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Zibo Li, Yutong Wu, Jingjie Nan, Xiaoduo Tang, Junhu Zhang, Bai Yang
The degree of crumpling affects the optoelectronic properties of graphene, which are very important for the performance of graphene-based devices and materials. In this article, we report an approach to tune the formation of wrinkles on single-layer graphene (SLG) by silicon nanopillar (SNP) arrays. By using gold nanoparticles as an etching mask, SNP arrays with different heights could be prepared by tuning the duration of etching. The formation of wrinkles on these SNP arrays was studied systematically. We found that thermal treatment could lead to a wrapping behavior of graphene around SNP arrays, which was accompanied by the emergence of many more wrinkles...
November 25, 2016: Nanotechnology
S Drijkoningen, S D Janssens, P Pobedinskas, S Koizumi, M K Van Bael, K Haenen
Nanocrystalline diamond (NCD) membranes are promising candidates for use as sensitive pressure sensors. NCD membranes are able to withstand harsh conditions and are easily fabricated on glass. In this study the sensitivity of heavily boron doped NCD (B:NCD) pressure sensors is evaluated with respect to different types of supporting glass substrates, doping levels and membrane sizes. Higher pressure sensing sensitivities are obtained for membranes on Corning Eagle 2000 glass, which have a better match in thermal expansion coefficient with diamond compared to those on Schott AF45 glass...
October 21, 2016: Scientific Reports
Jae-Hui Nam, Young-Jun Choi, Jae Yun Lim, Joon Hong Min, Won-Serk Kim
High-intensity focused ultrasound (HIFU) is regarded as an effective skin-lifting device; however, literature regarding treatment of the aging neck and décolletage with HIFU is scarce. Our study aimed to evaluate the efficacy of combination with HIFU and low-fluence Q-switched Nd:YAG (LQSNY) laser on the aging neck and décolletage. Nineteen women were assessed. HIFU at two visits and LQSNY laser at six visits were used to irradiate the neck and chest. At week 16, improvements were rated using the Dedo classification, Fabi/Bolton Chest Wrinkle Scale (FBCWS), and Global Aesthetic Improvement Scales (GAIS)...
October 20, 2016: Lasers in Medical Science
Etienne Jambon-Puillet, Dominic Vella, Suzie Protière
We study the effect of film density on the uniaxial compression of thin elastic films at a liquid-fluid interface. Using a combination of experiments and theory, we show that dense films first wrinkle and then fold as the compression is increased, similarly to what has been reported when the film density is neglected. However, we highlight the changes in the shape of the fold induced by the film's own weight and extend the model of Diamant and Witten [Phys. Rev. Lett., 2011, 107, 164302] to understand these changes...
October 21, 2016: Soft Matter
Digendranath Swain, Anurag Gupta
A cutaneous wound may rupture during healing as a result of stretching in the skin and incompatibility at the wound-skin interface, among other factors. By treating both wound and skin as hyperelastic membranes, and using a biomechanical framework of interfacial growth, we study rupturing as a problem of cavitation in nonlinear elastic materials. We obtain analytical solutions for deformation and residual stress field in the skin-wound configuration while emphasizing the coupling between wound rupture and wrinkling in the skin...
October 6, 2016: Journal of Biomechanics
Anna Augustyniak, Helena Rotsztejn
OBJECTIVE: The aim of the research was to establish the influence of IPL treatment on skin aging in the eye area. MATERIAL AND METHODS: This study included 24 women, aged 38 – 63 years (mean age was 48.04) with Fitzpatrick skin type II and III who underwent 5 successive treatment sessions with an IPL in two-week intervals. The Cutometer (Courage + Khazaka electronic) reference test was an objective method for the assessment of the biomechanical properties of the skin...
October 20, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Saturnino Marco Lupi, Matteo Cislaghi, Silvana Rizzo, Ruggero Rodriguez Y Baena
BACKGROUND: The onset of perioral wrinkles often prompts patients to request treatment. This aesthetic deterioration linked to aging may be associated with tooth and alveolar bone loss in fully edentulous patients. PURPOSE: To evaluate perioral wrinkles before and after maxillary and mandibular rehabilitation with implant-retained dentures in fully edentulous patients. METHODS: In this prospective cohort, single-center, blinded study, patients requiring maxillary and mandibular rehabilitation with implant-retained dentures were enrolled...
