scholarly journals Surface Modification of Nano-Hydroxyapatite by Coating Stearic Acid

2020 ◽  
Vol 1 (1) ◽  
pp. 1-4
Keyword(s):  
Surface Modification ◽  
Stearic Acid ◽  
Polymeric Matrix ◽  
Gravimetric Analysis ◽  
Polymeric Nanocomposites ◽  
Ceramic Particles ◽  
X Ray ◽  
Hydrophobic Polymers ◽  
Modification Method ◽  
Ceramic Reinforcement

Todays, researchers are challenging with manufacturing polymeric nanocomposites reinforced with ceramic particles due to two inherent properties of ceramic reinforcement particles, particle agglomeration and incompatibility between hydrophilic ceramic particles and hydrophobic polymeric matrix. So in this study, we used nano-Hydroxyapatite (n-HA) as ceramic material and Stearic acid as amphiphilic material for coating n-HA, hydroxysteric acid (SA) surfactant was used for surface coating particles between the hydrophilic HA powders and the hydrophobic polymers. The surface modification and effect of this method were evaluated by by Fourier transformation infrared (FTIR), x-ray diffractometer (XRD), thermal gravimetric analysis (TGA) and Scanning electron microscopy (SEM). The result of FTIR showed that n-HA surfaces were modified successfully and the modification method had the proper grafting amount according to TGA due to this method of modification will be proper for coating reinforcement particles in polymeric matrix.

scholarly journals Irradiation of a Nanocomposite of Pseudoboehmite-Nylon 6,12

2010 ◽  
Vol 71 ◽  
pp. 28-33 ◽  
Author(s):  
Antônio Hortêncio Munhoz Jr. ◽  
Renato Meneghetti Peres ◽  
L.H. Silveira ◽  
Leonardo Gondim Andrade e Silva ◽  
L.F. de Miranda
Keyword(s):  
Sol Gel ◽  
Thermo Gravimetric Analysis ◽  
Mechanical Tests ◽  
Polymeric Matrix ◽  
Nano Particles ◽  
Gravimetric Analysis ◽  
Polymeric Nanocomposites ◽  
X Ray Diffraction ◽  
Inorganic Substances ◽  
Sol Gel Process

Nanocomposites are nanometrical material particles embedded in a specific matrix. The degree of organization of the nanostructures and their properties depend on the nature of the organic and inorganic components of the structure that can generate synergic interactions. Polymeric nanocomposites are related to a class of hybrid materials where inorganic substances of nanometric dimensions are dispersed in a polymeric matrix. In the present work, nanocomposites of nylon 6,12 with different concentrations of pseudoboehmite obtained by sol-gel process were prepared with and without the presence of octadecylamine. After preparation, the samples were irradiated with a 200 kGy radiation dose in an electron accelerator. The pseudoboehmite nano particles were characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis and thermo gravimetric analysis. The nanocomposites were characterized by thermal and mechanical tests. The addition of pseudoboehmite promoted a reduction of the melting flow during the production of the composites evidencing the interaction of pseudoboehmite with the polymeric matrix, probably modifying its crystalline structure.

Preparation of Microencapsulated Phase Change Materials Using Surface Modification Method

2014 ◽  
Vol 902 ◽  
pp. 52-57
Author(s):  
Jin Hua Zhu ◽  
Qing Zhen Wen ◽  
Chao Yu ◽  
Xiong Wei ◽  
Li Qing Zhou
Keyword(s):  
Particle Size ◽  
Surface Modification ◽  
Phase Change ◽  
Phase Change Materials ◽  
Core Material ◽  
Particle Analysis ◽  
Gravimetric Analysis ◽  
Microencapsulated Phase Change Materials ◽  
Modification Method ◽  
Core Materials

With the adoption of surface modification method, microencapsulated phase change materials (MEPCM) with polyurea as wall materials, paraffin as core materials were successfully prepared. This paper made a research on the effect dosage of modifier might have on the content of microcapsule core materials. Findings indicated that the content of microcapsule core materials was relatively high as the dosage of modifier being core material 10 wt%. It was preliminarily proved that polyurea had been coated on the surface of paraffin particles by adopting Fourier Transform Infrared Spectrum (FTIR) to formulate the composition and structure of microcapsules. And the laser particle analysis declared that particle size distribution of microcapsules was narrow with average particle size of 389 μm. Thermo Gravimetric Analysis (TG) and Differential Scanning Calorimetry (DSC) were also employed to make a representation of the thermal properties of microcapsules, and it was shown that microcapsules were of wonderful phase change performance and thermal stability.

