Environmental Science-Nano
·
2023
·Vol. 10
·期 11
·3072-3083
·
IF 7.3
Chuanqi Pan,Biluan Zhang,Tingyu Pan,Hui Huang,Siyi Song,Xitong Cai,Yuhang Wang,Hongwei Sun,Zhu Luo,Lizhi Zhang,Yanbing Guo
The dual activation mechanism of molecular oxygen (O2) and water (H2O) in the local structure of catalysts has not been elucidated yet. Herein, we report a strategy for manufacturing fully exposed Ag4 sites in nano silver/graphdiyne (Ag/GDY) composites for activating O2 and H2O. The synthesized nano Ag was uniformly anchored on the surface of GDY without any surfactant added, with an average particle size of 2.5 nm. The unique sp-hybrid C and triangular pore structure of GDY not only regulate the stable geometric structure of nano Ag, but also enhance the adsorption ability of Ag4 sites for O2 and H2O molecules in nano Ag/GDY. Electron spin resonance spectroscopy and density functional theory calculation results proved that O2 is more favorable to synergistically promote the activation of H2O to generate reactive ·O2− and ·OH radicals on the nano Ag/GDY surfaces, leading to outstanding antibacterial activity. This work provides a simple strategy for the preparation of stable nano Ag and proposes to improve the catalytic oxidation activity by adjusting the local electronic structure of catalysts to activate O2 and H2O.
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Nano Energy
·
2023
·
IF 17.6
Ya Cheng,Jing Wang,Xiaofeng Lu,Ce Wang
Due to the increased demand for health monitoring and disease alarm, the self-powered epidermal electric sensors have attracted extensive attention, such as triboelectric nanogenerator (TENG)-based electric skin (e-skin). However, the humidity accumulation at the interface between e-skin and skin will threaten the stability and reliability of the monitoring signals. Moisture absorptivity and perspiration are still great challenges that need to be addressed. Here, inspired by the internal structure of plants used to transport water, we fabricated an all-nanofiber Janus textile via a continuous electrospinning/electrospray technology, presenting a double gradient variations in the pore size and wettability along the thickness direction. Janus textile was constructed from the hydrolyzed polyacrylonitrile (HPAN)/hexagonal boron nitride nanosheets (BNNS) fibrous membrane with small pores and hydrophilicity , conducting Ag nanowire (NW)layer, and polyurethane (TPU) nanofibrous membrane with large pores and hydrophobicity . By utilizing the wicking effect of external HPAN/BNNS layer, the sweat droplet could be transported from the interface between the skin and Janus textile to the external environment, meanwhile, the returned sweat will be blocked by interior TPU layer to keep the dry state of the skin. Therefore, the directional moisture transportation was realized. As the near-skin side, TPU was used as the other triboelectric layer, the optimal triboelectrification output reached 78.10 V, 0.16 μA, and 3.31 W m −2 . Moreover, the damped Janus textile also exhibited an open-circuit voltage of 30 V, a short-circuit current of 0.051 μA, and a power density of 0.14 W m −2 . With the assistance of an adhesive layer , Janus textile e-skin could easily adhere to the skin surface, generating stable movement and physiological sensing signals. In short, this work presents a noval way to construct Janus e-skin patch with directional sweating and breathability for monitoring long-term real-physiological signals.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Abubakar Yakubu Haruna,Yubo Luo,Zheng Ma,Wang Li,Haiqiang Liu,Xin Li,Qinghui Jiang,Junyou Yang
The thermoelectric performance of n-type Bi2Te3 needs further enhancement to match that of its p-type Bi2Te3 counterpart and should be considered for competitive applications. Combining Cu/Cl and multiscale additives (AgBiSe2) presents a suitable route for such enhancement. This is evidence of the enhanced thermoelectric performance of Bi1.995Cu0.005Te2.69Se0.33Cl0.03. Moreover, by incorporating 0.65 wt % AgBiSe2 (ABS) into Bi1.995Cu0.005Te2.69Se0.33Cl0.03, we further reduce its lattice thermal conductivity to ∼0.28 W m–1 K–1 at 353 K owing to the extra phonon scattering of multiscale ABS. Additionally, the Seebeck coefficient enhances (−183.89 μV K–1 at 353 K) owing to the matrix’s reduced carrier concentration caused by ABS. As a result, we achieve a high ZT of ∼1.25 (at 353 K) and a high ZTave of ∼1.12 at 300–433 K for Bi1.995Cu0.005Te2.69Se0.33Cl0.03 + 0.65 wt % ABS. This work provides a promising strategy for enhancing the thermoelectric performance of n-type Bi2Te3 through Cu/Cl doping and ABS incorporation.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-20
·
IF 26.6
He Hualing,Qin Yi,Zhu Zhenyu,Jiang Qing,Ouyang Shengnan,Wan Yuhang,Qu Xueru,Xu Jie,Yu Zhicai
The p – n segment thermoelectric aerogel fiber was fabricated through an alternating coaxial wet-spinning strategy.
