COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Ming Li,Xiaohong Liu,Ning Liu,Zihe Guo,Puneet Kumar Singh,Shiyu Fu
Cellulose nanocrystals (CNCs) is a kind of natural, renewable, and biocompatible materials that can be functional via the surface modification. A covalently bonded CNCs-g-PDMAEMA was prepared by grafting 2-(dimethyl-amino) ethyl methacrylate (DMAEMA) on the CNCs’ surface via atom transfer radical polymerization (ATRP). Subsequently, the tertiary amino groups of the CNCs-g-PDMAEMA were transferred to quaternary ammonium groups by adding alkyl bromides with different carbon chain lengths (C10-C18). It was found that the antibacterial activity of the prepared materials is related to the quaternary group structure. The material containing C10 alkyl in quaternary group exhibited the best antibacterial efficiency, which was closely associated with the wettability of the quaternary CNCs-based polymers. The lower wettability of materials with higher hydrophobicity may impose a restriction on the polymeric antibacterial groups’ accessibility to the cytoplasmic membrane of bacteria. The antimicrobial CNCs-based composites may be potential to apply as coating agents for aseptic packaging.
研究领域:
高分子科学
·
生物材料
·
表面化学
·
抗菌材料
·
包装材料
✓ 已验证
DOI
高影响因子
Pigment & Resin Technology
·
2022
·Vol. 53
·期 1
·114-121
·
IF 1.126
Jianqing Hu,Hongjun He,Feiliang Dai,Xingyu Gong,Haowei Huang
PurposeThe purpose of this paper is to develop the efficiency of styrene-acrylate (SA) emulsions for polymer cement waterproof coatings with improved bacteria resistance and mechanical properties.Design/methodology/approachFor effective bacteria resistance and excellent mechanical properties, various concentrations of methacryloxyethylhexadecyl dimethylammonium bromide (MHDB) were synthesised and incorporated into SA emulsions. The properties of SA emulsions modified with MHDB were characterised and compared with those of unmodified ones according to the formulations of polymer cement waterproof coatings.FindingsThe SA emulsions modified with MHDB exhibited significant enhancement of bacteria resistance and mechanical properties over the unmodified ones. The positive quaternary nitrogen and long-chain alkyl groups of MHDB in SA emulsions could attract phospholipid head groups of bacterial and insert them into the cell wall, which results in biomass leak and bactericidal effect. Moreover, MHDB as a softened monomer was beneficial to the synthesis of SA copolymer with low glass-transition temperature (Tg), then the copolymer and cement would form a more compact film which was the main reason for the enhancement of mechanical properties.Research limitations/implicationsThe modifier MHDB was synthesised from diethylaminoethyl methacrylate (DEAM) and 1-bromohexadecane. Besides, the congeners of MHDB could be synthesised from DEAM and 1-bromododecane, 1-tetradecyl dromide, 1-octadecyl bromide, etc. In addition, the efficiency of other modifications into SA emulsions for antibacterial polymer cement waterproof coatings could be studied as well.Practical implicationsThe method provided a practical solution for the improvement of water-based antibacterial acrylate polymer cement waterproof coatings.Originality/valueThe method for enhancing bacteria resistance and mechanical properties of the waterproof coating was novel and valuable.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhenghua Sun,Yahui Ji,Haicheng Wang,Jingyi Zhang,Cheng Yuan,Mingjie Kang,Yujun Feng,Hongyao Yin
The incorporation of hydroxy groups into long-chain quaternary ammonium surfactants can enhance their solubility and confer other desirable properties; however, the systematic investigation on the solution properties and the influence of molecular structures was less documented. In this work, two saturated C 18 -tailed quaternary ammonium surfactants with dual hydroxyethyl moieties, namely N , N -bis(2-hydroxyethyl)- N -methyloctadecan-1-aminium iodide (HEOAI) and N , N -bis(2-hydroxypropyl)- N -methyloctadecan-1-aminium iodide (HPOAI), were designed and synthesized. We investigated and compared their Krafft temperature ( T k ), surface activities, self-assembly behaviors, and rheological properties. Our findings demonstrate that the introduction of hydroxyethyl groups dramatically improves the solubility and surface activities. The T k of HEOAI and HPOAI is approximately 50 °C lower than that of the corresponding surfactant octadecyl trimethylammonium iodide. Both surfactants exhibit lower critical micelle concentration and equilibrium surface tension compared to those of corresponding conventional quaternary ammonium surfactant. This should be ascribed to the formation of hydrogen bonds between hydroxyl groups and water molecules. Moreover, HPOAI shows even better solubility and surface activities than HEOAI does. Additionally, the presence of two more methyl groups for HPOAI enhances its ability to form worm-like micelles in pure water. However, HEOAI shows better salt and temperature resistance for maintaining stability of worm-like micelles. A solution containing 50 mM HEOAI with 10 % NaCl exhibits temperature tolerance up to around 80 °C, indicating potential application as fracturing fluid for shallow and medium oil/gas reservoirs. These findings contribute to designing surfactants with improved solubility and diverse properties.
