CELLULOSE
·
2018
·Vol. 26
·期 2
·1383-1397
·
IF 3.809
Liu Gongyan,Xiang Jun,Xia Qiongfen,Li Kaijun,Lan Tianxiang,Yu Ling
Abstract Common cotton gauze was endowed with both superhydrophobic and antibacterial properties by a dip-coating method that involved sequential deposition of positively charged chitosan (CS), negatively charged gallic acid modified silver nanoparticles (GA@AgNPs) and 1H,1H,2H,2H-perfluorodecanethiol (PFDT) with low surface energy on cotton fabrics. After such surface coating, the wettability of gauze surface was converted from superhydrophilic to superhydrophobic with a water contact angle (CA) of 158 ± 2.2° and sliding angle (SA) of 5.2 ± 1.8°, exhibiting water repellency, antifouling ability as well as bacterially antiadhesive activity. Moreover, such PFDT/GA@AgNPs/CS-coated cotton fabrics showed efficiently antibacterial activities against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), which was mainly attributed to the synergistic effect of contact-killing of CS and continuous release of Ag + . In addition, it was found that the outer PFDT deposition could act as a barrier to prevent leaching of the AgNPs during laundry, enhancing the antibacterial durability. Graphical abstract
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高影响因子
NPG Asia Materials
·
2018
·Vol. 10
·期 7
·618-629
·
IF 7.208
Fu Gengtao,Jiang Xian,Chen Yifan,Xu Lin,Sun Dongmei,Lee Jong-Min,Tang Yawen
The development of highly active air-cathodes with robust stability and a low price is of crucial significance for rechargeable Zn–air batteries and remains a great challenge. Herein, for the first time, we report a “rigid and flexible” material consisting of three-dimensional (3D) porous nickel-manganese oxide (Ni 6 MnO 8 ) coupled with 1D ultrathin Au nanowires (Au-NWs) as an efficient bifunctional oxygen electrocatalyst, adopting α-naphthol-Au(III) as a precursor of Au-NWs and pre-formed Ni 6 MnO 8 as a support. Ni 6 MnO 8 acts not only as a robust carbon-free support that is stable in alkaline electrochemical conditions, but also as a highly active component for the oxygen evolution reaction (OER), while flexible Au-NWs contribute to the excellent oxygen reduction reaction (ORR) activity and act as a flexible conductive electronic network. The coupling of Ni 6 MnO 8 and Au-NWs plays a complementary role in the two types of oxygen electrocatalytic reactions. Accordingly, their advantages have been optimally harnessed while overcoming their deficiencies. Moreover, a Zn–air battery assembled with such a rigid and flexible air-cathode has lower charge and discharge overpotentials and a higher cyclic stability than those with a mixed Pt/C+RuO 2 catalyst.
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高影响因子
CELLULOSE
·
2018
·Vol. 26
·期 3
·1825-1839
·
IF 3.809
Lin Fengcai,Lu Xiangchao,Wang Zi,Lu Qilin,Lin Guanfeng,Huang Biao,Lu Beili
Cellulose hydrogels usually have poor mechanical properties which seriously limit their applications in biomedical or industrial fields. Herein, an interpenetrating polymer network strategy was proposed to construct double network hydrogels composed of cellulose and polyacrylamide with high mechanical strength and pH responsive properties. The synergistic interactions and strong hydrogen bonds between two networks contributed to the dissipation of mechanical energy, as evidenced by the compressive stress–strain and rheology analyses. The compressive strength and compressive modulus for cellulose–polyacrylamide interpenetrating network (C–PAM IPN) hydrogels could reach up to 5.62 and 22.47 MPa, which is nearly 18 and 23 times higher than that of cellulose hydrogels. Moreover, these tough C–PAM IPN hydrogels exhibit pH sensitive properties in various pH solutions. Therefore, this paper provides a general strategy to enhance the mechanical and physical properties of cellulose-based hydrogels, which are potentially useful in developing novel cellulose-based hydrogels and expanding their applications.
