ACS Applied Nano Materials
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2023
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IF 5.9
Yifan Zhi,Jia Xu,Jianlei He,Jiahan Xu,Huanxia Zhang
Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.
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Nanoscale
·
2021
·Vol. 13
·期 17
·8174-8180
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IF 7.79
Zehao Gu,Mengfan Lu,Kai Feng,Zhaoxia Jin
Cellulose nanocrystals (CNCs) are inherently right-handed nanostructures that originate from nature, showing chirality in their fibrils, bundles, and self-assembled films. However, the enantio-specific interaction between CNCs and other chiral molecules has not been explored so far. In this study, we first demonstrated a chirality-related difference in the composite films of cellulose nanocrystals and histidine with a D- or L-configuration. The distinction is not only presented in the self-assembled nanostructures of CNCs, optical properties, and the thermal decomposition of composites but also in the crystallization of the amino acid. We suppose that it might have originated from the packing of amino acids on the twisted surface of CNCs. The knowledge about the enantio-specific interaction between the chiral amino acid and polysaccharide nanostructure is of significant importance for developing a new strategy for enantiomeric separation.
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ENERGY
·
2021
·
IF 7.147
Genyang Tang,Jing Gu,Zhen Huang,Haoran Yuan,Yong Chen
Biomass-derived chemical looping gasification (BCLG) is a novel technology for lignocellulose energy applications . Ca–Fe oxygen carriers have been proven to be a potential material for efficient lignocellulose conversion and hydrogen-enriched syngas production in process studies. In this study, Thermogravimetry-mass spectrometry (TG-MS), pyrolysis chromatography-mass spectrometry (Py-GC-MS) and fixed-bed experiments were conducted, and the cellulose BCLG product was analyzed to explore the mechanism of reaction between Ca–Fe OCs and biomass char or volatiles. The mechanism of the synergistic effect of Ca–Fe was analyzed to explain the characteristics of the OCs. The results suggest the Ca-based materials act as catalysts to promote the decomposition of cellulose monomers at primary reaction and char at secondary reaction, and also promote the reforming and oxidation of volatiles by chemisorption . Ca participates in the construction of inert substances, such as Ca 2 Fe 2 O 5 , to avoid the deep oxidation of CO and H 2 . Fe-based material supplies oxygen and promotes the reforming of volatile. Compared with Fe 2 O 3 and CaO/Fe 2 O 3 , CaFe 2 O 4 shows a better performance on carbon conversion and H 2 production below 850 °C.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Xiaotong Fu,Fulong Zhang,Cuihua Dong,Wenyuan Zhu,Kaifeng Xiong,Zhiqiang Pang
An appropriate cellulose-dissolving solvent is critical for the homogeneous oxidation of cellulose using TEMPO (2, 2, 6, 6-tetramethylpiperidine-1-oxyl)-mediated system. Herein, TEMPO/NaClO/NaClO 2 system in lithium bromide hydrates (LBHs) was developed for the homogeneous selective-oxidation of cellulose, which was two-stage protocol involving cellulose dissolution and homogeneous oxidation. Specifically, cellulose was firstly dissolved in LiBr·3.5H 2 O and offered the optimal pH (5.6) for the subsequent TEMPO/NaClO/NaClO 2 oxidation without precipitation of the cellulose chains. Effect of reaction conditions on cellulose oxidation was investigated. The results showed that high degree of oxidation (DO) and evenly distributed carboxyl could be achieved. The particle size gradually decreased with DO, and oxidized cellulose with high water solubility and amorphous structure could be obtained. Furthermore, FT-IR, 13 C NMR and fractionation analysis verified that cellulose was successfully converted and the carboxyl uniformly distributed onto the cellulose chains. This TEMPO-mediated system using LBHs as solvent presented an efficient method on the homogeneous selective oxidation of primary hydroxyl in cellulose.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 147
·期 12
·6583-6592
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IF 4.626
Yin Qingqing,Xu Fen,Sun Lixian,Li Yaying,Liao Lumin,Wang Tao,Guan Yanxun,Xia Yongpeng,Zhang Chenchen,Wei Sheng,Zhang Huanzhi,Li Bin
Polyethylene glycol (PEG) is widely used as phase change materials (PCMs). However, the leakage and low thermal conductivity issues restrict its practical application. Herein, a series of novel MWCNTs/HPC/PEG PCMs (named as PCM MHP ) have been synthesized by hydroxypropyl cellulose grafting onto PEG for the first time and doping multi-walled carbon nanotubes (MWCNTs). The results indicate that the PCM MHP exhibit excellent shape stability and without leakage keeping warm for an hour at 353.2 K. The melting and freezing enthalpy of the PCM M1HP7 is 134.7 J g −1 and 131.2 J g −1 , respectively; and corresponding melting point and crystallization temperature are about 324.9 K and 308.8 K, respectively. The PCM MHP show a good reversible thermal stability after 100 heating/cooling cycles. In addition, adding 4 mass% MWCNTs, the PCM M4HP7 possess a higher thermal conductivity of 0.6019 W m −1 K −1 , which is 2.1 times that of the PCM HP without MWCNTs (0.2895 W m −1 K −1 ) and 1.9 times that of pure PEG (0.3228 W m −1 K −1 ). In a word, the fabricated PCM MHP is a kind of shape-stabilized PCM and has good latent ability. It will have a broad potential application in thermal energy storage applications.
