•Fundamental information of magnesium phosphate cement has been discussed.•Short brief on reaction mechanisms, and effects of retarder and additives on MPC.•Application of MPC on various structural ...materials as rapid and eco-friendly binder.•Short discussion on physio-mechanical behavior of MPC products from literature.
The prime goal of this review is to expose the recent progresses on the research field of magnesium phosphate cement (MPC) based cementitious material to light through gathering the crucial outcomes of the works done by the global researchers. This paper provides a systematic literature review that is focused on the fundamental information of MPC and the key findings of the physio-mechanical behaviors on various application of MPC products of the evidence of 123 publications published over a period of 38 years from 1980 to 2018. More importantly, this study primarily concentrates on the information collection of the production and utilization of MPC in bio-materials, crack repair in pavements, hazardous waste management, fibre reinforced mortar, particle boards and clinical bio-ceramics using different design mixes of the MPC ingredients by the previous scholars. Additionally, based on the globally published data, the appropriate strength results of the MPC matrices under different material combinations have also discussed here. Even, it identifies various potential and challenging aspects related to the applicability of new dimensional MPC materials. As a final point, this review may encourage the readers to open the new chapter on further application sectors of MPC as a greater scale in the civil engineering aspects, preparing the usable products of daily life for human being and biomedical engineering usages.
•Novel nacre-inspired coating with quadruple hydrogen bonds of UPy was developed.•The typical nacre-like structure can be achieved by one simple solvent evaporation.•Coating displays rapid ...self-healing ability and excellent mechanical properties.•Coatings has barrier properties and sustainable environmental friendliness.
Intelligence polymeric coatings with excellent self-healing ability and mechanical properties, as well as fine shielding and durability, are of enormous significance to metal corrosion protection technology. Herein, a novel biomimetic nanocomposite coating was obtained by integrating self-healing bio-based polymer and modified graphene oxide hybrids into the artificial nacre material system in this work. Based on the formation of a typical nacre-like structure, the material shows excellent strain resistance (617%) and ultimate tensile strength (5.1 MPa), realizing a special combination of practical repair performance and mechanical strength of the wise coating. Benefiting from the high internal resin network density quadruple dynamically reversible supramolecular hydrogen bonds, the coating material exhibited an exceptional and efficient self-healing ability at room temperature (10 min). In addition, the distinguished long-term corrosion media barrier properties of the biomimetic coating are endowed by graphene oxide (GO) platelets with high barrier properties. Importantly, the selection of bio-based epoxy resins improves the sustainable economic application of engineered coatings in contrast to the application of traditional epoxy resin coatings. Therefore, this kind of bio-based biomimetic coating displays broad application potential as an intelligent self-healing protective material in electronic devices, engineering equipment, and other fields.
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•rGO-Fe3O4/Oil film can move accurately to the corrosion area and effectively block the corrosive medium.•The self-healing performance of the rGO-Fe3O4/Oil film was suitable for a ...variety of extremely harsh environments.•rGO-Fe3O4/Oil film was capable of repeating self-healing at the same area.•rGO-Fe3O4/Oil exhibited superior corrosion resistant performance.
Localized corrosion is caused by less protection of the metal substrate, which causes catastrophic damage for load-bearing material. It is significant to rescue corroded areas in a smart and controllable manner. Herein, a newfangled strategy for directional repairing rGO-Fe3O4/Oil coating drove by magnetic force to mitigate local corrosion was proposed. The new directional repairing system was consisted of low-viscosity oil and magnetically responded rGO-Fe3O4 filler via hydrothermal synthesis. Easy-flowing oil acted as the driving of the self-healing coatings because they can readily reconnect to heal minor flaw. Due to the synergistic effect of the magnetic responsiveness and the impermeability of rGO-Fe3O4, the flowable rGO-Fe3O4/Oil film can move to the corroded area under the action of magnetic field and effectively mitigated the corrosion examined by the scanning vibrating electrode technique (SVET). Moreover, the rGO-Fe3O4/Oil film was capable of repeating self-healing ability in air, pH = 1 (acid), pH = 7 (salt), and pH = 14 (alkali) solutions at the same area. The excellent anti-corrosion performance of rGO-Fe3O4/Oil coating was attributed to rGO-Fe3O4 tremendously improved its physical barrier effect and prolonged the penetration path of the corrosive mediums. Such a strategy could offer a potential approach for the preparation of anticorrosion materials that could accurately and intelligently repaired the localized corrosion on metal substrate.
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•Different typical graphene-based carbons were introduced to ZIF-67 derived Co-NC to form characteristic MOFs/graphene composites.•Rapid carbonization induces the various degrees of ...micropore self-repairing/blocking for ZIF-67/graphene composite materials.•Adverse micropore repairing and blocking delivers the lower sodium storage performances of Co-NC/rGO.
