Surface Modification of Magnesium Hydroxide by A-174 Silane

2014 ◽  
Vol 881-883 ◽  
pp. 1424-1430 ◽  
Author(s):  
Nian Yi Wang ◽  
Zhi Qi Liu ◽  
Li Juan Li ◽  
Li Xia Zhu
Keyword(s):  
Fourier Transform ◽  
Surface Modification ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Thermogravimetric Analysis ◽  
Magnesium Hydroxide ◽  
Silane Coupling Agent ◽  
Index Analysis ◽  
Silane Coupling ◽  
Scanning Electron

The surface of magnesium hydroxide (MH) was modified with a silane coupling agent A-174 (3-methacryloxypropyltrimethoxysilane) to improve MH dispersion and hydrophobicity. The effects of modification on the resultant product and the mechanisms involved were studied through activation index analysis, thermogravimetric analysis, Fourier transform infrared spectroscopy and scanning electron microscope. The optimum modification conditions were obtained as follows: an A-174 dosage of 1.5 wt.% at 145 °C for 10 min at a stirring rate of 3000 rpm. A chemical reaction was observed between the MH surfaces and A-174. The dispersion and hydrophobicity of MH remarkably improved after surface modification.

Surface Modification of Magnesium Hydroxide with Stearic Acid

2012 ◽  
Vol 602-604 ◽  
pp. 1693-1699 ◽  
Author(s):  
Dong Sheng Zhang ◽  
Zhi Qi Liu ◽  
Li Juan Li ◽  
Li Xia Zhu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Surface Modification ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Stearic Acid ◽  
Magnesium Hydroxide ◽  
Esterification Reaction ◽  
Scanning Calorimetry ◽  
Scanning Electron

The surface of magnesium hydroxide (MH) was modified with stearic acid (SA). The modification mechanism was analyzed using a scanning electron microscope, thermogravimetric analysis, differential scanning calorimetry, and Fourier transform infrared spectroscopy. The results showed that an esterification reaction occurred between SA and MH. The modification effect was evaluated by activation index and oil absorbance rate. The results indicated that the optimum technological conditions were as follows: SA dosage was 1.25 wt. % at 70 °C for 10 min at a stirring rate of 2000 rpm. As a result, both dispersion and hydrophobicity of modified MH were remarkably improved.

Preparation and Characterization of Attapulgite-KH550 Nanocomposites and their Application to Methane Absorption

2012 ◽  
Vol 528 ◽  
pp. 31-34 ◽  
Author(s):  
Fei Liu ◽  
Tao Hu ◽  
Shi Ying Ren ◽  
Ying Ying Shi
Keyword(s):  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Silane Coupling Agent ◽  
Absorption Capacity ◽  
Methane Absorption ◽  
Structure And Morphology ◽  
Silane Coupling ◽  
Modified Attapulgite ◽  
Scanning Electron

Attapulgite is a natural rod-like nanomaterial. The surface of natural attapulgite nanoparticles was cleaned, modified with silane coupling agent 3-aminpropyltriethoxysilane (KH550). The structure and morphology of the modified attapulgite were characterized by infrared spectroscopy, scanning electron microscope (SEM). The methane absorption capacity of the modified attapulgite was recorded by intelligent gravimetric analyzer. SEM revealed that 3-aminpropyltriethoxysilane was modified on the surface of rod-like attapulgite nanoparticles. The 3-aminpropyltriethoxysilane can obviously increase the methane absorption capacity of the nanoparticles almost about twice. This result may provide the attapulgite nanoparticles a new way to industrial application.

ENHANCED CALCIUM PHOSPHATE PRECIPITATION ON THE SURFACE OF Mg-ION-IMPLANTED ZrO2 BIOCERAMIC

2007 ◽  
Vol 14 (01) ◽  
pp. 71-77 ◽  
Author(s):  
H. LIANG ◽  
Y. HUANG ◽  
F. HE ◽  
H. F. DING ◽  
Y. Z. WAN
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Calcium Phosphate ◽  
Body Fluid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Phosphate Precipitation ◽  
Scanning Electron ◽  
Ion Implanted

Modification of bioceramics by ion implantation of magnesium ( Mg ) is of interest as Mg is the fourth abundant cation in the human body. In this work, magnesium was ion-implanted into a ZrO 2 based bioceramic stabilized with Y 2 O 3 and Al 2 O 3. Both Mg -implanted and unimplanted samples were soaked in a simulated body fluid (SBF) for a period of time. The deposits on the surface of various samples were characterized with scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). We find that the Mg -implanted ZrO 2 shows better bioactivity than the plain bioceramic. These results indicate that Mg -implantation can improve the bioactivity of the ZrO 2 based bioceramic. Mechanisms governing the improvement are discussed in this paper.

scholarly journals Penggunaan ZnO/zeolit sebagai katalis dalam degradasi tartrazin secara ozonolisis

2021 ◽  
Vol 12 (1) ◽  
pp. 53-64
Author(s):  
Zilfa Zilfa ◽  
Safni Safni ◽  
Febi Rahmi
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Natural Zeolite ◽  
Zeolite Catalyst ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zeolite Structure ◽  
Scanning Electron

