Metal-Based Iodine Bearing Materials Prepared by Mechanical Milling

2015 ◽  
Vol 1758 ◽  
Author(s):  
Song Wang ◽  
Amy Corcoran ◽  
Victoria Leybova ◽  
Edward L. Dreizin
Keyword(s):  
Mechanical Milling ◽  
Thermo Gravimetric Analysis ◽  
Combustion Products ◽  
Biological Weapons ◽  
Gravimetric Analysis ◽  
Composite Powders ◽  
Two Stage ◽  
Thermo Gravimetric ◽  
Constant Rate ◽  
Bearing Materials

ABSTRACTRecent research has demonstrated that ternary aluminum-boron-iodine (Al-B-I2) materials prepared by mechanical milling are effective in generating biocidal combustion products. Such reactive materials are of interest for the munitions aimed to defeat stockpiles of biological weapons. In this research, ternary Mg∙B∙I2 composites were synthesized using two-stage milling. The first stage consisted of a binary B∙I2 powder prepared by mechanical milling, followed by addition of magnesium for iodine stabilization. Specific compositions for each ternary material were varied. Stability of the samples was assessed by their heating in argon at a constant rate using Thermo Gravimetric Analysis (TGA) and observing weight loss. Oxidation of the prepared powders was also studied by TGA. Ternary Mg∙B∙I2 composite powders prepared by two-stage milling were more stable than any of the previously prepared iodine-bearing materials with the same concentration of iodine (20 wt %). Particle size distributions were measured using low-angle laser light scattering. Powders were ignited using in an air-acetylene flame and in a constant volume explosion apparatus. Particle burn times and temperatures were measured optically. Substantially longer burn times and lower temperatures were observed for the prepared materials compared to the reference pure Mg powder.

Dynamic mechanical and thermogravimetric analysis of PTFE blended tailor-made textile woven basalt–vinyl ester composites

2016 ◽  
Vol 47 (6) ◽  
pp. 1226-1240 ◽  
Author(s):  
Karthikeyan Subramanian ◽  
Rajini Nagarajan ◽  
Subramaniam Saravanasankar ◽  
Jacob Sukumaran ◽  
Patrick De Baets
Keyword(s):  
Vinyl Ester ◽  
Loss Modulus ◽  
Thermo Gravimetric Analysis ◽  
Wear Test ◽  
Mechanical Analysis ◽  
Woven Fabric ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Bearing Materials ◽  
Dynamic Coefficient Of Friction

In this work, the authors prepared basalt–vinyl ester tailor-made green composites with uncoated and polytetrafluroethylene coated basalt woven fabric. These composites were subjected to dynamic composites-made mechanical analysis and thermo gravimetric analysis. Results revealed that a significant improvement of 18%, 14% and 13% was observed for storage and loss modulus and damping properties of polytetrafluroethylene-coated composite at low temperature region. The thermo gravimetric analysis results indicated a three-stage degradation for the polytetrafluroethylene-filled composites. Based on the acceptability from the literature, the tribo-test was performed only on the polytetrafluroethylene-coated composite for the selected PV limit of 400 MPa-mm/s (10 KN and 50 mm/s) in a flat-on-flat configuration. It was found that the influence of polytetrafluroethylene filler on the static and dynamic coefficient of friction and specific wear rate of the composite was more pronounced at dry wear test condition and it was found as 0.22, 0.12, and 4.87484 E-09, respectively. However, the results of improved storage and loss modulus and damping manifested negative correlation with the friction characteristics in the glassy region. Further, the SEM-coupled EDX spectral analysis was performed to understand the formation of transfer layer in counter surface. This polytetrafluroethylene blended composite is to be considered as an alternative to the bearing materials in offshore application.

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

scholarly journals Development of Nervilia fordii Extract-Loaded Electrospun PVA/PVP Nanocomposite for Antioxidant Packaging

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1728
Author(s):  
Peng Wen ◽  
Teng-Gen Hu ◽  
Yan Wen ◽  
Ke-Er Li ◽  
Wei-Peng Qiu ◽  
...  
Keyword(s):  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Poly Vinyl Alcohol ◽  
Total Phenolic ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Phenolic And Flavonoid ◽  
Thermal Stability Of

