Molecular Catalysis
·
2024
·
IF 3.9
Tao Liu,Youcai Zhu,Yue Mu,Xindi Feng,Zhen Liu
CO 2 -based polyols have a unique terminal hydroxyl group structure that makes them suitable for the production of high-performance polyurethane foams. Zn-Co double metal cyanides (DMC) are an important class of catalysts for the copolymerization reaction of CO 2 with propylene oxide (PO). In the DMC-catalyzed CO 2 /PO copolymerization to produce CO 2 -based polyols, the crucial role of chain transfer agents (CTAs) is emphasized. In this work, a high-performance composite CTA (c-CTA) was successfully developed by investigating various dicarboxylic acids and polypropylene glycol (PPG-400) as CTAs. This system combines the high reaction rate of the DMC/PPG-400 system with the high CO 2 insertion rate of the DMC/sebacic acid (SA) system, achieving 2-3 times higher activity than that of single CTA (PPG-400 or SA), reaching 0.5 kg/g. The molecular characteristics of the CO 2 -based polyols synthesized by different DMC/CTAs systems were analyzed by FTIR and 1 H NMR. The reasons for the high catalytic activity of the DMC/c-CTA system were elucidated by analyzing the hydrogen bond distribution in each DMC/CTA systems. Overall, this work provides a theoretical guidance for the development of novel CO 2 -based materials with high industrial application value.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JACS Au
·
2025
·
IF 8.7
Hui-Peng Lv,Yong Ai,Wei Hu,Yuqin Susan Xiong,Yan-Ran Weng,Xian-Jiang Song,Yan Qin,Wei-Qiang Liao,Ren-Gen Xiong
Molecule intercalation has shown distinct advantages in modulating the superconducting properties of 2D materials. Chiral molecule intercalation provides a strategy for tuning electronic properties, while this approach has been limited to a few 2D materials such as TaS2 and TiS2. Although extensive research on 2D SnSe2 exists, chiral molecule intercalation in SnSe2 remains unexplored. Herein, we report the first successful electrochemical intercalation of chiral CTA cations (CTA = 3-chloro-2-hydroxypropyltrimethylammonium) into SnSe2 by using piezoelectric R/S-CTA-Cl with a large piezoelectric coefficient of approximately 24 pm/V as the precursors, leading to the formation of superconductors R/S-CTA–SnSe2. Characterization techniques, including powder X-ray diffraction, Raman spectroscopy, and circular dichroism spectroscopy, confirm a significant lattice expansion in SnSe2 and the successful intercalation of chiral CTA cations, while polar R/S-CTA-Cl does not endow R/S-CTA–SnSe2 with piezoelectric/ferroelectric properties. Magnetic susceptibility and electrical transport measurements reveal that the intercalated R/S-CTA–SnSe2 materials exhibit a superconducting transition at around 5 K. Notably, the distinct out-of-plane and in-plane upper critical magnetic fields demonstrate the 2D nature of the intercalated compounds. This work highlights an approach for designing and tailoring superconducting materials through chiral cation intercalation and opens avenues for further exploration of chiral effects in superconductors.
