MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-8
·
IF 5.705
Lin Haizhu,Chen Hemei,Shao Xi,Deng Chunhui
A zirconium(IV)-based metal organic framework (Zr-MOF) was deposited on polydopamine-coated silica microspheres to form microspheres of type SiO 2 @PDA@Zr-MOF. These were packed into capillary columns for enrichment of phosphopeptides. The column was off-line coupled to both matrix-assisted laser desorption/ionization time of flight mass spectrometry and LC-ESI-MS/MS. The method has a detection limit as low as 4 fmol of β-casein digest and a selectivity as high as 1:1000 (molar ratio of β-casein and BSA digest). It was applied to the analysis of human saliva. In total, 240 endogenous phosphopeptides were identified in only 25 μL human saliva.
A zirconium-based metal organic framework (Zr-MOF) was modified outside of polydopamine-coated silica microspheres to form microspheres named SiO 2 @PDA@Zr-MOF. Then they were packed in capillary columns for selective enrichment of phosphopeptides via interaction between Zr-O clusters and phosphate groups. The pre-concentration resulted in a better detection of phosphopeptides by mass spectrometry. Tris: Tris(hydroxymethyl)aminomethane; DMF: Dimethyl Formamide; Zr-MOF: Zirconium(IV)-organic framework; MOAC: Metal oxide affinity chromatography.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2018
·Vol. 48
·期 10
·1163-1173
·
IF 2.262
Luo Fan,Liu Mingrui,Chi Bin,Dang Dai,Hou Sanying,Liao Shijun,Li Xiuhua,Song Huiyu
Abstract Through decorating commercial Pt/C catalyst with a binary oxide of silicon and tin, a catalyst with significantly enhanced self-humidification capacity and ultra-high stability has been successfully prepared. After 5000 cycles, ECSA and ORR activity decay by only 30% and 28.4%, respectively, for our optimal decorated catalyst, compared with 75% and 99.9% for undecorated Pt/C under the same conditions. We attribute this improvement to the prevention of Pt nanoparticle aggregation and the synergistic effects between the Pt active component and the binary oxide. The decorated catalyst also exhibits excellent self-humidification. Under non-humidified operating conditions, a membrane electrode assembly (MEA) with a decorated Pt/C catalyst anode is discharged at 0.6 V for 8 h with only slight current density decay, whereas serious decay is observed for an MEA with a non-decorated Pt/C anode. The catalysts are characterized using XRD, SEM/TEM, XPS, and contacted angle measurement. We find that the dissolution, migration, and aggregation of Pt nanoparticles can be effectively prevented by decoration with the binary oxide, and that the contact angle is decreased by 56°, indicating great improvement in the catalyst’s wettability. The interactions between Pt and oxide, Sn and Si are revealed by XPS analysis. This work may provide a facile and effective way to address the durability and humidification issues of PEM fuel cells. Graphical Abstract An oxide modified Pt/C catalyst was prepared by decorating the commercial Tanaka Pt/C catalyst with a binary oxide of Sn and Si, the catalyst exhibited significantly enhanced stability/durability, slightly enhanced activity and excellent self-humidification property. The catalysts were characterized with HRTEM, XPS etc. The enhancements should be attributed to the prevention of the coated binary oxide to the aggregation of Pt, the corrosion of carbon support. And self-humidification may be resulted from the wettability of the silicon oxide.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 6
·4719-4731
·
IF 2.993
Feng Daoyan,Yang Hui,Wang Qixuan,Guo Xingzhong
Binary NiCo alloy/carbon composite monoliths with well-defined macropores and mesostructured skeletons have been facilely fabricated by a solgel process followed by heat treatment at Ar atmosphere, and the morphology control, heat treatment and pore structures of the composite monoliths were investigated in detail. Synergic control of phase separation and solgel transition allows the formation of three-dimensional nickel–cobalt hydroxide-based xerogel monoliths with interconnected macropores and co-continuous solid skeletons. Heat treatment at 270–340 °C promotes the precipitation of nickel–cobalt oxides and the pyrolysis of PAA into carbon, and at and above 400 °C, some in situ formed carbon can carbothermally reduce nickel–cobalt oxides to generate the NiCo alloy and form NiCo alloy/carbon composites, without any deterioration of the macrostructure of monoliths. The as-prepared NiCo alloy/carbon composite monolith possesses hierarchical pore structure with a macropore size of 0.5 μm, a mesopore size of 2 nm, a specific surface area up to 167 m 2 g −1 and a porosity as high as 80%. This three-dimensional hierarchically porous binary NiCo alloy/carbon monoliths are promisingly used in wide applications such as catalysis, filtration, separation, sensor.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-14