An ethyl acetate extract from of Nervilia fordii (NFE) with considerable suppression activity on lipid peroxidation (LPO) was first obtained with total phenolic and flavonoid contents and anti-LPO activity (IC50) of 86.67 ± 2.5 mg GAE/g sample, 334.56 ± 4.7 mg RE/g extract and 0.307 mg/mL, respectively. In order to improve its stability and expand its application in antioxidant packaging, the nano-encapsulation of NFE within poly(vinyl alcohol) (PVA) and polyvinyl(pyrrolidone) (PVP) bio-composite film was then successfully developed using electrospinning. SEM analysis revealed that the NFE-loaded fibers exhibited similar morphology to the neat PVA/PVP fibers with a bead-free and smooth morphology. The encapsulation efficiency of NFE was higher than 90% and the encapsulated NFE still retained its antioxidant capacity. Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD) analysis confirmed the successful encapsulation of NFE into fibers and their compatibility, and the thermal stability of which was also improved due to the intermolecular interaction demonstrated by thermo gravimetric analysis (TGA). The ability to preserve the fish oil’s oxidation and extend its shelf-life was also demonstrated, suggesting the obtained PVA/PVP/NFE fiber mat has the potential as a promising antioxidant food packaging material.

The Experimental Study on Combustion Characteristics of Corn Straw and Coal Gangue

2011 ◽  
Vol 135-136 ◽  
pp. 1057-1059
Author(s):  
Heng Tao Zhou ◽  
Yong Wei
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Combustion Characteristics ◽  
Combustion Characteristic ◽  
Gravimetric Analysis ◽  
Characteristic Parameters ◽  
Corn Straw ◽  
Kinetics Analysis ◽  
Thermo Gravimetric ◽  
Ignition Characteristic ◽  
Coal Residue

With a thermo gravimetric analysis apparatus combustion characteristics experiments of coal residue cornstalk and mixtures of them were done at 20 C/min heating rate. Then the combustion characteristic Parameters were obtained by above experiments. The c combustion activation energies were acquired by kinetics analysis. The results show those: the ignition characteristic and synthesis combustion characteristic of coal residue are bad. The ignition characteristic and synthesis combustion characteristic of cornstalk are better. The combustion characteristics of the mixture of coal residue and cornstalk are determined by mixing ratio. The ratio of cornstalk is more and the synthesis combustion characteristic is better.

Grafting of Chitosan: Structural, Thermal and Antimicrobial Properties

2019 ◽  
Vol 41 (2) ◽  
pp. 240-240
Author(s):  
Nevin Cankaya Nevin Cankaya
Keyword(s):  
Antimicrobial Activity ◽  
Graft Copolymers ◽  
Thermo Gravimetric Analysis ◽  
Antimicrobial Properties ◽  
Gravimetric Analysis ◽  
Analysis Method ◽  
Methacryloyl Chloride ◽  
Thermo Gravimetric ◽  
Thermal Stabilities ◽  
Ft Ir

In this study, some new chitosan materials were synthesized by the grafting of chitosan with the monomers such as 1-vinylimidazole (VIM), methacrylamide (MAm) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). First of all, chitosan methacrylate was prepared by esterification of primary -OH group with methacryloyl chloride a 25.13% yield by mole. The monomers were grafted into chitosan methacrylate via free radical polymerization using 2,2and#39;-Azobisisobutyronitrile as an initiator in N,N-dimethylformamide. The graft copolymers were characterized by FT-IR spectra and elemental analysis. Thermal stabilities of the graft copolymers were determined by TGA (thermo gravimetric analysis) method. The synthesized chitosan methacrylate and its graft copolymers were tested for their antimicrobial activity against bacteria and yeast.

Functionalization of α-ZrP by 1,2-Epoxypropane for Further Modification

2017 ◽  
Vol 898 ◽  
pp. 2347-2353
Author(s):  
Ahmed Hossamaldin ◽  
Ping Liu ◽  
Ya Du ◽  
Xiao Ze Jiang ◽  
Bin Sun ◽  
...  
Keyword(s):  
Epoxy Group ◽  
Thermo Gravimetric Analysis ◽  
Mas Nmr ◽  
Interlayer Distance ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Grafting Ratio ◽  
Internal Surfaces ◽  
Carbon Mass ◽  
Ft Ir

To prepare alpha zirconium phosphate (α-ZrP) with high interlayer distance, grafting ratio and thermal stability, 1,2-epoxypropane was used to modify α-ZrP as the epoxy group reacting with P-OH on the external and internal surfaces of α-ZrP to form P-O-C bonds after small amines pre-intercalation. Different characterization techniques were used, including X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Thermo-Gravimetric Analysis (TGA) and Carbon Mass Nuclear Magnetic Resonance (13C MAS NMR). The results of XRD confirmed the pre-intercalation of amino-propane and the intercalation of 1,2-epoxypropane, as the interlayer distance increased from 7.5 Å to 16.9 Å and 15.3 Å, respectively. FT-IR and 13C MAS NMR results confirmed the formation of P-O-C bonds between 1,2-epoxypropane and α-ZrP. TGA analysis showed that the grafting ratio of 1,2-epoxypropane was 19.44%.

Sign in / Sign up

Export Citation Format

Share Document