Introducing a Novel Approach for Oil‐oil Correlation based on Asphaltene Structure: X‐ray Diffraction

2021 ◽  
Author(s):  
Zahra Sadeghtabaghi ◽  
Ahmad Reza Rabbani ◽  
Abdolhossein Hemmati‐Sarapardeh
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Novel Approach ◽  
Asphaltene Structure

scholarly journals Multiscale Copper-µDiamond Nanostructured Composites

2012 ◽  
Vol 730-732 ◽  
pp. 925-930
Author(s):  
Daniela Nunes ◽  
Vanessa Livramento ◽  
Horácio Fernandes ◽  
Carlos Silva ◽  
Nobumitsu Shohoji ◽  
...  
Keyword(s):  
Pure Copper ◽  
Thermal Stabilization ◽  
Hot Extrusion ◽  
Processing Parameters ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimal Processing ◽  
Novel Approach ◽  
Transmission Electron

Nanostructured copper-diamond composites can be tailored for thermal management applications at high temperature. A novel approach based on multiscale diamond dispersions is proposed for the production of this type of materials: a Cu-nDiamond composite produced by high-energy milling is used as a nanostructured matrix for further dispersion of micrometer sized diamond. The former offers strength and microstructural thermal stability while the latter provides high thermal conductivity. A series of Cu-nDiamond mixtures have been milled to define the minimum nanodiamond fraction suitable for matrix refinement and thermal stabilization. A refined matrix with homogenously dispersed nanoparticles could be obtained with 4 at.% nanodiamond for posterior mixture with mDiamond and subsequent consolidation. In order to define optimal processing parameters, consolidation by hot extrusion has been carried out for a Cu-nDiamond composite and, in parallel, for a mixture of pure copper and mDiamond. The materials produced were characterized by X-ray diffraction, scanning and transmission electron microscopy and microhardness measurements.

scholarly journals Engineering cocrystals of Paliperidone with enhanced solubility and dissolution characteristics

2021 ◽  
Vol 71 (5) ◽  
pp. 393-409
Author(s):  
Earle Radha-Rani ◽  
Gadela Venkata-Radha
Keyword(s):  
Benzoic Acid ◽  
Aqueous Solubility ◽  
Water Soluble ◽  
X Ray Diffraction ◽  
X Ray ◽  
Water Soluble Drug ◽  
Novel Approach ◽  
Enhanced Solubility ◽  
Poorly Water Soluble ◽  
Poorly Water Soluble Drug

In the present study, co-crystals (CCs) of Paliperidone (PPD) with coformers like benzoic acid (BA) and P-amino benzoic acid (PABA) were synthesized and characterized to improve the physicochemical properties and dissolution rate. CCs were prepared by the solvent evaporation (SE) technique and were compared with the products formed by neat grinding (NG) and liquid assisted grinding (LAG) in their enhancement of solubility. The formation of CCs was confirmed by the IR spectroscopy, powder X-ray diffraction and thermal analysis methods. The saturation solubility studies indicate that the aqueous solubility of PPD-BA and PPD-PABA CCs was significantly improved to 1.343±0.162mg/ml and 1.964±0.452mg/ml, respectively, in comparison with the PPD solubility of 0.473mg/ml. This increase in solubility is 2.83-and 3.09-fold, respectively. PPD exhibited a poor dissolution of 37.8% in 60min, while the dissolution of the CCs improved tremendously to 96.07% and 89.65% in 60min. CCs of PPD with BA and PABA present a novel approach to overcome the solubility challenges of poorly water-soluble drug PPD.

Dynamics of the nanocrystal structure and composition in growth solutions monitored by in situ lab-scale X-ray diffraction

Nanoscale ◽  
2021 ◽  
Author(s):  
Helena Fridman ◽  
Michael Volokh ◽  
Taleb Mokari
Keyword(s):  
Real Time ◽  
Growth Dynamics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanocrystal Growth ◽  
Novel Approach ◽  
Phase Size ◽  
Time Observation ◽  
Real Time Observation

Nanocrystal growth dynamics are investigated by a novel approach: real-time observation of nanocrystals in growth solutions using lab-scale in situ X-ray diffraction. The method reveals the evolution of crystal phase, size, shape, and composition.

A Novel Approach to Unzipped Tubes Synthesis Using Sulfanilic Acid as the Backbone Amino Acid

2019 ◽  
Vol 57 ◽  
pp. 17-30
Author(s):  
Christopher Narh ◽  
Charles Frimpong ◽  
Qu Fu Wei
Keyword(s):  
Differential Scanning Calorimetry ◽  
Bond Formation ◽  
Sulfanilic Acid ◽  
Test Results ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Torsion Angles ◽  
X Ray ◽  
Novel Approach ◽  
Hydrophobic Peptide

In this research, unzipped sulfanilic acid inspired hydrophobic peptide tube was synthesis by increasing the polarity of sulfanilic acid through nucleophilic attachment of aniline which then provided two reactive sites at the S-terminus. These two sites were then attached with the N-terminal of valine and alanine respectively at an intensity of 1000-1600 of 11 2θ (°). Through π-π stacking at the side chains, the opened ended peptide was linearly arranged to form the unzipped tube. Fourier transform infrared spectroscopy (FTIR) confirm the amine bond formation whiles X-ray diffraction test results confirmed D-spacing 7.36 and 4.44 corresponding 2θ (°)12 and 19.97 respectively whiles the torsion angles (Ø2) conformations was between-150.5°and-169.2° and-2 between-129.0° and-150.6°. The Thermogravimetric analysis result showed an increase in the rigidity of the bond with an increasing intensity. Finally, Differential scanning calorimetry (DSC) test was carried out to confirm the crystallinity of the structure. Keywords: Sulfanilic acid, hydrophobic Peptide, Unzipped tubes, Nanomaterial

scholarly journals Enhanced Photodegradation Stability in Poly(butylene adipate-co-terephthalate) Composites Using Organically Modified Layered Zinc Phenylphosphonate

