Pub Date : 2001-10-01DOI: 10.1080/10587250108024706
Haining Na, C. Kwon, W. Choi, Soo-Hyeon Park, K. Yoon, H. Baik, Yang-Kyoo Han
Abstract Three different titania-silica nanocomposite systems (8/2, 5/5, 2/8 molar ratio of TiO2/SiO2) were prepared by a modified hydrolysis-condensation reaction. The synthesized specimens had two structural phases; one is crystalline TiO2 in anatase form and the other is glass phase SiO2. The sizes of the nanocomposites ranged from 10 to 11 nm. All the resulting nanocomposites were found to be excellent as photocatalytic materials.
{"title":"Preparation of Sol-Gel Derived Nanocrystalline TiO2 Particles in Titania-Silica Composite for Photocatalytic Applications","authors":"Haining Na, C. Kwon, W. Choi, Soo-Hyeon Park, K. Yoon, H. Baik, Yang-Kyoo Han","doi":"10.1080/10587250108024706","DOIUrl":"https://doi.org/10.1080/10587250108024706","url":null,"abstract":"Abstract Three different titania-silica nanocomposite systems (8/2, 5/5, 2/8 molar ratio of TiO2/SiO2) were prepared by a modified hydrolysis-condensation reaction. The synthesized specimens had two structural phases; one is crystalline TiO2 in anatase form and the other is glass phase SiO2. The sizes of the nanocomposites ranged from 10 to 11 nm. All the resulting nanocomposites were found to be excellent as photocatalytic materials.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"22 1","pages":"135 - 138"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72782258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024715
Sung-Taek Lim, M. Kwon, D. Shin
Abstract The improved device performance of organic light emitting diodes(OLEDs) and hole-blocking effect of SiO layer are presented. The interface between the organic layer and metallic anode of an OLED is crucial to the stability and performance of the device. A uniform and thin film of the α-septithiophene(α-7T) has been used as a buffer layer at the interface between the ITO electrode and hole transport layer(HTL). The insertion of α-7T layer has decreased the operating voltage and improved the external power efficiency. The Maximum EL intensity was over 17000cd/m2 and the maximum external power efficiency at 2000cd/m2 is 6.41m/W and that at 100cd/m2 is 9.341m/W. Using the SiO layered in front of HTL as a hole-blocking layer, the sensitivity of the device efficiency on current density is investigated.
{"title":"Organic Light Emitting Diodes(OLEDs) with Oligothiophene and Silicon Monoxide","authors":"Sung-Taek Lim, M. Kwon, D. Shin","doi":"10.1080/10587250108024715","DOIUrl":"https://doi.org/10.1080/10587250108024715","url":null,"abstract":"Abstract The improved device performance of organic light emitting diodes(OLEDs) and hole-blocking effect of SiO layer are presented. The interface between the organic layer and metallic anode of an OLED is crucial to the stability and performance of the device. A uniform and thin film of the α-septithiophene(α-7T) has been used as a buffer layer at the interface between the ITO electrode and hole transport layer(HTL). The insertion of α-7T layer has decreased the operating voltage and improved the external power efficiency. The Maximum EL intensity was over 17000cd/m2 and the maximum external power efficiency at 2000cd/m2 is 6.41m/W and that at 100cd/m2 is 9.341m/W. Using the SiO layered in front of HTL as a hole-blocking layer, the sensitivity of the device efficiency on current density is investigated.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"17 1","pages":"171 - 176"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79265253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030039
Leah Jung, Y. K. Kim, B. C. Sohn, O. Kwon, M. Kwak, Ju Won Lee
Abstract We evaluated the various cleaning methods of ITO substrates such as aquaregia and RCA, using the organic electroluminescent devices with a structure of ITO/TPD/Alq3/LiAl. And the surface morphology of ITO substrates chemically treated in various ways was also investigated using Atomic Force Microscopy (AFM). It was found that in suitably treated device, both current injection and electroluminescent characteristics of the devices were significantly enhanced.
{"title":"Cleaning Effect of Indium-Tin-Oxide Substrates on The Electroluminescent Characteristics of Alq3","authors":"Leah Jung, Y. K. Kim, B. C. Sohn, O. Kwon, M. Kwak, Ju Won Lee","doi":"10.1080/10587250108030039","DOIUrl":"https://doi.org/10.1080/10587250108030039","url":null,"abstract":"Abstract We evaluated the various cleaning methods of ITO substrates such as aquaregia and RCA, using the organic electroluminescent devices with a structure of ITO/TPD/Alq3/LiAl. And the surface morphology of ITO substrates chemically treated in various ways was also investigated using Atomic Force Microscopy (AFM). It was found that in suitably treated device, both current injection and electroluminescent characteristics of the devices were significantly enhanced.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"96 1","pages":"61 - 64"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79789807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030050
Tetsuo Sato, N. Nagayama, M. Yokoyama
Abstract Modification of the refractive index of polysilanes due to the UV-photodecomposition and its application to phase mask were investigated. From the wavelength dependence of UV-photodecomposition in the poly[methyl(phenyl) silane] (PMPS) film, the refractive index was found to be effectively lowered by eliminating phenyl side-group with shorter wavelength UV light. It was also confirmed that the phase difference information could be recordable by utilizing such refractive index changes in PMPS films. Utilizing the 4-f matched-filter architecture based on the four-wave mixing with photorefractive polymers as the optical correlator, the occurrence of large correlation signal was successfully observed only when the image written in the PMPS phase mask was coincident with the phase difference pattern on the PMPS film as a reference. This result indicates that the polysilane films with UV-photodecomposition pattern can be useful for the phase difference mask in the optical correlation system.
