COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Yaohui Xu,Yang Zhou,Ruixing Li
An available route was provided for simultaneous detection and effective adsorption toward Cd 2+ , Zn 2+ and Cu 2+ . The magnetic Fe 3 O 4 @SiO 2 nanoparticles were prepared and functionalized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QTPA) by first using the “grafting from” method, which made the whole process of surface modification on Fe 3 O 4 @SiO 2 nanoparticles simpler and more effective. The as-synthesized QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles exhibited different fluorescence responses for Cd 2+ (doderblue), Zn 2+ (deepskyblue) and Cu 2+ (tomato red) illuminated under a 365 nm UV light, while other ions, such as Ag + , Hg 2+ , Ni 2+ , Co 2+ , Mn 2+ , Pb 2+ , Cr 3+ and Fe 3+ , gave no visible changes under identical experimental conditions. The eye-perceived fluorescent changes only toward Cd 2+ , Zn 2+ and Cu 2+ could serve as the available proofs for the qualitative analysis of the three cations. The UV–vis spectra results showed that the multifunctional nanoparticles exhibited fluorescence enhancements for Cd 2+ and Zn 2+ , and fluorescence quenching for Cu 2+ . The adsorption experiments showed that the nanomaterial was a good candidate for selective removal and enrichment of Cd 2+ , Zn 2+ and Cu 2+ , and had the high adsorption efficiency toward Cd 2+ (95.29%), Zn 2+ (92.37%), and Cu 2+ (91.06%). Moreover, the functionalized composites had strong magnetic sensitivity, which could make them susceptible in an external magnetic field, and easy to separate from the solid and liquid phase. More specific to this work, simultaneous fluorescence determination of Cd 2+ , Cu 2+ , and Zn 2+ by naked eye was proposed based on QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Ming Li,Guangsen Xiong,Yuling Zhang,Xiaoniu Yu,Qianyong Cao,Huining Xiao
Rhodamine chromophore was introduced into a chitosan based adsorbent developing for Hg (II) detection and removal in aqueous solution. The adsorbent displayed highly sensitive and selective fluorimetric and colorimetric response to Hg (II) with barely interference with more than ten kinds of competitive metal ions. The adsorbent exhibited strong orange fluorescence emission while encountering Hg (II) with the colour turning to red immediately and could be easily detected by naked eyes. In addition, the detection limit of the adsorbent was calculated to be 8.24 × 10 −7 M, and the adsorption capacity was as high as 139.08 mg/g according to the batch adsorption experiments. Furthermore, the interaction between adsorbent and Hg (II) was verified to fit well with Langmuir isotherm model and the pseudo-second-order kinetic model. Thermodynamic studies demonstrated that lower temperature was benefit for the adsorption.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2024
·
IF 0
Ying Li,Chen Xu,Zi-Long Wang,Jia-Zhen Lu,Yi-Chen Shang,Mi-Tang Wang
With the increasing development of advanced optical anti-counterfeiting technologies, it is essential to develop a simple, fast fluorescent material with anti-counterfeiting properties. In this study, we successfully prepared a single-emission CDs-based hydrogel (CDs@PVA-Alg) by introducing carbon dots (CDs) into the interpenetrating network of sodium alginate (Alg) and poly(vinyl alcohol) (PVA) via hydrogen bonding and further cross-linking them with Ln3+ ions to obtain dual-emission Ln-functionalized CDs-based hydrogels (Ln@CDs@PVA-Alg) (Ln = Tb, Eu). By freeze–thawing and ion-exchange methods, the resulting hydrogels displayed extraordinary mechanical properties and significant photoluminescent properties. On one hand, the CDs@PVA-Alg hydrogel demonstrated distinct fluorescence responses to Ln3+ ions. On the other hand, the fluorescence of Tb@CDs@PVA-Alg was quenched by H+ ions and restored in OH– solution. Furthermore, the mechanism of the above fluorescence response was explored in depth, which was further used to create an excellent optical anti-counterfeiting platform that can be utilized for multilevel anti-counterfeiting and repeatable information loading. By changing the excited light and chemical reagent, these materials enable versatile operations such as encryption, decryption, decoding, loading, and unloading of a wide range of information. This study not only supplies a representative example of the fabrication of dual-emitting Ln@CDs@PVA-Alg hydrogels but also investigates their potential application as smart polymeric gels with multifunctionality.
