Pub Date : 2001-10-01DOI: 10.1080/10587250108024758
S. Hayashi, T. Abe, N. Higashi, M. Niwa, K. Kurihara
Abstract Brush layers of polyelectrolytes, ionized poly(L-lysine) (PLL) or poly(L-glutamic acid) (PLGA), at desired densities were prepared by the Langmuir-Blodgett (LB) deposition of amphiphiles bearing PLL or PLGA segments as hydrophilic groups, and subjected to the surface force measurements. Abrupt changes in the surface force, the surface potential, and the transfer ratio of the brush layers were observed at a critical density. The present data is in good agreement with our previous report on the jump in the compressibility of the brushes, and supports the existence of the density dependent transition of polyelectrolytes in solutions.
{"title":"Transition Behavior of Polyelectrolyte Brushes Depending on Polymer Chain Density","authors":"S. Hayashi, T. Abe, N. Higashi, M. Niwa, K. Kurihara","doi":"10.1080/10587250108024758","DOIUrl":"https://doi.org/10.1080/10587250108024758","url":null,"abstract":"Abstract Brush layers of polyelectrolytes, ionized poly(L-lysine) (PLL) or poly(L-glutamic acid) (PLGA), at desired densities were prepared by the Langmuir-Blodgett (LB) deposition of amphiphiles bearing PLL or PLGA segments as hydrophilic groups, and subjected to the surface force measurements. Abrupt changes in the surface force, the surface potential, and the transfer ratio of the brush layers were observed at a critical density. The present data is in good agreement with our previous report on the jump in the compressibility of the brushes, and supports the existence of the density dependent transition of polyelectrolytes in solutions.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"57 1","pages":"349 - 354"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88301776","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: 10.1080/10587250108030046
T. Nagamura, Tatsuo Adachi, Iori Yoshida, H. Inoue, H. Heckmann, M. Hanack
Abstract Ultrafast all-optical reflection control was achieved by complex refractive index changes upon photoexcitation of indium phthalocyanine in a guided mode geometry device. It gave a few microseconds response mostly characteristic to the lifetime of the excited triplet state.
{"title":"Ultrafast Reflection Control based on Photoinduced Complex Refractive Index Changes in Guided Mode Thin Films Containing Indium Phthalocyanine","authors":"T. Nagamura, Tatsuo Adachi, Iori Yoshida, H. Inoue, H. Heckmann, M. Hanack","doi":"10.1080/10587250108030046","DOIUrl":"https://doi.org/10.1080/10587250108030046","url":null,"abstract":"Abstract Ultrafast all-optical reflection control was achieved by complex refractive index changes upon photoexcitation of indium phthalocyanine in a guided mode geometry device. It gave a few microseconds response mostly characteristic to the lifetime of the excited triplet state.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"1 1","pages":"102 - 97"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89387484","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: 10.1080/10587250108024772
Sook Jung, Eugene Kim, S. Oh, C. Lee
Abstract Organic EL device with a dye-doped polymeric hole transporting layer, i.e. a device consisting of ITO / dye doped Poly[N-(p-3-diphenylamine)phenylmethacrylamide](PDPMA) / Alq3, was fabricated and investigated. Using three different fluorescent dyes (Nile red, DCM, and TPP) at various compositions as guest emitting materials, the relations among the spectral overlap, emission characteristics, the physical, chemical and morphological properties were studied.
{"title":"Luminescent and Morphological Properties of Color Tuning Device Composed of Alq3 and PDPMA doped by Fluorescent Dye","authors":"Sook Jung, Eugene Kim, S. Oh, C. Lee","doi":"10.1080/10587250108024772","DOIUrl":"https://doi.org/10.1080/10587250108024772","url":null,"abstract":"Abstract Organic EL device with a dye-doped polymeric hole transporting layer, i.e. a device consisting of ITO / dye doped Poly[N-(p-3-diphenylamine)phenylmethacrylamide](PDPMA) / Alq3, was fabricated and investigated. Using three different fluorescent dyes (Nile red, DCM, and TPP) at various compositions as guest emitting materials, the relations among the spectral overlap, emission characteristics, the physical, chemical and morphological properties were studied.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"74 1","pages":"415 - 418"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85955065","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: 10.1080/10587250108030080
Y. Ueda, T. Murakami, Sato Masaki, Jin Chen, J. Ni, Y. Yoshida, N. Tanigaki, K. Yase, Daike K Wang
Abstract Oligomeric dimethylsilane (ODMS) and 1,6-di-(p-methoxy-strtyl)benzene (DSB-1) grew epitaxially on the friction-transferred polydimethylsilane (PDMS) and poly(p-phenylenevinylene) (PPV) layers. The ODMS/PDMS and DSB-1/PPV double layers indicated the remarkable anisotropic feature in absorption and emission properties.
