CELLULOSE
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2018
·Vol. 25
·期 12
·7017-7029
·
IF 3.809
Guan Qingshun,Song Ruyuan,Wu Weibing,Zhang Lei,Jing Yi,Dai Hongqi,Fang Guigan
Abstract With water-soluble CdTe quantum Dots (QDs) as fluorescent labels and TEMPO-oxidized cellulose nanofibrils (CNF) as matrix, dual-color QD-encoded microspheres were prepared by mechanical spraying, freeze-molding and subsequent electrostatic cross-linking by calcium ion. The entire preparation process was accomplished in aqueous phase without any chemical treatment. The nanocellulose microspheres possessed porous structure and were able to be dispersed stably in water in the form of hydrogels. CdTe QDs were efficiently fixed in the network of intertwined nanofibrils via hydrogen bonding with CNF, making the microspheres to obtain high photoluminescence (PL) intensity and identifiable encoding signals consisting of seven kinds of microsphere arrays. The crystalline structure and chemical composition of both CdTe QDs and CNF were not affected during the preparation process. The comparision of PL behaviors of CdTe QDs and QD-encoded microspheres in different media indicate that CNF matrix provided good protection of QDs and improved the PL intensity and photostability. Graphical Abstract Dual-color CdTe-encoded nanocellulose microspheres were prepared via pure physical process in aqueous phase. The fluorescent microspheres possessed high photoluminescence intensity and identifiable seven kinds of encoding signals. The nanocellulose matrix provided good protection of CdTe QDs and improved the photoluminescence intensity and photostability.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-7
·
IF 5.705
Kong Caiyun,Gao Linna,Chen Zhengbo
An aptamer based assay is described for the colorimetric detection of adenosine. The presence of adenosine triggers the deformation of hairpin DNA oligonucleotide (HP1) containing adenosine aptamer and then hybridizes another unlabeled hairpin DNA oligonucleotide (HP2). This leads to the formation of a double strand with a blunt 3′ terminal. After exonuclease III (Exo III)-assisted degradation, the guanine-rich strand (GRS) is released from HP2. Hence, the adenosine-HP1 complex is released to the solution where it can hybridize another HP2 and initiate many cycles of the digestion reaction with the assistance of Exo III. This leads to the generation of a large number of GRS strands after multiple cycles. The GRS stabilize the red AuNPs against aggregation in the presence of potassium ions. If, however, GRS forms a G-quadruplex, it loses its ability to protect gold nanoparticles (AuNPs) from salt-induced AuNP aggregation. Therefore, the color of the solution changes from red to blue which can be visually observed. This colorimetric assay has a 0.13 nM detection limit and a wide linear range that extends from 5 nM to 1 μM.
Schematic presentation of a colorimetric aptamer biosensor for adenosine detection based on DNA cycling amplification and salt-induced aggregation of gold nanoparticles.
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 9
·4955-4968
·
IF 3.809
Li Weijie,Zhang Fengying,Wang Weiku,Li Yinhui,Liu Yaodong,Lu Chunxiang,Zhang Zhengfang
Abstract
Cellulose was dissolved in LiCl/DMAc solvent system at various concentrations. Using rheological measurements, we observed that the cellulose solution becomes gelled upon heating and jelly-like during cooling. Interestingly, while phase separation occurs during heating (from room temperature to higher) along with a sol–gel transition, and this transition is irreversible, the cooling (from room temperature to lower) induced solution property transition from more viscous to more elastic is completely reversible. The structural changes of cellulose solution during heating and cooling cycles are in situ monitored by infrared spectroscopy, and we found that the temperature of the solution affects the interactions among DMAc, lithium cations, chloride anions, and the hydroxyl groups in cellulose chains. While heating induces phase separation and gelation of cellulose solutions, cooling simply turns the solution into a reversible jelly status. Also, when cellulose concentration increases, the gelation temperature caused by heating becomes significantly lower. Possible mechanisms of the rheological transitions of cellulose/LiCl·DMAc solutions during either heating or cooling are proposed in this study. Graphical abstract
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 10
