JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Tao Ge,Bingyi Zhou,Jingyao Xu,Yulu Wei
Ionic liquids (ILs) were selected and applied to investigate the best coal desulfurization through orthogonal tests. FTIR, XPS, SEM and contact angle tests were used to characterize the effect on the physical and chemical structures in coal for revealing the coal desulfurization mechanism by ILs-H 2 O 2 system. The orthogonal test results showed that reaction temperature and reaction time were the main influencing factors for the desulfurization rates of coal in the ILs-H 2 O 2 system, and the ILs synergy could effectively improve the desulfurization rates of H 2 O 2 . The maximum coal desulfurization rates of [BMIM][HSO 4 ], [BMIM][OTF], and [BMIM][BF 4 ] ionic liquids were 30.7%, 30%, and 33.2%, respectively. The results indicated that the alkyl groups in coal were oxidized and the contents of oxygen-containing functional groups such as hydroxyl and carbonyl increased. Coal surface underwent swelling, the internal pores increased and new pores and cracks were generated. The wettability of coal improved substantially. In addition, the physical structures changes in coal facilitated the contact between the extractant and the sulfur-containing structures. The contents of thiols and sulfides in coal significantly decreased and were oxidized to sulfoxides and sulfones, with some further oxidized to soluble sulfites or sulfates. Thus achieving removal from coal.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 38
·期 9
·973-982
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IF 3.154
Zhao Dong,Shan Shu-Xi,Zhang Meng,Zhang Xiao-A,Jiang Sheng-Ling,Lyu Ya-Fei
Vinyl-containing titanium-silphenylene-siloxane oligomers ( O1 , O2 , O3 , and O4 ) with different molar ratios of titanium to silicon were successfully synthesized in high yields by nonhydrolytic sol-gel reaction, and the obtained four oligomers were further crosslinked with methylphenyl hydro-silicone oil ( 4 ) to form corresponding polymers ( P1 , P2 , P3 , and P4 ) by hydrosilylation reaction. Their structures were characterized with spectroscopic characterization techniques including FTIR, 1 H-NMR, and Raman spectroscopy. The effect of titanium element on crosslinking behavior, thermal resistance, refractive index, transparency, thermal aging stability, glass transition temperature, and surface properties of the polymers were studied. Compared with titanium-free polymer P1 , the thermal resistance, refractive index, and thermal aging stability of titanium-silphenylene-siloxane polymers ( P2 , P3 , and P4 ) were significantly improved. The titanium-silphenylene-siloxane polymers achieved a high refractive index ( n = 1.580–1.584) and thermostability ( T 5d > 500 °C). In thermal aging, the polymers exhibited superior performances with high optical transparency (~90% at 450 nm) and exhibited high thermal stability (~84% at 450 nm after thermal aging at 150 °C for 120 h). These data indicate that the polymers have potential application in optical materials such as LED encapsulants.
研究领域:
材料科学
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聚合物化学
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光学材料
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xueqin Zhang,Sarah Keck,Yujie Qi,Stefan Baudis,Yuxia Zhao
Under natural light, lignin can produce a small amount of free radicals, resulting in yellowing of lignin-related products. However, the activity of these free radicals is very low, so that few studies on exploring the application potential of lignin as photoinitiator (PI) in photopolymerization have been reported. In this study, based on dealkaline lignin (DAL), two alkylated DAL (DAL-11ene and DAL-12ane) were synthesized through facile one-step esterification reactions between DAL and undecanoyl chloride or dodecanoyl chloride. The photoinitiation properties of DAL, DAL-11ene, and DAL-12ane were investigated by real-time FTIR spectroscopy and NIR-photorheology using 1,6-hexanediol diacrylate as a monomer. The formation of reactive species was elucidated by laser flash photolysis and electron spin resonance. The results indicated that DAL itself showed a certain photoinitiating ability, especially when it was combined with an amine co-initiator, while both DAL-11ene and DAL-12ane presented much higher photoinitiating efficiencies compared with DAL. Moreover, DAL-11ene containing a polymerizable group could be bonded into the network of final polymer products, which can increase their biosafety. 3D structures of polyacrylates were fabricated successfully using DAL-11ene and DAL-12ane as PIs through digital light processing 3D printing upon 405 nm exposure, indicating their large potentials in photopolymerization.
