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Falak S, Shin B, Kang C, Khan ZA, Huh DS. Novel Capturer-Catalyst Microreactor System with a Polypyrrole/Metal Nanoparticle Composite Incorporated in the Porous Honeycomb-Patterned Film. ACS Appl Mater Interfaces 2023; 15:44456-44468. [PMID: 37635296 DOI: 10.1021/acsami.3c07667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
A composite of polypyrrole/metal nanoparticles (PPy/MNPs) was selectively incorporated into the pores of a honeycomb-patterned porous polycaprolactone polymer film to fabricate a novel capturer-catalyst microreactor system. This fabrication involved a modified breath figure method, where the polymer solution containing metal ions as an oxidizing agent was cast under humid conditions along with the pyrrole monomer through an interfacial reaction in a one-step in situ process. The higher hydrophilicity of the metal ions compared to the polymer solution led to their self-assembly around the pore surface, resulting in the selective incorporation of the PPy/MNP composite into the porous film. Copper (Cu), silver (Ag), and gold (Au) were used for the PPy/MNP fabrication. Various methods characterized the fabricated film. Strong catalytic degradations of methylene blue and methyl orange were obtained with PCL-PPy/MNPs. Recycling experiments showed no loss of activity even after five cycles of recycling. Comparative analysis of PCL-PPy, PCL-MNP, and PCL-PPy/MNP results indicated the synergistic action of PPy and MNPs in dye degradation. High-performance liquid chromatography and mass spectroscopy analyses confirmed dye degradation after treatment with a fabricated microreactor. PPy might have acted as a capturer of the dye molecule and MNPs as a catalyst, thereby enhancing the efficiency of dye degradation. Additionally, the PCL-PPy/Cu composite exhibited strong antimicrobial properties against Gram-positive (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) with no cytotoxicity as measured by the MTT assay. Therefore, the fabricated microreactor film has promising applications in various fields.
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Affiliation(s)
- Shahkar Falak
- Department of Nano Science and Engineering, Center of Nano Manufacturing, Inje University, Gimhae City 50834, Republic of Korea
| | - Bokyoung Shin
- Department of Nano Science and Engineering, Center of Nano Manufacturing, Inje University, Gimhae City 50834, Republic of Korea
| | - Chaewon Kang
- Department of Nano Science and Engineering, Center of Nano Manufacturing, Inje University, Gimhae City 50834, Republic of Korea
| | - Zeeshan Ahmad Khan
- Department of Nano Science and Engineering, Center of Nano Manufacturing, Inje University, Gimhae City 50834, Republic of Korea
| | - Do Sung Huh
- Department of Nano Science and Engineering, Center of Nano Manufacturing, Inje University, Gimhae City 50834, Republic of Korea
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Kulshrestha P, Kyoung Shin B, Falak S, Sung Huh D. Bio-inspired hierarchical structure of polyaniline on the surface of porous polymer film through interfacial polymerization as a smart material sensitive to pH. Eur Polym J 2023. [DOI: 10.1016/j.eurpolymj.2023.111893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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Falak S, Shin BK, Huh DS. Antibacterial Activity of Polyaniline Coated in the Patterned Film Depending on the Surface Morphology and Acidic Dopant. Nanomaterials (Basel) 2022; 12:1085. [PMID: 35407202 PMCID: PMC9000663 DOI: 10.3390/nano12071085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/21/2022] [Accepted: 03/23/2022] [Indexed: 12/13/2022]
Abstract
We have fabricated poly(ε-caprolactone) (PCL) films with flat and honeycomb-patterned (HCP) structures to coat polyaniline (PANI) on the film surface. In addition, the effect of chemical modification of PANI by sulfuric acid (H2SO4) was also studied for antibacterial activity. The flat and HCP PCL films were obtained by simple evaporation of the solvent and via the breath figure (BF) method, respectively. The morphology and chemical composition of PANI coated on the film surface were evaluated by scanning electron microscopy (SEM) and X-ray spectroscopy (EDX). Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analyses (TGA) were obtained to identify the PANI coating. The wettability and conductivity of the films were also measured. Applicational aspects were evaluated by assessing antibacterial and antibiofilm activity against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). The EDX, TGA, and FT-IR findings indicated chemical modification of PCL film by PANI and H2SO4. The conductivity of the films was increased by the coating of PANI to the patterned surface and additionally increased by the chemically modified PANI. The antibacterial activity was 69.79%, 78.27%, and 88% against E. coli, and 32.73%, 62.65%, and 87.97% against S. aureus, for flat PANI, HCP PANI, and H2SO4-treated HCP films, respectively. Likewise, the PANI coated flat, HCP, and H2SO4-treated HCP films inhibited E. coli biofilm formation by around 41.62%, 63%, and 83.88% and S. aureus biofilm formation by 17.81%, 69.83%, and 96.57%, respectively. The antibacterial activity of the HCP film was higher than that of flat PANI films, probably due to the higher coating of PANI on the HCP surface. Moreover, sulfonation of the HCP film with H2SO4 might have improved the wettability, thereby enhancing the antibacterial and antibiofilm properties. Our results showed that topographical changes, as well as doping, offer simple and cost-effective ways to modify the structural and functional properties of films.
