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Xiaowei Mu, Jing Zhan, Xiaming Feng, Bihe Yuan, Shuilai Qiu, Lei Song, Yuan Hu
Covalent organic frameworks (COFs) nanosheets prepared from condensation reaction between melamine and o-phthalaldehyde are firstly prepared through ball milling and then incorporated into thermoplastic polyurethanes (TPU) by solution mixing. Transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectrometer are applied to characterize COFs nanosheets. It is observed apparently from TEM image that COFs nanosheets are obtained...
June 21, 2017: ACS Applied Materials & Interfaces
Zupeng Chen, Aleksandr Savateev, Sergey Pronkin, Vasiliki Papaefthimiou, Christian Wolff, Marc Georg Willinger, Elena Willinger, Dieter Neher, Markus Antonietti, Dariya Dontsova
Cost-efficient, visible-light-driven hydrogen production from water is an attractive potential source of clean, sustainable fuel. Here, it is shown that thermal solid state reactions of traditional carbon nitride precursors (cyanamide, melamine) with NaCl, KCl, or CsCl are a cheap and straightforward way to prepare poly(heptazine imide) alkali metal salts, whose thermodynamic stability decreases upon the increase of the metal atom size. The chemical structure of the prepared salts is confirmed by the results of X-ray photoelectron and infrared spectroscopies, powder X-ray diffraction and electron microscopy studies, and, in the case of sodium poly(heptazine imide), additionally by atomic pair distribution function analysis and 2D powder X-ray diffraction pattern simulations...
June 20, 2017: Advanced Materials
Weiwei Zhao, Yaxun Fan, Hua Wang, Yilin Wang
Coacervation in aqueous solution of the mixture of cationic ammonium surfactant hexamethylene-1,6-bis(dodecyldimethylammonium bromide) (12-6-12) and 10% hydrolyzed polyacrylamide (PAM) has been investigated. It was found that the 12-6-12/PAM mixture forms coacervate with a large network structure over a wide concentration range of surfactant and polyelectrolyte, and shows great efficiency in the extraction of methyl orange (MO) from water owing to the cooperation of hydrophobic, electrostatic and π-cation interactions...
June 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Ke Shang, Jun-Chi Yang, Zhijie Cao, Wang Liao, Yu-Zhong Wang, David A Schiraldi
Inorganic silica-based aerogels, earliest and widely-used aerogels, have poorer mechanical properties than their organic substitutes, which are flammable. In this study, a novel polymeric aerogel with high strength, inherent flame retardancy and cost-effectiveness, which is based on poly(vinyl alcohol) (PVA) crosslinked with melamine-formaldehyde (MF), was prepared under aqueous condition with an eco-friendly freeze-drying and post-curing process. Combined with the additional rigid MF network and benifited from the resulting unique infrastructure of inter-crosslinked flexible PVA segments and rigid MF segments, PVA-based aerogels exibited a significantly decreased degradation rate, and sharply decreased peak heat release rate (PHRR) in cone calorimeter tests (by as much as 83%) compared with neat PVA...
June 16, 2017: ACS Applied Materials & Interfaces
Peter F Scholl, Marti M Bergana, Betsy Jean Yakes, Zhuohong Xie, Steven Zbylut, Gerard Downey, Magdi M Mossoba, Joseph Edward Jablonski, Robert Magaletta, Stephen E Holroyd, Martin Buehler, Jianwei Qin, William Jeffrey Hurst, Joseph H LaPointe, Dean E Roberts, Carol Zrybko, Andrew Mackey, Jason D Holton, Greg A Israelson, Anitra Payne, Moon S Kim, Kuanglin Chao, Jeffrey C Moore
The U.S. Pharmacopeia has led an international collaborative project to develop a tool-box of screening methods and reference standards for the detection of milk powder adulteration. During the development of adulterated milk powder reference standards, blending methods used to combine melamine and milk had unanticipated strong effects on the NIR spectrum of melamine. The prominent absorbance band at 1468 nm of melamine was retained when it was dry-blended with skim milk powder but disappeared in wet-blended mixtures, where spray dried milk powder samples were prepared from solution...
June 15, 2017: Journal of Agricultural and Food Chemistry
Maisam Jalaly, Francisco José Gotor, Masih Semnan, María Jesús Sayagués
The ternary compound boron carbonitride (BCN) was synthesized in the form of few-layer nanosheets through a mechanically induced self-sustaining reaction (MSR). Magnesium was used to reduce boron trioxide in the presence of melamine in a combustive manner. The process to form the nanostructured material was very rapid (less than 40 min). The prepared powder was investigated by various techniques such as X-ray diffraction (XRD), Fourier Transform infrared (FTIR), Micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS)...