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高影响因子
Nano Research
·
2018
·Vol. 12
·期 2
·449-455
·
IF 7.994
Huang Zhulin,Meng Guowen,Hu Xiaoye,Pan Qijun,Huo Dexian,Zhou Hongjian,Ke Yan,Wu Nianqiang
A facile synthetic approach has been developed to prepare uniform and size-tunable spiky Au@Ag core-shell nanoparticles (NPs) to tailor the localized surface plasmon resonance (LSPR) properties. The gradual assembly of small Au nanocrystals allows the size of spiky Au NPs to be modulated from tens to several hundreds of nanometers by tuning the concentration of initial Au seeds and Au source; and the thickness of the Ag shell can be adjusted with stepwise reduction of Ag(I) ions. The LSPR bands of such spiky Au@Ag core-shell NPs resemble those of pure spiky Au NP cores of similar sizes in near-infrared region, and increasing the Ag shell thickness results in a blue shift and broadening of the LSPR band in the near-infrared region. Additionally, the spiky Au@Ag core-shell NPs exhibit improved surface-enhanced Raman scattering (SERS) activity as compared to the bare spiky Au NPs and spherical Ag@Au NPs. This work has offered a facile route to synthesize plasmonic metal NPs with LSPR band in 650 to 800 nm that show strong enhancement of localized electromagnetic field, which provides an effective SERS substrate for SERS imaging and detection in biological fluids and tissues.
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高影响因子
International Journal of Peptide Research and Therapeutics
·
2018
·Vol. 25
·期 4
·1361-1367
·
IF 1.132
Li Songtao,Zhao Hongling,Wang Ruxing,Wang Jianping,Mao Xiaoxia,Hao Ting,Chang Xiaomin,Zhao Enhong,Yin Zhifeng,Deng Shuhua,Yang Yaqi,Wang Huina
It is demonstrated that gonadotropin-releasing hormone (GnRH) analogs can directly inhibit the proliferation of reproductive tissue cancer cells, but the poor pharmacokinetic properties still restrict their application in treating hormone-dependent diseases. Modifications in position 6 and 10 of natural GnRH can improve the metabolic stability. In order to study the effect of incorporation Cys 6 substitution with C-terminal Pro 9 -NHEt modification and dimerization of linear peptides on metabolic stability and antiproliferative activity of GnRH analogs, two new GnRH analogs [ l -Cys 6 , desGly 10 , Pro 9 -NHEt]-GnRH ( 1 ) and [ d -Cys 6 , desGly 10 , Pro 9 -NHEt]-GnRH ( 2 ), and their corresponding dimer derivatives ([ l -Cys 6 , desGly 10 , Pro 9 -NHEt]-GnRH) 2 ( 3 ) and ([ d -Cys 6 , desGly 10 , Pro 9 -NHEt]-GnRH) 2 ( 4 ) were synthesized. Incubation of these analogs with human serum was carried out to evaluate their metabolic stability, and direct growth inhibitory effect of the two dimer derivatives 3 and 4 on MCF-7 human breast cancer cell line was examined by MTT assay. The metabolic stability of dimer derivatives 3 and 4 was remarkably improved in comparison with natural GnRH. The d -Cys 6 substituted dimer derivative 4 exhibited higher inhibitory effect (29.6–39.7% growth reduction) on cell growth than its corresponding counterpart 3 (21.8–26.2% growth reduction) at concentration range of 50, 100 and 200 μΜ. The cell growth inhibition of leuprolide was 16.4–27.2% at the tested concentrations. The dimer derivative 4 was the most stable and active GnRH analog in this study and has the potential for future preclinical investigations as promising antitumor drug candidate.
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高影响因子
Journal of Coatings Technology and Research
·
2018
·Vol. 16
·期 1
·25-30
·
IF 1.619
Li Pengchong,Cai Chao,Long Yuhua,Zhu Tang,Dong Haixia,Zhu Caizhen,Zhao Ning,Xu Jian
Microsized Cu 2 O particles are widely used in tin-free marine antifouling (AF) paints. Because of the enlarged specific surface area, utilization of Cu 2 O particles with smaller sizes is a potential way to improve the AF efficiency and lower the Cu 2 O content. In this paper, the clay, commonly applied as filler in the paint, was previously used to control the concentration of free Cu 2 + during the synthesis of Cu 2 O. With the help of clay, the size of obtained Cu 2 O particles decreased from 750 to 460 nm. It has been shown that the smaller-sized Cu 2 O can work against the marine biofouling with a lower content (15 wt%) compared to the commercial microsized Cu 2 O (40 wt%) in the 260 days of marine AF field tests.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-9
·
IF 5.705
Jiao Zhe,Li Jingwen,Mo Liangji,Liang Jinming,Fan Hongbo
A molecularly imprinted polymer (MIP) was fabricated for selective recognition of the highly persistent pollutant perfluorooctane sulfonate (PFOS). The MIP was prepared from chitosan and doped with fluorescent carbon quantum dots (CQDs). It was characterized by fluorescence spectrophotometry, scanning electron microscopy, and Fourier transform infrared spectroscopy. The fluorescence of the CQDs, best measured at excitation/emission wavelengths of 350/460 nm, is enhanced by PFOS, and the effect is much stronger for the MIP than for the nonimprinted polymer (NIP). The imprinting factor is 2.75. The method has good specificity over sodium dodecyl sulfate (SDS), perfluorooctanoic acid (PFOA), sodium dodecyl sulfonate (SDS’), sodium dodecyl benzene sulfonate (SDBS), perfluorooctanesulfonyl fluoride (POSF), perfluorobutane sulfonate (PFBS) and 1-octanesulfonic acid sodium (OSA). Fluorescence increases linearly in the 20–200 pg·L −1 POSF concentration range in aqueous solution. The method was applied to the determination of PFOS in spiked serum and urine samples. The limits of detection are 66 and 85 pg·L −1 for serum and urine samples respectively. The recoveries ranged from to 81–98%, with relative standard deviations in the range of 1.8–8.2%. Compared with LC-MS/MS, this assay is more convenient since the material can be prepared flexibly and the method can be applied on-site.
