Mechanically tough large-area hierarchical porous graphene films are fabricated by blade-casting of graphene oxide hydrogel and postcasting reduction. The as-prepared graphene films, which consist of well-exfoliated graphene nanosheets, possess interpenetrating 3D hierarchical porous structures, high strength and modulus, large specific area, and high electrical conductivity. Flexible film supercapacitors fabricated with the graphene electrodes show superior areal capacitance, good rate performance, and excellent mechanical stability.

We read great interest in the risk factors of critical or mortal COVID-19 cases, recently reported by Ye et al. in this journal. 1 Here we paid more attention about the long-term lung sequelae among survivors of severe COVID-19. With more than 21 million people worldwide recovered from COVID-19, early analysis suggested a high rate of patients had residual abnormal lung function and fibrotic remodeling on CT, especially in survivors of severe SARS-CoV-2 associated pneumonia. 2 , 3 These might contribute to longterm impairment of lung function or even lung transplants. The early identification of patients at higher risk of lung injury and fibrotic damage is critical. 4 Therefore, we performed an observational cohort study that compared fibrosis and non-fibrosis group to investigate the potential indicators for post-fibrosis. The two-center retrospective study was approved by the institutional review board of Xianning Central Hospital and Huangshi Central Hospital, both in Hubei Province. The informed consent was waived. From December 19, 2019 to March 5, 2020, a total of 430 consecutive patients with positive RT-PCR were reviewed. Finally 81 survivors who recovered from severe COVID-19 pneumonia were enrolled. The median hospitalization was 26 days; all had at least three follow-up CT scans after discharge, and the median period between the discharge and the latest CT scan was 58 days (IQR: 25-46). Pulmonary fibrosis was diagnosed based on the extensive and persistent fibrotic changes, including parenchymal bands, irregular interfaces, reticular opacities, and traction bronchiectasis with or without honeycombing on the follow-up CT scans. CT scores were evaluated by two experienced cardiothoracic radiologists independently, and quantified by the percentage of high attenuation area using thresholds with pixels between 0 and −700 HU via Chest Imaging Platform (http://chestimagingplatform.org/). Fibrosis grouping was reached by consensus. Comparative analysis were performed with R software, covering age, sex, prior medical history, signs and symptoms, laboratory data, oxygen supply, ICU admission, and treatments. The statistical difference was assessed with the unpaired, 2-tailed chisquare test for categorical variables and t-test or Mann-Whitney for continuous variables. P < 0.05 indicated a statistically significant difference.

ABSTRACT:The thermomechanical constitutive equations are critical for shape memory polymers (SMPs) in analyzing their shape, memory, and recovery responses under different constraints. In this study, a new physical-based, temperature and time-dependent constitutive model was proposed. The deformation mechanisms of this class of functional materials were explained, and the theoretical predicting values by different models were compared with available experimental results.

Great efforts have been devoted so far to combine nano-magnetic hyperthermia (NMH) and nano-photothermal therapy (NPTT) to achieve encouraging additive therapeutic performance in vitro and in vivo with limitation to direct intratumoral injection and no guidance of multimodality molecular imaging. In this study, we developed a novel multifunctional theranostic nanoplatform (MNP@PES-Cy7/2-DG) consisting of magnetic nanoparticles (MNPs), poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PES), This article is protected by copyright. All rights reserved.Cyanine7 (Cy7) and 2-Deoxyglucose-PEG (2-DG). And then we applied them for combined photo-magnetic hyperthermia therapy under intravenous administration which was simultaneously guided by tri-modality molecular imaging. Remarkably, nanoparticles were found aggregated mainly in the cytoplasm of tumor cells in vitro and in vivo, and exhibited stealth-like behavior with a long second phase blood circulation half-life of 20.38 ± 4.18 h.Under the guidance of photoacoustic/near-infrared fluorescence/magnetic resonance tri-modality imaging, tumors could be completely eliminated under intracellular photo-magnetic hyperthermia therapy with additive therapeutic effect due to precise hyperthermia. This study may promote a further exploration of such platform for clinical application.

Nanoporous laminar membranes composed of multilayered 2D nanomaterials (2D‐NLMs) are increasingly being exploited as a unique material platform for understanding solvated ion transport under nanoconfinement and exploring novel nanoionics‐related applications, such as ion sieving, energy storage and harvesting, and in other new ionic devices. Here, the fundamentals of solvation‐involved nanoionics in terms of ionic interactions and their effect on ionic transport behaviors are discussed. This is followed by a summary of key requirements for materials that are being used for solvation‐involved nanoionics research, culminating in a demonstration of unique features of 2D‐NLMs. Selected examples of using 2D‐NLMs to address the key scientific problems related to nanoconfined ion transport and storage are then presented to demonstrate their enormous potential and capabilities for nanoionics research and applications. To conclude, a personal perspective on the challenges and opportunities in this emerging field is presented.

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A new class of superhydrophobic surface based on multiple hybrid coatings is proposed and prepared to improve mechanical and reproduction stability. It does not only show a large water contact angle (ca. 174.5°) but also a slight decrease (ca. 6.4%) of water contact angle after 100 mechanical abrasion cycles. Furthermore, the water contact angle changes slightly (relative standard deviation, 0.14%) for the three superhydrophobic surfaces prepared with the same procedure. The application of superhydrophobic multiple hybrid coatings in corrosion protection is further investigated by the Tafel polarization curves and electrochemical impedance spectroscopy. The superhydrophobic multiple hybrid coatings showed lower corrosion current (1.4 × 10–11 A/cm2), lower corrosion rate (ca. 1.6 × 10–7 mm/year), and larger polarization resistance (7.9 × 104 MΩ cm2) in 3.5 wt % NaCl aqueous solution compared to other superhydrophobic coatings reported in previous works. This work not only confirms the formation of robust superhydrophobic surface for real application in corrosion protection but also provides a new model of superhydrophobic surface based on multiple hybrid coatings with high mechanical, chemical, and reproduction stability for various applications.

Photo-cross-linkable multilayer films composed of sulfonated reduced graphene oxide (SRGO) and polystyrene-based diazonium salt (PSDAS) were fabricated by electrostatic layer-by-layer (LbL) self-assembly. Polystyrene with narrow molecular weight distribution was synthesized by atom transfer radical polymerization (ATRP), and cationic PSDAS was prepared through nitration, reduction, and diazotization reactions. Negatively charged SRGO nanosheets were prepared through prereduced by NaBH4, modified by diazonium salt of sulfanilic acid, and then further reduced by hydrazine. The multilayer films were obtained by alternately dipping substrates in the PSDAS solution and SRGO dispersion in acidic conditions. The cross-linking between the components occurred during the multilayer formation process and was further achieved by the UV light irradiation after the film preparation. The assembling process and surface morphology of LbL multilayer films were monitored by UV-vis spectroscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM). The cross-linking between SRGO and PSDAS was verified by attenuated total reflectance FTIR (ATR-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle measurement. The graphene nanosheets were found to be homogeneously distributed in the cross-linked network of the films. The large accessible surface area of graphene nanosheets and the cross-linking structure afforded the LbL films with high specific capacitance and excellent cyclic stability when used as supercapacitor electrodes. At a sweeping rate of 10 mV/s, the film with nine bilayers exhibited a specific capacitance of 150.4 F/g with ideal rectangular cyclic voltammogram. Large capacitance retention of 97% was observed after 10 000 charge-discharge cycles under the scanning rate of 1000 mV/s. This new approach for preparing graphene-containing multilayer films can be used to develop supercapacitor electrodes and other functional devices.