Carboxyl graphene reinforced melamine-based polyamide nanocomposites

Over the years, various types of techniques have been used for the synthesis of nanocomposites. In this work, melamine-based polyamide (PA) was synthesized using a one-pot polycondensation method under mild conditions. carboxyl graphene (CG)/PA nanocomposites (CGMPA) were prepared by CG nanofiller loadings of 1, 3, and 5 wt.% via delamination/adsorption approach. The prepared CGMPA nanocomposites were characterized using different analyses, such as Fourier transform infrared techniques (FTIR), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), differential scanning calorimetric (DSC), and thermogravimetric analysis (TGA). The effects of the CG on the thermal properties of the CGMPA nanocomposites were significant. The results showed that the melting temperature (Tm) of neat PA and CGMPA were increased from 378°C to 393°C suggested better dispersion of CG in PA matrix. The decomposition temperature of PA was increased from 451°C to 463°C in CGMPA nanocomposites indicates the better thermal stability of PA matrix by addition of CG.

Structural and thermoelectric properties of the Pr2Zr2O7 compound

ECORFAN Journal-Democratic Republic of Congo ◽

10.35429/ejdrc.2019.9.5.4.9 ◽

2019 ◽

pp. 4-9

Author(s):

Adolfo Quiroz-Rodríguez ◽

Cesia Guarneros-Aguilar ◽

Ricardo Agustin-Serrano

Keyword(s):

Electron Microscopy ◽

Thermal Conductivity ◽

Thermoelectric Properties ◽

Crystal Size ◽

Ambient Pressure ◽

X Ray Diffraction ◽

X Ray ◽

Increasing Temperature ◽

Thermal Stability Of ◽

In this research, it is presented a detailed study of the structural and thermoelectric properties of the pyrochlore zirconium Pr2Zr2O7 compound prepared by solid-state reaction (SSR) in air at ambient pressure. The synthesized sample was characterized using powder X-ray diffraction. The thermal stability of the thermoelectric compound (TE) Pr2Zr2O7 was tested by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Scanning electron microscopy shows that the crystal size varies between 0.69 and 2.81μm. Electrical conductivity (\sigma) of the sample calcined at 1400 °C presented values increase irregularly with the increasing temperature from 0.001 to 0.018 S cm-1 as expected in a semiconductor material. The thermal conductivity is lower than 0.44 - 775 W m-1 K-1 which is quite anomalous in comparison with the thermal conductivity of other oxides.

Surface Modification of 1-Butyl-3-Methylimidazolium Chloride -Treated Lignocellulosic Materials

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1010.526 ◽

2020 ◽

Vol 1010 ◽

pp. 526-531

Author(s):

Asanah Radhi ◽

Abdullah Othman ◽

Muhammad Afif Aziz ◽

Nik Raihan Nik Yusoff

Keyword(s):

Electron Microscopy ◽

Surface Modification ◽

Functional Group ◽

Hydroxyl Groups ◽

Lignocellulosic Materials ◽

X Ray Diffraction ◽

X Ray ◽

Hexadecyl Trimethylammonium Bromide ◽

Thermal Stability Of ◽

Lignocellulosic materials are generally considered hydrophilic due to the high density of hydroxyl groups. The use of lignocellulosic materials in hydrophobic systems thus require surface modification. Therefore, in this study, cellulose (MCC) and sawdust (SD) have been pretreated with ionic liquid, 1-butyl-3-methylimidazolium chloride (BMIMCl) prior to surface modification with cationic surfactant, hexadecyl trimethylammonium bromide (CTAB). The effect of BMIMCl pretreatment prior to surface modification has been investigated. Crystallinity, functional group changes, morphology and thermal stability of the sawdust and cellulose upon BMIMCl pretreatment and surface modification have been studied using x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and thermogravimetric Analysis (TGA). XRD results showed that the structure of lignocellulosic materials became more amorphous upon pretreatment with BMIMCl. FTIR results indicated that the modification of lignocellulosic is more efficient in BMIMCl-pretreated samples. Percentage of decomposition is higher for the BMIMCl-pretreated and CTAB modified samples.

The Utilization of Recycled Newspaper in the Production of Cellulose Microfiber

10.4028/www.scientific.net/amr.1133.644 ◽

2016 ◽

Vol 1133 ◽

pp. 644-648 ◽

Cited By ~ 1

Author(s):

Mohamad Azuwa Mohamed ◽

Wan Norharyati Wan Salleh ◽

Juhana Jaafar ◽

Ahmad Fauzi Ismail

Keyword(s):

Electron Microscopy ◽

Cost Effective ◽

Gravimetric Analysis ◽

Thermal Gravimetric ◽

X Ray Diffraction ◽

X Ray ◽

Reinforcement Material ◽

Cellulose Microfibers ◽

Thermal Stability Of ◽

Cellulose microfibers (CMF) were produced by utilizing recycled newspaper paper (RNP) as starting material. This approach is considered as green since recycling newspaper leads to the environment preservation and also cost-effective. The effect on the structural properties of cellulose produced at different stage of pretreatment were investigated by using Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Thermal gravimetric analysis (TGA). The FTIR and SEM demonstrate that the hemicellulose and lignin was successfully removed from the structure of the CMF. XRD and TGA results revealed that the different step of pretreatment was increased the crystallinity and thermal stability of CMF increased gradually. The improvement in CMF crystallinity has improved its thermal properties which is important in the field of reinforcement material.

