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Soo Jin Kim, Mi Jang, Hee Yeon Yang, Jinhan Cho, Ho Sun Lim, Hoichang Yang, Jung Ah Lim
We report the instantaneous pulsed-light cross-linking of polymer gate dielectrics on a flexible substrate by using intensely pulsed white light (IPWL) irradiation. Irradiation with IPWL for only 1.8 s of a poly(4-vinylphenol) (PVP) thin film with the cross-linking agent poly(melamine-co-formaldehyde) (PMF) deposited on a plastic substrate was found to yield fully cross-linked PVP films. It was confirmed that the IPWL-cross-linked PVP films have smooth pinhole-free surfaces and exhibit a low leakage current density, organic solvent resistance, and good compatibility with organic semiconductor, and that they can be used as replacements for typical PVP dielectrics that are cross-linked with time and energy intensive thermal heating processes...
March 27, 2017: ACS Applied Materials & Interfaces
Dana Schwarz, Jens Weber
Mesoporous poly(melamine-formaldehyde) (MF) particles with surface areas of up to 200m(2)g(-1) were synthesized by an inverse emulsion polymerization using dodecane and Span80® as continuous phase. The finer details of the shape control (using emulsion techniques) and the porosity control (using silica nanoparticles as hard-template) are discussed. The impact of phase-separation processes on the observable porosity of the 20-200µm sized spherical particles is analysed by gas sorption methods and electron microscopy...
March 16, 2017: Journal of Colloid and Interface Science
Bo Xing, Honglin Chen, Xiaoming Zhang
Glyphosate (PMG) wastewater with 40-600 mg/L organic phosphorus (OP) and 1-4% CH2O was treated by catalytic wet oxidation (CWO) and the lime-catalyzed formose reaction to remove total phosphorus (TP) and improve biodegradability. Activated carbons (ACs) modified by H2O2 oxidation and thermal treatment with melamine were used as CWO catalysts and characterized by N2 adsorption/desorption and XPS. The CWO experiments were performed in an autoclave reactor at 110-130 °C and 1.0 MPa. The modified AC showed higher catalytic activity than the parent AC due to the introduction of nitrogen-containing functional groups, exhibited over 90% OP removal for various real PMG wastewaters, and had good stability for 20 consecutive CWO runs...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Bo Xing, Honglin Chen, Xiaoming Zhang
Glyphosate (PMG) wastewater, which is an organic phosphorus (OP) wastewater containing 200-3000 mg/L glyphosate, was treated via catalytic wet oxidation (CWO) to degrade glyphosate to orthophosphate (PO4(3-)). The catalysts were activated carbons (ACs) modified by H2O2 oxidation and thermal treatment with ammonia or melamine. The catalysts were characterized using N2 adsorption/desorption, Boehm titration, and XPS. The CWO experiments were performed in a co-current upflow fixed bed reactor at 110-130 °C and under 1...
March 23, 2017: Environmental Technology
Ying Zhou, Yao Wang, Tengfei Liu, Gang Xu, Guangming Chen, Huayi Li, Lichun Liu, Qiqi Zhuo, Jiaoxia Zhang, Chao Yan
The world faces severe environmental, human and ecological problems when major oil spills and organic discharges are released into the environment. And so it is imperative to develop tools and high performance innovative materials that can efficiently absorb these organic discharges. Furthermore, green, facile methods to produce these advanced materials are also needed. In this paper, we demonstrate a novel porous supersponge based on melamine coated with hBN. This superhydrophobic sponge (with a contact angle >150°) exhibits excellent absorption performance for oils and organic solvents, including good selectivity, high capacity (up to 175 g·g(-1)) and extraordinary recyclability (less than 20% decline after 30 cycles of absorption/squeezing)...
March 23, 2017: Scientific Reports
Hildburg Fry, Kerstin Mietle, Eileen Mähnert, Sebastian Zinke, Mandy Schwieters, Emanuele Pydde, Angelika Preiß-Weigert
Melamine and cyanuric acid have been mixed illegally into food and feed to increase the nitrogen content which results in deceptively high protein contents. As a consequence a maximum level for melamine of 2.5 mg kg(-1) feed was established by the European Union under directive 2002/32/EC. A method is required to quantify melamine and cyanuric acid for control of the maximum level. Therefore Technical Committee (TC) 327 of the European Committee for Standardisation (CEN) commissioned the standardisation of a method for the analysis of melamine and cyanuric acid in animal feed...
