POLYMER BULLETIN
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2022
·Vol. 80
·期 5
·5587-5605
·
IF 2.843
Zhou Jiacheng,Wu Linlin,Ge Yongxin,Gao Yifeng,Ma Xiaofeng,Fang Ying
Deep eutectic solvent (DES)-based gels, with their biocompatibility, non-volatility, low cost, and electrochemical stability, have attracted widespread interest as novel solid-state ionic conductor for flexible devices. However, fabrication of tough and stretchable DES gels is challenging due to the insufficient understanding of the interactions between polymers and DES. The development of tough DES gels based on hydrogen bonding is attractive but also challenging due to the possible competitive hydrogen bonds between the hydrogen bond-rich choline chloride-based polar DES and polymers. Herein, tough copolymer-supported DES gels with dual-cross-linked dissipative network were fabricated through copolymerization of methacrylic acid and N , N -dimethylacrylamide monomers with good and poor compatibility with DES to promote the formation of stable hydrogen bonds between polymers in the DES. The resulting DES gels were stiff, tough, stretchable, and self-recoverable, with tensile strength, breaking strain, Young's modulus, toughness, and recovery ratio being 2.08 MPa, 792%, 1.76 MPa, 12.88 MJ m −3 , and 76%, respectively. The mechanical properties of DES gels could be widely tuned by varying the monomer ratio and solvent structure changes. The carbon-based supercapacitor based on the DES gel shows stable voltage window to 2 V and exhibits the specific capacitance of 93.25 F g −1 at 2 A g −1 . Graphical abstract An ultratough and stretchable copolymer-supported DES gel ionic conductor with high tensile strength of 2.08 Mpa, high toughness of 12.88 MJ m −3 , stretchability of 792%, and excellent recovery properties are facile fabricated for flexible electronics through copolymerization of two monomer pairs of methacrylic acid and N , N -dimethylacrylamide that can form stable hydrogen bonds in the DES environment with a small amount of chemical cross-linker to form a dual-crosslinked dissipative network.
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CELLULOSE
·
2022
·Vol. 29
·期 15
·8133-8150
·
IF 6.123
Sun Liangyun,Han Juan,Tang Chaofan,Wu Jiacong,Fang Sihan,Li Yuanyuan,Mao Yanli,Wang Lei,Wang Yun
As an effective substitute for ionic liquids (ILs), deep eutectic solvents (DESs) are known as a new generation of green solvents. In addition, DESs are considered to be the best solvents to replace traditional organic solvents and ILs due to their advantages of economy, simple preparation and biodegradability, which can be used to further break through the technical bottleneck in the field of biomass pretreatment. This study synthesized a series of choline chloride-based (ChCl-based) DESs and used them to pretreat microcrystalline cellulose (MCC) without dissolution, in order to achieve the purpose of improving the saccharification effect. DES-9 (ChCl/hydroquinone), DES-12 (ChCl/acetamide) and DES-16 (ChCl/acetic acid) were better pretreatment solvents. The optimum conditions for the pretreatment of MCC by DES-9 and DES-12 were both at 110 °C for 4 h, and the optimum condition of DES-16 was at 90 °C for 4 h. Compared with untreated MCC (26.66%), the saccharification yield of pretreated MCC with DES-16 increased by 20.5%. Finally, the structure and morphology changes of MCC before and after pretreatment were investigated in detail through the degree of polymerization (DP), SEM and enzyme adsorption. The results showed that DESs pretreatment made the surface of MCC become rough, which enhanced the accessibility of cellulose and enzymes, improving the saccharification effect. Graphical abstract
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CANCER GENE THERAPY
·
2022
·Vol. 29
·期 12
·1939-1950
·
IF 5.854
Yang Fan,Li Lin,Mu Zhenzhen,Liu Pengyue,Wang Ying,Zhang Yue,Han Xiuping
The nuclear import receptor karyopherin β1 (KPNB1), a member of the Karyopherin protein family, is reported to be overexpressed in various cancers and promote carcinogenesis. By analyzing the correlation between the expression of KPNB1 and the overall survival rate of melanoma patients, we found that melanoma patients with higher expression of KPNB1 had worse survival. Furthermore, the database analyzed that the KPNB1 mRNA level was higher in melanoma samples than that in skin nevus tissues. We thus proposed that KPNB1 played a role in promoting melanoma development, and conducted gain-of- and loss-of-function experiments to test our hypothesis. We found that KPNB1 knockdown significantly retarded the