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https://www.readbyqxmd.com/read/29451094/growth-and-optimization-of-carbon-nanotubes-in-powder-activated-carbon-for-an-efficient-removal-of-methylene-blue-from-aqueous-solution
#1
Haiyam Mohammed Alayan, Mohammed Abdulhakim Alsaadi, Mohammed Khaled AlOmar, Mohd Ali Hashim
This work demonstrated the synthesis of carbon nanotubes (CNTs) on powder activated carbon (PAC) impregnated with Ni-catalyst through chemical vapor deposition. The optimized effects of reaction temperature, time and feedstock flow rates on CNT growth were examined. Potassium permanganate (KMnO 4 ) and potassium permanganate in acidic solution (KMnO 4 /H 2 SO 4 ) were used to functionalize CNTs samples. A primary screening of methylene blue (MB) adsorption was conducted. The chemical, physical and morphological properties of the adsorbent with the highest removal efficiency were investigated using FESEM, EDX, TEM, BET surface area, RAMAN, TGA, FTIR, and zeta potential...
February 16, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29450805/ph-responsive-cap-co-poly-methacrylic-acid-based-hydrogel-as-an-efficient-platform-for-controlled-gastrointestinal-delivery-fabrication-characterization-in-vitro-and-in-vivo-toxicity-evaluation
#2
Syed Ahmed Shah, Muhammad Sohail, Muhammad Usman Minhas, Nisar-Ur-Rehman, Shahzeb Khan, Zahid Hussain, Mudassir, Arshad Mahmood, Mubeen Kousar, Asif Mahmood
Cellulose acetate phthalate-based pH-responsive hydrogel was synthesized for fabrication of polymeric matrix tablets for gastro-protective delivery of loxoprofen sodium. Cellulose acetate phthalate (CAP) was cross-linked with methacrylic acid (MAA) using free radical polymerization technique. Fourier transform infrared (FTIR) spectra confirmed the formation of cross-linked structure of CAP-co-poly(methacrylic acid). Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) confirmed the thermal stability of polymeric networks, and scanning electron microscopy (SEM) and energy-dispersive X-ray spectrum (EDS) images unveiled that the prepared formulations were porous in nature and thus the developed formulations had shown better diffusibility...
February 15, 2018: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/29449113/characterization-of-the-non-metal-fraction-of-the-processed-waste-printed-circuit-boards
#3
Amit Kumar, Maria E Holuszko, Travis Janke
Electronic waste is one the fastest growing waste streams in the world and waste printed circuit boards (PCB) are the most valuable part of this stream due to the presence of gold, silver, copper, and palladium. The metal present in PCBs is mostly recovered for the market value whereas the nonmetal fractions are often ignored. This research explored the characteristics of the non-metal fraction (NMF) obtained after the processing of milled waste PCBs with a focus on responsible end-of-life solutions, in the form of non-hazardous landfilling or incineration...
February 12, 2018: Waste Management
https://www.readbyqxmd.com/read/29448721/oxidation-and-tribological-behavior-of-ti-b-c-n-si-nanocomposite-films-deposited-by-pulsed-unbalanced-magnetron-sputtering
#4
Jaeho Jang, Sungbo Heo, Wang Ryeol Kim, Jun-Ho Kim, Dae-Geun Nam, Kwang Ho Kim, Ikmin Park, In-Wook Park
Quinary Ti-B-C-N-Si nanocomposite films were deposited onto AISI 304 substrates using a pulsed d.c. magnetron sputtering system. The quinary Ti-B-C-N-Si (5 at.%) film showed excellent tribological and wear properties compared with those of the Ti-B-C-N films. The steady friction coefficient of 0.151 and a wear rate of 2 × 10-6 mm3N-1m-1 were measured for the Ti-B-C-N-Si films. The oxidation behavior of Ti-B-C-N-Si nanocomposite films was systematically investigated using X-ray diffraction (XRD), and thermal analyzer with differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448692/preparation-of-caco%C3%A2-and-cao-nanoparticles-via-solid-state-conversion-of-calcium-oleate-precursor
#5
Raji Atchudan, Nasreena Lone, Jin Joo
