APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhenwei Zhang,Junkai Zhang,Yixing Zhao,Yanli Wan,Sen Li,Yingwen Tang,Tao Li,Tingfang Tian,Li Wang
All-inorganic halide perovskite quantum dots are widely known to suffer luminescence degradation owing to their intrinsic instability in atmospheric circumstances. Their high surface energy and weak internal ionic bonding could result in quantum dot agglomeration and structural degradation. In this work, we demonstrate that triallylamine is an efficient recovery agent to reignite the luminescence emission of aged CsPbBr 3 quantum dots. The aged CsPbBr 3 quantum dots re-emit bright green light instantly after triallylamine etching. The X-ray photoelectron spectroscopy results indicate a noticeable decrease of surface under-coordinated Pb ions content, leading to surface re-healing and photoluminescence quantum yields increasing. The unique emission recovery could reveal the details of CsPbBr 3 quantum dot surface variety and facilitate the development of perovskite quantum dot display devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2025
·
IF 2.7
Fei Yuan,Yiyuan Xin,Caifeng Yuan,Zhuo Chen,Tongling Qin,Wenxia Hu,Jiahuan Duan,E Tang
A simple, exogenous-base-free, and NBS-mediated C-selenocyanation/cyclization reaction of enaminones with KSeCN under mild conditions, providing a facile route to 2-aminoselenazole products, has been developed. This efficient protocol is postulated to first undergo the NBS-oxidated polarity reversal of the reactive SeCN- anion to form N-selenocyanosuccinimide as an electrophilic selenium source, which can induce the C-selenocyanation of enaminones and enamino esters, followed by a nucleophilic cyclization promoted by in-situ yielded HBr.
研究领域:
有机化学
·
合成化学
·
硒化学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2016
·
IF 3.902
Pan Zhang,Hui Yang,Guojun Wang,Weijun Tong,Changyou Gao
The poly(allylamine hydrochloride)/trisodium citrate aggregates were fabricated and further covalently crosslinked via the coupling reaction of carboxylic sites on trisodium citrate with the amine groups on polyamine , onto which poly- L- lysine and hyaluronic acid were sequentially assembled, forming stable microspheres. The pH sensitive dye and pH insensitive dye were further labeled to enable the microspheres with pH sensing property. Moreover, these microspheres could be specifically targeted to HeLa tumor cells, since hyaluronic acid can specifically recognize and bind to CD44, a receptor overexpressed on many tumor cells. Quantitative pH measurement by confocal laser scanning microscopy demonstrated that the microspheres were internalized into HeLa cells, and accumulated in acidic compartments. By contrast, only a few microspheres were adhered on the NIH 3T3 cells surface. The microspheres with combined pH sensing property and targeting ability can enhance the insight understanding of the targeted drug vehicles trafficking after cellular internalization.
