• 공업화학
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• 제20권3호
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• pp.346-350
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• 2009

자연상태의 물질들은 많은 유용한 성분들을 포함하고 있다. 이 성분들 중에서, 천연 영양 성분들은 기능성 식품 또는 화장품, 의약품의 첨가제로써 활용 되고 있다. 이러한 영양성분들을 유용하게 활용하기 위해 각 성분들에 대한 최적의 용매 선택방법을 제시하였다. 각 성분에 대한 용해도 파라미터를 계산하였으며 총 용해도 파라미터는 분산성, 극성, 수소결합 효과로 구성되고 이들 기여도가 각각 계산되었다. 용질과 용매의 용해도 파라미터에 의해 chi(${\chi}_{12}$)파라미터가 결정되었으며 chi파라미터에 의해 아미노산 성분들에 대한 최적의 용매-용질쌍이 선정되었다.

• 대한화장품학회지
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• 제24권3호
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• pp.105-110
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• 1998

In the make-up product, Eye-shadow products have several purposes of enhancing product quality such as providing the beauty (variation of shape, clean appearance), feeling, continuity and adhesion. In this paper, newly developed wet type back injection press process is introduced so as to increase higher value products which providing various the beauty. The solvent takes an essential role to provide the fluidity of the powder bulk during the pressed-process of wet type pressed product. In this study, the effect of solvent in the oil binder was investigated, And the higher quality condition of the wet type pressed product was built to apply cosmetic preparation. Firstly, the system was designed powder phase as non treated pigment. The oil binder phase is categorized as hydrocarbons(Mineral oil, Squalane), Silicones(Methicone, Dimethicone ), esters (Octyldodecanol, Octyl Dodecyl Myristate). The solvent phase used was C 7-8 isoparaffin and Isopropyl Alcohol. The interaction of oil binder and solvent is investigated by measuring mass of final oil binder and the each solubility parameter. It was found that the higher the solubility the higher the degree of change in the final composition of the oil binder. In order to maintain the quality of the final product, the solvent used in pressed-process should be hydrophobic with oil binder.

• 한국결정성장학회지
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• 제23권1호
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• pp.31-36
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• 2013

친수성과 소수성을 동시에 갖는 아세틸화 셀룰로스 에테르(ACE)를 합성하여 유기용매 용해도 및 거동 평가와 물에 대한 젖음성을 평가하였다. 친수성 고분자인 셀룰로스 에테르에 에스테르화 반응을 통해 아세틸기를 치환시켰으며, FT-IR 분석결과 수산화기의 감소와 카르복실산의 증가를 통해 아세틸화 반응을 확인하였다. 열분해 거동 분석결과 $800^{\circ}C$까지 셀룰로스와 셀룰로스 에테르와 유사한 분해거동을 보여 셀룰로스 주사슬의 구조변화 없이 치환 반응이 일어난 것을 확인하였다. 18.5~26.4의 solubility parameter의 값을 예상할 수 있는 ACE는 유기용매의 solubility parameter 값에 의해 탁도와 점도가 결정되었다. 합성한 ACE의 접촉각은 셀룰로스 에테르 보다 높은 값을 보였으나 시간에 따른 접촉각 변화는 유사한 경향을 보였다. 이는 치환된 아세틸기에 의한 소수성, 무수 글루코스 단위체 내의 반응하지 않고 잔존하는 수산화기에 의해 친수성을 동시에 가지는 것을 알 수 있었다.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제3권2호
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• pp.131-136
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• 1999

The solubility of H2S is an important parameter for modeling H2S absorption. Since the direct measurement of H2S solubility in aqueous amine solutions is impossible, this work initially attempted to develop an H2S analogy method, however, this was unsuccessful. Consequently, H2S solubilities were measured in aqueous amines which were completely protonated with HCI over a temperature range of 25-60℃. The solvents investigated in this work included 0-50% aqueous solutions of methyldiethanolamine and diethanolamine. Thereafter, a new empirical correlation was developed that can predict Henry's constant for H2S using only the solubility of H2S in water and t도 molecular weight of the aqueous solvent.

• 멤브레인
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• 제31권2호
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• pp.153-159
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• 2021

최근 들어 여러 산업 분야에 활발히 사용되고 있는 고분자 분리막은 화학구조의 제어나 제막공정에서의 물리적 특성 제어뿐만 아니라 다양한 소재와 혼합된 복합막 제조를 통해서 고유의 특성을 부여할 수 있는 장점을 가지고 있다. 본 연구에서는 분리막 제조 시에 누에(Bombyx mori)가 생산한 친환경 천연소재로 활용 가능성이 넓은 실크 고분자의 복합막 제조 시 다른 소재와의 혼화성 지표로 사용할 수 있는 용해도 파라미터를 분자동역학을 이용하여 계산하였다. 역시 친환경성 및 생체적합성을 갖고 있는 polyvinylalcohol (PVA)의 용해도 파라미터를 분자동역학을 이용하여 계산 후 서로 비교하였을 때 두 고분자 소재가 비슷한 용해도 파라미터 값을 갖는 것을 확인하였다. 결론적으로, 두 고분자가 서로 잘 혼합될 수 있음을 이론적으로 증명하였고, 실제 실험을 통해서도 이를 확인할 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제30권8호
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• pp.1749-1754
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• 2009

