Topological patterns on polymer surfaces can significantly alter and control adhesion. In this study, the effect of surface wrinkles on a spherical surface on adhesion has been studied. Surface wrinkling induced by swelling of a crosslinked polydimethylsiloxane elastomer constrained by a stiff, thin surface layer (silicate) is used to produce topographic features of various length scales over a large curved area. By controlling the properties of the stiff layer and the applied strain conditions, surface wrinkles of varying amplitude and wavelength are obtained. The effect of wrinkle morphology on adhesion is quantified, and the results display a transition from enhancement of adhesion to decrease depending upon wrinkle dimensions. A simple phenomenological model is proposed that describes the change of adhesion behavior as a function of wrinkle morphology. Our results provide a critical understanding toward tuning the adhesion behavior of nonplanar surfaces consisting of periodic topographic structures. © 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011

No abstract

Mainstream AIDS activists in the 1980s responded to demonizing and stigmatizing representations of the HIV infected by attempting to “normalize” people living with AIDS. However, some gay men in the 1980s and early 1990s, catalyzed by antigay politics since the late 1970s and overwhelmed by the excessively apocalyptic and overdetermined representations of AIDS in popular media, deliberately embraced the role of sexual and medical pariah, celebrated social anxieties about their public danger as vectors of infection, and repudiated the sympathetically sentimentalizing images of “AIDS victims.” Adopting the rhetoric of punk culture and its forms of self-representation—particularly the punk rock-derived “fanzine” or “'zine”—these “infected faggots” and “diseased pariahs” exposed and celebrated their HIV status and erotic adventurism. However, the writers, editors, and publishers of AIDS 'zines contended with the competing claims of performative self-representation, on one hand, and of a readership, on the other. The result in such 'zines as Infected Faggot Perspectives and Diseased Pariah News was a continuous crisis of self-representation evident even in the format and technology of the 'zines print publication and circulation.

No abstract

No abstract