Science China-Chemistry
·
2021
·Vol. 64
·期 12
·2218-2229
·
IF 9.445
Ye Jiamin,Fu Qinrui,Liu Luntao,Chen Lanlan,Zhang Xuan,Li Qingqing,Li Zhi,Su Lichao,Zhu Rong,Song Jibin,Yang Huanghao
Varieties of contrast agents have been developed for photoacoustic (PA) and ultrasound (US) imaging of cancers in vivo . However, access of traditional contrast agents into the sites of tumors has been principally through passive infiltration without any external force, preventing their deep penetration into the tissues of the tumors, and hindering the use of PA and US for deep tumor imaging. The concept of micro/nanomotors has been the focus of increasing attention as active theranostic agents due to their active movement in particular fluids, thereby conducting assigned tasks. Herein, US-propelled Janus mesoporous SiO 2 partially coated gold nanorods (Au NR-mSiO 2 ) were fabricated for deep tumor NIR-II PA imaging and synergistic sonodynamic-gas therapy. Following US irradiation, 2,2-azobis[2-(2-imidazolin-2-yl) propane] dihydrochloride (AIPH) loaded in mSiO 2 (Au NR-mSiO 2 /AIPH) generated N 2 microbubbles with high efficiency to achieve nanomotor drive. Due to the deep penetration of US, the nanomotors exhibited a capability to travel deep within sites of tumors, providing enhanced PA/US imaging inside the tumors. Furthermore, the nanomotor based cancer therapy was demonstrated through synergistic N 2 gas and sonodynamic therapy. The US-propelled nanomotors demonstrated a novel strategy for the simultaneous PA/US dual imaging deep within tumor tissues and precise therapy of large tumors.
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PROGRESS IN REACTION KINETICS AND MECHANISM
·
2017
·
IF 0.682
Jiao Jing Zhang,Wen Yi Wang,Guo Jian Wang,Cheng Kai,Hua Song,Lu Wang
A model natural gas consisting of hydrogen sulfide, nitrogen and oxygen mixture was used to simulate materials to test the performance of an amine-modified MCM-41 adsorbent prepared by the impregnation method. The adsorbent was characterised by X-ray diffraction analysis, Brunauer–Emmett–Teller analysis, Fourier-transform infrared spectroscopy, transmission electron microscopy and scanning electron microscopy. The results showed that more molecules are able to penetrate the pores following modification, resulting in rapid structural collapse, thus lowering the diffraction intensity. Although the capacity of amine-modified MCM-41 decreased the physical adsorption, chemisorption increased significantly. (3-Aminopropyl)trimethoxysilane/MCM-41 was found to exhibit a good performance for H2S desulfurisation. At 45 °C the breakthrough time was 186 min, the saturated sulfur capacity was 134.38 mg g−1 and the degree of desulfurisation was 54.19%. The adsorption isotherm and kinetics were investigated and the relevant parameters were obtained. The results showed that the adsorption isotherm could be well fitted by the Langmuir model and the maximum adsorption capacities increased with increase of temperature. The adsorption kinetics could be represented by the Bangham model, which suggested that chemical reaction seemed significant in the rate-controlling adsorption step. The adsorption process was spontaneous and exothermic.
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PETROLEUM CHEMISTRY
·
2021
·Vol. 61
·期 11
·1305-1318
·
IF 1.029
Zhu Wenxi,Zheng Xiuhua
Abstract Colloidal Gas Aphron (CGA) drilling fluid is one of the most promising
techniques in underbalanced drilling with excellent plugging and reservoir
protection functions. Due to the limitation of poor thermal stability of
commercial foaming agents used in oilfields, the research on high-temperature
resistant CGA drilling fluid is still a challenge. In this study, a
biodegradable glycine foaming agent AGS-12 was synthesized via a one-step
method. The surface activity, foaming performance (25–150°C) of AGS-12 and the
high temperature performance of AGS-12 based CGA drilling fluid (120–150°C) were
studied. All the results provide a basis for the potential application of AGS-12
as an eco-friendly foaming agent in high-temperature CGA drilling fluids: 1) The
product AGS-12 with 87% conversion rate was synthesized successfully by one-step
method, which can be verified by FT-IR. TGA analysis suggested that AGS-12 had
good thermal stability within 315°C. Moreover, AGS-12 is easily biodegradable
and fully meets the first level discharge standard of petrochemical industry
pollutants. 2) AGS-12 can reduce the surface tension of solvent water from 72.38
to 28.44 mN/m. Analysis of fundamental surface activity parameters illustrates
the higher surface activity of AGS-12, compared with a variety of amino acid
surfactants. 3) Waring-Blender test showed that foams generated by 3% AGS-12
always have higher half-life, foam quality and lower drainage speed than the
foaming agents available on market within 150°C. 4) At 120/140/150°C, aphrons
with diameter of 10–150 µm have been successfully generated in CGA drilling
fluid by using AGS-12 as foaming agent. Rheological and filtration tests
suggested that AGS-12 based CGA drilling fluid is a high-performance drilling
fluid with strong shear thinning behavior, high viscosity, and low filtration
invasion.