研究领域:
物理化学
·
胶体与界面科学
·
材料化学
·
石油工程
·
表面活性剂化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2018
·
IF 3.12
Fan Bu,Baoyu Gao,Qinyan Yue,Xue Shen,Wenyu Wang
Coagulation–ultrafiltration (C–UF) is widely used for surface water treatment. With the removal of pollutants, the characteristics of organic matter change and affect the final treatment efficiency and the development of membrane fouling . In this study, we built a dynamic C–UF set-up to carry out the treatment of micro-polluted surface water, to investigate the characteristics of dissolved organic matter from different units. The influences of poly aluminum chloride and poly dimethyldiallylammonium chloride (PDMDAAC) on removal efficiency and membrane fouling were also investigated. Results showed that the dosage of PDMDAAC evidently increased the UV 254 and dissolved organic carbon removal efficiencies, and thereby alleviated membrane fouling in the C–UF process. Most hydrophobic bases (HoB) and hydrophobic neutral fractions could be removed by coagulation. Similarly, UF was good at removing HoB compared to hydrophilic substances (HiS) and hydrophobic acid (HoA) fractions. HiS and HoA fractions with low molecule weight accumulated on the surface of the membrane, causing the increase of transmembrane pressure (TMP). Membrane fouling was mainly caused by a removable cake layer, and mechanical cleaning was an efficient way to decrease the TMP.
研究领域:
环境工程
·
水处理技术
·
膜分离
·
有机地球化学
·
给水处理
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2020
·
IF 6.71
Ziren Zhou,Shuang Yang,Kaixuan Xu,Hong Wei Qiao,Jin Xie,Zeqing Lin,Bing Ge,Jingjing He,Mengjiong Chen,Jun Zhang,Yu Hou,Hua Gui Yang
The insertion of organic spacers into halide perovskite slabs has offered a trade-off between the efficiency and stability of perovskite solar cells (PSCs). The layered structure of diammonium-intercalated cesium lead halide perovskites is virtually unexplored, in contrast to several works on the monoammonium system. In this report, we find that perovskite with 1,4-butanediammonium (BDA) and cesium cations can only form n = 1 and n = 2 layered isologues defined by the chemical formula of (BDA)Csn–1Pbn(I0.7Br0.3)3n+1, while the n = 3–4 ones will self-construct into unique heterostructures comprising separated quantum wells (QWs; n = 1–2) and 3D (n = ∞) perovskites. We highlight that the 2D/3D heterostructures show a structural resemblance to that of bulk heterojunction in organics, thus improving the charge separation and transport more than surface passivation. Solar cells based on the (BDA)Cs3Pb4I9.1Br3.9 (n = 4) absorbing layer delivered a power conversion efficiency (PCE) reaching 9.49% with ideal light and thermal stability.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
固体物理
·
化学合成
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·Vol. 39
·期 28
·16123-16131
·
IF 2.93
Yufei Wang,Shuanjin Wang,Min Xiao,Shuqin Song,Dongmei Han,Michael A. Hickner,Yuezhong Meng
Novel sulfonated poly (fluorenyl ether ketone) with pendant quaternary ammonium groups (SPFEKA) was successfully synthesized by one-pot copolymerization of bis(4-fluoro-3-sulfophenyl)sulfone disodium salt, 4,4′-difluorobenzophenone, bisphenol fluorene and 2,2′-dimethylaminemethylene-9,9′-bis(4-hydroxyphenyl) fluorene (DABPF). The chemical structures were confirmed by FT-IR, and 1 H NMR. The thermal properties were fully investigated by TGA . The synthesized copolymers SPFEKAs are soluble in aprotic solvents, and can be cast into membranes on a glass plate from their N,N′-dimethylacetamide (DMAc) solution. A new kind of amphoteric ion exchange membrane (AIEM) was obtained by immersed SPFEKA into 1 M sulfuric acid. The proton conductivities of these membranes are comparable to the most reported sulfonated polymers under the same conditions. The permeability of vanadium ions in vanadium redox flow battery (VRB) was effectively suppressed by introducing quaternary ammonium groups for Donnan exclusion effect . AIEM-20% possess a only 4.4% vanadium ion permeability of Nafion 115. Cell performance tests showed that the VRB assembled with AIEM-20% shows the highest coulombic efficiency (CE) at the current density of 50 mA/cm 2 , because of its lowest VO 2+ permeability. In conclusion, these ionomers could be promising candidates for ion-exchange membranes for VRB applications.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
膜科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 39
·45333
·
IF 1.86
Xi Yue,Wenjun Wu,Guodong Chen,Canrui Yang,Shijun Liao,Xiuhua Li
Quaternary ammonium functionalized poly(arylene ether) (QPAE-Br) membranes based on 2,2′,6,6′-tetramethyl biphenol for diffusion dialysis (DD) were designed and successfully fabricated via nucleophilic substitution polycondensation, bromination, film casting, and quaternization. The structures, thicknesses, ion-exchange capacities (IECs), water uptakes, swelling ratios, ion conductivities, and mechanical properties of QPAE-Br were used to characterize the membranes. The influence of the membrane structures on the DD performances was investigated by DD tests of simulated industrial pickling wastewater (1 mol/L HCl, 0.1 mol/L FeCl 2 ). The DD results show QPAE-a (IEC = 1.51 mmol/g) as the best DD candidate. Predialysis treatments further improved the DD performances of QPAE-Br. QPAE-a exhibited an excellent proton diffusion coefficient ( ) of 0.033 m/h and a high separation factor ( S ) of 95.45 after the predialysis treatment at room temperature; these values were much higher than those of the commercial DF-120B membrane (0.004 m/h for and 24.3 for S at 25 °C) and other reported DD membranes. QPAE-a has great potential for acid recovery via DD. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45333.
