MACROMOLECULAR RESEARCH
·
2023
·Vol. 31
·期 8
·771-779
·
IF 2.4
Zhu Zhaolin,Liu Yin,Xian Guiyang,Wang Yan,Wu Chongmei,Peng Xiaobo,Wang Jinxiang,Kong Lingbing
Hollow glass microspheres (HGMs), as a reinforcing material to prepare lightweight high-performance composites, have excellent mechanical properties. However, the composites prepared by simply mixing hollow glass microspheres with polymer resin have poor performance. In this study, compound coupling agent-modified HGM/EP composites were prepared by casting process with two silane coupling agents as compound coupling agents. Scanning electron microscopy and infrared (IR) spectroscopy were used to characterize the treated HGM. Meanwhile density, water absorption behavior, and mechanical properties of the modified HGM-filled epoxy composites were examined. It is found that the compound coupling agent could effectively improve the interfacial bonding between HGM and the matrix resin. A new chemical bond was formed between HGM and EP, which was confirmed by IR spectroscopy. Compared with their untreated counterparts, the composites treated with the complex coupling agent exhibited excellent mechanical properties, along with lower density and lower water absorption. Graphical abstract The composites prepared by treating hollow glass microspheres with mixed coupling agents showed improved properties in all the cases. The mechanical properties of the composites prepared using No. HGM-1 reached the maximum with tensile strength of 36.38 MPa, tensile modulus of 2.383 GPa, flexural strength of 49.82 MPa, flexural modulus of 1.558 GPa, and compressive strength of 98.14 MPa. Our strategy opens a new way to fabricate composites with enhanced mechanical performances.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 32
·78521-78536
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IF 5.8
Hu Qing-Di,Jiang Hong-Liu,Lam Kwok-Ho,Hu Zhi-Peng,Liu Zhi-Jie,Wang Hua-Ying,Yang Yong-Yu,Baigenzhenov Omirserik,Hosseini-Bandegharaei Ahmad,He Fu-An
The effect of polydopamine (PDA) modification on aminated Fe 3 O 4 nanoparticles (Fe 3 O 4 -NH 2 )/graphite oxide (GO)/β-cyclodextrin polymer cross-linked by citric acid (CDP-CA) composites were studied for the removal of a cationic dye (methylene blue, MB) and an anionic dye (Congo red, CR) from waters. The micro-structural and magnetic characterizations confirmed the successful preparation of Fe 3 O 4 -NH 2 /GO/CDP-CA and PDA/Fe 3 O 4 -NH 2 /GO/CDP-CA composites. The maximum MB and CR adsorption capacities of Fe 3 O 4 -NH 2 /GO/CDP-CA were 75 mg/g and 104 mg/g, respectively, while the corresponding amounts for PDA/Fe 3 O4-NH 2 /GO/CDP-CA composite were 195 mg/g and 64 mg/g, respectively. The dye sorption behaviors of these two composites were explained by their corresponding surface-charged properties according to the measured zeta potential results. Moreover, the high saturation magnetizations and the stable dye removal rate in the adsorption–desorption cycles indicated the good recyclability and reusability of the fabricated composites. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 14
·1-13
·
IF 2.8
Hou Enhui,Kong Zhiguo,Wu Jianfeng,Wang Hairui,Nie Ping,Lu Ming,Chang Limin
Mxenes, a general term for a novel class of two-dimensional carbon–nitrogen compounds, which attracted extraordinary attention because of their unique electrochemical property. In this paper, an Ag-TiO 2 /MXene composite material was prepared for paraquat (PQ) detection by differential pulse voltammetry (DPV). It was found that the detection limit reached as low as 0.01 μM and linear range was from 0.05 to 15 μM (split into two sections: 0.05 to 1 μM and 1 μM to 15 μM). The Ag-TiO 2 /MXene composite electrode material exhibits excellent anti-interference properties to the species including the ions such as Cu 2+ , Na + , Ca 2+ , Zn 2+ , Cl − , SO 4 2− and biomass molecules such as glucose, ascorbic acid and uric acid. In the presence of organophosphorus pesticides, the electrode also showed good anti-interference. The excellent paraquat detection capability of the Ag–TiO 2 /MXene electrode material should be attributed to the synergistic effect obtained by decorating Ag and TiO 2 on MXene. In conclusion, the functionalization of MXenes through surface-modification provided a feasible route for ultrasensitive electrochemical sensors construction.