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Journal of the American Chemical Society
·
2022
·
IF 16.383
Lingqiang Zhou,Zheyi Liu,Yongjie Guo,Shiwen Liu,Heng Zhao,Shan Zhao,Chunlei Xiao,Shun Feng,Xueming Yang,Fangjun Wang
Maintaining the protein high-order structures and interactions during the transition from aqueous solution to gas phase is essential to the structural analysis of native mass spectrometry (nMS). Herein, we systematically interrogate the effects of charge state and crown ether (CE) complexation on the gas-phase native-like protein structure by integrating nMS with 193 nm ultraviolet photodissociation (UVPD). The alterations of photofragmentation yields of protein residues and the charge site distribution of fragment ions reveal the specific sites and sequence regions where charge and CE take effect. Our results exhibit the CE complexation on protonated residues can largely alleviate the structure disruption induced by the intramolecular solvation of charged side chains. The influences of CE complexation and positive charge on gas-phase protein structure exhibit generally opposite trends because the CE microsolvation avoids the hydrogen-bonding formation between the charged side chains with backbone carbonyls. Thus, CE complexation leads to a more stable and native-like protein structure in the gas phase.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Haoyu Ma,Pengjian Gong,Yunjiao Qiao,Yajiang Huang,Chul B. Park,Hong Jiang,Guangxian Li
Dual fluorescence design based on chemical coating and physical staining was successfully applied in revealing the multi-phase and multi-scale structure simultaneously in nanocomposite foams for the first time (that is nanometer-scale solid phase fillers selectively located chemical coating fluorescence, micrometer-scale solid phase cell walls selectively located physical staining fluorescence and air phase bubbles selectively located no fluorescence). The hybrid fluorescence modification method enables us to selectively locate different fluorescence dyes on nanofiber surface and in polymer matrix. Furthermore, quantitative analysis of the three-dimensional (3D) nanofiber network structure in nanocomposite foams is studied in-depth via numerical reconstruction. The evolution of 3D nanofiller network structure in multi-phase and multi-scale nanocomposite foams is demonstrated via both experimental visualization and numerical calculation. It is found that the average shortest nanofiber distance decreases with increasing cell wall thickness and with decreasing air content. Therefore, the dual fluorescence design exploring 3D functional filler network structure in complicated multi-phase and multi-scale nanocomposite foams greatly helps researchers study the structure-performance relationship of multi-functional materials with nanoscale functional fillers.