Calcium carbonate (CaCO3) and monodisperse calcium oxide nanoparticles (CaO NPs) are prepared by the calcination of solid-state calcium oleate precursor in air condition. The effect of calcination temperature on the synthesis of CaCO3 and CaO NPs is examined. The polymorphism is confirmed by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The sample morphologies including their size and size distribution are investigated by field emission scanning electron microscopy (FESEM)...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448625/aptamers-based-sensing-strategy-for-17-%C3%AE-estradiol-through-fluorescence-resonance-energy-transfer-between-oppositely-charged-cdte-quantum-dots-and-gold-nanoparticles
#6
Ying Li, Ruifang Su, Jingyue Xu, Jiaxin Bie, Rui Sun, Luokai Wang, Xin Liu, Chunyan Sun
A novel aptamers-based fluorescence resonance energy transfer (FRET) assay was developed employing the oppositely charged thioglycolic acid-capped CdTe quantum dots (TGA-CdTe QDs) and cysteamine-stabilized gold nanoparticles (cysteamine-AuNPs). The fluorescence of TGA-CdTe QDs was significantly quenched with addition of cysteamine-AuNPs via the FRET. The FRET process can be modulated by 17β-estradiol in that the specific recognition between 17β-estradiol and aptamers could show different effects on the aptamers-mediated aggregation of cysteamine-AuNPs, and correspondingly adjust the FRET process...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448615/synthesis-of-the-molybdenum-precursor-for-slurry-phase-hydrocracking-of-heavy-oil
#7
Byong-Min Choi, Seok-Hwan Son, Min-Sub Noh, Kwang-Seok Lee, Chul-Wee Lee, Sun-Yeong Park, Min-Chul Chung
In this study, Molybdenum precursors were synthesized with butanoic acid, hexanoic acid, nonanoic acid, decanoic acid, and undecanoic acid. In order to determine chemical structure of Synthesized molybdenum precursors, 1H(13C)-NMR, EA and ICP were used pyrolysis properties were measured TGA. The molybdenum precursors was used for Hydrocracking of Vacuum R1esidue (VR). It was shown that molybdenum nonanoate(3) was shown the lowerst Toluene Insoluble and Gas Product about 2.1 and 5.0 percent.
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448590/catalytic-pyrolysis-of-korean-pine-pinus-koraiensis-nut-shell-over-mesoporous-al%C3%A2-o%C3%A2
#8
Young-Min Kim, Gwang Hoon Rhee, Chang Hyun Ko, Tae Uk Han, Sang Chai Kim, Young-Kwon Park
The catalytic pyrolysis of waste Korean pine nut shell (KPNS) over mesoporous Al2O3 was investigated by thermogravimetric analysis (TGA) and pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). TGA results showed that the thermal and catalytic pyrolysis of KPNS over mesoporous Al2O3 has the same decomposition temperature. On the other hand, the maximum decomposition for the catalytic pyrolysis of KPNS over commercial-Al2O3 shifted to a higher temperature. The Py-GC/MS results indicated that large amounts of oxygen-containing pyrolyzates, such as acids, furans, levoglucosan, and phenols, were produced by the non-catalytic pyrolysis of KPNS...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448575/preparation-and-characterization-of-conductive-polymer-blends-of-polypyrrole-and-poly-ethylene-oxide
#9
Carla Marega, Roberta Saini
Conductive polymer blends of polypyrrole (PPy) and poly(ethylene oxide) (PEO) were obtained in the form of films and fibers, respectively by solvent casting and electrospinning. Different amounts of PPy were introduced in the blends in order to study the effect of the conductive polymer on the properties of the final material and in particular to elucidate the influence of the different morphology on conductivity. The structure and morphology of PPy/PEO blends were characterized by wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to understand the influence of different PPy content on thermal behavior and stability, electrospun fibrous mats were examined by scanning electron microscopy (SEM)...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448569/preparation-and-performance-validation-of-nano-perovskite-type-for-carbon-dioxide-reforming-of-methane
#10
Taegyu Kim, Daeil Park