Structure and Thermal Stability of Sugarcane Bagasse Cellulose Regenerated from Dialkylphosphate Ionic Liquids

10.4028/www.scientific.net/amr.800.106 ◽

2013 ◽

Vol 800 ◽

pp. 106-110 ◽

Cited By ~ 2

Author(s):

Meng Wang ◽

Li Hong Cui ◽

Ji Hua Li ◽

Xiao Yi Wei ◽

Fei Wang ◽

...

Keyword(s):

Electron Microscopy ◽

Thermal Stability ◽

Sugarcane Bagasse ◽

Structural Modification ◽

Regenerated Cellulose ◽

X Ray Diffraction ◽

X Ray ◽

Downstream Processes ◽

Thermal Stability Of ◽

A phosphate-based ionic liquid, 1-ethyl-3-methylimidazolium diethylphosphate ([EMI[DE), was synthesized and used to dissolve sugarcane bagasse cellulose under microwave radiation. The original and regenerated cellulose were both characterized by X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The results showed that cellulose had a more porous and less crystalline structure after regeneration, whereas chemical composition had no change. Thermal stability of the regenerated cellulose was somewhat lower, corresponding to the decreased crystallinity. In short, the treatment with [EMI[DE led to desirable structural modification on sugarcane bagasse cellulose via physical process. This is of great benefit to the subsequent downstream processes, such as enzymatic hydrolysis and ethanol fermentation.

One-pot synthesis of 2-amino-4H-chromene derivatives by MNPs@Cu as an effective and reusable magnetic nanocatalyst

RSC Advances ◽

10.1039/c9ra01679a ◽

2019 ◽

Vol 9 (23) ◽

pp. 12801-12812 ◽

Cited By ~ 7

Author(s):

Wanzheng MA ◽

Abdol Ghaffar Ebadi ◽

Mostafa shahbazi sabil ◽

Ramin Javahershenas ◽

Giorgos Jimenez

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Vibrating Sample Magnetometry ◽

X Ray Diffraction ◽

Magnetic Nanocatalyst ◽

One Pot ◽

X Ray ◽

MNPs@Cu as an effective, recyclable nanocatalyst was prepared and characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis vibrating sample magnetometry, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction.

Formation and Stability of NI(PT) Silicide on (100)SI and (111)SI

MRS Proceedings ◽

10.1557/proc-564-163 ◽

1999 ◽

Vol 564 ◽

Cited By ~ 17

Author(s):

D. Mangelinck ◽

J. Y. Dai ◽

S. K. Lahiri ◽

C. S. Ho ◽

T. Osipowicz

Keyword(s):

Electron Microscopy ◽

Thermal Stability ◽

Scanning Electron Microscopy ◽

X Ray Diffraction ◽

Rutherford Back Scattering ◽

Kinetics And Thermodynamics ◽

X Ray ◽

Back Scattering ◽

Thermal Stability Of ◽

AbstractThe effect of a small amount of Pt (5 at.%) on the thermal stability of NiSi film on (100)Si and (111 )Si has been investigated. Rutherford back scattering, Scanning Electron Microscopy, and X-ray diffraction have been used to study the formation, microstructure and orientation of the silicide. The addition of platinum results in increasing the disilicide nucleation temperature to 900°C and thus leads to a better stability of NiSi at high IC processing temperatures. The presence of Pt also induced a texture of the NiSi film both on (11 1)Si and (100)Si. The increase in thermal stability is explained in terms of nucleation controlled reaction concept and should open new possibilities for the use of NiSi in self aligned silicidation. The redistribution of Pt in the silicide is examined and explained in terms of kinetics and thermodynamics considerations. The addition of Pt also increases the temperature of agglomeration of NiSi.

