Layer-by-layer
(LbL) assembly is a widely used tool for engineering materials and
coatings. In this Perspective, dedicated to the memory of ACS Nano associate editor Prof. Dr. Helmuth Möhwald,
we discuss the developments and applications that are to come in LbL
assembly, focusing on coatings, bulk materials, membranes, nanocomposites,
and delivery vehicles.
This article focuses on the issue of decentralized event-triggered synchronization control for complex networks (CNs) under nonperiodic denial-of-service (DoS) attacks. First, to alleviate the pressure on network bandwidth, a decentralized event-triggered scheme is employed at each coupled node to decide whether the synchronization signal is transmitted to the communication network. Then, an event-based synchronization error model is established for CNs under DoS attacks, where the communication network is assumed to be composed of multiple transmission channels and DoS attacks will independently compromise each of channels. Based on the constructed model, sufficient conditions that assuring the secure synchronization of the system are analyzed with the assistance of Lyapunov stability theory. Meanwhile, the synchronization controller gains are designed by solving a set of linear matrix inequalities. The efficiency of the study is finally validated by simulations.
K E Y W O R D Scomplex networks (CNs), decentralized synchronization control, DoS attacks, event-triggered scheme
INTRODUCTIONComplex networks (CNs) are now widely used to model many practical systems with large scale, such as food webs, subway, power grid and so forth. 1-3 A typical CN is generally composed by a number of nodes each of which represents a real individual and links denoting the relationships between different individuals. Given the architecture characteristic
Layer-by-layer (LBL) films of poly(lactic acid) nanoparticles (PLA NPs) and poly(ethyleneimine) (PEI) were fabricated as a novel drug-delivery system. The PLA NPs, which encapsulated pyrene as a model drug, were prepared by nanoprecipitation methods. The assembly process of PLA NPs/PEI LBL films was monitored by UV-vis spectroscopy, and the load of pyrene in the multilayer films was verified by fluorescence spectroscopy. The morphology of the PLA NPs/PEI LBL films was observed by SEM. The release profile of pyrene from the LBL films in PBS solutions was further studied, and the result indicated that the PLA NPs/PEI films were capable of sustainably releasing pyrene as expected. The fabrication of PLA NPs/PEI LBL films provides a new facile method for drug delivery and paves the way for loading multiple types of drugs into a single LBL film.
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