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The Fenton method to remediate oil-contaminated soils has long suffered from low utilization of ·OH, resulting in waste of costs during practical application. This study investigated the efficient utilization of ·OH in oxidation using three different soils contaminated with oil (S1, S2, and S3). The mechanisms of promoting oxidation of long-chain alkanes by self-produced surfactant-like substance at the solid-liquid interface were studied. These results (take S1 as an example) showed that the average ·OH utilization rate of oxidized long-chain alkanes ( K a ) at the solid-liquid interface reached 88.34 (mg/kg∙(a.u.)), which was higher than the non-solid-liquid interface stage (I: 54.02 (mg/kg∙(a.u.)), II: 67.36 (mg/kg∙(a.u.))). Meanwhile, the average oxidation of long-chain alkanes could increase unit ·OH intensity added ( K b ) in the solid-liquid interface (990.00 mg/kg), which was much higher than K b of the non-solid-liquid interface stage (I: 228.34 mg/kg, II: −1.48 mg/kg). Furthermore, there was a significant correlation between the proportion of humic acid-like in soil organic matter and the oxidation of long-chain alkanes at the solid-liquid interface. Thus, the surfactant-like substance generated during oxidation promoted the oxidation of long-chain alkanes at the solid-liquid interface. Moreover, when the surfactant-like substance had a matching degree ( φ ) with the long-chain alkanes (S1 0.18, S2 0.15, and S3 0.25), the efficiency of the ·OH utilization reached the peak, and the direct oxidation of long-chain alkanes at the solid-liquid interface was finally achieved (S1: 1373.00 mg/kg, S2: 1473.18 mg/kg, and S3: 1034.37 mg/kg). The appropriate surfactant-like substance agents in the construction can reduce the dosing of H 2 O 2 and the construction costs by improving the efficient utilization of ·OH. Graphical Abstract Study on the mechanism promoting oxidation of long-chain alkanes by self-produced surfactant-like substance at the solid-liquid interface.

Heterogeneous Fenton system has been widely used in water treatment because of its effective degradability in a wide range of pH. A two-step hydrothermal method for the synthesis of Fe3O4/reduced graphene oxide (RGO) aerogel was designed as an efficient and recyclable heterogeneous Fenton catalyst for degradation of methylene blue (MB). Firstly, the Fe3O4 colloidal solution was synthesized by hydrothermal progress. Secondly, graphene oxide hydrogels were formed by the self-assembling and reduced to graphene during the hydrothermal reaction. Meanwhile, zero-dimensional Fe3O4 nanoparticles were anchored onto the graphene oxide through the colloidal coagulation effect. The obtained samples were characterized by XRD, SEM, TEM, BET, Zeta, XPS, Raman, TG, and VSM. Adsorption isotherm and kinetics of MB onto Fe3O4/RGO composites revealed that the maximum adsorption capacity was 163.83 mg/g, and the adsorption process confirmed to the pseudo-second-order model. The determinants of heterogeneous Fenton system including oxidant concentration, initial pH, and reaction mechanism were investigated. The studies indicated that MB degradation efficiencies increased with the initial pH increasing (pH 3–10), showing a complete degradation in alkaline condition within 60 min. It is due to that catalytic reaction mainly occurs on the solid–liquid interface, as pH values increase, the electrostatic attraction between the cationic MB molecules and the surface of Fe3O4/RGO increases, the enhancement of adsorptivity is helpful to improve catalytic activity. The catalyst can be easily recovered by an applied magnetic field and exhibited excellent stability after five degradation cycles.

Lysozyme (LYZ) is a small cationic protein which is widely used for medical treatment and in the food industry to act as an anti-bacterial agent; however, it can trigger allergic reactions. In this study, high-affinity molecularly imprinted nanoparticles (nanoMIPs) were synthesized for LYZ using a solid-phase approach. The produced nanoMIPs were electrografted to screen-printed electrodes (SPEs), disposable electrodes with high commercial potential, to enable electrochemical and thermal sensing. Electrochemical impedance spectroscopy (EIS) facilitated fast measurement (5–10 min) and is able to determine trace levels of LYZ (pM) and can discriminate between LYZ and structurally similar proteins (bovine serum albumin, troponin-I). In tandem, thermal analysis was conducted with the heat transfer method (HTM), which is based on monitoring the heat transfer resistance at the solid–liquid interface of the functionalized SPE. HTM as detection technique guaranteed trace-level (fM) detection of LYZ but needed longer analysis time compared to EIS measurement (30 min vs 5–10 min). Considering the versatility of the nanoMIPs which can be adapted to virtually any target of interest, these low-cost point-of-care sensors hold great potential to improve food safety. Graphical Abstract