研究领域:
材料科学
·
凝聚态物理
·
纳米技术
·
电化学
·
固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Panpan Guan,Duo Wang
Cellulose triacetate (CTA) forward osmosis (FO) membrane was fabricated with a polyvinyl alcohol (PVA)-modified nonwoven fabric (NWF) as a support material, which helps achieve a significant improvement in membrane performance. First, a surface modification was performed on the NWF by attaching PVA and glutaraldehyde to the fabric by cross-linking. Second, a CTA membrane was cast on the surface of the surface-modified NWF by phase inversion process. Then, the modified NWF and the modified CTA membrane were characterized by infrared spectroscopy, scanning electron microscopy (SEM), and the contact angle. It was found from the infrared spectroscopy that large quantities of hydroxyl group on the surface made the NWF more hydrophilic. It was also found from the SEM that, the PVA was not only attached on the surface of the fabric, but also embedded in the fabric. With the PVA content of the modified CTA membrane increased, the small sponge-like pores in the support layer were changed gradually into bigger finger-like pores. After the PVA modification, the contact angle of the NWF decreased from 116.9° to 38.5°, and that of the modified CTA membrane decreased from 114.1° to 55.8°, leading to a significant improvement in hydrophilicity. As a result, the water flux of the PVA-modified CTA FO membrane in FO mode was greatly improved up to 55 LMH. And the same time the Js/Jw was only 0.25. It has been calculated that the modified CTA membrane has a porosity of 0.51, and a tortuosity of 0.48, and a structural parameter of 93.65 μm. Compared the PVA-modified CTA membrane with several other FO membranes, it was found that the former has a smaller structural parameter and which can effectively reduce the internal concentration polarization in the support layer, thereby resulting in a significant improvement in membrane performance.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Ganhua Qiu,Ting Wang,Xiaoli Li,Xueqin Tao,Benxia Li
A heterostructure photocatalyst consisting of BiOCl nanoplates and a bismuth-organic hybrid layer (alias BiCl3Br–CTA) was synthesized through a one-step solvothermal process. The BiOCl/BiCl3Br–CTA heterostructures exhibited broad light absorption and enhanced electron–hole separation efficiency. Moreover, the abundant oxygen vacancies (OVs) and superoleophilic surface endowed the photocatalyst with high abilities for adsorption and activation of O2 and toluene. Therefore, the BiOCl/BiCl3Br–CTA photocatalyst showed excellent activities for the C(sp3)–H bond oxidation of toluene under full-spectrum irradiation and visible light of simulated sunlight, which are 6.8-fold and 237.8-fold, respectively, than those of BiOCl nanoplates. The photocatalytic mechanism was revealed by a series of controlled experiments and in situ ESR detections. The selective oxidation of toluene was promoted by the synergy between the electrons in BiOCl for activating O2 and the holes in the BiCl3Br–CTA layer for activating the C(sp3)–H bonds. This research demonstrates an effective strategy to construct high-activity photocatalysts for challenging organic transformations.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 19
·1518
·
IF 3.2
Zhu Tao,Wang Juanjuan,Ma Pengkang,Chen Mingyang,Zhao Zhongliang,Peng Zhanhui,Chao Xiaolian
The combination of high power density, fast charging–discharging speeds, and environmental friendliness positions lead-free ceramic-based dielectric capacitors as a leading candidate material for next-generation pulsed power devices. However, to achieve a high recoverable energy density, a relatively large external electric field needs to be applied, which compromises the electrical insulation integrity and stymies the future development of ceramic capacitors. Under the guidance of various cooperative strategies, this study successfully prepared (1 − x )[0.94(Bi 0.5 Na 0.5 )TiO 3 – 0.06BaTiO 3 ]– x Ca 0.5 TaO 3 ceramics, discussing the influence of the linear dielectric Ca 0.5 TiO 3 in BNBT ceramics. The paper has found that increasing the content of CTa can enhance the density of BNBT ceramics and reduce the grain size. When x = 0.12, a grain size of 0.70 μm is obtained, and the breakdown electric field increases from 250 kV/cm at x = 0.01 to 454 kV/cm at x = 0.12. Meanwhile, a likewise considerable recoverable energy storage density is achieved, exceeding 7.19 J/cm 3 under moderate electric fields and achieving an outstanding energy storage efficiency ( η ) of 78%, which can be suitable for advanced energy storage capacitors that operate under medium electric fields.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Xiu Ju Wang,Xin Lian Shi,Shu Fang Hou,Jian Hua Yang,Kai Li Zhou,Zhong Peng Wang,Li Guo Wang
In this paper, a novel nanocomposite forward osmosis membrane (nTiO2-CTA/CA) was fabricated by introducing nanotitaniumdi oxide (nTiO2) into the cellulose triacetate/cellulose acetate (CTA/CA)-based casting solution using phase inversion methods. Casting composite and preparation--nTiO2 content, blend temperature and coagulating bath temperature--were tested for their effects on pure water flux and salt rejection of membranes. Results revealed that the FO membrane prepared under optimized composition showed excellent desalination performance (high water flux = 5.38 L/m2·h and salt rejection > 97 %). Moreover, SEM images showed that addition of nTiO2 resulted in nanocomposite forward osmosis membrane with a smoother surface. The contact angle of the membranes decreased from 76o to 51° with increase nTiO2 concentration from 0% to 0.10%.