March 23, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Changchun Wang, Qiang Tao, Shushan Dong, Xin Wang, Pinwen Zhu
In this work, high-quality bulk WC-structured WN (δ-WN) was synthesized via an untraditional method and the structure was accurately determined by X-ray diffraction and Rietveld refinement. In the process of synthesizing δ-WN, W2N3 and melamine were used as tungsten source and nitrogen source, respectively. The result of successfully synthesized high-quality δ-WN indicates that our method is an effective route for synthesizing high-quality bulk δ-WN and melamine is a pure nitrogen source for introducing the nitrogen to the metal precursor...
March 22, 2017: Inorganic Chemistry
Kaustav Mohanty, John Blackwell, Thomas Egan, Marie Muller
The purpose of the study described here was to showcase the application of ultrasound to quantitative characterization of the micro-architecture of the lung parenchyma to predict the extent of pulmonary edema. The lung parenchyma is a highly complex and diffusive medium for which ultrasound techniques have remained qualitative. The approach presented here is based on ultrasound multiple scattering and exploits the complexity of ultrasound propagation in the lung structure. The experimental setup consisted of a linear transducer array with an 8-MHz central frequency placed in contact with the lung surface...
March 16, 2017: Ultrasound in Medicine & Biology
K Anand, Thishana Singh, G Madhumitha, A Phulukdaree, Robert M Gengan, A A Chuturgoon
The bio-synthesized DTAuNPs have an average size of 21nm. The aggregation extent depends on the concentration of melamine, which was validated by UV-vis spectra and visual method of melamine detection was developed. The major observation in this method was the color change of DTAuNPs from red to purple due to the aggregation of ligand capped gold nanoparticles instigated by melamine. The reaction of color changes were processed due to the shifting of bonding in hydrogen in between nanoparticles and melamine...
February 24, 2017: Journal of Photochemistry and Photobiology. B, Biology
Sopan Valiba Shinde, Pinaki Talukdar
A 3,7-diazabicyclo[3.3.1]nonane linking to two melamines is a unique transmembrane H(+) /Cl(-) carrier. In the solid state, the V-shaped compound forms a HCl-bound zig-zag network through cooperative protonation and hydrogen bond interactions. In the lipid membrane, the receptor forms a dimeric self-assembly involving multiple H(+) and Cl(-) leading to the efficient transport of the acid. The pH-dependent Cl(-) efflux observed for the compound was rationalized based on a gradual protonation model that confers an active transmembrane carrier at physiological pH...
March 9, 2017: Angewandte Chemie
T S Anirudhan, J Christa, J R Deepa
A novel magnetic molecularly imprinted polymer (MMIP) for the preconcentration of melamine, a non-protein nitrogen food additive from complex matrices was synthesized and characterized using FT-IR, XRD, SEM and VSM techniques. Surface imprinting was done on vinyltrimethoxysilane coated Fe3O4 (Fe3O4-VTMS) using 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N,N'-methylenebisacrylamide (MBA) and potassium persulfate (KPS) as functional monomer, crosslinker and initiator respectively. Saturation magnetization value obtained for MMIP was 1...
July 15, 2017: Food Chemistry
S Varun, S C G Kiruba Daniel, Sai Siva Gorthi
A highly sensitive, selective, and rapid interference green synthesis based determination of potential milk adulterant melamine has been reported here. Melamine is a nitrogenous compound added to milk for mimicking proteins, consumption of which leads to kidney stones and renal failures. Melamine interacts with ascorbic acid (AA) through strong hydrogen-bonding interactions, thus resulting in an interference/interruption in the formation of silver (Ag) nanoparticles which was confirmed by UV-Vis spectroscopy and Transmission Electron Microscopy (TEM)...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Xiaomeng Wang, Chunmiao Bo, Chaozhan Wang, Yinmao Wei
Mixed-mode chromatographic stationary phases require functionalization with at least two functional groups to yield multiple interactions with analytes. Departing from reported methods, a mixture of two different monomers, glycidyl methacrylate and 2-dimethylaminoethylmethacrylate, was grafted onto the surface of silica by a one-step surface-initiated atom transfer radical polymerization to prepare a novel hydrophilic interaction/anion-exchange mixed-mode chromatographic stationary phase. The grafted amounts of functional groups were controlled via varying the ratio of monomers in the polymerization system...
March 1, 2017: Journal of Separation Science
Pengju Yang, Honghui Ou, Yuanxing Fang, Xinchen Wang
The delamination of layered crystals that produces single or few-layered nanosheets while enabling exotic physical and chemical properties, particularly for semiconductor functions in optoelectronic applications, remains a challenge. Here, we report a facile and green approach to prepare few-layered polymeric carbon nitride (PCN) semiconductors by a one-step carbon/nitrogen steam reforming reaction. Bulky PCN, obtained from typical precursors including urea, melamine, dicyandiamide, and thiourea, are exfoliated into few-layered nanosheets, while engineering its surface carbon vacancies...