Solubilities of carbon dioxide (C$O_2$) in a series of fluorine-free room temperature ionic liquids (RTILs), dialkylimidazolium dialkylphosphates and dialkylimidazolium alkylphosphites, were measured at 313∼333 K and pressures up to 5 MPa. Henry’s law coefficients as the solubility parameter of C$O_2$ in RTILs were derived from the isotherm of fugacity versus C$O_2$ mole fraction. The C$O_2$ solubility in a phosphorus-containing RTIL was found to increase with the increasing molar volume of the RTIL. In general, dialkylimidazolium dialkylphosphate exhibited higher absorption capacity than dialkylimidazolium alkylphosphite as long as the RTILs possess an identical cation. Among RTILs tested, 1-butyl-3-methylimidazolium dibutylphosphate [BMIM][B$u_2PO_4$] and 1-butyl-3-methylimidazolium butylphosphite [BMIM][BuHP$O_3$] exhibited similar Henry’s law coefficients to 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide ([BMIM][T$f_2$N]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][B$F_4$]), respectively. The Krichevsky-Kasarnovsky equation was employed to derive the C$O_2$ solubility parameter (Henry’s law coefficient) from the solubility data measured at elevated pressures.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.108-108
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• 2009

ITO에 사용되는 주된 재료인 인듐의 bixbyite 구조는 TCOs의 전기적 특성에서 매우 중요한 것으로 알려져 있다. 때문에 인듐의 Bixbyite구조를 유지하면서 인듐의 사용량을 줄이기 위해 최적의 Solubility limit에 관해 연구하였다. 이를 위해 In2O3-ZnO-SnO2의 삼성분계 기본 조성에 두가지 물질을 추가로 첨가하여 첨가량에 따른 Solubility limit을 연구하였다. Solubility limit의 측정을 위해 X-ray Diffractometer(XRD)를 사용하였으며, 첨가 원소의 양이 증가할수록 TCOs target의 Latice parameter값은 작아졌다, SEM을 통한 미세구조의 관찰로 원소첨가에 따른 샘플의 소결에너지 변화를 분석할 수 있었다. 제작된 시편의 정성분석 및 Chemical binding Energy를 측정하기 위해 X-ray Photo Spectroscopy (XPS)를 이용하였으며, 전기적인 특성 측정을위해 4-Point prove mesurement 방법을 사용하였다.

• Archives of Pharmacal Research
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• 제20권3호
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• pp.269-274
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• 1997

Solubilities of oleanolic acid and ursolic acid in aqueous surfactant solutions, liquid polyethylene glycols (PEG), and solvents of various polarity were measured. The results showed that the solutes were slightly or moderately solubilized in the surfactant solutions and the liquid PEGS. It was also revealed that the solutes were slightly soluble in the solvent of either extreme polarity or nonpolarity, but moderately soluble in solvents of intermediate polarity of which solubility parameters are around 10. The solubility parameters of these solutes were calculated from the group contribution to be 10.2 for both of them. Of the solvents tested, tetramethylurea was exceptionally effective in solubilizing the solutes. The solutes were also moderately soluble in the aqueous cosolvents containing tetramethylurea. This suggests that the mixed systems of tetramethylurea could be employed for the solubilization in the formulation of these compounds as an aqueous system.

• 한국환경과학회지
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• 제7권6호
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• pp.753-759
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• 1998

In physical and reactive extraction of acrylic acid using various solvents the equilibrium characteristics of extraction were investigated. The degree of extraction in reactive extraction with Tri-n-octylamine(TOA) was 1.5~3 times than that in physical extraction. Distribution ratio was constant in methyl isobutyl ketone(MIBK) and n-butylacetate(n-BAc) but was increased with increasing the concentration of acrylic acid in benzene and chloroform. It can be explained by formation of dimers. Maximum extraction leadings of acrylic acid were three in benzene and were two in MIBK, chloroform and n-BAc, and it was found that acrylic acid was extracted as the form of $A_3$R In benzene and $A_2R$ in MIBK, chloroform and n-BAc. In effect of solvent, the degree of extraction was increased as he difference of solubility parameter of solvent and solute was decreased, and as dielectric constant of solvent was increased.

• 펄프종이기술
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• 제31권1호
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• pp.61-71
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• 1999

The study aimed at the theoretical analysis of vapor sorption properties of, pp.rmaking fibers. Water vapor affinity and sorption thermodynamic properties of fiber constituents were evaluated based on Henry's law and Hildebrand's solubility theory. Theoretical equilibrium moisture content(ThEMC) on fiber surface was estimated using functional group contribution. Crystallinity of cellulose in fiber significantly controlled the water vapor solubility. Comparisons of the measured equilibrium moisture content data and the estimated ThEMC data coincidently suggested the fact that crystallinity of cellulose in fibers was around 60% to 70%. Carbohydrates constituents including amorphous cellulose and hemicellulose in fibers showed higher vapor solubility than lignin molecules. High correlation existed between ThEMC and vapor solubility as well as between ThEMC and solubility parameter. In the thermodynamic analysis on water-vapor sorption process in fibers, the sorption enthalpy increased as RH increased, whereas sorption entropy and free energy decreased with increasing RH.