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Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 4
·2021-2037
·
IF 1.8
Wang Zhongze,Shi Haonan,Shu Sihao,Zhang Xing,Feng Shangzhen,Chen Jixiang
A series of Ni x In y -BTC metal organic frameworks (x/y denotes the Ni/In atomic ratio) were prepared through the solvothermal method, and then carbonized at 400–700 °C in a N 2 flow followed by the H 2 reduction at 550 °C to prepare carbon-coated Ni–In IMCs catalysts. It has been found that the H 2 reduction is favorable for the formation of Ni–In IMCs and the Ni–In IMCs phases in Ni x In y @C are determined by the Ni/In atomic ratio. Interestingly, a thin layer of carbon (~ 2 nm) coats the Ni–In IMC particles. NiIn 3 C 0.5 IMC forms in Ni 2 In 1 @C, and its crystallite size increases with carbonization temperature. In addition, raising the carbonization temperature promotes the degree of graphitization. In in-situ aqueous phase selective hydrogenation of methyl palmitate to hexadecanol using methanol as hydrogen donor, all the NiIn 3 C 0.5 IMC, NiIn IMC and Ni 2 In 3 IMC dominatingly give hexadecanol, however, Ni 2 In 3 IMC is hydrothermally unstable. Therein, Ni 2 In 1 @C carbonized at 600 °C (i.e., Ni 2 In 1 @C-600/550) exhibits the best performance with the hexadecanol yield of 90.3%, and the hexadecanol yield maintains ~ 90% during 5 times recycling. Such high activity and stability are ascribed to stable NiIn 3 C 0.5 IMC phase, thin carbon layer and suitable degree of graphitization in Ni 2 In 1 @C-600/550.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 18
·1-15
·
IF 2.8
Shi Haofan,Li Jinping,Zhang Gaoming,Meng Songhe
SiCN ceramic is a candidate material for high-temperature sensors because of its stability and semiconductor characteristics at high temperatures. The free carbon content within the SiCN ceramics is a main factor that affects its conductivity. This study adjusted the free carbon content inside amorphous SiCN by adding divinylbenzene into the precursor. The electrical properties of SiCN ceramics with different free carbon contents were explored using ultraviolet fluorescence spectrum and temperature-resistant experiments. The results showed that with the increase of divinylbenzene from 0 to 20%, the conductivity of SiCN ceramics at room temperature increases from 2.77 × 10 −9 to 3.66 × 10 −4 S/cm, and the forbidden bandwidth decreases from 3.81 to 2.25 eV. At the same time, the increase of divinylbenzene content would promote the hybridization extent of free carbon from sp 3 to sp 2 and improve the degree of order. This work could pave the way for applying amorphous SiCN serving as temperature sensors.
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 7
·1-18
·
IF 2.9
Liu Xiaokai,Li Xilin,Zhao Baiyun,Zhou Lijuan,Wang Li
Salix is an abundant renewable resource with wide sources and low cost. Therefore, a magnetic fiber membrane adsorbent for removing tetracycline (TC) in water was prepared from Salix wood powder. The optimum preparation conditions were discussed, and the optimum initial TC concentration, pH value, adsorption temperature, and adsorption time were determined. In the meantime, the maximum adsorption amount reached 538.73 mg·g −1 . The adsorption process belongs to the multi-molecular layer adsorption with chemical adsorption as the main factor and physical adsorption as the auxiliary factor. The adsorption process is mediated by multiple mechanisms including intramolecular diffusion, electrostatic interaction, hydrogen bonding, and chemical ion exchange, and the adsorbent was easy to separate from water. The results show that the magnetic cellulose membrane is a promising adsorbent which deserves further study. Graphical Abstract
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 3
·695-700
·
IF 1.6
Yu Yangjian,Liu Peng,Wang Fazhou,Hu Chuanlin
A simple and effective superhydrophobic mesh was designed and made to separate oil-water mixture. Alkali-activated fly ash reacted with 1-bromooctadecane to prepare superhydrophobic modified fly ash (MFA) with low surface energy through Williamson ether synthesis. The MFA powder was then coated uniformly on a stainless steel mesh (SSM) along with the epoxy resin E44 and curing agent T31 to give the superhydrophobic MFA-modified stainless steel mesh (MFA-SSM). The MFA-SSM has a high static water contact angle (CA) of 150.1° and can separate various oil or organic solvent from water with >95% separation efficiency. The oil-water separation efficiency remained high after 30 runs of petroleum ether/water separation. The developed superhydrophobic stainless steel mesh is expected to have wider use in oil-water separation.
