scholarly journals Foaming of Polycaprolactone and Its Impregnation with Quercetin Using Supercritical CO2

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1390 ◽  
Author(s):  
Ignacio García-Casas ◽  
Antonio Montes ◽  
Diego Valor ◽  
Clara Pereyra ◽  
Enrique J. Martínez de la Ossa
Keyword(s):  
Electron Microscopy ◽  
Supercritical Co2 ◽  
The Other ◽  
Heterogeneous Structure ◽  
Significant Delay ◽  
Scanning Calorimetry ◽  
Foam Structure ◽  
X Ray ◽  
Scanning Electron

Foamed polycaprolactone impregnated with quercetin was carried out with a batch foaming technique using supercritical CO2. The experimental design was developed to study the influence of pressure (15–30 MPa), temperature (308–333 K), and depressurization rate (0.1–20) on the foam structure, melting temperature, and release tests of composites. The characterization of the experiments was carried out using scanning electron microscopy, X-ray diffractometer, and differential scanning calorimetry techniques. It was observed that the porosity created in the polymer had a heterogeneous structure, as well as the impregnation of the quercetin during the process. On the other hand, controlled release tests showed a significant delay in the release of quercetin compared to commercial quercetin.

The Preparation and Characterization of Inclusion Complex of Ursolic Acid with γ-Cyclodextrin

2011 ◽  
Vol 403-408 ◽  
pp. 712-716 ◽  
Author(s):  
Wei Zong ◽  
Su Mei Bi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Inclusion Complex ◽  
Inclusion Complexes ◽  
Ursolic Acid ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Grinding Method ◽  
Scanning Electron

In order to increase the solubility of ursolic acid, the inclusion complexes of ursolic acid with γ-cyclodextrin were prepared by grinding, ultrasonic and stirring methods. The characterizations of the inclusion complexes were proved by x-ray powder diffraction, fourier transform infrared spectroscopy, differential scanning calorimetry and scanning electron microscopy. The results confirmed the interactions of ursolic acid with γ-cyclodextrin, indicating the formation of the inclusion complexes. In addition, grinding method is a better way of preparing inclusion complex of ursolic acid with γ-cyclodextrin.

Synthesis, Characterization, and Reactivity of Feitknechtite

1996 ◽  
Vol 431 ◽  
Author(s):  
J. Luo ◽  
S. R. Segal ◽  
J. Y. Wang ◽  
Z. R. Tian ◽  
S. L. Suib
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Layered Material ◽  
Tunnel Structure ◽  
Octahedral Layer ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Average Oxidation State ◽  
Scanning Electron

AbstractThe synthesis of Mg2+ doped β-MnOOH which is known as feitknechtite is reported. Feitknechtite is a layered material having the Cd12 structure. The characterization of Mg2+ doped feitknechtite was done with X-ray powder diffraction, elemental analysis, energy dispersive X-ray analysis, scanning electron microscopy, alternating current (AC) impedance, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, average oxidation state titrations of manganese, and acidity measurements. The formation of feitknechtite is related to the MnO4−/Mn2+ ratio used in the synthesis. Feitknechtite can be converted to synthetic birnessite or octahedral layer birnessite (OL-1) which is a precursor to the 6.9 Å tunnel structure material todorokite.

Preparation and Characterization of Ta3N5 Nanoparticles

2007 ◽  
Vol 352 ◽  
pp. 129-132
Author(s):  
Qing Hong Zhang ◽  
Lian Gao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
The One ◽  
Nitrogen Contents ◽  
Scanning Electron

In this paper, we reported the preparation of nanocrystalline Ta3N5 particles by nitridation of Ta2O5 nanoparticles using NH3 as reactant gas. It was found that nanocrystalline Ta2O5 was converted into Ta3N5 completely at 700°C within 5.0 h, which was much lower than the temperature 850°C for the complete nitridation of micron-sized Ta2O5 powder. The resulting nitride was characterized by X-ray diffraction analysis (XRD) and field emission scanning electron microscopy (FE-SEM). The nitrogen contents in the prepared Ta3N5 powders were quantitatively determined with CHN elemental analyzer and thermogravimetry and differential scanning calorimetry (TG-DSC). The color of nanocrystalline Ta3N5 is in fresh red while the one of micrometer-sized Ta3N5 is in dark red.

Preparation and Characterization of New Oxyfluoride Phases (Ba,Na)(Ti,Mg)(O,F)

2010 ◽  
Vol 62 ◽  
pp. 101-106 ◽  
Author(s):  
Djahida Talantikite-Touati ◽  
Laldja Benzïada
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Free Atmosphere ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Scanning Electron

Oxyfluoride phases have been synthesized in free atmosphere, using the initially synthesized perovskite BaTiO3 and the fluorides NaF and MgF2. The purity of BaTiO3 and oxyfluorides has been checked by X–Ray diffraction (XRD).The microstructures of these phases are observed by scanning electron microscopy. The phase transitions have been investigated by dielectric measurements and differential scanning calorimetry (DSC).

scholarly journals Characterization of a Mahamayuri Vidyarajni Sutra excavated in Lu’an, China