March 1, 2017: Angewandte Chemie
Zonghua Pu, Ibrahim Saana Amiinu, Chengtian Zhang, Min Wang, Zongkui Kou, Shichun Mu
Applications of highly-efficient and durable non-precious metal electrocatalysts for hydrogen evolution reaction (HER) have great potential to relieve the energy crisis. Here, we demonstrate a green method for fabrication of a number of transition metal phosphides (TMPs) by pyrolyzing melamine and self-assembled phytic acid (PA) cross-linked metal complexes. The obtained materials consisting of TMP nanoparticles (NPs) are encapsulated in N,P-codoped carbon (NPC). Among TMPs, the resultant FeP NPs encapsulated in the NPC matrix (FeP NPs@NPC) show the highest HER activity at all pH values...
February 28, 2017: Nanoscale
Xiu Qin Li, Qing He Zhang, Zong Yang, Hong Mei Li, Dong Feng Huang
In this paper, the effect of isotope-labeled analogs on the liquid chromatography-isotope dilution mass spectrometry (LC-IDMS) measurement was evaluated based on the comparison research of electrospray ionization responses (ESI) and matrix effect of melamine, (13)C3-melamine, (13)C3+(15)N3-melamine, and (15)N3-melamine. The isotope-labeled melamines had similar ionization efficiency with melamine in the electrospray ionization source, but the intensity of corresponding quantitative fragment ions had distinctive differences...
February 27, 2017: Analytical and Bioanalytical Chemistry
Selvakumar Palanisamy, Sayee Kannan Ramaraj, Shen-Ming Chen, Te-Wei Chiu, Vijayalakshmi Velusamy, Thomas C K Yang, Tse-Wei Chen, Sonadevi Selvam
A simple and cost effective synthesis of nanomaterials with advanced physical and chemical properties have received much attention to the researchers, and is of interest to the researchers from different disciplines. In the present work, we report a simple and one pot electrochemical synthesis of poly(melamine) entrapped gold nanoparticles (PM-AuNPs) composite. The PM-AuNPs composite was prepared by a single step electrochemical method, wherein the AuNPs and PM were simultaneously fabricated on the electrode surface...
December 29, 2016: Journal of Colloid and Interface Science
Zhiwen Lei, Guangzhao Zhang, Yonghong Deng, Chaoyang Wang
Here we have obtained a temperature responsive melamine sponge with a controllable wettability between superhydrophilicity and superhydrophobicity by grafting the octadecyltrichlorosilane and thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) onto the surface of melamine sponge skeletons. The whole process included the silanization in which step the rough surface with low surface energy and the NH2 were provided, and the atom transfer radical polymerization which ensured the successful grafting of PNIPAAm onto the skeleton's surface...
March 3, 2017: ACS Applied Materials & Interfaces
Shu-Wen Xue, Jing Li, Li Xu
Magnetic melamine-formaldehyde resin was prepared via water-in-oil emulsification approach by entrapping Fe3O4 magnetic nanoparticles as the core. The preparation of the magnetic resin was optimized by investigating the amount of polyethylene glycol 20000 and Fe3O4 nanoparticles, the concentration of the catalyst (hydrochloric acid), as well as the mechanical stirring rate. The prepared material was characteristic of excellent anion-exchange capacity, good water wettability, and proper magnetism. Its application was demonstrated by magnetic solid-phase extraction of nonsteroidal anti-inflammatory drugs coupled to high performance liquid chromatography-UV analysis...
February 21, 2017: Analytical and Bioanalytical Chemistry
Vinayak S Kale, Uk Sim, Jiwoong Yang, Kyoungsuk Jin, Sue In Chae, Woo Je Chang, Arun Kumar Sinha, Heonjin Ha, Chan-Cuk Hwang, Junghyun An, Hyo-Ki Hong, Zonghoon Lee, Ki Tae Nam, Taeghwan Hyeon
There is an urgent need to develop metal-free, low cost, durable, and highly efficient catalysts for industrially important oxygen evolution reactions. Inspired by natural geodes, unique melamine nanogeodes are successfully synthesized using hydrothermal process. Sulfur-modified graphitic carbon nitride (S-modified g-CN x ) electrocatalysts are obtained by annealing these melamine nanogeodes in situ with sulfur. The sulfur modification in the g-CN x structure leads to excellent oxygen evolution reaction activity by lowering the overpotential...
February 20, 2017: Small
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