研究领域:
材料科学
·
光学
·
化学工程
✓ 已验证
DOI
Polymer Chemistry
·
2014
·Vol. 6
·期 7
·1127-1136
·
IF 5.368
Shangfeng Wang,Bin Wu,Feng Liu,Yun Gao,Weian Zhang
We herein report a new strategy to fabricate novel well-defined alternating copolymers of poly(VBCDEG-alt-SaAEMI)s which were synthesized via alternating RAFT copolymerization of para-methoxydiethylene glycol-substituted styrenes (VBCDEG) and N-(2-salicylaldehyde-aminoethyl)maleimides (SaAEMI). 1H NMR, 13C NMR, FTIR and GPC results indicate that poly(VBCDEG-alt-SaAEMI) copolymers have well-defined alternating structures and narrow polydispersity (Mw/Mn < 1.35). It is interesting that poly(VBCDEG-alt-SaAEMI) alternating copolymers exhibit an excellent selective fluorescence “OFF–ON” response to Zn2+ by inhibiting the photoinduced electron transfer (PET) effect through copolymerization, while the monomer SaAEMI almost has no fluorescence response to Zn2+ due to the PET process. The sensors based on poly(VBCDEG-alt-SaAEMI) alternating copolymers have very fast response (30 s) to Zn2+, 62-fold fluorescence enhancement in aqueous solution and a detection limit of about 0.25 μM. Additionally, the poly(VBCDEG-alt-SaAEMI) alternating copolymers also show a remarkable green fluorescence “OFF–ON” switch (230∼fold) when the pH turns from 11 to 12, thus these copolymers have potential application in dual-color detection.
研究领域:
材料化学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
He Li,Hong-Gang Ye,Rui Cheng,Jiazhuang Guo,Zhi-Bin Liang,Ge Li,Qing Li,Cai-Feng Wang,Su Chen
Carbon dots have been rapidly developed as a kind of luminescent nanomaterials . However, methods for the synthesis of long-wavelength-emissive carbon dots are still not mature enough. Meanwhile, developing a fast and highly sensitive method to detect residual veterinary drugs in food is particularly significant for food safety. Herein, we report the facile fabrication of red-emissive carbon dots (R-CDs) for ratiometric sensing of veterinary drugs. With use of sorbitol and o -phenylenediamine as precursors, R-CDs was prepared via a one-pot solvothermal approach. The resulting R-CDs show mainly excitation-independent and dual-emissive photoluminescence (PL) located at 597 and 645 nm. Meanwhile, the PL quantum yield (QY) of R-CDs without further surface treatment is 33% under 540 nm excitation. Interestingly, the R-CDs exhibit fast fluorescence response to malachite green oxalate (MG oxalate), 1-aminohydantoin hydrochloride (AHD) and pefloxacin , which are abused widely and retained easily in animals. Ratiometric sensing of these veterinary drugs were successfully performed taking the advantage of dual-emissive PL property; the detection limits of MG oxalate, AHD and pefloxacin were 0.79, 0.25 and 0.85 μM, respectively.
