JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 16
·11253-11264
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IF 2.993
Chen Xiaodan,Chen Yufang,Jin Tao,He Li,Zeng Yu,Ma Qian,Li Na
To fabricate a superhydrophobic and durable coating, non-fluorine siloxane solution for the coating was successfully synthesized via a facile one-pot method. The wetting properties and morphology of coatings with different concentration and adding time of additives were studied. Under condition of low water content, the coatings’ superhydrophobicity was improved with the increasing amount of ammonia content, water content, and low-surface-energy material (HTMS) content. However, too more ammonia or water or HTMS would sacrifice the coating’s integrality and lead to the cracking of it. The obtained coatings showed good superhydrophobicity and anti-UV property on plain and even curved substrates, including glass, metal, and polymer. Contact angle and sliding angle of the coating could reach 158° and 1.8°, respectively. What is more, coating on PET filter could be used for oil/water separation with an efficiency of 80%.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 24
·16263-16275
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IF 2.993
Li Jiali,Kong Xianggui,Jiang Meihong,Lei Xiaodong
Up to now, although tremendous effort has been made in exploring Pd-based catalysts for the Suzuki–Miyaura coupling reactions, there is still much room to enhance its catalytic performance by synthesis catalyst with define-designed and tailored structure. Herein, a new kind of Pd-based structured catalyst with hierarchical hollow structure (Pd/Co(OH) 2 /Cu(OH) 2 /copper foam) has been successfully synthesized by three facile steps. As framework, the hierarchical hollow nanoarray structure of Co(OH) 2 /Cu(OH) 2 /copper foam is fabricated by immersion and electrolytic deposition methods. Uniformly dispersed Pd nanoparticles with a narrow size distribution (1.5 ± 0.2 nm) are anchored on the surface of the hierarchical nanotube array through an in situ spontaneous redox reaction between Co(OH) 2 and PdCl 4 2− without any surfactant at room temperature. Compared with other synthesis approaches, it just takes less than 1 h for the whole fabrication process in our strategy, exhibiting very high efficiency. In order to evaluate the catalytic performance of the as-prepared structured catalyst, 16 kinds of reagents were chosen as substrates for Suzuki–Miyaura coupling reaction, exhibiting excellent activity and reusability under mild conditions. We hope this simple and efficient method will open a new strategy to design and prepare structured catalysts.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2018
·Vol. 87
·期 2
·455-463
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IF 1.745
Jiang Chi,Liu Weiqu,Yang Maiping,He Sha,Xie Yankun,Wang Zhengfang
Abstract Superhydrophobic coatings were successfully fabricated on cotton textiles through a simple one-step sol–gel process. A fluorinated copolymer (PHFA-MPS), as a precursor in the sol–gel reaction, was prepared by copolymerization of hexafluorobutyl methacrylate (HFA) and 3-methacryloxypropyltrimethoxysilane (MPS) as monomers. Then, the fluoro-containing silica sols were formed by alkaline hydrolysis of tetraethylorthosilicate (TEOS) and PHFA-MPS solution in an ethanol solution, which was used to impart the cotton textiles with excellent superhydrophobicity via a facile dip-coating method. The effects of ammonium hydroxide solution (NH 4 OH) and PHFA-MPS concentration on the structure of the fluoro-containing silica sols, as well as the wetting behavior, surface morphology, and surface composition of the as-prepared cotton textiles were characterized. The results show that the resultant cotton textiles exhibited excellent superhydrophobicity with a WCA of 153.4° and satisfied stability, which offers a simple procedure to generate the superhydrophobicity on cotton textiles for use in a wide range of fields.
A series of fluoro-containing silica sols were prepared through ammonium hydroxide catalyzed sol–gel reaction with tetraethylorthosilicate and a fluorinated copolymer as precursors. The fluoro-containing silica nanocomposites imparted excellent superhydrophobicity to the cotton textile.
