RSC Advances
·
2016
·Vol. 6
·期 19
·15694-15700
·
IF 3.289
Ge Yang,Jianxi Zhao
The reverse aggregates formed by mixed zwitterionic surfactant, N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulphonate (abbreviated to SB-12), and non-ionic surfactant, tetraoxyethylene lauryl ether (C12E4), in cyclohexane have been studied using rheological and small angle X-ray scattering (SAXS) measurements and polarised-microscopy (POM) observations. With the help of C12E4 and a trace amount of water, SB-12 was dissolved in cyclohexane to obtain a homogeneous solution. The morphologies of the aggregates depended on the molar ratio of C12E4 to SB-12, β. At β = 1, reverse wormlike micelles were formed, and at β = 2, there were reverse vesicles in the solution. The mechanism underpinning the reverse aggregate formation was discussed. The amount of trace water, represented as the mole ratio of water to total surfactants W0, did not influence the aggregate morphologies.
研究领域:
胶体化学
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界面科学
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DOI
高影响因子
iScience
·
2021
·
IF 5.458
Wanying Du,Xionghui Jia,Zhixuan Cheng,Wanjing Xu,Yanping Li,Lun Dai
Two-dimensional (2D) semi-conductive transition metal dichalcogenides (TMDCs) have shown advantages for logic application. Complementary metal-oxide-semiconductor (CMOS) inverter is an important component in integrated circuits in view of low power consumption. So far, the performance of the reported TMDCs-based CMOS inverters is not satisfactory. Besides, most of the inverters were made of mechanically exfoliated materials, which hinders their reproducible production and large-scale integration in practical application. In this study, we demonstrate a practical approach to fabricate CMOS inverter arrays using large-area p -MoTe 2 and n -MoS 2 , which are grown via chemical vapor deposition method. The current characteristics of the channel materials are balanced by atomic layer depositing Al 2 O 3 . Complete logic swing and clear dynamic switching behavior are observed in the inverters. Especially, ultra-low power consumption of ∼0.37 nW is achieved. Our work paves the way for the application of 2D TMDCs materials in large-scale low-power-consumption logic circuits.
研究领域:
电子工程
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材料科学
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DOI
PubMed
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 8
·4588-4598
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IF 7.76
Wenya Xu,Junyan Dou,Jianwen Zhao,Hongwei Tan,Jun Ye,Masayoshi Tange,Wei Gao,Weiwei Xu,Xiang Zhang,Wenrui Guo,Changqi Ma,Toshiya Okazaki,Kai Zhang,Zheng Cui
Two innovative research studies are reported in this paper. One is the sorting of semiconducting carbon nanotubes and ink formulation by a novel semiconductor copolymer and second is the development of CMOS inverters using not the p-type and n-type transistors but a printed p-type transistor and a printed ambipolar transistor. A new semiconducting copolymer (named P-DPPb5T) was designed and synthesized with a special nonlinear structure and more condensed conjugation surfaces, which can separate large diameter semiconducting single-walled carbon nanotubes (sc-SWCNTs) from arc discharge SWCNTs according to their chiralities with high selectivity. With the sorted sc-SWCNTs ink, thin film transistors (TFTs) have been fabricated by aerosol jet printing. The TFTs displayed good uniformity, low operating voltage (±2 V) and subthreshold swing (SS) (122–161 mV dec−1), high effective mobility (up to 17.6–37.7 cm2 V−1 s−1) and high on/off ratio (104–107). With the printed TFTs, a CMOS inverter was constructed, which is based on the p-type TFT and ambipolar TFT instead of the conventional p-type and n-type TFTs. Compared with other recently reported inverters fabricated by printing, the printed CMOS inverters demonstrated a better noise margin (74% 1/2 Vdd) and was hysteresis free. The inverter has a voltage gain of up to 16 at an applied voltage of only 1 V and low static power consumption.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Current Pharmaceutical Analysis
·
2023
·Vol. 19
·期 3
·216-221
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IF 0.6
Zhang Liang,Yang Dehui,Liu Ye
Background: A reversed-phase high-performance liquid chromatographic method for determining thrombin activity is described. The improved method can provide a high resolution between substrate Nα-P-toluenesulfonyl-L-arginine methyl ester (TAME) and the product of enzyme reaction,
Nα-P-toluenesulfonyl-L-Arginine (TA). Methods: When the substrate concentration was 5 mg/mL, the Michaelis equation approached the zero-order reaction, and the thrombin enzyme activity must have a good linear relationship with the consumption of TAME or the yield of TA. Results:
The method is suitable for quantitatively analyzing thrombin activity in formulation or serum. Conclusion: Three batches of thrombin lyophilized preparations were determined for activity.