Schematic of the fabrication of a molecularly imprinted chitosan hydrogel doped with CQDs for selective fluorometric determination of PFOS. a. The photo of chitosan hydrogel. b, c, d, e represents the hydrogel observed under UV lamp. b’, c’, d’, e’ represents the inner structure of hydrogel bead.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 2
·1692-1702
·
IF 2.993
Pan Jie,Lei Shuaiquan,Chang Lu,Wan Dong
In this study, novel smart pH-sensitive nanoparticles of PLA-mPEG 2000 /TPGS 3350 -PHis-Folate for enhanced effect of chemotherapy are developed. Polyethylene glycol (PEG) is decorated on the surface of nanocarriers in order to prolong the circulation of nanoparticles in blood; the pH-sensitive material of poly( l -histidine) is utilized in nanoparticles for the intelligent purposes: under normal physiological pH, the targeting molecule of folate can be hidden into the layer of PEG in nanoparticles, which closes the active targeting function of nanoparticles; but in weak acid of tumor tissue, poly( l -histidine) is protonated to expose folate on the surface of nanoparticles, opening the active targeting function; next, nanoparticles are internalized by cells via folate receptor-mediated endocytosis; finally, poly( l -histidine) in endosome/lysosome begins to dissociate, leading to quick intracellular drug release. The features of the nanoparticles such as morphology, particle size, drug loading content, in vitro release and in vitro cytotoxicity are further investigated. Nanoparticles designed in this work have multiple functions such as active targeting, long circulation and easy internalization by cells simultaneously, and rapid intracellular drug release, which demonstrates huge potential to apply for the efficient treatment of cancer.
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高影响因子
Microfluidics and Nanofluidics
·
2018
·Vol. 22
·期 12
·1-13
·
IF 2.384
Lian Zheng,Ren Yong,He Jun,Chen George Z.,Koh Kai Seng
In this paper, pristine and two types of porous polydimethylsiloxane (PDMS) microparticles were fabricated using oil-in-water (O/W) single emulsion template by the needle-based microfluidic multiphase system. By manipulating the flow rate of either the dispersed or continuous phase, microparticles of various sizes were obtained. The capillary number of the continuous phase for all flow conditions applied in this study was less than 0.1, suggesting that the flow regime was dripping. The coefficients of variation (CV) of sizes under different flow conditions were less than 1.5% which indicates the particles to be highly monodispersed. The surface morphology and particle size were characterized by optical microscope and scanning electron microscope. Pristine PDMS microparticles (PDMS-P) and PDMS microparticles templated from tetrachloromethane (CCl 4 ) and white granulated sugars (PDMS-C and PDMS-S, respectively) were prepared under the same flow conditions. Subsequently, the microparticles were adopted for treatment of a synthetic wastewater that contained organic compounds such as toluene under static and dynamic states for comparison. The effects including the releasing amount, size of particles, porosity of microparticles and initial concentration of pollutants were investigated based on the toluene concentration variation, which was quantified by a gas chromatograph-headspace sampler (GC-HS). It has been found that 50 mg of porous PDMS microparticles are capable of realising over 65% of toluene removal efficiency of 200 ppm toluene aqueous solution within 2 h. The microparticles were collected and reused 30 times with unchanged treatment capacity.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-12
·
IF 5.705
Xu Cuxing,Hei Yashuang,Liu Jingju,Sun Mimi,Sha Tianze,Wang Nan,Hassan Mehboob,Bo Xiangjie,Zhou Ming
The authors describe a method for synthesis of a three-dimensional (3D) interconnected carbon nanorod aerogel (3D-ICNA) starting from wax gourd ( Benincasa hispida ) which is a low-cost biomass. The 3D-ICNA possesses unique 3D interconnected and porous nanostructure, with abundant edge-plane-like defective sites, a large specific surface area (823 m 2 g −1 ) and a large pore volume (0.12 cm 3 g −1 ). This makes the material attractive in terms of electrochemical sensing. To validate the feasibility, the voltammetric response towards ferricyanide, hydrogen peroxide (H 2 O 2 ), acetaminophen, ascorbic acid (AA), dopamine, uric acid and epinephrine was investigated by using a glassy carbon electrode (GCE) modified with 3D-ICNA. The modified GCE shows higher electron-transfer capacity than a conventional GCE. In addition, as an electrochemical sensor for AA or H 2 O 2 , the electrode exhibits better analytical performance with lower detection limit [3.5 μM for AA or 0.68 μM for H 2 O 2 based on 3σ/m criterion (where σ is the standard deviation of the blank and m is the slope of the calibration plot)], wider linear range and higher sensitivity (0.14, 0.11 and 0.080 μA μM −1 cm −2 for AA or 0.24 and 0.20 μA μM −1 cm −2 for H 2 O 2 ) compared to a plain GCE or a carbon nanotube-modified GCE. The modified GCE exhibits a large potential for the amperometric determination of AA or H 2 O 2 in real samples.