This paper describes the La0.8Sr0.2NiO3 perovskite-type catalysts supported on α-Al2O3 that were prepared by polyol method and used as a catalyst for the carbon dioxide reforming of methane. The effect of the molar concentration of polyvinyl-pyrrolidone (PVP) on the reducibility, structural properties and carbon deposition was characterized by XRD, and TGA. The carbon dioxide reforming of methane on the catalyst was performed at the different concentration of PVP. At the 1 M PVP, main characteristic peaks of perovskite structure were established without impurities, thus showing the highest catalytic activity; 87...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448541/preparation-of-polyurethane-acrylate-coated-carbon-nanotube-nanocomposites-by-emulsion-polymerization
#11
Jila Talat, Mohammad Sabzi, Behrouz Safibonab, Iraj Hasanzadeh, Ali Arman, Isa Karimzadeh
The aim of this work was to prepare strong and conductive polyurethane acrylate nanocomposites. First, urethane prepolymers with different molecular weights and hydrophilicities were synthetized. Then, their corresponding polyurethane acrylate nanocomposites were prepared by ultrasonically-assisted emulsion polymerization in the presence of various ratios of urethane prepolymers and acrylate monomers. Thermogravimetric analysis (TGA) and tensile results showed that thermal stability and mechanical properties of polyurethane acrylate samples are significantly dependent on the molecular weight and hydrophilicity of the urethane prepolymer as well as the content of acrylate monomers...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448497/green-electrospining-of-hydroxypropyl-cellulose-nanofibres-for-drug-delivery-applications
#12
Mohamed H El-Newehy, Mehrez E El-Naggar, Saleh Alotaiby, Hany El-Hamshary, Meera Moydeen, Salem Al-Deyab
Electrospun nanofibers mats are green synthesized using hydroxypropyl cellulose (HPC) individually or in conjugation with either poly(vinyl alcohol) (PVA) or Polyvinylpyrrolidone (PVP) to enhance the mechanical properties of the nanofibers mats. Desirable attributes of the as-obtained nanofibers mats are manifested via using SEM, FT-IR, TGA and conventional tools for mechanical and physical properties. The obtained data from SEM images demonstrated that the diclofenac sodium (DS) loaded nanofibers mats did not provide significant change of the morphological structure to the mats...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29447965/simple-fabrication-of-chitosan-graphene-nanoplates-composite-spheres-for-efficient-adsorption-of-acid-dyes-from-aqueous-solution
#13
Conglu Zhang, Zezhi Chen, Wei Guo, Chengwu Zhu, Yajie Zou
A facile method for the fabrication of crosslinked chitosan/graphene nanoplates composite sphere (CS/GNPs) was presented. The obtained samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and thermogravimetric analysis (TGA). The adsorption activities of CS/GNPs for methyl orange (MO) and acid red 1 (AR1) were evaluated such as the effect of pH and GNPs content, as well as adsorption kinetics and isotherms. In view of practical, the reusability of CS/GNPs was also tested...
February 12, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29445820/a-drastic-influence-of-the-anion-nature-and-concentration-on-high-pressure-intrusion-extrusion-of-electrolyte-solutions-in-silicalite-1
#14
A Ryzhikov, H Nouali, T J Daou, J Patarin
High pressure intrusion-extrusion of concentrated solutions of sodium salts in a pure-silica MFI-type zeolite (Silicalite-1) was studied for potential applications in mechanical energy absorption and storage. It was discovered that the anion nature has a drastic influence on the behavior and the energetic performances of "Silicalite-1 - concentrated Na + X - solution" systems, where X = Cl - , Br - , I - , NO 2 - , NO 3 - , ClO 4 - and CrO 4 2- . In the case of NaNO 2 , NaClO 4 , Na 2 CrO 4 , and NaI a combination of bumper and shock-absorber behaviors with a partial irreversible solution intrusion was observed, whereas a fully reversible spring behavior is demonstrated for the intrusion-extrusion of NaBr, NaCl and NaNO 3 solutions...