·5687-5696
·
IF 3.809
Liu Shaojie,Sun Tingting,Yang Desheng,Cao Meng,Liang Huazhe
Abstract Water-soluble polyacrylic acid was prepared by solution polymerization, and then partially acylated by SOCl 2 to give a random copolymer of poly(acrylic acid- co -acryloyl chloride) (P(AA- co -AC)). Through the reaction of acyl chloride groups in P(AA- co -AC) with hydroxyl groups in 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxy (4-OH-TEMPO), the water-soluble TEMPO immobilized copolymer of poly(acrylic acid- co -2,2,6,6-tetramethylpiperidinyloxy-4-yl-acrylate) (P(AA- co -TA)) with different TEMPO loadings were prepared and characterized by Fourier transform infrared spectroscopy and conductometric titration. P(AA- co -TA) was used as a recoverable catalyst instead of free TEMPO for selective catalytic oxidation of cellulose in water. The carboxyl content of oxidized cellulose with P(AA- co -TA) as catalyst was up to 60% of the free TEMPO level. Furthermore, P(AA- co -TA) was easy to recycle by its pH-sensitivity and the activity did not decrease after 4 cycles. Graphical abstract
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高影响因子
RHEOLOGICA ACTA
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2018
·Vol. 57
·期 10
·619-633
·
IF 1.833
Zheng Zhi-Ying,Li Feng-Chen,Wang Lu,Li Xiao-Bin,Zhang Hong-Na,Cai Wei-Hua,Zheng Xin
The rheological properties of seawater with the addition of surfactant additive (cetyltrimethyl ammonium chloride (CTAC)/sodium salicylate (NaSal)) are measured at different temperatures, including shear viscosity and first normal stress difference ( N 1 ). The effects of the temperature, the salts, and CTAC/NaSal concentration on the rheological properties of test solutions are investigated, and the corresponding influence mechanisms are analyzed. It shows that the addition of salt can decrease the shear viscosities of the solutions, and also decrease N 1 and even eliminate the sharp augment of N 1 above a certain shear rate. The growing elasticity can be characterized by the increase of the initial shear rate for shear-thickening inception. High temperature can also remove the sharp increase of N 1 with salt. Nevertheless, the increase of CTAC/NaSal concentration can withstand the elimination of the sharp augment of N 1 .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 28
·28628-28641
·
IF 2.8
Wang Wenbing,Wu Yanqing
Biological clogging in porous media was an important concern in the design of bio-augmented permeable reactive barriers ( Bio - PRBs ) that were used to remediate groundwater with dense non-aqueous phase liquids (DNAPLs). Here, we used laboratory sandbox experiments to develop and calibrate reactive transport models (C1 and C2) simulating 1,1,1-trichloroethane (1,1,1-TCA) change in heterogeneous saturated porous media. The routine (1,1,1-TCA chain kinetic reactions) and subroutine (the relationship between hydraulic conductivity ( K ) and time ( t )) were included in the model computer code. The simulation results suggested that the model C1 had the applicability for simulating contaminant transport and fate in bio-augmented flow field. By using the model C1 which was suitable for constant K condition, the performance of different types of Bio - PRBs was evaluated, and the regularity of contaminants chain kinetic reactions in different heterogeneous saturated porous media was obtained. The results demonstrated that Bio - PRBs in immobilized microorganism ( IM ) protocol were more superior to Bio - PRBs in free microorganism ( FM ) protocol. In addition, by using the model C2 (updated model C1) which was suitable for decreasing K condition, the different and optimized regularity of contaminants transport and transformation was obtained. The results showed that microbial growth which further decreased K was beneficial to preventing the transport of contaminants and accelerating the transformation of contaminants. However, the negative effects of biological clogging on hydraulic conductivity and relative hydraulic conductivity ratio in FM Bio - PRBs were significantly stronger than that in IM Bio - PRBs . Deploying IM Bio - PRBs for groundwater remediation would be much more efficient and meet the design criteria. The research work had guiding significance to engineering and provided consultation for designing and optimizing Bio - PRBs system. To make the design and optimization of Bio - PRBs system convenient, it was very essential to choose the suitable mathematical model (C1 or C2).