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BMC Medicine
·
2023
·Vol. 21
·期 1
·1-17
·
IF 9.3
Li Wenwen,Pang Yana,Wang Yan,Mei Fan,Guo Mengmeng,Wei Yiping,Li Xinyue,Qin Wei,Wang Wei,Jia Longfei,Jia Jianping
Background The identification of pathogenic mutations in Alzheimer’s disease (AD) causal genes led to a better understanding of the pathobiology of AD. Familial Alzheimer’s disease (FAD) is known to be associated with mutations in the APP, PSEN1, and PSEN2 genes involved in Aβ production; however, these genetic defects occur in only about 10–20% of FAD cases, and more genes and new mechanism causing FAD remain largely obscure. Methods We performed exome sequencing on family members with a FAD pedigree and identified gene variant ZDHHC21 p.T209S. A ZDHHC21 T209S/T209S knock-in mouse model was then generated using CRISPR/Cas9. The Morris water navigation task was then used to examine spatial learning and memory. The involvement of aberrant palmitoylation of FYN tyrosine kinase and APP in AD pathology was evaluated using biochemical methods and immunostaining. Aβ and tau pathophysiology was evaluated using ELISA, biochemical methods, and immunostaining. Field recordings of synaptic long-term potentiation were obtained to examine synaptic plasticity. The density of synapses and dendritic branches was quantified using electron microscopy and Golgi staining. Results We identified a variant (c.999A > T, p.T209S) of ZDHHC21 gene in a Han Chinese family. The proband presented marked cognitive impairment at 55 years of age (Mini-Mental State Examination score = 5, Clinical Dementia Rating = 3). Considerable Aβ retention was observed in the bilateral frontal, parietal, and lateral temporal cortices. The novel heterozygous missense mutation (p.T209S) was detected in all family members with AD and was not present in those unaffected, indicating cosegregation. ZDHHC21 T209S/T209S mice exhibited cognitive impairment and synaptic dysfunction, suggesting the strong pathogenicity of the mutation. The ZDHHC21 p.T209S mutation significantly enhanced FYN palmitoylation, causing overactivation of NMDAR2B, inducing increased neuronal sensitivity to excitotoxicity leading to further synaptic dysfunction and neuronal loss. The palmitoylation of APP was also increased in ZDHHC21 T209S/T209S mice, possibly contributing to Aβ production. Palmitoyltransferase inhibitors reversed synaptic function impairment. Conclusions ZDHHC21 p.T209S is a novel, candidate causal gene mutation in a Chinese FAD pedigree. Our discoveries strongly suggest that aberrant protein palmitoylation mediated by ZDHHC21 mutations is a new pathogenic mechanism of AD, warranting further investigations for the development of therapeutic interventions.
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NATURE MATERIALS
·
2023
·Vol. 22
·期 8
·958-963
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IF 41.2
Li Mingqiang,Shen Yidi,Luo Kun,An Qi,Gao Peng,Xiao Penghao,Zou Yu
Dislocation motion, an important mechanism underlying crystal plasticity, is critical for the hardening, processing and application of a wide range of structural and functional materials. For decades, the movement of dislocations has been widely observed in crystalline solids under mechanical loading. However, the goal of manipulating dislocation motion via a non-mechanical field alone remains elusive. Here we present real-time observations of dislocation motion controlled solely by using an external electric field in single-crystalline zinc sulfide—the dislocations can move back and forth depending on the direction of the electric field. We reveal the non-stoichiometric nature of dislocation cores and determine their charge characteristics. Both negatively and positively charged dislocations are directly resolved, and their glide barriers decrease under an electric field, explaining the experimental observations. This study provides direct evidence of dislocation dynamics controlled by a non-mechanical stimulus and opens up the possibility of modulating dislocation-related properties.
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Nature Photonics
·
2023
·Vol. 17
·期 8
·694-701
·
IF 35
Mutailipu Miriding,Han Jian,Li Zhi,Li Fuming,Li Junjie,Zhang Fangfang,Long Xifa,Yang Zhihua,Pan Shilie
Phase-matching of light waves is a critical condition for maximizing the efficiency of nonlinear frequency conversion processes in nonlinear optical crystals; however, phase-matching, commonly achieved by tuning birefringence, is often difficult to achieve over a wide wavelength range. Here, full-wavelength phase-matching crystals that can avoid phase-mismatching across the entire optical transparency range are proposed. The anisotropic strength of bonding in the dimension of energy is confirmed theoretically to be the key to the full-wavelength phase-matching ability. We demonstrate that a crystal of guanidinium tetrafluoroborate (C(NH 2 ) 3 BF 4 ) can be phase-matched throughout its entire optical transparency range and is able to generate harmonic light as short as ~193.2 nm, which is close to its deep-ultraviolet cut-off edge. Importantly, this crystal is stable, cheap and efficient compared with commercially available nonlinear optical crystals for generation of 266 nm light. This work lays the foundation for finding a new class of crystals in which the phase-matching wavelength fully covers its optical transparency range, and also provides a high-performance crystal for generating light at 266 nm—the fourth-harmonic of a commercial 1,064 nm laser.