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JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·Vol. 75
·期 2
·219-224
·
IF 0.84
Liang Demin,Gao Yihan,Zheng Saijing,Li Gang,Wu Da,Shen Yi
Abstract A simple and rapid gas chromatographic–mass spectrometric (GC–MS) method using selected ion monitoring mode was developed for simultaneous determination of propylene glycol, glycerol and lactic acid in rat plasma and serum. The method employed a single-step derivatization using bis(N,O-trimethylsilyl) trifluoroacetamide with trimethylchlorosilane and required only a small amount of plasma or serum (100 μL). The calibration curves showed linearity with the correlation coefficients of 0.996–0.999. To validate the method, the intra- and inter-day repeatability of the proposed method in rat plasma was evaluated. Recovery was assessed by the standard addition method. To test the applicability of the method, twenty plasma samples in two different time points were analyzed and levels of both propylene glycol and lactic acid in plasma were found to increase after exposure to the propylene glycol aerosol (500 mg/kg). With satisfactory repeatability and recovery the proposed GC–MS method can be successfully applied for analysis of plasma and serum samples.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Fengdong Qu,Bingxue Zhang,Xinxin Zhou,Huifang Jiang,Chuanxi Wang,Xiaohua Feng,Chunjie Jiang,Minghui Yang
The utilization of metal-organic frameworks (MOFs) as precursors or templates to design synthesize nanostructured metal oxides has attracted intense interest for their great potential applications in gas separation/storage, drug delivery, catalysis device, gas sensors, etc. In this paper, porous double-shelled nanocages (NCs), namely ZnO/Ni 0.9 Zn 0.1 O double-shelled nanocages (DSNCs), were synthesized simply through a metal-organic frameworks (MOFs) route. The ZIF-8 rhombododecahedron was first synthesized and then transformed into ZIF-8/Ni-Zn layered double hydroxides (LDH) precursor. Finally, the ZnO-inner/Ni 0.9 Zn 0.1 O-outer DSNCs were obtained through thermal annealing of the as-prepared precursor in air. The ZnO/Ni 0.9 Zn 0.1 O DSNCs, when utilized as gas sensing material, exhibited high sensitivity and selectivity towards xylene. Besides, enhanced gas sensing properties of ZnO/Ni 0.9 Zn 0.1 O DSNCs were observed when compared with ZnO NCs. Such outstanding gas sensing performance of the ZnO/Ni 0.9 Zn 0.1 O DSNCs benefits from their high porosity, large specific surface area, and synergistic effect of ZnO and Ni 0.9 Zn 0.1 O.
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Foods
·
2022
·Vol. 11
·期 24
·4109
·
IF 5.561
Yue Zhang,Suyoung Kang,Han Yan,Dongchao Xie,Qincao Chen,Haipeng Lv,Zhi Lin,Yin Zhu
Wuyi rock tea (WRT) is one of the most famous subcategories of oolong tea, exhibiting distinct aroma characteristics with the application of different cultivars. However, a comprehensive comparison of the characteristic volatiles among WRTs with different cultivars has rarely been carried out. In this study, non-targeted analyses of volatile fragrant compounds (VFCs) and targeted aroma-active compounds in WRTs from four different cultivars were performed using chemometrics and gas chromatography olfactometry/mass spectrometry (GC-O/MS). A total of 166, 169, 166, and 169 VFCs were identified for Dahongpao (DHP), Rougui (RG), Shuixian (SX), and Jinfo (JF), respectively; and 40 components were considered as the key differential VFCs among WRTs by multivariate statistical analysis. Furthermore, 56 aroma-active compounds were recognized with predominant performances in “floral & fruity”, “green & fresh”, “roasted and caramel”, “sweet”, and “herbal” attributes. The comprehensive analysis of the chemometrics and GC-O/MS results indicated that methyl salicylate,p-cymene, 2,5-dimethylpyrazine, and 1-furfurylpyrrole in DHP; phenylethyl alcohol, phenethyl acetate, indole, and (E)-β-famesene in RG; linalool, phenethyl butyrate, hexyl hexanoate, and dihydroactinidiolide in JF; and naphthalene in SX were the characteristic volatiles for each type of WRT. The obtained results provide a fundamental basis for distinguishing tea cultivars, recombination, and simulation of the WRT aroma.Keywords:characteristic volatiles;cultivars;aroma-active compounds;GC-O/MS;multivariate statistical analysis;Wuyi rock teas
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PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Yingying Shi,Meiling Qi
This work presents the investigation of two aliphatic polycarbonate diols (CAPC and HAPC) as the stationary phases for capillary gas chromatography (GC). The CAPC and HAPC capillary columns showed moderate polarity and high column efficiency of 3704 – 4545 plates/m measured by n-octanol and naphthalene at 120 °C. It was found that despite their similar chemical compositions, CAPC and HAPC differ largely in their selectivity towards the isomers of alkanes, methylpyridines and xylenes. As demonstrated, the CAPC column exhibits advantageous comprehensive performance over the HAPC column and the commercial PEG column. Particularly, the CAPC column exhibits higher resolving performance towards the isomers indicated above and the Grob mixture than the HAPC column. Also, it shows distinct advantages over the PEG column in separating the Grob mixture, the isomers of diethylbenzenes and cymenes, and practical analysis of chemical products and the essential oil from the leaves of Rhododendron dauricum L. Additionally, the CAPC column has excellent repeatability and reproducibility on analyte retention times with the relative standard deviation (RSD) values in the range of 0.05% – 0.08% for run-to-run, 0.12% – 0.19% for day-to-day and 2.6% – 4.9% for column-to-column, respectively. Its applications to purity test of chemical products and GC–MS analysis of the essential oil demonstrate its promising future for practical GC analyses.
