The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform

Jo Shu Chang - One of the best experts on this subject based on the ideXlab platform.

  • phototrophic hydrogen production in photobioreactors coupled with solar energy excited optical fibers
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Chun Yen Chen, Chimei Lee, Ganesh Dattatraya Saratale, Pei Chung Chen, Jo Shu Chang
    Abstract:

    Abstract A novel solar-energy-excited optical fiber (SEEOF) photobioreactor (PBR) was developed to enhance the phototrophic H 2 production by Rhodopseudomonas palustris WP3-5 using acetate (HAc) as the sole carbon source. The PBR was illuminated by combinative light sources, including an internal illumination with optical fiber excited by solar energy (OF(sunlight)) as well as external irradiation of tungsten Filament Lamp (TL). The photo-H 2 producing performance of the SEEOF photobioreactor was further improved by using an innovative light dependent resistor (LDR) system, which could maintain sufficient and continual light supply. The results show that combination of OF(sunlight)/TL was more effective than the TL/TL illumination system, leading to a 138% and 136% increase in cumulative H 2 production ( V H 2 ) and H 2 yield ( Y H 2 ) , respectively. The LDR-coupled SEEOF photobioreactor was able to solve the problems of diurnal variation in solar light intensity, enabling the control of a constant total light irradiation intensity on the PBR surface. Combining OF(sunlight)/TL with LDR, the V H 2 and Y H 2 were nearly 27% higher than without LDR. For bioreactor scale up from 50 to 1800 ml working volume, the LDR-coupled SEEOF photobioreactor worked well during daytime, leading to a marked improvement in phototrophic H 2 production with a V H 2 and Y H 2 of 3606 ml and 2.45 mol H 2 /mol HAc, respectively. Moreover, continuous cultures operated at a hydraulic retention time (HRT) of 48 h show a high hydrogen production rate of 32.4 ml/l/h with stable operation for over 15 days. This optimal performance of LDR-coupled SEEOF photobioreactor is superior to most reported results and is a favorable choice of electricity-saving PBR strategy to improve photo-H 2 production efficiency.

  • feasibility study on bioreactor strategies for enhanced photohydrogen production from rhodopseudomonas palustris wp3 5 using optical fiber assisted illumination systems
    International Journal of Hydrogen Energy, 2006
    Co-Authors: Chun Yen Chen, Chimei Lee, Jo Shu Chang
    Abstract:

    Abstract A novel photobioreactor (PBR) was utilized to produce H2 by indigenous purple nonsulfur bacterium Rhodopseudomonas palustris WP3-5 using acetate as the sole carbon source. The PBR was illuminated by combinative light sources including side-light optical fibers (internal light source) as well as external irradiation of halogen Lamp and/or tungsten Filament Lamp. A fill and draw (F/D) operation of PBR was shown to improve the performance of photoH2 production over the performance of batch and continuous cultures under similar operation conditions. For medium improvement, the PBR was conducted under different concentrations of carbon source (acetate) and nitrogen source (glutamic acid). The results show that the highest overall H2 production rate ( v H 2 ) and H2 yield ( Y H 2 ) occurred when the acetate concentration was 32.5 mmol/l and the glutamic acid concentration was 400 mg/l. The optimal acetate and glutamic acid concentration led to a v H 2 and Y H 2 of 20.9 ml/h l and 2.47 mol H2/mol acetate, respectively. The H2 production rate and yield was further enhanced to as high as 38.2 ml/h l and 3.15 mol H2/mol acetate, respectively, while using a ternary-light-source (TLS) system, combining optical fiber, halogen Lamp, and tungsten Filament Lamp (i.e., the OF/HL/TL system). Meanwhile, the high H2 production efficiency with TLS system was stably maintained for nearly 30 day under the F/D operations.