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 2
·1654-1664
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IF 2.993
Wang Linyu,Peng Canwei,Yang Han,Miao Longfei,Xu Lijuan,Wang Li,Song Yonghai
A novel Ni@carbon nanocomposites/three-dimensional kenaf stem-derived macroporous carbon (3D-KSCs)-integrated electrode was prepared by calcinating Ni-benzenetricarboxylic acid (Ni-BTC) metal–organic frameworks (MOFs) grown on 3D-KSCs under N 2 atmosphere for electrochemical glucose sensor. Both Ni-BTC MOFs/3D-KSCs and Ni@carbon nanocomposites/3D-KSCs-integrated electrode were studied by scanning electron microscopy and X-ray powder diffraction. These results showed that many flowerlike Ni-BTC MOFs which were composed of sticklike nanostructures were grown on the surface of 3D-KSCs. After calcination under N 2 atmosphere, lots of pearl chain-like nanostructures were formed and uniformly arrayed on 3D-KSC electrode. XRD results confirmed that the Ni-BTC MOFs were successfully transformed into pearl chain-like Ni@carbon nanocomposites. Both electrochemical behaviors and electrocatalytic performances of Ni@carbon nanocomposites/3D-KSCs-integrated electrode were explored. Thanks to its large specific surface area, 3D macropores and special structures, the Ni@carbon nanocomposites/3D-KSCs-integrated electrode showed wide linear range (0.024–1.2 mM) and low detection limit (7.85 μM, S / N = 3) for glucose sensing. Noteworthily, the MOFs/3D-KSCs might be proposed to prepare other nanocomposites for electrochemical biosensing.
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高影响因子
Chemistry Central Journal
·
2018
·Vol. 12
·期 1
·1-7
·
IF 2.284
Jin Guofan,Xiao Fuyan,Liu Ruijiang
(Z,Z’)-1,1′-(4-ortho-Caboranyldimethyl)-bis(2-methoxyphenylethan-1-oxime) intermediate 3 was synthesized by a three-step reaction with a final treatment with base to give a new series of ortho-carboranyl biphenyloxime derivatives (4–8). Compounds 7 and 8 showed high solubility and the in vitro study results revealed high levels of accumulation in HeLa cells with higher cytotoxicity and boron uptake compared to l-boronphenylalanine.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 7
·1-11
·
IF 1.434
Gao Baojiao,Zhang Dandan,Li Yanbin
A special redox surface-initiating system, tertiary aromatic aniline/BPO (benzoyl peroxide, BPO), was constituted at the interface between polysulfone (PSF) microfiltration membrane and an organic solution, in which the monomer glycidyl methacrylate (GMA) and BPO were dissolved, and the graft-polymerization of GMA on the porous membrane of PSF was smoothly carried out by the initiating of the surface initiating system, getting the grafted membrane PSF- g -PGMA, which is a precursor of many functional composite membranes. The microfiltration membrane of chloromethylated polysulfone (CMPSF) was first prepared by the method of immersion-precipitation phase transformation; subsequently the CMPSF membrane was modified with 3-hydroxy-N,N-diethylaniline (HDEA) as reagent, and through the nucleophilic substitution reaction between the chloromethyl group on CMPSF membrane and the hydroxyl group of HDEA, tertiary aromatic aniline group DEA was bonded on the PSF microfiltration membrane, obtaining the modified membrane PSF-DEA; finally, the graft-polymerization of GMA was successfully realizing by the surface-initiating system of DEA/BPO, getting the grafted porous membrane PSF- g -PGMA. The grafted membrane was characterization by FTIR and SEM. The experimental results show that the reaction between the chloromethyl group on CMPSF membrane and HDEA in the solution belongs to unimolecular nucleophilic substitutions. For the graft-polymerization of GMA, the appropriate temperature is 70 °C, the suitable mass percent concentration of GMA in solution is 5%, and the optimal concentration of BPO is 1.5% of monomer GMA mass. For the grafted membrane PSF- g -PGMA prepared under the optimal reaction conditions, the grafting degree of PGMA can reach 0.86 g/cm 2 .