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PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 15
·7924-7931
·
IF 2.936
Yanling Wang,Yongfei Li,Qian Wang,Qiang Li,Yue Zhang,Lin Yuan
The wettability of a rock’s surface is a vital factor for gas flow and fracturing fluid backflow. As a result of this, novel and effective gas wetting alteration agents are required. In this work, a gas-wetting alteration agent, N,N-bis(perfluorooctyl)imine acetate sodium, was synthesized and characterized by different methods. The wettability of a rock’s surface was evaluated by contact angle and imbibition measurements, the Owens two-liquid method and glass capillary tube rise testing. The results showed that after treatment with 0.5 wt% N,N-bis(perfluorooctyl)imine acetate sodium the contact angles of water and n-hexadecane on the surface of the rock increased from 36° and 0° to 140° and 119°, respectively. The surface free energy rapidly reduced from primeval 72 mN m−1 to 3.4 mN m−1 after treatment with 0.3 wt% N,N-bis(perfluorooctyl)imine acetate sodium. These values agreed with the imbibition measurements and the results of the glass capillary tube rise testing. Moreover, analysis by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of the rock surface significantly increased. The above results fully proved that the wettability of the rock surface is altered from its original water-wetting or oil-wetting to gas-wetting. Furthermore, thermal analysis demonstrated that the gas-wetting alteration agent has good thermal stability, which indicates its great potential to be used as a gas-wetting alteration agent for unconventional gas reservoirs under high temperature conditions.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 30
·305501
·
IF 3.874
Guifang Luo,Lili Xie,Meng He,Rawat Jaisutti,Zhigang Zhu
A flexible fabric gas sensor for the detection of sub-ppm-level NH3 is reported in this paper. The reduced graphene oxide (rGO)-polyaniline (PANI) nanocomposite was successfully coated on cotton thread via an in situ polymerization technique. The morphology, microstructure and composition were analyzed by field-emission scanning electron microscope, x-ray diffraction, Fourier transform infrared spectroscopy and Raman spectroscopy. Furthermore, we have studied the responses of the rGO-PANI nanocomposite-based flexible sensors for the detection of NH3 varying from 1–100 ppm, operated at 22 °C. At the optimized concentration of rGO, the response of these sensors increased by 4–5 times in comparison with the pristine rGO and PANI. These flexible sensors exhibited fast response, remarkable long-term stability, good selectivity and a low detection limit. The sensing mechanism for the high sensing performance has been thoroughly discussed and it is mainly due to the distinctive 1D fiber structure, the formation of a p-p heterojunction between the rGO nanosheets and PANI. The rGO-PANI composite-based fabric sensor with low power consumption is a potential flexible electronic device for the detection of NH3.
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高影响因子
IONICS
·
2022
·Vol. 28
·期 9
·4321-4329
·
IF 2.961
Zhang Jin-Zhong,Wu Shuai,Shen Fengxia,Song Wenkang,Hua Yaxin,Wu Zhenyu,Zhang Xiao-Gang,Shi Jin
A novel gas diffusion electrode (GDE) electrolyzer has been constructed to convert CO 2 into CO, with chlorine (Cl 2 ) and sodium carbonate (Na 2 CO 3 ) produced as the by-products. Using this method, the product value yielded from CO 2 electrolysis can be increased substantially. In contrast to the conventional GDE electrolyzer, we use a cation-exchange membrane as the diaphragm to separate the cathode from the anode compartment, and use NaCl aqueous solution as the anolyte. During the electrolysis process, CO 2 is reduced to CO on the cathode, with CO 3 2− generated accompanied with CO formation. On the anode, Cl − is oxidized to Cl 2 . Na + in the anode chamber transfers through the cation-exchange membrane, and migrates into the catholyte. Thus, Na 2 CO 3 can be obtained owing to the co-existing of Na + and CO 3 2− in the catholyte. Using this method, CO 3 2− penetrating through the anion-membrane can be avoided. This problem has been considered as the crucial obstacle that impedes the practical utilization of the conventional GDE electrolyzer. Our designed GDE electrolyzer has a promising application perspective in the phosgene chemical industry.
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