·
IF 10.2
Zhao Yitong,Bo Tao,Wang Chenfei,Yao Dingjin,Pan Chaolan,Xu Weiyi,Zhou Hao,Li Ming,Zhang Si
Extensive efforts have been dedicated to enhancing the expression of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) in cancer cells for the development of effective cancer treatments. However, highly safe and efficient delivery of TRAIL gene remains a significant challenge, especially using cationic polymers. Here, a series of highly branched-linear poly(β-amino ester)s (H-LPAEs) are developed through a unique oligomer branching strategy. H-LPAEs exhibit a more uniform distribution of linear segments and branching units, leading to excellent DNA condensation and favorable physicochemical properties of H-LPAE/DNA polyplexes. In SW1353 and BMSC cells, the optimized H-LPAEs, H-LPAE B4−S5−TMPTA , achieves superior gene transfection efficiency of 58.0% and 33.4%, which were 2.5-fold and 2.0-fold higher than that of the leading commercial gene transfection reagent, Lipofectamine 3000. Excitingly, H-LPAE B4−S5−TMPTA mediated 56.7% and 28.1% cell apoptosis in HepG2 cells and HeLa cells highlighting its potential application in cancer gene therapy. In addition, locally administered H-LPAE B4−S5−TMPTA delivered TRAIL DNA to HepG2 xenograft tumors and inhibited tumor growth in vivo. This study not only proposes a novel strategy for synthesizing poly(β-amino ester)s with a unique branched-linear topology but also identifies a promising candidate for highly efficient TRAIL gene transfection.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 10
·2629-2636
·
IF 3.307
Yu Huan,Chen Xinfeng,Yu Long,Sun Mingtai,Alamry Khalid A.,Asiri Abdullah M.,Zhang Kui,Zapien Juan Antonio,Wang Suhua
In this study, we have developed a facile method for preparation of highly fluorescent Au nanoclusters (AuNCs) using 11-mercaptoundecanoic acid (MUA) as both the reducing and stabilizing agent. The as-prepared MUA functionalized AuNCs (MUA-AuNCs) have good water solubility, excellent photostability, and strong fluorescence emission at 610 nm with a quantum yield of 7.28% in water. The fluorescence of MUA-AuNCs was first quenched by copper ions through electron transfer, subsequently caused obvious restoration by competitive effect after adding penicillamine, making it a potential fluorescent sensor for penicillamine with a detection limit of 0.08 μM. Furthermore, the newly designed fluorescence “on-off-on” assay was explored for the measurement of penicillamine in complex real water and urine samples with satisfactory results.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 9
·9870-9876
·
IF 1.798
Liu Changbai,Wang Xuesong,Xie Feng,Liu Li,Ruan Shengping
Pure and Sm-doped In 2 O 3 porous nanotubes have been successfully fabricated by the single-capillary electrospinning method followed by calcination. The as-synthesized porous nanotubes were investigated by X-ray powder diffraction (XRD), energy-dispersive X-ray (EDX), scanning electron microscope (SEM), Raman spectra and X-ray photoelectron spectroscopy (XPS). It can be seen in SEM images that the surface of nanotubes is distributed with numerous pores. Gas sensing investigation reveals that Sm-doped In 2 O 3 porous nanotubes possess high-performance formaldehyde sensing properties. The response of gas sensors based on Sm-doped In 2 O 3 porous nanotubes was 54.37 towards 100 ppm formaldehyde at 240 °C, which was 5 times larger than that of pure In 2 O 3 porous nanotubes (10.87). The response and recovery times to 100 ppm formaldehyde were 9 and 40 s, respectively. Moreover, even at low concentration of 100 ppb formaldehyde, a detectable response of 2.1 can be observed. Furthermore, Sm-doped In 2 O 3 porous nanotube gas sensors have excellent selectivity to formaldehyde.
