Utilization of copper sulphide nanoparticles for the development of cashew tree gum/ chitin biopolymer blend nanocomposites

2021 ◽  
pp. 089270572110462
Author(s):  
MT Ramesan ◽  
M Subburaj ◽  
G Mathew ◽  
BK Bahuleyan
Keyword(s):  
Electron Microscope ◽  
Uv Spectroscopy ◽  
Impedance Analysis ◽  
Uv Spectra ◽  
Sem Analysis ◽  
Copper Sulphide ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Cashew Tree ◽  
Blend Nanocomposites

This work focused on the preparation of biopolymer blend nanocomposites from chitin (CT) and cashew tree gum (CTG) with different contents of copper sulphide nanoparticles (CuS) by solution casting method. The formation of nanocomposites have been characterized by FT infrared (FTIR), UV spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), thermogravimetry (TGA), differential scanning calorimetry (DSC) and impedance analysis. The characteristic absorption of nanoparticles in the FTIR spectra and shift in UV spectra of blend composites revealed the strong interaction between CuS nanoparticles and the polar segments of CT/CTG blend. With the increase in dosage of nanoparticles, a decrease in amorphous domains has been noted in the XRD scans. The uniform distribution of nanoparticles in CT/CTG network has been confirmed by the SEM analysis. HRTEM of the blend composites reveals the formation of hemispherical nanoparticles with a diameter of 15–30 nm. The glass transition temperature of blend composites increased with the addition of nano-CuS in the polymer matrix. Compared to the pure CT/CTG blend, the prepared nanocomposite showed higher thermal stability. Mechanical properties such as tensile strength and hardness of the blend nanocomposites were greatly enhanced by the reinforcement of CuS into the CT/CTG matrix. The AC conductivity and dielectric properties of the nanocomposites increased with the concentration of fillers and the magnitude of these properties was higher than the pure polymer blend.

Preparation of a monodisperse poly (N-phenylmaleimide–acrylonitrile–styrene) structural nanolatex for heat-resistant modification of PVC

2018 ◽  
Vol 32 (3) ◽  
pp. 409-423
Author(s):  
Jin Wang ◽  
Hua Qiu ◽  
Bo Cheng ◽  
Fan Zhang ◽  
Shuhua Qi
Keyword(s):  
Electron Microscope ◽  
Elemental Analysis ◽  
Hybrid Composite ◽  
Average Diameter ◽  
Microemulsion Polymerization ◽  
Scanning Calorimetry ◽  
Thermogravimetric Analyzer ◽  
Melt Compounding ◽  
Transmission Electron ◽  
Ftir Spectrometer

A monodisperse poly ( N-phenylmaleimide–acrylonitrile–styrene) (PNAS) nanolatex was synthesized via seed microemulsion polymerization. The obtained PNAS nanolatex was then directly used as an organic nanofiller to prepare polyvinyl chloride (PVC)/PNAS hybrid composite through water blending and melt compounding. The characteristics of PNAS nanolatex were analyzed by Fourier transform infrared (FTIR) spectrometer, elemental analysis, scanning electron microscope, transmission electron microscope (TEM), dynamic laser lighting scattering (DLS), differential scanning calorimetry (DSC), and thermogravimetric analyzer (TGA). FTIR and elemental analysis confirmed the formation of PNAS copolymer with high monomers conversion; meanwhile, for the PNAS nanoparticles, the morphology of a well-defined core–shell spherical structure with average diameter ranging from 156 nm to 249 nm was observed. DSC analysis and TGA indicated that both polymers had excellent compatibility, and the corresponding heat resistance of PVC was greatly improved with the addition of PNAS. When PNAS loading was 50 wt%, the glass transition temperature value of PVC/PNAS hybrid composite was increased by 22.4°C, compared with that of pristine PVC. The mechanical properties of the PVC composite were also enhanced with the addition of PNAS.

scholarly journals Comparison of the Growth and Thermal Properties of Nonwoven Polymers after Atomic Layer Deposition and Vapor Phase Infiltration

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1028
Author(s):  
Laura Keskiväli ◽  
Pirjo Heikkilä ◽  
Eija Kenttä ◽  
Tommi Virtanen ◽  
Hille Rautkoski ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Electron Microscope ◽  
Atomic Layer Deposition ◽  
Atomic Layer ◽  
Scanning Transmission Electron Microscope ◽  
Scanning Calorimetry ◽  
Polymeric Surfaces ◽  
Transmission Electron ◽  
Layer Deposition ◽  
Scanning Transmission

