Highly Sensitive Piezo-Resistive Graphite Nanoplatelet–Carbon Nanotube Hybrids/Polydimethylsilicone Composites with Improved Conductive Network Construction

The constructions of internal conductive network are dependent on microstructures of conductive fillers, determining various electrical performances of composites. Here, we present the advanced graphite nanoplatelet–carbon nanotube hybrids/polydimethylsilicone (GCHs/PDMS) composites with high piezo-resistive performance. GCH particles were synthesized by the catalyst chemical vapor deposition approach. The synthesized GCHs can be well dispersed in the matrix through the mechanical blending process. Due to the exfoliated GNP and aligned CNTs coupling structure, the flexible composite shows an ultralow percolation threshold (0.64 vol %) and high piezo-resistive sensitivity (gauge factor ∼ 10³ and pressure sensitivity ∼ 0.6 kPa^–1). Slight motions of finger can be detected and distinguished accurately using the composite film as a typical wearable sensor. These results indicate that designing the internal conductive network could be a reasonable strategy to improve the piezo-resistive performance of composites

Guanosine-Based Supramolecular Hydrogels with Dynamic Time-Dependent Fluorescence for Information Encryption

Dynamic time-dependent fluorescent encrypted hydrogels provide a highly secure and sophisticated information security strategy. However, challenges still remain in developing new green encrypted hydrogels with simple preparation. Herein, a new series of guanosine (G)-based supramolecular hydrogels with dynamic time-dependent fluorescence rather than traditional fluorescent materials are exquisitely constructed via a one-pot reaction for the first time. Typically, their fluorescence intensity and wavelength can gradually change with the time dimension of more than 1 year, showing promising potential in information encryption–decryption–destruction. A detailed timescale structure characterization combined with the transition-state analysis of the self-assembly process revealed that the G-quartet-based self-assembly in hydrogels has significant endogenous dynamics, which further affects gelation and time-dependent fluorescence through the self-assembly rate. Further combined with the excellent shear thinning, self-healing, and metal ion response properties, the writing, storage, reading, and ″burning after reading″ of information can be successfully realized in a long-term dimension. Therefore, this study illustrates that the ingenious use of functional supramolecular self-assembly building blocks will be a useful strategy for the development of dynamic time-dependent fluorescent encrypted hydrogels

Multiple stepwise regression results.

BackgroundSubjective well-being has a significant impact on an individual’s physical and mental health. Socioeconomic status, class identity, and social activity participation play important roles in subjective well-being. Therefore, the aim of this study was to uncover the mechanisms through which these factors influence subjective well-being.MethodsA total of 1926 valid samples were recruited using the Chinese General Social Survey 2021 (CGSS 2021). The Chinese Citizen’s Subjective Well-Being Scale (SWBS-CC) was employed to assess subjective well-being. Socioeconomic status was measured using income and education, and class identity and social activity participation were measured using Likert scales. Pearson correlation analysis and the chain mediation model were conducted to explore the relationship between these factors. Finally, the Bootstrap method was used to examine the path coefficients.ResultsA significant correlation was found between socioeconomic status, class identity, social activity, and subjective well-being (p ConclusionsThe study showed that socioeconomic status, class identity, and social activity had significant effects on subjective well-being. Class identity and social activity partially mediated the effects of socioeconomic status on subjective well-being, and they had a chain mediating effect between socioeconomic status and subjective well-being. Therefore, policymakers have the opportunity to enhance subjective well-being in lower socioeconomic status groups by promoting individual class identity and encouraging greater social activity participation.</div

Bootstrap test results for multiple intermediary models.

Bootstrap test results for multiple intermediary models.</p

The conceptual model based on previous research and theory.

The conceptual model based on previous research and theory.</p

The results of Pearson correlation analysis.

BackgroundSubjective well-being has a significant impact on an individual’s physical and mental health. Socioeconomic status, class identity, and social activity participation play important roles in subjective well-being. Therefore, the aim of this study was to uncover the mechanisms through which these factors influence subjective well-being.MethodsA total of 1926 valid samples were recruited using the Chinese General Social Survey 2021 (CGSS 2021). The Chinese Citizen’s Subjective Well-Being Scale (SWBS-CC) was employed to assess subjective well-being. Socioeconomic status was measured using income and education, and class identity and social activity participation were measured using Likert scales. Pearson correlation analysis and the chain mediation model were conducted to explore the relationship between these factors. Finally, the Bootstrap method was used to examine the path coefficients.ResultsA significant correlation was found between socioeconomic status, class identity, social activity, and subjective well-being (p ConclusionsThe study showed that socioeconomic status, class identity, and social activity had significant effects on subjective well-being. Class identity and social activity partially mediated the effects of socioeconomic status on subjective well-being, and they had a chain mediating effect between socioeconomic status and subjective well-being. Therefore, policymakers have the opportunity to enhance subjective well-being in lower socioeconomic status groups by promoting individual class identity and encouraging greater social activity participation.</div

Guanosine-Based Supramolecular Hydrogels with Dynamic Time-Dependent Fluorescence for Information Encryption