Metal-organic framework materials (MOFs) and graphene composite materials are the promising anode for sodium ion battery due to the excellent specific performances. Introducing graphene gives MOFs the increased active sites and improved electronic conductivity, showing a positive effect for the overall enhancement of properties. In this work, different from the enhanced sodium storage capacity after introducing reduced graphene oxides into MOFs derived materials in previous researches, the micropore structures of MOFs/graphene composite materials in the same systems are repaired by a self-repairing/blocking process during rapid carbonization process, which thus hinders the diffusion kinetics of Na+ and decreases the sodium storage capacity negatively.
Solar-heated absorption has become an effective technique to handle the crisis of crude oil spill. Although photothermal absorbents could efficiently clean up crude oil in situ, oil recovery methods ...such as squeezing absorbents have a negative impact on structural integrity and performance of absorbents, shortening the service life of the device. Herein, a solar-driven carbon-doped self-repairing polyurethane sponge (CSPU) is fabricated for absorption and recovery of crude oil. Chitosan-derived N-doped porous carbon (NPC) as photothermal filler and 2-hydroxyethyl disulfide (HDES) as chain extender are introduced into sponge in situ through free foaming. The firm load of NPC endows CSPU with good light absorption of 97.1% and a stable photothermal conversion performance. Additionally, the solar-driven self-repairing property promotes CSPU to timely repair the structural damage caused in oil recovery process. Consequently, CSPU exhibits a high crude oil absorption of 23.5 g/g, and it still maintains a good oil absorption and recovery efficiency after friction, ultrasonic treatment or multiple absorption-recovery cycles. This strategy combining photothermal oil absorption and solar-driven self-repairing provides a sustainable and durable solution for addressing crude oil spills.
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•Facile method for photothermal polyurethane sponge with all-in-one design•Sponge could absorb high-viscous crude oil through photothermal conversion.•Crude oil recovery was possible by compressing absorption saturated sponge.•Photothermal effect induced sponge to repair its damaged structure caused by compression.•The stable absorption (23.5 g/g) and efficient recovery of oil were achieved.
Cleaning data with Llunatic Geerts, Floris; Mecca, Giansalvatore; Papotti, Paolo ...
The VLDB journal,
07/2020, Letnik:
29, Številka:
4
Journal Article
Odprti dostop
Data cleaning (or data repairing) is considered a crucial problem in many database-related tasks. It consists in making a database consistent with respect to a given set of constraints. In recent ...years, repairing methods have been proposed for several classes of constraints. These methods, however, tend to hard-code the strategy to repair conflicting values and are specialized toward specific classes of constraints. In this paper, we develop a general
chase-based repairing framework
, referred to as
Llunatic
, in which repairs can be obtained for a large class of constraints and by using different strategies to select preferred values. The framework is based on an elegant formalization in terms of labeled instances and partially ordered preference labels. In this context, we revisit concepts such as upgrades, repairs and the chase. In
Llunatic
, various repairing strategies can be slotted in, without the need for changing the underlying implementation. Furthermore,
Llunatic
is the first data repairing system which is DBMS-based. We report experimental results that confirm its good scalability and show that various instantiations of the framework result in repairs of good quality.
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•Janus micromotors are developed for efficient thrombolysis and inhibition of thrombosis relapse.•Gas bubble generation amplifies cavitation effect of ultrasound to promote thrombus ...penetration.•Micromotors are equipped with dual targeting capabilities to thrombi and the damaged endothelia.•RGD-mediated accumulation and ultrasound-driven penetration lead to full removal of thrombi.•H2O2-scavenging and resveratrol release and endothelial repairing inhibit thrombosis recurrence.
Thrombosis seriously endangers human health with high incidence and mortality worldwide, and the clinical treatment is challenged by low bioavailability of thrombolytic agents, high bleeding risk and thrombosis relapse. Herein, ultrasound-powered Janus micromotors with stimuli-responsive multiple release capabilities are developed for efficient thrombolysis and inhibition of thrombosis recurrence. Resveratrol-loaded hyaluronic acid (HARes) nanoparticles (NPs) and urokinase plasminogen activator (uPA) were entrapped into H2O2-sensitive poly(1,4-cyclohexanedimethanol-co-oxalate) (POX) microparticles (MPs), followed by polydopamine capping and RGD grafting to obtain Janus rJPox@u-HARes MPs. After RGD-mediated delivery to the thrombus site, the peroxalate ester bonds of POX are oxidized by the elevated H2O2 to produce CO2, and the MP collapse accelerates the local release of uPA and HARes NPs. The resulting CO2 bubbles amplify the cavitation effect of ultrasound to promote thrombus penetration and site-specific uPA thrombolysis. The endothelial cell targeting and sustained resveratrol release from HARes NPs dramatically improve endothelial cell viability, nitric oxide production and migration. Compared with free drug administration, the uPA loading into MPs significantly extends the half-life (15 folds) and bioavailability (7 folds), while the resveratrol inoculation into NPs increases the bioavailability 29 times. On an acute lower limb thrombosis model, the thrombus accumulation of MPs is promoted by RGD-mediated interactions with the activated platelets and ultrasound-driven penetration into thrombi, leading to almost full removal of blood clots. The H2O2-scavenging capability of POX, sustained resveratrol release and efficient thrombolysis alleviate oxidative stresses, eliminate coagulation biomarkers and repair the damaged endothelial layer to effectively inhibit thrombosis relapse. It is demonstrated that rJPox@u-HARes/US treatment could not only achieve safe and site-specific thrombolytic therapy at the early stage but also restore vascular homeostasis to effectively prevent thrombosis recurrence.
