scholarly journals Synthesis and physical properties of biodegradable nanocomposites fabricated using acrylic acid-grafted poly(butylene carbonate-co-terephthalate) and organically-modified layered zinc phenylphosphonate

2021 ◽  
Author(s):  
Yi-Fang Lee ◽  
Tzong-Ming Wu
Keyword(s):  
Acrylic Acid ◽  
Photoelectron Spectroscopy ◽  
Covalent Bond ◽  
Interlayer Spacing ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Nuclear Magnetic Resonance Spectra ◽  
Organically Modified ◽  
Biodegradable Nanocomposites

Abstract A set of novel biocompatible aliphatic-aromatic nanocomposites, including numerous acrylic acid-grafted poly(butylene carbonate-co-terephthalate) (g-PBCT) and organically-modified layered zinc phenylphosphonate (m-PPZn), were successfully synthesized via polycondensation and transesterification. A primary covalent linkage was produced between the biocompatible polymer and the inorganic reinforcements. Fourier transform infrared spectroscopy and 13C-nuclear magnetic resonance spectra demonstrated the successful grafting of acrylic acid into the PBCT (g-PBCT). Both wide-angle X-ray diffraction data and X-ray photoelectron spectroscopy analysis showed that the g-PBCT polymer matrix was intercalated into the interlayer spacing of the m-PPZn and was chemically interacted with the m-PPZn. The addition of m-PPZn in the g-PBCT matrix significantly improved its storage modulus. A slight increase in thermal stability was observed in all the g-PBCT/m-PPZn composites. Both results are attributed to the presence of covalent bond between g-PBCT and m-PPZn.

scholarly journals Synthesis, Physical Properties and Enzymatic Degradation of Biodegradable Nanocomposites Fabricated Using Poly(Butylene Carbonate-Co-Terephthalate) and Organically Modified Layered Zinc Phenylphosphonate

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2149
Author(s):  
Li-Ying Tseng ◽  
Erh-Chiang Chen ◽  
Jie-Mao Wang ◽  
Tzong-Ming Wu
Keyword(s):  
Nmr Spectra ◽  
Enzymatic Degradation ◽  
Molar Ratio ◽  
Wide Angle ◽  
Mixing Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Organically Modified ◽  
Biodegradable Nanocomposites

A new biodegradable aliphatic-aromatic poly (butylene carbonate-co-terephthalate) (PBCT-85) with the molar ratio [BC]/[BT] = 85/15, successfully synthesized through transesterification and polycondensation processes, was identified using 1H-NMR spectra. Various weight ratios of PBCT/organically modified layered zinc phenylphosphonate (m-PPZn) nanocomposites were manufactured using the solution mixing process. Wide-angle X-ray diffraction and transmission electron microscopy were used to examine the morphology of PBCT-85/m-PPZn nanocomposites. Both results exhibited that the stacking layers of m-PPZn were intercalated into the PBCT-85 polymer matrix. The additional m-PPZn into PBCT-85 copolymer matrix significantly enhanced the storage modulus at −70 °C, as compared to that of neat PBCT-85. The lipase from Pseudomonas sp. was used to investigate the enzymatic degradation of PBCT-85/m-PPZn nanocomposites. The weight loss decreased as the loading of m-PPZn increased, indicating that the existence of m-PPZn inhibits the degradation of the PBCT-85 copolymers. This result might be attributed to the higher degree of contact angle for PBCT-85/m-PPZn nanocomposites. The PBCT-85/m-PPZn composites approved by MTT assay are appropriate for cell growth and might have potential in the application of biomedical materials.

Preparation and characterization of CuInS2 nanorods and nanotubes from an elemental solvothermal reaction

2001 ◽  
Vol 16 (10) ◽  
pp. 2805-2809 ◽  
Author(s):  
Yang Jiang ◽  
Yue Wu ◽  
Shengwen Yuan ◽  
Bo Xie ◽  
Shuyuan Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Electron Transfer Reaction ◽  
Solvothermal Reaction ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Transmission Electron

A simple and convenient solvothermal reaction has been developed to produce CuInS2 nanorods and nanotubes from the elements in ethylenediamine at 280 °C. The products were characterized by x-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, scanning electron microscopy, and x-ray photoelectron spectroscopy. Analysis shows that the coordinating ability of ethylenediamine and the existence of liquid In may play important roles in the growth of one-dimension nanocrystallites and the electron-transfer reaction. In addition, spherical CuInS2 micrometer particles were obtained at 350 °C.

scholarly journals Covalent Functionalization of Graphene Oxide with Fructose, Starch, and Micro-Cellulose by Sonochemistry