Resultant alternating p – n segment thermoelectric fiber was electrically connected in series (two p – n pairs with a length of 3 cm) with an outstanding electrical conductivity of 23.76 S m −1 .
Thermoelectric textile-based self-powered fire warning electronics exhibited sensitivity (trigger time within 1.43 s) and repeatable temperature sensing performance for firefighting clothing.
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Nano Energy
·
2023
·
IF 17.6
Xingyi Dai,Qihua Liang,Zi-Han Zhao,Yinghui Wu,Jingkun Yang,Jiaxin Han,Yajun Cao,Yiping Wang,Cheng-Hui Li,Aihua Zhong,Long-Biao Huang
With the advancements in electronic skins (E-skins) and communication technologies, the applicability of sensors in extreme environments poses significant challenges. While various sensors have been reported, maintaining electrical output performance without external power source and self-healing capability across multiple extreme environments remains a hurdle. Herein, we present flexible, self-healing, and harsh environment-resistant self-powered sensors for E-skins, the self-healing capabilities of which are virtually invulnerable in diverse extreme environments, including underwater, saline, oxidized, alkali, and acid conditions, as well as low and high temperatures. The self-powered sensors are composed of self-healing polyurea (SH-PUrea) and Ag nanowires (AgNWs). Since physical entanglements that are less susceptible to environmental influences are introduced in SH-PUrea, the self-powered sensors exhibit exceptional self-healing performance without degradation of the output signals, regardless of the ambient conditions or extreme environments encountered. Specifically designed in a 3 × 3 pixel array structure, the self-powered sensors are ideal for E-skins that can adapt to sweaty and underwater environments. The detection of pressure position and underwater communication can be achieved by analyzing the electrical signals from the sensor array. This work introduces a novel strategy for enhancing the extreme environment-resistance and durability of flexible devices.
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DESALINATION
·
2023
·
IF 9.9
Chuqing Cao,Fengnan Liu,Fangqing Li,Onyeagoro Robinson Uzochukwu,Lin Chen
Membrane distillation (MD) is a promising desalination technology that combines traditional distillation processes with membrane separation technology , but when the feed solution contains amphiphilic substances such as surfactant, the hydrophobic membrane is prone to being wetting, which hinders its widespread application. In this study, a novel Janus membrane was developed by embedding Zr-MOF and silver nanowires into the modified graphene oxide composite membrane to improve its separation performance, and the effect of high-concentration SDS on the membrane performance was studied. The experimental results showed that the conductive membrane exhibited excellent performance when powered on for 5 min every 2.5 h under 2 V voltage. The flux stabilized at 19.6 L/(m 2 h) with a desalination rate up to 99.9 % and no obvious signs of membrane wetting. It was found that the effect of electric field caused a negative charge on the membrane surface , forming a charge repulsion force with the SDS. Simultaneously, intermittent electrical flotation can effectively remove SDS that has accumulated on the membrane surface, thus achieving efficient and stable operation of MD system. Moreover, a machine learning approach with Catboost was applied to predict and unveil the complex effects on membrane performance, providing a deep insight to treat wastewater containing surfactant.