{"title":"Fabrication, Characterization and Optical Properties of Epitaxially Grown Oligomer/polymer Double Layers","authors":"Y. Ueda, T. Murakami, Sato Masaki, Jin Chen, J. Ni, Y. Yoshida, N. Tanigaki, K. Yase, Daike K Wang","doi":"10.1080/10587250108030080","DOIUrl":"https://doi.org/10.1080/10587250108030080","url":null,"abstract":"Abstract Oligomeric dimethylsilane (ODMS) and 1,6-di-(p-methoxy-strtyl)benzene (DSB-1) grew epitaxially on the friction-transferred polydimethylsilane (PDMS) and poly(p-phenylenevinylene) (PPV) layers. The ODMS/PDMS and DSB-1/PPV double layers indicated the remarkable anisotropic feature in absorption and emission properties.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"2016 1","pages":"245 - 248"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87869093","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: 10.1080/10587250108024712
S. Kuroda, K. Marumoto, Hideki Ito, N. Greenham, R. Friend, Y. Shimoi, S. Abe
Abstract Light-induced ESR (LESR) has been employed to study optically-generated polarons in two dialkoxy derivatives of poly(p-phenylene vinylene) (PPV), MEH-PPV and CN-PPV. A clear reduction of LESR linewidth is observed in CN-PPV compared with MEH-PPV and also with PPV previously reported, providing direct evidence that the polaron spin density predominantly reside on vinyl sites. This feature can be reproduced by the linewidth analysis based on a theoretical spin distribution of a polaron extending over approximately 4 phenyl rings.
{"title":"ESR Observation of Optically-Generated Polarons in Conjugated Electroluminescent Polymers","authors":"S. Kuroda, K. Marumoto, Hideki Ito, N. Greenham, R. Friend, Y. Shimoi, S. Abe","doi":"10.1080/10587250108024712","DOIUrl":"https://doi.org/10.1080/10587250108024712","url":null,"abstract":"Abstract Light-induced ESR (LESR) has been employed to study optically-generated polarons in two dialkoxy derivatives of poly(p-phenylene vinylene) (PPV), MEH-PPV and CN-PPV. A clear reduction of LESR linewidth is observed in CN-PPV compared with MEH-PPV and also with PPV previously reported, providing direct evidence that the polaron spin density predominantly reside on vinyl sites. This feature can be reproduced by the linewidth analysis based on a theoretical spin distribution of a polaron extending over approximately 4 phenyl rings.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"18 1","pages":"159 - 162"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76475711","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: 10.1080/10587250108024697
Xiaoyuan Li, Gang Yao
Abstract Monolayer of uniform gold (Au) and platinum (Pt) nanoparticles were prepared from photochemical and sonochemical conversion of layer-by-layer assembled {R+|AuCl4 −}n, {R+|PtCl4 2-}n and {R+|PtCl6 2-}n films, respectively, where R+ is a cationic surfactant or a cationic polymer.
{"title":"Layer-by-layer Assembled Molecular Films—II: Monolayers of Metal Nanoclusters from Photochemical and Sonochemical Conversion of Multilayered Ionic Films","authors":"Xiaoyuan Li, Gang Yao","doi":"10.1080/10587250108024697","DOIUrl":"https://doi.org/10.1080/10587250108024697","url":null,"abstract":"Abstract Monolayer of uniform gold (Au) and platinum (Pt) nanoparticles were prepared from photochemical and sonochemical conversion of layer-by-layer assembled {R+|AuCl4 −}n, {R+|PtCl4 2-}n and {R+|PtCl6 2-}n films, respectively, where R+ is a cationic surfactant or a cationic polymer.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"284 1","pages":"102 - 99"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73400297","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: 10.1080/10587250108024748
L. Park, Y. Han, Sang Dae Kim, J. Hwang
Abstract Aromatic dialdehyde based on phenothiazine and aromatic diamine were used to synthesize polyazomethine type conjugated polymer, poly(PZ-PI) which had good solubility in common organic solvents. The UV absorption maximum(λmax,UV) and edge(λedg,UV) of poly(PZ-PI) were observed at 415 and 510 nm, respectively. The threshold voltage of ITO/polymer/Mg and ITO/polymer/Alq3(100 Å)/Mg device was at 10 V and 7 V, respectively. Besides double layer LED with Alq3 exhibited both enhanced emission intensity and efficiency compared to the single layer LED.
