JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 4
·1854-1864
·
IF 3.442
Zhang Zhizhong,Li Liang,An Duo,Li Hanxue,Zhang Xinghua
Novel triazine-based covalent organic polycalix[4]arenes, CalCOPs, were synthesized via the copolymerization of calix[4]arene derivatives and 2,4,6-trichloro-1,3,5-triazine (TCT) or 2,4-dichloro-1,3,5-triazine (DCT). The resulting CalCOPs have permanent pores that can be regulated by the variation of the alkyl chain lengths of the calixarene backbones and the reaction sites. With the alkyl chain length at the low rim in calixarene units increasing from ethyl to butyl during the reaction, the Brunauer–Emmett–Teller surface areas decrease with surface areas of 280, 31.5, 18.4 and 1.6 m 2 g −1 obtained for CalCOP1, CalCOP2, CalCOP3 and CalCOP4, respectively. Among these CalCOPs, CalCOP1 shows ultrahigh absorption for iodine capture in a water solution with an uptake of up to 232 wt%. Furthermore, the adsorption and release efficiency of iodine were obtained by using the UV–Vis spectroscopy. In addition, these polymers can be recycled at least five times while maintaining high removal capacity, suggesting that CalCOPs are ideal absorbent materials for reversible iodine capture in the mitigation of environmental issues.
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
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2019
·Vol. 96
·期 1
·69-79
·
IF 1.429
Duan Nannan,Ye Lin,Zhang Ai-ying,Feng Zeng-guo
Abstract A series of PPR-based multiblock copolymers were prepared by using a PPR self-assembled from a distal 2-bromoisobutyryl end-capped ferrocenyl containing derivative Br-TEG-Fc-TEG-Br with 4 β-CDs as initiator to initiate the in situ ATRP of NIPAAm in aqueous solution at room temperature. After the ATRP, about 2 β-CDs were resided on the polymeric backbone through a 7 day dialysing purification, but those β-CDs were all slipped off the polymeric chain through a further 7 day dialysing treatment. It suggested that the resulting multiblock copolymers are really the PPR-based instead of the PR-based ones showing an impeded dethreading behavior of β-CDs and the PNIPAAm blocks attached are not bulky enough as polymeric stoppers to end-cap the β-CD-TEG-Fc-TEG PPRs into the PR-based multiblock copolymers. Graphic abstract A series of PPR-based multiblock copolymers were prepared by using a PPR self-assembled from Br-TEG-Fc-TEG-Br with 4 β-CDs as initiator to initiate the aqueous ATRP of NIPAAm. After the polymerization there are about 2 β-CDs still entrapped on the polymeric chain through a 7 day dialyzing purification. Those threaded β-CDs are all slipped off the polymeric backbone through a further 7 day dialyzing treatment.
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MICROCHIMICA ACTA
·
2019
·Vol. 187
·期 1
·1-10
·
IF 5.479
Sun Yuanling,Dai Yuxue,Zhu Xiaodong,Han Rui,Wang Xueying,Luo Chuannan
A nanocomposite was prepared from a bifunctionalized ionic liquid, chitosan on magnetic nanoparticle-modified graphene oxide (IL/Chit@MGO). It was used in a chemiluminescencc (CL) assay for tetracycline. The materials were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray powder diffraction, nitrogen adsorption-desorption isotherm, vibrating sample magnetometry and zeta potentials. Subsequently, a tetracycline-binding aptamer (TC-Apt) acting as a recognition element, and G-quadruplex DNAzyme (G-DNAzyme) acting as a signal amplification component were modified on IL/Chit@MGO. So, the bifunctional G-DNAzyme/TC-Apt/IL/Chit@MGO was prepared. The IL/Chit@MGO is found to possess excellent loading capability for TC-Apt. This is attributed to the large specific surface and abundant charge on the surface of IL/Chit@MGO. The composite was used to construct a CL assay for tetracycline. Tetracycline binds to TC-Apt and causes the release of the G-DNAzyme. The latter catalyzes the CL of luminol-H 2 O 2 CL system at pH 7.4. Under optimized conditions, the blue CL at the emission wavelength of 425 nm increases linearly in the 0.16 pM to 2.0 nM concentration range, and the detection limit is 21 fM (at 3σ). The assay is selective, reproducible and stable. The assay was applied to tetracycline detection in practical samples. The apparent recoveries are 98.0% to 101.3% for the milk sample and 97.0% to 102.2% for the water sample.
