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Lulu Xu, Ye Xiong, Baokang Dang, Chao Wang, Chunde Jin, Qingfeng Sun, Xiaochun Zhang
In this work, we provide a novel strategy of constructing different micro-nano structure (arrayed, multilevel, flower-like) titanate nanotubes (TNTs) networks with cellulose sheets as structure promoter. Through cellulose self-locking and inter-locking, several micro-nano TNTs networks with higher specific surface area are obtained and applied to toxic heavy metal Pb(2+) cations removal. It not only makes abundant toxic Pb(2+) ions exchange with the inter-layer Na(+) ions of TNTs, but also allows many Pb(2+) ions to be deposited onto the TNTs surface...
November 1, 2017: Carbohydrate Polymers
Hailing Sun, Xiao Wu, Dengfeng Peng, K W Kwok
Ferroelectric oxides with luminescent ions hold great promise in future optoelectronic devices because of their unique photoluminescence and inherent ferroelectric properties. Intriguingly, the photoluminescence performance of ferroelectric ceramics could be modulated by an external electric field. However, researchers face a current challenge of the diminutive extent and degree of reversibility of the field-driven modification that hinder their use in room temperature practical applications. Within the scope of current contribution in rare-earth doped bismuth sodium titanate relaxors, the most important information to be noted is the shifting of the depolarization temperature towards room temperature and the resulting considerable enhancement in ergodicity, as evidenced by the dielectric properties, polarization and strain hysteresis, as well as the in-situ Raman/ X-ray diffraction studies...
September 13, 2017: ACS Applied Materials & Interfaces
Aleksander Matavž, Vid Bobnar, Barbara Malic
The surface properties of a substrate are among the most important parameters in the printing technology of functional materials, determining not only the printing resolution but also the stability of the printed features. This paper addresses the wetting difficulties encountered during inkjet printing on homogeneous substrates as a result of improper surface properties. We show that the wetting of a substrate and, consequently, the quality of the printed pattern, can be mediated through the deposition of polymeric layers that are a few nanometers thick...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Yuki Sakaguchi, Tomoka Minamikawa, Mayuko Yamamuro, Tadayuki Tsujita, Toshihisa Ueda, Kai Kamada, Nobuaki Soh
Luminescent europium-doped layered titanates (Eu-TiOx) were synthesized and complexed with horseradish peroxidase (HRP) and glucose oxidase (GOx). The emission of a resultant Eu-TiOx/HRP/GOx complex decreased upon the addition of glucose in the presence of guaiacol. The emission decrease was dependent on the concentrations of glucose, and the detection limit for glucose was 3.1 μM. The proposed system would be promising as a new detection method for glucose.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Kui Yao, Shuting Chen, Kun Guo, Chee Kiang Ivan Tan, Meysam Sharifzadeh Mirshekarloo, Francis Eng Hock Tay
The paper starts from a review on the progress in fabrication of piezoelectric ceramic coatings by thermal spray method. For our experimental work, two types of lead-free piezoelectric ceramic coatings, including potassium sodium niobate (KNN)-based and bismuth sodium titanate (BNT)-based, are fabricated by thermal spray process, and their structure, morphology and piezoelectric properties are characterized. Our obtained lead-free ceramic coatings exhibit single phase of perovskite structure, relatively dense morphology, and competitive piezoelectric coefficients...
September 4, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
M T B Clabbers, E van Genderen, W Wan, E L Wiegers, T Gruene, J P Abrahams
Three-dimensional nanometre-sized crystals of macromolecules currently resist structure elucidation by single-crystal X-ray crystallography. Here, a single nanocrystal with a diffracting volume of only 0.14 µm(3), i.e. no more than 6 × 10(5) unit cells, provided sufficient information to determine the structure of a rare dimeric polymorph of hen egg-white lysozyme by electron crystallography. This is at least an order of magnitude smaller than was previously possible. The molecular-replacement solution, based on a monomeric polyalanine model, provided sufficient phasing power to show side-chain density, and automated model building was used to reconstruct the side chains...
September 1, 2017: Acta Crystallographica. Section D, Structural Biology
Asya Ozkizilcik, Aruna Sharma, Dafin F Muresanu, José V Lafuente, Z Ryan Tian, Ranjana Patnaik, Herbert Mössler, Hari S Sharma
Previous studies from our laboratory show that intraperitoneal injections of 1-metyl-4-phenyl-1,2,3,6-tetrahydropyridin (MPTP, 20 mg/kg) daily within 2-h intervals for 5 days in mice induce Parkinson's disease (PD)-like symptoms on the 8th day. A significant decrease in dopamine (DA) and its metabolites 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) along with a marked decrease in the number of tyrosine hydroxylase (TH)-positive cells in the substantia nigra pars compacta (SNpc) and striatum (STr) confirms the validity of this model for studying PD...
