scholarly journals Studies on polymers filled with particles. V. Effect of void volume on the tensile modulus of oriented polypropylene filled with surface modified calcium carbonate.

1986 ◽  
Vol 43 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Kazuta MITSUISHI ◽  
Soji KODAMA ◽  
Hitoshi KAWASAKI
Keyword(s):  
Calcium Carbonate ◽  
Tensile Modulus ◽  
Void Volume ◽  
Oriented Polypropylene ◽  
Surface Modified

Emulsifying Effect of Solid Particles on Epoxy Resin E-44

2011 ◽  
Vol 233-235 ◽  
pp. 337-343
Author(s):  
Li Xin Zhou ◽  
Jun Xia Wang ◽  
Chu Ping Ye ◽  
Ling Lan Li ◽  
Chang Li Lu
Keyword(s):  
Calcium Carbonate ◽  
Epoxy Resin ◽  
Disperse Phase ◽  
Solid Particles ◽  
Experimental Results ◽  
Multiple Emulsion ◽  
Aqueous Emulsion ◽  
Aerosil Surface ◽  
Result Show ◽  
Surface Modified

Emulsify epoxy resin E-44 with heavy calcium carbonate, light calcium carbonate, aerosil, surface-modified aerosil and bentonite BP-187. The experimental results show that neither heavy calcium carbonate nor light calcium carbonate has emulsifying effect. O/W type emulsion can not be obtained with aerosil and bentonite BP-187. Surfactant-modified aerosilCTAB-SiO2and DTAB-SiO2do have emulsifying effect, and they can transform into more stable O/W type emulsion. The synergy between BP-17, EP-1 and CTAB-SiO2is obvious. Hydrophilic emulsifier EP-1 could be replaced by CTAB-SiO2or BP-187 completely or partly to prepare stable O/W emulsion. The TEM result show that the disperse phase of the emulsion produced by CTAB-SiO2and the compound emulsifier of CTAB-SiO2and BP-187 is irregular floc, and the disperse phase of the aqueous emulsion produced by the compound emulsifier of CTAB-SiO2and EP-1 is regular globular or ellipsoidal multiple emulsion.

Polyaminoamide dendrimers surface-modified with anionic terminal groups for use as calcium carbonate scale inhibitors

2014 ◽  
Vol 34 (8) ◽  
pp. 733-738
Author(s):  
Fu Chen ◽  
Keying Wu ◽  
Yangyang Liu ◽  
Huaping Huang ◽  
Kunyi He
Keyword(s):  
Calcium Carbonate ◽  
Bath Temperature ◽  
Fourth Generation ◽  
Sodium Acrylate ◽  
Amorphous Calcium Carbonate ◽  
Chemical Structures ◽  
Scale Inhibition ◽  
Study Results ◽  
Surface Modified ◽  
Calcium Carbonate Scale

Abstract Polyaminoamide dendrimers (PAMAM) surface-modified with anionic terminal groups (PIY) for use as scale inhibitors were prepared with the fourth-generation PAMAM and sodium acrylate (SAA), via the Michael addition reaction. The chemical structures of PIY were determined using Fourier transform infrared (FT-IR) spectrometry and 1H nuclear magnetic resonance (NMR) spectra. The influence of scale inhibitor concentration, Ca2+ concentration and bath temperature on the scale inhibition efficiency was researched. The study results signified that PIY can resist calcium carbonate scale as high as 92.8%. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) patterns showed that amorphous calcium carbonate had generated in the presence of PIY dendrimers.

