scholarly journals Acoustic Properties of a New Composite Material Obtained from Feather Flour and Recycled Polypropylene

2022 ◽  
Vol 58 (4) ◽  
pp. 84-93
Author(s):  
Mirela Alina Constantin ◽  
Lucian Alexandru Constantin ◽  
Sebastian Aradoaei ◽  
Mihaela Aradoaei ◽  
Mihai Bratu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Natural Fibers ◽  
Adsorption Properties ◽  
Point Of View ◽  
Acoustic Properties ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Recycled Polypropylene ◽  
Sustainable Materials ◽  
Scanning Electron

Sustainable materials made from recycled materials are an alternative to traditional materials (synthetic ones) and present a lower environmental impact. Due to the fact that natural fibers were successfully used to produce environmentally friendly sound adsorbing materials, biocomposites made from recycled polypropylene (PPR), feathers flour (FF) with / without compatibilizers (C) were obtained and characterized from the point of view of their acoustical behavior. Obtained materials were characterized also from the morphological and compositional point of view by scanning electron microscopy and thermal gravimetric analysis. All tested samples presented sound adsorption properties but the best results were obtained for the biocomposites with FF content of 10%-20%.

The Utilization of Recycled Newspaper in the Production of Cellulose Microfiber

2016 ◽  
Vol 1133 ◽  
pp. 644-648 ◽  
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 ◽  
Scanning Electron

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.

scholarly journals Effects of surfactants on the properties of epoxy/graphene nanocomposites

2018 ◽  
Vol 37 (14) ◽  
pp. 960-967 ◽  
Author(s):  
Jiacheng Wei ◽  
Mohd Shahneel Saharudin ◽  
Thuc Vo ◽  
Fawad Inam
Keyword(s):  
Electron Microscopy ◽  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Gum Arabic ◽  
Mechanical Analysis ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Graphene Nanocomposites ◽  
The Matrix ◽  
Scanning Electron

Recently, graphene has attracted extensive research interests due to its superior mechanical, electrical and thermal performance. Small loadings of graphene can increase the properties of epoxy significantly. However, because of the large surface area of graphene, it is a challenge to disperse graphene in liquid epoxy. Strong van der Waals force causes reaggregation of graphene in the matrix. As commonly used surfactants, sodium dodecyl sulphate and gum arabic have been used a lot to de-bundle graphene, however, their dispersing efficiencies for graphene in epoxy matrix is unknown. Therefore, to evaluate their dispersing efficiencies, epoxy/graphene nanocomposites had been made and mechanical properties, dynamic mechanical analysis, thermal gravimetric analysis and scanning electron microscopy tests of nanocomposites had been conducted. The results show that the properties of nanocomposites had been enhanced largely after using sodium dodecyl sulphate and gum arabic. Sodium dodecyl sulphate shows higher dispersing effectiveness than gum arabic.

Synthesis and Properties of Poly(3,4-Ethylenedioxythiophene) via Solid-State Polymerization

2011 ◽  
Vol 306-307 ◽  
pp. 261-264
Author(s):  
Shu Ai Chen ◽  
Jing Kun Xu ◽  
Dan Hua Zhu ◽  
Xue Min Duan
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Solid State ◽  
Main Chain ◽  
Conductivity Measurement ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Electrical Conductivity Measurement ◽  
Solid State Polymerization ◽  
Scanning Electron

Conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) has been synthesized by solid-state polymerization of 2,5-diiodo-3,4-ethylenedioxythiophene under normal conditions. The resulting iodine-doped PEDOT is completely insoluble in common organic solvents and retained partial crystal structure of monomer as indicated by scanning electron microscopy. Electrical conductivity measurement showed that PEDOT exhibited conductivity in the range of 0.16–0.23 S/cm (pressed powder pellet) with temperature dependence. Thermogravimetric and differential thermal gravimetric analysis of PEDOT indicated that its main chain was stable up to ca. 200 °C.

scholarly journals Avaliação do bagaço de cana natural e modificado como potencial sorvente de óleo vegetal

2016 ◽  
Vol 11 (4) ◽  
pp. 129
Author(s):  
Viviane Vasques da Silva Guilarduci ◽  
Honória Fátima Gorgulho ◽  
Patrícia Benedini Martelli ◽  
Vanessa Soares dos Santos ◽  
William Graciliano Corrêa
Keyword(s):  
Electron Microscopy ◽  
Acetic Anhydride ◽  
Vegetable Oil ◽  
Sugarcane Bagasse ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oily Water ◽  
Scanning Electron