February 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29445090/two-sprayer-cvd-synthesis-of-nitrogen-doped-carbon-sponge-type-nanomaterials
#15
Emilio Muñoz-Sandoval, Juan L Fajardo-Díaz, Roque Sánchez-Salas, Alejandro J Cortés-López, Florentino López-Urías
Nitrogen-doped carbon sponge-type nanostructures (N-CSTNs) containing coaxial multiwalled carbon nanotubes are synthesized at 1020 °C by using a modified chemical vapor deposition (CVD) arrangement. Here, the CVD reactor is supplied by two flows coming from two independent sprayers (called sprayer A and sprayer B). The nebulized material in each sprayer is transported by two different gases with different flow velocities. The synthesis of carbon N-CSTNs is performed using different precursors: sprayer A contains a solution composed of ethanol, thiophene and ferrocene, whereas sprayer B contains a solution of benzylamine, thiophene and ferrocene...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29444099/airway-ciliary-dysfunction-and-respiratory-symptoms-in-patients-with-transposition-of-the-great-arteries
#16
Maliha Zahid, Abha Bais, Xin Tian, William Devine, Dong Ming Lee, Cyrus Yau, Daniel Sonnenberg, Lee Beerman, Omar Khalifa, Cecilia W Lo
BACKGROUND: Our prior work on congenital heart disease (CHD) with heterotaxy, a birth defect involving randomized left-right patterning, has shown an association of a high prevalence of airway ciliary dysfunction (CD; 18/43 or 42%) with increased respiratory symptoms. Furthermore, heterotaxy patients with ciliary dysfunction were shown to have more postsurgical pulmonary morbidities. These findings are likely a reflection of the common role of motile cilia in both airway clearance and left-right patterning...
2018: PloS One
https://www.readbyqxmd.com/read/29442966/facile-synthesis-and-down-conversion-emission-of-re-3-doped-lutetium-oxide-nanoparticles
#17
Zhenhe Xu, Junying Lin, Yaguang Sun, Fu Ding, Hongtao Fan, Shan Shi, Qinghong Fang, Yanfeng Bi, Yu Gao
Lu2O3:RE3+ (RE3+ = Eu3+, Tb3+, Ho3+) nanoparticles have been successfully synthesized by a facile homogeneous precipitation method with subsequent sintering process. The crystal structure, morphology and luminescence properties of the as-prepared samples have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), photoluminescence (PL) and cathodoluminescence (CL) spectra. Upon ultraviolet (UV) and low-voltage electron beam excitation, Lu2O3:RE3+ (RE3+ = Eu3+, Tb3+, Ho3+) nanoparticles show strong red (Eu3+,5D0 → 7F2), green (Tb3+,5D4 → 7F5), and green (Ho3+,5S2 → 5I8) emissions...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442925/effect-of-protective-agents-on-silver-nanoparticle-preparation-by-vacuum-evaporation-on-running-hydrocarbon-solution
#18
Takashi Ienaga, Yoshio Nakahara, Setsuko Yajima, Keiichi Kimura
In order to simply compare the performance of protective agents in the preparation of metal nanoparticles, a systematic investigation based on the same synthetic conditions is necessary. We successfully achieved this objective using improved vacuum evaporation on running oil substrate (VEROS) method. The efficient synthesis of nanoparticles with the improved VEROS method enabled us to characterize them by various analytical methods. In this study, five types of protective agents with different functional groups were employed to clarify their effect on the preparation of silver nanoparticles...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442914/structural-spectroscopic-investigation-and-computational-study-on-nitrate-and-hydrogen-oxalate-salts-of-2-aminopyrimidine
#19
S Thangarasu, S Athimoolam, S Asath Bahadur, A Manikandan
The proton transfer salts of 2-aminopyrimidine with nitric acid (2APNO) and oxalic acid (2APOX) were synthesized and crystallized successfully by solvent evaporation solution growth technique. The crystal packing is stabilized through intricate three dimensional hydrogen bonded network. Both, the molecular structures were optimized with Density Functional Theory (DFT) using B3LYP function and Hartree-Fock method with a 6-311++G(d,p) basis set. Optimized molecular parameters between the methods were compared for the cation showing appreciable agreement...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442876/characteristics-and-morphology-of-nanosilica-modified-with-isopropyl-tri-dioctyl-phosphate-titanate-coupling-agent
#20
Ho Ngoc Minh, Nguyen Thuy Chinh, Tran Thi Thanh Van, Dam Xuan Thang, Thai Hoang
In order to improve dispersiveness of nanosilica in polymer matrix, surface organo-modification of nanosilica is necessary. This work reveals silica nanoparticles modified by titanate coupling agent isopropyltri (dioctylphosphate) titanate (KR12) in toluene solvent. Effect of reaction temperature, reaction time and reactant ratio on grafting efficiency have been studied by Thermogravimetric Analysis (TGA). The obtained results exhibit the grafted percentage of titanate coupling agent KR-12 on the surface of nanosilica increased quickly from 4...
May 1, 2018: Journal of Nanoscience and Nanotechnology
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