Abstract: Disclosed in the present disclosure is a double-deck multi-span bridge construction method. According to the double-deck bridge construction method of the present disclosure, construction is carried out by using a method of disassembling a support jig frame in a graded and span-separated mode, an upper chord jig frame and a lower chord jig frame can be used in a recycle manner, and construction costs are reduced. In addition, a construction period of building the support jig frame is shortened, and other construction operations can be synchronously carried out on a span in which the jig frame is disassembled, for example, fire retardant coating construction can be carried out on a mounted bridge deck after the jig frame is disassembled, and the construction period of a double-deck multi-span bridge is effectively shortened.

Abstract: Graphene oxide aerogel beads (GOABs) are formed that have a core/shell structure where a smooth shell covers a multi-layer core. The smooth shell and the layers of the multilayer core comprise graphene oxide or reduced graphene oxide. The GOABs can include a phase-change material encapsulated within the multi-layer core. The GOABs can be combined or decorated with Fe3O4 nanoparticles or MoS2 microflakes for various applications. The GOABs are formed from aqueous slurries of graphene oxide that is extruded as drops into an aqueous solution of a coagulant where GOABs are formed. The GOABs are washed and freeze dried, after which, the GOABs can be reduced as desired by chemical or thermal means. Impregnation can be carried out with the phase-change material.

Abstract: A method of preparing a fire extinguishing core-shell microcapsule by a one-pot oil-in-oil/ water emulsion technique. The method includes dissolving a fluid fluoroketone or hydrofluorocarbon fire extinguishing core material and a polymer shell material into a volatile solvent to form a composite mixture. The composite solution is emulsified into a polar phase and a non-polar phase by adjusting a concentration of a surfactant or via mechanical agitation to provide interfacial tension tuning. The volatile solvent is evaporated to precipitate a microcapsule having a fire extinguishing material core and a polymer shell. In a further aspect, the method includes incorporating the core-shell microcapsules in a polymer matrix.

Abstract: A method is provided for fabricating thermoplastic fiber-reinforced polymer material (FRP) and fiber metal laminate (FML) composites by a resin-infusion process with a liquid thermoplastic poly methyl methacrylate (PMMA) resin, which has a mixed viscosity of 200 cP at room temperature. The curing process may be initiated by benzoyl peroxide in the methyl methacrylate matrix, which follows a radical polymerization process. A high impact resistance lightweight battery enclosure may be formed by a composite of ductile metal (aluminum alloy, magnesium alloy, titanium alloy, or steel alloy) with fiber-reinforced polymers (FRP). The fiber material in the FRP can be carbon fiber, glass fiber, basalt fiber, Kevlar fiber, UHMWPE fiber, or any combination thereof.

Abstract: A phase change microcapsule having high blending fluidity and high latent heat of phase change, and a preparation method thereof is provided. The preparation method of the phase change microcapsules includes following steps of 1) heating and melting an organic phase change material to obtain a liquid core material; 2) evenly dispersing an emulsifying and dispersing agent in water, then adding carbamide, ammonium chloride and polyphenol, and mixing them evenly, followed by adjusting a pH value to 2.5-3.5 to obtain an aqueous phase solution; 3) adding the liquid core material and a defoaming agent to the aqueous phase solution to perform an emulsification to obtain an oil-in-water emulsion; and 4) adding a formaldehyde solution and a dispersing agent to the oil-in-water emulsion, after reaction is completed, performing a filtration, washing and drying.

Abstract: Disclosed herein are phase change materials microencapsulated by a microcapsule having two shells, the first shell (directly encapsulating the phase change material) being an organic polymeric material and the second shell (an outer shell) being made from a doped TiO2 material. The microcapsules disclosed herein may be particularly useful for improving the energy efficiency of indoor environments, as well as providing compositions that they are applied to (e.g. paints) with self-cleaning properties.

Abstract: A DL microcapsule is formed that has a core-double layer shell structure with a liquid diisocyanate comprising molecule core and a double layer shell. The double layer shell has an inner layer comprising a polyurea (PU) and an outer layer comprising a poly(urea formaldehyde) foam (PUF). A self-healing coating is formulated from a multiplicity of DL microcapsules in a polymeric matrix. A polymer matrix can be formed by the polyaddition of an epoxy resin. A self-healing coated substrate is formed by applying the self-healing coating precursor that combines DL-microcapsules with an uncured polymeric resin as a dispersion on a substrate and curing the polymeric resin. The self-healing coated substrate is capable of resisting corrosion when abraded. The substrate can be any metal substrate, for example an iron or steel substrate. The polymeric resin can be an epoxy resin.