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Affiliation(s)
| | | | - Do Sung Huh
- Department of Chemistry, Nano Science and Engineering, Center of Nano Manufacturing, Inje University, Gimhae-si 50834, Korea; (S.F.); (B.K.S.)
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Kettunen P, Huh DS, Szalai I, Yamaguchi T. Revival Oscillations in a Closed Bromate‐1,4‐Cyclohexanedione‐Acid System with Ferroin. Adv Theory Simul 2021. [DOI: 10.1002/adts.202100277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Petteri Kettunen
- Meiji Institute for Advanced Study of Mathematical Sciences (MIMS) Meiji University 4‐21‐1 Nakano, Nakano‐ku Tokyo 164‐8525 Japan
| | - Do Sung Huh
- Department of Chemistry and Nanoscience and Engineering Center of Nano Manufacturing Inje University Gimhae Campus, 197, Inje‐ro Gimhae‐si Gyeongsangnam‐do 50834 Republic of Korea
| | - István Szalai
- Institute of Chemistry Eötvös Loránd University P.O. Box 32 Budapest H‐1518 Hungary
| | - Tomohiko Yamaguchi
- Meiji Institute for Advanced Study of Mathematical Sciences (MIMS) Meiji University 4‐21‐1 Nakano, Nakano‐ku Tokyo 164‐8525 Japan
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Modigunta JKR, Kim JM, Cao TT, Yabu H, Huh DS. Pore-selective modification of the honeycomb-patterned porous polystyrene film with poly(N-isopropylacrylamide) and application for thermo-responsive smart material. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122630] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kim YW, Modigunta JKR, Male U, Huh DS. Effect of ferrocene on the fabrication of honeycomb-patterned porous polystyrene films and silver functionalization of the film. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.01.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Cao TT, Male U, Huh DS. Fabrication of pore-selective carboxyl group functionalized polyimide honeycomb-patterned porous films using KOH humidity. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.08.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Modigunta JKR, Male U, Huh DS. Formylated polystyrene for the fabrication of pore selective aldehyde group functionalized honeycomb patterned porous polystyrene films. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/polb.24641] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jeevan Kumar Reddy Modigunta
- Department of Chemistry and Nanoscience and Engineering; Center for Nanomanufacturing, Inje University; Gimhae Gyeongsangnam-do, 621749 South Korea
| | - Umashankar Male
- Department of Chemistry and Nanoscience and Engineering; Center for Nanomanufacturing, Inje University; Gimhae Gyeongsangnam-do, 621749 South Korea
| | - Do Sung Huh
- Department of Chemistry and Nanoscience and Engineering; Center for Nanomanufacturing, Inje University; Gimhae Gyeongsangnam-do, 621749 South Korea
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Uyen Thi PN, Male U, Huh DS. In situ surface selective functionalization of honeycomb patterned porous poly(ε-caprolactone) films using reactive substrate. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Uyen Thi PN, Male U, Huh DS. Fabrication of photo-responsive moth eye-like patterned poly(vinyl alcohol) films selectively containing TiO2 nanoparticles in the microdome. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.04.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Male U, Shin BK, Huh DS. Graphene oxide incorporated poly(ε-caprolactone) honeycomb-patterned porous polymer films by the breath figure method. Macromol Res 2017. [DOI: 10.1007/s13233-017-5044-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- Eun Jin Jo
- Department of Chemistry and Nanosystem Engineering, Center for Nano Manufacturing; Inje University; Kimhae 607 South Korea
| | - Umashankar Male
- Department of Chemistry and Nanosystem Engineering, Center for Nano Manufacturing; Inje University; Kimhae 607 South Korea
| | - Do Sung Huh
- Department of Chemistry and Nanosystem Engineering, Center for Nano Manufacturing; Inje University; Kimhae 607 South Korea
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Male U, Jo EJ, Park JY, Huh DS. Surface functionalization of honeycomb-patterned porous poly(ε-caprolactone) films by interfacial polymerization of aniline. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.07.040] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Basavaraja C, Jo EJ, Huh DS. Electron transport and photoelectrical behavior of poly(N-vinylcarbazole)/Poly(3,4-ethylenedioxythiophene) composite honeycomb-patterned films. Macromol Res 2016. [DOI: 10.1007/s13233-016-4026-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rathinaraj P, Al-Jumaily AM, Huh DS. Internalization: acute apoptosis of breast cancer cells using herceptin-immobilized gold nanoparticles. Breast Cancer (Dove Med Press) 2015; 7:51-8. [PMID: 25709498 PMCID: PMC4330001 DOI: 10.2147/bctt.s69834] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Herceptin, the monoclonal antibody, was successfully immobilized on gold nanoparticles (GNPs) to improve their precise interactions with breast cancer cells (SK-BR3). The mean size of the GNPs (29 nm), as determined by dynamic light scattering, enlarged to 82 nm after herceptin immobilization. The in vitro cell culture experiment indicated that human skin cells (FB) proliferated well in the presence of herceptin-conjugated GNP (GNP–Her), while most of the breast cancer cells (SK-BR3) had died. To elucidate the mechanism of cell death, the interaction of breast cancer cells with GNP–Her was tracked by confocal laser scanning microscopy. Consequently, GNP–Her was found to be bound precisely to the membrane of the breast cancer cell, which became almost saturated after 6 hours incubation. This shows that the progression signal of SK-BR3 cells is retarded completely by the precise binding of antibody to the human epidermal growth factor receptor 2 receptor of the breast cancer cell membrane, causing cell death.
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Affiliation(s)
- Pierson Rathinaraj
- Institute of Biomedical Technologies, Auckland University of Technology, Auckland, New Zealand
| | - Ahmed M Al-Jumaily
- Institute of Biomedical Technologies, Auckland University of Technology, Auckland, New Zealand
| | - Do Sung Huh
- Department of Nano science and Engineering, Inje University, Gimhea, South Korea
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Thinh PX, Kim JK, Huh DS. Fabrication of honeycomb-patterned polyaniline composite films using chemically modified polyaniline nanoparticles. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.08.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kim JK, Jung KH, Jang JH, Huh DS. Hydrophobic interaction-mediated reversible adsorption–desorption of nanoparticles in the honeycomb-patterned thermoresponsive poly(N-isopropylamide) hydrogel surface. Polym Bull (Berl) 2014. [DOI: 10.1007/s00289-014-1129-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Jang JH, Orbán M, Wang S, Huh DS. Adsorption–desorption oscillations of nanoparticles on a honeycomb-patterned pH-responsive hydrogel surface in a closed reaction system. Phys Chem Chem Phys 2014; 16:25296-305. [DOI: 10.1039/c4cp03083d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Adsorption–desorption oscillations of nanoparticles on a honeycomb-patterned pH-responsive hydrogel surface were derived from a pH-oscillator in a closed reaction system.
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Affiliation(s)
- Ji Ho Jang
- Department of Chemistry and Nanoscience and Engineering
- Institute of Basic Science
- Inje University
- Gimhae City, South Korea
| | - M. Orbán
- Department of Analytical Chemistry
- L. Eötvös University
- , Hungary
| | - Shutao Wang
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- 100190 Beijing, P. R. China
| | - Do Sung Huh
- Department of Chemistry and Nanoscience and Engineering
- Institute of Basic Science
- Inje University
- Gimhae City, South Korea
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Jung GH, Kim JK, Thinh PX, Huh DS. Photo-controlled fabrication of honeycomb-patterned films in poly(N-vinylcarbazole/azobenzene) copolymer. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2013.08.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Kim KI, Basavaraja C, Huh DS. Homogeneously Dispersed Silver Nanoparticles on the Honeycomb-Patterned Poly(N-vinylcarbazole)-cellulose triacetate Composite Thin Films by the Photoreduction of Silver Nitrate. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.5.1391] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kim JK, Kim KI, Basavaraja C, Rabai G, Huh DS. Reversible Adsorption–Desorption Oscillations of Nanoparticles on a Patterned Hydrogel Surface Induced by a pH Oscillator in a Closed Chemical System. J Phys Chem B 2013; 117:6294-303. [DOI: 10.1021/jp401100z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jin Kyung Kim
- Department of Chemistry, Inje University, Obang 607, Gimhae City,
South Korea
| | - Kwang Il Kim
- Department of Chemistry, Inje University, Obang 607, Gimhae City,
South Korea
| | - C. Basavaraja
- Department of Chemistry, Inje University, Obang 607, Gimhae City,
South Korea
| | - G. Rabai
- Institute of
Physical Chemistry, University of Debrecen, P.O. Box 7.H-4010 Debrecen,
Hungary
| | - Do Sung Huh
- Department of Chemistry, Inje University, Obang 607, Gimhae City,
South Korea
