ORCID Profile
0000-0003-1553-9650
Current Organisation
Chulalongkorn University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Emerald
Date: 27-06-2008
DOI: 10.1108/14779960810888329
Abstract: The purpose of this paper is to explore the major players operating on Al‐Saha Al‐Siyasia online community, which is by far the most widely spread political online community in Saudi Arabia receiving 20 million page views per month. In addition to using “focused” silent observation to observe Al‐Saha Al‐Siyasia over a period of three months (May‐July 2007) and thematic content analysis to examine 2,000 topics (and their replies) posted to Al‐Saha Al‐Siyasia during the period of May‐June 2007, semi‐structured interviews were conducted (in Arabic) with 15 key informants to report their perceptions regarding Islamic fundamentalists, extremists and liberals, etc. on their forum. The results of this study indicate that there are three main players operating in Al‐Saha Al‐Siyasia : Islamic fundamentalists, extremists, and liberals. Islamic fundamentalists who are the vast majority on this community use the forum as a medium to promote their image and defend their way of practising the religion. Extremists on the other hand, although their numbers in the forum are very small, use the forum as a medium to establish their credibility and the grounds for their actions. Finally, the liberals use the forum to communicate with the public, and advocate their plans for social reform, invite people to adopt a less strict version of Islam and adopt secularism as a way of life. This paper continues the first comprehensive descriptive study of the size and influence of the Islamic fundamentalists, extremists, and liberals in their activities as online communities.
Publisher: American Chemical Society (ACS)
Date: 30-07-2013
DOI: 10.1021/LA401987Y
Abstract: A series of novel hiphiles were designed for self-assembly into chiral morphologies, the hiphiles consisting of a glutamic acid (Glu) headgroup connected through an 11-carbon alkoxy chain to a diphenyldiazenyl (Azo) group and terminated with a variable length alkyl chain (R-Azo-11-Glu, where R denotes the number of carbons in the distal chain). TEM imaging of hiphile aggregates self-assembled from heated, methanolic, aqueous solution showed that chiral order, expressed as twisted ribbons, helical ribbons, and helically based nanotubes, increased progressively up to a distal chain length containing eight carbons, and then decreased with further increases in distal chain length. TEM and CD showed that the chiral aggregations of single enantiomers were influenced by the molecular chirality of the headgroup. However, the assembly of D,L-10-Azo-11-Glu into nanotubes demonstrated that chiral symmetry breaking effected by the azo group was also relevant to the chiral organization of the hiphiles. The chiral order of aggregate morphologies was additionally affected by the temperature and solvent composition of assembly in a manner correlated to the mechanism driving assembly i.e., D,L-10-Azo-11-Glu was sensitive to the temperature of assembly but less so to solvent composition, while L-14-Azo-11-Glu was sensitive to solvent composition and not to temperature. FTIR and UV-vis spectroscopic investigations into the organization of the head and azo groups, in chiral and achiral structures, illustrated that a balance of the influences of the hydrophilic and hydrophobic components on self-assembly was required for the optimization of the chiral organization of the self-assembled structures.
Publisher: American Chemical Society (ACS)
Date: 26-09-2012
DOI: 10.1021/LA3030606
Abstract: Four hiphiles with L-aspartic acid headgroups (Asp) and a diphenyldiazenyl group (Azo) contained within the hydrophobic tails were designed and synthesized for self-assembly into helically based nanotubes. The hiphiles of the form R'-{4-[(4-alkylphenyl)diazenyl]phenoxy}alkanoyl-L-aspartic acid (where R' is 10 or 11) varied only in alkyl chain lengths either side of the azo group, having 4, 7, or 10 carbon distal chains and 10 or 11 carbon proximal chains (R-Azo-R'-Asp, where R denotes the number of carbons in the distal chain and R' denotes the number of carbons in the proximal chain). Despite the molecular similarities, distinct differences were identified in the chiral order of the structures self-assembled from hot methanolic aqueous solutions using microscopy and spectroscopic analyses. This was reflected in dominant thermodynamic aggregate morphologies that ranged from amorphous material for 10-Azo-10-Asp, through twisted ribbons (196 ± 49 nm pitch) for 7-Azo-11-Asp, to the desired helically based nanotubes for 4- and 7-Azo-10-Asp (81 ± 11 and 76 ± 6 nm diameters, respectively). Another key variable in the self-assembly of the hiphiles was the use of a second method to precipitate aggregates from solution at room temperature. This method enabled the isolation of thermodynamically unstable and key transitional structures. Helical ribbons were precursor structures to the nanotubes formed from 4- and 7-Azo-10-Asp as well as the wide, flattened nanotube structures (587 ± 85 nm width) found for 4-Azo-10-Asp. Overall, the results highlighted the interplay of influence of the headgroup and the hydrophobic tail on self-assembly, providing a basis for future rational design of self-assembling hiphiles.
Location: Japan
Location: Japan
No related grants have been discovered for Soraj Hongladarom.