Effect of Anionic Surfactant on Adsorption Properties of Nano Calcium Carbonate

2018 ◽  
Vol 281 ◽  
pp. 830-835 ◽  
Author(s):  
Qing Li Ren ◽  
Qiang Luo ◽  
Feng Lei Wang
Keyword(s):  
Calcium Carbonate ◽  
Sodium Dodecyl Sulfate ◽  
High Surface ◽  
Sodium Dodecyl ◽  
Langmuir Model ◽  
Phase Method ◽  
Adsorption Performance ◽  
Dodecyl Sulfate ◽  
Superior Surface ◽  
Surface Modified

Because of its superior surface properties, nanocalcium carbonate can be applied to the adsorption of heavy metals in wastewater. However, because of the easy aggregation of nanocalcium carbonate, high surface energy and poor dispersibility in water, it is not conducive to the process of adsorption. Therefore, surface modification of nanocalcium carbonate is needed. In this paper, nanocalcium carbonate was prepared by liquid phase method. And the nanocalcium carbonate was surface modified by sodium dodecyl sulfate. The effects of modifier amount, modification temperature, and modification time on the activation and absorbance of nanocalcium carbonate were investigated. And the morphology and particle size of modified nanocalcium carbonate were tested by SEM and XRD patterns.The results show that the dispersion and surface activity of the modified nanocalcium carbonate have been improved remarkably. Moreover, the Cu2+ was adsorbed by sodium dodecyl sulfate modified nanocalcium carbonate and unmodified nanocalcium carbonate under the optimum modification conditions. And the effects of nanocalcium carbonate initial concentration on the adsorption performance were studied. The results show that the adsorption performance of modified calcium carbonate is better than that of the unmodified. Moreover, the adsorption process is studied by adsorption isotherm. By drawing the adsorption isotherms lines and by comparing the fitting result of the experimental data based on the Langmuir model and that of Freundlich model, it is found that the adsorption of Cu2+ by modified nanocalcium carbonate meets the Langmuir model.

Utilisation of Titanium and Titanium Dioxide as Scaffolds for Proliferating Coral Reef

2021 ◽  
Vol 1016 ◽  
pp. 1497-1502
Author(s):  
Masato Ueda ◽  
Chihiro Sawatari ◽  
Tomoyuki Takahashi ◽  
Hiroaki Tsuruta ◽  
Hidenobu Tokushige ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Coral Reef ◽  
Calcium Carbonate ◽  
Coral Reefs ◽  
Artificial Seawater ◽  
Inorganic Substance ◽  
Restoration Techniques ◽  
Surface Modified ◽  
Dioxide Film ◽  
Planula Larva

Estimated 30 percent or more of coral reefs are now in danger of extinction by coastal construction increases and global temperatures rise. Several restoration techniques such as fragmentation, forming, Biorock have been developed in the past few years. In vertebrates such as mammals, osteoblast is known to form the bones composed of hydroxyapatite. Therefore, bone substitutional devices are generally surface modified to improve the adhesion of osteoblasts on the surfaces. Titanium dioxide film is often employed as the surface material for hard tissue substitutes made of titanium and its alloys. In hard corals, on the other hand, the soft tissue covered on the skeletons made of calcium carbonate has osteoblasts as well. The purpose of this work was to investigate the potential of titanium (Ti) and titanium dioxide (TiO2) as scaffolds for proliferating coral reefs by analysing the several interfacial reactions. The rods of pure Ti were anodised in aqueous phosphoric acid at a constant voltage of 80 V. The surfaces were confirmed to be anatase type TiO2. The coral fragments were kept in contact with the rods in a lab-scale aquarium with artificial seawater for several days. The colony of polyps vigorously expanded on the surfaces. Fragments of coral were placed on pure Ti, TiO2 coated pure Ti in Petri dishes and were reared in artificial seawater. Fine spherical precipitates of calcium carbonate with aragonite structure, which is the same inorganic substance as corals, were observed radially and regularly on the surfaces of TiO2. In addition, the adherence of planula larva to the sputtered TiO2 film was observed by using a QCM (Quartz Crystal Microbalance) method. The approach and adhesion of planula larva to the surface could be detected by monitoring the resonance frequency and resistance. The surfaces might have a great potential in coral reef regenerations.

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