{"title":"Optical Correlation System Based on Photorefractive Polymer and Polysilane Phase Mask","authors":"Tetsuo Sato, N. Nagayama, M. Yokoyama","doi":"10.1080/10587250108030050","DOIUrl":"https://doi.org/10.1080/10587250108030050","url":null,"abstract":"Abstract Modification of the refractive index of polysilanes due to the UV-photodecomposition and its application to phase mask were investigated. From the wavelength dependence of UV-photodecomposition in the poly[methyl(phenyl) silane] (PMPS) film, the refractive index was found to be effectively lowered by eliminating phenyl side-group with shorter wavelength UV light. It was also confirmed that the phase difference information could be recordable by utilizing such refractive index changes in PMPS films. Utilizing the 4-f matched-filter architecture based on the four-wave mixing with photorefractive polymers as the optical correlator, the occurrence of large correlation signal was successfully observed only when the image written in the PMPS phase mask was coincident with the phase difference pattern on the PMPS film as a reference. This result indicates that the polysilane films with UV-photodecomposition pattern can be useful for the phase difference mask in the optical correlation system.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"1 1","pages":"115 - 118"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84152137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024689
H. Hong, Wonchoul Park, Euykyung Yu
Abstract The electrochemical properties of gold electrodes modified with ω-mercaptoalkylhydroquinone SAMs (H2Q(CH2)nSH, n = 1, 4, 8, 12) were investigated by cyclic voltammetry. The electron transfer parameters and tunneling constant depending on the distance were evaluated.
摘要采用循环伏安法研究了ω-巯基烷基对苯二酚SAMs (H2Q(CH2)nSH, n = 1,4,8,12)修饰金电极的电化学性能。计算了电子转移参数和随距离变化的隧穿常数。
{"title":"Electrochemical Behavior of Self-assembled Monolayers(SAM) of ω-Mercaptoalkylhydroquinone on Gold","authors":"H. Hong, Wonchoul Park, Euykyung Yu","doi":"10.1080/10587250108024689","DOIUrl":"https://doi.org/10.1080/10587250108024689","url":null,"abstract":"Abstract The electrochemical properties of gold electrodes modified with ω-mercaptoalkylhydroquinone SAMs (H2Q(CH2)nSH, n = 1, 4, 8, 12) were investigated by cyclic voltammetry. The electron transfer parameters and tunneling constant depending on the distance were evaluated.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"58 1","pages":"67 - 70"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84167530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024686
Y. Kang, Sang-Do An
Abstract Derivatives of azobenzene cause photoisomerization when they are illuminated with UV-vis light. We investigated the photoisomerization of azobenzene derivatives for holographic memory. Organic films containing amphiphile azobenzene derivatives can be applied in molecular devices by changing energy of molecular level, refractive index. In order to investigate of photoisomerization of azobenzene derivatives at the air/water interface, azobenzene derivatives having side chain copolymer containing methacrylic acid [poly 4-(n-methacryloyl)-Disperse Red 1-methacrylic acid (pDRIMA)] was synthesized. The film of azobenzene derivative was characterized by the measurements of Brewster Angle Microscope (BAM) images at the air/water interface and Atomic Force Microscopy (AFM) images on the glass substrate.
{"title":"Brewster Angle Microscope and Atomic Force Microscopy Study of Poly 4-(n-Methacyloyl)-Disperse Red 1-Methacrylic Acid Monolayer at the Air/Water Interface and on the Glass Surface","authors":"Y. Kang, Sang-Do An","doi":"10.1080/10587250108024686","DOIUrl":"https://doi.org/10.1080/10587250108024686","url":null,"abstract":"Abstract Derivatives of azobenzene cause photoisomerization when they are illuminated with UV-vis light. We investigated the photoisomerization of azobenzene derivatives for holographic memory. Organic films containing amphiphile azobenzene derivatives can be applied in molecular devices by changing energy of molecular level, refractive index. In order to investigate of photoisomerization of azobenzene derivatives at the air/water interface, azobenzene derivatives having side chain copolymer containing methacrylic acid [poly 4-(n-methacryloyl)-Disperse Red 1-methacrylic acid (pDRIMA)] was synthesized. The film of azobenzene derivative was characterized by the measurements of Brewster Angle Microscope (BAM) images at the air/water interface and Atomic Force Microscopy (AFM) images on the glass substrate.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"23 1","pages":"53 - 56"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84387385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024704
S. Han, Young-sun Cho, Juyoung Kim, Gyoujin Cho, Seonghoon Lee, Jae-Suk Lee
Abstract The core-shell particles consisting of a nano-sized gold colloidal core and polypyrrole (Ppy) shell were simply prepared by using adsorbed cationic surfactants (cetyl pyrridinium chloride:CPC) arrays as template. The Ppy shell layers were effectively deposited under a condition where the CPC are adsorbed as bilayers on the surfaces of gold nanoparticles (Au). The Au-Ppy core-shell nanoparticles were found to be stable colloidal dispersion in aqueous media with 45 nm in diameter employed Ppy shell with 10 nm thickness.
