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https://www.readbyqxmd.com/read/28094024/effect-of-nanoclay-addition-on-physical-chemical-optical-and-biological-properties-of-experimental-dental-resin-composites
#1
Tais Munhoz, Yann Fredholm, Pascaline Rivory, Sandra Balvay, Daniel Hartmann, Pedro da Silva, Jean-Marc Chenal
OBJECTIVE: To prepare organically modified montmorillonite (OM MMT) and assess mechanical, physical, chemical and biological effects of its introduction into resin-composites. METHODS: Natural MMT clay was modified by a methacrylate functionalized quaternary ammonium intercalating agent. Interlayer distance was measured by X-ray diffraction. Dental composites were then prepared with x=0, 1, 2.5, 5 or 7.5wt.% of OM MMT, (75-x) wt.% of silanated barium glass and 25wt...
January 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28093331/synthesis-of-2-alkenyl-3-butoxypropyl-guar-gum-with-enhanced-rheological-properties
#2
Fengsan Zhang, Yiding Shen, Ting Ren, Lei Wang, Ying Su
A new guar gum derivative was synthesized though the nucleophilic substitution of sodium hydroxide-activated guar gum with n-butyl glycidyl (BGE) ether. The physicochemical properties of 2-alkenyl-3-butoxypropyl guar gum (ABPG) were characterized by attenuated total reflection Fourier transform infrared spectrometry (ATR-FTIR), X-ray diffraction (XRD) and thermal gravimetric analyses (TGA). The results showed that sodium hydroxide can be effectively substituted with BGE to form the ABPG. The steady and dynamic rheological properties of the aqueous solution and ABPG gel were determined using an RS6000 rheometer...
January 13, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28093121/phenyltrichlorosilane-functionalized-magnesium-oxide-microspheres-preparation-characterization-and-application-for-the-selective-extraction-of-dioxin-like-polycyclic-aromatic-hydrocarbons-in-soils-with-matrix-solid-phase-dispersion
#3
Dongqin Tan, Jing Jin, Fang Li, Xiaoli Sun, Dhanjai, Yuwen Ni, Jiping Chen
Magnesium oxide microspheres functionalized with phenyltrichlorosilane (PTS-MgO) were synthesized by surface modification through silanization reaction, which was confirmed by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetry analysis (TGA) and N2 adsorption-desorption. The result indicated that PTS-MgO not only possessed the ability of enhancing the retention with PAHs, but also weakening the interference from chlorinated compounds. As a sorbent for the matrix solid-phase dispersion (MSPD) extraction, PTS-MgO was used to selectively extract seven dioxin-like polycyclic aromatic hydrocarbons (DL-PAHs) from soil samples...
March 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28092826/synthesis-ph-dependent-photometric-and-electrochemical-investigation-redox-mechanism-and-biological-applications-of-novel-schiff-base-and-its-metallic-derivatives
#4
Abdur Rauf, Afzal Shah, Abdul Aziz Khan, Aamir Hassan Shah, Rashda Abbasi, Irfan Zia Qureshi, Saqib Ali
A novel Schiff base, 1-((2, 4-dimethylphenylimino)methyl)naphthalen-2-ol abbreviated as (HL) and its four metallic complexes were synthesized and confirmed by (1)H and (13)C NMR, FTIR, TGA and UV-Visible spectroscopy. Schiff base was also characterized by X-ray analysis. The photometric and electrochemical responses of all the synthesized compounds were investigated in a wide pH range. Structures of the compounds were optimized computationally for the evaluation of different physico-chemical parameters. On the basis of electrochemical results the redox mechanistic pathways of the compounds were proposed...
January 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28092819/silver-nanoparticles-supported-over-mesoporous-alumina-as-an-efficient-nanocatalyst-for-n-alkylation-of-hetero-aromatic-amines-and-aromatic-amines-using-alcohols-as-alkylating-agent
#5
Priyanka Paul, Piyali Bhanja, Noor Salam, Usha Mandi, Asim Bhaumik, Seikh Mafiz Alam, Sk Manirul Islam
We have successfully embedded rhombohedral crystallites of silver nanoparticles (Ag-NPs) over mesoporous alumina (Ag@Al2O3) material for the first time. The Ag@Al2O3 has been characterized by powder X-ray diffraction (PXRD), ultra high resolution transmission electron microscopy (UHR-TEM), scanning electron microscopy (SEM), N2 adsorption/desorption isotherm, Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible absorption spectra (UV-Vis), and thermogravimetric analysis (TGA). The PXRD confirms the presence of the rhombohedral phase of Ag nanoparticles...