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Liu Liu ◽  
Decai Gong ◽  
Zhengquan Yao ◽  
Liangjie Xu ◽  
Zhanyun Zhu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tang Dynasty ◽  
Optical Microscope ◽  
Lead White ◽  
Scientific Methods ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Scanning Electron

Abstract Historically, sutras played an important role in spreading Buddhist faith and doctrine, and today these remain important records of Buddhist thought and culture. A Mahamayuri Vidyarajni Sutra with polychrome paintings was found inside the cavity on top of the Nanmen Buddhist pagoda, built in the early Tang dynasty (618–627 CE) and located in Anhui Province, China. Textile was found on the preface which is strongly degraded and fragile. Unfortunately, the whole sutra is under severe degradation and is incomplete. Technical analysis based on scientific methods will benefits the conservation of the sutra. Optical microscopy (OM), micro-Raman spectroscopy combined with optical microscope (Raman), scanning electron microscopy in combination with energy dispersive X-ray analysis (SEM–EDS) and Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the pigment and gilded material, as well as the paper fiber and textile. Pigments such as cinnabar, minium, paratacamite, azurite, lead white were found. Gilded material was identified as gold. A five-heddle warp satin, made of silk, was found as the textile on the preface of the sutra. The sutra’s preface and inner pages were made of paper comprised of bamboo and bark. As a magnificent yet recondite treasure of Buddhism, the sutra was analyzed for a better understanding of the material. A conservation project of the sutra will be scheduled accordingly.

Preliminary Preparation and Characterization Studies of Cellulose from Merbau (Intsia bijuga)

2012 ◽  
Vol 620 ◽  
pp. 314-319
Author(s):  
Nur Amira Mamat Razali ◽  
Fauziah Abdul Aziz ◽  
Saadah Abdul Rahman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Alkaline Treatment ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preliminary Preparation ◽  
Characterization Studies ◽  
Scanning Electron

Hardwood is wood from angiosperm trees. The characteristic of hardwood include flowers, endosperm within seeds and the production of fruits that contain the seeds. This paper aims to discuss the preparation and characterization of cellulose obtained from hardwood. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Alkaline treatment and delignification methods were used for the preparation of cellulose. Acid hydrolysis was employed to produce cellulose nanocrystal (CNC). The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The final product, from both trated and untreated samples were then compared.

Research on compatibility and surface of high impact bio-based polyamide

2021 ◽  
pp. 095400832110055
Author(s):  
Yang Wang ◽  
Yuhui Zhang ◽  
Yuhan Xu ◽  
Xiucai Liu ◽  
Weihong Guo
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Crystallization Behavior ◽  
High Impact ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Scanning Electron

The super-tough bio-based nylon was prepared by melt extrusion. In order to improve the compatibility between bio-based nylon and elastomer, the elastomer POE was grafted with maleic anhydride. Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis (TGA) were used to study the compatibility and micro-distribution between super-tough bio-based nylon and toughened elastomers. The results of mechanical strength experiments show that the 20% content of POE-g-MAH has the best toughening effect. After toughening, the toughness of the super-tough nylon was significantly improved. The notched impact strength was 88 kJ/m2 increasing by 1700%, which was in line with the industrial super-tough nylon. X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC) were used to study the crystallization behavior of bio-based PA56, and the effect of bio-based PA56 with high crystallinity on mechanical properties was analyzed from the microstructure.

Hydrothermal Synthesis and Characterization of BiFeO3 Polyhedral Crystallites

2012 ◽  
Vol 174-177 ◽  
pp. 508-511
Author(s):  
Lin Lin Yang ◽  
Yong Gang Wang ◽  
Yu Jiang Wang ◽  
Xiao Feng Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

BiFeO3 polyhedrons had been successfully synthesized via a hydrothermal method. The as-prepared products were characterized by power X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The possible mechanisms for the formation of BiFeO3 polyhedrons were discussed. Though comparison experiments, it was found that the kind of precursor played a key role on the morphology control of BiFeO3 crystals.

Characterization of Al65.0Cu32.9Co2.1 Alloy Containing Nanofibres

2012 ◽  
Vol 186 ◽  
pp. 212-215
Author(s):  
Jacek Krawczyk ◽  
Włodzimierz Bogdanowicz ◽  
Grzegorz Dercz ◽  
Wojciech Gurdziel
Keyword(s):  
Electron Microscopy ◽  
Average Diameter ◽  
Chemical Compositions ◽  
X Ray ◽  
Transmission Electron ◽  
Orthogonal Set ◽  
T Phase ◽  
Terminal Area ◽  
Scanning Electron

Microstructure of terminal area of Al65Cu32.9Co2.1ingots (numbers indicate at.%), obtained via directional solidification was studied. Scanning Electron Microscopy, Transmission Electron Microscopy and X-ray powder diffraction were applied. Point microanalysis by Scanning Electron Microscope was used for examination of chemical compositions of alloy phases. It was found that tetragonal θ phase of Al2Cu stoichiometric formula was the dominate phase (matrix). Additionally the alloy contained orthogonal set of nanofibres of Al7Cu2Co T phase with the average diameter of 50-500 nm and oval areas of hexagonal Al3(Cu,Co)2H-phase, surrounded by monoclinic AlCu η1phase rim. Inside some areas of H-phase cores of decagonal quasicrystalline D phase were observed.

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