September 5, 2017: Molecular Neurobiology
Hsueh-Chuan Hsu, Shih-Ching Wu, Shih-Kuang Hsu, Yi-Hang Liao, Wen-Fu Ho
BACKGROUND: As titanium (Ti) alloys are bioinert, various chemically-modified Ti surface has been developed to promote bioactivity and bone ingrowth. OBJECTIVE: In this study, various post treatments (water aging, hydrothermal, and heat treatments) were applied to NaOH-treated Ti-5Si to improve its bioactivity. METHODS: The bioactivity of surface-modified Ti-5Si was access by using the apatite formation ability of Ti-5Si surfaces soaking in a simulated body fluid (SBF)...
2017: Bio-medical Materials and Engineering
Laxman Singh, Uday Pratap Azad, Satendra Pal Singh, Vellaichamy Ganesan, U S Rai, Youngil Lee
Replacing platinum (Pt) metal-based electrocatalysts used in the oxygen reduction reaction (ORR) in fuel cells is an important research topic due to the high cost and scarcity of Pt, which have restricted the commercialization of these clean-energy technologies. The ABO3-type perovskite family of an ACu3Ti4O12 (A = Ca, Y, Bi, and La) polycrystalline material can serve as an alternative electrocatalyst for the ORR in terms of low-cost, activity, and stability. These perovskite materials may be considered the next generation electro-catalyst for the ORR because of their photocatalytic activity and physical and chemical properties capable of containing a wide range of A- and B-site metals...
August 24, 2017: Scientific Reports
F A Vasconcelos, S Pilling, W R M Rocha, H Rothard, P Boduch
In order to investigate the role of medium mass cosmic rays and energetic solar particles in the processing of N2-rich ice on frozen moons and cold objects in the outer solar system, the bombardment of an N2 : H2O : NH3 : CO2 (98.2 : 1.5 : 0.2 : 0.1) ice mixture at 16 K employing 15.7 MeV (16)O(5+) was performed. The changes in the ice chemistry were monitored and quantified by Fourier transformed infrared spectroscopy (FTIR). The results indicate the formation of azide radicals (N3), and nitrogen oxides, such as NO, NO2, and N2O, as well as the production of CO, HNCO, and OCN(-)...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
Moumita Dutta, Kamaraju Natarajan, Soutik Betal, Rohit P Prasankumar, Amar S Bhalla, Ruyan Guo
Magnetoelastoelectric coupling in an engineered biphasic multiferroic nanocomposite enables a novel magnetic field direction-defined propagation control of terahertz (THz) waves. These core-shell nanoparticles are comprised of a ferromagnetic cobalt ferrite core and a ferroelectric barium titanate shell. An assembly of these nanoparticles, when operated in external magnetic fields, exhibits a controllable amplitude modulation when the magnetic field is applied antiparallel to the THz wave propagation direction; yet the same assembly displays an additional phase modulation when the magnetic field is applied along the propagation direction...
September 14, 2017: Nanoscale
Jie-Su Wang, Kui-Juan Jin, Jun-Xing Gu, Qian Wan, Hong-Bao Yao, Guo-Zhen Yang
For ferroelectric materials, where the polar state breaks the inversion symmetry, second harmonic generation is a useful tool to prove their ferroelectric properties. However, the correlation between the anisotropy patterns and the polarization orientation of the ferroelectric domains has not been clarified yet. In this work, we systematically investigated this correlation in a typical perovskite oxide ferroelectric, Barium Titanate (BaTiO3) crystal, by second harmonic generation and the piezoresponse force microscopy technique...
August 22, 2017: Scientific Reports
Jagadeesh Suriyaprakash, Y B Xu, Y L Zhu, L X Yang, Y L Tang, Y J Wang, S Li, X L Ma
Engineering of novel functional nanocomposite as like as the metallic nanocrystals supported non-stoichiometric perovskite nanomaterial in controlled parameters (size, shape and ratio of chemical characteristics) is a challengeable task. In this context, we present a facile route to fabricate and study its physicochemical property at real time mode in this report. Nanoscale pure Pb crystals surfaced on non-stoichiometric A-site deficient Pb1-xTiO3-y nanoparticle were fabricated when a precursor lead titanate (PbTiO3) nanoparticle was exposed to an electron beam irradiation (EBI) in a transmission electron microscope (TEM) at ambient temperature...
August 21, 2017: Scientific Reports
Seiji Yamaguchi, Shekhar Nath, Yoko Sugawara, Kamini Divakarla, Theerthankar Das, Jim Manos, Wojciech Chrzanowski, Tomiharu Matsushita, Tadashi Kokubo
The inhibitory effect of gallium (Ga) ions on bone resorption and their superior microbial activity are attractive and sought-after features for the vast majority of implantable devices, in particular for implants used for hard tissue. In our work, for the first time, Ga ions were successfully incorporated into the surface of titanium metal (Ti) by simple and cost-effective chemical and heat treatments. Ti samples were initially treated in NaOH solution to produce a nanostructured sodium hydrogen titanate layer approximately 1 μm thick...