June 14, 2017: Scientific Reports
Yixing Li, Zhe Mao, Rongge Liu, Xiaoning Zhao, Yanhui Zhang, Gaowu Qin, Xuefeng Zhang
Microwave absorbers are usually designed to solve electromagnetic interferences at a specific frequency, while the requirements may be dynamic during service life. Therefore, a recoverable tuning for the microwave absorption properties in response to an external stimulus would be highly desirable. We herein present a micro/nano-scale hybrid absorber, in which the high-performance Fe@C nanocapsule absorbents are integrated with the porous melamine sponge skeleton, exhibiting multiple merits of lightweight, strong absorption and high elasticity...
June 14, 2017: Nanotechnology
Dongxing Song, Dengwei Jing
Regulation of the localized surface plasmon resonance (LSPR) of nanoparticles by changing the dielectric constant of the surrounding medium has been exploited in many practical applications. In this study, using Ag-nanodot-decorated SiO2 nanoparticles (Ag-decorated SiO2NPs) with different solvents, we investigated the potential of using such core-satellite nanostructures as a liquid sensor for the determination of melamine. The dielectric constant effect of the surrounding medium on the LSPR property was given particular attention...
June 3, 2017: Journal of Colloid and Interface Science
Seda Çakir, Erwin Bauters, Guadalupe Rivero, Tom Parasote, Johan Paul, Filip E Du Prez
The synthesis of microcapsules via in situ polymerization is a labor-intensive and time-consuming process, where many composition and process factors affect the microcapsule formation and its morphology. Herein, we report a novel combinatorial technique for the preparation of melamine-formaldehyde microcapsules, using a custom-made and automated high-throughput platform (HTP). After performing validation experiments for ensuring the accuracy and reproducibility of the novel platform, a design of experiment study was performed...
June 15, 2017: ACS Combinatorial Science
Xiaodong Jin, Jun Sun, Jessica Shiqing Zhang, Xiaoyu Gu, Serge Bourbigot, Hongfei Li, Wufei Tang, Sheng Zhang
The flammability and melt dripping of the widely used bio-based polyamide 11 (PA 11) have attracted much attention in the last decade, and they are still a big challenge for the fire science society. In this work, a novel single macromolecular intumescent flame retardant (AM-APP) which contains an acid source and a gas source was prepared by supramolecular reactions between melamine and p-aminobenzene sulfonic acid, followed by an ionic exchange with ammonium polyphosphate. The chemical structure of AM-APP was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and Scanning electron microscopy (SEM)...
May 31, 2017: ACS Applied Materials & Interfaces
Hao Peng, Zuohua Liu, Changyuan Tao
Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Betsy Jean Yakes, Marti M Bergana, Peter F Scholl, Magdi M Mossoba, Sanjeewa R Karunathilaka, Luke K Ackerman, Jason D Holton, Boyan Gao, Jeffrey C Moore
During the development of rapid screening methods to detect economic adulteration, spray-dried milk powders prepared by dissolving melamine in liquid milk exhibited an unexpected loss of characteristic melamine features in the NIR and Raman spectra. To further characterize this "wet-blending" phenomenon, spray-dried melamine and lactose samples were produced as a simplified model and investigated by near-infrared spectroscopy, Raman spectroscopy, 1H NMR, and DART-FTMS. In contrast to dry-blended samples, characteristic melamine bands in NIR and Raman spectra disappeared or shifted in wet-blended lactose-melamine samples...
May 24, 2017: Journal of Agricultural and Food Chemistry
Lei An, Wei Sun
Developmental exposure to melamine induces long-term effects on brain and behavior in male rodents. To examine whether this prenatal event damages cognitive function in female offspring, we evaluated the behavioral effects and further attempted to investigate synaptic function. Prenatal melamine exposure (PME) was given by oral treatment to pregnant females through the whole gestational days with 400mg/day/kg bodyweight. On postnatal day (PD) 36, female offspring were assessed for spatial cognition in the Morris Water Maze (MWM) test...
May 18, 2017: Neurotoxicology
Rong H Yin, Qiao Dong, Hua S Li, Jing Yuan, Xi T Li, Rong L Yin, Wen Li, Wen C Wang, Bao S Liu, Xiao H Han, Ren F Wang, Xin Wang, Wen L Bai
Melamine is commonly used in the chemical industry, and it has been found to exist on food processing equipment and utensils. Previous investigations suggested that melamine alone or its combination with cyanuric acid appears to be toxic to immune system in animals. The objective of this study is to investigate the potential effects of melamine with or without cyanuric acid on immune function in ovalbumin- sensitized mice. Our data indicated that melamine-related administration caused a significant decreasing in the content of IL-4 in mice in comparison to negative control group...