Friction is a fundamental force that impacts almost all interface-related applications. Over the past decade, there is a revival in our basic understanding and practical applications of the friction. In this review, we discuss the recent progress on solid-liquid interfacial friction from the perspective of interfaces. We first discuss the fundamentals and theoretical evolution of solid-liquid interfacial friction based on both bulk interactions and molecular interactions. Then, we summarize the interfacial friction regulation strategies manifested in both natural surfaces and artificial systems, focusing on how liquid, solid, gas, and hydrodynamic coupling actions mediate interfacial friction. Next, we discuss some practical applications that are inhibited or reinforced by interfacial friction. At last, we present the challenges to further understand and regulate interfacial friction.

The use of the principle of maximum entropy generation per unit volume is a new approach in materials science that has implications for understanding the morphological evolution during solid–liquid interface growth, including bifurcations with or without diffuseness. A review based on a pre-publication arXiv preprint is first presented. A detailed comparison with experimental observations indicates that the Maximum Entropy Production Rate-density model (MEPR) can correctly predict bifurcations for dilute alloys during solidification. The model predicts a critical diffuseness of the interface at which a plane-front or any other form of diffuse interface will become unstable. A further confidence test for the model is offered in this article by comparing the predicted liquid diffusion coefficients to those obtained experimentally. A comparison of the experimentally determined solute diffusion constant in dilute binary Pb–Sn alloys with those predicted by the various solidification instability models (1953–2011) is additionally discussed. A good predictability is noted for the MEPR model when the interface diffuseness is small. In comparison, the more traditional interface break-down models have low predictiveness.

A Cu coating was introduced on the steel surface by electroplating, and the wetting and spreading behavior of Mg alloys on Cu-coated steel substrates during the laser machining process was investigated. Wetting behavior, microstructure, diffusion kinetics, and thermodynamic calculations were conducted to comprehend the role of the Cu coating in the wetting process. The contact angle decreases first followed by an increase with the increased Cu coating thickness. The interfacial reaction is enhanced by the combination of Mg atoms with Fe atoms, transitioning the primary wetting mechanism from reaction control to adsorption/desorption processes. The introduction of Cu elements promoted the creation of a loosely structured Mg + Mg 2 Cu phase at the solid–liquid interface between Mg and steel. It significantly increased the wetting of Mg droplets on the steel surface. The results showed that the wetting behavior in this material system was synergistically governed by reactions, surface energy, and thermodynamic driving forces. These findings provided a foundational understanding for enhancing the joining of dissimilar Mg/steel materials under non-isothermal processing conditions.

To study an effective removal method of residual cephalosporin antibiotics in water, taking the ceftriaxone sodium (CFS) as a research object, the adsorption effects of the resins with different characteristic parameters for CFS were investigated in the pH range of 2.0–5.0. MTS9570, a sorbent containing sulfonic-phosphoric acid bi-functional group, was optimally selected and further to study the adsorption removal behavior to CFS in depth for the first time. Owning to the highest fitness of the pseudo-second-order and intra-particle diffusion (R2 > 0.99), two models can better describe the process of CFS onto MTS9570, indicating that the process is controlled by the chemi-sorption and intra-particle diffusion together. Compared with Freundlich and Temkin isotherm, Langmuir isotherm is the best fitness with highest R2 and lowest AIC values, indicating that there exists a monolayer adsorption on the surface of MTS9570 sorbent to CFS. ∆H < 0, ∆S > 0 and ∆G < 0, imply that the adsorption is an exothermic spontaneous process with increased randomness at the solid–liquid interface. The adsorption ability of MTS9570 after six adsorption–desorption cycles can still reach 90.13% of the initial adsorption capacity, indicating that the adsorbent has good reusability. Combining the above results with the bi-functional group of the adsorbent as well as the molecular structure of CFS, we speculate that the potential adsorption mechanism of MTS9570 to CFS may be mainly controlled by electrostatic interaction and supplemented by hydrogen bonding.

