http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
수용액 내 캐올리나이트와 할로이사이트의 표면화학 특성: 표면복합반응 모델링
장세정 ( Sae Jung Chang ),김수진 ( Soo Jin Kim ) 한국광물학회 2004 광물과 암석 (J.Miner.Soc.Korea) Vol.17 No.2
The surface chemical properties of aqueous kaolinite and halloysite were studied using a potentiometric titration experiment and a computer program FITEQL3.2. Among the surface complexation models a constant capacitance model was selected for this study. The 2 sites - 3 pK_(as) model, in which the surfaces were assumed to have tetrahedral and octahedral sites, was reasonable for the description of the experimental data. The surface charges of both minerals were negative above pH of 4. The higher the pH, the lower the proton surface charge densities of both minerals. The ≡SiO^- site played an important role in cation adsorption in acid and neutral pH range; whereas the ≡AlO^- site was in an alkaline pH range. The optimized intrinsic constants of kaolinite, pK_(a₂(si))^(int), pK_(al(Al))^(int), and pK_(a₂(Al))^(int) were 4,436, 4.564, and 8.461, respectively, and those of halloysite were 7.852, 3.885, and 7.084, respectively. The total Si and Al surface sites concentrations of kaolinite were 0.215 and 0.148 mM, and those of halloysite were 0.357 and 0.246 mM. The ratio of Si and Al surface site densities
해남 공룡화석지 퇴적암의 물리적 성질 - 쳐트 함량과의 관계 -
김수진(Soo Jin Kim),장세정(Sae Jung Chang),조현구(Hyen Goo Cho) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.2
The physical properties of Uhangri sedimentary rocks were investigated to provide the conservation strategy of Dinosaur trace fossil in the Haenam. The porosity, void ratio, dry density, water content, and degree of saturation were calculated according to the proper laboratory experiments for 9 sedimentary specimens. The flexural strength (or modulus fo rupture) and thermal expansion coefficient were measured using the universal testing machine and dilatometer, respectively. The Uhangri sedimentary rocks have very low porosity, void ratio, and water content, The flexural strength of shales are 24.16∼42.84, and those of sandstones are 16.34∼43.52 N/mm^2, which are much weaker than common sedimentary rocks. The very low flexural strength of sedimentary rocks despite very low porosity, is ascribed to fine fissures in the rocks. The thermal expansion coefficient of rocks were 14.7∼21.3×10^-6, which are 2∼2.5 times as high as alumina and about 10 times as high as talc. As the content of chert in the sandstone increases, the porosity, void ratio, and water content increase, while the dry density and degree of saturation decrease. The chert-bearing sandstone have higher porosity and thermal expansion coefficient, and lower flexural strength compared to those free of chert.