May 13, 2017: Research in Veterinary Science
Lingling Xu, Dandan Yin, Hongyang Zhao, Na Li, Suhua Chen, Jiale Xia, Bingan Lu, Yaping Du
Carbon thin film/carbon foam core-sheath structure is synthesized by chemical vapor deposition on carbonized melamine foam. The unique structure has specific capacitance of 310 F g-1 at current density of 1 A g-1. The structure shows outstanding electrochemical performance in both aqueous and "water-in-salt" electrolyte. Electrochemical analysis by cyclic voltammetry and galvanostatic charge-discharge test reveals there is high capacitive contribution up to more than 90% of its total capacitance. The core-sheath structure has advantages in ion transport as well as high utilization of electrode surface, and the synthesis process shows a way to coat carbon thin film on any substrate using nickel catalyzed chemical vapor deposition method...
May 10, 2017: Chemistry: a European Journal
Waheed Iqbal, Bocheng Qiu, Juying Lei, Lingzhi Wang, Jinlong Zhang, Masakazu Anpo
The development of highly active, cost-effective, environmentally friendly and stable g-C3N4 based photocatalysts for H2 evolution is one of the most anticipated potential pathways for future hydrogen utilization. Herein, a facile gaseous bubble template approach was designed to prepare large-scale thin g-C3N4 nanosheets (g-C3N4 NSs) using melamine and ammonium sulphate as the bubble template. Through distinctive structural improvements for a large bandgap, excellent electron mobility, prolonged lifetime of the photogenerated charge carriers and a high specific surface area with highly accessible potential reaction sites, the as-synthesized g-C3N4 NSs demonstrated a high photocatalytic hydrogen evolution rate of 9871 μmol h(-1) g(-1) and efficient photocatalytic degradation of Rhodamine B (RhB) and phenol under simulated solar light irradiation...
May 11, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
S Moncayo, S Manzoor, J D Rosales, J Anzano, J O Caceres
The present work focuses on the development of a fast and cost effective method based on Laser Induced Breakdown Spectroscopy (LIBS) to the quality control, traceability and detection of adulteration in milk. Two adulteration cases have been studied; a qualitative analysis for the discrimination between different milk blends and quantification of melamine in adulterated toddler milk powder. Principal Component Analysis (PCA) and neural networks (NN) have been used to analyze LIBS spectra obtaining a correct classification rate of 98% with a 100% of robustness...
October 1, 2017: Food Chemistry
Xiao-Guang Yu, Yuan-Qing Li, Wei-Bin Zhu, Pei Huang, Tong-Tong Wang, Ning Hu, Shao-Yun Fu
Melamine sponge, also known as nano-sponge, is widely used as an abrasive cleaner in our daily life. In this work, the fabrication of a wearable strain sensor for human motion detection is first demonstrated with a commercially available nano-sponge as a starting material. The key resistance sensitive material in the wearable strain sensor is obtained by the encapsulation of a carbonized nano-sponge (CNS) with silicone resin. The as-fabricated CNS/silicone sensor is highly sensitive to strain with a maximum gauge factor of 18...
May 25, 2017: Nanoscale
Keke Chang, Shun Wang, Hao Zhang, Qingqian Guo, Xinran Hu, Zhili Lin, Haifeng Sun, Min Jiang, Jiandong Hu
A biosensing system with optical fibers is proposed for the colorimetric detection of melamine in liquid milk samples by using the localized surface plasmon resonance (LSPR) of unmodified gold nanoparticles (AuNPs). The biosensing system consists of a broadband light source that covers the spectral range from 200 nm to 1700 nm, an optical attenuator, three types of 600 μm premium optical fibers with SMA905 connectors and a miniature spectrometer with a linear charge coupled device (CCD) array. The biosensing system with optical fibers is low-cost, simple and is well-proven for the detection of melamine...
2017: PloS One
Anindita Roy, Ramkrishna Sahoo, Joydeep Chowdhury, Tara Shankar Bhattacharya, Ratnesh Agarwal, Tarasankar Pal
Attention has been directed to prepare exclusive one-dimensional silver nanostructure from the linear inorganic polymer AgCN. Successive color change from yellow to orange, to red and finally to green reflects the evolution of high yielding Ag nanorods (NRs) from well-known -[Ag-CN]- chains of polymeric AgCN at room temperature. The parental 1D morphology of AgCN is retained within the as-synthesized Ag NRs. So we could successfully exploit the Ag NR for surface-enhanced Raman scattering (SERS) studies for sensing a popular milk adulterant melamine down to picomolar level...
April 27, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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