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Advanced Science
·
2023
·Vol. 10
·期 28
·2302976
·
IF 15.1
Jianhua Xiao,Yang Wang,Liu Yuan,Yin Long,Zhi Jiang,Qingxia Liu,Deen Gu,Weizhi Li,Huiling Tai,Yadong Jiang
The recent emergence of non-fullerene acceptors (NFAs) has energized the field of organic photodiodes (OPDs) and made major breakthroughs in their critical photoelectric characteristics. Yet, stabilizing inverted NF-OPDs remains challenging because of the intrinsic degradation induced by improper interfaces. Herein, a tin ion-chelated polyethyleneimine ethoxylated (denoted as PEIE-Sn) is proposed as a generic cathode interfacial layer (CIL) of NF-OPDs. The chelation between tin ions and nitrogen/oxygen atoms in PEIE-Sn contributes to the interface compatibility with efficient NFAs. The PEIE-Sn can effectively endow the devices with optimized cascade alignment and reduced interface defects. Consequently, the PEIE-Sn-OPD exhibits properties of anti-environmental interference, suppressed dark current, and accelerated interfacial electron extraction and transmission. As a result, the unencapsulated PEIE-Sn-OPD delivers high specific detection and fast response speed and shows only slight attenuation in photoelectric performance after exposure to air, light, and heat. Its superior performance outperforms the incumbent typical counterparts (ZnO, SnO 2 , and PEIE as the CILs) from metrics of both stability and photoelectric characteristics. This finding suggests a promising strategy for stabilizing NF-OPDs by designing appropriate interface layers.
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Materials Today Physics
·
2023
·
IF 11.5
Wen-Fa Chen,Xiao-Ming Jiang,Bin-Wen Liu,Guo-Cong Guo
Infrared (IR) nonlinear optical (NLO) material with a concurrently wide band gap and significant NLO coefficient in a single crystal is an incompatible but addressable challenge. Hence, for the first time, the AgGaS 2 structure evolved into an Ag-based sulfide system integrating dual s -block elements, guiding the discovery of two NLO crystals named AMgAgGa 6 S 11 (A = K, 1 ; Rb, 2 ). Structurally, title phases possess a novel NLO functional motif [AgGa 6 S 17 ] assembled by two C 2 -type supertetrahedra through a shared [AgS 4 ] tetrahedron, in which the electropositive cations A + and Mg 2+ are embedded. Thus, compounds 1 and 2 display emulative band gaps (3.15 and 3.25 eV, exceeding that of 2.65 eV in AgGaS 2 ) toward optimizing the laser-induced damage thresholds (3.1 and 3.2 × AgGaS 2 @1064 nm). Remarkably, the noncentrosymmetric phases 1 and 2 exhibit moderate second-harmonic generation (SHG) responses (0.6 and 0.7 × AgGaS 2 @1910 nm), the greater-than-commercial half of the AgGaS 2 . To the best of our current knowledge, an experimental birefringence of 1 and 2 (0.029 and 0.027, @546 nm) is first observed in quinary ordered chalcogenides , indicating that samples 1 and 2 meet phase-matching conditions at the incident laser of 1910 nm. All these observations demonstrate that crystals 1 and 2 can become prospective NLO materials. This research will pave the way for discovering excellent IR NLO crystals with wide band gaps and impressive NLO coefficients by incorporating multiple strong electropositive elements into chalcogenides .
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Advanced Healthcare Materials
·
2023
·Vol. 12
·期 24
·2202707
·
IF 10
Kai Li,Yuting Zhu,Qiang Zhang,Yahong Shi,Tun Yan,Xi Lu,Huizhen Sun,Tingting Li,Zhongxian Li,Xiaoli Shi,Dong Han
Injectable hydrogels have been extensively used in tissue engineering where high mechanical properties are key for their functionality at sites of high physiological stress. In this study, an injectable, conductive hydrogel is developed exhibiting remarkable mechanical strength that can withstand a pressure of 500 kPa (85% deformation rate) and display good fatigue resistance, electrical conductivity, and tissue adhesion. A stable covalent cross-linked network with a slip-ring structure by threading amino β -cyclodextrin is formed onto the chain of a four-armed (polyethylene glycol) amino group, and then reacted with the four-armed (polyethylene glycol) maleimide under physiological conditions. The addition of silver nanowires enhances the hydrogel's electrical conductivity, enabling it to act as a good conductor in vivo. The hydrogel is injected into the fascial space, and the results show that the weight and muscle tone of the atrophied gastrocnemius muscle improve, subsequently alleviating muscle atrophy. Overall, this study provides a simple method for the preparation of a conductive hydrogel with high mechanical properties. In addition, the interstitial injection provides a strategy for the use of hydrogels in vivo.