growth and metastasis of melanoma cells in vitro and in vivo, and increased their sensitivity towards the anti-tumor drug cisplatin. KPNB1 overexpression had opposite effects. Notably, in melanoma cells, KPNB1 overexpression significantly decreased Ras-GTPase-activating protein SH3 domain-binding protein 1 (G3BP1) protein level, which was also overexpressed in melanoma samples and enhanced malignant behaviors of melanoma cells. We further demonstrated that KPNB1 overexpression induced deubiquitination of G3BP1, and prevented its degradation. However, KPNB1 overexpression hardly affected the nuclear translocation of G3BP1. Additionally, alterations induced by KPNB1 overexpression were partly reversed by G3BP1 inhibition. Therefore, the results suggest that KPNB1 may promote melanoma progression by stabilizing the G3BP1 protein. KPNB1-G3BP1 axis represents a potential therapeutic targetable node for melanoma.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 104
·期 1
·105-115
·
IF 2.606
Yang Haixia,Yue Xiandong,Ye Feng
Porous Si 3 N 4 /silica aerogel composites were prepared by sol impregnation with porous Si 3 N 4 as the framework, and the microstructure evolution and properties of the composites were studied in detail at high temperature. Porous Si 3 N 4 had a strong skeleton structure, which effectively inhibited the pore collapse of the aerogel, kept the nanostructure stable to 1100 °C, and significantly improved the temperature resistance of the silica aerogel. Preventing the growth of gel particles and pore collapse at temperatures above 1100 °C was difficult, and the silica aerogel gradually crystallised. When the temperature reached 1300 °C, the aerogel inside was completely crystallised, and the nanopore structure basically disappeared. The specific surface area of the composite decreased with increasing temperature, whereas the pore size and thermal conductivity increased with increasing temperature. The high-temperature thermal insulation performance was tested, and the composite material exhibited low thermal conductivity (0.254 W m −1 K −1 ) at even 1300 °C, which suggests this composite is suitable for thermal insulation use in a high-temperature environment.
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Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 6
·1731-1741
·
IF 2.339
He Jiajian,Cheng Kai,Lin Ruijun,Su Qiuping,Li Yong,Ma Zhiping,Wang Shaoshun,Gu Yuxin,Lin Xiaofeng,Lin Wenjing,Yi Guobin
In this work, a malonate polyester suitable for Michael addition reaction was prepared by melting polycondensation of neopentyl glycol, terephthalic acid, and diethyl malonate, and its structure was characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR). Then, Michael addition reaction between malonate polyester and diphenylmethane bismaleimide (BDM), catalyzed by 1, 8-diazabicyclo [5.4.0] undec-7-ene (DBU)/benzoic acid salt, was carried out to prepare the films with different contents of curing agent. The thermal and mechanical properties of the films were characterized by dynamic thermomechanical analysis, thermogravimetric analysis, and differential scanning calorimetry. We found that glass transition temperature ( T g ) of the films increased with the increase in BDM amount. The T g could reach up to 80°C, which indicated that the fabricated films show excellent thermal stability.
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JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
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2022
·Vol. 59
·期 12
·4653-4662
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IF 3.117
Chen Hongshuo,Liu Haibin,Cui Chuanjin,Zhang Wensi,Zuo Yueming
In this study, a simple label-free biosensor for Brucella was constructed, which based on the screen-printed carbon electrode (SPCE) modified by Recombinant protein G/gold nanoparticles/graphene oxide (RpG/Au/GO). The impedance responses of the proposed biosensor were measured by electrochemical AC impedance method in Brucella antigen gradient concentration solutions. The results showed that the linear range of this biosensor was from 1.6 × 10 2 CFU/mL to 1.6 × 10 8 CFU/mL with the minimum detection limit of 3.2 × 10 2 CFU/mL (S/N = 3). Moreover, the biosensor for Brucella detection possessed acceptable reproducibility with a relative standard deviation of 5.15% and acceptable stability with a relative standard deviation of 4.68%. The spiked recovery rate in actual pasteurized milk samples was more than 92% . Therefore, the developed biosensor exhibits excellent prospects in the selective quantification detection of Brucella abortus .