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EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Lipei Yue,Xiaoyong Zhang,Yijing Wang,Weidong Li,Ying Tang,Yongping Bai
Synthetic conductive materials capable of self-healing have attracted increasing attention and have been developing rapidly because of their potential applications. Despite great achievements, there is a need to advance mechanical properties and reduce the time for healing simultaneously since the branch functionalities are limited and the polymer mobilities are poor in current devices. In this work, we report an effective and simple free radical polymerization approach to synthesize hydrogel using multi-vinyl-modified reduced graphene oxide (rGO) and acrylate monomers containing abundant polar groups. After enhanced by polar groups modified Cellulose Nanocrystal (CNC), the hydrogel exhibits extremely fast electronic self-healing ability and excellent repeatable restoration performance at 25 °C. The stress of hydrogel reaches 2.5 MPa and 1600% of elongation. The hydrogel recovers to its original mechanical and conductive properties within 12 s after cutting and maintains efficiency of nearly 99.3% of its original mechanical and conductive properties after 5 times of cutting and self-healing processes. The design of this conductive, room-temperature self-healing hydrogel takes unique advantage of supramolecular chemistry and polymer nanoscience and shed light on promising applications for self-healing electronics, artificial skins, soft robotics, biomimetic prostheses, and energy storage.
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MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Baowei Qiu,Muxuan Li,Xueqin Zhang,Yang Chen,Shengtai Zhou,Mei Liang,Huawei Zou
Carbon fiber inevitably generates a large number of defects coupling with the multi-functional groups on its surface during the production process. As a result, these defects will cause stress concentration at the interface, thereby reducing the performance of carbon fiber reinforced polymer composites (CFRPs). In this work, a self-driven method is adopted to repair the surface defects of CFs to improve the interface properties of CFRPs. The surface of CFs is sized by nano-carboxymethyl cellulose (CMC) with multi-functional groups. Due to the existence of multi-functional groups on the surface defects of CFs and the non-polarity of other areas in CFs, CMC can automatically gather at the defects via polar attraction between the multi-functional groups to achieve the self-driven repair. Besides, due to the film-forming properties of CMC, the surface defects will be used as a fixed points to form a tight layer of nanofiber membrane with the multi-functional groups on the surface of CFs. It is found that the repair of CFs surface defects and the introduction of multi-functional groups will synergistically enhance the interface performance of epoxy-based composite. The modification method is environmental benign, which lays a research foundation for improving the interface properties of CFRPs using natural cellulose.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Daijun Chen,Xiaoli Zhao,Xinran Wei,Jialin Zhang,Dan Wang,Hao Lu,Pengxiang Jia
Conductive hydrogels have shown great potential in the field of flexible strain sensors. However, their application is greatly limited due to the low conductivity and poor mechanical properties at subzero temperatures. Herein, an ultrastretchable, tough, antifreezing, and conductive cellulose hydrogel was fabricated by grafting acrylonitrile and acrylamide copolymers onto the cellulose chains in the presence of zinc chloride using ceric ammonium nitrate as the initiator. The resulting hydrogel exhibited ultrastretchability (1730%), excellent tensile strength (160 kPa), high elasticity (90%), good toughness (1074.7 kJ/m3), and fatigue resistance property due to the existence of dipole–dipole and multiple hydrogen-bonding interactions on the hydrogel network. In addition, the introduced zinc chloride endowed the cellulose-based hydrogel with remarkable electric conductivity (1.54 S/m) and excellent antifreezing performance (−33 °C). Finally, the hydrogel showed high sensitivity and stability to monitor human activities. In summary, this work presented a facile strategy to construct conductive hydrogel with excellent antifreezing and mechanical properties simultaneously, which showed great potential for wearable strain sensors.