An investigation on modification of natural zeolite with ZnO for the degradation of tartrazine. In this study, ZnO as a semiconductor is modified into a natural zeolite as support to form ZnO/zeolite that can increase the efficiency degradation of tartrazine. Further, the formed catalyst was added to tartrazine by determining the variation in ozonolysis time, the amount of addition of the catalyst, and the addition of a catalyst time. The results of degradation were determined by UV-Vis spectrophotometer at 424 nm. The result showed that the percentage of degradation obtained on each catalyst in the degradation. The resulted percent degradation of 20 ml of tartrazine at concentration of 15 mg/L using 20 mg ZnO/zeolite was 56.80%, while using 0.77 mg ZnO was 42.25%, and with the addition of 19.23 mg of Zeolite was 31.18%, all of that condition was proceeded by 40 minutes of ozonolysis. Thus, the result indicates that the ZnO/zeolite catalyst can increase percentages of tartrazine degradation by ozonolysis. It is known that the catalyst ZnO/zeolite is very effective in increasing the degradation of tartrazine. Analysis of tartrazine compounds using fourier-transform infrared spectroscopy (FTIR) after degradation changes in wavenumber indicates that there is a breaking of the bonds of tartrazine compounds. Characterization of ZnO/zeolite catalyst using FTIR, X-Ray diffraction (XRD) and scanning electron microscope (SEM), in each spectrum there was no shift, indicating that there is no change in ZnO/zeolite structure

PENINGKATAN DAYA SERAP SERAT POLIESTER MENGGUNAKAN SELULOSA BAKTERIAL

Arena Tekstil ◽  
2016 ◽  
Vol 28 (1) ◽  
Author(s):  
Srie Gustiani ◽  
Rifaida Eriningsih
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Acetobacter Xylinum ◽  
Moisture Regain ◽  
Scanning Electron

Poliester mempunyai beberapa keunggulan seperti tahan kusut, mudah pemeliharaannya dan relatif awet, namun kurang nyaman dipakai terutama pada kondisi tropis karena daya serapnya rendah dengan moisture regain (MR) 0,4%. Tujuan penelitian ini adalah merubah sifat hidrofob kain poliester menjadi hidrofil untuk meningkatkan daya serapnya. Proses dilakukan dengan cara melapisi selulosa bakterial melalui proses perendaman kain dalam bakteri selulosa (Acetobacter xylinum) dalam medium air kelapa, selama 3 hari, 6 hari, 9 hari dan 12 hari. Selanjutnya dilakukan proses fiksasi dan pemurnian dengan NaOH 3%. Produk yang dihasilkan kemudian dilakukan pencucian berulang dengan mesin lounder O-meter sebanyak 1, 2 dan 3 kali atau setara dengan 5, 10 dan 15 kali pencucian dengan mesin cuci rumah tangga. Dari beberapa pengujian diketahui bahwa semakin lama waktu perendaman, MR dan daya serapnya semakin meningkat, namun kekuatan tarik mengalami sedikit penurunan. Dari analisa morfologi dengan Scanning Electron Microscope terlihat bahwa  dengan perendaman selama 6 hari sudah jelas terlihat lapisan selulosa bakterial yang menyelubungi serat dengan rata yang juga dibuktikan pada serapan gugus fungsinya pada Fourier Transform Infrared Spectroscopy (FTIR) dan hasil pencelupan dengan zat warna reaktif. Kondisi optimum diperoleh pada perendaman 6 hari dan setelah pencucian berulang 2 kali dengan mesin lounder O-meter (setara dengan10 kali pencucian rumah tangga), yaitu MR meningkat dari 0,4 % menjadi 1,02 % dan waktu penyerapan  dari 96,64 detik menjadi 4,22 detik.

Preparation and Surface Modification of Fe3O4@Sio2 Composite Microspheres

2012 ◽  
Vol 455-456 ◽  
pp. 115-120
Author(s):  
Kui Zhou ◽  
Ming Yang ◽  
Qian Sun ◽  
Zhi Zuo Yang
Keyword(s):  
Fourier Transform ◽  
Silane Coupling Agent ◽  
Magnetic Particles ◽  
Composite Particles ◽  
Magnetic Response ◽  
X Ray ◽  
Composite Microspheres ◽  
Silane Coupling ◽  
Magnetic Fe3o4 ◽  
Scanning Electron

Magnetic Fe3O4@SiO2 composite microspheres were prepared using hydrolyzation of tetraethoxysilane and Fe3O4 nanoparticles as seeds, and then the resultant composite particles were modified with silane coupling agent 3-methacryloxypropyltrimethoxy silane. The products were characterized by scanning electron microscope, X-ray powder diffraction, fourier transform infrared spectroscopy, and vibrating-sanple magnetometry, respectively. The results clearly show that the magnetic particles have favorable superparamagnetism and remain strong magnetic response. Moreover, the duplex bonds of carbon functional groups from 3-methacryloxypropyltrimethoxy silane was introduced onto the suface of Fe3O4@SiO2 composite particles.

Preparation of Magnetic Chitosan/Iron (II, III) Oxide Microspheres and Application in Adsorption of Cr (VI)

2011 ◽  
Vol 130-134 ◽  
pp. 989-993
Author(s):  
Bing Hu ◽  
Jin Lei Li
Keyword(s):  
Aqueous Solution ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Magnetic Microspheres ◽  
Magnetic Chitosan ◽  
Adsorption Performance ◽  
Scanning Electron ◽  
Carbamide Solution

In this study,the chitosan (CS) -iron (Ⅱ,Ⅲ) oxide magnetic microspheres were prepared by crosslinking and coprecipitating with carbamide solution as precipitated agent.,and characterized by means of scanning electron microscope (SEM) and Fourier Transform infrared spectroscopy (FTIR ). The adsorption performance of the magnetic microspheres for remove Cr (VI) from aqueous solution was investigated.The experimental results demonstrated that the optimum of pH,time for adsorption of Cr (VI) was 3.3,120min at 25°C,respectly.

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