研究领域:
膜科学
·
水处理技术
·
材料科学
·
纳米技术
·
环境工程
✓ 已验证
DOI
LANGMUIR
·
2012
·
IF 4.186
Tianyou Chen,Binyang Du,Zhiqiang Fan
Organic–inorganic hybrid mesoporous polymers were successfully synthesized by using a template-directed free radical polymerization technique in aqueous solution at 0–5 °C with oxidative complexes as self-decomposed soft templates. The oxidative complexes ((CTA)2S2O8), which were formed between anionic oxidant (S2O82–) and cationic surfactant (cetyltrimethylammonium bromide, CTAB) at 0–5 °C, can be automatically decomposed due to the reduction of S2O82–. No additional treatment was needed to remove the templates. The reactive functional monomer, 3-(trimethoxysilyl)propyl methacrylate (TMSPMA), was used as main monomer. Styrene was used as the comonomer. With simultaneous free radical copolymerization of TMSPMA and styrene, condensation of methoxysilyl groups, and the self-decomposition of (CTA)2S2O8, organic–inorganic hybrid mesoporous polymers were successfully obtained. The mesoporous structures and morphologies of the resultant hybrid mesoporous polymers were found to be strongly dependent on the feed amounts of TMSPMA and styrene. In the absence of styrene, the hybrid polymer PTMSPMA exhibited mesh-like bicontinuous structures with mesopores and high surface area (335 m2/g). With the incorporation of styrene, mesoporous nanoparticles were obtained. The surface areas of the mesoporous nanoparticles decreased with the increase of styrene contents. The adsorption capabilities of such mesoporous polymers for organic dye (Congo red) and protein (bovine serum albumin) were also studied.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 14
·4653-4661
·
IF 6.177
Gao Xiao,Huiying Lin,Yiting Lin,Liyin Chen,Xiancai Jiang,Xia Cao,Samson Afewerki,Yujuan Zhang,Weixia Zhang
Oxygen reduction reaction (ORR) electrocatalysts that are stable, highly efficient, and cost-effective play a significant role in the development of energy storage and conversion technologies. Transition metal carbonitrides have been investigated as an alternative to precious metal-based catalysts. Developing noble metal-free two-dimensional (2D) carbon-based materials for efficient ORR electrocatalysts can reduce the consumption of noble metals; more importantly, these materials have the advantages of being highly abundant, having a large active surface area, being easy to functionalize, and being chemical stable. Herein, we exquisitely designed the in situ growth of Co nanoparticles coated with tannin-carbon (CTA) embedded on hierarchical porous two-dimensional ultrathin g-C3N4 nanosheets (Co–CTA@g-C3N4), through the thermal transition of cobalt–polyphenol-networks modified graphitic carbon nitride (Co–TA@g-C3N4) by virtue of the excellent interfacial adhesion ability of an ortho-phenolic hydroxyl group in tannic acid (TA) to metal ions. By carefully tuning the Co/TA molar ratio in the Co–TA@g-C3N4 precursor and the carbonization temperature, an active stable ORR catalyst of the hybrid 2D Co–CTA@g-C3N4 heterostructured nanosheet is obtained. The results reveal that Co2.5–CTA1@g-C3N4-700 °C exhibits outstanding ORR activities, including outperforming the commercial 20 wt% Pt/C with a more positive half-wave potential of −0.864 V versus Ag/AgCl and high selectivity to the four-electron pathway (n ≈ 3.7), as well as outstanding stability and methanol tolerance.