August 20, 2017: Nanomaterials
Haibo Yang, Fei Yan, Ying Lin, Tong Wang, Fen Wang
A series of (1-x)Bi0.48La0.02Na0.48Li0.02Ti0.98Zr0.02O3-xNa0.73Bi0.09NbO3 ((1-x)LLBNTZ-xNBN) (x = 0-0.14) ceramics were designed and fabricated using the conventional solid-state sintering method. The phase structure, microstructure, dielectric, ferroelectric and energy storage properties of the ceramics were systematically investigated. The results indicate that the addition of Na0.73Bi0.09NbO3 (NBN) could decrease the remnant polarization (P r ) and improve the temperature stability of dielectric constant obviously...
August 18, 2017: Scientific Reports
Ryan C Fortenberry, Timothy J Lee, Xinchuan Huang
The simple aromatic hydrocarbon, cyclopropenylidene (c-C3H2), is a known, naturally-occurring molecule. The question remains as to whether its isoelectronic, cyclic, fellow aromatics of c-N3(+), c-CNN, HCNN(+), and c-CNC(-) are as well. Each of these are exciting objects for observation of Titan, and the rotational constants and vibrational frequencies produced here will allow for remote sensing of Titan's atmosphere or other astrophysical or terrestrial sources. None of these four aromatic species are vibrationally strong absorbers/emitters, but the two ions, HCNN(+) and c-CNC(-), have dipole moments of greater than 3 D and 1 D, respectively, making them good targets for rotational spectroscopic observation...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
Jinyan Zhao, Wei Ren, Gang Niu, Nan Zhang, Guohua Dong, Lingyan Wang, Ming Liu, Peng Shi, Zuo-Guang Ye
Bismuth sodium titanate, Bi0.5Na0.5TiO3 (BNT), is a promising lead-free ferroelectric material. However, its potential applications have not been fully explored, mainly because of the complex domain structure arising from its intricate phase transitions. A deep and thorough study of its domain structure and polarization switching behavior will greatly help with understanding the polarization nature and with promoting future applications. In this work, we demonstrate that BNT polycrystalline films possess a highly ordered out-of-plane polarization (self-polarization) and randomly oriented in-plane polarizations...
August 30, 2017: ACS Applied Materials & Interfaces
Xiaoyan Jin, Joohyun Lim, Yoonhoo Ha, Nam Hee Kwon, Hyeyoung Shin, In Young Kim, Nam-Suk Lee, Myung Hwa Kim, Hyungjun Kim, Seong-Ju Hwang
The effect of the catalyst morphology on the growth of carbon nanotubes (CNT) on nanostructured transition metal oxides was investigated to study a novel low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites. Among several nanostructured manganese oxides with various morphologies and structures, only exfoliated 2D nanosheets of layered MnO2 acted as an effective catalyst for the chemical vapor deposition of CNT at low temperatures of 400-500 °C, which emphasizes the critical role of the catalyst morphology in CNT growth...
August 31, 2017: Nanoscale
Hai-Xia Zhang, Jun-Ming Du, Zhong-Nuo Ding, Xiao-Yan Zhu, Lai Jiang, Yu-Jian Liu
Mitochondrial dysfunction plays an important role in the pathogenesis of diaphragm weakness during sepsis. Recently, hydrogen sulfide (H2S), a gaseous transmitter endogenously generated by cystathionine-β-synthase (CBS), cystathionine-γ-lyase (CSE) and 3-mercaptopyruvate sulfurtransferase (3-MST), is found to improve mitochondrial function. The present study aimed to examine whether H2S synthases are expressed in the diaphragm, and investigated the effect of H2S donor in sepsis-induced diaphragm weakness and its relationship with mitochondrial function...
2017: American Journal of Translational Research
Cristiane F Vilarta, Marianna D Unger, Luciene M Dos Reis, Wagner V Dominguez, Elias David-Neto, Rosa M Moysés, Silvia Titan, Melani R Custodio, Mariel J Hernandez, Vanda Jorgetti
OBJECTIVES: Recent studies have shown a high prevalence of hypovitaminosis D, defined as a serum 25-hydroxyvitamin D level less than 30 ng/ml, in both healthy populations and patients with chronic kidney disease. Patients undergoing kidney transplant are at an increased risk of skin cancer and are advised to avoid sunlight exposure. Therefore, these patients might share two major risk factors for hypovitaminosis D: chronic kidney disease and low sunlight exposure. This paper describes the prevalence and clinical characteristics of hypovitaminosis D among patients undergoing kidney transplant...
July 2017: Clinics
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