The design of fault-tolerant structures against the breakdown of heterogeneous ferroelectric films is essential to enhance the breakdown strength. Based on the self-repairing theory, heterogeneous ...ferroelectric PbZr0.52Ti0.48O3 (PZT) film capacitors with a fault-tolerant structures against breakdown were synthesized by utilizing dielectric/electrolytic dual characteristics of the amorphous aluminum oxide film (AmAO). The PZT/AmAO composite films with Au top electrodes exhibited significant weak breakdown at low voltages, whereas the breakdown in the composite films with Al top electrodes have been repaired and no longer occurred. Compared to PZT(100 nm)/AmAO(120 nm) composite films with Au top electrodes, breakdown strength of PZT(100 nm)/AmAO(120 nm) composite films with Al top electrodes improves from 278 MV/m to 477 MV/m, energy storage density increased from 14.3 J/cm3 to 22.5 J/cm3, since the heterogeneous interface and structural defects have been repaired by adaptive anodizing of Al electrode under high electric field. Cross-sectional SEM images have confirmed the formation of fresh aluminium oxide films (AAO) at the interfaces of AmAO/Al and PZT/AmAO during the application of an electric field. Defects have been effectively repaired, resulting in an increase in breakdown strength. This study establishes a theoretical and technical foundation for the design of fault-tolerant structures against breakdown in heterogeneous ferroelectric films.
•Integration of multi-dimensional mechanical properties.•Bridging the contradiction between self-repairing and mechanical properties.•Outstanding elasticity contributes to the development of flexible ...sensors.•Reprocessability of Thermosetting Polymers.•Excellent optical properties and durability.
Achieving robust, high elasticity, transparency, self-repairing, reprocessability and durability simultaneously remains a huge challenge. In this work, we propose a simple strategy to prepare an ultra-high strength, outstanding elasticity, self-repairing and reprocessable poly (thiourethane-urea) (PTUU) film based on interlocking hydrogen bonds (IHBs) and reversible topological networks. The IHBs between its main chains make it have ultra-high tensile strength (61.6 MPa) and good scratch resistance. It is the highest tensile strength ever recorded for crosslinked self-repairing materials at medium temperature thus far. The synergistic effect of IHBs and topological networks makes it high elasticity and can repair more than 90 % of the mechanical strength. Rearrangement of reversible topology network at high temperature endows PTUU with reprocessability, and the mechanical strength remains more than 85 % after reprocessing for three times. In addition, PTUU films have high transmittance (96.6 %, 0.5 mm), low haze, high refractive index and excellent durability, which have broad application prospects in transparent protective materials, optical lenses, stretchable fibers, wearable electronic devices and other fields.
Smart slippery liquid-infused porous surfaces (SLIPSs) have aroused remarkable attention owing to tremendous application foreground in biomedical instruments and industry. However, challenges still ...remain in fabricating durable SLIPSs. In this work, a fast and highly efficient self-repairing slippery surface (SPU-60M) was fabricated based on a polyurethane membrane and silicone oil. By introducing a great quantity of reversible disulfide bonds into the polymer backbone and hydrogen bonds in the polymer interchain, this SLIPS material could be quickly repaired in 15 min with 97.8% healing efficiency. Moreover, the self-healing efficiency could be maintained at 42.75% after the 10th cutting–healing cycle. Notably, SPU-60M showed excellent self-repairing ability not only in an ambient environment but also in an underwater environment and at ultralow temperatures. Besides, the icing delay time (DT) of SPU-60M could be prolonged to 1182 s at −15 °C, and the ice adhesion strength was only 10.33 kPa at −30 °C. In addition, SPU-60M had excellent anti-fouling performance with BSA adsorption of 2.41 μg/cm2 and Escherichia coli CFU counts of 41 × 104. These findings provide a facile way to design highly efficient self-repairing SLIPSs with multifunctionality.