Impact of co-mixing technique and surface modification of ZnO nanoparticles using stearic acid on their dispersion into HDPE to produce HDPE/ZnO nanocomposites

2019 ◽  
Vol 27 (7) ◽  
pp. 389-399 ◽  
Author(s):  
FZ Benabid ◽  
N Kharchi ◽  
F Zouai ◽  
Abdel-Hamid I Mourad ◽  
D Benachour
Keyword(s):  
Surface Modification ◽  
Stearic Acid ◽  
Zno Nanoparticles ◽  
Food Packaging ◽  
Processing Technique ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Force ◽  
Uniform Dispersion

In this article, the effectiveness of the co-mixing processing technique and surface modification of zinc oxide (ZnO) filler on the characteristics of the developed high-density polyethylene (HDPE)/ZnO was investigated. ZnO was treated and co-mixed with stearic acid (SA) at a ratio of 50/50 wt% using kitchen coffee grinder and the mixture was then added to the HDPE matrix in a Brabender plastograph with various ZnO contents of 0.5, 1 and 2 wt%. The morphology of the nanocomposites was characterized using scanning electron microscopy (SEM). The micrographs showed well and uniform dispersion of both treated and untreated ZnO nanofiller; however, the treated ZnO particles showed better dispersion. The nanocomposite containing 1 wt% ZnO nanoparticles was found to have the optimal properties. The results of the SEM were supported by the atomic force microscopic technique. The uniform dispersion of ZnO was further investigated through X-ray diffraction spectra. The minor peaks of ZnO in the HDPE/treated and untreated ZnO nanocomposites are considered as an evidence for the presence of uniform and well-dispersed ZnO. The electrical conductivity of the nanocomposite samples is higher than that of neat HDPE due to the semiconducting nature of ZnO and increases with ZnO content. The results of this work proved that dispersibility can be achieved through the addition of SA and conductivity of the nanocomposite depends on the ZnO content. Moreover, co-mixing technique and the surface modification of the nanofillers are very effective in producing the HDPE/ZnO nanocomposites that have many potential industrial applications such as food packaging, drug and pharmaceutical bottles.

scholarly journals The Effect of 3-(Glycidoloxy Propyl) Trimethoxy Silane Concentration on Surface modification of SiO2 nanoparticles

2021 ◽  
Author(s):  
Hamed Bahramnia ◽  
Hamidreza Mohammadian Semnani ◽  
Ali Habibolahzadeh ◽  
Hassan Abdoos
Keyword(s):  
Surface Modification ◽  
Crystallite Size ◽  
Coupling Agent ◽  
Thermo Gravimetric Analysis ◽  
Sio2 Nanoparticles ◽  
Hydroxyl Group ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Trimethoxy Silane

Abstract AbstractCoupling agent concentration plays a key role in functionalization of SiO2 nanoparticles as reinforcing particles.PurposeIn this study, the influence of 3-(glycidoloxy propyl) trimethoxy silane (GPTMS) concentration on functionalization of SiO2 nanoparticles, is experimentally investigated.MethodsThe functionalization of nano-silica were performed by 30, 50, 80 and 110 wt.% of GPTMS in order to find the optimal GPTMS concentration to complete the process. Fourier Transformation Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Thermo Gravimetric Analysis (TGA) and X-Ray Diffraction (XRD) characterized the pure and modified samples; then, the results were compared to each other to achieve the aim of the research.ResultsFTIR results confirmed the silanization proceed due to the silane absorption peak disappearing and shifting of the hydroxyl group bonds in to the amide bonds. This test showed that 30 wt.% GPTMS has not been sufficient for full functionalization of the NPs. According to FESEM images, it seems that the NPs were better modified by 80 wt.% GPTMS due to the least NPs aggregation and lack of coupling agent deposition on the NPs. Also, TGA illustrates that this sample has higher thermal stability because of lower weight loss (11.2%) in coupling agent decomposition temperature range: 130-380°C. Furthermore, X-Ray Diffraction confirmed the FESEM and TGA results about the mentioned sample due to its highest crystallite size (increase 26.64% in crystallite size in comparison with the pure sample).ConclusionSo, the 80 wt.% of GPTMS introduced as the optimal concentration for surface modification of SiO2 nanoparticles.

scholarly journals Ceramic Waste-Based Natural Rubber Composites: An Exciting Way for Improving Mechanical Properties

2018 ◽  
Vol 4 (3) ◽  
pp. 576-582
Author(s):  
Y.G. Kondarage ◽  
H.M.J.C. Pitawala ◽  
T. Kirushanthi ◽  
D. Edirisinghe ◽  
Thusitha N. Etampawala
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Solid Wastes ◽  
Average Particle ◽  
Gravimetric Analysis ◽  
Ceramic Filler ◽  
Ceramic Particles ◽  
X Ray ◽  
Ceramic Waste ◽  
Micrometer Size