研究领域:
材料科学
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化学工程
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3D打印技术
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高分子化学
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产品关联
DOI
高影响因子
POLYMER
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2018
·
IF 3.483
Yanming Lin,Ling Wang,Jinsheng Zhou,Lin Ye,Huiyuan Hu,Zhongkuan Luo,Li Zhou
In this study, we grafted brush-like CBMA copolymer brushes onto the surface of PVA hydrogel membrane through photo-induced electron transfer–reversible addition fragmentation chain transfer (PET-RAFT) polymerization. ATR-FTIR, XPS , AFM , UV–Vis absorption spectra and elemental analysis were adopted to characterize the hydrogels, and equilibrium swelling, water contact angle, vitro cytotoxicity assay, protein adsorption and cells adhesion experiments were used to evaluate the related property of hydrogels. The results of ATR-FTIR and XPS showed that pCBMA was successfully grafted onto the surface of PVA hydrogel membrane. The Ra roughness of hydrogel surface in AFM increased slightly from 5.44 nm to 6.12 nm. Transmittance of the PVA-g-pCBMA hydrogel in the visible range (380 nm-780 nm) was remaining at 91.2%–97.0%. The optimal reaction conditions (CPADB: 1.20 mmol/L, Eosin Y: 0.03 mmol/L and CBMA : 358 mmol/L) were confirmed through control experiments. The equilibrium swelling and water contact angle showed that the swelling ratio increased from 2.06 cm 3 g −1 to 3.65 cm 3 g −1 , while the water contact angle decreased from 45.94° to 18.06° with the increase of grafting ratio (23.92%–55.18%). In vitro cytotoxicity assay by CCK-8 showed that the cells relative viability remained at least 90.55%. Anti-protein adsorption experiment illustrated approximately 57.2% improvement of anti-protein capacity at 37 °C, while cells adhesion experiment also showed about 64.57% improvement of anti-cells capacity. These results revealed the applicability of the oxygen tolerant PET-RAFT mechanism on the PVA modification and it was effective, feasible and non-cytotoxic method to prepare the other functional PVA hydrogel membrane.
研究领域:
材料科学
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聚合物化学
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生物医学工程
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表面科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·
IF 3
Yuhan Chen,Nian Yin,Yunfei Wang,Shanjun Gao,Chunhui Shen
A novel bio-based carbon forming agent (Mg@PA-CS) containing P and N elements was were synthesized using the complexation characteristics of chitosan (CS) and phytate (PA). The flame retardant behavior of poly(lactic acid) (PLA)/Mg@PA-CS/APP composites (addition of 20 wt% of different ratios of Mg@PA-CS and APP to polylactic acid composites) were investigated by the limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimetry test (CCT), and thermogravimetric analysis (TGA). Due to the biphasic flame retardant and synergistic effect, since the 20 wt% flame retardant system (Mg@PA-CS:APP = 1:2), PLA composites passed the UL-94 test V-0 rating, reached 34% LOI value. The peak heat release rate (PHRR) and total heat release rate (THR) were reduced to 1/2 of the pure PLA, char residue could be as high as 11.49% at 800°C. Moreover, the flame-retardant mechanism of PLA composites during thermal decomposition was analyzed using a scanning electron microscope (SEM) and the coupling techniques of TGA linked with FT-IR (TG-FTIR).
研究领域:
材料科学
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高分子科学
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消防安全工程
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Huanzheng Yang,Xiaoting Huang,Zhihang Liu,Xu Lin,Qiuyan Chen,Jiawang Li,Chenyue Zhang,Zhi Peng Kan,Zhi Qun Tian,Pei Kang Shen
Ammonia has been emerging as a sustainable and environmentally friendly fuel. However, direct electrochemical ammonia oxidation reaction (AOR) in low-temperature fuel cells seriously suffers from high overpotential and deficient durability. Herein, rhombic dodecahedron nanoframe of platinum iridium copper (PtIrCu) with high-index faceted hyperbranched nanodendrites (RDNF-HNDs) was developed using a one-step self-etching solvothermal method . The framework structure with the high-index facets enables the PtIrCu nanocrystals to expose more effective active sites. They exhibit an ultra-low onset potential of 0.33 V vs. RHE and high mass activity of 26.1 A g PtIr –1 at 0.50 V, which is 140 mV lower and 7.5 times higher than that of commercial Pt/C in the AOR. In situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy verifies that AOR on PtIrCu RDNF-HNDs prefers to the NH x dimerization pathways, effectively alleviating the poison of N ads and NO x . The theoretical calculation also shows that both introducing Cu atoms into PtIr alloy and increasing the content of Ir in PtIrCu alloy can reduce the reaction energy barrier of electrochemical dehydrogenation from *NH 2 to *NH. The specific structure of PtIrCu RDNF-NDs provides a new inspiration to solve the critical issue of electrocatalysts for AOR with low activity and durability.
