JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 10
·1-12
·
IF 3.061
Dong Haonan,Wang Yuanmeng,Fan Min,Zhao Jingbo,Zhang Zhiyuan,Zhang Junying
A simple route is established to synthesize segmented polyurethanes constructed mainly with polystyrene and poly(butylene adipate) sequences. A long dihydroxyl terminated polystyrene (HO-PS-OH) was synthesized through the radical polymerization of styrene with 4.4′-azobis(4-cyanopentanol) as initiator. The HO-PS-OH, HO-terminated poly(butylene adipate) (HO-PBA-OH), and 4,4′-methylenediphenyl diisocyanate (MDI) were polymerized further in a one-step solution process, and a series of multi-block polystyrene-block-poly(butylene adipate) TPUs (PS–b-PBA TPUs) was prepared. Meanwhile, five two-step PS–b-PBA TPUs (ts- PS–b-PBA TPUs) were also prepared; that is, the HO-PBA-OH was first reacted with excessive MDI to obtain long OCN-terminated PBA-methylenediphenyl diurethane (PBA-MDU) prepolymers, and then it was polymerized with HO-PS-OH to form ts-PS–b-PBA TPUs. PS–b-PBA TPUs and ts-PS–b-PBA TPUs all showed two glass transition temperatures. Phase separation occurred between their hard and soft phases. Different from amorphous ts-PS–b-PBA TPUs that were constructed with long PBA-MDU soft segments (SSs) and PS-MDU hard segments (HSs), short and scattered PBA-MDU SSs and PS-MDU HSs led to crystallized PS–b-PBA TPUs that showed better mechanical property than ts-PS–b-PBA TPUs. Long amorphous PS and crystallizable PBA sequences provided the PS–b-PBA TPUs with high T g and good thermal and mechanical properties.
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高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-13
·
IF 23.655
Wei Junjie,Li Rui,Li Long,Wang Wenqin,Chen Tao
Stimuli-responsive hydrogel is regarded as one of the most promising smart soft materials for the next-generation advanced technologies and intelligence robots, but the limited variety of stimulus has become a non-negligible issue restricting its further development. Herein, we develop a new stimulus of “touch” (i.e., spatial contact with foreign object) for smart materials and propose a flytrap-inspired touch-responsive polymeric hydrogel based on supersaturated salt solution, exhibiting multiple responsive behaviors in crystallization, heat releasing, and electric signal under touch stimulation. Furthermore, utilizing flytrap-like cascade response strategy, a soft actuator with touch-responsive actuation is fabricated by employing the touch-responsive hydrogel and the thermo-responsive hydrogel. This investigation provides a facile and versatile strategy to design touch-responsive smart materials, enabling a profound potential application in intelligence areas.
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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 16
·8769-8780
·
IF 6.123
Bao Chunyang,Chen Jing,Wang Yan,Yang Tao,Xu Xiaoling,Zhang Qiang
Cellulose-based matrices are expected to be ideal enzyme carriers due to their sustainability and biocompatibility. However, the linkages between immobilized enzymes and celluloses often suffer from low-density and non-biodegradability, leading to inefficient loading of enzymes as well as persistent generation of solid wastes after reuse. In the present study, cellulose-based functional materials with degradable polycarbonates brushes have been successfully synthesized as enzyme carriers via ring-opening polymerization of 5-methyl-5-allyloxycarbonyl-1,3-dioxan-2-one (MAC) following with ally epoxidation of MAC units. After covalent bonding with laccase, the resulting HPC-PMAC-Laccase could assemble in aqueous solution to form spherical nanoparticles with an enzyme immobilization efficiency of 88%. The immobilized laccase showed more tolerance towards pH and high temperature compared with free laccase. Moreover, the immobilized laccase demonstrated effective removal efficiency of bisphenol A and reached 83% in 3 h. After repeated usage for 8 times, the HPC-PMAC-Laccase still maintained relatively high enzyme activity. Especially, the polycarbonates brushes in the enzyme carriers could be totally hydrolyzed in 12 h to achieve its degradable property. Graphical abstract Cellulose-based functional polycarbonates as degradable enzyme carriers.
