Patterns of behavior: Complexes of the cluster {Mo72Fe30} and the surfactant dioctadecyldimethylammonium chloride (DODMACl) produced in CHCl3 form patterns with a honeycomb structure at the air/water interface after evaporation of the solvent (see SEM image). The concentration of DODMACl in CHCl3 is critical to whether the {Mo72Fe30} macroanions remain in the aqueous or CHCl3 phase.

It is a big challenge for resource-limited mobile devices (MDs) to execute various complex and energy-consumed mobile applications. Fortunately, as a novel computing paradigm, edge computing (MEC) can provide abundant computing resources to execute all or parts of the tasks of MDs and thereby can greatly reduce the energy of MD and improve the QoS of applications. However, offloading workflow tasks to the MEC servers are liable to external security threats (e.g., snooping, alteration). In this paper, we propose a security and energy efficient computation offloading (SEECO) strategy for service workflows in MEC environment, the goal of which is to optimize the energy consumption under the risk probability and deadline constraints. First, we build a security overhead model to measure the execution time of security services. Then, we formulate the computation offloading problem by incorporating the security, energy consumption and execution time of workflow application. Finally, based on the genetic algorithm (GA), the corresponding coding strategies of SEECO are devised by considering tasks execution order and location and security services selection.Extensive experiments with the variety of workflow parameters demonstrate that SEECO strategy can achieve the security and energy efficiency for the mobile applications.

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The europium polyoxometalate anion, [EuW(10)O(36)](9-), can be transferred from an aqueous phase into a chloroform phase through encapsulation by dioctadecyldimethylammonium (DODMA(+)). The formed (DODMA)(9)[EuW(10)O(36)] complexes can self-assemble into ordered, uniform porous honeycomb films by using a simple solvent-evaporation method at the air/water interface without any extra moist airflow. TEM, SEM, and AFM observations show porous morphologies with pores having a diameter of about 2 microm and a wall depth of about 0.8 microm. The microlamellar structure and crystalline nanoaggregates of (DODMA)(9)[EuW(10)O(36)] complexes in films are characterized by XRD measurements and high-resolution TEM observations. During self-assembly into porous honeycomb films, it is speculated that the cooled microwater droplets that are induced by the quick evaporation of chloroform act as the templates for pores and that (DODMA)(9)[EuW(10)O(36)] complexes are deposited around pores. Because of the intrinsic fluorescence of [EuW(10)O(36)], the photoluminescent porous honeycomb films of (DODMA)(9)[EuW(10)O(36)] complexes can emit fluorescence when they are excited by UV light. It is expected that this will meet more requirements of new materials for fluorescence, separation membranes, microstructured electrode surfaces, containers, and reactors.

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The ordered honeycomb films of dioctadecyldimethylammonium (DODMA + )-encapsulated sandwich-type [(Mn(H 2 O) 3 ) 2 (WO 2 ) 2 -(BiW 9 O 33 ) 2 ] 10À ({Mn 2 Bi 2 W 20 } 10À ) are used as templates to directionally electrodeposit gold nanoparticles into their macropores. Consequently, the prepared hierarchical Au-filled films present a strong surface-enhanced Raman scattering of rhodamine 6G molecules.Scheme 1 The experimental procedure from the fabrication of the honeycomb film at an air/water interface to the electrodeposition of Au nanoparticles into the honeycomb macropores.

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