Nature regulates complex structures in space and time via feedback loops, kinetically controlled transformations, under energy dissipation to allow non-equilibrium processes. Although man-made static self-assemblies realize excellent control over hierarchical molecular programming, managing their temporal destiny by self-regulation is a largely unsolved challenge. Herein, we introduce generic concept the domain programming lifetimes of switchable closed systems. We conceive dormant...

Abstract Designing the reversible interactions of biopolymers remains a grand challenge for an integral mimicry mechanically superior biological composites. Yet, they are key to synergistic combinations stiffness and toughness by providing sacrificial bonds with hidden length scales. To address this challenge, dynamic polymers were designed low glass‐transition temperature T g bonded quadruple hydrogen‐bonding motifs, subsequently assembled high‐aspect‐ratio synthetic nanoclays generate...

Although advances have been reported to mimic the mechanically excellent structure of natural nacre, larger-scale applications are still limited due time and energy-intensive preparation pathways. Herein, we demonstrate that simple high-shear homogenization dispersions containing biobased high molecular weight sodium carboxymethyl cellulose (700 kg/mol, CMC) montmorillonite (MTM), serving as soft energy-dissipating phase reinforcing platelets, respectively, can be used prepare large-area...

An ultrathin polyurethane/MXene flexible nanocomposite film with synergistic mechanical properties and superior electromagnetic interference shielding is fabricated <italic>via</italic> a nacre-mimetic strategy.

Natural composites are hierarchically structured by combination of ordered colloidal and molecular length scales. They inspire future, biomimetic, lightweight nanocomposites, in which extraordinary mechanical properties reach understanding mastering hierarchical structure formation as tools to engineer multiscale deformation mechanisms. Here we describe a self-assembled, cholesteric nanocomposite with well-defined colloid-based helical supramolecular hydrogen bonds engineered on the level...

Sustainable alternatives for high-performance and functional materials based on renewable resources are intensely needed as future present-day, fossil-based materials. Nanochitin represents an emerging class of highly crystalline bionanoparticles with high intrinsic mechanical properties the ability conjugation into owing to reactive amine hydroxyl groups. Herein we demonstrate that hydrogels containing surface-deacetylated chitin nanofibrils micrometer length average diameters 9 nm, imaged...

Gaining spatially resolved control over the mechanical properties of materials in a remote, programmable, and fast‐responding way is great challenge toward design adaptive structural functional materials. Reversible, temperature‐sensitive systems, such as polymers equipped with supramolecular units, are good model system to gain detailed information target large‐scale property changes by exploiting reversible crosslinking scenarios. Here, it demonstrated that coassembled elastomers based on...

Cellulose nanofibrils (CNFs) are considered next generation, renewable reinforcements for sustainable, high-performance bioinspired nanocomposites uniting high stiffness, strength and toughness. However, the challenges associated with making well-defined CNF/polymer nanopaper hybrid structures well-controlled polymer properties have so far hampered to deduce a quantitative picture of mechanical space deformation mechanisms, limits ability tune control by rational design criteria. Here, we...

Nature provides design paradigms for adaptive, self-healing, and synergistic high-performance structural materials. Nacre's brick-and-mortar architecture is renowned combining stiffness, toughness, strength, lightweightness. Although elaborate approaches exist to mimic its static structure performance, incorporate functionalities the engineering world, there a profound gap in addressing adaptable mechanical properties, particularly using remote, quick, spatiotemporal triggers. Here, we...

The improved efficiency of latent heat energy utilization has been worldwide accepted as an effective way to alleviate the associated environmental problems resulting from increasing consumption in present day. Herein, a novel phase change material (PCM) paraffin-wax-embedded polymer microcapsule with graphene oxide (GO) platelet-patched shell structure (wax@PDVB@GO) was prepared synergistic stable system where GO and amphiphilic macromolecule 1,1-diphenylethylene capped hydrolyzed...

Abstract Bioinspired nanocomposites with high levels of reinforcement hold great promise for future, green lightweight, and functional engineering materials, but they suffer from slow, tedious, nonscalable preparation routes, that typically only lead to very thin films. A rapid facile dry powder processing technique is introduced generate bioinspired nanocomposite materials at fractions reinforcements (50 wt%) millimeter scale thickness. The process uses drying vitrimer‐coated nanoplatelets...

Block copolymers of poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and poly(oligo(ethylene glycol) methyl ether (POEGMA) with varying block sizes were synthesized by consecutive reversible addition-fragmentation chain transfer (RAFT) polymerization then exposed to cellulose substrates different anionic charge density. The extent dynamics quaternized PDMAEMA-b-POEGMA adsorption on regenerated cellulose, nanofibrils (CNF), (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)-oxidized (TOCNF)...

Abstract In spite of efforts to fabricate self‐assembled energy storage nanopaper with potential applications in displays, greenhouses, and sensors, few studies have investigated their multiple stimuli‐sensitivities. Here, an opto‐ thermal‐rewrite phase change material/cellulose nanofibril (PCM/CNF) mechanical regulated performance is facilely fabricated, through 5 min sonication PCMs CNFs aqueous system. The combination PCM CNF not only guarantees the recyclability without leakage, but also...

We passivated TEMPO-oxidized cellulose nanofibrils (TOCNF) toward human immunoglobulin G (hIgG) by modification with block and random copolymers of poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) poly(oligo(ethylene glycol) methyl ether (POEGMA). The reversibly adsorbed on TOCNF were highly effective in preventing nonspecific interactions hIgG, especially if short PDMAEMA blocks used. In such cases, total protein rejection was achieved. This is contrast to typical blocking agents, which...

Abstract Designing the reversible interactions of biopolymers remains a grand challenge for an integral mimicry mechanically superior biological composites. Yet, they are key to synergistic combinations stiffness and toughness by providing sacrificial bonds with hidden length scales. To address this challenge, dynamic polymers were designed low glass‐transition temperature T g bonded quadruple hydrogen‐bonding motifs, subsequently assembled high‐aspect‐ratio synthetic nanoclays generate...

Purpose: To optimize the preparation of insulin-chitosan nanoparticles (ICNS) using response surface methodology (RSM).Methods: ICNS were formulated through ionic cross linking method. The effects ratio between insulin and chitosan, pH medium rotation speed on encapsulation efficiency (EE) investigated. Box-Behnken experimental design coupled with method was employed to formulation. Properties such as particle shape, size, zeta potential release behavior analyzed.Results: best formulation...

通过紫外引发聚合方法制备了无机交联的聚(N-异丙基丙烯酰胺)(PNIPAAm)/有机交联的聚丙烯酰胺(PAAm)互穿网络(IPN)水凝胶.利用FTIR和SEM分别表征了凝胶的化学结构和内部形态；测定了凝胶在高温(50℃)时的退溶胀性能；利用DMA和DSC分别研究了凝胶的储能模量随温度的变化及热相转变行为.研究表明，该IPN凝胶具有温度敏感性；与未互穿的无机交联PNIPAAm凝胶相比，IPN凝胶具有多孔的网络结构和超快的响应速率，如10 min内失去90%的水；其储能模量增加了3～4倍，相转变行为变弱，而最低临界溶解温度(LCST)提高了1.4℃.

<title>Abstract</title> In order to effectively improve the longitudinal connection stability of prefabricated box culverts for highways, this paper proposes a new type Z-shaped assembled mortise-tenon splicing culvert highway reinforced concrete structures. Using finite element simulation software simulate, maximum deformation and stress concentration position side wall obviously appear at end armpit joint, that is, part two joints. Under same filling condition, most different mechanical...