研究领域:
食品安全
·
纳米材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 33
·期 2
·245-255
·
IF 1.42
Zhang Di,Yin Jun,He Fei,Ge Ni-lin,Wu Zong-quan,Ding Yun-sheng
We report on the preparation of a well-defined star-shaped tricationic ionic liquid possessing three arms of poly(ethylene glycol) functionalized imidazolium rings. Remarkable solubility was found in most of the organic solvents we used. Thermogravimetric analysis (TGA) exhibited excellent thermal stability and two distinct decomposition temperatures were attributed to two kinds of chemical degradation. Differential scanning calorimetry (DSC) was further employed to investigate the thermal phase transitions, that three different signals ( T
g , T
c , and T
m ) were shown upon the second heating process. Moreover, CH 2 Cl 2 solution of the ionic liquid expressed an excitation-wavelength dependent fluorescence response, leading to the facile modulation of photoluminescence behavior. This work represents an example of utilizing molecular design to construct novel ionic liquids and endow further potential to be used in the engineering materials.
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
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Hongyu Wang,Na Qiu,Xiangfei Kong,Zhenguang Hu,Fuxin Zhong,Haijun Tan
A new Porous Organic Polymer (POP), termed CTF-PTZ , was synthesized through polymerization of 10-methyl-10H-phenothiazine-3,7-dicarbonitrile in the presence of trifluoromethanesulfonic acid catalyst. Owing to the richness of heteroatoms such as N and S atoms in its molecular structure, the fluorescence response of CTF-PTZ to metal ions was studied, and it was found that CTF-PTZ had a specific fluorescence response to Hg 2+ . Thus, high selectivity in fluorescence responsiveness to Hg 2+ of CTF-PTZ was revealed and the detection limit of it was up to be 2.09 × 10 −7 moL·L −1 , which was found by fluorescence spectroscopy titration and fluorescence competition experiments. We successfully demonstrated that the fluorescence responsive POP material provides the promising potential for Hg 2+ detection.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2024
·Vol. 30
·期 3
·284-296
·
IF 6.7
Xuan Jie,Guan Guijian,Han Ming-Yong
Because of the low reactivity of cyclic nitrides, liquid-phase synthesis of carbon nitride introduces challenges despite its favorable potential for energy-efficient preparation and superior applications. In this study, we demonstrate a strong interaction between citric acid and melamine through experimental observation and theoretical simulation, which effectively activates melamine-condensation activity and produces carbon-rich carbon nitride nanosheets (CCN NSs) during hydrothermal reaction. Under a large specific surface area and increased light absorption, these CCN NSs demonstrate significantly enhanced photocatalytic activity in CO 2 reduction, increasing the CO production rate by approximately tenfold compared with hexagonal melamine (h-Me). Moreover, the product selectivity of CCN NSs reaches up to 93.5% to generate CO from CO 2 . Furthermore, the annealed CCN NSs exhibit a CO conversion rate of up to 95.30 μmol/(g h), which indicates an 18-fold increase compared with traditional carbon nitride. During the CCN NS synthesis, nitrogen-doped carbon quantum dots (NDC QDs) are simultaneously produced and remain suspended in the supernatant after centrifugation. These QDs disperse well in water and exhibit excellent luminescent properties (QY = 67.2%), allowing their application in the design of selective and sensitive sensors to detect pollutants such as pesticide 2,4-dichlorophenol with a detection limit of as low as 0.04 µmol/L. Notably, the simultaneous synthesis of CCN NSs and NDC QDs provides a cost-effective and highly efficient process, yielding products with superior capabilities for catalytic conversion of CO 2 and pollutant detection, respectively.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Wen Huang,Lifeng Cai,Xiaoli Zheng,Junkui Zeng,Luna Quan,Dingcai Wu,Zhaopeng Cai,Bingna Zheng
It is challenging but of practical meaning to provide adsorbents with multiple responsive properties. Here, we report an intelligent microporous polymeric adsorbent constructed by block copolymer-grafted microporous polymer nanospheres. With its multi-stimuli-responsive functions, the adsorbent shows rapid fluorescent response to temperature, pH, and organic reagents. Moreover, it also demonstrates super-fast adsorption of pollutants in water, enabling efficient treatment of wastewater. Graphical
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Bailang Zhang,Ting Wang,Mingjie Li,Minghao Mu,Zheng Wang,Yuwei Chen,Chaoxu Li
Biological nanofibrils not only are characteristic of many species of biomasses but also serve as a promising type of sustainable nanomaterials for various applications. However, their production has long relied on an invasive and energy-consuming mechanical shear. A noninvasive and versatile approach remains challenging to exfoliate different types of biomasses into nanofibrils. In this study, we showed a versatile and nonaggressive intercalative deprotonation agent of organic base, which could efficiently deprotonate various biomasses for energy-saving exfoliation and functionalization, including cellulose, chitin, and silk. Both carboxylic nanofibrils and nanofibrils with pristine chemical structures could be produced in high yields through manual shaking or sonication. By further grafting photoresponsive groups via transesterification, intelligent NFs were generated featuring ultraviolet-responsive fluorescence and hydrophilicity. These responsive fluorescence and actuation behaviors promised their potential as green encryption and anticounterfeiting nanomaterials.