The growth mechanism of Atomic Layer Deposition (ALD) on polymeric surfaces differs from growth on inorganic solid substrates, such as silicon wafer or glass. In this paper, we report the growth experiments of Al2O3 and ZnO on nonwoven poly-L-lactic acid (PLLA), polyethersulphone (PES) and cellulose acetate (CA) fibres. Material growth in both ALD and infiltration mode was studied. The structures were examined with a scanning electron microscope (SEM), scanning transmission electron microscope (STEM), attenuated total reflectance-fourier-transform infrared spectroscopy (ATR-FTIR) and 27Al nuclear magnetic resonance (NMR). Furthermore, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis were used to explore the effect of ALD deposition on the thermal properties of the CA polymer. According to the SEM, STEM and ATR-FTIR analysis, the growth of Al2O3 was more uniform than ZnO on each of the polymers studied. In addition, according to ATR-FTIR spectroscopy, the infiltration resulted in interactions between the polymers and the ALD precursors. Thermal analysis (TGA/DSC) revealed a slower depolymerization process and better thermal resistance upon heating both in ALD-coated and infiltrated fibres, more pronounced on the latter type of structures, as seen from smaller endothermic peaks on TA.

scholarly journals Electrospun Multiple-Chamber Nanostructure and Its Potential Self-Healing Applications

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2413 ◽  
Author(s):  
Yubo Liu ◽  
Xinkuan Liu ◽  
Ping Liu ◽  
Xiaohong Chen ◽  
Deng-Guang Yu
Keyword(s):  
Electron Microscope ◽  
Electrochemical Corrosion ◽  
Average Diameter ◽  
Self Healing ◽  
Scanning Calorimetry ◽  
Uniform Size ◽  
Transmission Electron ◽  
Reactive Fluids ◽  
Amine Curing ◽  
First Time

To address the life span of materials in the process of daily use, new types of structural nanofibers, fabricated by multifluid electrospinning to encapsulate both epoxy resin and amine curing agent, were embedded into an epoxy matrix to provide it with self-healing ability. The nanofibers, which have a polyacrylonitrile sheath holding two separate cores, had an average diameter of 300 ± 140 nm with a uniform size distribution. The prepared fibers had a linear morphology with a clear three-chamber inner structure, as verified by scanning electron microscope and transmission electron microscope images. The two core sections were composed of epoxy and amine curing agents, respectively, as demonstrated under the synergistic characterization of Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), and differential scanning calorimetry. The TGA results disclosed that the core-shell nanofibers contained 9.06% triethylenetetramine and 20.71% cured epoxy. In the electrochemical corrosion experiment, self-healing coatings exhibited an effective anti-corrosion effect, unlike the composite without nanofibers. This complex nanostructure was proven to be an effective nanoreactor, which is useful to encapsulate reactive fluids. This engineering process by multiple-fluid electrospinning is the first time to prove that this special multiple-chamber structure has great potential in the field of self-healing.

Thermal transport, thermomechanical, and dielectric properties of chalcogenide Se98–xAg2Inx (x = 0, 2, 4, 6) system

2014 ◽  
Vol 92 (7/8) ◽  
pp. 648-653
Author(s):  
C. Dohare ◽  
N. Mehta
Keyword(s):  
Dielectric Constant ◽  
Electron Microscope ◽  
Dielectric Loss ◽  
Thermal Transport ◽  
Microstructural Analysis ◽  
Thermomechanical Properties ◽  
X Ray Diffraction ◽  
Glassy System ◽  
Scanning Calorimetry ◽  
Transmission Electron

The present work reports a detailed study of some physical properties of some novel glasses of Se98–xAg2Inx (x = 0, 2, 4, 6) system. Measurements of thermal transport properties (i.e., thermal conductivity, κ, and thermal diffusivity, χe) have been carried out using the transient plane source technique. Specific heat measurements have been done by differential scanning calorimetry. Thermomechanical properties (i.e., Vickers hardness, Hv, and modulus of elasticity, E) have been evaluated by the indenter test. The minimal energy for formation of microvoids, Eh, and microvoids volume, Vh, of the previously mentioned glassy system are discussed in terms of microhardness, Hv. Temperature and frequency dependence of dielectric constant, ε1, and dielectric loss, ε2, for the same system were measured in the frequency (50 Hz – 1000 kHz) and temperature (303–338 K) range. The experimental results illustrate that the values of dielectric constant, ε1, and dielectric loss, ε2, are decreased with frequency and increased with temperature. The maximum barrier height, Wb, is calculated using the dielectric measurements according to the Guintini equation. The morphology and microstructural analysis of as-prepared alloys are confirmed by X-ray diffraction, scanning electron microscope, and transmission electron microscope.