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高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-13
·
IF 17.694
Ge Xiaohu,Dou Mingying,Cao Yueqiang,Liu Xi,Yuwen Qiang,Zhang Jing,Qian Gang,Gong Xueqing,Zhou Xinggui,Chen Liwei,Yuan Weikang,Duan Xuezhi
Mechanism driven catalyst design with atomically uniform ensemble sites is an important yet challenging issue in heterogeneous catalysis associated with breaking the activity-selectivity trade-off. Herein, a trimer Ni 1 Sb 2 site in NiSb intermetallic featuring superior selectivity is elaborated for acetylene semi-hydrogenation via a theoretical guidance with a precise synthesis strategy. The trimer Ni 1 Sb 2 site in NiSb intermetallic is predicted to endow acetylene reactant with an adequately but not excessively strong σ-adsorption mode while ethylene product with a weak π-adsorption one, where such compromise delivers higher ethylene formation rate. An in-situ trapping of molten Sb by Ni strategy is developed to realize the construction of Ni 1 Sb 2 site in the intermetallic P6 3 /mmc NiSb catalysts. Such catalyst exhibits ethylene selectivity up to 93.2% at 100% of acetylene conversion, significantly prevailing over the referred Ni catalyst. These insights shed new lights on rational catalyst design by taming active sites to energetically match targeted reaction pathway.
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CELLULOSE
·
2022
·Vol. 29
·期 17
·9235-9249
·
IF 6.123
Wang Kaili,Li Xiaoran,Peng Haozhe,Dong Youming,Li Yanjun,Liu Xiaorong,Li Jianzhang
It is of great practical significance to prepare high-performance biopolymer composite films from renewable resources to replace ubiquitous petrochemical plastics. However, the unsatisfactory mechanical properties and single functionality of bio-polymers make them unable to meet the requirements of practical application. Herein, the tough, strong and renewable soy protein isolate (SPI) composite films with outstanding photothermal conversion and UV-blocking performance were prepared by facile blending and casting methods with integration of cellulose nanofibrils (CNF)@MXene hybrid nanosheets as reinforcers and branched polyethyleneimine (PEI) as a plasticizer. The resultant SPI/PEI/CNF@MXene films presented outstanding mechanical properties i.e., tensile strength of 17.31 MPa, toughness of 16.01 MJ/m 3 , high strain at failure of 114.10%. Furthermore, the SPI/PEI/CNF@MXene films can almost block 100% of UV spectrum and also exhibit satisfactory photothermal driven conversion. These comprehensive properties make it have great potential application as mulching films, packaging engineering, and UV-blocking fields.
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JOURNAL OF FLUORESCENCE
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2022
·Vol. 32
·期 6
·2343-2350
·
IF 2.525
Liu Tao,Zhang Shuai,Fan Xiaoyu,Yang Dou,Wang Min,Shao Xiaodong,Wang Shuhao,Yue Qiaoli
Carbon dots (CDs) were used to develop a sensitive sensing technique for detecting Cr(VI). CDs were made using a hydrothermal technique from citric acid and glutamic acid. These prepared CDs emitted blue fluorescence under excitation of 350 nm (λ em = 420 nm), and the fluorescence quantum yield was 48.41%. Transmission electron microscope was used to examine the morphology of the CDs, which had an average size of 2.21 ± 0.39 nm. The elementary composition and bonding structure of the CDs were conducted by XPS and FT-IR spectrum. Cr(VI) quenched the fluorescence of CDs through a static quenching effect and an inner filter effect, allowing Cr(VI) to be detected quantitatively. This approach was used to detect Cr(VI) in two samples of water, with the findings demonstrating that it is reliable and accurate. The fluorescence intensity change was linearly related to the concentration of Cr(VI) in the range from 0.5 to 400 μM, with the detection limit being 0.10 μM. This approach has the virtues of wide detection range, low cost and fast response. The strategy has a great application prospect for detecting Cr(VI) in practical samples.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 12
·6964-6974
·
IF 2.047
Geng Zhibin,Liu Hong,Xiong Wei