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ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Qingli Qu,Jian Zhang,Xiaoqiong Chen,Hossein Ravanbakhsh,Guosheng Tang,Ranhua Xiong,Bella B. Manshian,Stefaan J. Soenen,Félix Sauvage,Kevin Braeckmans,Stefaan C. De Smedt,Chaobo Huang
Triggered compound release has attracted considerable attention in recent years. However, the concepts and carriers reported for triggered release are often complex while nonapproved ingredients are mostly used to make the carriers. In this study, a bioinspired reactive oxygen species (ROS)-mediated delivery system, triggered by light, is introduced. We took inspiration from the well-known ROS mediated degradation of wood (cellulose) by brown-rot fungi and designed microparticles which consist of a core of cellulose nanocrystals, loaded with a drug, surrounded by a light sensitive shell. Incorporating indocyanine green, an FDA-approved photosensitizer, in the shell of the microparticles generates ROS upon NIR laser irradiation, which degrades the cellulose nanocrystals in the microparticles. It was revealed that doxorubicin, encapsulated in the cellulose core and used as a model compound in our study, becomes specifically released upon NIR irradiation of the microparticles. Attractive as well is that the microparticles are prepared by a simple one-step gas-shearing process and fully consist of compounds generally regarded as safe (GRAS).
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Xijun Fu,Guoqing Li,Shaoyong Cai,Heng Yang,Kang Lin,Miao He,Junwei Wen,Houbin Li,Yabo Xiong,Dongzhi Chen,Xinghai Liu
Many anti-counterfeiting inks have been explored recently, most of them are commonly involved in weak fastness, high cost and long-term toxicity, impeding their real-life applications. Herein, an environment-friendly and inexpensive anti-counterfeiting ink with excellent fastness is reported. The untifake ink is developed by combining hybrid dots (silicon/carbon) with hydroxyethyl cellulose (HEC) binder. Interestingly, the HEC binder can effectively prevent from aggregation-induced quenching of hybrid dots. Subsequently, the customized patterns are successfully transferred onto different surfaces of various substrates including cotton fabric, cellulosic paper, glass, metal, silicon wafer and PET film, using the as-prepared ink by screen-printing technique, exhibiting that the hybrid dots/HEC ink possesses widespread practicability. Notably, fluorescent color of these patterns can be switchable by adjusting environmental pH-value, further imparting the as-prepared ink with excellent covert performance. This new fluorescent hybrid dots/HEC ink will be promising candidates for high-level anti-counterfeiting applications including food packaging, apparel and documents.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Zhenxing Wang,Xiaoshuai Han,Xuewen Han,Zhibing Chen,Sijie Wang,Junwen Pu
Electromagnetic-interference (EMI) shielding materials that are green, lightweight, and with high mechanical properties need to be urgently developed to address increasingly severe radiation pollution. However, limited EMI shielding materials are successfully used in practical applications, due to the intensive energy consumption or the absence of sufficient strength. Herein, an environmentally friendly and effective method was proved to fabricate wood-based composites with high mechanical robustness and EMI shielding performance by a MXene/cellulose scaffold assembly strategy. The lignocellulose composites with a millimeter–thick mimic the “mortar-brick” layered structure, resulting in excellent mechanical properties that can achieve the compressive strength of 288 MPa and EMI shielding effectiveness of 39.3 dB. This “top-down” method provides an alternative for the efficient production of robust and sustainable EMI shielding materials that can be used in the fields of structural materials for next-generation communications and electronic devices.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Caidi Jin,Ning Xiang,Xiao Zhu,Shuang E,Kuichuan Sheng,Ximing Zhang
5-hydroxymethylfurfural (HMF) can be widely converted into value-added chemicals and fuels production. Herein, we reported a sustainable and efficient approach for synthesizing HMF directly from cellulose. Facile formylation of cellulose with green and recyclable formic acid was developed for cellulose formate (CF) production. CF with special net-like structure and high degree of formyl substitution was prepared. The resultant CF exhibited excellent catalytic conversion and selectivity for HMF production comparable to monomeric glucose as reactant in dimethyl sulfoxide (DMSO)-H 2 O media. In our work, we presented molecular dynamics simulations to elaborate the preferential coordination of DMSO around formyl group, which promoted the solvation of formylated substrate in DMSO-H 2 O mixture, and the HMF yielded could be protected by DMSO without further degradation to levulinic acid or humins.
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