scholarly journals Comparison of Gelation Time and Polyalcohol Effect on Hydrogels from Domestic and Wild Silk Fibroins

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Huijing Zhao ◽  
Siyong Xiong ◽  
Mingzhong Li ◽  
Qiang Zhang ◽  
Guiyang Liu
Keyword(s):  
Bombyx Mori ◽  
Silk Fibroin ◽  
Gelation Time ◽  
X Ray Diffraction ◽  
Antheraea Pernyi ◽  
X Ray ◽  
Silk Fibroins ◽  
Ft Ir ◽  
Additional Formation ◽  
Ir And Raman

Silk fibroin (SF) hydrogels were obtained from both domestic (Bombyx mori) and wild (Antheraea pernyi) silkworms from aqueous silk fibroin solutions at room temperature. The gelation time of theAntheraea pernyi(A. pernyi) SF solution was significantly shorter than that of theBombyx mori(B. mori) SF solution. The secondary structures of the two kinds of hydrogels were also compared. In order to further reduce the gelation time, various amounts of polyethylene glycol (PEG) were blended with the silk fibroins ofA. pernyiandB. mori. The gelation time of bothA. pernyiSF andB. moriSF decreased with the increased amount of PEG. After freeze-drying, the hydrogels were characterized through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and Raman spectroscopy. Results showed that the addition of polyalcohol did not change the main secondary structure of the hydrogels. However, the addition of polyalcohol did reduce the gelation time and triggered additional formation ofβ-sheets.

scholarly journals Novel solid forms of the analgesic drug ethenzamide

2014 ◽  
Vol 70 (a1) ◽  
pp. C995-C995
Author(s):  
Duane Choquesillo-Lazarte ◽  
Cristóbal Verdugo-Escamilla ◽  
Juan Manuel García-Ruiz
Keyword(s):  
Polycrystalline Material ◽  
X Ray Diffraction ◽  
Analgesic Drug ◽  
X Ray ◽  
Solution Methods ◽  
Additional Stability ◽  
Ft Ir ◽  
Model Drug ◽  
Solid Form ◽  
Ir And Raman

The interest in multicomponent solid forms has increased in the last years within the pharmaceutical industry and also the solid-state community due to the possibility of obtaining materials with new properties [1]. Crystallization strategies, supported by solvent- and solid-based techniques, have also received attention in the search and development of methodologies for the screening of multicomponent crystals. In this work, ethenzamide, an anti-inflammatory and analgesic drug, was selected as a model drug to develop cocrystals on the basis of the synthon types using a series of phenolic coformers. Ethenzamide cocrystals and cocrystal solvates have been reported recently [2,3]. Liquid Assisted Grinding (LAG) and solution methods were used as synthetic tools. Attempts to produce cocrystals by LAG and Reaction Crystallization led to the formation of polycrystalline material. The solids obtained were then characterized by powder X-ray diffraction (PXRD), FT-IR and Raman spectroscopy. Recrystallization by slow solvent evaporation was carried out when the above-referred techniques strongly suggest the formation of a new solid form. The structure of five new multicomponent solids has been determined by single crystal X-ray diffraction. Additional stability studies have been performed at controlled relative humidity conditions and followed by PXRD.

scholarly journals Optical, Structural and Electrical Properties of Electrochemical Synthesis of Thin Film of Polyaniline

2018 ◽  
Vol 15 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Morphological Studies ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Structural And Electrical Properties ◽  
A Cell ◽  
Ft Ir ◽  
Ir And Raman

Polyaniline membranes of aniline were produced using an electrochemical method in a cell consisting of two poles. The effect of the vaccination was observed on the color of membranes of polyaniline, where analysis as of blue to olive green paints. The sanction of PANI was done by FT-IR and Raman techniques. The crystallinity of the models was studied by X-ray diffraction technique. The different electronic transitions of the PANI were determined by UV-VIS spectroscopy. The electrical conductivity of the manufactured samples was measured by using the four-probe technique at room temperature. Morphological studies have been determined by Atomic force microscopy (AFM). The structural studies have been measured by (SEM).

Preparation of Transparent Water-Insoluble Silk Fibroin Films

2011 ◽  
Vol 175-176 ◽  
pp. 79-84
Author(s):  
Min Qing Luo ◽  
Cen Cen Zhang ◽  
Shen Zhou Lu
Keyword(s):  
Mechanical Properties ◽  
Silk Fibroin ◽  
Light Transmittance ◽  
Human Cornea ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blend Films ◽  
Structure Surface ◽  
Ft Ir ◽  
Transparent Water

The transparent water-insoluble silk fibroin(SF) films were casted from the mixture solution of silk fibroin and xylitol/mannitol. The structure, surface morphology, solubility, mechanical properties and light transmittance of the blend films were measured. FT-IR, X-ray diffraction retuslts indicated that the films were mainly composed of Silk I structure. SEM showed the blend films with xylitol were miscible, whereas the blend films with mannitol had phase-separated structure. There were lots of nanopores in the blend films in the wet state. The insoluble SF /xylitol films had excellent mechanical properties while the SF / mannitol films were brittle. The mechanical property of SF/alcohol blend films were consistent with the human cornea in wet state.When the contents of xylitol were 10% and 20%, the blend films had high light transmittance which were similar to human cornea. In summary, the SF /xylitol film containing 10% xylitol provides a great potential to act as repairing materials for cornea.