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VACUUM
·
2023
·
IF 4
Luobin Zhang,Jintao Wang,Sheng Zhou,Xiaojia Luo,Yufeng Li
This research is an attempt to apply the silver thick-film metallization and the soft soldering process to the ultra-high vacuum packaging of atom chips with through silicon via (TSV). During the packaging process, a vacuum environment is used to avoid oxidation of the Cu layer on the chip during heating. At the same time, tin foil is used to protect the inner wall of the glass cell to prevent the gas emitted by the solder from polluting the inner wall. In general, by the adoption of screen printing, sintered surface metallization at a constant temperature of 450–500 °C for 5 min, combined with soft soldering, the packaging of an atom chip with TSV and a silica glass cell is realized. The weld gap is less than 50 μm, the airtightness can reach 8.5 × 10 −13 Pa m 3 /s, and the vacuum degree can reach 2.18 × 10 −8 Pa. That can meet the requirements of cold atom experiment for light path and vacuum degree.
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Joule
·
2023
·
IF 39.8
Tiancheng He,Haiyan Wang,Bing Lu,Tianlei Guang,Ce Yang,Yaxin Huang,Huhu Cheng,Liangti Qu
Ubiquitous moisture is of particular attraction for sustainable power generation. However, rigorous assembly procedures limit the efficient large-scale integration for moisture-enabled electric generators (MEGs). Herein, we develop fully printed planar MEG (PMEG) arrays using modulated polycation and polyanion inks, which maximize access to moisture and make it free of strict assembly and device packaging. Thus, a PMEG unit (only 0.3 cm 2 ) generates an open-circuit voltage of up to 1.1 V, along with a power density of 2.6 μW cm −2 . A small piece of sheet with 200 PMEG units offers a maximum voltage of 200 V and a current of 1.3 mA. A standard power module is constructed to meet the on-demand power supply requirements of compact electronics. Furthermore, scalable and customizable PMEG arrays can be compatibly integrated with flexible circuits, as demonstrated by a fully printed self-powered functional system including PMEG arrays and energy-storage and electrochromic devices.
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JOURNAL OF DENTISTRY
·
2023
·
IF 4.4
Tiantian Guo,Mengyu Yang,Dai Wang,Jing Zheng,Sherry Shiqian Gao
Background Glass ionomer cement (GIC) is a commonly used restorative material in dentistry , but GIC does not have significant antibiofilm effects and its mechanical strength is limited. Objective To investigate the antibiofilm and mechanical properties of a newly developed silver nanowire (AgNW) modified GIC. Methods GICs were modified with different nanosilver formulations including 0.05%wt AgNW, 0.5%wt AgNW, 0.05%wt silver nanoparticle (AgNP) and 0.5%wt AgNP. Biofilms of Streptococcus mutans were cultured for 72 h on GIC specimens. Scanning electron microscopy (SEM) was conducted to observe the accumulation and morphology of Streptococcus mutans on the material surfaces. Another set of biofilm/specimens was treated with SYTO-9 and the biofilm development was evaluated by quantifying the visible stain with an inverted fluorescence microscope. The compressive strength of the specimens was assessed according to ISO 9917–1:2007. The colour of GICs was compared using the VITA Easyshade system. Results SEM images showed that fewer biofilms were accumulated on nanosilver-modified GICs. The Streptococcus mutans quantity was significantly lower in all nanosilver-modified groups compared to conventional GIC ( p <0.0001). GIC modified with 0.5% AgNP showed slightly lower compressive strength than the negative control (58.3 ± 12.9 MPa vs 78.3 ± 13.8 MPa); but there is no significant difference between all study groups. The colour change between AgNW-modified GIC and conventional GIC was significantly lower than that between AgNP-modified GIC and conventional GIC. Conclusion AgNW-modified GIC showed superior antibiofilm effect and comparable compressive strength to conventional GIC. In addition, the complement of AgNW would not influence the colour stability of GIC as much as AgNP. Clinical Significance This study developed a novel AgNW-modified GIC material. It showed good antibiofilm and mechanical properties and would not influence the colour stability of GIC. The AgNW-modified GIC has a large potential for clinical use and biomedical application.
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