G-quadruplex DNAzyme (G-DNAzyme) and tetracycline aptamer (TC-Apt) bifunctionalized ionic liquid/chitosan@magnetic graphene oxide (IL/Chit@MGO) was prepared. The nanocomposite was used to construct a chemiluminescence (CL) assay for tetracycline.
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高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-15
·
IF 11.878
Li Jun,Liu Xiangmei,Tan Lei,Cui Zhenduo,Yang Xianjin,Liang Yanqin,Li Zhaoyang,Zhu Shengli,Zheng Yufeng,Yeung Kelvin Wai Kwok,Wang Xianbao,Wu Shuilin
The application of photothermal therapy to treat bacterial infections remains a challenge, as the high temperatures required for bacterial elimination can damage healthy tissues. Here, we develop an exogenous antibacterial agent consisting of zinc-doped Prussian blue (ZnPB) that kills methicillin-resistant Staphylococcus aureus in vitro and in a rat model of cutaneous wound infection. Local heat triggered by the photothermal effect accelerates the release and penetration of ions into the bacteria, resulting in alteration of intracellular metabolic pathways and bacterial killing without systemic toxicity. ZnPB treatment leads to the upregulation of genes involved in tissue remodeling, promotes collagen deposition and enhances wound repair. The efficient photothermal conversion of ZnPB allows the use of relatively few doses and low laser flux, making the platform a potential alternative to current antibiotic therapies against bacterial wound infections.
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PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2019
·Vol. 323
·期 1
·213-222
·
IF 1.186
Huang Yan-Jun,Guo Gui-Yin,Chen Chao-Feng,Yang Li-Tao,Shang-Guan Zhi-Hong,Sha Xiang-Dong,Yao Jian-Lin,Hu Chen
Based on the requirements of the lower detection limit for the low-volume gaseous effluent, we have designed an automatic separation apparatus of krypton (Kr). The principle of the apparatus is based on both the adsorption and desorption mechanism in the traps with the activated carbon particles and gas chromatography with 5A molecular sieves. The separation efficiency and overall recovery rate could be maintained at about (90.4 ± 4.2)% and (24.3 ± 1.3)%. The 85 Kr could be radioassayed on a liquid scintillation counter following the automatic separation and loading into the cryogenic count vial. The detection limit based the low-volume of 3 L is about 9.5 Bq m −3 , and the expanded relative uncertainties are in the range of 13–18% for typical measurements.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 10
·1-8
·
IF 1.784
Cui Yongping,Shang Yaru,Shi Ruixia,Che Quande,Wang Yingzi,Yang Ping
The effects of calcination temperature, precursor content, holding time and heating rate on the morphology of WO 3 nanofibers (NFs) prepared by electrospinning technology have been investigated systematically. The X-ray diffraction (XRD) patterns using Rietveld method indicated that average crystalline sizes of nanoparticles of WO 3 NFs increase with increasing calcination temperature. Also, the crystallinity of the nanofibers increases with the rise of calcination temperature. The suitable precursor contents and holding time facilitate the formation of continuous and uniform NFs. The samples prepared by different heating rates showed that the WO 3 NFs fabricated with heating rate of 5 °C/min possess the smallest and uniform nanoparticle sizes. The X-ray diffraction (XRD) patterns using Rietveld method exhibited that different heating rate had no significant influence on the crystallinity of WO 3 NFs. Additionally, the experimental results of photocurrent responses and electrochemical impedance indicate that the WO 3 NFs prepared by different heating rate have different photoelectrochemical performances.
