Surface Modification of Polymers by Ozone. In Situ FT-IR Analysis of Thermal Ozonolysis Process for Polystyrene Derivatives

2009 ◽  
pp. 149-164
Keyword(s):  
Surface Modification ◽  
Ft Ir ◽  
Ir Analysis

scholarly journals Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 774
Author(s):  
Eleonora Sočo ◽  
Dorota Papciak ◽  
Magdalena M. Michel ◽  
Dariusz Pająk ◽  
Andżelika Domoń ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Synthesis Conditions ◽  
High Calcium ◽  
Ft Ir ◽  
Ir Analysis ◽  
Wet Synthesis

(1) Hydroxyapatite (Hap), which can be obtained by several methods, is known to be a good adsorbent. Coal fly ash (CFA) is a commonly reused byproduct also used in environmental applications as an adsorbent. We sought to answer the following question: Can CFA be included in the method of Hap wet synthesis to produce a composite capable of adsorbing both heavy metals and dyes? (2) High calcium lignite CFA from the thermal power plant in Bełchatów (Poland) was used as the base to prepare CFA–Hap composites. Four types designated CFA–Hap1–4 were synthesized via the wet method of in situ precipitation. The synthesis conditions differed in terms of the calcium reactants used, pH, and temperature. We also investigated the equilibrium adsorption of Cu(II) and rhodamine B (RB) on CFA–Hap1–4. The data were fitted using the Langmuir, Freundlich, and Redlich–Peterson models and validated using R2 and χ2/DoF. Surface changes in CFA–Hap2 following Cu(II) and RB adsorption were assessed using SEM, SE, and FT-IR analysis. (3) The obtained composites contained hydroxyapatite (Ca/P 1.67) and aluminosilicates. The mode of Cu(II) and RB adsorption could be explained by the Redlich–Peterson model. The CFA–Hap2 obtained using CFA, Ca(NO3)2, and (NH4)2HPO4 at RT and pH 11 exhibited the highest maximal adsorption capacity: 73.6 mg Cu/g and 87.0 mg RB/g. (4) The clear advantage of chemisorption over physisorption was indicated by the Cu(II)–CFA–Hap system. The RB molecules present in the form of uncharged lactone were favorably adsorbed even on strongly deprotonated CFA–Hap surfaces.

In Situ FT-IR Analysis of a Composite Curing Reaction Using a Mid-Infrared Transmitting Optical Fiber

1988 ◽  
Vol 42 (6) ◽  
pp. 972-979 ◽  
Author(s):  
David A. C. Compton ◽  
Stephen L. Hill ◽  
Norman A. Wright ◽  
Mark A. Druy ◽  
Joseph Piche ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Hazardous Materials ◽  
Graphite Fiber ◽  
Matrix Resin ◽  
Mid Infrared ◽  
Ir Spectrometry ◽  
Ft Ir ◽  
Ir Analysis ◽  
Polyimide Matrix

The use of a mid-infrared transmitting fiber to carry the infrared beam of an FT-IR spectrometer outside of the optical bench is reported. In addition it is demonstrated that it is possible to analyze samples using the fiber as an internal reflection element. The fiber is covered with a protective coating which can be removed for a short region, to allow contact with the sample over a controlled length. Two examples of the use of an optical fiber for remote sampling are discussed. The first shows that a spectrum of a liquid sample (2-butanone) can be easily measured, and the second shows how a fiber can be used to monitor the progress of curing reactions in thermoset composite materials. The spectrum of a resin was recorded before the cure by embedding the optical fiber in the graphite fiber/polyimide matrix resin prepreg, and then the progress of the cure was monitored during the curing process. This type of remote sampling shows tremendous potential for opening totally new areas of usage for FT-IR spectrometry, including the studies of hazardous materials, enclosed reactions, and processes that do not allow samples to be taken inside the spectrometer.