研究领域:
生物化学
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医学检测
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DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 2
·266
·
IF 3.164
Lin Wu,Tao Pang,Yebin Guan,Yiguo Li
This work presents a simple and facile strategy for the creation of Prussian blue containing polymeric nanocapsules. An crosslinked inverse miniemulsion with a formula of water/ K4Fe(CN)6/1,2-bis-(-2-iodoethyl) ethane(BIEE)/ toluene/ PDMAEMA-b-PS stabilizer mixture was prepared as soft template firstly. A crosslinking nanocapsule structure with K4Fe(CN)6in water core could be achieved by a crosslinking reaction between PDMAEMA-b-PS stabilizers and BIEE. Upon the following addition of FeCl3ether solution into the oil phase of this inverse miniemulsion, a coordination reaction between two iron salts occurred immediately to form a Prussian blue complex. Due to the solubility limitation of FeCl3in the oil phase of the miniemulsion, forcing the coordination reaction of K4Fe(CN)6and FeCl3mainly occurred at the oil-water interface of the nanocapsules, resulting in a soft polymer/Prussian blue(PB) hybrid nanocapsule.Keywords:polymeric hybrid nanocapsule;Prussian blue;inverse miniemulsion;coordination
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Hai-yan Liu,Zhi-yong Li,Dan Liu,Ying-Wen Xue,Zhi-guo Shi
Octadecyl bonded silica (ODS) is the most popular packing for reversed-phase chromatography. However, it generally demonstrates bad resolution for polar analytes because of the residue silanols and its poor stability in aqueous mobile phase. To address the problem, a new reversed-phase packing containing both polar-embedded and polar-endcapped moieties was proposed. It was prepared by a very simple method, in which the epoxide addition reaction of 3-glycidoxypropyltrimethoxysilane with 1-octadecanethiol proceeded simultaneously with the reaction of silane coupling onto silica particles. By controlling the molecular ratio of 3-glycidoxypropyltrimethoxysilane to 1-octadecanethiol higher than 1.0 (1.56 for the present study), both polar-embedded and polar-endcapped moieties were achieved onto the packing. The performance of the packing was evaluated in detail. The results demonstrated that neutral, acidic and basic analytes were well separated on the packing. The column efficiency for phenanthrene was 34,200 theoretical plates per meter. In addition, four nucleotides can be separated in 100% phosphate buffered saline solution with good reproducibility, which indicates the packing has good stability in aqueous mobile phase. Amitriptyline, a typical basic analytes, was eluted out with relatively symmetric peak shape (asymmetry factor of 1.36), which implies that the packing has not suffered from the negative effect of residue silanols significantly. Good stability in buffer solution of pH ranging from 2.0 to 10.0 was also documented for the packing.