研究领域:
材料科学
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电化学
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纳米技术
·
催化
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
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2021
·
IF 5.875
Degong Yang,Chao Liu,Dawei Ding,Peng Quan,Liang Fang
Though ionic liquids (ILs) as novel enhancers had garnered wide attention, detailed studies elucidating molecular design of drug-ILs were missing and mechanisms of their formation and skin permeation were still lacking. Herein, we systematically investigated effects of counterions structures on formation and skin permeation of drug-ILs. Firstly, effects of counterions on formation of drug-ILs were dependent on polarizability, molecular weight (M.W.) and polar surface area of counterions. It was caused by strong charge assisted hydrogen bond and van der Waals interactions revealed through FT-IR, X-ray photoelectron spectroscopy and molecular docking, which undermined ionic interactions and reduced total interaction strength, thereby produced lower lattice energy. Then, skin permeability of drug-ILs had a good parabola relationship with M.W., polarizability and log P of counterions. The underlying mechanism was the increased drug miscibility with stratum corneum, which caused conformational disorder and phase transition of lipid bilayers characterized by ATR-FTIR, DSC and confocal laser scanning microscopy. Finally, the drug-ILs proved to be non-irritating using in vivo skin erythema analysis. In conclusion, the quantitative structure-activity relationship models based on counterions structure to predict formation and skin permeation of drug-ILs were developed, which provided basic theory for design of drug-ILs with high permeation-enhancing efficiency.
研究领域:
药剂学
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药物化学
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材料科学
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生物物理学
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DOI
高影响因子
POLYMER
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2025
·
IF 4.5
Mengmeng Xu,Chengzhong Zong
The type of EPDM/PP TPV was the most widely used TPV with excellent mechanical property. To achieve functional property of EPDM/PP TPV, the EPDM/PP TPV compatibilized by magnesium maleate (MgMA) and maleic anhydride (MAH) was compounded with carbon nanotube (CNT) during dynamic vulcanization. The hydroxyl on CNT could reacted with the anhydride group on the graft products of polymer chains that promoted the uniform dispersion of CNT in TPV. The EPDM/PP TPV with excellent shape memory performance and electrical conductivity was successfully prepared. The successful reaction of CNT with anhydride on polymer chains in the compatibilized TPV M5C2 was verified by the result of FTIR, Raman spectrum and SEM image, which improved the mechanical performance, shape memory property and electrical conductivity of TPV M5C2 compared to TPV M0C2 with the same CNT content. TPV M5C1 obtained excellent shape memory performance with the R f of 96.0 % and R r of 93.9 %. The electrical conductivity of TPV M5C8 was as high as 1.6 × 10 −4 S·cm −1 demonstrating the formation of CNT conductive network in TPV.
研究领域:
材料科学
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高分子科学
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纳米技术
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化学工程
·
机械工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yunlai Zhang,Yan Zhang,Mengqi Jian,Ying Pei,Jie Liu,Xuejing Zheng,Keyong Tang
In this work, carboxymethylated curdlan (CMCD) was utilized as a capping and stabilizing agent for the green synthesis of silver nanoparticles. Subsequently, quaternized curdlan (QCD) was introduced as the second capping layer through electrostatic attraction, leading to the preparation of double-capped silver nanoparticles (AgNPs@CQ). The successful synthesis of silver nanoparticles was characterized using UV–vis, FTIR, XRD, TEM, and DLS. AgNPs@CQ were incorporated into gelatin and a AgNPs@CQ/Gel composite hydrogel was obtained. The incorporation of AgNPs@CQ imparts excellent antibacterial properties to the composite hydrogel, thereby enhancing its antimicrobial efficacy. The presence of double-capping layers significantly retards the release rate of silver, contributing to prolonged antimicrobial activity. The MTT and live/dead fluorescence staining results demonstrate that the gelatin hydrogel incorporating double-capped AgNPs exhibits enhanced cell viability compared to the one incorporating single-capped AgNPs. Additionally, the composite hydrogel exhibits remarkable mechanical strength and adhesive performance. The AgNPs@CQ/Gel composite hydrogel demonstrates a cost-effective and facile preparation, showing significant potential in the field of dressings.