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JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 12
·7960-7969
·
IF 1.676
Huang Yanyan,Wu Zunyi,Zhao Guangying,Dou Wenchao
In this study, we used gold nanoparticles (AuNPs) modified screen-printed carbon electrodes (SPCE) with a large area working electrode for the detection of Escherichia coli O157:H7 ( E. coli O157:H7) in a direct method by antigen–antibody specificity binding. We compared four SPCE with different working electrode diameters (2 mm, 2.5 mm, 3 mm and 3.5 mm) to choose the optimum one. After electrodepositing chloroauric acid (HAuCl 4 ) on SPCE, a working electrode diameter of 3.5 mm SPCE show the maximum signal. Cyclic voltammetry and electrochemical impedance spectroscopy were used to characterize the electrochemical sensor. With the combination of large area working electrode and the great property of AuNPs, this immunoassay plays an ideal detection range from 1.19 × 10 3 CFU mL −1 to 1.19 × 10 9 CFU mL −1 and the limit of detection is 5.94 × 10 2 CFU mL −1 (equivalent to 3.5 CFU) at a signal-to-noise ratio of 3. The immunoassay showed the acceptable specificity, reproducibility, and stability for detection of E. coli O157:H7. These results indicate that this immunoassay has a promising application in the food safety industry.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 38
·期 4
·349-356
·
IF 2.804
Yang Bo,Du Jian-Zhong
Noninvasive ultrasound is a more effective strategy for on-demand drug delivery of polymeric nanoparticles than many other stimuli. However, the preparation of ultrasound-responsive homopolymer nanoparticles is still very challenging. In this study, we disclose the regulating factors of ultrasound responsiveness of homopolymer nanoparticles and the disaggregation behavior of homopolymer nanoparticle aggregates. Homopolymer nanoparticles such as vesicles and large compound micelles (LCMs) are self-assembled from poly(methoxyethyl methacrylate) (PMEMA) and poly(amic acid) (PAA), respectively. The ultrasound responsiveness of PAA vesicles at metastable state could be regulated by tuning the self-assembly temperature ( T s ), and was optimized when T s is around the glass transition temperature ( T g ) of PAA. However, the PMEMA LCMs did not respond to ultrasound as they are at stable state. On the other hand, poly(2-(2-ethoxyethoxy)ethyl acrylate) (PEEA) could self-assemble into vesicle aggregates or complex micelle aggregates, which were dissociated upon sonication. Overall, the above findings provide us with a fresh insight for designing ultrasound-responsive polymeric nanoparticles.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-16
·
IF 17.694
Meng Yun,Chen Lijie,Chen Yang,Shi Jieyun,Zhang Zheng,Wang Yiwen,Wu Fan,Jiang Xingwu,Yang Wei,Zhang Li,Wang Chaochao,Meng Xianfu,Wu Yelin,Bu Wenbo
Bacteria and excessive inflammation are two main factors causing non-healing wounds. However, current studies have mainly focused on the inhibition of bacteria survival for wound healing while ignoring the excessive inflammation induced by dead bacteria-released lipopolysaccharide (LPS) or peptidoglycan (PGN). Herein, a boron-trapping strategy has been proposed to prevent both infection and excessive inflammation by synthesizing a class of reactive metal boride nanoparticles (MB NPs). Our results show that the MB NPs are gradually hydrolyzed to generate boron dihydroxy groups and metal cations while generating a local alkaline microenvironment. This microenvironment greatly enhances boron dihydroxy groups to trap LPS or PGN through an esterification reaction, which not only enhances metal cation-induced bacterial death but also inhibits dead bacteria-induced excessive inflammation both in vitro and in vivo, finally accelerating wound healing. Taken together, this boron-trapping strategy provides an approach to the treatment of bacterial infection and the accompanying inflammation.