A study of ultrasound/H2O2 combined surface modification on polyglycolic acid monofilaments for acupoint catgut embedding therapy application

2018 ◽  
Vol 89 (15) ◽  
pp. 3112-3126
Author(s):  
Shaoju Fu ◽  
Dongchao Yang ◽  
Cunyi Zhao ◽  
Peihua Zhang
Keyword(s):  
Surface Modification ◽  
Cell Attachment ◽  
Polyglycolic Acid ◽  
Contact Angles ◽  
Swelling Behavior ◽  
Polar Groups ◽  
Embedding Therapy ◽  
Ft Ir ◽  
Ir Analysis

Polyglycolic acid (PGA) monofilament has been regarded as an excellent acupoint catgut embedding therapy (ACET) material because it offers numerous advantages, including easy accessibility and good forming and degradable properties. However, the poor hydrophilicity and cytocompatibility are the main disadvantages preventing it from having wider applications. In this communication, two types of PGA monofilaments were first fabricated from their polymer chips, followed by ultrasound/H2O2 combined surface modification at 1:1 (V/V), and different ultrasound frequencies (45, 60 and 75 KHz) were explored. The modified PGA monofilaments were fully characterized with respect to structure characterizations (surface morphology, weights and diameters, Fourier transform infrared spectroscopy (FT-IR) analysis and hydrophilicity), mechanical properties (tensile property, swelling behavior and flexibility) and in vitro properties (cytotoxicity, cell attachment and cell morphology). The results showed that the PGA monofilaments after modification would become coarser, with larger weights and diameters. Samples 1-PGA 75 and 2-PGA 75 exhibited the smallest contact angles at 70.51° ± 3.27° and 62.84° ± 2.53°, respectively. The FT-IR analysis results confirmed that some polar groups emerged, promoting the hydrophilicity of PGA monofilaments. The swelling behavior of monofilaments was enhanced, while tensile and bending stiffness values slightly decreased. All the prepared samples presented no toxicity, and the cell attachment ratio (cultured for 48 h) of PGA monofilaments had been greatly improved after modification. These findings present important clinical implications in the ACET materials manufacturing process and warrant further study to develop new PGA embedding materials with outstanding clinical efficacy.

Effect of surface modification on the electrical properties of TiO2 and SnO2 nanopowders

1997 ◽  
Vol 501 ◽  
Author(s):  
Fabienne Chancel ◽  
Jérôme Tribout ◽  
Marie-Isabelle Baraton
Keyword(s):  
Surface Modification ◽  
Electrical Properties ◽  
Gas Sensors ◽  
Tin Dioxide ◽  
Free Carriers ◽  
Conductivity Variation ◽  
Ft Ir ◽  
Effect Of Surface ◽  
Ft Ir Spectroscopy

ABSTRACTThe surface modification of titania and tin dioxide nanopowders by hexamethyldisilazane and hexamethyldisiloxane grafting has been followed in situ by FT-IR spectroscopy. A grafting mechanism is proposed for both compounds and the formation of new surface species is discussed. Since TiO2 and SnO2 are widely used in chemical gas sensors due to their electrical properties, the respective behaviors of the non-grafted and grafted samples in reducing (CO) environment as well as the humidity effects are compared. Because the transmitted IR energy depends on the concentration of the free carriers, a correlation between the electrical conductivity variation and the perturbation of the IR spectra is attempted.

Photocatalytic degradation of hydrogen sulfide and in situ FT-IR analysis of reaction products on surface of TiO2

2005 ◽  
Vol 61 (1-2) ◽  
pp. 159-163 ◽  
Author(s):  
Sho Kataoka ◽  
Enkyu Lee ◽  
M. Isabel Tejedor-Tejedor ◽  
Marc A. Anderson
Keyword(s):  
Hydrogen Sulfide ◽  
Photocatalytic Degradation ◽  
Reaction Products ◽  
Ft Ir ◽  
Ir Analysis

MOCVD Processes for Electronic Materials Adopting Bi(C6H5)3 Precursor

2004 ◽  
Vol 811 ◽  
Author(s):  
C. Bedoya ◽  
G. G. Condorelli ◽  
G. Anastasi ◽  
J. Lisoni ◽  
D. Wouters ◽  
...  
Keyword(s):  
Main Product ◽  
Electronic Materials ◽  
Initial Step ◽  
Film Deposition ◽  
Decomposition Products ◽  
Depth Profiles ◽  
Ft Ir ◽  
Ir Analysis ◽  
Effect Of Oxygen

ABSTRACTMOCVD of Bi2O3 has been investigated using Bi(C6H5)3 precursor. The decomposition products obtained at various deposition temperatures were determined using in situ FT-IR analysis. Benzene was the main product formed in the heterogeneous decomposition of Bi(C6H5)3 at temperature lower than 450°C, while above 450°C typical products of the combustion of aromatic ring were observed. The effect of oxygen on the film composition and its role in the decomposition process was evaluated by XPS depth profiles. Moreover, preliminary studies on the initial step of the film deposition suggested that Bi2O3 nucleation rate depends upon precursor partial pressure.

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