研究领域:
分析化学
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色谱学
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DOI
PubMed
高影响因子
Small
·
2024
·
IF 13
Boxiang Gao,Weijun Wang,You Meng,Congcong Du,Yunchen Long,Yuxuan Zhang,He Shao,Zhengxun Lai,Wei Wang,Pengshan Xie,SenPo Yip,Xiaoyan Zhong,Johnny C. Ho
As demand for higher integration density and smaller devices grows, silicon-based complementary metal-oxide-semiconductor (CMOS) devices will soon reach their ultimate limits. 2D transition metal dichalcogenides (TMDs) semiconductors, known for excellent electrical performance and stable atomic structure, are seen as promising materials for future integrated circuits. However, controlled and reliable doping of 2D TMDs, a key step for creating homogeneous CMOS logic components, remains a challenge. In this study, a continuous electrical polarity modulation of monolayer WS 2 from intrinsic n-type to ambipolar, then to p-type, and ultimately to a quasi-metallic state is achieved simply by introducing controllable amounts of vanadium (V) atoms into the WS 2 lattice as p-type dopants during chemical vapor deposition (CVD). The achievement of purely p-type field-effect transistors (FETs) is particularly noteworthy based on the 4.7 at% V-doped monolayer WS 2 , demonstrating a remarkable on/off current ratio of 10 5 . Expanding on this triumph, the first initial prototype of ultrathin homogeneous CMOS inverters based on monolayer WS 2 is being constructed. These outcomes validate the feasibility of constructing homogeneous CMOS devices through the atomic doping process of 2D materials, marking a significant milestone for the future development of integrated circuits.
研究领域:
材料科学
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电子工程
·
半导体物理
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DOI
高影响因子
FOOD CHEMISTRY
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2025
·
IF 9.8
Xue-Chen Pei,Fa-Wen Yin,Meng-Ling Jin,Xin-Miao Wang,Hui-Lin Liu,Liang Song,Bei-Wei Zhu,Da-Yong Zhou
Water-soluble copper (CuSO 4 ), oil-soluble copper and different amount of water were added to demetallized and dehydrated Antarctic krill oil (AKO) for accelerated storage. The results showed that water-soluble copper (100 μmol/kg oil) could not significantly promote the oxidation of dehydrated AKO. While water-soluble copper (100 μmol/kg oil) exhibited stronger prooxidative property than oil-soluble copper (100 μmol/kg oil) in AKOs adding water. Meantime, with prolonged storage time of AKO adding water, the size of reverse micelle increased, the electronegativity and surface tension of the oil-water interface decreased, and adding water-soluble copper ions aggravated the above changes. Therefore, it was speculated that Cu 2+ is adsorbed to the oil-water interface by the action of electric charge to promote the oxidation of phospholipids containing unsaturated fatty acids (UFAs) and free UFAs present at the interface by initiating the free radical chain reaction, thereby accelerating the oxidation of AKO.
研究领域:
食品科学
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生物化学
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DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 4
·877-885
·
IF 2.557
Dan Liu,Ting Qiao,Haiyan Liu,Xiaoling Wang,Zhi-guo Shi
In the present study, a polar-embedded reversed-phase liquid chromatographic stationary phase that contained internal sulfone groups was prepared. The synthesis involved the “thiol-ene” click chemistry between the vinyl functionalized silica and 1-octadecanethiol, followed by the oxidization of sulfide to sulfone groups. The resulting material simultaneously possessed the alkyl chain, i.e. C18, and the internal sulfone groups. Elemental analysis demonstrates that the element contents of the C18/sulfone silica were C 8.94%, H 1.87% and S 0.66%. Chromatographic evaluations indicate that the C18/sulfone stationary phase exhibited a little less retention than the C18/sulfide one. A comparable chromatographic performance of neutral analytes was obtained on these two columns, but much better chromatographic performance in the case of basic and acid analytes was obtained on C18/sulfone stationary phase with additional features such as lower silanol activity, better stability (stable working conditions of pH 1.0–10.0), and better compatibility with 100% aqueous mobile phases. The batch-to-batch reproducibility was acceptable (the RSDs of retention times for the probes were no higher than 1.73%), demonstrating the suitability of the applied synthetic strategy for the new stationary phase. The C18/sulfone is a promising polar-embedded RPLC stationary phase.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2019