{"title":"Synthesis of Polyazomethine Type Conjugated Polymers as Light Emitting Materials","authors":"L. Park, Y. Han, Sang Dae Kim, J. Hwang","doi":"10.1080/10587250108024748","DOIUrl":"https://doi.org/10.1080/10587250108024748","url":null,"abstract":"Abstract Aromatic dialdehyde based on phenothiazine and aromatic diamine were used to synthesize polyazomethine type conjugated polymer, poly(PZ-PI) which had good solubility in common organic solvents. The UV absorption maximum(λmax,UV) and edge(λedg,UV) of poly(PZ-PI) were observed at 415 and 510 nm, respectively. The threshold voltage of ITO/polymer/Mg and ITO/polymer/Alq3(100 Å)/Mg device was at 10 V and 7 V, respectively. Besides double layer LED with Alq3 exhibited both enhanced emission intensity and efficiency compared to the single layer LED.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"5 1","pages":"309 - 312"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79723776","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: 10.1080/10587250108030058
G. Lee, Sang Woo Kim, Jungho Ma, T. Lim, Bong-keun So, Soo-Min Lee, Tae‐Dong Kim, K. Lee
Abstract The temperature dependence of second harmonic generation efficiency have been studied to investigate the poling and relaxation dynamics of polyamic acid carrying two end-on attached chromophores of DR1 and DANS. We interpreted the experimental results with the free volume model and thermal orientation fluctuation of structural components such as the nonlinear optical chromophores and main chains.
{"title":"Poling and Relaxation Dynamics of a Nonlinear Optical Polyimide: Temperature-Dependent SHG Study","authors":"G. Lee, Sang Woo Kim, Jungho Ma, T. Lim, Bong-keun So, Soo-Min Lee, Tae‐Dong Kim, K. Lee","doi":"10.1080/10587250108030058","DOIUrl":"https://doi.org/10.1080/10587250108030058","url":null,"abstract":"Abstract The temperature dependence of second harmonic generation efficiency have been studied to investigate the poling and relaxation dynamics of polyamic acid carrying two end-on attached chromophores of DR1 and DANS. We interpreted the experimental results with the free volume model and thermal orientation fluctuation of structural components such as the nonlinear optical chromophores and main chains.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"70 5 1","pages":"147 - 150"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79617941","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: 10.1080/10587250108030031
M. Noto, H. Matsufuji, Y. Hori, M. Era
Abstract New arylethylbenzene derivatives were prepared as emissive material for organic electroluminescent (EL) device. In the EL device using an arylethynylbenzene with naphthyl group, intense blue emission was successfully observed; emission was peaking at 450 nm, and maximum luminance was 788 cdm−2 at a current density of 3.05 Acm−2
{"title":"Blue EL Devices with Arylethynylbenzene Derivatives as Emissive Materials","authors":"M. Noto, H. Matsufuji, Y. Hori, M. Era","doi":"10.1080/10587250108030031","DOIUrl":"https://doi.org/10.1080/10587250108030031","url":null,"abstract":"Abstract New arylethylbenzene derivatives were prepared as emissive material for organic electroluminescent (EL) device. In the EL device using an arylethynylbenzene with naphthyl group, intense blue emission was successfully observed; emission was peaking at 450 nm, and maximum luminance was 788 cdm−2 at a current density of 3.05 Acm−2","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"69 1","pages":"27 - 30"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75649490","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: 10.1080/10587250108024682
Won‐Ki Lee, H. Nakahara, Hyuntaek Lim, W. Cho, C. Ha
Abstract Intermolecular interaction between PEG monostearate with two ethylene glycol units (N=2) and several polymer monolayers at air/water interface was investigated. For polymer monolayers, poly(methyl methacrylate) (PMMA) and poly(isopropenyl acetate) (PIPA) were spread on the distilled water. It was observed that the positive or negative deviation behavior between the mean surface area and the composition of the mixed monolayers in the condensed state is in good agreement with the miscibility behavior of the blends of the component polymers in the bulk state.
{"title":"Intermolecular Interaction between Polymer Monolayers and Poly(ethylene glycol) Monostearates at Air/Water Interface","authors":"Won‐Ki Lee, H. Nakahara, Hyuntaek Lim, W. Cho, C. Ha","doi":"10.1080/10587250108024682","DOIUrl":"https://doi.org/10.1080/10587250108024682","url":null,"abstract":"Abstract Intermolecular interaction between PEG monostearate with two ethylene glycol units (N=2) and several polymer monolayers at air/water interface was investigated. For polymer monolayers, poly(methyl methacrylate) (PMMA) and poly(isopropenyl acetate) (PIPA) were spread on the distilled water. It was observed that the positive or negative deviation behavior between the mean surface area and the composition of the mixed monolayers in the condensed state is in good agreement with the miscibility behavior of the blends of the component polymers in the bulk state.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"191 1","pages":"37 - 40"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75686279","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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