Wet-spinning of PEDOT:PSS/Functionalized-SWNTs Composite: a Facile Route Toward Production of Strong and Highly Conducting Multifunctional Fibers

With the aim of fabricating multifunctional fibers with enhanced mechanical properties, electrical conductivity and electrochemical performance, we develop wet-spinning of composite formulation based on functionalized PEG-SWNT and PEDOT:PSS. The method of addition and loading are directly correlated to the quality and the ease of spinnability of the formulation and to the mechanical and electrical properties of the resultant fibers. Both the fiber modulus (Y) and strength (σ) scaled linearly with PEG-SWNT volume fraction (Vf). A remarkable reinforcement rate of dY/dVf = 417 GPa and dσ/dVf = 4 GPa were obtained when PEG-SWNTs at Vf ≤ 0.02. Further increase of PEG-SWNTs loading (i.e. up to Vf 0.12) resulted in further enhancements up to 22.8 GPa and 254 MPa in Modulus and ultimate stress, respectively. We also show the enhancement of electrochemical supercapacitor performance of composite fibers. These outstanding mechanical, electrical and electrochemical performances place these fibers among the best performing multifunctional composite fibers.

Exploiting high quality PEDOT:PSS–SWNT composite formulations for wet-spinning multifunctional fibers

In order to exploit the inherent properties of carbon nanotubes (CNT) in any polymer composite, systematic control of carbon nanotube loading and protocols that mitigate against CNT bundling are required. If such composites are to be rendered in fiber form via wet-spinning, then CNT bundling during the coagulation process must also be avoided. Here we have achieved this by utilizing highly exfoliated single walled carbon nanotubes (SWNT) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonicacid) (PEDOT:PSS) to obtain wet-spinnable composite formulations at various nanotube volume fractions (Vf). The addition of only 0.02 Vf of aggregate-free and individually dispersed SWNT resulted in a significant enhancement of modulus, tensile strength, electrical conductivity and two cell electrode specific capacitance of PEDOT:PSS–SWNT composite fibers to 5.2 GPa, 200 MPa, 450 S cm−1 and 59 F g−1 by the rate of dY/dVf = 89 GPa, dσ/dVf = 3.2 GPa, dS/dVf = 13 300 S cm−1 and 6 folds, respectively.

Synthesis and structural properties of Anhydrous Rare Earth Cinnamates, [RE(cinn)3]

Anhydrous rare earth tris(cinnamates) [RE(cinn)3] (RE = La–Lu, Y and Sc and cinnH = trans-cinnamic acid) were prepared by metathesis in water and by direct reaction of the metal with cinnamic acid in a 1,2,4,5-tetramethylbenzene flux at ca. 200 °C. X-ray crystal structure determinations and X-ray powder data show that, in the solid state, the larger lanthanoids (La–Dy) form an isomorphous polymeric series consisting of homoleptic nine-coordinate metal centres bonded to three chelating and bridging tridentate cinnamates. The late REIII cinnamate (RE = Dy, Ho–Lu, Y) complexes also form linear one-dimensional polymeric chains with all RE metal atoms being seven-coordinate. The cinnamates are either bound tridentate bridging in a μ-η2:η1 fashion, or μ-η1:η1syn-syn bidentate bridging. A structural break occurs at dysprosium which has been characterised in both crystallographic forms, and gives solely the late RE form when precipitated at 80 °C. ScIII cinnamate was also isolated as an analytically pure precipitate which was, again, found to be anhydrous in nature. A structural change was identified by powder XRD between the late REIII cinnamates and ScIII cinnamate.

Suppression of necking in incremental sheet forming

Incremental sheet forming enables sheet metal to deform above a conventional strain-based forming limit. The mechanics reason has not been clearly explained yet. In this work, the stress-based forming limit was utilized for through-thickness necking analysis to explain this uncovered question. Stress-based forming limit which has path-independency shows that the stress states in top, middle and bottom surfaces did not exceed the forming limit curve at the same time and each layer has different stress state in terms of their deformation history to suppress necking. It has been found that it is important to consider the gradient stress profile following the deformation history for the proper forming limit analysis of incremental sheet forming. © 2014 Elsevier Ltd. All rights reserved.

Spiritual connections made through music making: sharing faith and music in an Australian setting

The musical involvement of people over the centuries is fundamentally interwoven with spiritual experiences (Seifert 2011). This paper discusses the connection between music and spirituality in an inter-denominational group in the southeastern suburbs of Melbourne. With ethical clearance, through semi-structured interviews with two church leaders and the music worship team, subsequently employing Interpretative Phenomenological Analysis (IPA), I analysed and codified the data gathered. Two overarching themes are discussed: insights into music and spirituality; and connecting music to worship with self and others. The findings show that music in worship may provide a rich pathway for people to explore, experience, and express their spirituality, and to connect to the wider multicultural society. It also adds to the current debates on whether music has spiritual significance for some people apart from community expressions of spirituality through music. Limitations of the current study are knowledged and generalizations cannot be made regarding connections to music and spirituality. However, the findings do indicate that music in worship can enrich one’s spiritual experience and connection with God and others.