Ultrasonication-Induced Rapid Gelation of Wild Silkworm Silk Fibroins

2013 ◽  
Vol 634-638 ◽  
pp. 1165-1169 ◽  
Author(s):  
Gui Yang Liu ◽  
Si Yong Xiong ◽  
Ren Chuan You ◽  
Ling Shuang Wang ◽  
Ming Zhong Li
Keyword(s):  
Secondary Structure ◽  
Silk Fibroin ◽  
Gelation Time ◽  
Random Coil ◽  
X Ray Diffraction ◽  
Freeze Dried ◽  
Silk Fibroins ◽  
Wild Silkworm ◽  
Α Helix ◽  
Silkworm Silk

Silk fibroin （SF） hydrogels of the wild silkworm species Antheraea pernyi and Antheraea yamamai were obtained from aqueous SF solutions at room temperature. Both A. pernyi and A. yamamai solutions were slow to gelate. Hydrogels of the two species of wild silkworm were obtained rapidly following ultrasonicaton at 400–500 W. The secondary structure of the freeze-dried SF hydrogels was measured by X-ray diffraction and Fourier transform infrared spectroscopy. Ultrasonication did not change the main secondary structure of the hydrogels, but it accelerated the structural transformation of silk fibroin molecules from random coil or α helix to β sheet and reduced the gelation time.

A Spectral and Structural Study of the New Cadmium Salt [(H2L)2][Cd2I6][(NO3)2]

2013 ◽  
Vol 68 (3) ◽  
pp. 272-276 ◽  
Author(s):  
Mohammad Hakimi ◽  
Zahra Mardani ◽  
Keyvan Moeini ◽  
Esther Schuh ◽  
Fabian Mohr
Keyword(s):  
Chair Conformation ◽  
Cyclohexene Oxide ◽  
X Ray Diffraction ◽  
Intermolecular Hydrogen Bonds ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry ◽  
Ft Ir ◽  
Ir And Raman ◽  
Cadmium Salt

The reaction between 2-(piperazin-1-yl)ethanol and cyclohexene oxide under microwave irradiation gave 2-(4-(2-hydroxyethyl)piperazin-1-yl)cyclohexanol (L). The new cadmium salt [(H2L)2][Cd2I6][(NO3)2] (1) was prepared from the reaction of cadmium iodide with L and identified by elemental analysis, FT-IR and Raman spectroscopy, and single-crystal X-ray diffraction. In the crystal structure of 1, there is a [Cd2I6]2- dianion with distorted tetrahedral geometry for each cadmium atom. The piperazine and cyclohexane rings in 1 have a chair conformation. In the crystal there are several intermolecular hydrogen bonds including N-H···O, O-H···O, O-H···I, C-H···O, and C-H···I interactions.

Preliminary Research on the Uptake Behavior of Ammonium Molybdophosphate for Cesium and the Corresponding Structural Transformation

2012 ◽  
Vol 535-537 ◽  
pp. 2191-2194 ◽  
Author(s):  
Zhao Ya Huang ◽  
Dong Zhang ◽  
Zhao Yi Tan
Keyword(s):  
Exchange Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ammonium Molybdophosphate ◽  
Before And After ◽  
Initial Ph ◽  
Negative Effect ◽  
Ft Ir ◽  
Ph Conditions ◽  
Ir And Raman

In this work, Ammonium Molybdophosphate (AMP) was synthesized and the adsorption of Cs onto it under different initial pH conditions was investigated. The results show the negative effect of the hydronium and hydroxyl irons on the uptake of Cs while the iron-exchange capacity can reach 144.8 mg/g. In addition, the structure differences between AMP samples before and after Cs adsorption were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Raman technique. The results show that the Keggin structure of AMP stayed unchanged while new bonds arose after the Cs adsorption.

High Functional Silk Fibroin Polyester Fabric

2011 ◽  
Vol 332-334 ◽  
pp. 799-803
Author(s):  
Gang Xian Zhang ◽  
Nan Han ◽  
Wei Hu ◽  
Feng Xiu Zhang
Keyword(s):  
Silk Fibroin ◽  
Glycidyl Ether ◽  
Polyester Fabric ◽  
Air Permeability ◽  
Sucrose Ester ◽  
X Ray Diffraction ◽  
Softening Function ◽  
X Ray ◽  
Polyester Fibers ◽  
Ft Ir

Though polyester fabric has favorable characteristics, it is not comfortable to wear because of its hydrophobic characteristics Silk fibroin has lots of polar and electric groups, and its biocompatible is very good. In this paper polyester fabric was encased sucrose ester to endue polyester fibers lots of –OH, then sucrose eater glycidyl ether (SEGE) which not only had crosslink function but also had softening function was used to graft silk fibroin on polyester fabric. FT-IR spectra showed silk fibroin was grafted on polyester fabric; DSC showed thermostability of fabric kept very well; X-ray diffraction spectra showed the structure of some silk fibroin grafted on polyester fabric was -sheet. With the increase of grafting rate of silk fibroin on polyester fabric, the broken strength of polyester fabric grafted silk fibroin did not decrease; cockle elastics kept very well; antistatic property and moisture regain increased greatly, whiteness and air permeability kept very well and fabric was still soft enough. The polyester fabric grafted silk fibroin was high functional.

