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https://www.readbyqxmd.com/read/29453753/pediatric-astrocytic-tumor-grading-comparison-between-arterial-spin-labeling-and-dynamic-susceptibility-contrast-mri-perfusion
#1
Giovanni Morana, Domenico Tortora, Serena Staglianò, Paolo Nozza, Samantha Mascelli, Mariasavina Severino, Gianluca Piatelli, Alessandro Consales, Maarten Lequin, Maria Luisa Garrè, Andrea Rossi
PURPOSE: The aim of this study was to compare arterial spin labeling (ASL) and dynamic susceptibility contrast (DSC) MRI perfusion with respect to diagnostic performance in tumor grading in pediatric patients with low- and high-grade astrocytic tumors (AT). METHODS: We retrospectively analyzed 37 children with histologically proven treatment naive low- and high-grade AT who underwent concomitant pre-operative ASL and DSC MRI perfusion. Studies were performed on a 1...
February 16, 2018: Neuroradiology
https://www.readbyqxmd.com/read/29452493/in-vitro-and-in-vivo-evaluation-of-cyclodextrin-based-nanosponges-for-enhancing-oral-bioavailability-of-atorvastatin-calcium
#2
Mohamed F Zidan, Hany M Ibrahim, Mohsen I Afouna, Elsherbeny A Ibrahim
The aim of this study was to explore the feasibility of complexing the poorly water-soluble drug atorvastatin calcium (AC) with β-cyclodextrin (β-CD) based nanosponges (NS), which offer advantages of improving dissolution rate and eventually oral bioavailability. Blank NS were fabricated at first by reacting β-CD with the cross-linker carbonyldiimidazole at different molar ratios (1:2, 1:4 and 1:8), then NS of highest solubilization extent for AC were complexed with AC. AC loaded NS (AC-NS) were characterized for various physicochemical properties...
February 16, 2018: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29452154/study-of-petrolatum-structure-explaining-its-variable-rheological-behavior
#3
A J P van Heugten, J Landman, A V Petukhov, H Vromans
The rheological properties of petrolatum are dependent on both temperature and thermal history. How this thermal dependency can be explained is unclear. In the past it has been suggested that the structure of petrolatum consists of a three-dimensional crystalline network. This has been established using old microscopic techniques only. Therefore a study on the microstructure of petrolatum was conducted using rheometry, DSC, pulsed NMR, polarized light microscopy and synchrotron X-ray. The combination of these techniques show that petrolatum is composed of 21% solid material at room temperature...
February 13, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29451387/the-mystery-of-the-auin-1-1-phase-and-its-incommensurate-structural-variations
#4
Laura C Folkers, Arkadiy Simonov, Fei Wang, Sven Lidin
In this communication, the AuIn 1:1 phase ( Naturwissenschaften , 1953 , 40 , 437 , DOI: 10.1007/BF00590353 ), and its ordering behavior at various temperatures is investigated. To enable the growth of a X-ray suitable specimen, a tempering routine was established by the interpretation of a differential scanning calorimetry (DSC) study. In this way, good quality single crystals were grown and measured at the Crystal beamline at Synchrotron SOLEIL. From the acquired data, three variations of this structure could be found at temperatures of 400 °C and 300 °C and room temperature, with differing degrees of incommensurate modulation...
February 16, 2018: Inorganic Chemistry
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
#5
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/29448721/oxidation-and-tribological-behavior-of-ti-b-c-n-si-nanocomposite-films-deposited-by-pulsed-unbalanced-magnetron-sputtering
#6
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/29448629/synthesis-and-characterization-of-calcium-phosphate-ceramic-poly-vinyl-alcohol-polycaprolactone-bilayer-nanocomposites-a-bone-tissue-regeneration-scaffold
#7
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
β Tricalcium phosphate ceramic was used to reinforce nanofibers in composite mats produced via electrospinning of poly(vinyl alcohol) (PVA), polycaprolactone (PCL) and (PVA: PCL) bilayers. The role of TCP ceramic on morphology of nanocomposites, crystalline structure, functional groups and thermal behaviour of nanocomposites were characterized by SEM, EDAX, XRD, FTIR and DSC analysis. Ultrathin cross-sections of the obtained nanocomposites were morphologically investigated with SEM and all fabricated composites consisted of fibers with average fiber diameter (AFD) around 100 nm except PCL-TCP fibers having AFD in the range of 608 nm...