研究领域:
生物材料学
·
肿瘤生物学
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Peng Gao,Huai-Juan Chen,Zi-Jing Bai,Mi-Na Zhao,Desuo Yang,Juan Wang,Ning Wang,Lele Du,Zheng-Hui Guan
An iodoxybenzoic acid-mediated selected oxidative cyclization of N-hydroxyalkyl enamines was developed. Through this strategy, a variety of 2,3-disubstituted pyrroles and pyridines were produced in good selectivity involving oxidation of alcohol, followed by condensation of aldehyde and α-C of enamines. Furthermore, this metal-free method has several advantages, including the use of environmentally friendly reagents, broad substrate scope, mild reaction conditions, and high efficiency.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Song Zhao,Xiaochang Cao,Zijian Ma,Zhi Wang,Zhihua Qiao,Jixiao Wang,Shichang Wang
In this work, imidazolate framework ZIF-8 nanoparticles were synthesized and incorporated into a poly(vinylamine) (PVAm) coating solution. The chemical structure of a PVAm/ZIF-8 film was characterized by X-ray diffraction and attenuated total reflectance Fourier transform infrared spectroscopy techniques. Mixed-matrix membranes (MMMs) were developed by coating the PVAm/ZIF-8 mixed dispersion on a polysulfone (PSf) support membrane. Surface and cross-sectional scanning electron microscopy images of the MMMs were employed to observe the dispersion of nanoparticles in the polymer matrix. The CO2 permeance and CO2/N2 selectivity of the MMMs were evaluated by using a CO2/N2 mixture gas. Optimal preparation parameters for the MMMs were achieved by varying the incorporated ZIF-8 contents in the coating solution and the wet coating thickness. The effect of incorporated ZIF-8 on improving the gas permselectivity was revealed, and the mechanism of CO2-facilitated transport in the PVAm/ZIF-8/PSf membrane was analyzed. The CO2/N2 separation performance of PVAm/ZIF-8/PSf membranes with different wet coating thicknesses was also evaluated at 22–60 °C to analyze the changes of the gas permselectivity with increasing temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Yiran Sun,Qilin Gui,Andong Zhang,Shuxian Shi,Xiaonong Chen
There are huge demands for the development of green, environmentally friendly, and easily prepared cationic adsorbents for treatment of chromium-contaminated water. In this research, we demonstrate the fabrication of a novel polyvinylamine-grafted polypropylene membrane (PPM-PVAm) for Cr(VI) adsorption. Based on a rapid two-step method, polypropylene membrane (PPM) was grafted with high biomedical safety N-vinylformamide (NVF), and then amino groups were generated via hydrolysis of the poly(N-vinylformamide) (PNVF) and these amino groups could be protonated under acidic condition as Cr(VI) adsorbing sites. The effects of both the PNVF grafting rate and its degree of hydrolysis on the adsorption performance of PPM-PVAm were investigated. The membrane with a PNVF grafting rate around 55% (wt) and a degree of hydrolysis around 70–80% exhibits the best performance for Cr(VI) adsorption under the optimal conditions, i.e. pH 2 at about 40 °C. The adsorption of Cr(VI) on PPM-PVAm matches the Langmuir model, showing a maximum Cr(VI) adsorption capacity of 208.3 mg per gram dry membrane. PPM-PVAm could be deprotonated under alkaline condition so the adsorbed Cr(VI) could be easily removed by NaOH/NaCl aqueous solution. The membrane shows excellent recycling performance, and 90.6% of the adsorption capability remains even after 10 cycles of adsorption-desorption test. Combining the unique performance and eco-friendly process in the fabrication of the membrane, PPM-PVAm shows great potential in adsorptive removal of Cr(VI) from water.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yun Wu,Yiping Nie,Zhu Long,Pengxiang Si,Dan Zhang
Strain-stiffening hydrogels are essential in the development of ionic skin, as human skin possesses a strain-stiffening property for self-protection. Semicrystalline polymers such as poly(vinyl alcohol) (PVA) have been widely investigated to fabricate strain-stiffening hydrogels via freeze–thaw cycling or chemical cross-linking but with limited adjustable properties. Compared with PVA, polyvinylamine (PVAm) has a higher reactive activity, making it easier to achieve multifunctionalities including strain-stiffening in a PVAm hydrogel. However, the amine moieties in the backbone tend to be ionized and form strong ionic hydrogen bonds with water, resulting in difficulties in forming crystalline hydrogels