January 3, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28091944/controlled-phase-changes-of-titania-using-nitrogen-plasma
#6
R Trejo-Tzab, Liliana Caballero-Espada, P Quintana, Alejandro Ávila-Ortega, R A Medina-Esquivel
In this work, the development of a new crystallization technique is reported, using nitrogen plasma (AC) to obtain nanostructured anatase and rutile from amorphous titanium oxide (TiO2). This methodology increases throughput and minimizes thermal effects. Nanostructured amorphous TiO2 was obtained by the sol-gel method and subsequently subjected to AC treatment, at a controlled pressure, applying different powers and treatment times in order to obtain phase changes. The obtained samples were characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28091639/gold-nanoparticles-stabilized-by-cationic-carbosilane-dendrons-synthesis-and-biological-properties
#7
Cornelia E Peña-González, Elzbieta Pedziwiatr-Werbicka, Dzmitry Shcharbin, Carlos Guerrero-Beltrán, Viktar Abashkin, Svetlana Loznikova, José L Jiménez, M Ángeles Muñoz-Fernández, Maria Bryszewska, Rafael Gómez, Javier Sánchez-Nieves, F Javier de la Mata
Gold nanoparticles (AuNPs) and polycationic macromolecules are used as gene carriers. Their behaviour is dependent on several factors, such as the size and type of the framework, charge, etc. We have combined both types of systems and prepared AuNPs covered with cationic carbosilane dendrons with the aim to evaluate their biocompatibility. Water soluble dendronized cationic AuNPs were prepared following a straightforward procedure from dendrons, a gold precursor and a reducing agent in water and were characterized by (1)H NMR, transmission electron microscopy (TEM), dynamic light scattering (DLS), thermogravimetric analysis (TGA), ultraviolet spectroscopy (UV), and zeta potential (ZP)...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28088122/a-comparative-study-on-the-effects-of-ultrathin-luminescent-graphene-oxide-quantum-dot-goqd-and-graphene-oxide-go-nanosheets-on-the-interfacial-interactions-and-mechanical-properties-of-an-epoxy-composite
#8
B Karimi, B Ramezanzadeh
The reinforcement effect of graphene oxide nanosheets on the mechanical properties of an epoxy coating has been extensively studied. However, the effect of graphene oxide quantum dot (GOQD) as a new unique carbon based nanomaterial (with lateral dimension of 5-6nm and thickness of one carbon atom) on the mechanical properties of epoxy coating has not been reported and compared with GO yet. So this study aims at fabrication of a high-performance polymer composite with unique mechanical properties using GOQD nanosheets...
January 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28087449/highly-biocompatible-chitosan-with-super-paramagnetic-calcium-ferrite-cafe2o4-nanoparticle-for-the-release-of-ampicillin
#9
Ram Bilas, K Sriram, P Uma Maheswari, K M Meera Sheriffa Begum
The CaFe2O4 nanoparticles (CFNP) were synthesized using the solution combustion method. The CFNP-chitosan-ampicillin was prepared by the ionic gelation method using tripolyphosphate (TPP). The CFNP, chitosan-CFNP, chitosan-CFNP-ampicillin materials were characterized by XRD, FT-IR and TGA analysis in order to evaluate the particle nature and size, the presence of functional groups and their thermal stability. The FESEM and EDAX analysis were performed to understand the surface morphology of the materials and the presence of CFNP in the material, respectively...
January 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28081001/how-assembly-matters-to-catalysis-and-thermal-conductivity-mediated-by-cuo-nanoparticles
#10
Ahmed Mohsen Ismail, Mahmoud Mohamed Emara, Taher Salah El Din Kassem, Mahmoud Ahmed Moussa
CuO nanostructures (NSs) of different morphologies were prepared, applied as catalysts for the pyrolysis of sugarcane bagasse (PSCB), and applied for thermally-conductive nanofluids. Both size and shape of the prepared NSs ranged from 5 to 1000 nm, and from nanodots (NDs) to spindle nano-aggregates (NAs), respectively. The catalytic activity of these NSs towards the PSCB was followed up by thermogravimetric analysis (TGA), where they increased the percentage of total weight loss, and lowered the decomposition temperatures of PSCB...