Large amounts of fired ceramic waste produced in ceramic industry do not have a proper method to reuse and mainly thrown away into landfills since fired ceramics have already been sintered and thus their utilization as a raw material is limited. However, these solid wastes have a major environmental and economic concern. Thus, a proper management of such solid wastes is eminent. This research is dedicated to evaluating the possibility of using such ceramic waste as a low-cost filler material in the manufacture of natural rubber based composites. Ceramic particles smaller than 125 μm were selected initially for the preparation natural rubber based composites. For the latter part of the study, particles in sub-micrometer length scales were used. Elemental analyses and composition of the phases of the ceramic particles were determined by X-ray fluorescence and diffraction respectively. The average particle size was characterized by scanning electron microscope (SEM). The surfaces of the sub micrometer size ceramic particles were modified using Silane69 coupling agent. The surface modification was confirmed by Fourier-transform infrared spectroscopy, thermo gravimetric analysis and SEM coupled with energy-dispersive X-ray spectroscopy. Natural rubber based composites were prepared with different levels of ceramic filler loadings. The mechanical properties of the composites such as hardness, resilience, compression set, abrasion volume loss and tensile properties were evaluated. These properties of the composites were compared with those of the composites prepared according to the same formulation except the ceramic filler (control). The composites were found to have an exciting enhancement of mechanical properties with respect to the control. The mechanical property improvement is higher when the ball milled sub-micrometer size ceramic filler is used and it is even better when surface modified ceramic particles are used.

Study on Surface Modification of Mica Pearl Pigment with Stearic Acid

2016 ◽  
Vol 852 ◽  
pp. 774-781
Author(s):  
Qian Yu ◽  
Yong Le Ke ◽  
Xu Kun Tan ◽  
Gao Dan Luo ◽  
Sheng Bo Han ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Surface Modification ◽  
Stearic Acid ◽  
X Ray ◽  
Electrostatic Spraying ◽  
Ft Ir ◽  
Powder Spraying ◽  
Scanning Electron ◽  
Effect Of Surface ◽  
Ft Ir Spectroscopy

Using stearic acid as modifier, the surface of mica pearl pigment organic modification technology are discussed in this paper, and the application effect of after modified. X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and Scanning electron microscope (SEM) were used to characterize the effect of surface modification. Electrostatic spraying test (EST) and Chromatism test were used to characterize the application effect of after modified. The results showed that the stearic acid could be successfully grafted on the surface of mica pearl pigment and enhanced hydrophobicity. Besides, it was demonstrated that the mica pearl pigment treated with stearic acid could make the value of chromatism deviation are low, which also could significantly improve the powder spraying ratio at low spray voltages.

scholarly journals A Superhydrophobic, Antibacterial, and Durable Surface of Poplar Wood

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1885
Author(s):  
Xinyu Wu ◽  
Feng Yang ◽  
Jian Gan ◽  
Zhangqian Kong ◽  
Yan Wu
Keyword(s):  
Stearic Acid ◽  
Antibacterial Properties ◽  
Alkali Resistance ◽  
Poplar Wood ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Acid And Alkali Resistance ◽  
The Stability

The silver particles were grown in situ on the surface of wood by the silver mirror method and modified with stearic acid to acquire a surface with superhydrophobic and antibacterial properties. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray energy spectroscopy (XPS) were used to analyze the reaction mechanism of the modification process. Scanning electron microscopy (SEM) and contact angle tests were used to characterize the wettability and surface morphology. A coating with a micro rough structure was successfully constructed by the modification of stearic acid, which imparted superhydrophobicity and antibacterial activity to poplar wood. The stability tests were performed to discuss the stability of its hydrophobic performance. The results showed that it has good mechanical properties, acid and alkali resistance, and UV stability. The durability tests demonstrated that the coating has the function of water resistance and fouling resistance and can maintain the stability of its hydrophobic properties under different temperatures of heat treatment.

scholarly journals Rapid four-component synthesis of dihydropyrano[2,3-c]pyrazoles using nano-eggshell/Ti(IV) as a highly compatible natural based catalyst

BMC Chemistry ◽  
2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Arefeh Dehghani Tafti ◽  
Bi Bi Fatemeh Mirjalili ◽  
Abdolhamid Bamoniri ◽  
Naeimeh Salehi
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Reaction Times ◽  
Diffraction Field ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solvent Free Conditions ◽  
High Yields ◽  
Work Up

AbstractNano-eggshell/Ti(IV) as a novel naturally based catalyst was prepared, characterized and applied for the synthesis of dihydropyrano[2,3-c]pyrazole derivatives. The characterization of nano-eggshell/Ti(IV) was performed using Fourier Transform Infrared spectroscopy, X-ray Diffraction, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and Thermo Gravimetric Analysis. Dihydropyrano[2,3-c]pyrazoles were synthesized in the presence of nano-eggshell/Ti(IV) via a four component reaction of aldehydes, ethyl acetoacetate, malononitrile and hydrazine hydrate at room temperature under solvent free conditions. The principal affairs of this procedure are mild condition, short reaction times, easy work-up, high yields, reusability of the catalyst and the absence of toxic organic solvents.

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