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高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 3
·1024-1032
·
IF 8.64
Li Weimo,Li Meixuan,Wang Ce,Lu Xiaofeng
Iridium (Ir)-incorporated cobalt (Co) nanofibers (Co-Ir-600) are fabricated via an electrospinning-calcination- in situ H 2 reduction-galvanic replacement process. Benefitting from the unique one-dimensional nanofibrous heterostructure that allows rapid electron/mass transfer as well as the synergy between Ir and Co components, the Co-Ir catalyst shows a remarkable electrocatalytic activity for oxygen evolution reaction (OER) with an extremely low overpotential of 169 mV at 10 mA cm −2 in an alkaline electrolyte. Furthermore, the catalyst also presents a high hydrogen evolution reaction (HER) performance. Therefore, an alkaline electrolyzer is constructed with the Co-Ir-600 nanofibrous catalyst as both the anode and cathode electrodes, and only a small cell voltage of 1.51 V is needed to achieve 10 mA cm −2 with outstanding durability. This performance is superior to that of benchmark Pt/C∥IrO 2 electrodes and many other reported water electrolysis cells. This study supplies a general and efficient way to prepare cost-effective and high-performance metal-based overall water splitting electrocatalysts.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 8
·2279-2295
·
IF 2.936
Chen Lisha,Wang Yuqing,Dong Shanshan,Chen Suhua,Luo Shenglian
We prepared in-plane heterostructural photocatalysts of enhanced photocatalytic performance by coplanar grafting nitrogen-doped carbon plane (NDCP) to graphitic carbon nitride (g-C 3 N 4 ) network. The optimal heterostructural photocatalyst with efficient in-plane built-in electric field achieved 1472.5 μmol g −1 h −1 hydrogen evolution rate, 97.0% removal of Rhodamine B and 91.9% removal of sulfamethoxazole under visible light irradiation. The high photodegradation performance was maintained in water matrices. Graphical abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 10
·1-11
·
IF 2.983
Xi Yuchun,Yin Chuanqiang,Xu Lexiang,Xiong Wei,Xu Hang,Luo Jinpeng,Huang Shirong,Ma Lei,Zhou Lang,Li Xiaomin
The excellent thermal conductivity of graphite films makes it an ideal thermal management material in the field of electronics. Flexibility is an important property for preparing polyimide (PI)-derived graphite films with high thermal conductivity. In the study, hexagonal boron nitride (h-BN) was used as a foaming agent to improve the flexibility of PI-derived graphite films. A series of graphite films were prepared via carbonization and graphitization of self-synthesized polyimide films using h-BN as the foaming agent. The influence of different amounts of h-BN on the structure, flexibility, and thermal conductivity of graphite films was studied in detail. Compared with pure PI-derived graphite film, the flexibilities of h-BN/PI-derived graphite films improved significantly. The flexibility improvement mechanism of graphite film using h-BN as foaming agent was also proposed. The vaporization of BN powders at ultra-high temperature results in the pressure difference between inside and outside of the graphite layers, and then the graphitic “bubbles” were formed on the graphite film. The semicircular “bubbles” created by h-BN sublimation could provide enough adjustment space for the shear slip, and some of the forces around the pores could be partially offset. According to the results, the graphite film derived from the 0.06 wt% h-BN/PI composite film owe the best comprehensive performance, including excellent flexibility, relatively high thermal diffusivity and high in-plane thermal conductivity. This research has important application value in the field of heat dissipation of electronic devices. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 29
·22773-22784
·
IF 2.779
Chen Xin,Ouyang Yuting,Liu Xiukun,Ruan Hong,Xu Xu,Lu Shaorong,Li Yuqi
Providing a green and sustainable cathodic protection method for metal surfaces is the key to increasing the service life of equipment. Herein, furan-modified CaCu 3 Ti 4 O 12 (F-CCTO) and polyurethane with maleimide group as side group (MPU) were synthesized to prepare the high-performance dynamic covalent-crosslinked F-CCTO/MPU (FP) composites. And then the FP composites were further used to construct a triboelectric nanogenerator (FP-TENG) for Q235 steel cathodic protection. The results show that at 1-wt% F-CCTO content, the tensile strength and T 10% of the FP composite increased by 83.3% and 30 °C, respectively, compared with those of pure MPU. In addition, short-circuit current ( I sc ), open-circuit voltage ( V oc ), and peak power density of the FP-TENG were 4.6 μA, 100 V, and 3.3 Wm −2 , respectively. Notably, the mechanical and electrical output properties of the reprocessed FP composites obtained using the inverse Diels–Alder (DA) reaction are almost unchanged compared to the original FP composites. Electrochemical experimental results confirmed that the Q235 steel connected to the FP-TENG cathodic protection system exhibits excellent corrosion resistance. The corrosion potential of Q235 steel was reduced by about 110 mV, and in addition, the corrosion prevention mechanism of self-powered cathodic protection of metal surfaces was discussed.
