid nanocomposite was prepared using a simple chemical precipitation method and characterized using Fourier transform spectroscopy (FTIR), elemental analysis (EDX), and scanning electron microscopy (SEM). The nanocomposite was served as a powerful ecofriendly basic catalyst under microwave irradiation in the synthesis of two novel series of 5-arylazo-2-hydrazonothiazoles 4a ⁻ j and 2-hydrazono[1,3,4]thiadiazoles 8a ⁻ d , incorporating a sulfonamide group. The structures of the synthesized products were elucidated by spectral data and elemental analyses...
November 8, 2018: Nanomaterials
Allison Rick VandeVoort, Yuji Arai
The potential agricultural use of metal nanoparticles (NPs) for slow-release micronutrient fertilizers is beginning to be investigated by both industry and regulatory agencies. However, the impact of such NPs on soil biogeochemical cycles is not clearly understood. In this study, the impact of commercially-available copper NPs on soil nitrification kinetics was investigated via batch experiments. The X-ray absorption near edge structure spectroscopy analysis showed that the NPs readily oxidized to Cu(II) and were strongly retained in soils with minimum dissolution (<1% of total mass)...
November 8, 2018: Nanomaterials
Stefano Caimi, Antoine Klaue, Hua Wu, Massimo Morbidelli
Safety concerns related to the use of potentially explosive, liquid organic electrolytes in commercial high-power lithium-ion batteries are constantly rising. One promising alternative is to use thermally stable ionic liquids (ILs) as conductive media, which are however, limited by low ionic conductivity at room temperature. This can be improved by adding fillers, such as silica or alumina nanoparticles (NPs), in the polymer matrix that hosts the IL. To maximize the effect of such NPs, they have to be uniformly dispersed in the matrix while keeping their size as small as possible...
November 8, 2018: Nanomaterials
Yushen Lu, Wenkai Dong, Wenbo Wang, Junjie Ding, Qin Wang, Aiping Hui, Aiqin Wang
A series of environment-friendly clay minerals-α-Fe₂O₃ iron-red hybrid pigments-were prepared by a simple one-step hydrothermal reaction process using natural nanostructured silicate clay minerals as starting materials. The influence of structure, morphology and composition of different clay minerals on the structure, color properties, and stability of the pigments was studied comparatively by systematic structure characterizations with X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmittance electron microscope (TEM), X-ray fluorescence spectroscopy (XRF), X-ray photoelectron spectroscopy (XPS) and CIE- L*a*b* Colorimetric analyses...
November 8, 2018: Nanomaterials
Hsin-Ya Chiu, Chun-Pei Cho
MnO₂/N-containing graphene composites with various contents of Mn were fabricated and used as active materials for the electrodes of flexible solid-state asymmetric supercapacitors. By scanning electron microscopes (SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectrometer (XPS), fourier-transform infrared spectroscopy (FTIR) and Raman spectra, the presence of MnO₂ and N-containing graphene was verified. The MnO₂ nanostructures decorated on the N-containing graphene were of α- and γ-mixed phases...
November 8, 2018: Nanomaterials
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