·Vol. 16
·期 2
·383-389
·
IF 3.399
Yaping Zhang,Bin Zhen,Yue Hu,Guohong Liang,Yaqing Feng
Reverse micellar systems possess a characteristic nanoscale water-in-oil (w/o) structure and can offer mild conditions as a unique and versatile reaction medium. Reverse microemulsions containing water/TX-100 + hexanol/hexane are studied in this work through experimental techniques and simulation methods. Surfactant dosages and water amount affect the micellar structure profoundly, and the polydispersity of the surfactant molecules affects the micellar structure remarkably. TX-100 with 9–10 EO units can form micelles in a simply piling way, while TX-100 with 5–10 EO units endows the micelles with a hierarchical micellar interface and a more compact structure, leading to monodisperse micelles with a smaller diameter. Water in the polar cores has three states. In the reverse micellar system using TX-100 with 9–10 EO units, hydrolysis of tetraethoxysilane happens rapidly and the formed silica gels are apt to aggregate, resulting in polydisperse silica nanoparticles. For the micellar system using TX-100 with 5–10 EO units, the micellar hierarchical distributed interface facilitates the material exchange of tetraethoxysilane and limits the hydrolysis of tetraethoxysilane inside the micelles, providing monodisperse silica nanoparticles.
研究领域:
胶体化学
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材料科学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2022
·
IF 4.966
Jingyuan Xiao,Hongtao Cao,Hailin Cong,Youqing Shen,Bing Yu
The traditional seed preparation method of polystyrene was improved. Firstly, low molecular weight polystyrene seed microspheres with molecular weight of about 10,000 were successfully prepared by adding copolymer inhibitor and adjusting initiator azodiisobutyronitrile. Then, the polystyrene-divinylbenzene microspheres with large particle size were successfully prepared by the method of seed swelling polymerization, using divinylbenzene as crosslinking agent. Polystyrene-divinylbenzene polymer microspheres were characterized by scanning electron microscopy and gel permeation chromatography . The results showed that the molecular weight of polystyrene seed microspheres decreased with the increase of initiator AIBN dosage. Catechol and potassium iodide could significantly reduce the molecular weight of polystyrene seed microspheres. The size of the expanded microspheres prepared from low molecular weight seeds was controllable (up to 10 μm), with uniform particle size distribution and good monodispersity. Large size polystyrene-divinylbenzene microspheres can be used as stationary phase filler for reversed-phase chromatography, and have a good effect in the purification of industrial phytol . Sulfonated-polystyrene-divinylbenzene can be used as hydrophilic chromatographic filler to separate inosine and uridine . In addition, the baseline separation of cytosine , uracil and thymine was successfully achieved by sulfonated-polystyrene-divinylbenzene column in sodium phosphate buffer/acetonitrile mobile phase .
研究领域:
化学
·
分析化学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Fuxin Zhang,Xingcui Wang,Xinyi Huang,Jinlong Zhang,Duolong Di,Dong Pei,Jun Hai
The fact that both phases are liquids makes it simple to implement counter-current chromatography (CCC), which involves alternating elution modes and phase roles during the separation process. Using two distinct multiple dual-mode (MDM) elution techniques for chiral separation, the team demonstrated a superior separation effect in a prior study. When selecting a chiral selector with high enantiomer recognition capability is difficult, the separation efficiency of the CCC column can be enhanced through multiple cycles. This approach facilitates the preparation of enantiomers that are challenging to isolate under classical CCC conditions. A straightforward mathematical model was created in this study to forecast the number of cycles and the mode conversion time needed for the separation process after the modified MDM method was further examined theoretically. After modeling molecules, the theoretical model was confirmed, and the outcomes generally agreed with the calculations from the theoretical model. This offers substantial support for the modified MDM method's real-world implementation in chiral separation.
研究领域:
化学
·
分析化学
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DOI
PubMed
高影响因子
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