{"title":"Preparation of Gold-Polypyrrole Core-shell Nanoparticles","authors":"S. Han, Young-sun Cho, Juyoung Kim, Gyoujin Cho, Seonghoon Lee, Jae-Suk Lee","doi":"10.1080/10587250108024704","DOIUrl":"https://doi.org/10.1080/10587250108024704","url":null,"abstract":"Abstract The core-shell particles consisting of a nano-sized gold colloidal core and polypyrrole (Ppy) shell were simply prepared by using adsorbed cationic surfactants (cetyl pyrridinium chloride:CPC) arrays as template. The Ppy shell layers were effectively deposited under a condition where the CPC are adsorbed as bilayers on the surfaces of gold nanoparticles (Au). The Au-Ppy core-shell nanoparticles were found to be stable colloidal dispersion in aqueous media with 45 nm in diameter employed Ppy shell with 10 nm thickness.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"140 1","pages":"127 - 130"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81711915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024738
D. Song, D. Shin, Sungjun Choi, Kil‐Yeong Choi, Mi-hieyi
Abstract Photosensitive polyimide containing chalcone moiety as a photoalignment layer in LCD is synthesized. Chalcone monomer is prepared through William's reaction and DOCDA-DAP is polymerized via one-step imidization followed by introducing the prepared chalcone moiety. The solution and film of the photosensitive polyimide are irradiated with UV light and characterized by UV-vis. and FT-IR spectroscopies.
{"title":"Study of the Photo-Alignment using Photo-Sensitive Polyimide (PI) Containing Chalcone Moiety","authors":"D. Song, D. Shin, Sungjun Choi, Kil‐Yeong Choi, Mi-hieyi","doi":"10.1080/10587250108024738","DOIUrl":"https://doi.org/10.1080/10587250108024738","url":null,"abstract":"Abstract Photosensitive polyimide containing chalcone moiety as a photoalignment layer in LCD is synthesized. Chalcone monomer is prepared through William's reaction and DOCDA-DAP is polymerized via one-step imidization followed by introducing the prepared chalcone moiety. The solution and film of the photosensitive polyimide are irradiated with UV light and characterized by UV-vis. and FT-IR spectroscopies.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"1 1","pages":"269 - 272"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81387481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024747
Hyeyoung Park, Namhyung Lee, J. Je, Kyungwook Min, Y. Huh, E. Kim, Haiwon Lee
Abstract We have synthesized 5-(diethylamino)-2-[(E)-2-(methoxy-1, 3-benzo thiazole)-1-diazenyl] phenol (DMBTA) azo and DMBTA complexed with Ni, Cu, and Zn for DVD-R fabrication. The structures of the products were characterized by 1H-NMR and FT-IR. The properties of the compounds required for DVD-R fabrication were elucidated by UV-VIS and TGA. From the UV-VIS data, Zn-DMBTA exhibited the best response with 635 nm generally used in a DVD player. Based on the analysis of TGA data, it showed high thermal stability. Accordingly, Zn-DMBTA is the best compound as a recording material for DVD-R fabrication.
{"title":"Synthesis and Characterization of X-azo Dyes (X˭Ni, Cu, Zn) for Digital Versatile Disc-Recordable (DVD-R)","authors":"Hyeyoung Park, Namhyung Lee, J. Je, Kyungwook Min, Y. Huh, E. Kim, Haiwon Lee","doi":"10.1080/10587250108024747","DOIUrl":"https://doi.org/10.1080/10587250108024747","url":null,"abstract":"Abstract We have synthesized 5-(diethylamino)-2-[(E)-2-(methoxy-1, 3-benzo thiazole)-1-diazenyl] phenol (DMBTA) azo and DMBTA complexed with Ni, Cu, and Zn for DVD-R fabrication. The structures of the products were characterized by 1H-NMR and FT-IR. The properties of the compounds required for DVD-R fabrication were elucidated by UV-VIS and TGA. From the UV-VIS data, Zn-DMBTA exhibited the best response with 635 nm generally used in a DVD player. Based on the analysis of TGA data, it showed high thermal stability. Accordingly, Zn-DMBTA is the best compound as a recording material for DVD-R fabrication.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"15 1","pages":"305 - 308"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82436584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024671
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
这是本刊编辑委员会原始页面的扫描图像。
{"title":"Editorial board page for “Molecular Crystals and Liquid Crystals”, Volume 371, Number 1","authors":"","doi":"10.1080/10587250108024671","DOIUrl":"https://doi.org/10.1080/10587250108024671","url":null,"abstract":"Abstract This is a scanned image of the original Editorial Board page(s) for this issue.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"36 1","pages":"a - a"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82997398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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