Electrospun polyacrylic acid polymer fibers functionalized with metallophthalocyanines for photosensitizing and gas sensing applications
- Zugle, Ruphino, Nyokong, Tebello
- Authors: Zugle, Ruphino , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/243543 , vital:51162 , xlink:href="https://doi.org/10.1080/10601325.2012.662006"
- Description: The photophysical and photochemical properties of tetraaminophthalocyanine complexes of lutetium and zinc covalently linked to polyacrylic acid were studied alongside those of unsubstituted zinc phthalocyanine within the same polymeric fiber matrix. All three phthalocyanines within the solid fiber matrices showed photoactivity by the generation of singlet oxygen as was observed in solution. The fluorescence behaviors of the composite fibers equally parallel those in solution. For the unsubstituted zinc phthalocyanine composite, the fiber showed fluorescence quenching on interaction with gaseous nitrogen dioxide similar to that in DMF and, thus could be a promising nanofabric material in developing optoelectronic devices that are responsive to the gas.
- Full Text:
- Date Issued: 2012
- Authors: Zugle, Ruphino , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/243543 , vital:51162 , xlink:href="https://doi.org/10.1080/10601325.2012.662006"
- Description: The photophysical and photochemical properties of tetraaminophthalocyanine complexes of lutetium and zinc covalently linked to polyacrylic acid were studied alongside those of unsubstituted zinc phthalocyanine within the same polymeric fiber matrix. All three phthalocyanines within the solid fiber matrices showed photoactivity by the generation of singlet oxygen as was observed in solution. The fluorescence behaviors of the composite fibers equally parallel those in solution. For the unsubstituted zinc phthalocyanine composite, the fiber showed fluorescence quenching on interaction with gaseous nitrogen dioxide similar to that in DMF and, thus could be a promising nanofabric material in developing optoelectronic devices that are responsive to the gas.
- Full Text:
- Date Issued: 2012
Physico-chemical properties of lutetium phthalocyanine complexes in solution and in solid polystyrene polymer fibers and their application in photoconversion of 4-nitrophenol
- Zugle, Ruphino, Nyokong, Tebello
- Authors: Zugle, Ruphino , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/243520 , vital:51160 , xlink:href="https://doi.org/10.1016/j.molcata.2012.02.010"
- Description: The photophysical and photochemical behavior of two phthalocyanine complexes of lutetium peripherally substituted with tetraphenoxy and tetra-2-pyridiloxy groups were studied in solution and when dispersed in polystyrene polymer fiber. The phthalocyanines were found not to fluoresce significantly in solution and not at all within the fiber matrix as compared with standard unsubstituted zinc phthalocyanine. They showed very promising photoactivity in solution with high singlet oxygen quantum yields. Their photoactivity within the polymer fiber matrix was also demonstrated with the photoconversion of 4-nitrophenol, a water pollutant. The photodegradation process with both phthalocyanines follows first order kinetics similar to that observed for the zinc phthalocyanine and the photo-products were found to be hydroquinone, benzoquinone and 4-nitrocatechol.
- Full Text:
- Date Issued: 2012
- Authors: Zugle, Ruphino , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/243520 , vital:51160 , xlink:href="https://doi.org/10.1016/j.molcata.2012.02.010"
- Description: The photophysical and photochemical behavior of two phthalocyanine complexes of lutetium peripherally substituted with tetraphenoxy and tetra-2-pyridiloxy groups were studied in solution and when dispersed in polystyrene polymer fiber. The phthalocyanines were found not to fluoresce significantly in solution and not at all within the fiber matrix as compared with standard unsubstituted zinc phthalocyanine. They showed very promising photoactivity in solution with high singlet oxygen quantum yields. Their photoactivity within the polymer fiber matrix was also demonstrated with the photoconversion of 4-nitrophenol, a water pollutant. The photodegradation process with both phthalocyanines follows first order kinetics similar to that observed for the zinc phthalocyanine and the photo-products were found to be hydroquinone, benzoquinone and 4-nitrocatechol.
- Full Text:
- Date Issued: 2012
Photooxidation of 4-chlorophenol sensitized by lutetium tetraphenoxy phthalocyanine anchored on electrospun polystyrene polymer fiber
- Zugle, Ruphino, Antunes, Edith M, Khene, Samson M, Nyokong, Tebello
- Authors: Zugle, Ruphino , Antunes, Edith M , Khene, Samson M , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/245787 , vital:51405 , xlink:href="https://doi.org/10.1016/j.poly.2011.11.005"
- Description: An electrospun polystyrene (PS) fiber incorporating tetraphenoxy phthalocyanine complex of lutetium (LuTPPc/PS) as a photosensitizer was applied for the degradation of 4-chlorophenol in aqueous solution in the presence of visible light. The photocatalytic activity of the LuTPPc in the fiber was compared to that of zinc phthalocyanine (ZnPc) incorporated into the PS fiber, and the former showed higher activity. UV–Vis spectral changes of sample solutions indicated transformation of the analyte with first order kinetics and half-lives that are within one and half hours for LuTPPc/PS. Products identified from the spectral changes and gas chromatography were benzoquinone, hydroquinone and 4,4′-dihydroxydiphenol suggesting that the photodegradation of 4-chlorophenol was through both Types I and II mechanisms.