March 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
#8
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/29445228/a-study-on-curing-kinetics-of-nano-phase-modified-epoxy-resin
#9
Hailing Ma, Xin Zhang, Feifei Ju, Sang-Bing Tsai
In this paper, DSC curves at different heating rates were measured by DSC, the characteristic curing temperature was determined, and the optimum curing conditions were obtained. The KAS method, Friedman method and FWO method were used to analyze the DSC curves respectively. The kinetic parameters and the reaction mechanism function of the curing system were obtained, and the results of different analytical methods were compared and analyzed. Result from fitting and verification of the curing kinetic model for the curing system of the nano-phase modified epoxy resin further demonstrates that the nano-particle could play a catalytic role in the curing reaction of the epoxy resin and could reduce the apparent activation energy of the system, thus it is considered as a breakthrough in the field of resin research...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29445218/new-insights-into-gelatinization-mechanisms-of-cereal-endosperm-starches
#10
Shujun Wang, Chen Chao, Fengjuan Xiang, Xiu Zhang, Shuo Wang, Les Copeland
A thorough understanding of starch gelatinization is needed to control starch functional properties for food processing and human nutrition. Here, we reveal the mechanism of structural disassembly of rice, maize and wheat starch granules during thermal transitions in which a Rapid Visco Analyzer (RVA) was used to pre-heat the starches to certain transition points in the differential scanning calorimetry (DSC) heating profiles. This was done to generate sufficient material for structural analyses. The results from DSC, Raman, X-ray diffraction and scanning electron microscopy (SEM) analyses all showed that at the conclusion temperature (T c ) of the DSC endotherm rice starch gelatinization was complete, whereas residual structural order remained in maize and wheat starches...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29442963/improvement-of-mechanical-and-dielectric-properties-of-epoxy-resin-using-cnts-zno-nanocomposite
#11
Pham Gia Vu, Trinh Anh Truc, Nguyen Thuy Chinh, Do Quang Tham, Tran Huu Trung, Vu Ke Oanh, To Thi Xuan Hang, Marjorie Olivier, Thai Hoang
In this study, carbon nanotubes (CNTs)/ZnO composites had been prepared using the sol-gel method and then incorporated into an epoxy resin for reinforcement of mechanical and electrical properties. Fourier Transform Infrared (FTIR), X-ray diffraction (XRD) Field Emission Scanning Electron Microscope (FE-SEM) analyses show that the ZnO nanoparticles deposited on CNTs were crystallized in a hexagonal wurtzite structure. Average particle size of ZnO deposited on the CNT was about 8 nm. The mechanical and dielectric properties of epoxy containing CNTs/ZnO were investigated in comparison to epoxy resin and epoxy resin containing only CNT or ZnO nanoparticles...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442949/cu-nanoparticles-improved-thermal-property-of-form-stable-phase-change-materials-made-with-carbon-nanofibers-and-la-ma-sa-eutectic-mixture
#12
Xiaofei Song, Yibing Cai, Cong Huang, Ying Gu, Junhao Zhang, Hui Qiao, Qufu Wei
A novel form-stable phase change materials (FSPCMs) was fabricated by incorporating fatty acid eutectics with electrospun carbon nanofibers (CNFs) surface-attached with copper (Cu) nanoparticles. Three different Cu/CNFs mats were made through combining the technique and principle of electrospinning, pre-oxidation/carbonization and in-situ reduction, while lauric-myristic-stearic acid (LA-MA-SA) ternary eutectic mixture was prepared as the model PCM. The morphology and crystal structure of Cu/CNFs were characterized by Fourier transfer infrared (FT-IR) spectra, Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray energy dispersive spectroscopy (EDS), respectively...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442935/controlled-hydrothermal-synthesis-optical-and-magnetic-properties-of-monodisperse-leaf-like-ceo%C3%A2-nanosheets
#13
Xiaofei Niu, Xiuxiang Zhang, Yan Liu
The monodisperse leaf-like CeO2 nanosheets of about 40 nm in thickness have been successfully synthesized by a simple hydrothermal route. SEM, XRD, FT-IR, TG-DSC, XPS, Raman scattering, Photoluminescence (PL) spectra and M-H curves were employed to characterize the samples. The results showed that all the CeO2 samples had a cubic fluorite structure and there are Ce3+ ions and oxygen vacancies in the surface of samples. Based on the SEM patterns, a clear morphology transformation from leaf-like to heart-shaped, and then to triangular prism-like structure was observed...