2016: Clinical, Cosmetic and Investigational Dentistry
Raida Zouari, Dorsaf Moalla-Rekik, Zouheir Sahnoun, Tarek Rebai, Semia Ellouze-Chaabouni, Dhouha Ghribi-Aydi
BACKGROUND: Lipopeptide microbial surfactants are endowed with unique surface properties as well as antimicrobial, anti-wrinkle, moisturizing and free radical scavenging activities. They were introduced safely in dermatological products, as long as they present low cytotoxicity against human cells. The present study was undertaken to evaluate the in vitro antioxidant activities and the wound healing potential of Bacillus subtilis SPB1 lipopeptide biosurfactant on excision wounds induced in experimental rats...
October 14, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Milan Shrestha, Gih-Keong Lau
This Letter presents a tunable window device based on microscopic wrinkling of a transparent elastomeric surface. "Crack-free" microscopic wrinkling of a 50-nm ZnO thin film is possible on a highly adhesive acrylic elastomer membrane (VHB 4910) upon partial release from a large radial pre-stretch of membrane. This ZnO-based tunable window device demonstrates reversible tunability between transparent and translucent states. At zero compression with a flat surface, the device is transparent with a 93% in-line transmittance at 550-nm wavelength...
October 1, 2016: Optics Letters
Harini C Krishnan, Catherine E Gandour, Joshua L Ramos, Mariah C Wrinkle, Joseph J Sanchez-Pacheco, Lisa C Lyons
STUDY OBJECTIVE: Insufficient sleep in individuals appears increasingly common due to the demands of modern work schedules and technology use. Consequently, there is a growing need to understand the interactions between sleep deprivation and memory. The current study determined the effects of acute sleep deprivation on short- and long-term associative memory using the marine mollusk Aplysia californica, a relatively simple model system well known for studies of learning and memory. DESIGN: Aplysia were sleep deprived for 9 h using context changes and tactile stimulation prior to or after training using the operant learning paradigm, learning that food is inedible (LFI)...
October 10, 2016: Sleep
So Eun Park, Sang Seok Kim, Chul Woo Kim, Young Her
No abstract text is available yet for this article.
October 2016: Annals of Dermatology
Jae Ho Jeon, Sahng-Kyoon Jerng, Kamran Akbar, Seung-Hyun Chun
The deposition of thin and uniform dielectric film on graphene is an important step for electronic applications. Here, we tackled this problem by combining a simple chemical treatment of graphene surface and a modification of standard atomic layer deposition (ALD). Instead of common approaches trying to convert hydrophobic graphene surface into hydrophilic one, we took the opposite way by applying a self-assembled-monolayer, hexamethyldisilazane (HMDS) to make defect-independent, more hydrophobic surface condition...
October 13, 2016: ACS Applied Materials & Interfaces
Sara Hintze, Samantha Smith, Antonia Patt, Iris Bachmann, Hanno Würbel
Finding valid indicators of emotional states is one of the biggest challenges in animal welfare science. Here, we investigated in horses whether variation in the expression of eye wrinkles caused by contraction of the inner eyebrow raiser reflects emotional valence. By confronting horses with positive and negative conditions, we aimed to induce positive and negative emotional states, hypothesising that positive emotions would reduce whereas negative emotions would increase eye wrinkle expression. Sixteen horses were individually exposed in a balanced order to two positive (grooming, food anticipation) and two negative conditions (food competition, waving a plastic bag)...
2016: PloS One
Tayyebeh Soltani, Byeong- Kyu Lee
In this study, we report the synthesis of high purity reduced graphene oxide (rGO) from pristine graphite via a fast and cost-effective one-step ultrasonic reduction method. Ultrasonic treatment was employed to avoid the harsh reaction conditions, including high temperature and use of highly toxic hydrazine, required for the conventional rGO preparation method. The high temperature produced during the ultrasound irradiation at low temperature and short reaction time enabled the reduction of graphene oxide (GO) into rGO without the use of toxic chemicals...