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Journal of Food Measurement and Characterization
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2018
·Vol. 12
·期 4
·2475-2483
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IF 1.181
Zhang Yao,Sang Jie,Chen Fang-fang,Sang Jun,Li Cui-qin
This study aimed to develop a green approach for extraction and determination of anthocyanins from Hibiscus sabdariffa calyx using a hydroxypropyl- β -cyclodextrin (HP β -CD)-assisted extraction technique coupled with HPLC-DAD analysis and to investigate the effects of gallic/ferulic/caffeic acids on the stability of H. sabdariffa anthocyanins in beverages. HP β -CD-assisted extraction of total anthocyanins from H. sabdariffa calyx was optimized using a Box–Behnken design-response surface methodology, and extraction at 54 °C for 53 min using HP β -CD aqueous solution (3.7 g/100 mL) gave the maximum extraction yield of total anthocyanins (4.82 ± 0.13 mg/g). A work-safe and rapid HPLC-DAD method was developed for analysing H. sabdariffa anthocyanins using ethanol and a tartaric acid aqueous solution as mobile phases, and the main anthocyanin peaks were determined as delphinidin-3- O -sambubioside and cyanidin-3- O -sambubioside using a two-dimensional HPLC-DAD/ESI-MS method. Method validation showed that the developed method was accurate, stable and reliable for the analysis of H. sabdariffa anthocyanins. Additionally, the degradation of delphinidin-3- O -sambubioside, cyanidin-3- O -sambubioside and total anthocyanins from H. sabdariffa calyx ideally followed a first-order model ( R 2 > 0.98) in beverages alone or with additional phenolic acids. Gallic acid improved the stability of H. sabdariffa anthocyanins better than ferulic and caffeic acids, and adding/increasing ferulic and caffeic acids accelerated anthocyanin degradation.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2018
·Vol. 317
·期 2
·701-714
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IF 1.181
Zhang W.,Tan N.,Hou D.,Lin Y. W.,Yan X. M.,Gao Y.,He D. X.,Jiang M.,Wang J.
Uranyl ion-imprinted polymers (U(VI)-IIPs) were successfully prepared by combining phytic acid as the functional monomer, uranyl ion (UO 2 2+ ) as the template, and tetraethyl silicate (TEOS) as the cross-linker with the marine facultative fungus Fusarium sp. #ZZF51 addicted to U (VI) mycelium through the ion-imprinted sol–gel method. Single-factor experiments were performed to optimize the preparation conditions and the prepared materials were better characterized with FTIR, SEM and BET meter. The optimum adsorption conditions were explored by single-factor experiments and BBD response surface method in detail. The adsorption–desorption recycling and adsorption selectivity experiments revealed that U(VI)-IIPs had a good stability and selectivity. The U (VI) adsorption process of U(VI)-IIPs was better described by the pseudo-second order kinetic equation and Langmuir isotherm model.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 12
·11576-11583
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IF 2.8
Tang Ting,Yang Chen,Wang Li,Jiang Xianying,Dang Zhi,Huang Weilin
This study quantified the complex stability constants of sulfamethazine (SMT) with cadmium (Cd 2+ ) and lead (Pb 2+ ) under different pH conditions. The UV-Vis spectrophotometer was used for acquiring the complexation data. Results showed that the complex stability constants of SMT with cadmium (Cd 2+ ) and lead (Pb 2+ ) increased as a function of the solution pH. In the investigated pH range, Cd 2+ showed stronger complex affinity with SMT than Pb 2+ . It appeared that cation - π interactions might dominate the complex between SMT with Pb 2+ and Cd 2+ at acid environment, and the covalent bonding might play a major role at neutral environment. Batch adsorption equilibrium experiment showed that the sorption capacity of Cd 2+ on goethite increased from 3.83 to 7.64 mg/g along with the addition of 1 mg/L SMT, indicating SMT can impede the transportation of Cd. In general, this study worked out the complexation constants and clarified the complexation mechanism between SMT with lead and cadmium, while sorption experiment indicated that sorption of Cd onto goethite was enhanced with SMT.