- Full Text:
- Date Issued: 2012
- Authors: Zugle, Ruphino , Antunes, Edith M , Khene, Samson M , Nyokong, Tebello
- Date: 2012
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/245787 , vital:51405 , xlink:href="https://doi.org/10.1016/j.poly.2011.11.005"
- Description: An electrospun polystyrene (PS) fiber incorporating tetraphenoxy phthalocyanine complex of lutetium (LuTPPc/PS) as a photosensitizer was applied for the degradation of 4-chlorophenol in aqueous solution in the presence of visible light. The photocatalytic activity of the LuTPPc in the fiber was compared to that of zinc phthalocyanine (ZnPc) incorporated into the PS fiber, and the former showed higher activity. UV–Vis spectral changes of sample solutions indicated transformation of the analyte with first order kinetics and half-lives that are within one and half hours for LuTPPc/PS. Products identified from the spectral changes and gas chromatography were benzoquinone, hydroquinone and 4,4′-dihydroxydiphenol suggesting that the photodegradation of 4-chlorophenol was through both Types I and II mechanisms.
- Full Text:
- Date Issued: 2012
Jazz Band at the Open OHR Festival
- Date: 2012
- Subjects: McGregor, Chris -- 1936-1990 , Beckett, Harry , Jazz , Jazz musicians , Open OHR Festival
- Type: Image
- Identifier: vital:13881 , http://hdl.handle.net/10962/d1001784 , McGregor, Chris -- 1936-1990 , Beckett, Harry , Jazz , Jazz musicians
- Description: Colour photo of a Jazz Band at the Open ORH Festival in Mainz (Germany) in 1986. From left to right: Chris McGregor playing keyboards, a musician, a bass guitarist, a percussionist, an electric guitarist, a double-bassist, a singer, Harry Beckett playing trumpet and an alto saxophonist. The photo has been taken from the audience.
- Full Text: false
- Date Issued: 2012
- Date: 2012
- Subjects: McGregor, Chris -- 1936-1990 , Beckett, Harry , Jazz , Jazz musicians , Open OHR Festival
- Type: Image
- Identifier: vital:13881 , http://hdl.handle.net/10962/d1001784 , McGregor, Chris -- 1936-1990 , Beckett, Harry , Jazz , Jazz musicians
- Description: Colour photo of a Jazz Band at the Open ORH Festival in Mainz (Germany) in 1986. From left to right: Chris McGregor playing keyboards, a musician, a bass guitarist, a percussionist, an electric guitarist, a double-bassist, a singer, Harry Beckett playing trumpet and an alto saxophonist. The photo has been taken from the audience.
- Full Text: false
- Date Issued: 2012
African Women Chartered Accountants (AWCA) award
- Date: 2012 , 2022-10-04
- Subjects: Bam, Brigalia , Bam, Brigalia -- Awards
- Language: English
- Type: award , realia
- Identifier: http://hdl.handle.net/10948/56743 , vital:57163
- Description: Dr. Brigalia Bam received the African Women Chartered Accountants (AWCA) award in 2012. It is awarded to women who represents an exceptional woman who has played a significant role in the uplifting of black women and has demonstrated quality and successful leadership in areas of governance and business to attain gender equality with the 2012 Woman of Substance award. , During the month of August, the AWCA holds its annual Woman of Substance Awards Fundraising Gala, where the award is bestowed upon deserving recipients. The event is not only about honoring a woman who has reached the pinnacle of their professional journey and has demonstrated commitment towards the development of women and communities, but also a platform whereby funds are raised for the AWCA bursary program. , Donated/gifted to Nelson Mandela University Archives , Forms part of: Brigalia Bam collection
- Full Text: false
- Date Issued: 2012
- Date: 2012 , 2022-10-04
- Subjects: Bam, Brigalia , Bam, Brigalia -- Awards
- Language: English
- Type: award , realia
- Identifier: http://hdl.handle.net/10948/56743 , vital:57163
- Description: Dr. Brigalia Bam received the African Women Chartered Accountants (AWCA) award in 2012. It is awarded to women who represents an exceptional woman who has played a significant role in the uplifting of black women and has demonstrated quality and successful leadership in areas of governance and business to attain gender equality with the 2012 Woman of Substance award. , During the month of August, the AWCA holds its annual Woman of Substance Awards Fundraising Gala, where the award is bestowed upon deserving recipients. The event is not only about honoring a woman who has reached the pinnacle of their professional journey and has demonstrated commitment towards the development of women and communities, but also a platform whereby funds are raised for the AWCA bursary program. , Donated/gifted to Nelson Mandela University Archives , Forms part of: Brigalia Bam collection
- Full Text: false
- Date Issued: 2012
Chris McGregor, Harry Beckett and Lucky Ranku standing outside a bus
- Date: 2012
- Subjects: McGregor, Chris -- 1936-1990 , Beckett, Harry , Ranku, Lucky , Jazz , Jazz musicians
- Type: Image
- Identifier: vital:13853 , http://hdl.handle.net/10962/d1001687 , McGregor, Chris -- 1936-1990 , Beckett, Harry , Ranku, Lucky , Jazz , Jazz musicians
- Description: Colour photo. From left to right: Lucky Ranku, Harry Beckett and Chris McGregor standing outside a bus.
- Full Text: false
- Date Issued: 2012
- Date: 2012
- Subjects: McGregor, Chris -- 1936-1990 , Beckett, Harry , Ranku, Lucky , Jazz , Jazz musicians
- Type: Image
- Identifier: vital:13853 , http://hdl.handle.net/10962/d1001687 , McGregor, Chris -- 1936-1990 , Beckett, Harry , Ranku, Lucky , Jazz , Jazz musicians
- Description: Colour photo. From left to right: Lucky Ranku, Harry Beckett and Chris McGregor standing outside a bus.
- Full Text: false
- Date Issued: 2012