Dynamic time-dependent fluorescent encrypted hydrogels provide a highly secure and sophisticated information security strategy. However, challenges still remain in developing new green encrypted hydrogels with simple preparation. Herein, a new series of guanosine (G)-based supramolecular hydrogels with dynamic time-dependent fluorescence rather than traditional fluorescent materials are exquisitely constructed via a one-pot reaction for the first time. Typically, their fluorescence intensity and wavelength can gradually change with the time dimension of more than 1 year, showing promising potential in information encryption–decryption–destruction. A detailed timescale structure characterization combined with the transition-state analysis of the self-assembly process revealed that the G-quartet-based self-assembly in hydrogels has significant endogenous dynamics, which further affects gelation and time-dependent fluorescence through the self-assembly rate. Further combined with the excellent shear thinning, self-healing, and metal ion response properties, the writing, storage, reading, and ″burning after reading″ of information can be successfully realized in a long-term dimension. Therefore, this study illustrates that the ingenious use of functional supramolecular self-assembly building blocks will be a useful strategy for the development of dynamic time-dependent fluorescent encrypted hydrogels

Enhanced X‑Band Electromagnetic-Interference Shielding Performance of Layer-Structured Fabric-Supported Polyaniline/Cobalt–Nickel Coatings

Despite tremendous efforts, fabrication of lightweight conductive fabrics for high-performance X-band electromagnetic-interference (EMI) shielding remains a daunting technical challenge. We herein report an ingenious and efficient strategy to deposit polyaniline/cobalt–nickel (PANI/Co–Ni) coatings onto lyocell fabrics that involves consecutive steps of in situ polymerization and electroless plating. The PANI–Co−Ni ternary-component system successfully induced a synergistic effect from EM wave-absorption and EM wave-reflection and, moreover, upgraded the match level between magnetic loss and dielectric loss. By the judicious control of polymerization cycles and plating time, low-weight fabric-supported PANI/Co–Ni composites (with PANI and Co–Ni loading of 2.86 and 3.99 mg·cm^–2, respectively) were prepared, which displayed relatively high EMI shielding effectiveness (SE) (33.95–46.22 dB) when compared to their single peers (PANI-coated fabric and Co–Ni-coated fabric) or even the sum of them. Inspired by the so-called “1 + 1 > 2” phenomenon, here we demonstrated that there was an EMI SE enhancement effect in this conductive polymer/metal system that may be associated with interphase chemical and/or physical interactions. Further analysis revealed that this EMI SE enhancement effect was evident under circumstances of relatively low metal content and became weak with the increase of metal content. The mechanisms involved were interpreted through a series of fundamental measurements, including Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and vector network analysis (VNA). The linkage between PANI and Co–Ni coatings was in the form of Co–N/Ni–N, which mimics the atomic configuration occurring in cobalt porphyrins. The Co–N/Ni–N configuration strengthened the interphase adhesion and thus resulted in shielding fabrics with high durability for practical applications

Cycling of Rational Hybridization Chain Reaction To Enable Enzyme-Free DNA-Based Clinical Diagnosis

In order to combat the growing threat of global infectious diseases, there is a need for rapid diagnostic technologies that are sensitive and that can provide species specific information (as might be needed to direct therapy as resistant strains of microbes emerge). Here, we present a convenient, enzyme-free amplification mechanism for a rational hybridization chain reaction, which is implemented in a simple format for isothermal amplification and sensing, applied to the DNA-based diagnosis of hepatitis B virus (HBV) in 54 patients. During the cycled amplification process, DNA monomers self-assemble in an organized and controllable way only when a specific target HBV sequence is present. This mechanism is confirmed using super-resolution stochastic optical reconstruction microscopy. The enabled format is designed in a manner analogous to an enzyme-linked immunosorbent assay, generating colored products with distinct tonality and with a limit of detection of ca. five copies/reaction. This routine assay also showed excellent sensitivity (>97%) in clinical samples demonstrating the potential of this convenient, low cost, enzyme-free method for use in low resource settings

Cycling of Rational Hybridization Chain Reaction To Enable Enzyme-Free DNA-Based Clinical Diagnosis

In order to combat the growing threat of global infectious diseases, there is a need for rapid diagnostic technologies that are sensitive and that can provide species specific information (as might be needed to direct therapy as resistant strains of microbes emerge). Here, we present a convenient, enzyme-free amplification mechanism for a rational hybridization chain reaction, which is implemented in a simple format for isothermal amplification and sensing, applied to the DNA-based diagnosis of hepatitis B virus (HBV) in 54 patients. During the cycled amplification process, DNA monomers self-assemble in an organized and controllable way only when a specific target HBV sequence is present. This mechanism is confirmed using super-resolution stochastic optical reconstruction microscopy. The enabled format is designed in a manner analogous to an enzyme-linked immunosorbent assay, generating colored products with distinct tonality and with a limit of detection of ca. five copies/reaction. This routine assay also showed excellent sensitivity (>97%) in clinical samples demonstrating the potential of this convenient, low cost, enzyme-free method for use in low resource settings