by conventional methods. Herein, a one-pot method to induce crystallinity and achieve multifunctional hydrogel is devised via coacervation of PVAm. Different from a published coacervation method to fabricate hydrogels with various properties via noncovalent interactions between different chemicals, coacervation occurs between PVAm to form aggregated and loose PVAm in our devised system. Such a strategy lowers the amine–water binding energy in the polymer-dense phase to achieve crystallinity and subsequently the strain-stiffening property; meanwhile, self-healability, self-adhesion, and ionic conductivity can be realized in the polymer-loose phase. The obtained hydrogel integrates stretchability (∼1300% elongation), toughness (227 kPa), the strain-stiffening property (∼10 times increase), self-adhesion (90 J m–2), self-healability (∼80% healing efficiency in toughness), and ionic conductivity (0.22 mS m–1). This convenient strategy will open a new horizon to design multifunctional skin-mimic materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Lianlong Zhan,Wei Lu,Qin Xiang,Zhiping Chen,Wenlu Luo,Cailin Xu,Renting Huang,Shuagnfei Wang,Hui He
Using biomass for the production of low-energy regenerative carbon capture materials represents an effective strategy to advance carbon dioxide capture and storage technologies. In this study, a low-energy regenerative bagasse-based CO 2 capture material is synthesized through a one-step, rapid crosslinking strategy. In this method, epichlorohydrin is used to crosslink bagasse with temperature sensitive Pluronic® F-127 and polyethyleneimine, thereby addressing the challenge of simultaneously incorporating multiple functional groups into the biomass matrix. The resulting material with abundant amino adsorption sites demonstrates a high adsorption capacity of 4.52 mmol/g. Interestingly, the temperature-sensitive response of the material facilitates the grafted amine chain segments on bagasse to stretch and shrink reversibly within a narrow temperature range of 25 °C for adsorption and 55 °C for desorption. The shrinkage state is conducive to the CO 2 desorption process, resulting in an ultralow regeneration temperature of 55 °C. Additionally, the water contained in the material enhances its cyclic stability in extreme environments, such as pure CO 2 atmosphere at high temperature. Overall, this research not only provides new ideas for enhancing the long-term stability and economic viability of CO 2 capture materials but also offers feasible solutions for combating climate change and promoting sustainable development.
研究领域:
材料科学
·
环境科学
·
生物质工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 32
·16746-16761
·
IF 7.443
Jiayou Liao,Zhi Wang,Chengyun Gao,Ming Wang,Kai Yan,Xianmei Xie,Song Zhao,Jixiao Wang,Shichang Wang
A PVAm–HT membrane is fabricated by establishing a hydrotalcite (HT) channel in a polyvinylamine (PVAm) fixed carrier membrane. The flexible PVAm fixed carrier membrane material as a matrix membrane is beneficial to get high permeance. Simultaneously, the HT channels can be used as high-speed facilitated transport channels, in which the movable carbonate can actively meet CO2 and help to increase the CO2/N2 selectivity of membranes as in liquid membranes or in ion exchange membranes. Moreover, the unobstructed HT channels are conducive to transport CO2 rapidly and they can increase the chain spacing of polymers; these are beneficial to further enhance the permeance of membranes. In addition, the charged layers of HT provide necessary stability for movable carriers due to the electrostatic attraction. Thus, the PVAm–HT membrane obtains high permeance and high selectivity, as well as good stability. The CO2 permeance of the PVAm–HT membrane reaches 3187 GPU and the CO2/N2 selectivity of the PVAm–HT membrane reaches 296 at 0.11 MPa.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Junhui Wu,Zhi Wang,Yao Wang,Wentao Yan,Jixiao Wang,Shichang Wang