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高影响因子
LUNG
·
2022
·Vol. 200
·期 5
·619-631
·
IF 3.777
Zhai Cui,Zhang Nana,Wang Jian,Cao Meng,Luan Jing,Liu Huan,zhang Qianqian,Zhu Yanting,Xue Yuxin,Li Shaojun
Purpose It has been shown that activation of autophagy promotes the development of pulmonary arterial hypertension (PAH). Meanwhile, forkhead box M1 (FOXM1) has been found to induce autophagy in several types of cancer. However, it is still unclear whether FOXM1 mediates autophagy activation in PAH, and detailed mechanisms responsible for these processes are indefinite. Method PAH was induced by a single intraperitoneal injection of monocrotaline (MCT) to rats. The right ventricle systolic pressure (RVSP), right ventricular hypertrophy index (RVHI), percentage of medial wall thickness (%MT), α-smooth muscle actin (α-SMA) staining, and Ki67 staining were performed to evaluate the development of PAH. The protein levels of FOXM1, phospho-focal adhesion kinase (p-FAK), FAK, and LC3B were determined by immunoblotting or immunohistochemistry. Results FOXM1 protein level and FAK activity were significantly increased in MCT-induced PAH rats, this was accompanied with the activation of autophagy. Pharmacological inhibition of FOXM1 or FAK suppressed MCT-induced autophagy activation, decreased RVSP, RVHI and %MT in MCT-induced PAH rats, and inhibited the proliferation of pulmonary arterial smooth muscle cells and pulmonary vessel muscularization in MCT-induced PAH rats. Conclusion FOXM1 promotes the development of PAH by inducing FAK phosphorylation and subsequent activation of autophagy in MCT-treated rats.
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PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 12
·1-18
·
IF 2.983
He Yuan,Guo Shenghui,Li Shiwei,Yin Shaohua
Y Zeolite plays an irreplaceable role in many important applications due to its unique physicochemical properties, which has attracted extensive attention from researchers. Response surface methodology (RSM) was used to optimize the process parameters for the hydrothermal synthesis of Y zeolite using kaolin activated by microwave heating. The best relative crystallinity was 108.17% could be achieved at the condition: the aging temperature of guiding agent was 65 ℃, the crystallization temperature was 100 ℃, the crystallization time was 24 h. In addition, the aging temperature of guiding agent was the most important influence factor. Under the optimal condition, the SiO 2 /Al 2 O 3 ratio of synthesized Y zeolite was 4.54, 90% of the particle size was less than 60 μm, and the specific surface area of Y zeolite was 479 m 2 /g. The successful preparation of Y zeolite with high crystallinity is expected to provide reference for the application of wastewater treatment, CO 2 sequestration and fluid catalytic cracking for petroleum.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 34
·26040-26049
·
IF 2.779
Liu Hongtao,Miao Xinyue,Wang Kelin,Gao Jieyu,Geng Hailong,Deng Xiong
The power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs) are affected by the presence of Pb-I antisite and I vacancy defects. Here, we propose a strategy for synchronous passivation of defects by Lewis bases D-Tryptophan methyl ester hydrochloride (D-TMe·HCl). The results show that the amino and carboxyl groups in D-TMe·HCl could synchronously passivate the Pb-I antisite and I vacancy defects through ionic and hydrogen bonding. In addition, the inhibition of ion migration of Pb 2+ and I − effectively suppresses charge recombination and promotes interfacial carrier extraction. As a result, the PCE of the device with D-TMe·HCl increased to 20.59% with a fill factor of 79.8%. Furthermore, the introduction of D-TMe·HCl promotes the crystallinity of the perovskite and obtains a more dense and uniform film, thus the stability of the device is enhanced. The device with D-TMe·HCl retains more than 94% of its initial PCE after aging in a glovebox for 500 h under nitrogen conditions. This work opens up a new avenue for achieving efficient and stable PSCs by forming high-quality films, synchronously passivating defects, and inhibiting ion migration.