研究领域:
材料科学
·
生物化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Hanlin Lv,Wan Zheng,Yuhang Wang,Zhengsheng Hu,Yanjun Chen,Yifeng Wang
Photonic crystal hydrogels are widely used in the field of visual detection, based on the response of the structural color to external stimulus, such as pH, temperature, near-infrared light, and so on. Here, we develop an opal photonic crystal hydrogel by combining polystyrene (PS) photonic crystals with a fluorescent double-network hydrogel and focus on both its visual detection function and mechanical property. The opal hydrogel is composed of nanocomposite hydrogel as the first network and ionic crosslinked hydrogel as the second network. The introduction of PS photonic crystals and terbium ions endows the opal hydrogel distinctive structural colors and fluorescence, respectively. Because of volume changes, the structural color of the opal hydrogel selectively responses to metal ions and organic solvents. Attributing to the ion exchange interaction, the opal hydrogel exhibits fluorescent responses to various metal ions. Combining the responsiveness of structural color and fluorescence, a visual dual-detection mode is set up, with better detection sensitivity and selectivity. Moreover, the characteristics of nanocomposite and double-network crosslinking ensure the opal hydrogel enough mechanical properties to undergo cycle visual detection. Consequently, the fabricated opal hydrogel is promising for use in visual detection to multiple substances in single- or dual-detection mode.
研究领域:
材料科学
·
化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 18
·2100211
·
IF 18.808
Weijing Yao,Qingyong Tian,Jiaqi Shi,Chengsheng Luo,Wei Wu
Expanding the practical application range of self-healing materials has become an important challenge for developing smart materials. Herein, the synthesis of printable, triple-mode fluorescence responsive, and colorless self-healing elastomers, formed by the combination of disulfide cross-linked polyurethane (PU) polymers, carbon dots (CDs) down-conversion fluorescence materials, and lanthanide ions doped upconversion fluorescence materials. The PU elastomers with optimal mechanical properties and good restorability (recover large strain of 500% after relaxation at room temperature (R.T.) for 2 h) are selected to incorporate CDs for fabricating fluorescence responsive elastomers (denoted as PU-CDs). Significantly, the prepared PU-CDs exhibit not only superior tensile strength and toughness (20.95 MPa and 85.13MJ m –3 , respectively) than the previously reported R.T. self-healing elastomers but also show good self-healing properties and achieve blue fluorescence emissions under the ultraviolet excitation. Furthermore, a series of dual-mode fluorescence patterns based on formulated core@shell structural upconversion inks are prepared on the transparent PU-CDs elastomers by a directly screen-printing method. Self-healing and integrating a series of fluorescence patterns and damaged electrical patterns can also be accomplished successfully. The designed self-healing materials provide new ideas and important guidance for developing and applying the next generation of smart materials.
研究领域:
材料科学
·
化学
·
智能材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）