January 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28080061/evaluation-of-a-new-biosensor-based-on-in-situ-synthesized-ppy-ag-pvp-nanohybrid-for-selective-detection-of-dopamine
#11
Balakumar Vellaichamy, Prakash Periakaruppan, Tharmaraj Paulmony
In the present work, in-situ synthesis of polypyrrole-silver-polyvinylpyrrolidone (PPy-Ag-PVP) nonohybrid using AgNO3 as an oxidant and polyvinyl pyrrolidone (PVP) as a stabilizer and surfactant is demonstrated. The obtained ternary PPy-Ag-PVP nanohybrid was characterized by UV-vis, FT-IR, XRD, Raman, TGA, SEM and HR-TEM analysis. Further the synthesized PPy-Ag-PVP has been investigated for its selective and sensitive sensing of dopamine (DA). The PPy-Ag-PVP modified glassy carbon electrode shows a reversible electrochemical behavior with superior response for DA...
January 12, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28079206/freestanding-moo2-mo2c-imbedded-carbon-fibers-for-li-ion-batteries
#12
Hongqin Li, Haijun Ye, Zheng Xu, Chuanyi Wang, Jiao Yin, Hui Zhu
Flexible and freestanding MoO2/Mo2C imbedded carbon fibers (MoO2/Mo2C ICFs) have been successfully synthesized via an integrated procedure including electrospinning, thermo-plastication in air and reduction/carbonization at high temperature. A series of techniques such as SEM, TEM, N2 adsorption-desorption analysis, XRD, TGA, IR and XPS have been employed to systemically characterize the MoO2/Mo2C ICFs. In particular, it is observed that the MoO2/Mo2C ICFs derived from phosphomolybdic acid have more highly porous structures than those derived from molybdic acid...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28074490/rationally-designed-blue-triplet-emitting-gold-iiii-complexes-based-on-phenylpyridine-derived-framework
#13
Michael Bachmann, Jasmin Terreni, Olivier Blacque, Koushik Venkatesan
A series of blue emitting phosphorescent monocyclometalated Au(III) complexes were successfully synthesized. Tailoring substitutions at the phenylpyridine (ppy) ligand scaffold with the electron withdrawing fluorine groups at the phenyl ring to achieve stabilization of the HOMO and electron donating dimethylamino group on the pyridine ring to destabilize the LUMO resulted in a large energy gap and bestowed the gold(III) complexes with emission at high energies and high quantum efficiencies. Cyclic voltammetry (CV) studies are suggestive of a predominantly cyclometalated ligand localized redox event...
January 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28070796/synthesis-characterization-and-photophysical-studies-of-tricoumarin-pyridines
#14
Nirmala S Naik, Lokesh A Shastri, Chinna Bathula, Bahubali Chougala, Samundeeswari Shastri, Megharaja Holiyachi, Vinay Sunagar
A series of novel tricoumarin-pyridines have been synthesized by the reaction of 4-formyl coumarins and substituted 3-acetylcoumarin with ammonium acetate for the application in organic electronics as well as fluorescent dyes. The structures of all new compounds were confirmed and characterized by IR, (1)H NMR and ESI-Mass analysis. All the important photo physical prerequisites for organic electronic application such as strong and broad optical absorption, thermal stability were determined for the synthesized molecules...
January 9, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28069234/ultrasonic-assisted-synthesis-of-bikitaite-zeolite-a-potential-material-for-hydrogen-storage-application
#15
Priyanka Roy, Nandini Das
Li containing Bikitaite zeolite has been synthesized by an ultrasound-assisted method and used as a potential material for hydrogen storage application. The Sonication energy was varied from 150W to 250W and irradiation time from 3h to 6h. The Bikitaite nanoparticles were characterized by X-ray diffraction (XRD), infrared (IR) spectral analysis, and field-emission scanning electron microscopy (FESEM) thermo-gravimetrical analysis and differential thermal analysis (TGA, DTA). XRD and IR results showed that phase pure, nano crystalline Bikitaite zeolites were started forming after 3h irradiation and 72h of aging with a sonication energy of 150W and nano crystalline Bikitaite zeolite with prominent peaks were obtained after 6h irradiation of 250W sonic energy...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28067387/-fe3nb25-cluster-based-on-an-fe-centred-keggin-unit
#16
Zhijie Liang, Ke Wang, Dongdi Zhang, Pengtao Ma, Jingyang Niu, Jingping Wang
A new heteropolyniobate, [Fe3Nb25O76](18-), persists in aqueous solution by means of electrospray ionization mass spectrometry. It has been synthesized and characterized by IR, TGA, EDX-SEM, magnetic and single-crystal X-ray diffraction, and it features an Fe-centred Nb-Keggin unit {Fe3Nb10}.
