• Bulletin of the Korean Chemical Society
• /
• 제7권2호
• /
• pp.154-155
• /
• 1986

• Bulletin of the Korean Chemical Society
• /
• 제26권4호
• /
• pp.645-651
• /
• 2005

• 한국환경농학회지
• /
• 제3권2호
• /
• pp.50-54
• /
• 1984

K완효성 비료개발을 위해 $K^+$로 이온교환된 montmorillite를 규정하고 n-alkylammonium method에 의한 충전하 결정을 통해 그 특성을 확인하있다. 이 방법을 통해 결정내의 불균일한 전하분포를 식별하고 충전하 상하영역을 평가했다(충전하는 영일 bentonite에 국한 : ${\xi}=0.39-0.28e/(SiAl)_4O_{10}$, ${\xi}=0.34$). 그리고 층간 양이온 교환능(C.E.C.) 평균가는 0.915meq/100g임을 알았다.

• Bulletin of the Korean Chemical Society
• /
• 제21권3호
• /
• pp.317-320
• /
• 2000

Layered $K_2NiF_4$type ($C_nH_{2n+1}NH_3)_2PbCl_4$(n=6, 8 and 10) system, or alkylammonium tetrachloroplumbate compound, has been synthesized from $PbCl_2$ and $C_nH_{2n+1}NH_3Cl$ solutions under argon ambient pressure for 12hrs at $90^{\circ}C$. The crystal structure of the compound has been analyzed using X-ray powder diffaction in the range of $5^{\circ}{\leq}2{\theta}{\leq}55^{\circ}$, and all samples assigned to an orthorhombic system. Local distances of the Pb-Cl bond have been determined by Pb $L_{III}$-edge extended X-ray absorption fine structure (EXAFS) spectroscopy. The vibration modes of alkylammonium chains and the absorpton peaks of an excition have been examined by FT-IR and UV-Vis. reflectance spectra, respectively. The phase transition temperatures of the compounds have been studied by using DSC. According to the thermal analysis, two phase transition temperatures have been observed in the compositons of n=8 and 10.

• 약학회지
• /
• 제21권3호
• /
• pp.135-140
• /
• 1977

Solubilization of cholesterol, its fatty acid esters and gallstones were undertaken employing nonionic, anionic and cationic surfactants. Cholesterol was effectively solubilized by all of these surfactants. Cationic surfactants were most effective. However, cholesteryl myristate was not solubilized at all. In the dissolution test of gallstones in surfactant solutions, cationic surfactant solutions were exceptionally effective in dissolving gallstones. These results suggest the possible existence of interaction between alkylammonium radical and cholesterol on micellar surface.

• 한국결정성장학회지
• /
• 제15권2호
• /
• pp.86-91
• /
• 2005

층상 구조의 유기-무기 페로브스카이트 복합 소재 $(C_nH_{2n+1}NH_3)_2CuC1_4$ (n=6, 8, 10, 12)을 합성하였다. $(C_nH_{2n+1}NH_3)_2CuC1_4$ 화합물에서 긴 사슬의 양성자화된 알킬 암모늄 이온은 기울어진 이중층의 구조로 $CuCl_6$ 팔면체의 구석을 공유하고 있는 페로브스카이트형의 층들 사이에의 삽입되었다. 페로브스카이트 층상 화합물에서의 3개의 고체상을 HT-XRD와 DSC를 사용하여 조사하였다. $(C_nH_{2n+1}NH_3)_2CuC1_4$ 화합물은 단계적인 층간거리의 증가와 함께 고체-고체 상전이 현상을 보여준다 3개의 다른 구조는 긴 사슬의 양성자화된 알킬 암모늄 이온의 형태 변화로 설명하였다.

• 약학회지
• /
• 제20권3호
• /
• pp.156-161
• /
• 1976

The salting in and salting out of Octoxynol, N.F., a nonionic polyoxyethylated surfactant by n-alkylamine hydrochlorides ws investigated by measuring their effect on the cloud point of the surfactant at various salt concentrations. The carbon number of the alkyl chain was varied from zero to twelve. Ammonium chloride, methylamine hydrochloride and ethylamine hydrochloride tended to salt out the surfactant, lowering its cloud point in proportion to the salt concentration. n-Ankylamine and n-butylamine hydrochlorides showed salting-out effect at low concentrations of the electrolyte, while their effects were leveled off and showed rather salting-in trend at higher concentrations of the electrolyte. These salting-in effect was ascribed to the formation of a hydrotropy of the n-alky lammonium cations with the surfactant. The higher homolog compounds of n-alkylamine hydrochlorides showed extraordinarily high salting-in effect at very low oncentrations of the electrolyte. These large salting-in effects were more drastic as the chain length was getting longer. These large increases of the cloud point of the surfactant were attributed to the formation of mixed micelles of n-alkylammonium cations with the polyoxyethylated surfactant.

• 한국고분자학회:학술대회논문집
• /
• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
• /
• pp.280-280
• /
• 2006

Na-bentonite (local clay mineral) and Na-montmorillonite were treated with quaternary alkylammonium cations. The effect of the molecular structure and functional groups of the surfactants on the organoclays was investigated by X-ray diffraction (XRD). For the preparation of nanocomposites, organoclays were melt-blended with polypropylene in a twin screw extruder and $Surlyn^{(R)$. ionomer was used as a reactive compatibilizer. The clay dispersions in the composites were investigated by X-ray diffraction (XRD). XRD spectra showed no peak at low angle indicated that the silicate clay layer has a nearly exfoliated dispersion in the polymer matrix. Thermal and mechanical properties of nanocomposites were higher than those of PP.

• 공업화학
• /
• 제10권6호
• /
• pp.960-962
• /
• 1999

Sodium montmorillonite($Na^+$-MMT)와 알킬 암모늄 브로마이드(스테아릴트리메틸 브로마이드와 세틸트리메틸 브로마이드)를 일정한 온도와 가압하에서 고체-고체 반응시켜 유기 montmorillonite(MMT)를 합성하였다. 고체-고체 반응에 의해 얻어진 복합체는 통상적인 수용액법에 의해 얻어진 복합체와 유사하였다.

• Bulletin of the Korean Chemical Society
• /
• 제22권11호
• /
• pp.1248-1254
• /
• 2001

The conformations and energies of p-tert-butylcalix[4]crown-6-ether (1) and its alkyl ammonium complexes have been calculated by ab initio HF/6-31G quantum mechanics method. The cone conformation was found to be most stable for free host 1. We hav e determined the binding site of these host-guest complexes focusing on the crown-6-ether or p-tert-butylcalix[4]arene pocket of the cone conformation of host molecule 1. The primary binding site of host 1 for the recognition of alkyl ammonium guests was confirmed to be the central part of the crown moiety of cone conformation. The complexation energy calculations revealed that the ammonium cation without alkyl group showed the highest complexation efficiency when combined with host 1, that is in satisfactory agreement with the experimental results.