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 490
Author(s):  
María Montserrat Cruz-Benítez ◽  
Pablo Gónzalez-Morones ◽  
Ernesto Hernández-Hernández ◽  
José Roberto Villagómez-Ibarra ◽  
Javier Castro-Rosas ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Organic Molecules ◽  
Chemical Characterization ◽  
Covalent Bond ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ultrasound Waves ◽  
Short Time

In this work, we report the synthesis of graphene oxide (GO) nanohybrids with starch, fructose, and micro-cellulose molecules by sonication in an aqueous medium at 90 °C and a short reaction time (30 min). The final product was washed with solvents to extract the nanohybrids and separate them from the organic molecules not grafted onto the GO surface. Nanohybrids were chemically characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy and analyzed by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). These results indicate that the ultrasound energy promoted a chemical reaction between GO and the organic molecules in a short time (30 min). The chemical characterization of these nanohybrids confirms their covalent bond, obtaining a grafting percentage above 40% the weight in these nanohybrids. This hybridization creates nanometric and millimetric nanohybrid particles. In addition, the grafted organic molecules can be crystallized on GO films. Interference in the ultrasound waves of starch hybrids is due to the increase in viscosity, leading to a partial hybridization of GO with starch.

Study on Preparation Process of ITO Nano-Powder by the Method of Ammonia Complexation

2012 ◽  
Vol 549 ◽  
pp. 441-444
Author(s):  
Li Da Sun ◽  
Du Shu Huang ◽  
Wei Liu ◽  
Yan Jiang ◽  
Rui Min Xiao ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Nucleation And Growth ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Nano Powder ◽  
Transmission Electron ◽  
Tin Oxides ◽  
Size And Morphology ◽  
Nucleation And Growth Mechanism

ITO (Indium Tin Oxides) nano-powder was prepared by the method of ammonia complexation. The chemical composition, morphology and crystal structure were characterized by X-ray diffraction (XRD) ,transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy analysis(XPS). Base on the nucleation and growth mechanism of the powder, the temperature of heat treatment impacting on size and morphology was discussed briefly. The results showed that the nano-ITO powder of particle size 20nm-40nm with well-pleasing particle shape and dispersion can be prepared at 800°C.

Microstructure and Reaction Mechanism during Fluorination of Isotropic Pitch

2012 ◽  
Vol 174-177 ◽  
pp. 44-49
Author(s):  
Jin Cai Zhang ◽  
Jing Li Shi ◽  
Xue Min Guo ◽  
Quan Gui Guo ◽  
Lang Liu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Fine Particles ◽  
Interlayer Spacing ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Surface Molecules ◽  
Isotropic Pitch ◽  
Scanning Electron Microscopic ◽  
Scanning Electron

Isotropic pitch fluorides were prepared via the reaction of isotropic pitch with gas mixture containing F2 and N2 in a rotation nickel reactor. Isotropic pitch fluorides were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and elemental analysis. The results showed that the interlayer spacing of the resultant materials dramatically increase from 0.345 nm of the isotropic pitch to the range 0.643 nm to 0.798 nm. Further studies on the diversity of the functional groups indicated that the whole reaction process was composed of two steps, namely, diffusion of F2 inside the voids among isotropic pitch molecules on the surface of the particles and fluorination. The two processes interacted with each other and jointly determined the apparent speed of the reaction. The scanning electron microscopic micrographs showed that the larger bulk of isotropic pitch was gradually desquamated and became small particles, which can be attributed to the crack resulting from the volume expansion of the surface molecules of the isotropic pitch fluorides during the reaction. The final isotropic pitch fluorides were fine particles with diameters of less than 1 µm.

pH Sensitive Polysulfone Membranes Prepared by Homogeneous Photo-Initiated Graft Copolymerization

2011 ◽  
Vol 396-398 ◽  
pp. 586-591
Author(s):  
He Lin Hua ◽  
Jun Chao Zhang ◽  
Na Li ◽  
Li An Wei
Keyword(s):  
Acrylic Acid ◽  
Photoelectron Spectroscopy ◽  
Graft Copolymerization ◽  
Ph Value ◽  
Irradiation Time ◽  
Attenuated Total Reflection ◽  
Inversion Method ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Phase Inversion Method

The copolymers of polysulfone-graft-acrylic (PSF-g-PAAc) acid were synthesized by homogeneous photo-initiated graft copolymerization method. Variable affecting the degree of grafting (DG), such as the ultraviolet irradiation time, and the concentrations of the acrylic acid monomer and photoinitiator, were investigated. The graft copolymers were characterized by chemical titration, attenuated total reflection-Fourier transform infrared spectroscopy and x-ray photoelectron spectroscopy analysis. It is verified that acrylic acid groups were present on the polysulfone polymer. Then, membranes were prepared from the PSF-g-PAAc powder with different DG using phase inversion method. It is found that the flux properties of the membranes were dependent on the pH value of the aqueous solution.