Synthesis, Characterization and Dielectric Properties of Mn(2-x)ZnxP2O7 Ceramics

2013 ◽  
Vol 802 ◽  
pp. 12-16
Author(s):  
Manoon Sutapun ◽  
Rangson Muanghlua ◽  
Surasak Niemcharoen ◽  
Wanwilai C. Vittayakorn ◽  
Panpailin Seeharaj ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Monoclinic Phase ◽  
Ion Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Manganese Zinc ◽  
Ft Ir ◽  
Ir And Raman ◽  
Sintering Method ◽  
Scanning Electron

Manganese zinc pyrophosphate (Mn(2-x)ZnxP2O7 when x = 0.0, 0.5, 1.0, 1.5 and 2.0) ceramics were fabricated by conventionally mixing oxide using the normal sintering method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Raman spectroscopy and scanning electron microscopy (SEM). The XRD results indicated that synthesized Mn(2-x)ZnxP2O7 systems have a pure monoclinic phase without the presence of phase impurities. The lattice parameters and crystalline sizes analyzed from XRD data were changed depending on the amount of added Zn2+ ion concentration in the Mn2P2O7 structure. The FT-IR and Raman results showed the fundamental vibrations of P2O74-ion and Mn-O or Zn-O, which confirmed the Mn(2-x)ZnxP2O7 formation. In addition, dielectric stability of temperature and frequency was observed in the composition, x = 1.0, with a dielectric constant value of 11.5 at 1 MHz.

scholarly journals (E,E)-3-Methyl-2,5-bis(4-methylbenzylidene)cyclopentanone: synthesis, characterization, Hirshfeld surface analysis and antibacterial activity

2019 ◽  
Vol 75 (4) ◽  
pp. 506-511
Author(s):  
Fatiha Mahdi ◽  
Assia Sid ◽  
Rafika Bouchene ◽  
Paul Mosset ◽  
Thierry Roisnel
Keyword(s):  
Surface Analysis ◽  
New Product ◽  
Hirshfeld Surface ◽  
Hirshfeld Surface Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Non Covalent Interactions ◽  
Covalent Interactions ◽  
Ir And Raman

The title compound, (E,E)-3-methyl-2,5-bis(4-methylbenzylidene)cyclopentanone (MBMCP), C22H22O, was obtained by Claisen–Schmidt condensation of 4-methylbenzaldehyde with 3-methylcyclopentanone in good yield. The structure of MBMCP was studied using UV, FT–IR and Raman spectroscopy, single-crystal X-ray diffraction (XRD) measurements, and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. The molecular structure of MBMCP is fully extended in the E,E configuration. C—H...π stacking interactions play a significant role in the stabilization of the molecular packing. Hirshfeld surface analysis was used to quantify the non-covalent interactions in the crystal lattice. Microbiological studies were performed to investigate the antimicrobial activity of this new product.

scholarly journals Synthesis and Mechanism of Tetracalcium Phosphate from Nanocrystalline Precursor

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Jianguo Liao ◽  
Xingze Duan ◽  
Yanqun Li ◽  
Caifeng Zheng ◽  
Zhengpeng Yang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Calcination Temperature ◽  
X Ray Diffraction ◽  
Tetracalcium Phosphate ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ir And Raman ◽  
Cooling Methods

Tetracalcium phosphate (TTCP, Ca4(PO4)2O) was prepared by the calcination of coprecipitated mixture of nanoscale hydroxyapatite (HA, Ca10(PO4)6(OH)2) and calcium carbonate crystal (CaCO3), followed by cooling in the air or furnace. The effect of calcination temperature on crystal structure and phase composition of the coprecipitation mixture was characterized by transmission electron microscope (TEM), thermal analysis-thermogravimetry (DTA-TG), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), and Raman spectroscopy (RS). The obtained results indicated that the synthesized mixture consisted of nanoscale HA and CaCO3with uniform distribution throughout the composite. TTCP was observed in the air quenching samples when the calcination temperature was above 1185°C. With the increase of the calcination temperature, the amount of the intermediate products in the air quenching samples decreased and cannot be detected when calcination temperature reached 1450°C. Unexpectedly, the mixture of HA and calcium oxide was observed in the furnace cooling samples. Clearly, the calcination temperature and cooling methods are critical for the synthesis of high-purity TTCP. The results indicate that the nanosize of precursors can decrease the calcination temperature, and TTCP can be calcinated by low temperature.

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