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1968 ◽  
Author(s):  
Jie-Mao Wang ◽  
Hao Wang ◽  
Erh-Chiang Chen ◽  
Yun-Ju Chen ◽  
Tzong-Ming Wu
Keyword(s):  
Composite Materials ◽  
Gel Permeation Chromatography ◽  
Uv Protection ◽  
X Ray Diffraction ◽  
Yellowness Index ◽  
X Ray ◽  
Novel Approach ◽  
Uv Photodegradation ◽  
Organically Modified ◽  
The Fourier Transform

The enhancement of the ultraviolet (UV) photodegradation resistance of biodegradable polymers can improve their application efficacy in a natural environment. In this study, the hexadecylamine modified layered zinc phenylphosphonate (m-PPZn) was used as a UV protection additive for poly(butylene adipate-co-terephthalate) (PBAT) via solution mixing. The results from the Fourier transform infrared spectroscopy (FTIR) and wide-angle X-ray diffraction analysis of the m-PPZn indicated the occurrence of hexadecylamine intercalation. FTIR and gel permeation chromatography were used to characterize the evolution of the PBAT/m-PPZn composites after being artificially irradiated via a light source. The various functional groups produced via photodegradation were analyzed to illustrate the enhanced UV protection ability of m-PPZn in the composite materials. From the appearance, the yellowness index of the PBAT/m-PPZn composite materials was significantly lower than that of the pure PBAT matrix due to photodegradation. These results were confirmed by the molecular weight reduction in PBAT with increasing m-PPZn content, possibly due to the UV photon energy reflection by the m-PPZn. This study presents a novel approach of improving the UV photodegradation of a biodegradable polymer using an organically modified layered zinc phenylphosphonate composite.

CT-guided aspiration cytology of advanced silicosis and confirmation of the deposited zeolite nano particles through X ray diffraction: A novel approach

2016 ◽  
Vol 44 (3) ◽  
pp. 246-249
Author(s):  
Arghya Bandyopadhyay ◽  
Kaushik Majumdar ◽  
Abhijit Chakraborty ◽  
Partha Mitra ◽  
Subhomoy Nag
Keyword(s):  
Nano Particles ◽  
X Ray Diffraction ◽  
Aspiration Cytology ◽  
Ct Guided ◽  
X Ray ◽  
Novel Approach

Photoelectrochemical Activity of Cu-Loaded TiO2 Nanotube Arrays by AC Electrodeposition

2014 ◽  
Vol 602-603 ◽  
pp. 980-984 ◽  
Author(s):  
Jian Ling Zhao ◽  
Qiao Wen Fan ◽  
Ying Juan Mi ◽  
Jing Yang ◽  
Xi Xin Wang
Keyword(s):  
Nanotube Arrays ◽  
X Ray Diffraction ◽  
Photoelectrochemical Property ◽  
Photoelectrochemical Activity ◽  
Solution Deposition ◽  
X Ray ◽  
Cu Content ◽  
Novel Approach ◽  
Deposition Voltage ◽  
Scanning Electron

This work presents a novel approach for preparing Cu-loaded TiO2 nanotube arrays through alternating current electrodeposition. The Cu content loaded on the arrays was controlled by changing the concentration of Cu (NO3)2 solution, deposition voltage and time. The surface morphology and crystal structure of Cu-loaded TiO2 nanotube arrays were characterized by scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The effects of Cu content on the photoelectrochemical property were studied in detail. Results show that Cu-loaded TiO2 nanotube arrays have evidently enhanced photoelectrochemical activity. The photocurrent of Cu-loaded TiO2 nanotube arrays prepared in 0.00625 mol/L Cu (NO3)2 solution at 12 V for 20 seconds was 5.7 and 2.3 times as that of unloaded TiO2 nanotube arrays under visible and UV radiation, respectively.

scholarly journals Hot Extrusion of ZnSb-Based Thermoelectric Materials; A Novel Approach for Scale-Up Production

2019 ◽  
Vol 3 (3) ◽  
pp. 58
Author(s):  
Mohsen K. Keshavarz ◽  
Chun-Wan Timothy Lo ◽  
Sylvain Turenne ◽  
Yurij Mozharivskyj ◽  
Nathaniel J. Quitoriano
Keyword(s):  
Thermoelectric Materials ◽  
High Purity ◽  
Microstructural Analysis ◽  
Scale Up ◽  
Hot Extrusion ◽  
Bulk Sample ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Novel Approach

Hot extrusion is employed to produce bulk ZnSb and Zn13Sb10 thermoelectric materials. The extrusion parameters are optimized to achieve high purity products with high density and acceptable mechanical strength for further fabrication processing. Microstructural analysis is performed to investigate the products. X-ray diffraction, energy dispersive X-ray spectroscopy, and differential scanning calorimetry show high stability of the ZnSb phase during the extrusion that lead to high purity products. However, the Zn13Sb10 compound decomposes during the extrusion, yielding a bulk sample consisting of several other phases. Hot extrusion shows a great potential for scaled up production of high quality ZnSb thermoelectric materials.

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