O óleo e a gordura vegetal residual, utilizados para a preparação de alimentos representam um perigoso poluente para as águas de córregos e rios. Um dos métodos mais utilizados nas últimas décadas para limpeza da água oleosa é a aplicação de biossorventes, pois apresentam facilidade para remoção e recuperação do óleo. Neste sentido, o objetivo deste trabalho foi determinar a influência das modificações do bagaço de cana com anidrido acético (acetilação) e com 3-aminopropiltrietoxisilano (silanização) sob a sorção de óleo vegetal. A modificação das fibras foi avaliada pelas técnicas de espectroscopia no infravermelho com transformada de Fourier (FTIR), análise termogravimétrica (TG), difração de raios X, microscopia eletrônica de varredura (MEV) e análise de área superficial e porosidade. Os resultados obtidos indicaram maior sorção de óleo vegetal para o bagaço de cana modificado com anidrido acético (BCA), 667 mg.g-1, seguido pelo bagaço de cana sem modificação (BCN) com sorção de 576 mg.g-1. O bagaço de cana modificado com 3-aminopropiltrietoxisilano (BCS) apresentou menor sorção, 425 mg.g-1, o que foi atribuído à sua maior hidrofilicidade.Evaluation of natural and modified sugarcane bagasse as sorbent of vegetable oil Abstract: The oil and the residual vegetable fat, used for the preparation of foods represent a dangerous pollutant for the waters of streams and rivers. One of the most used methods in the last decades for cleaning the oily water is the application of biosorbents, since they are easy to remove and recover the oil. In this sense, the purpose of this work was to determine the influence of the modifications of sugarcane bagasse with acetic anhydride (acetylation) and with 3-aminopropyltriethoxysilane (silanization) under sorption of vegetable oil. The BCN and the grafted products were further characterized by FTIR spectroscopy, thermal gravimetric analysis, X-ray diffraction, scanning electron microscopy and analysis of surface area and porosity. The results showed higher sorption of vegetable oil for the acetic anhydride-modified sugarcane bagasse (BCA), 667 mg.g-1, followed by sugarcane bagasse without modification (BCN) with sorption of 576 mg.g-1. The cane bagasse modified with 3-aminopropyltriethoxysilane (BCS) presented lower sorption, 425 mg.g-1, which was attributed to its greater hydrophilicity.  

SB12 Assisted Synthesis of Nano CuO via Precipitation Method in Different Reaction Environments

2015 ◽  
Vol 749 ◽  
pp. 164-168
Author(s):  
Gamze Bozkurt ◽  
Ayşe Bayrakçeken Yurtcan ◽  
Abdulkadir Özer
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Precipitation Method ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Procedure ◽  
Scanning Electron

In this study, CuO was synthesized via precipitation method by using Cu (CH3COO)2.H2O as precursor. KOH+NH3, KOH and NaOH were used as reactants and zwitterionic 3-(N,N-dimethyldodecylammonio) propane-sulfonate (SB12) as surfactant in the synthesis procedure. The samples were calcined at 500°C. All prepared CuO structures were characterized by X-ray diffraction (XRD), thermal gravimetric analysis (TGA), Fourier Transform Infrared (FTIR) spectra, and scanning electron microscopy (SEM) techniques. Electrochemical characterization was performed by cyclic voltammetry (CV). CuO showed different nanostructures according to the characterization results. Furthermore, electrochemical properties of the resulting structures were investigated. The specific capacitances of the CuO structures in different environments were determined by using CV technique in the order of: KOH+NH3>KOH>NaOH.

Facile Biomimetic Fabrication of Hollow Hydroxyapatite with Hierarchically Porous Microstructure Using Hyperbranched Gemini Surfactant as Template

2014 ◽  
Vol 1015 ◽  
pp. 355-358 ◽  
Author(s):  
Shan Li ◽  
Hua Hong Wu ◽  
Guo Jie Xu ◽  
Xiu Feng Xiao
Keyword(s):  
Electron Microscopy ◽  
Mass Fraction ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray ◽  
Porous Microstructure ◽  
Ft Ir ◽  
Scanning Electron

We successfully developed a facile synthetic way to 3D hollow HAp microspheres. We used Ca (NO3)2and (NH4)3PO4as materials, hyperbranched Gemini surfactant (PCD) as template.We used some techniques to characterize the products,such as X-ray powder diffraction (XRD), Fourier transform infrared spectroscope (FT-IR), Scanning electron microscopy (SEM) and Thermal gravimetric analysis (TG).The effects of the Gemini surfactant concentration on the morphology and crystal degree of the samples were analyzed.We proposed a possible growth of mechanism.The product morphology could vary from rod to hollow sphere by adjusting the template concentration.When the template concentration was low,ball-like hydroxyapatite preliminary formed.With increasing the template concentration,the crystal degree of products declined. While the spherical cluster composed of numbers of flake or needle architectures were appeared. The results show that when the mass fraction of template is 0.01%,we can product uniform well-defined hollow spherical hydroxyapatite with semidiameter about 1.5μm.

scholarly journals Sintesis Micro-Fibrillated Cellulose dari Serat Tandan Kosong Sawit dengan Hidrolisis Asam Oksalat

2020 ◽  
Vol 10 (01) ◽  
pp. 1
Author(s):  
Rizka Karima ◽  
Evana Yuanita ◽  
Bunda Amalia ◽  
Agustina Arianita ◽  
Tiara Mailisa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxalic Acid ◽  
Microfibrillated Cellulose ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
X Ray ◽  
Empty Fruit Bunches ◽  
Hydrolysis Process ◽  
Scanning Electron