研究领域:
电化学
·
纳米材料科学
·
能源催化
·
表面工程
·
功能材料设计
✓ 已验证
DOI
高影响因子
Processes
·
2018
·Vol. 6
·期 5
·54
·
IF 1.279
Lei Chen,Cuiyun Liu,Yongjun Sun,Wenquan Sun,Yanhua Xu,Huaili Zheng
The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. Themicrocystis aeruginosathat was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s−1, respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).Keywords:chitosan-based flocculant;alga removal;graft copolymerization;photopolymerization;flocculation properties
研究领域:
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Xiaogeng Lin,Yasan He,Yuting Zhang,Wanyin Yu,Tao Lian
The comparably low performance hinders the application of CTA based forward osmosis (FO) membranes. Herein, sulfonated-COFs incorporated CTA/CA membranes were designed to enhance the FO performance, taking advantages of the sulfonated COFs with high hydrophilicity, size exclusion and electrostatic repulsion to salt. Two COFs with different pore size were synthesized and sulfonated to prepare hydrophilic COF-SO 3 H. The COF-SO 3 H with different loading was then added into CTA/CA casting solution to fabricate incorporated membranes. Characterizations and FO tests revealed that an appropriate amount of COF-SO 3 H in the membrane matrix could increase membrane porosity, reduce structural parameter (S), bring more negative charges and improve hydrophilicity, leading to enhanced permeability, higher selectivity and suppressed internal concentration polarization. One of the synthesized COF-SO 3 H, named TATP-SO 3 H, had a pore size of 0.84 nm, ideal for both easy passthrough of water and high rejection to salt. The XPS results verified the existence of H-bonding between TATP-SO 3 H and CTA/CA. The membrane with 0.2 wt% TATP-SO 3 H loading had the best porosity and S, and achieved high flux (13.34 LMH) and selectivity ( J w /J s 6.26 L/g) in FO mode, both of which were 2–3 times of those of the neat CTA/CA membrane and the unfunctionalized-COFs incorporated membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 3.7
Yan Gao,Shumin Zhao,Jingwen Huang,Tao Han,Jianshe Zhao
Venturello-structured polyoxometalates (POMs) are effective homogeneous catalysts and confining POMs to size-matched metal-organic frameworks (MOFs) as heterogeneous catalyst is an effective way to improve their practical application. The appropriate pore and narrow window of pristine UiO-67 can not only enclose POMs in single molecule but also limit their leaching and can provide a suitable platform for the oxidation of most sulfur-containing organic compound. The composite (CTA) 3 PW 4 @UiO-67 was prepared by a facile in situ synthesis method, characterized by a variety of means and tested for desulfurization of multicomponent simulated diesel. The results prove that the active component (CTA) 3 PW 4 is effectively encapsulated, and the composite (CTA) 3 PW 4 @UiO-67 show remarkable desulfurization activity and excellent reusability. In addition, the kinetics and possible mechanism of the reaction were investigated. This work opens up a new idea for the design of “host-guest adapted” catalyst suitable for fuel desulfurization technology.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2016
·
IF 2.76
Ye Zhu,Qiong Hu,Wei Wei,Chenglin Yi,Xiaoya Liu
In this study a type of colloidal particles with a cross-linked poly(divinylbenzene) (poly(DVB)) core and a poly(acrylic acid- r -styrene) (PAS) shell were directly prepared by reversible addition-fragmentation chain transfer (RAFT)-mediated cross-linking copolymerization. The particle size, morphology, zeta potential and pH responsibility were studied. The emulsification study showed that PAS-Poly(DVB) colloidal particles were effective particulate emulsifiers when homogenized with various oils including toluene, white oil, isooctyl palmitate, dicaprylyl carbonate, silicone oil, and propylheptyl caprylate. Additionally, the emulsification performance of PAS-Poly(DVB) colloidal particles at different pH values were investigated. Gelled white oil- in -water high internal phase emulsions (HIPEs) were formed at a high oil volume fraction of 80% when the colloidal particles were flocculated at low pH value. The addition of base can trigger the demulsification of the HIPEs, exhibiting a pH-responsive behavior. The effects of oil phase volume fraction on emulsion rheological properties were investigated. Both the emulsion viscosity and storage modulus (G′) progressively increased with the increasing of oil phase volume fraction. These results suggest that our work provides a convenient and feasible way to prepare effective particulate emulsifiers via the direct chemical reaction, and the PAS-Poly(DVB) colloidal particles have promising potential application in the oil industry and preparation and exploitation of smart materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）