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PubMed
高影响因子
Journal of Orthopaedic Surgery and Research
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2018
·Vol. 13
·期 1
·1-8
·
IF 1.61
Gao Feng,Lv Tian-Run,Zhou Jin-Chun,Qin Xiao-Dong
Background Obesity affects bone health to varying degrees, depending on the skeletal site (weight-bearing or non-weight-bearing) and compartment (cortical or trabecular), and is a risk factor for orthopedic disorders, including bone fractures. However, the effect and mechanisms of obesity on healing of bone fracture is little understood. Methods The healing bone fractures of the tibia in genetically obese mice was evaluated relative to normal mice at weekly intervals for 28 days using X-ray scans, hematoxylin and eosin (H&E) stain, and alcian blue (AB) stain. Plasma concentrations of relevant proteins were also compared via enzyme-linked immunosorbent assay (ELISA). These included calcitonin gene-related peptide (CGRP), fibroblast growth factor (FGF), transforming growth factor beta 1 (TGF-β1), and tumor necrosis factor-α (TNF-α). Results Bone fracture healing was delayed in the obese mice compared with the control group of normal mice, based on X-ray, H&E stain, and AB stain analysis. This was accompanied with significantly low plasma CGRP, FGF, and TGF-β1 (ELISA). However, TNF-α was significantly higher in obese mice compared with the control. Conclusion Bone fracture healing was significantly slower in the obese mice, relative to that of normal mice. The lower levels of CGRP, FGF, and TGF-β, and higher level of TNF-α, observed in obese mice may contribute to this observed delay in fracture healing.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2018
·Vol. 124
·期 7
·1-6
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IF 1.604
Peng Man,Bai Zhongchen,Li Xianji,Zhang Ying,Zhang Zhengping
We present a wide-spectrum photoluminescence (PL) enhancement effect on the multi-heterojunction of ZnSe quantum dots and gold nanoparticles (NPs). The Au/ZnSe heterojunction is fabricated using Langmuir–Blodgett assembling method. The photoluminescence is measured using a 150 nm aperture ultraviolet laser beam spot of a scanning near-field optical microscope. The enhancement of band-gap emission and defect PL, the quenching of the fluorescence are, respectively, observed, which depend on the distance of gold NPs and ZnSe quantum dots. The enhancement of the band-gap emission is ascribed to the local field enhancement induced by the resonant coupling between the excitons of ZnSe and the surface plasmons of gold NPs. The enhancement of the defect PL is a result of the electron trapped by the defect states in the process of transporting electrons from ZnSe QDs to gold NPs due to the increase of the built-in electric field to hinder the electron transfer to gold nanoparticles. In addition, the quenching of the fluorescence is due to the electron transfer from ZnSe quantum dots to gold NPs. Our result opens the possibility of applications in forming uniform optoelectronic heterojunction and in controlling fluorescent efficiency of PL devices.
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MICROCHIMICA ACTA
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2018
·Vol. 185
·期 4
·1-9
·
IF 5.705
Xue Qin,Cao Xuanyu,Zhang Cuiling,Xian Yuezhong
The authors describe an environmentally friendly and fast (~14 min) method for the synthesis of homogeneously distributed fluorescent polydopamine nanodots (PDA-NDs) using KMnO 4 as the oxidant. Alkaline phosphatase (ALP) catalyzes the hydrolysis of ascorbic acid 2-phosphate to release free ascorbic acid which undergoes an in-situ redox reaction with KMnO 4 . Depending on the activity of ALP, more or less KMnO 4 is consumed, and this affects the formation of the PDA-NDs. Based on this finding, a sensitive method was worked out to quantify the activity of ALP via real-time formation of fluorescent PDA-NDs. The fluorometric signal (best measured at excitation/emission peaks of 390/500 nm) is linear in the 1 to 50 mU·mL −1 ALP activity range, and the limit of the detection is as low as 0.94 mU·mL −1 (based on 3 σ/m). The method was successfully applied to the determination of ALP activity in spiked human serum and in MCF-7 cell lysates. It was also applied in a method to screen for inhibitors of ALP.