Tandan Kosong Sawit (TKS) merupakan limbah padat dari industri pengolahan kelapa sawit yang melimpah di Indonesia dan mengandung banyak selulosa. Microfibrillated cellulose (MFC) dapat diproduksi dari serat TKS. Tujuan dari penelitian ini adalah untuk mensintesis MFC dari serat TKS melalui proses alkalisasi,  pemutihan dan hidrolisis. TKS dicacah dan dihaluskan hingga berukuran 60 mesh untuk proses pembuatan pulp TKS. Proses alkalisasi dilakukan dalam reaktor menggunakan 4% NaOH pada suhu 90˚C selama 2 jam dan dilanjutkan dengan proses pemutihan mengunakan 20% H2O2 pada suhu kamar selama 2 jam. Kemudian proses hidrolisis dilakukan menggunakan asam oksalat 5% pada suhu 80°C selama 1 jam. MFC yang dihasilkan dianalisis menggunakan Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Difraction (XRD), Thermal Gravimetric Analysis (TGA) dan Field Emission Scanning Electron Microscopy (FESEM). Hasil analisis FTIR menunjukkan bahwa adanya penurunan kadar lignoselulosa yang dikonfirmasi juga oleh hasil uji kuantitatif kadar lignin. Hasil uji XRD menunjukkan peningkatan nilai kristalinitas. Hasil uji TGA menunjukkan hidrolisis menggunakan asam oksalat 5% dapat meningkatkan area degradasi termal dan hasil FESEM menunjukkan telah terjadi proses fibrilisasi serat dan penurunan diameter ukuran serat dari 400 µm menjadi 10 µm. Dari hasil penelitian ini, jika dilihat dari hasil kristalinitas, sifat termal dan ukuran diameter serat, proses hidrolisis menggunakan asam oksalat 5% adalah proses yang baik untuk pembuatan MFC dari serat TKS. Synthesis of Micro-Fibrillated Cellulose (MFC) from Oil Palm Empty Fruit Bunches (OPEFB) Fiber with Oxalic Acid HydrolysisAbstractOil Palm Empty Fruit Bunches (OPEFB), which is a solid waste from the palm oil processing industry, has a high availability in Indonesia, and it contains a lot of cellulose. Microfibrillated cellulose (MFC) can be produced from OPEFB fiber. This work’s objective was to synthesize MFC from fibers of OPEFB through the process of alkalization, bleaching process, and the hydrolysis process using an oxalic acid solution. The procedure began chopped fiber until 60 mesh, and alkalization process of pulping OPEFB in the reactor using 4% NaOH at the temperature of 90 ˚C for 2 hours. It continued with the addition of 20% H2O2 at room temperature for 2 hours. The hydrolysis process is carried out using an oxalic acid 5 % at temperature of 80°C for 1 hour. MFC was analyzed using Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Thermal Gravimetric Analysis (TGA), and Field Emission Scanning Electron Microscopy (FESEM). The FTIR analysis showed that the quantitative result also confirmed a decrease in lignocellulose content. XRD result showed an increase in the value of crystallinity. TGA results showed that hydrolysis using oxalic acid can increase the area of thermal degradation, and FESEM results showed there is a decreasing diameter of fiber from 400 µm to 10 µm. From the results of this study, when viewed from the results of crystallinity, thermal properties, and size of the fiber diameter, the hydrolysis process using 5% oxalic acid is a good process for making MFCs from TKS fibers.

Preparation and Characteristics of Electrospun Silver-Containing PHBV Ultrafine Fiber

2014 ◽  
Vol 548-549 ◽  
pp. 34-37 ◽  
Author(s):  
Ming Hua Min ◽  
Yu Yuan Shi ◽  
Xiao Xue Chen ◽  
Jian Gao Shi ◽  
Hai You Ma ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Average Diameter ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Scanning Calorimetry ◽  
Ultrafine Fibers ◽  
Ultrafine Fiber ◽  
Thermal Stability Of ◽  
Scanning Electron

The effects of synthesized silver nanoparticles on electrospun PHBV ultrafine fibers were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). Addition of silver nanoparticles increased from 0.1% to 2.0%, the sooth ultrafine fiber with an average diameter of about 2 μm formed a non-woven mat was obtained. DSC showed the efficient heterogeneous nucleation by the silver nanoparticles for facilitating PHBV crystallization.The thermal stability of the PHBV/Ag ultrafine fibers improved with the increase in the content of the silver nanoparticles.

Oxidation Behavior of Steel and Pure Copper at 500-700°C

2013 ◽  
Vol 421 ◽  
pp. 401-405
Author(s):  
Sang An Ha ◽  
Jei Pil Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Oxidation Behavior ◽  
Pure Copper ◽  
Thermal Gravimetric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Composition And Structure ◽  
Gravimetric Apparatus ◽  
Scanning Electron

The oxidation behavior of steel and pure copper has been investigated in the temperature range of 500-700°C at various oxygen pressures. The rate of oxidation was measured using thermal gravimetric apparatus (TGA). The morphology, composition and structure of the oxide scale were determined by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

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