It is known that some commercially antifouling reverse osmosis (RO) membranes are coated with polyvinyl alcohol (PVA) layers. In this work, a new antifouling RO membrane was prepared by surface grafting of a commercial RO membrane (RE4021-TE from Woongjin, without a PVA layer) with the positively charged and hydrophilic polyvinylamine (PVAm) which was synthesized in lab. To determine the similarities and differences between the PVAm-grafted and PVA-coated membranes, one lab-prepared PVA-coated membrane (also coating on the TE membrane) and two typical commercially antifouling RO membranes with PVA coating layers (BW30FR from Filmtec and LFC3 from Hydranautics) were used for comparisons. Successful synthesis of PVAm was confirmed by the results of the ATR-FTIR and 1 H-NMR analyses. ATR-FTIR, XPS and zeta potential measurements of the membranes together indicated that the PVAm was successfully grafted onto the TE membrane surface. The membrane surface became more hydrophilic and smoother after the PVAm grafting. More importantly, for the TE membrane, the membrane surface charge climbed from negative to positive values after the grafting of PVAm with increasing concentrations, while the surface was still negatively charged after the PVA coating though the charge density was reduced. Besides, the PVAm grafting had smaller influence on the membrane permselectivity than the PVA coating: after the PVAm grafting (with a concentration of 0.20 w/v%) the salt rejection was slightly increased and the water flux decreased by 12.4%, but after the PVA coating the salt rejection was slightly declined and the water flux decreased by 35.4%. Fouling behaviors of the membrane grafted with 0.20 w/v% PVAm and the other three membranes with PVA coating layers were investigated and compared using two proteins (bovine serum albumin (BSA) and lysozyme), one polysaccharide (sodium alginate, SA), one surfactant (dodecyltrimethylammonium bromide, DTAB) and one colloid (colloidal ferric hydroxide, Fe(OH) 3 ) as model foulants. The results showed that the PVAm-grafted membrane exhibited better antifouling property than the two commercially antifouling RO membranes with PVA coating layers. In addition, fouling behavior of the lab-prepared PVA-coated membrane indicated that lower initial water flux resulted in less initial flux decline in the fouling process. This work provides a new potential strategy for improvement of antifouling property of commercial RO membranes besides the traditional PVA coating process .
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
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Weifan Wang,Ye Yuan,Fei Shi,Qinghua Li,Song Zhao,Jixiao Wang,Menglong Sheng,Zhi Wang
Mixed matrix membrane (MMM) is now emerging as a viable and promising option for industrial separation processes due to its combination of the benefits of polymers and porous nanofillers. However, the aggregation of nanofillers at high concentrations hinders the development of MMM. Here, we introduce a simple polymeric surface post-modification method by covalently bonding polyvinylamine (PVAm) to prepare polymer-modified Schiff base network-1 (SNW-1) called SNW-P. Adjusting the post-modification time improved the dispersibility of SNW-P. Compared to SNW-1, MMMs with SNW-P 4H as nanofiller achieved a significantly high CO 2 permeance of 3092 GPU as well as the CO 2 /N 2 selectivity of 184 at the feed gas pressure of 0.2 MPa, which obviously surpasses the current limit enumerated by 2019. Additionally, for CO 2 /CH 4 and CO 2 /H 2 separation, the optimized membrane also exhibits excellent CO 2 permeance. With low-cost raw materials and superior properties, the membrane created in our research has good potential for large-scale applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Chaoqi Ge,Menglong Sheng,Ye Yuan,Fei Shi,Yi Yang,Song Zhao,Jixiao Wang,Zhi Wang
Mixed matrix composite membranes (MMCMs) are considered as one of the potential directions for the development of CO 2 capture membranes. Nevertheless, the high cost and the challenging nature of improving separation performance are significant obstacles that prevent MMCMs from being widely applied in practice. In this study, we developed a cost-effective modified pore-optimized MOF-808 (MOF-808@PVAm) and utilized it to fabricate high-performance CO 2 capture MMCMs. Specifically, MOF-808 and polyvinylamine (PVAm) were cross-linked by γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560), which improved the pore structure characteristics of MOF-808 and led to high-performance MMCMs. For 2 bar feed gas (CO 2 /N 2 , 15/85), the MMCM with 33.33 wt.% MOF-808@PVAm loading displayed remarkable CO 2 permeance of 2753 GPU and selectivity of 181. The prepared MMCM demonstrated good operational stability in simulated flue gas and exhibited potential for application in various gas purification fields (CO 2 /CH 4 , CO 2 /H 2 ) through gas permeation tests.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）