January 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28067040/large-pore-3-d-cubic-mesoporous-kit-6-hybrid-bearing-hard-soft-donor-combined-ligand-for-enhancing-u-vi-capture-an-experimental-and-theoretical-investigation
#17
Li-Yong Yuan, Lin Zhu, Chengliang Xiao, Qun-Yan Wu, Nan Zhang, Ji-Pan Yu, Zhifang Chai, Wei-Qun Shi
The preorganized tetradentate phenanthrolineamide (DAPhen) ligand with hard-soft donors combined in the same molecule has been found to possess high extraction ability towards actinides over lanthanides from acidic aqueous solution in our previous work. Herein, we grafted phenanthrolineamide groups onto a large pore three-dimensional (3-D) cubic silica support by the reaction of DAPhen siloxane with KIT-6 substrate to prepare a novel uranium-selective sorbent, KIT-6-DAPhen. The as-synthesized sorbent was well characterized by SEM, HRTEM, N2 adsorption/desorption, XRD, FT-IR, 13C CP/MAS NMR, and TGA techniques, which confirmed the consummation of the functionalization...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28065752/covalent-immobilization-of-trypsin-onto-modified-magnetite-nanoparticles-and-its-application-for-casein-digestion
#18
Keziban Atacan, Bekir Çakıroğlu, Mahmut Özacar
The immobilization method consists of the production magnetite nanoparticles (Fe3O4) by solvothermal treatment of FeCl3 and sodium acetate (NaAc) in the presence of ethylene glycol. Subsequently, the surface of magnetite nanoparticles was modified with a well-known polyphenol tannic acid. Trypsin was covalently immobilized on the tannic acid modified magnetite nanoparticles after exposing the modified nanoparticles to pH 9.4. Then, tryptic digestion of casein by free and immobilized trypsin was carried out for 13h and 1h, respectively...
January 5, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28065751/honeycomb-structural-composite-polymer-network-of-gelatin-and-functional-cellulose-ester-for-controlled-release-of-omeprazole
#19
Chen Zhuang, Chengmei Shi, Furong Tao, Yuezhi Cui
The functionalized cellulose ester MCN was firstly synthesized and used to cross-link gelatin by amidation between -NH2 in gelatin and active ester groups in MCN to form a composite polymer network Gel-MCN, which was confirmed by Van Slyke method, FTIR, XRD and TGA-DTG spectra. The model drug omeprazole was loaded in Gel-MCN composites mainly by electrostatic interaction and hydrogen bonds, which were certified by FTIR, XRD and TGA-DSC. Thermal stability, anti-biodegradability, mechanical property and surface hydrophobicity of the composites with different cross-linking extents and drug loading were systematically investigated...
January 5, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28064495/photophysical-behavior-of-isocyanine-clay-hybrids-in-solid-state
#20
Silvano R Valandro, Alessandra L Poli, Thaís F A Correia, Patricia C Lombardo, Carla C Schmitt
In the present study we have attempted to investigate, for the first time, the photophysical behavior of 1,1'-diethyl-2,4'-cyanine (ICY)/clay minerals hybrids in solid state. The effects promoted by ICY loading and clay type on the spectroscopic properties were studied by UV-Vis diffuse reflectance spectroscopy (DR) and different fluorescence techniques. The hybrids were characterized by X-ray diffraction (XRD) and thermogravimetric analysis (TGA). UV-Vis-DR revealed the formation of ICY H-aggregates in Wyoming montmorillonite (SWy-1) and Laponite (Lap), however J-aggregates were predominant for ICY on Arizona (SAz-1) and Barasym (SYn-1) montmorillonites...
January 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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