Schematic of a fluorometric method for the determination of alkaline phosphatase (ALP) activity. The method is based on the in-situ regulation of the formation of fluorescent polydopamine nanodots (PDA-NDs) through the competition between the KMnO 4 -induced polymerization of dopamine and ALP-directed ascorbic acid 2-phosphate (Asc-2P) hydrolysis. AA: Ascorbic acid.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Shao Hong,Xu Dan,Ding Yadan,Hong Xia,Liu Yichun
The authors describe an “off-on” colorimetric and fluorometric assay for the determination of Cu(II). It is based on the use of upconversion nanoparticles (UCNPs) of type NaYF 4 :Yb(III),Er(III) that were functionalized with branched polyethylenimine (BPEI). A color change from colorless to blue occurs within 2 s after addition of Cu(II) to a solution of the modified UCNPs. The color change can be visually detected at Cu(II) concentrations down to 80 μM. The upconversion fluorescence of the modified UCNPs, measured at excitation wavelength of 980 nm, is reduced due to the predominant inner filter effect caused by the formation of the BPEI-Cu(II) complex. Normalized fluorescence intensity drops linearly in the 50 nM to 10 μM Cu(II) concentration range, and the fluorometric detection limit is 45 nM. Both the color and the fluorescence are recovered on addition of EDTA. Excellent selectivity over other metal ions and anions is achieved.
Upconversion nanoparticles of type NaYF4:Yb,Er were functionalized with branched polyethylenimine (UCNP/BPEI) and used in an “off-on” colorimetric and fluorometric assay for Cu(II). The upconversion fluorescence is selectively quenched on addition of Cu(II), and this is accompanied by a rapid colorless-to-blue color switch. The colorimetric changes and quenched fluorescence can be reversed by adding EDTA.
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NPG Asia Materials
·
2018
·Vol. 10
·期 4
·177-189
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IF 7.208
Gao Zhong Feng,Sann Ei Ei,Lou Xiaoding,Liu Renyi,Dai Jun,Zuo Xiaolei,Xia Fan,Jiang Lei
Herein, we demonstrate a contact angle (CA)-based naked-eye point-of-care testing platform with rapid pH-responsive superwettability that can switch between superhydrophilic and superhydrophobic properties for quantitative biosensing. The CA of the droplet on the pH-responsive surface approached ~0° at pH 1 and conversely reached 161.4° ± 6.2° at pH 13. We realized the sensitive detection of the pH, urea, and glucose by monitoring the changes in the CA. The traditional invasive diagnosis of diabetes causes pain and brings the risk of infections, such as acquired immune deficiency syndrome (AIDS), hepatitis B, hepatitis C, and syphilis, to the user. To address this issue, we implemented a method for the non-invasive diagnosis of diabetes in human saliva and urine, which avoided the significant drawbacks mentioned above. The accuracy of this method was demonstrated by comparing the results with those from commercial glucometers and theoretical calculations. Interestingly, we successfully monitored glucose levels in sweat before, during, and after cycling. The sensing performance was barely influenced by the temperature, elevation, and droplet color, illustrating promise for expansion to hundreds of millions of potential customers, especially those with color blindness or color weakness. Given its low cost, lack of instruments, and rapid response (within 1 s), this strategy might overcome the limitations of the mechanical stability and durability of superwettable materials and thus might extend the industrial-scale application of bioinspired superwettable systems.
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Journal of the Iranian Chemical Society
·
2018
·Vol. 15
·期 7
·1561-1568
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IF 1.593
Liu Chunbo,Liu Zhihua,Wang Meng,Yang Yaling
A novel and simple two-step micro-extraction technique combining surfactant-assisted dispersive liquid–liquid micro-extraction and magnetic solid-phase extraction prior to high-performance liquid chromatography was established for analysis of polyphenols including chlorogenic acid, caffeic acid, and scopoletin in tobacco samples. In the developed system, Fe 3 O 4 nanoparticles were synthesized by a one-step chemical co-precipitation method and used to remove hydrophobic substances in tobacco samples by physical adsorption. Low-density solvent (1-heptanol) and cationic surfactant cethyltrimethyl ammonium bromide were employed as extraction solvent and disperser agent, respectively. Under the optimized experimental conditions, a good linearity of the method was obtained over the concentration range from 0.1 to 1000 ng mL −1 for target analytes. The limits of detection ( S / N = 3) were 0.05 ng mL −1 for CGA, 0.10 ng mL −1 for CFA, and 0.12 ng mL −1 for SP, respectively. Finally, the applicability of the developed method was evaluated by extraction and determination of these three phenolic compounds in tobacco samples and satisfactory average recoveries of spiked samples were between 96.6 and 102.7%.
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