scholarly journals Study of the characteristics and properties of the SiO2/TiO2/Nb2O5 material obtained by the sol–gel process

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bruna Teixeira da Fonseca ◽  
Eliane D’Elia ◽  
José Márcio Siqueira Júnior ◽  
Sanair Massafra de Oliveira ◽  
Kelly Leite dos Santos Castro ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Acid Sites ◽  
Silica Matrix ◽  
High Dispersion ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Sol Gel Process ◽  
Synthesized Materials

AbstractThe SiO2/TiO2/Nb2O5 material was set by the sol–gel method and was characterized by several techniques through thermogravimetric, spectroscopic, and textural analyzes. For the two synthesized materials, the specific surface area was 350.0 and 494.0 m2 g−1 (SiTiNb-A and SiTiNb-B, respectively). An enhance of the crystalline order with the temperature increase of the thermal treatment was observed. Through X-ray Photoelectron Spectroscopy analysis, the binding energy values for the Ti 2p and Nb 3d levels showed the insertion of Ti and Nb atoms in the silica matrix. The Electron Dispersive Spectroscopy analyses also confirmed the high dispersion of the metals presented on the materials surface. The Thermogravimetric Analysis showed weight loss for the of 37.6% (SiTiNb-A) and 29.7% (SiTiNb-B). The presence of the crystalline phases TiO2-anatase and monoclinic-Nb2O5 in the materials was confirmed through the data obtained by association of powder X-ray Diffraction and FT-Raman. Values obtained from optical band-gap aimed the dependence of the oxides concentration and the calcination temperature. Finally, the pyridine adsorption studies have indicated the presence of Lewis and Brønsted acid sites.

scholarly journals MoS2-Carbon Inter-overlapped Structures as Effective Electrocatalysts for the Hydrogen Evolution Reaction

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1389
Author(s):  
Po-Chia Huang ◽  
Chia-Ling Wu ◽  
Sanjaya Brahma ◽  
Muhammad Omar Shaikh ◽  
Jow-Lay Huang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Hydrogen Generation ◽  
Interlayer Spacing ◽  
Monolayer Mos2 ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

The ability to generate hydrogen in an economic and sustainable manner is critical to the realization of a future hydrogen economy. Electrocatalytic water splitting into molecular hydrogen using the hydrogen evolution reaction (HER) provides a viable option for hydrogen generation. Consequently, advanced non-precious metal based electrocatalysts that promote HER and reduce the overpotential are being widely researched. Here, we report on the development of MoS2-carbon inter-overlapped structures and their applicability for enhancing electrocatalytic HER. These structures were synthesized by a facile hot-injection method using ammonium tetrathiomolybdate ((NH4)2MoS4) as the precursor and oleylamine (OLA) as the solvent, followed by a carbonization step. During the synthesis protocol, OLA not only plays the role of a reacting solvent but also acts as an intercalating agent which enlarges the interlayer spacing of MoS2 to form OLA-protected monolayer MoS2. After the carbonization step, the crystallinity improves substantially, and OLA can be completely converted into carbon, thus forming an inter-overlapped superstructure, as characterized in detail using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). A Tafel slope of 118 mV/dec is obtained for the monolayer MoS2-carbon superstructure, which shows a significant improvement, as compared to the 202 mV/dec observed for OLA-protected monolayer MoS2. The enhanced HER performance is attributed to the improved conductivity along the c-axis due to the presence of carbon and the abundance of active sites due to the interlayer expansion of the monolayer MoS2 by OLA.

Biological Synthesis of Triangular Pd Nanoplates by Aqueous Extract of Syzygium samarangense Leaf

2014 ◽  
Vol 522-524 ◽  
pp. 370-373
Author(s):  
Dao Hua Sun ◽  
Peng Yao Li ◽  
Xue Liang Li
Keyword(s):  
Electron Microscopy ◽  
Aqueous Extract ◽  
Photoelectron Spectroscopy ◽  
Biological Synthesis ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
Facile Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
Morphology And Structure

We report the facile synthesis of triangular Pd nanoplates using aqueous extract of Syzygium Samarangense leaf. The morphology and structure of the obtained Pd nanoplates were characterized by transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy analysis. FTIR spectra indicated that C=C, COH, and OCOH were mainly responsible for the formation of the Pd nanoplates.

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