scholarly journals Removal of benzotriazole by Photo-Fenton like process using nano zero-valent iron: response surface methodology with a Box-Behnken design

2017 ◽  
Vol 19 (1) ◽  
pp. 104-112 ◽  
Author(s):  
Mehdi Ahmadi ◽  
Kurosh Rahmani ◽  
Ayat Rahmani ◽  
Hasan Rahmani
Keyword(s):  
Response Surface Methodology ◽  
Electron Microscope ◽  
Response Surface ◽  
Sem Analysis ◽  
Zero Valent Iron ◽  
X Ray Diffraction ◽  
Box Behnken Design ◽  
Transmission Electron ◽  
Nano Zero Valent Iron ◽  
Good Agreement

Abstract In this paper, the removal of benzotriazole (BTA) was investigated by a Photo-Fenton process using nano zero valent iron (NZVI) and optimization by response surface methodology based on Box-Behnken method. Effect of operating parameters affecting removal efficiency such as H2O2, NZVI, and BTA concentrations as well as pH was studied. All the experiments were performed in the presence of ultraviolet radiation. Predicted levels and BTA removal were found to be in good agreement with the experimental levels (R2 = 0. 9500). The optimal parameters were determined at 60 min reaction time, 15 mg L-1 BTA, 0.10 g L-1 NZVI, and 1.5 mmol L-1 H2O2 for Photo-Fenton-like reaction. NZVI was characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) images, and scanning electron microscope (SEM) analysis.

Study on Thermal Conductivity of Multilayer Graphene/NR Composite

2014 ◽  
Vol 933 ◽  
pp. 3-7 ◽  
Author(s):  
Gui Long Wu ◽  
Long Liu ◽  
Xiao Zong ◽  
Yan He ◽  
Ze Peng Wang
Keyword(s):  
Thermal Conductivity ◽  
Differential Scanning Calorimetry ◽  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Mass Fraction ◽  
Structure Change ◽  
Multilayer Graphene ◽  
Scanning Calorimetry ◽  
Structure And Morphology ◽  
Transmission Electron

Graphene/NR composite was prepared in emulsion blending and the multilayer graphene was about 4-8 layers. Different mass fraction of this kind of graphene was mixed into NR in this work.The thermal conductivity of this compositive system was respected to be improved apparently since the high thermal conductivity of graphene. In this work, TEM(Transmission electron microscope) was used to observe the structure and morphology of the multilayer graphene. NETZSCH LFA was used to research the change of thermal conductivity with the fraction of grahene changing. DSC(differential scanning calorimetry) was used to research the structure change in the series of composites. The TEM results showed that the graphene we used is 4-5 layers. LFA had proved that the multilayer graphene has affected the thermal conductivity of matrix greatly and DSC also provided evidence to support the same views.

TEM Sample Preparation Using A Focused Ion Beam and A Probe Manipulator

1996 ◽  
Author(s):  
L.R. Herlinger ◽  
S. Chevacharoenkul ◽  
D.C. Erwin
Keyword(s):  
Electron Microscope ◽  
Integrated Circuits ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Specific Area ◽  
Sem Analysis ◽  
Imaging Analysis ◽  
Mechanical Grinding ◽  
Transmission Electron ◽  
Multiple Samples

Abstract Cross-sectioning is a necessary technique for the failure analysis of integrated circuits. Historically, the majority of samples have been prepared for scanning electron microscope (SEM) analysis. Today's smaller geometry devices, however, increasingly require the improved spatial resolution afforded by the transmission electron microscope (TEM), both in imaging analysis and in elemental analysis. Specific-area cross-section TEM (SAXTEM) analysis allows the failure analyst to identify defects that may go undiscovered in the SEM. A procedure is described for a timely preparation of SAXTEM samples using a focused ion beam (FIB) instrument and a manipulator probe. This procedure extends the state-of-the-art in several key respects: A) no mechanical grinding is necessary, B) samples as large as the FIB chamber can be accommodated, e.g., whole wafers, C) multiple samples can be prepared from one die, D) the procedure is faster and more repeatable than previously reported procedures.