The show must go on’ : older entertainers making music in the community in Melbourne, Australia

Globally countries are faced with an aging population and Australia is no different. This creates challenges for the maintenance of well-being which can be enhanced by active engagement in society. There is extensive research that confirms that engagement in music by older people is positively related to individual and community wellbeing. Music engagement encompasses a range of social participation and has the potential to recognise the contribution of older people to their local communities. Music participation can contribute to a better quality of life, particularly in relation to health and happiness. There are many possible forms of music engagement. This study is part of an on-going Deakin University and Monash University research project, Well-being and ageing: community, diversity and the arts in Victoria. This article focuses on three members of a mixed voluntary singing group formed by older residents of an outer suburban community in Melbourne, Australia. This group, The Skylarkers, were established in 1999 as a four-part choir. Over the years the nature of the choir has changed under subsequent music directors. Since 2009 the group has focused on music theatre repertoire and performance style. Membership of the group is fluid reflecting changing life circumstances of the members but the ensemble is resilient. This small amateur music theatre group is based in suburban Melbourne, rehearses weekly and performs regularly at retirement villages, nursing homes and facilities for senior citizens. This article presents a phenomenological qualitative single case study of members of the Skylarkers. In this study, interview data were gathered in 2011-2012 and analysed using interpretative phenomenological analysis. Two significant themes emerged that concern musical self-identity and gaining a sense of purpose and fulfilment. The Skylarkers are more than a choir; they are an amateur entertainment troupe that engages with each other and the wider community. This resilient group holds true to the motto ‘the show must go on’.

Thermomechanical properties of Ni-Ti shape memory wires containing nanoscale precipitates induced by stress-assisted ageing.

This paper systematically examines the thermomechanical properties and phase transformation behaviour of slightly Ni-rich Ni-Ti biomedical shape memory wires containing homogeneously distributed nanoscale precipitates induced by stress-assisted ageing. In contrast to previous studies, particular attention is paid to the role of precipitates in impeding twin boundary movement (TBM) and its underlying mechanisms. The size and volume fraction of precipitates are altered by changing the ageing time. The martensitic transformation temperatures increase with prolonged ageing time, whereas the R-phase transformation temperature remains relatively unchanged. The stress-strain behaviour in different phase regions during both cooling and heating is comprehensively examined, and the underlying mechanisms for the temperature- and thermal-history-dependent behaviour are elucidated with the help of the established stress-temperature phase diagram. The effect of precipitates on TBM is explored by mechanical testing at 133K. It is revealed that the critical stress for TBM (σcr) increases with increasing ageing time. There is a considerable increase of 104MPa in σcr in the sample aged at 773K for 120min under 70MPa compared with the solution-treated sample, owing to the presence of precipitates. The Orowan strengthening model of twinning dislocations is insufficient to account for this increase in σcr. The back stress generation is the predominant mechanism for the interactions between precipitates and twin boundaries during TBM that give rise to the increase in σcr. Such results provide new insights into the thermomechanical properties of precipitate containing Ni-Ti biomedical shape memory wires, which are instructive for developing high-performance biomedical shape memory alloys.

Experiencing God and expressing his love through words and sounds

“The role that music plays in religion and spiritual life is evident throughout history and across cultures” (Lipe 2002, 210). Spirituality and religion are often used together and interchangeably as people may encounter spirituality through an organized religion or individualized religion; connection to nature or personal spiritual practices or people may seek scientific answers and truth as a form of spirituality. This paper situates itself within a wider study on Spirituality and Well-being: Music in the community that started in 2013 in Australia. Both authors are music educators and organists discussing their experience through narrative reflection across two continents in relation to how music contributes to spirituality within religious context and impacts on well-being. They recognize and acknowledge that music is one of God’s gifts and have been included throughout church history through songs and form an important aspect of worship (Vaught 2009). Spiritual connections are not confined to the institution of the church or to religion but are concerned with the connection “we can feel between ourselves and something vast, unseen, mysterious, and wondrous” (Millar 2000, 140). The findings of this are limited in the sense that it only focuses on two voices hence generalizations cannot be made to other musicians or church settings. However, it can be argued that music in worship can enrich and enhance one’s connection with God and with others through sound. The authors argue “music can provide many people with ways of experiencing and expressing their spirituality in their life that otherwise they might find difficult to access in other tangible ways” (Hays and Minichiello, 2005a, 95).