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npj Flexible Electronics
·
2021
·Vol. 5
·期 1
·1-8
·
IF 12.74
Cui Nan,Song Yu,Tan Ching-Hong,Zhang Kai,Yang Xiye,Dong Sheng,Xie Boming,Huang Fei
To achieve adhesive and conformable wearable electronics, improving stretchable transparent electrode (STE) becomes an indispensable bottleneck needed to be addressed. Here, we adopt a nonuniform Young’s modulus structure with silver nanowire (AgNW) and fabricate a STE layer. This layer possesses transparency of >88% over a wide spectrum range of 400–1000 nm, sheet resistance below 20 Ω sq −1 , stretchability of up to 100%, enhanced mechanical robustness, low surface roughness, and good interfacial wettability for solution process. As a result of all these properties, the STE enables the fabrication of a highly efficient ultraflexible wearable device comprising of both organic photovoltaic (OPV) and organic photodetector (OPD) parts with high mechanical durability and conformability, for energy-harvesting and biomedical-sensing applications, respectively. This demonstrates the great potential of the integration of OPVs and OPDs, capable of harvesting energy independently for biomedical applications, paving the way to a future of independent conformable wearable OPV/OPDs for different applications.
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CATALYSIS LETTERS
·
2019
·Vol. 149
·期 8
·2078-2088
·
IF 2.372
He Xiaoxia,Chen Yu,Liu Ya,Fang Lina,Chen Zeng,Ji Hongbing
Abstract A series of metal-modified hierarchical M/H-ZSM-5 catalysts were prepared for catalytic conversion of cellulose in an aqueous medium. Characterization of the catalysts showed that the impregnation of metal into H-ZSM-5 did not change the basic framework and pore structure of H-ZSM-5, but it decreased the total acidity. Analysis of the products indicated that the catalysts significantly affected products distribution. When Co/H-ZSM-5 and Fe/H-ZSM-5 were used as the catalysts, the yields of lactic acid and cyclic ketones obviously increased. At last, a recommendable catalytic transformation pathway of cellulose over M/H-ZSM-5 was proposed on the basis of the obtained experimental results and the published literatures. Graphical Abstract In this paper, a series of metal-modified hierarchical M/H-ZSM-5 (M = Ce, Co, Ga, and Fe) catalysts were prepared and employed in catalytic conversion of cellulose in aqueous media to examined the products distribution of cellulose catalytic conversion. Based on our results and previous works, the plausible general reaction pathways of cellulose over M/H-ZSM-5 were proposed.