April 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442780/crystalline-mechanical-and-dielectric-properties-of-polyarylene-ether-nitrile-with-multi-walled-carbon-nanotube-filled-with-polyarylene-ether-nitrile
#14
Qian Xiao, Ruiqi Yang, Yong You, Hongxing Zhang, Renbo Wei, Xiaobo Liu
Multi-walled carbon nanotube (MWCNT) filled with poly(arylene ether nitrile) (PEN) (PEN-in-MWCNT) is used as additive to improve the physical performances of PEN matrix. The influences of PEN-in-MWCNT on the crystallization, mechanical, dielectric and thermal properties of PEN are investigated by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), Fourier Transform Infrared Spectoscopy (FT-IR), dielectric testing, mechanical testing and scanning electron microscope (SEM) observation. The filling of the PEN into the MWCNT is confirmed by transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) observation, FT-IR spectra, TGA and DSC curves...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442730/assimilation-of-nh%C3%A2-br-in-polyvinyl-alcohol-poly-n-vinyl-pyrrolidone-polymer-blend-based-electrolyte-and-its-effect-on-ionic-conductivity
#15
V Parameswaran, N Nallamuthu, P Devendran, A Manikandan, E R Nagarajan
Biodegradable polymer blend electrolyte based on ammonium based salt in variation composition consisting of PVA:PVP were prepared by using solution casting technique. The obtained films have been analyzed by various technical methods like as XRD, FT-IR, TG-DSC, SEM analysis and impedance spectroscopy. The XRD and FT-IR analysis exposed the amorphous nature and structural properties of the complex formation between PVA/PVP/NH4Br. Impedance spectroscopy analysis revealed the ionic conductivity and the dielectric properties of PVA/PVP/NH4Br polymer blend electrolyte films...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442705/synthesis-of-nanocomposites-of-polypropylene-with-graphite-nanosheets-by-in-situ-polymerization-using-a-fourth-generation-ziegler-natta-catalyst
#16
Maria de Fatima V Marques, Renato J B Oliveira, Rafael S Araujo
Polypropylene nanocomposites with expanded graphite nanosheets (xGN) were synthesized by In Situ polymerization employing a Ziegler-Natta catalyst supported on particles of MgCl2 containing xGN (mass ratio 1:1) and internal electron donor to control isotacticity, and their properties were compared with those of neat polypropylene obtained using a prepared standard Ziegler-Natta catalyst. SEM micrographs showed an alteration in the morphology of the catalyst with nanoparticles when compared with the standard one...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442680/tensile-thermal-dielectric-and-morphological-properties-of-polyoxymethylene-silica-nanocomposites
#17
Tran Thi Mai, Nguyen Thuy Chinh, Rajesh Baskaran, Nguyen Thi Thu Trang, Vu Viet Thang, Dang Thi Thanh Le, Do Quang Minh, Thai Hoang
This paper presents the tensile, thermal, dielectric and morphological properties of composites based on polyoxymethylene (POM) and nanosilica (NS) prepared by melt mixing method at 190 °C. Based on the torque readings, the processing of POM/NS composites were found to be easier in comparison to only POM. The FT-IR spectra analysis of the POM/NS nanocomposites showed the presence of peak at approximately 910 cm-1, attributed to the Si-O and C-O groups in NS and POM on the POM/NS nanocomposite. The absorption at these peaks increased on gradually increasing the content of NS...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442650/electrospun-lifepo%C3%A2-c-composite-fiber-membrane-as-a-binder-free-self-standing-cathode-for-power-lithium-ion-battery
#18
Li-Li Chen, Xiang-Qian Shen, Mao-Xiang Jing, Sheng-Wen Zhu, Zhi-Chao Pi, Jing-Quan Li, Hong-Ai Zhai, Ke-Song Xiao
A LiFePO4/C composite fiber membrane was fabricated by the electrospinning method and subsequent thermal treatment. The thermal decomposition process was analyzed by TG/DSC, the morphology, microstructure and composition were studied using SEM, TEM, XRD, Raman, respectively. The results indicated that the prepared LiFePO4/C composite fibers were composed of nanosized LiFePO4 crystals and amorphous carbon coatings, which formed a three dimensional (3D) long-range networks, greatly enhanced the electronic conductivity of LiFePO4 electrode up to 3...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442126/synthesis-of-layered-double-hydroxide-poly-n-isopropylacrylamide-nanocomposite-hydrogels-with-excellent-mechanical-and-thermoresponsive-performances
#19
Yaping Zhang, Jingwen Ji, Haiping Li, Na Du, Shue Song, Wanguo Hou
Nanocomposite (NC) hydrogels of positively charged layered double hydroxide (LDH) single-layer nanosheet (SLNS) cross-linked poly(N-isopropylacrylamide) (PNIPAM) were synthesized. Especially, the LDH SLNSs used here were pre-synthesized via an aqueous synthetic route without using organic solvents and modifiers. The obtained LDH/PNIPAM NC hydrogels were characterized using XRD, SEM, TEM, and DSC. The mechanical and thermoresponsive properties were determined using tensile, compression, and swelling/deswelling tests...
February 14, 2018: Soft Matter
https://www.readbyqxmd.com/read/29441880/crystal-form-conversion-of-nevirapine-solvates-subjected-to-elevated-temperature-and-humidity-a-qualitative-study
#20
N Stieger, M R Caira, J C Wessels, W Liebenberg
Some known nevirapine solvates have been reported to undergo solvent exchange in aqueous media to form a stable hemihydrate. This study aimed to determine the effects of atmospheric moisture on said nevirapine solvates and to gain insight into which factors determine the end product of transformation. Solvates were prepared by solvent recrystallisation and stored, together with the anhydrous and hemihydrate forms, in a climate chamber at 40 °C and 75% RH for a period of 28 days. Samples were analyzed using DSC, TGA, FT-IR, PXRD and Karl Fischer titration...
October 1, 2017: Die Pharmazie
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