October 4, 2016: Journal of Colloid and Interface Science
Won-Kyu Lee, Junmo Kang, Kan-Sheng Chen, Clifford J Engel, Woo-Bin Jung, Dongjoon Rhee, Mark C Hersam, Teri W Odom
This paper describes how delamination-free, hierarchical patterning of graphene can be achieved on prestrained thermoplastic sheets by surface wrinkling. Conformal contact between graphene and the substrate during strain relief was maintained by the presence of a soft skin layer, resulting in the uniform patterning of three-dimensional wrinkles over large areas (>cm(2)). The graphene wrinkle wavelength was tuned from the microscale to the nanoscale by controlling the thickness of the skin layer with 1 nm accuracy to realize a degree of control not possible by crumpling, which relies on delamination...
October 11, 2016: Nano Letters
Hyeon Jun Sim, Changsoon Choi, Shi Hyeong Kim, Kang Min Kim, Chang Jun Lee, Youn Tae Kim, Xavier Lepró, Ray H Baughman, Seon Jeong Kim
Stretchable fiber and yarn triboelectric nanogenerator are sought for such applications as wearable sensing system such as cloth communication devices, electronic textiles, and robotic sensory skin. Unfortunately, previously reported triboelectric fiber and yarn are difficult to have stretchable property. We introduce here a new type of stretchable and weavable triboelectric fibers with microdiameter dimensions. The stretchable triboelectric fibers can be reversibly stretched up to 50% in tensile direction while generating voltage output proportional to the applied tensile strain...
October 11, 2016: Scientific Reports
Antonietta Stellavato, Luisana Corsuto, Antonella D'Agostino, Annalisa La Gatta, Paola Diana, Patrizia Bernini, Mario De Rosa, Chiara Schiraldi
Hyaluronic Acid (HA)-based dermal formulations have rapidly gained a large consensus in aesthetic medicine and dermatology. HA, highly expressed in the Extracellular Matrix (ECM), acts as an activator of biological cascades, stimulating cell migration and proliferation, and operating as a regulator of the skin immune surveillance, through specific interactions with its receptors. HA may be used in topical formulations, as dermal inducer, for wound healing. Moreover, intradermal HA formulations (injectable HA) provide an attractive tool to counteract skin aging (e...
2016: PloS One
Hao Sun, Sankha Mukherjee, Chandra Veer Singh
Two new graphene allotropes, penta-graphene and phagraphene, have been proposed recently with unique electronic properties, e.g. quasi-direct band gap, direction-dependent Dirac cones and tunable Fermi velocities. However, their mechanical properties have not been fully studied yet. In this work, we have performed extensive density functional theory calculations to evaluate the mechanical properties of these two materials and compared with graphene, graphane, and pentaheptite. Our simulations show that the ultimate tensile strength (UTS) and the strain corresponding to UTS in both penta-graphene and phagraphene are smaller than that of graphene...
September 29, 2016: Physical Chemistry Chemical Physics: PCCP
Mayuree Kanlayavattanakul, Nattaya Lourith, Puxvadee Chaikul
ETHNOPHARMACOLOGICAL RELEVANCE: While rice is one of the most important global staple food sources its extracts have found many uses as the bases of herbal remedies. Rice extracts contain high levels of phenolic compounds which are known to be bioactive, some of which show cutaneous benefits and activity towards skin disorders. This study highlights an assessment of the cellular activity and clinical efficacy of rice panicle extract, providing necessary information relevant to the development of new cosmetic products...
October 6, 2016: Journal of Ethnopharmacology
Ryo Futahashi
Dragonflies including damselflies are colorful and large-eyed insects, which show remarkable sexual dimorphism, color transition, and color polymorphism. Recent comprehensive visual transcriptomics has unveiled an extraordinary diversity of opsin genes within the lineage of dragonflies. These opsin genes are differentially expressed between aquatic larvae and terrestrial adults, as well as between dorsal and ventral regions of adult compound eyes. Recent topics of color formation in dragonflies are also outlined...
October 2016: Current Opinion in Insect Science
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