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Photonic Sensors
·
2019
·Vol. 10
·期 2
·97-104
·
IF 1.12
Tang Yiwen,Yuan Hui,Chen Jiangping,Xing Qiguo,Su Rongxin,Qi Wei,He Zhimin
We present a facile and effective method for fabrication of the localized surface plasmon resonance (LSPR) optical fiber sensor assisted by two polydopamine (PDA) layers with enhanced plasmonic sensing performance. The first PDA layer was self-polymerized onto the bare optical fiber to provide the catechol groups for the reduction from Ag + to Ag o through chelating and redox activity. As the reduction of Ag + proceeds, Ag nanoparticles (NPs) were grown in-situ on the PDA layer with uniform distribution. The second PDA layer was applied to prevent Ag NPs from oxidating and achieve an improvement of LSPR signal. The PDA/Ag/PDA-based optical fiber sensor has an enhanced LSPR sensitivity of 961 nm/RIU and excellent oxidation resistance. The stable PDA/Ag/PDA-based LSPR sensor with high optical performance is very promising for future application in optical sensing field.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 20
·6047-6054
·
IF 4.478
Ma Qian,Qiao Juan,Liu Yufei,Qi Li
Recently, polymer-protected gold nanoparticles (AuNPs) have attracted extensive attention due to their good catalytic activities. However, how to regulate their catalytic activities by changing the polymer chain morphologies or the interactions between the ligands and the analytes through external stimuli is still a great challenge. This study describes a simple synthesis of AuNPs capped by thermo-responsive poly( N,N -dimethylacrylamide) (PDMAM). In comparison with three kinds of PDMAMs@AuNPs, PDMAM-2@AuNPs exhibited better peroxidase-mimic ability via the catalytic oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) with hydrogen peroxide (H 2 O 2 ) to generate oxidized TMB (oxTMB). Interestingly, its catalytic activity could be regulated by changing environmental temperature. Importantly, the addition of the antibiotic lomefloxacin endowed the PDMAM-2@AuNPs with enhancement in catalytic efficiency due to electrostatic interactions and the increased levels of reactive oxygen species. Based on this principle, a protocol for highly selective and sensitive monitoring of lomefloxacin has been constructed with the color change from pale blue to deep blue. The ultraviolet–visible absorbance of oxTMB at the wavelength of 650 nm showed a good linear relationship with antibiotic concentration in the range of 0.25–10.0 µM ( R 2 = 0.990). The limit of detection was 0.1 µM. The practical application of the proposed protocol with the promoted peroxidase-mimic activity for the measurement of lomefloxacin in capsules was realized. Graphical abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Wang Enze,Xiong Zixin,Chen Zekun,Xin Zeqin,Ma Huachun,Ren Hongtao,Wang Bolun,Guo Jing,Sun Yufei,Wang Xuewen,Li Chenyu,Li Xiaoyan,Liu Kai
Solitary waves are unique in nonlinear systems, but their formation and propagation in the nonlinear fluid-structure interactions have yet to be further explored. As a typical nonlinear system, the buckling of solid thin films is fundamentally related to the film-substrate interface that is further vulnerable to environments, especially when fluids exist. In this work, we report an anomalous, solitary-wave-like blister (SWLB) mode of MoS 2 thin films in a humid environment. Unlike the most common telephone-cord and web buckling deformation, the SWLB propagates forward like solitary waves that usually appear in fluids and exhibits three-dimensional expansions of the profiles during propagation. In situ mechanical, optical, and topology measurements verify the existence of an interfacial water nanolayer, which facilitates a delamination of films at the front side of the SWLB and a readhesion at the tail side owing to the water nanolayer-induced fluid-structure interaction. Furthermore, the expansion morphologies and process of the SWLB are predicted by our theoretical model based on the energy change of buckle propagation. Our work not only demonstrates the emerging SWLB mode in a solid material but also sheds light on the significance of interfacial water nanolayers to structural deformation and functional applications of thin films.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 8
·2250-2256
·
IF 3.186
Liu Qi,Wang Shihao,Xu Gang,Wu Minghong,Chen Jianjun,Li Junhua
Abstract A novel TiO 2 -supported vanadium-substituted tungstophosphoric acid (PW 11 V/TiO 2 ) catalyst was designed and applied for selective catalytic reduction of NO x by NH 3 . Compared with the commercial tungstophosphoric acid (PW 12 /TiO 2 ), PW 11 V/TiO 2 displayed a nearly 90% activity improvement at 300 °C. In addition, the favorable resistance and stability to SO 2 were also obtained over PW 11 V/TiO 2 catalyst. Phase analysis and spectroscopy results indicated the vanadium was successfully incorporated into the molecular structure of PW 12 , and the Keggin framework still keep stable over the TiO 2 support. H 2 -TPR test proved the incorporation of vanadium promoted the redox ability of PW 11 V. The present study provides us an effective way to improve the performance of catalytic removal of NO x through tungstophosphoric acid catalyst. Graphic Abstract
After introduction of V species, the obtained PW 11 V/TiO 2 catalyst show better NH 3 -SCR performance and N 2 selectivity than PW 12 /TiO 2 catalyst.
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