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AAPS PHARMSCITECH
·
2023
·Vol. 24
·期 5
·1-11
·
IF 3.3
Zhang Ying,Chen Jiacai,Zhang Zaiyong,Zhu Huajie,Ma Wuzhen,Zhao Xiangyu,Wang Manli,Wang Caifen,Chen Weidong,Naeem Abid,Zhang Jiwen,Guo Tao,Wu Li
Cyclodextrin metal-organic frameworks (CD-MOFs) exhibit a high structural diversity, which contributes to their functional properties. In this study, we have successfully synthesized a novel type of β-cyclodextrin metal-organic framework (β-CD-POF(I)) that exhibits excellent drug adsorption capacity and enhances stability. Single-crystal X-ray diffraction analysis revealed that β-CD-POF(I) possessed the dicyclodextrin channel moieties and long-parallel tubular cavities. Compared with the reported β-CD-MOFs, the β-CD-POF(I) has a more promising drug encapsulation capability. Here, the stability of vitamin A palmitate (VAP) was effectively improved by the solvent-free method. Molecular modeling and other characterization techniques like synchrotron radiation Fourier transform infrared spectroscopy (SR-FTIR), differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), and nitrogen adsorption isotherm were applied to confirm that the VAP was successfully encapsulated into the channel formed by the dicyclodextrin pairs. Furthermore, the mechanism of stability enhancement for VAP was determined to be due to the constraint and separation effects of β-CD pairs on VAP. Therefore, β-CD-POF(I) is capable of trapping and stabilizing certain unstable drug molecules, offering benefits and application possibilities. Graphical abstract
One kind of cyclodextrin particle with characteristic shapes of dicyclodextrin channel moieties and parallel tubular cavities, which was synthesized by a facile process. Subsequently, the spatial structure and characteristics of the β-CD-POF(I) were primarily confirmed. The structure of β-CD-POF(I) was then compared to that of KOH-β-CD-MOF, and a better material for vitamin A palmitate (VAP) encapsulation was determined. VAP was successfully loaded into the particles by solvent-free method. The arrangement of spatial structure made cyclodextrin molecular cavity encapsulation in β-CD-POF(I) more stable for VAP capture than that of KOH-β-CD-MOF.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-20
·
IF 10.2
Yu Kexiao,Zhou Hang,Xu Yamei,Cao Youde,Zheng Yuanyi,Liang Bing
Malignant bone tumors result in high rates of disability and death and are difficult to treat in terms of killing tumors and repairing bone defects. Compared with other hyperthermia strategies, magnetic hyperthermia has become an effective therapy for treating malignant bone tumors due to its lack of depth limitations. However, tumor cells express heat shock protein (HSP) to resist hyperthermia, which reduces its curative effect. Competitive ATP consumption can reduce HSP production; fortunately, the basic principle of starvation therapy by glucose oxidase (GOx) is consuming glucose to control ATP production, thereby restricting HSP generation. We developed a triple-functional magnetic gel (Fe 3 O 4 /GOx/MgCO 3 @PLGA) as a magnetic bone repair hydrogels (MBRs) with liquid‒solid phase transition capability to drive magneto-thermal effects to simultaneously trigger GOx release and inhibit ATP production, reducing HSP expression and thereby achieving synergistic therapy for osteosarcoma treatment. Moreover, magnetic hyperthermia improves the effect of starvation therapy on the hypoxic microenvironment and achieves a reciprocal strengthening therapeutic effect. We further demonstrated that in situ MBRs injection effectively suppressed tumor growth in 143B osteosarcoma tumor-bearing mice and an in-situ bone tumor model in the rabbit tibial plateau. More importantly, our study also showed that liquid MBRs could effectively match bone defects and accelerate their reconstruction via magnesium ion release and enhanced osteogenic differentiation to augment the regeneration of bone defects caused by bone tumors, which generates fresh insight into malignant bone tumor treatment and the acceleration of bone defect repair.
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