키토산의 조제와 응집효과에 관한 연구

盧承宇,金載錄 충주대학교 산업대학원 2002 大學院論文輯 Vol.3 No.-

The degree of deacetylation are decreased with increasing removal time of calcium carbonate and increased with increasing reaction temperature and reaction time. The viscosity average molecular weight are decreased with increasing reaction temperature and reaction time of deacetylation. When we consider the change of pH at constant input of chitosan, the optimazed pH is 4, and the flocculation effect also is order of c > b > a for COD, SS, permeability, and Zeta potential. When we consider the change of input chitosan at optimazed pH condition, the optimazed concentration of input chitosan is 10ppm, and the flocculation effect also is order of c > b > a for COD, SS, permeability, and Zeta potential. The removal of color is excellent, as the viscosity average molecular weight is high. The minimum removal of color is 78 percentage. From this result, we identified the possibility of excellent natural polymer flocculation agent.

八面體對稱의 强結晶場內의 電子系에 對한 NMR 化學移動에 關한 硏究

노승우 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.2

A general expression using the nonmultipole expansion method is drived for the NMR shift arising from 3d electron angular momentum and the 3d electron spin dipolarnuclear spin angular momentum interactions for a system in a strong crystal field environment of octahedral symmetry when the threefold axis is chosen as the quntization axis. The NMR shift is separated to the contribution of constant, terms and compared with the multipolar terms. I find that term contributes dominantly to the NMR shift but the contribution of term maay not be negligible. It is also found that the exact values of the NMR shift are in agreement with the mult- ipolar results for distances larger than 0.34 nm.

The Study on the Calculated Dipole Moments for the Dimethylplatinum(Ⅳ) Complexes

盧承宇 忠州大學校 1994 한국교통대학교 논문집 Vol.29 No.2

판면체 구조의 전이 금속 착물들에 대한 쌍극자 모멘트를 계산하는 데 수정된 EHT(확장된 H??ckel이론) 방법을 이용하였다. [PtCl₂Me₂(PMe₂Ph)] 형태의 디메틸 백금(IV) 착물에는 6가지 [(I)-(IV)]의 가능한 입체 이성질체들이 있다. 이성질체(II)에 대하여 계산한 쌍극자 모멘트의 값(5.44D)은 이성질체(II)에 대하여 계산한 쌍극자 모멘트 값(6.46D)보다 낮은 값을 얻었다. 이성질체(II)에 대해 게산한 쌍극자 모멘트 값은 이성질체(II)에 대한 것보다 실험값(5.3D)에 더 접근하였다. 이와같이, 계산한 쌍극자 모멘트 값을 이용하여 그 착물의 입체화학적 구조를 예상할 수 있을 것으로 기대된다.

Rapid Electrochemical Aptasensor Composed of Mxene/Aptamer Nanostructure on Au micro-gap electrode for COVID-19 Detection

노승우,이택 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.1

트리메틸 有機白金(IV)[PtClMe₃(PMe₂Ph)₂] 錯物에 대한 雙極子 모멘트에 關한 硏究

盧承宇 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.2

八面體 構造를 갖는 轉移金屬 錯物들에 대한 雙極子 모멘트를 EHT(擴張된 Huckel이론)計算으로부터 얻은 分子 軌道函數를 使用하여 計算하였다. 八面體 트리메칠 有機白金(Ⅳ) [PtClM₃(PMe₂Ph)₂] 形態錯物에는 3가지의 立體 異性質體가 있다. 特히 fac-[PtClM₃(PMe₂Ph)₂] 形態 錯物은 實驗値(7.1D)에 매우 近接하였다. 따라서 벤젠溶液에서 八面體 트리메칠 有機白金(Ⅳ) [PtClM₃(PMe₂Ph)₂] 形態 錯物은fac-[PtClM₃(PMe₂Ph)₂] 形態로 存在할 것으로 豫想된다.

4d¹전자계에 대한 NMR 화학적 이동에 관한 연구(제 2보)

盧承宇 忠州大學校 1988 한국교통대학교 논문집 Vol.22 No.-

The NMR chemical shift arising from 4d electron angular momentum and 4d electron spin dipolar-nuclear spin angular momentum interactions for a 4d?? system in a strong crystal field environment of trigonal symmetry, when the threefold axis is chosen to be the axis of quantization axis, has been examined. A general expression using the nonmultipole expansion method (exact method) is derived for the NMR chemical shift. From this expression all the multipolar terms are determined. We observe that along the (100). (010), (110), and (111) axes the NMR chemical shifts are positive while along the (001) axis, it is negative. We observe that the dipolar term (1/R??) is the dominant contribution to the NMR chemical shift except for along the(111) axis. A comparison of the multipolar terms with the exact values shows also that the multipolar results are exactly in agreement with the exact values around R≥0.2 run. The temperature dependence analysis on the NMR chemical shifts may imply that along the (111) axis the contribution to the NMR chemical shift is dominantly pseudo contact interaction. Separation of the contributions of the form and the pseudo contact interactions would correctly imply that the dipolar interaction is the dominant contribution to the NMR chemical shifts along the (100), (01), (001), and (110) axes, but along the (111) axis the form contact interaction is incorrectly the dominant contribution to the NMR chemical shift.