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高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 7
·3913-3925
·
IF 3.809
Zhao Yongsheng,Dang Wanbin,Lu Zhaoqing,Deng Junbo,Hao Yang,Su Zhiping,Zhang Meiyun
Abstract Aramid fiber-based composite paper is widely used as an engineering material that is often used in outdoor environments. This inevitably cause ultraviolet (UV) damage to aramid fibers. In this work, nanotitanium dioxide (nano-TiO 2 ) was introduced to endow the composite a good UV-resistance while nanofibrillated cellulose (NFC) was used to disperse and deposit TiO 2 nanoparticles onto aramid fibers by physical interaction. Firstly, TiO 2 nanoparticles were treated by (γ-aminopropyl) triethoxysilane to achieve abundant amino-groups (–NH 2 ), which can interact with hydroxyl groups (–OH) of NFC. The results showed that NFC can significantly suppress nano-TiO 2 aggregation and result in a well-defined core–shell structure of TiO 2 nanoparticles uniformly coated onto aramid fibers. Also, the bridge effect of NFC and the reinforcing effect of nano-TiO 2 benefit the mechanical properties the aramid/NFC/TiO 2 composite. The maximum tensile index (~ 16.42 N m/g) and maximum tearing index (~ 9.28 mN m 2 /g) of aramid/NFC/TiO 2 composites increase by ~ 43.4 and ~ 26.1% in comparison with the control sample (~ 11.45 N m/g and ~ 7.36 mN m 2 /g), respectively. Meanwhile, the aramid/NFC/nano-TiO 2 composite achieves a good UV-resistant property because of the dominant light-absorbing ability of well-dispersed TiO 2 nanoparticles. Therefore, our work presents a green and damage-free approach to achieve high-performance aramid fiber composite especially with great UV resistance.
Graphical Abstract
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-10
·
IF 5.479
Cong Lili,Liang Lijia,Cao Fanghao,Sun Dan,Yue Jing,Xu Weiqing,Liang Chongyang,Xu Shuping
A high-throughput, dual-channel single cell analytical method is described for the detection of sialic acid (SA) on single cell based on the use of microfluidic droplets integrated with plasmonic imaging and surface-enhanced Raman spectroscopy (SERS) with the assistance of a multifunctional metal nanoparticle-based probe. The multifunctional plasmonic nanoprobe was prepared by modifying silver nanoparticles (AgNPs) with 4-mercaptophenylboronic acid (MPBA) that both warrants SA recognition and acts as a Raman reporter. This nanoprobe is a high-contrast indicator under bright field imaging due to the strong energy loss feature of AgNPs, and also owns possesses a strong SERS enhancement capability toward MPBA. Cells incubated with the plasmonic nanoprobes were isolated in water-in-oil droplets and then were re-dispersed in a chamber array chip. High-precision profiles of SA on a single cell in one droplet were obtained by the bright field imaging and image processing. The SA expression levels on different cell lines (MCF-7, HepG2, SGC and BNL.CL2) traced by SERS spectroscopy were compared. The statistical data among different cell lines confirm that the SA expression levels on cancer cells are much higher than that on normal cells. Single cell analysis further revealed that the cell-to-cell variations are more obvious in cancer cell lines. This study provides a valuable tool for understanding glycan-related biochemical processes.
A high-throughput, dual-channel microfluidic droplet platform succeeded in distinguishing different cancer cell lines at single living cell level integrated with plasmonic imaging and surface-enhanced Raman spectroscopy with assistance of a multifunctional metal nanoparticle-based probe.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 6
·1-10
·
IF 2.009
Wang Wenfang,Liu Jing,Li Xia,Jiang Qinglin,Xu Jingkun,Luo Chan,Liu Peipei,Tan Rongri,Du Yukou,Jiang Fengxing
One-dimensional silver telluride nanowires (NWs) as potential thermoelectric materials have been studied extensively. At present, most of the efforts are focused on p-type silver telluride, while limited works have been achieved on the preparation of n-type silver telluride. Herein, we prepared n-type Te/Ag 2 Te NWs by galvanic exchange reaction and fabricated a nanofilm. As a simple and cost-effective method, galvanic exchange reaction was employed to prepare n-type Te/Ag 2 Te NWs with obtained Seebeck coefficient of − 93.98 μV K −1 . The nanostructure and chemical composition as well as structural phase transition of as-prepared n-type Te/Ag 2 Te NWs were characterized and discussed. Besides, the thermoelectric thin film device consisting of n-type Te/Ag 2 Te nanofilms and p-type Ag-doped Te nanofilms obtained by one-step hydrothermal method was assembled and exhibited accessible output voltage as 65 mV at the 75 K temperature difference, which may provide the fundament for the development of inorganic thermoelectric nanofilm device.
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