  • hydrogen production by indigenous photosynthetic bacterium rhodopseudomonas palustris wp3 5 using optical fiber illuminating photobioreactors
    Biochemical Engineering Journal, 2006
    Co-Authors: Chun Yen Chen, Chimei Lee, Jo Shu Chang
    Abstract:

    Abstract A novel optical fiber-based photobioreactor was utilized to produce H 2 by indigenous purple nonsulfur bacterium Rhodopseudomonas palustris WP3–5 using acetate as the sole carbon source. Plastic cladding of conventional end-light optical fibers was removed to obtain side-light optical fibers (SLOF), which was inserted into photobioreactors as the internal light source. External irradiation by conventional Lamps may also be provided for the bioreactor as supplemental light sources. The H 2 production performance and light conversion efficiency of the photobioreactor were assessed when various illumination systems were used. The light sources examined included SLOF excited by halogen Lamp (OF-HL), SLOF excited by metal–halide Lamp (OF-MH), tungsten Filament Lamp (TL), halogen Lamp (HL), and binary combinations of the above. Compared with bioreactors illuminated by external Lamps, the OF-HL system produced more H 2 (625 ml), had higher light conversion efficiency (1.80%), and achieved higher H 2 yield (1.19 mol H 2 /mol acetic acid). However, among the single light sources examined, HL gave the highest overall ( ν H 2 ) and specific ( ν s, H 2 ) H 2 production rate of 8.68 ml/l h and 3.01 ml/h g cell, respectively, primarily due to enabling better cell growth. Using OF-MH system resulted in poor H 2 production, indicating that emission spectrum of light sources was critical to photo-H 2 production. Combination of two different light sources appeared to further enhance photo-H 2 production, especially when optical fibers and external Lamps were combined. Combination of OF-HL and TL exhibited the highest H 2 yield, ν H 2 , and ν s, H 2 of 2.64 mol H 2 /mol acetic acid, 17.06 ml/h l, and 9.47 ml/h g cell, respectively. However, the highest total H 2 production (944 ml) and light conversion efficiency (1.42%) were attained when two types of optical fibers were incorporated (i.e., the OF-HL/OF-MH system).

Chun Yen Chen - One of the best experts on this subject based on the ideXlab platform.

  • phototrophic hydrogen production in photobioreactors coupled with solar energy excited optical fibers
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Chun Yen Chen, Chimei Lee, Ganesh Dattatraya Saratale, Pei Chung Chen, Jo Shu Chang
    Abstract:

    Abstract A novel solar-energy-excited optical fiber (SEEOF) photobioreactor (PBR) was developed to enhance the phototrophic H 2 production by Rhodopseudomonas palustris WP3-5 using acetate (HAc) as the sole carbon source. The PBR was illuminated by combinative light sources, including an internal illumination with optical fiber excited by solar energy (OF(sunlight)) as well as external irradiation of tungsten Filament Lamp (TL). The photo-H 2 producing performance of the SEEOF photobioreactor was further improved by using an innovative light dependent resistor (LDR) system, which could maintain sufficient and continual light supply. The results show that combination of OF(sunlight)/TL was more effective than the TL/TL illumination system, leading to a 138% and 136% increase in cumulative H 2 production ( V H 2 ) and H 2 yield ( Y H 2 ) , respectively. The LDR-coupled SEEOF photobioreactor was able to solve the problems of diurnal variation in solar light intensity, enabling the control of a constant total light irradiation intensity on the PBR surface. Combining OF(sunlight)/TL with LDR, the V H 2 and Y H 2 were nearly 27% higher than without LDR. For bioreactor scale up from 50 to 1800 ml working volume, the LDR-coupled SEEOF photobioreactor worked well during daytime, leading to a marked improvement in phototrophic H 2 production with a V H 2 and Y H 2 of 3606 ml and 2.45 mol H 2 /mol HAc, respectively. Moreover, continuous cultures operated at a hydraulic retention time (HRT) of 48 h show a high hydrogen production rate of 32.4 ml/l/h with stable operation for over 15 days. This optimal performance of LDR-coupled SEEOF photobioreactor is superior to most reported results and is a favorable choice of electricity-saving PBR strategy to improve photo-H 2 production efficiency.