By employing the biomass of wax gourd ( Benincasa hispida ) as the precursor, a three-dimensional interconnected carbon nanorod aerogel was prepared. It is shown to be a viable material for the construction of an advanced electrochemical sensor for H 2 O 2 and ascorbic acid.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 20
·13298-13313
·
IF 3.442
Zhang Liuwei,Qian Ming,Wang Jingyun,Xia Jing,Cui Hongyan,Chen Qixian
Photo-responsive nitrophenyl moieties were proposed to conjugate as pendants of the pullulan backbone through labile carbamate linkage to yield amphiphilic pullulan derivatives. Note that the hydrophobicity of the conjugated nitrophenyl components in the amphiphiles enable facile their self-assembly with the hydrophobic chemotherapeutic drug (doxorubicin) as the internal drug reservoirs, whereas the hydrophilic pullulan segments existed as the biocompatible surroundings. Upon photo-illumination, the carbamate linkage was susceptible to cleavage for departure of the nitrophenyl components from the pullulan backbone owing to the photo-responsive nitrophenyl moieties. Simultaneously, the nitrophenyl components transformed into water-soluble aldehyde-terminalized nitrosophenyl derivatives, leadingly accounting for structural disassembly and liberation of the cytotoxic doxorubicin payloads. Therefore, our proposed photo-responsive strategy could address the reluctant intracellular drug release drawbacks of the conventional amphiphile-based drug delivery systems. Notably, markedly lower IC 50 (half maximal inhibitory concentration) index of our constructed doxorubicin delivery systems was determined to be approximately 1.0 μg/mL upon photo-illumination, in contrast to IC 50 index of 5.6 μg/mL in the absence of photo-illumination (approximate fivefold), thereby representing as a facile spatiotemporal artifice to execute on-demand drug release to the photo-imposed cells.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 8
·1-13
·
IF 2.009
Shu Miao,Li Xing
The specific capacity (781 mAh g −1 ) of SnO 2 as anode materials for lithium-ion batteries (LIBs) is much higher than that of commercial graphite materials (372 mAh g −1 ), which attracts great attention from researchers. In this paper, a series of Mn x Co 0.5− x Sn 0.5 O 2 ( x = 0.00, 0.15, 0.25, 0.35, 0.50) and SnO 2 porous nanofibers and nanoparticles are prepared through a single-spinneret electrospinning technique followed by a calcination process. The electrochemical properties of porous nanofibers and nanoparticles have been measured and discussed, and the results show that porous nanofibers have better performance when doped with manganese and cobalt components. With the increase of manganese contents, the electrochemical capability of the batteries is improved. As a demonstration, the Mn 0.50 Co 0.00 Sn 0.5 O 2 ( x = 0.50) porous nanofibers present the first discharge capacity of 1347.3 mAh g −1 , and after 100 cycles, Mn 0.50 Co 0.00 Sn 0.5 O 2 possesses the higher discharge capacity of 131.6 mAh g −1 when compared with the other materials.
Mn x Co 0.5− x Sn 0.5 O 2 ( x = 0.5) porous nanofibers were prepared through an electrospinning technique with a calcination process, which present the first discharge capacity of 1347.3 mAh g −1 at a current density of 100 mAh g −1 .
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危险品化学品经营许可证（带存储）