In this research, activated carbon was prepared from terrestrial moss and utilized as a low-cost adsorbent to remove hexavalent chromium [Cr(VI)] from aqueous solution. The study examined important biosorption factors including initial pH (1–3), contact time (0.5–24 h), initial Cr(VI) concentration (20–400 mg/L), and biosorbent dosage (0.05–0.4 g) to assess their impact on the efficiency of modified terrestrial moss (MAC) in eliminating Cr(VI) from water. The biosorbent capacity was evaluated using different kinetic models and isotherms. The highest removal efficiency of Cr(VI) onto MAC was ascertained as 97.8% at an initial solution pH of 1, MAC dose of 0.2 g, initial Cr(VI) concentration of 50 mg. L−1, and contact time of 15 h. The FTIR analysis revealed the interactions of certain functional groups in the adsorption of chromium ions. The biosorption occurred through the anionic adsorption mechanism and followed the pseudo-second order kinetic model. The experimental data was best fitted with Freundlich isotherm. Furthermore, the thermodynamic studies suggest that the biosorption process is both spontaneous and exothermic. The positive entropy change implied the randomness at the solid–liquid interface. In light of these compelling results, the study recommends the consideration of MAC as an efficient and practical solution for the removal of Cr (VI) from aqueous environments.

Integrating nanomaterials into the polymer matrix is an effective strategy to optimize the performance of polymer‐based piezoelectric devices. Nevertheless, the trade‐off between the output enhancement and stability maintenance of piezoelectric composites usually leads to an unsatisfied overall performance for the high‐strength operation of devices. Here, by setting liquid metal (LM) nanodroplets as the nanofillers in a poly(vinylidene difluoride) (PVDF) matrix, the as‐formed liquid‐solid/conductive‐dielectric interfaces significantly promote the piezoelectric output and the reliability of this piezoelectric composite. A giant performance improvement featured is obtained with, nearly 1000% boosting on the output voltage (as high as 212 V), 270% increment on the piezoelectric coefficient (d33∼51.1 pC N−1) and long‐term reliability on both structure and output (over 36 000 cycles). The design of a novel heterogenous interface with both mechanical matching and electric coupling can be the new orientation for developing high performance piezoelectric composite‐based devices. Liquid metal nanodroplets are introduced into P(VDF‐TrFE) matrix to construct a liquid‐solid piezoelectric nanocomposite. The optimized liquid metal‐PVDF nanocomposites with polar β‐phase content of 81.5% demonstrate an impressive piezoelectric coefficient (d33∼51.1 pC/N) and maximum output voltage of ≈212 V. The flexible device presented long‐term stability and realized the self‐powered monitoring and smart analysis of human limbs and facial movements.

The effect of Ni in Ag–Cu filler on the wetting and brazing characterization of stainless steel was studied by means of wetting test and brazing test under high vacuum condition. The wettability of filler metal and the joint strength were improved after adding Ni in Ag–Cu filler. The filler penetrates into stainless steel and the topmost steel grains separate from the substrate, exposing the metal surface without oxide film after adding Ni, which leads to the reduction in contact angle. The interdiffusion between FM and SS is enhanced after adding Ni, which leads to further reduction in contact angle. At wetting temperature, large amount of Ni in liquid enriched at solid–liquid interface, increasing the Cu content in liquid near the interface to form Cu-rich liquid, which caused the penetration of liquid filler. Cu first penetrates into steel grain boundary, which provides a path for Ni diffusion into stainless steel. After the oxide film was removed, a large number of Ni directly diffused into stainless steel to form ( γ -Fe, Ni) layer on stainless steel surface. Cu in liquid can directly diffuse into ( γ -Fe, Ni). Stainless steel can dissolve in Cu-rich liquid with high Ni content. In the absence of Ni, FM/SS interface is the weakest location of the joint. After adding Ni in filler, the formation of Cu solid solution at FM/SS interface and the enhancement of interdiffusion between FM and SS strengthen the FM/SS interface, leading to the increase in joint strength. The results in this paper suggest Ni is beneficial for brazing stainless steel by Ag–Cu alloy.