Benefeciation of Derived Bovine Bone Waste Hydroxyapatite Obtained from Meatballs Sellers and its Characterization

10.4028/www.scientific.net/amr.1123.155 ◽

2015 ◽

Vol 1123 ◽

pp. 155-159 ◽

Cited By ~ 1

Author(s):

Dwi Asmi

Keyword(s):

Electron Microscopy ◽

Bovine Bone ◽

Phase Content ◽

X Ray Diffraction ◽

Content Type ◽

X Ray ◽

Carbonate Ions ◽

Morphologic Characteristics ◽

Thermal Stability Of ◽

In this study, bovine bone waste obtained from meatballs sellers was utilized as novel alternative bioresource of hydroxyapatite (HA). The femur bovine bone waste in bulk form was initially deproteinized using HCl and NaOH and then followed by calcination at 500 °C and 800 °C for 5 h to obtained HA powder. The thermal stability of HA powder was monitored using simultaneous thermogravimetric analysis (TG) and differential thermal analysis (DTA). The TG/DTA result shows that the combustion of the organic component of bone, especially of collagen occured at temperature range of 174-550 °C. The phase content, type of bond present, and morphology of calcined HA powder were conducted using x-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM) respectively. The crystallinity of the HA sample shows increase with increasing of the temperature calcination. The characteristic of bands of HA and additionally peaks of carbonate ions were observed in the FTIR results and the morphologic characteristics of the HA particles shows the material is a homogeneous powder.

ZnO/Graphene Composites: Synthesis, Characterization and Optical Properties

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.609-610.76 ◽

2014 ◽

Vol 609-610 ◽

pp. 76-81 ◽

Cited By ~ 1

Author(s):

Ling Wei Hu ◽

Hua Tian ◽

Yu Xia Zhang ◽

Kun Lu ◽

Ai Hua Jing

Keyword(s):

Electron Microscopy ◽

Aqueous Solution ◽

Growth Process ◽

Gas Sensing ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

Transmission Electron ◽

Potential Applications ◽

ZnO/graphene composites has been synthesized using a one-pot hydrothermal method at moderate temperature of 90°C. Hydrothermal growth was done in an aqueous solution consisting of 20 mL graphene oxide (GO) solution (0.25 mg/mL) with equimolar of zinc acetate [ZAc, Zn (CH3COO)2·2H2 and hexamethylenetetramine (HMTA, C6H12N4). The as-synthesized composites was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The results of the characterization indicate that GO was reduced to graphene in the growth process, while ZnO in the form of quantum dots (QDs) or nanoparticles embedded in the graphene sheet. The composites synthesized by this method will have potential applications in bioimaging, gas sensing, optoelectrical materials and devices. The photoluminescence (PL) of the conposites was also investigated.

Investigation on the Thermal Stability of the Compounds Y1-xErxCo5 (x = 0, 0.12, 0.24)

10.4028/www.scientific.net/amr.815.126 ◽

2013 ◽

Vol 815 ◽

pp. 126-129

Author(s):

Wei He ◽

Yong Zhi Zhang ◽

Yun Hong Zhao ◽

Ling Min Zeng

Keyword(s):

Electron Microscopy ◽

Thermal Stability ◽

Thermal Analysis ◽

Decomposition Reaction ◽

Decomposition Temperature ◽

Energy Dispersive Analysis ◽

X Ray ◽

Cobalt Compounds ◽

Thermal Stability Of ◽

The rare earth-cobalt compounds with CaCu5-type structure were discovered to have outstanding permanent magnetic properties. The thermal stability of Y1-xErxCo5(x = 0, 0.12, 0.24) was investigated by X-ray powder diffraction, differential thermal analysis and scanning electron microscopy with energy dispersive analysis. The influence of Er for Y on the decomposition of Y1-xErxCo5was discussed. The substitution of Er for Y in the compound YCo5obviously enhanced the decomposition temperature and accelerated the decomposition reaction of the compounds Y1-xErxCo5into (Y1-xErx)2Co17and (Y1-xErx)2Co7.

ONE-POT SYNTHESIS OF INTERESTING 3D γ-MnOOH NETWORKS

NANO ◽

10.1142/s1793292014500842 ◽

2014 ◽

Vol 09 (07) ◽

pp. 1450084 ◽

Cited By ~ 2

Author(s):

HAIQIU LIU ◽

YUJIAN JIN ◽

NA LI ◽

LILI WANG ◽

SUNQI LOU ◽

...

Keyword(s):

Electron Microscopy ◽

Solvothermal Method ◽

Three Dimensional ◽

Oriented Attachment ◽

X Ray Diffraction ◽

One Pot ◽

X Ray ◽

Transmission Electron ◽

3D Networks ◽

Three-dimensional (3D) γ- MnOOH networks are successfully prepared by one-pot solvothermal method without using any catalyst. The samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). It is found that the amounts of urea and H 2 O 2 added, reaction temperature and time have important influences on the samples. It is interesting that the 3D networks are formed from the oriented attachment (OA) of Mn 3 O 4 octahedrons; and that the phase transformation from Mn 3 O 4 to γ- MnOOH occurs via the protonation of Mn 3 O 4. This study is expected to offer a facile approach to the syntheses of new, intricate nanostructures.