3d¹ 電子系에 對한 NMR 化學的 移動에 關한 硏究(Ⅰ)

盧承宇 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2

The NMR shift arising from the electron angular momentum and the electron spin dipolar-nuclear spin angular momentum interaction has been examined for 3d¹system in a strong octahedral crystal field when the threefold axis is chosen as the quantization axis. To investigate the NMR shift in this situation, first, we have extended the evalution on the hyperfine integrals to any paris of 3d orbitals adopting a general method which is applicable to a general vector R, pointing in arbitrary direction in space. Secondary, a general expression using a nonmultiple techniqus is drived for the NMR shift resulting from the electron angular momentum and the electron spin dipolar-nuclear spin angular momentum interastions. From this expression all the multipolar terms are determind. △B/B for the 3d¹system in this case is compared with that for the 3d¹system when the z axis is chosen as the quantization axis. When we choose the threefold axis as the quantization axis, it is found that along the<100>, <010> and <001> axes, △B/B values are significantly different from each other and along the <111>, <-1-1-1>,<-11-1>,<1-11>,<-1-11>,<11-1> <1-1-1> and <-111> axes, △B/B values are however the same. We also find that the 1/R7 term contributes dominantly to the NMR shift for all values of R. When 1/R5 term is included, there is good agreement between the exact solution and the multipolar terms when R≤0.35 nm.

3d^1 電子系에 對한 NMR 化學的移動에 關한 硏究(Ⅱ)

盧承宇 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-

The NMR shift arising from the electron angular momentum and the electron spin dipolar-nuclear spin angular momentum interaction has been investigated for 3d^1 system in a strong crystal field of trigonal symmetry when the threefold axis is chosen as the quantization axis. A general formular for the NMR shifts, which is derived adopting the axial wave functions, is used to compute the NMR shifts along the <100>, <010>, <001>, <110> and <111>axes. From the computed results. We find that the NMR shifts for a 3d^1 system in a strong crystal field of trigonal symmetry are not the same as those in a strong crystal field of tetragonal symmetry. In this work. We express the expansion coefficients a_1a^(i) and b_1^(i) of A^i and B^i in terms and matrices g_m^(i) and h_m^(i) and two matrices c_lm and d_lm of radial dependence. We also separate the NMR shift into the contributions of multipolar terms. We find than 1/R^3 term dominantly contributes to the NMR shift but the contributions other terms may not be negligible.

四角形[Pt(II)(PMe₃)₂X₂](X=Methyl,Cl)形態錯物에 대한 雙極自 모멘트의 計算에 關한 硏究

盧承宇 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2

EHT 計算에서 固有函數를 利用하여, 平面四角形 [Pt(II)(PMe₃)₂X₂](X=Methy1,CI)形態錯物의 雙極子 모멘트를 計算하였다. 計算된 cis-[Pt(II)(PMe₃)₂X₂]錯物의 雙極子 모멘트값이 cis-[Pt(II)(PMe₃)₂X₂]錯物의 雙極子 모멘트값의 2倍로 計算되었다. 이러한 結果는,cis-[Pt(II)(PMe₃)₂X₂]錯物에 對한 實驗的 測定値가 cis-[Pt(II)(PMe)CI]錯物에 對한 값보다 낮은 實驗的인 結果에 接近한다. 特히 cis-[Pt(II)(PMe₃)₂X₂]錯物에 대하여 計算한 雙極子 모멘트 값은 실험적 값에 매우 接近 하였다.

液狀이온交換樹指에 依한 Bi中 不純物의 微量定量

盧承宇 忠州大學校 1983 한국교통대학교 논문집 Vol.16 No.2

The extraction curve of metal ions with amberite LA1-chloroform ha been found to be more steeper than with amberite LA1-xylene or hexane, and extraction ratio of Zn (Ⅱ) in 2M-HCI solution is 97%. The extraction ratio of As(Ⅲ) in 10M∼12M-HC1 solution, Sb(Ⅲ) in 3∼5 M-HC1 solution and Fe(Ⅲ) in 8∼10M-HC1 solution are 100%. The saparated elements from Bimetal were determiened by colorimetry, Zn(Ⅱ) with xylenol orange, As(Ⅲ) with molybdenum blue Sb(Ⅲ) with rhodamine B and Fe(Ⅲ) with BPHA.