研究领域:
材料科学
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纳米技术
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生物医学工程
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药学
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产品关联
DOI
PubMed
高影响因子
International Nano Letters
·
2016
·Vol. 7
·期 1
·1-7
·
IF 0
Memon Hafeezullah,Kumari Naveeta,Jatoi Abdul Wahab,Khoso Nazakat Ali
This research primarily deals with the photocatalytic degradation of methanol in indoor air using nanocoated indoor textiles used for curtains as household textiles. The woven polyester was coated by titanium dioxide by sol gel method, using silicon-based binder. The characterization of the coating has been done using scanning electron microscopy (SEM) image analysis, energy dispersive analysis using X-ray (EDAX) and Fourier transform infrared spectroscopy (FTIR). The DIY instrument providing the similar environment as of indoor was designed to assess the performance of the degradation of formaldehyde under UV light. The photocatalytic degradation rate was measured using the absorption value of the solutions obtained in the result of liquid chromatography of test solution and reagent solution. Different amount of dosages (1–3 %) and different time period of coatings (half hour to 3 h) have been evaluated for optimization.
研究领域:
材料科学
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环境科学
·
纺织工程
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纳米技术
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产品关联
DOI
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2017
·
IF 3.887
Leilei Sun,Bafang Li,Dandan Jiang,Hu Hou
Nile tilapia skin collagen sponges were fabricated by freeze-drying technology and modified with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide in the presence of N-hydroxysuccinimide (EDC/NHS), genipin + PBS, genipin + ethanol, tea polyphenol (TP), nordihydroguaiaretic acid (NDGA) and diphenyl phosphoryl azide (DPPA). Physicochemical and biological properties, micromorphology and compatibility before and after modification were investigated to evaluate collagen sponge as a hemostatic biomedical material. The mechanical property of collagen sponges strengthened after cross-linking. The elongation at break of cross-linked collagen sponges decreased except for EDC/NHS, which was close to that of non-crosslinked. The collagen sponge cross-linked with EDC/NHS exhibited the highest hygroscopicity in comparison with other cross-linkers. The resistance to collagenase biodegradation of collagen sponges after cross-linking strengthened significantly except for NDGA. Collagen sponges cross-linked with EDC/NHS, TP and NDGA maintained high porosity (97–98%), similar to non-crosslinked (98.42%). Collagen sponges could shorten the blood coagulation time. From the variations of the FTIR spectrum pattern and SEM, DPPA could change the secondary structure of collagen and destroy the spongy structure of collagen sponge, which was not suitable for the cross-linking of collagen sponge. Whereas, EDC/NHS was recognized as a perfect cross-linker owing to its excellent properties and porous microstructure. All fabricated collagen sponges were recognized to be biocompatible by the hemolysis assay in vitro . Therefore, collagen sponge modified with EDC/NHS could be used as a perfect biomedical hemostatic material.
研究领域:
生物医学工程
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材料科学
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生物材料
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组织工程
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产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Maofei Ni,Yongmei Ma,Zhikang Wang,Xiaodan Wang,Sixi Zhu
Lakes and artificial reservoirs present as funnels for global and regional carbon cycling. However, limited information is available about dissolved organic carbon (DOC) bioavailability , especially for its trophic controls and compositional transformations in widely distributed karst waters. Here we examined DOC biodegradation (%BDOC), temperature sensitivity (Q 10 value), nutrients and their stoichiometric ratios, as well as DOC composition over a 28-day laboratory incubation experiment in karst lakes and reservoirs. Fluorescence, Fourier transform infrared (FTIR) and UV–Visible spectroscopy were employed to trace DOC variability. We found that %BDOC ranged between 1.17% and 66.6% (median: 30.1%) at 15 °C and 5.95%–68.5% (median: 31.0%) at 30 °C, respectively. The Q 10 values were mainly distributed between 0.75 and 1.50, suggesting a large amount of degraded substrate with low activation energy. Aquatic DOC and total dissolved nitrogen (TDN) were tightly linked to the %BDOC, whereas significant phosphorus (P) limitation (TDN:TD P > 25) did not induce discernible correlations. Carbohydrates as a dominant contributor to biodegradable DOC (BDOC) largely drove DOC remineralization . The incomplete degradation of humic-like fractions increased the relative abundance of fulvic acid , tyrosine-like and tryptophan-like fractions. A distinctive mode as biological utilization of extreme active and inactive components could be summarized in the karst lakes and reservoirs. These findings hope to supplement special mechanisms of DOC transformation and fate in the context of climate change mitigation for the UN Sustainable Development Goals .
研究领域:
环境科学
·
水生生态学
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碳循环
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水资源管理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）