Abstract: Graphene oxide aerogel beads (GOABs) are formed that have a core/shell structure where a smooth shell covers a multi-layer core. The smooth shell and the layers of the multilayer core comprise graphene oxide or reduced graphene oxide. The GOABs can include a phase-change material encapsulated within the multi-layer core. The GOABs can be combined or decorated with Fe3O4 nanoparticles or MoS2 microflakes for various applications. The GOABs are formed from aqueous slurries of graphene oxide that is extruded as drops into an aqueous solution of a coagulant where GOABs are formed. The GOABs are washed and freeze dried, after which, the GOABs can be reduced as desired by chemical or thermal means. Impregnation can be carried out with the phase-change material.

Abstract: The disclosure provides a poly(urea-formaldehyde) microcapsule, which comprises encapsulated in the poly(urea-formaldehyde) microcapsule an organofluorine silane of the general formula (I) A3C(CA2)mSiR1yX(3-y) (I), wherein in formula (I) A is either fluorine (F) or hydrogen (H), wherein at least 50% of atoms A are fluorine, X is chloro or a group RO, wherein R is a linear or branched alkyl radical of 1 to 4 carbon atoms, R1 is a linear, branched or cyclic alkyl group of 1 to 8 carbon atoms, n=0 or 2, y=0 or 1 or 2 and m=0 to 20, encapsulated within the microcapsule. The disclosure also provides self-healing coating compositions comprising such polymeric microcapsules and methods of preventing or slowing corrosion using such coating compositions.

Abstract: An apparatus for fabricating microcontainers, the apparatus comprising: a mixer configured to contain a liquid and having a plurality of zones, the plurality of zones comprising: a reaction zone configured to contain a solution of an etching agent and a plurality of hollow glass beads for etching of the hollow glass beads therein; a sinking zone below and in fluid connection with the reaction zone and configured to allow separation of etched hollow glass beads from intact hollow glass beads therein by sinking of the etched hollow glass beads; and a collection zone below and in fluid connection with the sinking zone and configured to collect the etched hollow glass beads therein while minimizing over-etching in the collection zone.

Abstract: An apparatus for fabricating microcontainers, the apparatus comprising: a mixer configured to contain a liquid and having a plurality of zones, the plurality of zones comprising: a reaction zone configured to contain a solution of an etching agent and a plurality of hollow glass beads for etching of the hollow glass beads therein; a sinking zone below and in fluid connection with the reaction zone and configured to allow separation of etched hollow glass beads from intact hollow glass beads therein by sinking of the etched hollow glass beads; and a collection zone below and in fluid connection with the sinking zone and configured to collect the etched hollow glass beads therein while minimizing over-etching in the collection zone.

Abstract: The disclosure provides a polyurethane microcapsule consisting of a polymerization product of methylene diphenyl diisocyanate (MDI) prepolymer with a polyol, the polyurethane microcapsule comprising a liquid isocyanate compound encapsulated within the microcapsule. The disclosure also provides self-healing coating compositions comprising such polymeric microcapsules and methods of preventing or slowing corrosion using such coating compositions.

Abstract: The disclosure provides a poly(urea-formaldehyde) microcapsule, which comprises encapsulated in the poly(urea-formaldehyde) microcapsule an organofluorine silane of the general formula (I) A3C(CA2)xSiR1yX(3-y) (I), wherein in formula (I) A is either fluorine (F) or hydrogen (H), wherein at least 50% of atoms A are fluorine. X is chloro or a group RO, wherein R is a linear or branched alkyl radical of 1 to 4 carbon atoms, R1 is a linear, branched or cyclic alkyl group of 1 to 8 carbon atoms, n=0 or 2, y=0 or 1 or 2 and m=0 to 20, encapsulated within the microcapsule. The disclosure also provides self-healing coating compositions comprising such polymeric microcapsules and methods of preventing or slowing corrosion using such coating compositions.