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Preparation of graphene/polypropylene composites with high dielectric constant and low dielectric loss constructing a segregated graphene network.
RSC Adv
November 2021
School of Polymer Science and Engineering, Qingdao University of Science and Technology Qingdao 266042 China.
In this paper, a reduced graphene oxide/polypropylene (rGO/PP) dielectric composite with high dielectric constant and low dielectric loss at a low filler content was prepared constructing a segregated moderately-reduced graphene network by encapsulation of GO on PP latex particles and subsequent reduction of GO by hydrazine hydrate. GO/PP latex was prepared through artificial PP latex preparation in the presence of GO based on the solution-emulsification technique. As the emulsification proceeded, GO could self-assemble to become encapsulated on the surface of PP latex particles composed of PP and maleic-anhydride-grafted-PP because of the hydrogen bonding interaction between maleic-anhydride-grafted-PP and GO nanosheets.
View Article and Find Full Text PDFEvidence for tissue-specific defence-offence interactions between milkweed and its community of specialized herbivores.
Mol Ecol
June 2022
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, USA.
Coevolution between plants and herbivores often involves escalation of defence-offence strategies, but attack by multiple herbivores may obscure the match of plant defence to any one attacker. As herbivores often specialize on distinct plant parts, we hypothesized that defence-offence interactions in coevolved systems may become physiologically and evolutionarily compartmentalized between plant tissues. We report that roots, leaves, flower buds and seeds of the tropical milkweed (Asclepias curassavica) show increasing concentrations of cardenolide toxins acropetally, with latex showing the highest concentration.
View Article and Find Full Text PDFTemporal Changes of Adsorbed Layer Thickness and Electrophoresis of Polystyrene Sulfate Latex Particles after Long Incubation of Oppositely Charged Polyelectrolytes with Different Charge Densities.
Polymers (Basel)
July 2021
University of Education, Vietnam National University, Hanoi, 144 Xuan Thuy, Cau Giay, Hanoi 100000, Vietnam.
The different desorption concepts of the two polyelectrolytes PTMA5M and PTMC5M, which have similar molecular weights and differ in the charge density on the polystyrene sulfate latex (PSL) particles by 25 times, and with various charge densities in a long incubation, were systematically investigated based on hydrodynamic adsorbed layer thickness (δ) and electrophoretic mobility (EPM) under two ionic strengths in the present study. Herein, in the case of highly charged polyelectrolyte PTMA5M, desorption continued for 4 h and re-adsorbing proceeded after a longer incubation time higher than 4 h. Meanwhile, in the case of lowly charged polyelectrolyte PTMC5M, an adsorption-desorption equilibrium was suggested to take into account the unchanging of both δ and EPM.
View Article and Find Full Text PDFPessaries (mechanical devices) for managing pelvic organ prolapse in women.
Cochrane Database Syst Rev
November 2020
The Warrell Unit, Department of Gynaecology, St Mary's Hospital, Manchester University Foundation NHS Trust, Manchester, UK.
Background: Pelvic organ prolapse is a common problem in women. About 40% of women will experience prolapse in their lifetime, with the proportion expected to rise in line with an ageing population. Women experience a variety of troublesome symptoms as a consequence of prolapse, including a feeling of 'something coming down' into the vagina, pain, urinary symptoms, bowel symptoms and sexual difficulties.
View Article and Find Full Text PDFAnatomical Basis and Clinical Application of the First Metatarsal Proximal Perforator-Based Neurocutaneous Vascular Flap.
Clin Anat
July 2020
Department of Orthopedics, Xinhua Hospital (Chongming) of Shanghai Jiao Tong University, Shanghai, China.
Forefoot defects caused by accidents are very common, but their reconstruction remains a substantial challenge for plastic surgeons. The purpose of this study is to determine the anatomical structure of the first metatarsal proximal perforator-based flap and to propose its clinical application. The study was divided into two parts: an anatomical study and a clinical application.
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