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Xuan Thinh P, Basavaraja C, Il Kim K, Huh DS. Fabrication and characterization of honeycomb-patterned film from poly(ɛ-caprolactone)/poly((R)-3-hydroxybutyric acid)/reduced graphene oxide composite. Polym J 2013. [DOI: 10.1038/pj.2013.34] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Basavaraja C, Thinh PX, Huh DS. Characterization and electrical behavior of biodegradable poly(N-vinylcarbazole)/poly(3-hydroxybutyric acid) composite films. Macromol Res 2013. [DOI: 10.1007/s13233-013-1061-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Thinh PX, Basavaraja C, Kim DG, Huh DS. Characterization and electrochemical behaviors of honeycomb-patterned poly(N-vinylcarbazole)/polystyrene composite films. Polym Bull (Berl) 2012. [DOI: 10.1007/s00289-012-0727-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kim DG, Basavaraja C, Yamaguchi T, Huh DS. Photo-controlled fabrication of self-organized structures in honeycomb-patterned thin films with light-sensitive amphiphilic copolymer. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.01.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Huh DS, Choe SJ. Comparative DFT study for molecular geometries and spectra of methyl pheophorbides-a: test of M06-2X and two other functionals. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424610002410] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The recent interest in the application of density functional theory (DFT) has prompted us to test several functions in molecular geometries of methyl pheophorbides-a (MPa), an important starting material in photodynamic therapy (PDT). In this study, we report on tests for three popular DFT methods: M06-2X, B3LYP, and LSDA. Based on the standard deviation and the mean value, and by using the difference between optimized calculated value and experimental value in geometries, we drew the following conclusions: M06-2X/6-311+G(d,p) attained the smallest standard deviation of difference among the tested DFT methods in terms of bond length, whereas the standard deviation of bond angle in LSDA/6-311+G(d,p) was the smallest. In terms of absolute value, the mean value of LSDA/6-311+G(d,p) calculation was larger than that of M06-2X/6-311+G(d,p). We found that M06-2X/6-311+G(d,p) gave the best performance for MPa in the molecular geometries. The UV-visible spectrum was calculated with time-dependent density-functional theory (TD-DFT). Time-dependent M06-2X/6-311+G(d,p) gave the best performance for MPa in CH2Cl2 solution. In general, TD-DFT calculations in CH2Cl2 solution were more red-shifted compared with those in the solid state.
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Affiliation(s)
- Do Sung Huh
- Department of Chemistry, Institute of Basic Science, Inje University, Kimhae 621-749, Korea
| | - Sang Joon Choe
- Department of Chemistry, Institute of Basic Science, Inje University, Kimhae 621-749, Korea
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Basavaraja C, Kim BS, Huh DS. Characterization and AC electrical conductivity for the dispersed composites containing alginate-multiwalled carbon nanotubes. Macromol Res 2011. [DOI: 10.1007/s13233-011-0314-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Raghunandan D, Borgaonkar PA, Bendegumble B, Bedre MD, Bhagawanraju M, Yalagatti MS, Huh DS, Abbaraju V. Microwave-Assisted Rapid Extracellular Biosynthesis of Silver Nanoparticles Using Carom Seed (Trachyspermum copticum) Extract and in Vitro Studies. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/ajac.2011.24057] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kim BS, Basavaraja C, Jo EA, Kim DG, Huh DS. Effect of amphiphilic copolymer containing ruthenium tris(bipyridyl) photosensitizer on the formation of honeycomb-patterned film. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.05.050] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Basavaraja C, Jo EA, Kim BS, Huh DS. Morphology and photoconductivity of poly-N-vinylcarbazole-cellulose triacetate Langmuir–Schaefer films. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.04.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Swaruparani H, Basavaraja S, Basavaraja C, Huh DS, Venkataraman A. A new approach to soluble polyaniline and its copolymers with toluidines. J Appl Polym Sci 2010. [DOI: 10.1002/app.31745] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Basavaraja C, Pierson R, Huh DS, Venkataraman A, Basavaraja S. Studies on properties of polyaniline-dodecylbenzene sulfonic acid composite films synthesized using different oxidants. Macromol Res 2009. [DOI: 10.1007/bf03218917] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Basavaraja C, Veeranagouda Y, Lee K, Pierson R, Huh DS. Surface characterization and electrical behavior of polyaniline-polymannuronate nanocomposites. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21611] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Basavaraja C, Pierson R, Huh DS. Synthesis, characterization, and comparative study of conducting polyaniline/lead titanate and polyaniline–dodecylbenzenesulfonic acid/lead titanate composites. J Appl Polym Sci 2008. [DOI: 10.1002/app.27582] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Huh DS, Park SH, Kim YJ, Park DY, Zhao YS, Ahn SH, Yoshida R, Yamaguchi T. Dependence of Turbidity Oscillations of Self-Oscillating Polymers on the Selective Recognition of the Crown Ether Receptors Contained in the Polymer Chain. J Phys Chem B 2006; 110:13405-9. [PMID: 16821862 DOI: 10.1021/jp0609129] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The turbidity oscillations of self-oscillating polymers in the Belousov-Zhabotinsky (BZ) reaction system depending on the crown ether receptors contained in the polymer network have been studied. The three monomers are copolymerized, namely, N-isopropylacrylamide, the metal catalyst monomer for the BZ reaction, and the crown ether receptor monomer, to prepare the self-oscillating polymers used in this study. The turbidity oscillations are characterized by monitoring the transmittance of the polymer solution in the BZ reaction system at a specific wavelength of 570 nm. The oscillations are varied by crown ether receptors used in the polymerization process, i.e., BCAm(6) or BCAm(5), for the selective recognition of specific cations between potassium and sodium ions in the solution. The selective recognition of the BCAm receptors in the polymer chain for the two ions has brought out a variation in the turbidity oscillations by a change in the hydrophilicity of the polymer chain. The oscillations of the polymer solution composed of the BCAm(5) receptor are more influenced by sodium ion, while the polymer solution of BCAm(6) receptor is affected by potassium ion. However, the oscillation patterns of the redox changes obtained by these solution systems look much alike despite the differences in the polymer chain by crown ether receptors and cations of bromate used for the BZ reaction.
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Affiliation(s)
- Do Sung Huh
- Department of Chemistry, Inje University, Kimhae, Kyungnam 621-749, South Korea.
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Huh DS, Choe YM, Park DY, Park SH, Zhao YS, Kim YJ, Yamaguchi T. Controlling the Ru-catalyzed Belousov–Zhabotinsky reaction by addition of hydroquinone. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2005.10.083] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Huh DS, Kang JK, Kim YJ, Yoshida R. Control of wave formation pattern in self-oscillating gel by addition of hydroquinone in the Belosov-Zhabotinsky reaction solution. Polym Bull (Berl) 2005. [DOI: 10.1007/s00289-005-0373-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wang J, Yadav K, Zhao B, Gao Q, Huh DS. Photocontrolled oscillatory dynamics in the bromate-1,4-cyclohexanedione reaction. J Chem Phys 2004. [DOI: 10.1063/1.1809111] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Huh DS, Kim YJ, Kim HS, Kang JK, Wang J. The influence of visible light on the formation of revival waves in the 1,4-cyclohexanedione–bromate–ferroin reaction. Phys Chem Chem Phys 2003. [DOI: 10.1039/b304807a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Huh DS, Kim HS. Bistability of propagating front with spin-mode in a frontal polymerization of trimethylopropane triacrylate. POLYM INT 2003. [DOI: 10.1002/pi.1269] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
The benefits of radio-chemotherapy in HIV-negative primary central nervous system (CNS) lymphomas were analyzed in 40 patients, who received radiotherapy to the brain or craniospinal axis with the total dose of 4460-5940 cGy to the primary tumor. Radiotherapy was followed by systemic chemotherapy, mainly with the cyclophosphamide, doxorubicin, vincristine and prednisolone (CHOP) regimen, in 16 of the patients. Follow-up ranged from four to 95 months with a median of 15 months. The relapse rate was 72.5%, and 83% of the relapses occurred within the radiation field. Median survival was 19 months and the two-year survival rate was 41%. Survival was significantly influenced by treatment method and radiation dose when measured by univariate analysis; median survival and the two-year survival rate was 29 months and 63% after radio-chemotherapy, while 13.5 month and 29% after radiotherapy alone (p= 0.027), and 22 months and 49% with doses of 50 Gy or more, but 12.5 months and 13% with doses less than 50 Gy (p=0.009). However, statistical significance was lost in multivariate analysis. These results might suggest the short-term efficacy of radio-chemotherapy, however, cautious observation is needed to confirm long-term effects.
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Affiliation(s)
- H G Wu
- Department of Therapeutic Radiology, Seoul National University College of Medicine, Korea
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