Polymer/conductor composites are used in energy storage capacitors; however, they exhibit high interface leakage currents, causing low breakdown strength. Here, a ternary-blend strategy was used to synthesize polyvinyl chloride (PVC)/titanium carbide transition-metal carbide two-dimensional nanolayered material (Ti 2 C MXene)/diamond composites using solution casting. The PVC matrix exhibited low polarity and high insulation, while the Ti 2 C MXene and diamond fillers exhibited high conductivities and ultrahigh insulation properties, respectively. Overall, the PVC/Ti 2 C/diamond ternary composites exhibited better electrical properties than the PVC/Ti 2 C binary composites. In the ternary composites, PVC/Ti 2 C interface polarization caused high dielectric constants, while low leakage currents induced by diamond caused low dielectric losses and high breakdown strength. The optimum-composition (12 wt.% Ti 2 C and 4 wt.% diamond) ternary composite exhibited a high dielectric constant (~153 at 100 Hz), low dielectric loss (~0.14 at 100 Hz), low conductivity (~1.4 × 10 −6 S m −1 at 100 Hz), and high breakdown strength (~312 MV m −1 under a direct current field). This study indicates a synergistic effect between Ti 2 C MXene and diamond in the composite dielectrics, and could guide the fabrication of dielectric films for capacitors. Graphical Abstract
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CELLULOSE
·
2022
·Vol. 29
·期 17
·9323-9339
·
IF 6.123
Zhang Lei,Hu Oudong,Zhang Jin,Hou Linxi,Ye Dezhan,Jiang Xiancai,Xiao Gao
Integrating high ionic conductivity and robust mechanical properties into one hydrogel remains challenging to date. In this paper, poly(vinyl alcohol)/carboxymethyl chitosan/tannic acid/NaCl/glycerol (PCTNG) organohydrogel was prepared by introducing tannic acid (TA), NaCl and glycerol (Gly) into poly(vinyl alcohol)/carboxymethyl chitosan (PVA/CMCS) simultaneously. Owing to the multiple hydrogen bonding complexations, the salting-out effect and metal coordination, the PCTNG organohydrogel showed an attractive overall performance with high tensile strength (2.02 MPa), large elongation at break (570.82%), superb ionic conductivity (3.05 S/m), excellent thermoplasticity and thermally assisted self-healing ability. Moreover, the introduction of Gly made PCTNG organohydrogel had high anti-freezing and anti-dehydration properties. The introduction of TA and NaCl endowed PCTNG organohydrogel with anti-bacterial properties. A flexible strain sensor was made based on this organoydrogel and this strain sensor could detect various human activities. This study provided a simple and promising strategy for manufacturing ionic conductive organohydrogel for flexible wearable devices. Graphical abstract
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Journal of Consumer Protection and Food Safety
·
2022
·Vol. 17
·期 3
·209-219
·
IF 2.628
Xie Jing-Ya,Tan Jin
This article describes a novel front-face synchronous fluorescence spectroscopy (FFSFS) method for the fast and non-invasive authentication of ground roasted Arabica coffee adulterated with roasted maize and soybean flours. The detection was based on the different composition of fluorescent Maillard reaction products and caffeine in roasted coffee and cereal flours. For each roasted maize or soybean adulterant flour (5–40 wt%), principal component analysis coupled with linear discriminant analysis (PCA–LDA) was used for qualitative discrimination. Quantitative prediction models were constructed based on the combination of unfolded total synchronous fluorescence spectra and partial least square regression (PLSR), followed by fivefold cross-validation and external validation. The PLSR models produced suitable results, with the determination coefficient of prediction ( R p 2 ) > 0.9, root mean square error of prediction (RMSEP) < 5%, relative error of prediction (REP) < 25% and residual predictive deviation (RPD) > 3. The limits of detection (LOD) were both 10% for roasted maize and soybean flours. Most relative errors for the prediction of simulated blind samples were between -30% and + 30%. The benefits of this strategy are simplicity, rapidity, and non-destructive detection. However, owing to the high similarity between roasted coffee and roasted cereal flours and the influence of the roasting degree on fluorescent Maillard reaction products, its application is limited to the preliminary screening of roasted coffee with the same roasting degree, adulterated with relatively large amounts of roasted cereal flours which are roasted to analogous color to the coffee.
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