  • feasibility study on bioreactor strategies for enhanced photohydrogen production from rhodopseudomonas palustris wp3 5 using optical fiber assisted illumination systems
    International Journal of Hydrogen Energy, 2006
    Co-Authors: Chun Yen Chen, Chimei Lee, Jo Shu Chang
    Abstract:

    Abstract A novel photobioreactor (PBR) was utilized to produce H2 by indigenous purple nonsulfur bacterium Rhodopseudomonas palustris WP3-5 using acetate as the sole carbon source. The PBR was illuminated by combinative light sources including side-light optical fibers (internal light source) as well as external irradiation of halogen Lamp and/or tungsten Filament Lamp. A fill and draw (F/D) operation of PBR was shown to improve the performance of photoH2 production over the performance of batch and continuous cultures under similar operation conditions. For medium improvement, the PBR was conducted under different concentrations of carbon source (acetate) and nitrogen source (glutamic acid). The results show that the highest overall H2 production rate ( v H 2 ) and H2 yield ( Y H 2 ) occurred when the acetate concentration was 32.5 mmol/l and the glutamic acid concentration was 400 mg/l. The optimal acetate and glutamic acid concentration led to a v H 2 and Y H 2 of 20.9 ml/h l and 2.47 mol H2/mol acetate, respectively. The H2 production rate and yield was further enhanced to as high as 38.2 ml/h l and 3.15 mol H2/mol acetate, respectively, while using a ternary-light-source (TLS) system, combining optical fiber, halogen Lamp, and tungsten Filament Lamp (i.e., the OF/HL/TL system). Meanwhile, the high H2 production efficiency with TLS system was stably maintained for nearly 30 day under the F/D operations.

  • hydrogen production by indigenous photosynthetic bacterium rhodopseudomonas palustris wp3 5 using optical fiber illuminating photobioreactors
    Biochemical Engineering Journal, 2006
    Co-Authors: Chun Yen Chen, Chimei Lee, Jo Shu Chang
    Abstract:

    Abstract A novel optical fiber-based photobioreactor was utilized to produce H 2 by indigenous purple nonsulfur bacterium Rhodopseudomonas palustris WP3–5 using acetate as the sole carbon source. Plastic cladding of conventional end-light optical fibers was removed to obtain side-light optical fibers (SLOF), which was inserted into photobioreactors as the internal light source. External irradiation by conventional Lamps may also be provided for the bioreactor as supplemental light sources. The H 2 production performance and light conversion efficiency of the photobioreactor were assessed when various illumination systems were used. The light sources examined included SLOF excited by halogen Lamp (OF-HL), SLOF excited by metal–halide Lamp (OF-MH), tungsten Filament Lamp (TL), halogen Lamp (HL), and binary combinations of the above. Compared with bioreactors illuminated by external Lamps, the OF-HL system produced more H 2 (625 ml), had higher light conversion efficiency (1.80%), and achieved higher H 2 yield (1.19 mol H 2 /mol acetic acid). However, among the single light sources examined, HL gave the highest overall ( ν H 2 ) and specific ( ν s, H 2 ) H 2 production rate of 8.68 ml/l h and 3.01 ml/h g cell, respectively, primarily due to enabling better cell growth. Using OF-MH system resulted in poor H 2 production, indicating that emission spectrum of light sources was critical to photo-H 2 production. Combination of two different light sources appeared to further enhance photo-H 2 production, especially when optical fibers and external Lamps were combined. Combination of OF-HL and TL exhibited the highest H 2 yield, ν H 2 , and ν s, H 2 of 2.64 mol H 2 /mol acetic acid, 17.06 ml/h l, and 9.47 ml/h g cell, respectively. However, the highest total H 2 production (944 ml) and light conversion efficiency (1.42%) were attained when two types of optical fibers were incorporated (i.e., the OF-HL/OF-MH system).

Chimei Lee - One of the best experts on this subject based on the ideXlab platform.

  • phototrophic hydrogen production in photobioreactors coupled with solar energy excited optical fibers
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Chun Yen Chen, Chimei Lee, Ganesh Dattatraya Saratale, Pei Chung Chen, Jo Shu Chang
    Abstract:

    Abstract A novel solar-energy-excited optical fiber (SEEOF) photobioreactor (PBR) was developed to enhance the phototrophic H 2 production by Rhodopseudomonas palustris WP3-5 using acetate (HAc) as the sole carbon source. The PBR was illuminated by combinative light sources, including an internal illumination with optical fiber excited by solar energy (OF(sunlight)) as well as external irradiation of tungsten Filament Lamp (TL). The photo-H 2 producing performance of the SEEOF photobioreactor was further improved by using an innovative light dependent resistor (LDR) system, which could maintain sufficient and continual light supply. The results show that combination of OF(sunlight)/TL was more effective than the TL/TL illumination system, leading to a 138% and 136% increase in cumulative H 2 production ( V H 2 ) and H 2 yield ( Y H 2 ) , respectively. The LDR-coupled SEEOF photobioreactor was able to solve the problems of diurnal variation in solar light intensity, enabling the control of a constant total light irradiation intensity on the PBR surface. Combining OF(sunlight)/TL with LDR, the V H 2 and Y H 2 were nearly 27% higher than without LDR. For bioreactor scale up from 50 to 1800 ml working volume, the LDR-coupled SEEOF photobioreactor worked well during daytime, leading to a marked improvement in phototrophic H 2 production with a V H 2 and Y H 2 of 3606 ml and 2.45 mol H 2 /mol HAc, respectively. Moreover, continuous cultures operated at a hydraulic retention time (HRT) of 48 h show a high hydrogen production rate of 32.4 ml/l/h with stable operation for over 15 days. This optimal performance of LDR-coupled SEEOF photobioreactor is superior to most reported results and is a favorable choice of electricity-saving PBR strategy to improve photo-H 2 production efficiency.

  • feasibility study on bioreactor strategies for enhanced photohydrogen production from rhodopseudomonas palustris wp3 5 using optical fiber assisted illumination systems
    International Journal of Hydrogen Energy, 2006
    Co-Authors: Chun Yen Chen, Chimei Lee, Jo Shu Chang
    Abstract:

    Abstract A novel photobioreactor (PBR) was utilized to produce H2 by indigenous purple nonsulfur bacterium Rhodopseudomonas palustris WP3-5 using acetate as the sole carbon source. The PBR was illuminated by combinative light sources including side-light optical fibers (internal light source) as well as external irradiation of halogen Lamp and/or tungsten Filament Lamp. A fill and draw (F/D) operation of PBR was shown to improve the performance of photoH2 production over the performance of batch and continuous cultures under similar operation conditions. For medium improvement, the PBR was conducted under different concentrations of carbon source (acetate) and nitrogen source (glutamic acid). The results show that the highest overall H2 production rate ( v H 2 ) and H2 yield ( Y H 2 ) occurred when the acetate concentration was 32.5 mmol/l and the glutamic acid concentration was 400 mg/l. The optimal acetate and glutamic acid concentration led to a v H 2 and Y H 2 of 20.9 ml/h l and 2.47 mol H2/mol acetate, respectively. The H2 production rate and yield was further enhanced to as high as 38.2 ml/h l and 3.15 mol H2/mol acetate, respectively, while using a ternary-light-source (TLS) system, combining optical fiber, halogen Lamp, and tungsten Filament Lamp (i.e., the OF/HL/TL system). Meanwhile, the high H2 production efficiency with TLS system was stably maintained for nearly 30 day under the F/D operations.

  • hydrogen production by indigenous photosynthetic bacterium rhodopseudomonas palustris wp3 5 using optical fiber illuminating photobioreactors
    Biochemical Engineering Journal, 2006
    Co-Authors: Chun Yen Chen, Chimei Lee, Jo Shu Chang
    Abstract:

    Abstract A novel optical fiber-based photobioreactor was utilized to produce H 2 by indigenous purple nonsulfur bacterium Rhodopseudomonas palustris WP3–5 using acetate as the sole carbon source. Plastic cladding of conventional end-light optical fibers was removed to obtain side-light optical fibers (SLOF), which was inserted into photobioreactors as the internal light source. External irradiation by conventional Lamps may also be provided for the bioreactor as supplemental light sources. The H 2 production performance and light conversion efficiency of the photobioreactor were assessed when various illumination systems were used. The light sources examined included SLOF excited by halogen Lamp (OF-HL), SLOF excited by metal–halide Lamp (OF-MH), tungsten Filament Lamp (TL), halogen Lamp (HL), and binary combinations of the above. Compared with bioreactors illuminated by external Lamps, the OF-HL system produced more H 2 (625 ml), had higher light conversion efficiency (1.80%), and achieved higher H 2 yield (1.19 mol H 2 /mol acetic acid). However, among the single light sources examined, HL gave the highest overall ( ν H 2 ) and specific ( ν s, H 2 ) H 2 production rate of 8.68 ml/l h and 3.01 ml/h g cell, respectively, primarily due to enabling better cell growth. Using OF-MH system resulted in poor H 2 production, indicating that emission spectrum of light sources was critical to photo-H 2 production. Combination of two different light sources appeared to further enhance photo-H 2 production, especially when optical fibers and external Lamps were combined. Combination of OF-HL and TL exhibited the highest H 2 yield, ν H 2 , and ν s, H 2 of 2.64 mol H 2 /mol acetic acid, 17.06 ml/h l, and 9.47 ml/h g cell, respectively. However, the highest total H 2 production (944 ml) and light conversion efficiency (1.42%) were attained when two types of optical fibers were incorporated (i.e., the OF-HL/OF-MH system).