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高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 20
·期 1
·321-331
·
IF 2.339
Bian Fuping,Li Xiaoquan,Zhao Jihe,Hu Jiwen,Gui Xuefeng,Li Shi,Lin Shudong
As described herein, a simple one-step hydrosilylation reaction was employed to synthesize alicyclic epoxy silicone prepolymers by using poly(dimethylsiloxane-co-methylhydrosiloxane) (PDMS-PHMS) with different hydrogen contents and 4-vinyl-1-cyclohexene-1,2 epoxide (VCHO) as precursors. The structures of the synthesized epoxy polysiloxane oligomer was characterized by Fourier-transform infrared (FTIR) and proton nuclear magnetic resonance ( 1 H-NMR) spectroscopy techniques, thus confirming the successful synthesis of the prepolymers. With the addition of an appropriate amount of cationic photoinitiator, the epoxy polysiloxane prepolymers undergo cationic polymerization under ultraviolet light irradiation and were quickly cured to yield series of epoxy polysiloxane resin films. The performances of these cured films were tested and characterized by various techniques such as UV transmittance, thermal weight loss analysis, and contact angle and pencil hardness measurements. The results revealed that the surfaces of these films were uniform and transparent, and these films had excellent heat resistance, acid resistance, hydrophobicity, and ink removal properties. In addition, the influence of the cycloaliphatic epoxy monomer content on the curing behavior and network performance is explored. This study reveals that the curing rate increases as the amount of grafted cycloaliphatic epoxy monomer is increased and that a denser crosslinking network provides the resultant film. Finally, the photocurable silicone material investigated herein is simple to prepare and has excellent performance, and has potential applications in the field of anti-smudge coatings.
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高影响因子
Stem Cell Research & Therapy
·
2022
·Vol. 13
·期 1
·1-16
·
IF 8.079
Cui XiaoLing,Wang XiaoTan,Wen Jie,Li Xiao,Li Nan,Hao XuXiao,Zhao BaoXiang,Wu Xunwei,Miao JunYing
Background Human dermal fibroblasts (HDFs) have the potential to differentiate into vascular endothelial cells (VECs), but their differentiation rate is low and the mechanism involved is not clear. The small molecule pathway controls the phenotype of fibroblasts by activating cellular signaling pathways, which is a more convenient method in the differentiation strategy of HDFs into VECs. Methods In this study, HDFs were treated with the different doses of CPP ((E)-4-(4-(4-(7-(diethylamino)-2-oxo-2H-chromene-3-carbonyl) piperazin-1-yl) styryl)-1-methylpyridin-1-ium iodide), and the mRNA and protein levels of HDFs were detected by qPCR, Western blot, flow cytometry and immunofluorescent staining. The matrigel assays, acetylated-LDL uptake and angiogenesis assays of chick embryo chorioallantoic membrane (CAM) and hindlimb ischemia model of nude mice were performed to evaluate the functions of VECs derived from HDFs. Results Here, we report that the small chemical molecule, CPP, can effectively induce HDFs to differentiate into VECs. First, we observed the morphological changes of HDFS treated with CPP. Flow cytometry, Western blot and qRT-PCR analyses showed that CPP effectively decreased the level of the HDFs-marker Vimentin and increased levels of the VEC-markers CD31, CD133, TEK, ERG, vWF, KDR and CDH5. Detection of the percentage of CD31-positive cells by immunofluorescent staining confirmed that CPP can effectively induce HDFs to differentiate into VECs. The results of Matrigel assays, DiI-ac-LDL uptake, angiogenesis assays on CAM and hindlimb ischemia model of nude mice showed that CPP-induced HDFs have the functions of VECs in vitro and in vivo. Western blot and qRT-PCR analysis showed that CPP induces HDFs to differentiate into VECs by promoting the expression of pro-angiogenic factors (VEGF, FGF-2 and PDGF-BB). Conclusions Our data suggest that the small chemical molecule CPP efficiently induces the differentiation of HDFs into VECs. Simultaneously, this new inducer provides a potential to develop new approaches to restore vascular function for the treatment of ischemic vascular diseases.
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高影响因子
危险品化学品经营许可证（带存储）