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Microfluidics and Nanofluidics
·
2022
·Vol. 26
·期 11
·1-9
·
IF 3.09
Niu Bing-Su,Wang Yu-Hang,Lv Shuang,Yang Yu,Fang Fang,Song Yan-Yan,Wu Zhi-Yong
Charged components can be effectively separated and enriched based on ion concentration polarization (ICP) effect for sample clean up and enhancement of detection sensitivity in analytical chemistry. Concerning the role of electrolyte, current studies on electrokinetic stacking with ICP mainly focused on the ionic strength, and the knowledge about the type of supporting electrolyte (SE) is still poor. In this study, the significance of acid–base property of SE was systematically investigated based on an ICP interface established on a paper fluidic device with ion exchange membrane. Using colored ion probes for visualization of the effects, the ion depletion zone as the working area was applied for electrokinetic stacking. It has been shown that, besides the proper electroosmotic flow and ionic strength decided by neutral salt, the acid–base property of SE plays an important role for a successful stacking with ICP. The guideline for SE selection was proposed, and the mechanism was well explained by correlating the water dissociation effect and electric field/pH gradient (double gradients) at the ion depletion zone. This rule proposal is substantial for the design and operation of electrokinetic enrichment and separation of targeted species using ICP effect.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 52
·期 1
·402-413
·
IF 2.047
Liu Xinru,Yang Jianwei,Bian Zhentao,Zhao Xuanxuan,Zhu Yanyan,Wang Hongyan,Song Lei,Chu Juncai,Zhang Ying,Ye Ziyan
Biomass waste carbon sources enjoy a place of pride because of their low-cost, environmentally friendly, and readily available nature. The development of an efficient approach to transform biomass wastes into functional carbon-based electrode materials is a hot topic. However, the production process of biologically-based activated carbon needs to be further improved. Here, discarded badminton shuttlecock feathers were used as precursor via activation with potassium ferrate (K 2 FeO 4 ) to prepare hierarchical porous carbon. The obtained carbon material with hierarchical pore structure displays a high specific surface area ( S BET ) of 1279.5 m 2 g −1 , large total pore volume ( V total ) of 0.73 cm 3 g −1 ,and high-level hetero-atom doping (N: 3.78 at.%, O: 7.5 at.%, S: 3.85 at.%). Experimental results reveal that the as-prepared FPCB-750–1:3 exhibits an excellent specific capacitance ( C g ) of up to 449 F g −1 at the current density of 0.1 A g −1 . Moreover, even at 10 A g −1 , the FPCB-750–1:3 electrode still presents a high capacitance of 216 F g −1 . In addition, the energy density (ED) of the FPCB-750–1:3//FPCB-750–1:3 symmetric cell reaches 56 Wh kg −1 at a power density (PD) of 720 W kg −1 in an aqueous electrolyte (1 M Na 2 SO 4 ), meanwhile maintaining a high-class long-term electrochemical stability (fading lower than 4% after 10,000 cycles of charging and discharging). This study provides a trustworthy method to produce promising electrode materials from waste biomass for high-performance supercapacitors.
Graphical Abstract
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 3
·334-344
·
IF 3.815
Zhao Chun-Xia,Guo Min,Mao Jie,Li Yun-Tao,Wu Yuan-Peng,Guo Hua,Xiang Dong,Li Hui
Flexible hydrogels have shown promise as strain sensors in medical monitoring, human motion detection and intelligent robotics. For a hydrogel strain sensor, certain challenges need to be urgently addressed for practical applications, such as the damage caused by external effects, leading to equipment failure, and the inability to perceive ambient temperature, resulting in single functionality. Herein, a stretchable, self-healing and dual temperature-strain sensitive hydrogel, with a physically-crosslinked network, is designed by constructing multiple dynamic reversible bonds. Graphene oxide (GO) and iron ions (Fe 3+ ) act as dynamic bridges in the cross-linked network and are mediated by the covalent and hydrogen bonding, rendering excellent stretchability to the hydrogel. The reversible features of coordination interactions and hydrogen interactions endow excellent recoverability and self-healing properties. Moreover, the incorporated N -isopropyl acrylamide (NIPAM) provides excellent temperature responsiveness to the hydrogel, facilitating the detection of external temperature changes. Meanwhile, the hydrogels exhibited strain-sensitivity, with a wide working range of 1%–300%, fast response and electrical stability, which can be used as flexible sensors to monitor body motions, e.g. , speaking and the bending of finger, wrist, elbow and knee. Overall, the hydrogel possesses dual sensory capabilities, combining external temperature and strain, for potential applications in wearable multifunctional sensing devices.
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