Hongbo Sun - One of the best experts on this subject based on the ideXlab platform.

  • direct laser writing of superhydrophobic pdms elastomers for controllable manipulation via marangoni effect
    Advanced Functional Materials, 2017
    Co-Authors: Wei Wang, Yuqing Liu, Yan Liu, Bing Han, Huan Wang, Dongdong Han, Jiannan Wang, Yonglai Zhang, Hongbo Sun
    Abstract:

    Direct light-to-work conversion enables manipulating remote devices in a contactless, controllable, and continuous manner. Although some pioneering works have already proven the feasibility of controlling devices through light-irradiation-induced surface tension gradients, challenges remain, including the flexible integration of efficient photothermal materials, multifunctional structure design, and fluidic drag reduction. This paper reports a facile one-step method for preparing light-driven floating devices with functional surfaces for both light absorption and drag reduction. The direct laser writing technique is employed for both arbitrary patterning and surface modification. By integrating the functional layer at the desired position or by designing asymmetric structures, three typical light-driven floating devices with fast linear or rotational motions are demonstrated. Furthermore, these devices can be driven by a variety of light sources including sunlight, a Filament Lamp, or laser beams. The approach provides a simple, green, and cost-effective strategy for building functional floating devices and smart light-driven actuators.

Ganesh Dattatraya Saratale - One of the best experts on this subject based on the ideXlab platform.

  • phototrophic hydrogen production in photobioreactors coupled with solar energy excited optical fibers
    International Journal of Hydrogen Energy, 2008
    Co-Authors: Chun Yen Chen, Chimei Lee, Ganesh Dattatraya Saratale, Pei Chung Chen, Jo Shu Chang
    Abstract:

    Abstract A novel solar-energy-excited optical fiber (SEEOF) photobioreactor (PBR) was developed to enhance the phototrophic H 2 production by Rhodopseudomonas palustris WP3-5 using acetate (HAc) as the sole carbon source. The PBR was illuminated by combinative light sources, including an internal illumination with optical fiber excited by solar energy (OF(sunlight)) as well as external irradiation of tungsten Filament Lamp (TL). The photo-H 2 producing performance of the SEEOF photobioreactor was further improved by using an innovative light dependent resistor (LDR) system, which could maintain sufficient and continual light supply. The results show that combination of OF(sunlight)/TL was more effective than the TL/TL illumination system, leading to a 138% and 136% increase in cumulative H 2 production ( V H 2 ) and H 2 yield ( Y H 2 ) , respectively. The LDR-coupled SEEOF photobioreactor was able to solve the problems of diurnal variation in solar light intensity, enabling the control of a constant total light irradiation intensity on the PBR surface. Combining OF(sunlight)/TL with LDR, the V H 2 and Y H 2 were nearly 27% higher than without LDR. For bioreactor scale up from 50 to 1800 ml working volume, the LDR-coupled SEEOF photobioreactor worked well during daytime, leading to a marked improvement in phototrophic H 2 production with a V H 2 and Y H 2 of 3606 ml and 2.45 mol H 2 /mol HAc, respectively. Moreover, continuous cultures operated at a hydraulic retention time (HRT) of 48 h show a high hydrogen production rate of 32.4 ml/l/h with stable operation for over 15 days. This optimal performance of LDR-coupled SEEOF photobioreactor is superior to most reported results and is a favorable choice of electricity-saving PBR strategy to improve photo-H 2 production efficiency.