Preparation and characteristics of sepiolite-waterborne polyurethane composites

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tong Xu ◽  
Hong Xu ◽  
Yi Zhong ◽  
Linping Zhang ◽  
Di Qian ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Waterborne Polyurethane ◽  
Elemental Content ◽  
Layer By Layer ◽  
Silane Coupling Agents ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
Organically Modified ◽  
Polyurethane Composites

Abstract A kind of organic/inorganic composite material composed of waterborne polyurethane and sepiolite was prepared in this work. Sepiolite was organically modified by three kinds of silane coupling agents, and then compounded with waterborne polyurethane through layer-by-layer method in order to prepare composite materials. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) show the crystal and chemistry structure of sepiolite samples, and confirmed the preparation of organic sepiolite. Scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) showed the surface microstructure and elemental content of sepiolite and organic sepiolite, and was consistent with the XRD results. Transmission electron microscope (TEM) examination of waterborne polyurethane composites surfaces showed that sepiolite particles were regularly dispersed in the waterborne polyurethane matrix. Thermal resistance of waterborne polyurethane composites was determined by thermogravimetry analyzer (TG) and derivative thermogravimetry analyzer (DTG), differential scanning calorimetry (DSC), gas chromatography (GC), and mass chromatography (MS). Mechanical behavior was examined by tensile strength tester, showed higher break strength than that of the control waterborne polyurethane. Therefore, organically modified sepiolite was considered to be a kind of wonderful inorganic material that could be used to improve the thermal stability and mechanical property of polymer.

scholarly journals Synthesis of BaTiO3 Nanoparticles via Hydrothermal Method

2017 ◽  
Vol 268 ◽  
pp. 172-176 ◽  
Author(s):  
Nurul Norfarina Hasbullah ◽  
Oon Jew Lee ◽  
Josephine Liew Ying Chyi ◽  
Soo Kien Chen ◽  
Zainal Abidin Talib
Keyword(s):  
Electron Microscope ◽  
Hydrothermal Method ◽  
Transmission Electron Microscope ◽  
Hydrothermal Process ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
Average Size ◽  
Tga And Dsc

In this work, BaTiO3 nanoparticles were synthesized through hydrothermal method. The powder obtained from the hydrothermal process (as-synthesized powder) was calcined at 1000 °C. The phase formation and morphology of the as-synthesized and calcined powders were studied using X-ray diffraction (XRD), thermogravimetric (TGA) and differential scanning calorimetry (DSC) analyzer, and transmission electron microscope (TEM). The XRD data showed that the as-synthesized powder is partially amorphous. Upon calcining the powder at 1000 °C, highly crystalline BaTiO3 with tetragonal structure was obtained. As shown by TGA and DSC analysis, the precursor powder was completely transformed into BaTiO3 at 1000 °C. The presence of BaCO3 as an impurity phase in the powder is due to the lack of Ba2+ / Ti3+/4+. Transmission electron microscope images showed that the particle size of the as-synthesized powder increased after calcination due to crystal growth. In addition, nanocubes with the average size of around 11.66 nm were obtained as a result of the calcination compared to the ellipsoid like particles of the as-synthesized powder.

scholarly journals Production and characterization of Al-Cu and Al-Ni nanoparticles

2015 ◽  
Vol 1758 ◽  
Author(s):  
Alexander Vorozhtsov ◽  
Marat Lerner ◽  
Nikolay Radkevich ◽  
Sergey Bondarchuk ◽  
Dongsheng Wen
Keyword(s):  
Electron Microscope ◽  
Binary Systems ◽  
Bimetallic Nanoparticles ◽  
Exothermic Reaction ◽  
Electrochemical Process ◽  
Reaction Products ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Wire Method

ABSTRACTThe present work deals with the production and characterization of metal and bimetallic nanopowders.The electric explosion wire method for production of metal nanopowders is presented. The method enables to produce both metal and bimetallic nanoparticles (BMNP) with controlled content of metals within one particle. An alternative method to obtain bimetallic nanoparticles is also suggested using a spontaneous electrochemical process from salt solutions. BMNP for both Al-Cu and Al-Ni have been prepared and studied.The oxidation, ignition and thermal reactivity of the BMNP of Al-Cu and Al-Ni in a simultaneous thermogravimetric (TG) and differential scanning calorimetry (DSC) experiments have been carried out. The microstructure has been characterized with a scanning electron microscope (SEM) and transmission electron microscope (TEM). The phase compositions of the reaction products have been investigated with X-ray diffraction.By comparing the peak temperature of the first exothermic reaction in DSC and the phase transition temperatures in the respective binary systems, it has been found that for Al-Cu BMNP the melting of an alloy played a pivotal role for the early ignition reaction. The comparison of the reactivity of BMNP with that of aluminum nanoparticles has shown a greater reactivity of BMNP Al-Cu and Al-Ni.

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