研究领域:
高分子科学
·
膜技术
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 49
·36622-36632
·
IF 3.9
Lijun Xu,Qian Tong,Bing Hu
Through a simple room-temperature process, different amounts of Keggin-type quaternary ammonium silicotungstate were successfully encapsulated into the metal–organic framework (MOF) material ZIF-67. The catalysts were characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and BET analysis. An extraction and catalytic oxidation desulfurization system was studied using H2O2 as an oxidant and a deep eutectic solvent (DES) as an extractant. Using the 43.06%-SiW12@ZIF-67 composite under optimal reaction conditions, DBT present in a model oil could be deeply and effectively removed. The catalyst was reused 6 times, and the desulfurization rate still exceeded 90%. Finally, a possible desulfurization mechanism is proposed.
研究领域:
催化
·
环境化学
·
材料科学
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 22
·期 11
·2225-2233
·
IF 2.119
Lu Juanjuan,Liu Yuelin,Liu Xinhe,Lu Xiaoquan,Liu Xiuhui
In this article, we constructed an electrochemical sensor for highly sensitive determination of β-nicotinamide adenine dinucleotide (NADH) using the poly(diallyldimethylammonium chloride)-functionalized reduced graphene oxide nanocomposite modified electrode (PDDA-rGO/GCE). The nanocomposite was characterized by transmission electron microscopy, Fourier transform-infrared spectrometry, ultraviolet-visible absorption spectrometry, cyclic voltammetry, and electrochemical impedance spectroscopy. The experimental results demonstrated that the fabricated sensor exhibited excellent electrocatalytic activity on the oxidation of NADH with a decreased about 200 mV in overpotential and 5.0-fold increment in the oxidation peak current compared to a bare GCE. Applying cyclic voltammetry, a wide linear range from 1.0 × 10 −7 to 2.9 × 10 −3 M with low limit of detection (LOD) of 3.4 × 10 −8 M and high sensitivity of 463.3 μA mM −1 cm −2 were obtained, which was superior to other NADH electrochemical sensors reported previously. Furthermore, the fabricated NADH sensor possessed excellent selectivity, reproducibility, and stability. The oxidation mechanism of NADH at the PDDA-rGO/GCE was also discussed in detail.
A simple NADH sensing platform based on PDDA-rGO composite is constructed, which exhibits an ultra-low detection limit ( 3.4×10-8 M) towards the oxidation of NADH, and the electrochemical reaction mechanism of NADH is discussed in detail.
研究领域:
生物电化学
·
生物传感器
·
纳米生物技术
·
分子诊断
·
转化医学
·
电分析化学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Qingquan Tang,Weiyi Zhang,Jiayin Yuan,Qiang Zhao
Charged cyclic polymers, e.g. cyclic DNAs and polypeptides , play enabling roles in organisms, but their synthesis was challenging due to the well-known “polyelectrolyte effect”. To tackle the challenge, we developed a templated method to synthesize a library of imidazolium and pyridinium based cyclic poly(ionic liquid)s. Cyclic templates, cyclic polyimidazole and poly(2-pyridine), were synthesized first through ring-closure method by light-induced Diels−Alder click reaction. Through quaternization of cyclic templates followed by anion metathesis, the cyclic poly(ionic liquid)s were synthesized, which paired with varied counter anions.
研究领域:
高分子化学
·
有机合成
·
功能材料
·
离子液体
·
生物医用材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Panyue Wen,Qilong Tai,Yuan Hu,Richard K. K. Yuen
Flame retardant polypropylene (PP) was obtained through appropriately blending with microencapsulated ammonium polyphosphate (MAPP) and a novel cyclotriphosphazene-based char-forming agent (CPCFA) and synthesized using a one-pot method in high yield (86.5%). An increase in the limiting oxygen index (LOI) and the observation of a vertical burning (UL-94) V-0 rating as well as the reduction of the heat release rate (HRR) and residual mass of PP/MAPP/CPCFA blends compared to those for PP/MAPP demonstrated the effectivess of a contribution of MAPP and CPCFA to PP in flame PP. Thermogravimetric analyses results demonstrated that the presence of CPCFA improved char formation for PP/MAPP/CPCFA blends in either nitrogen or air atmosphere. Finally, an outstanding water resistance was also obtained for compositions in the weight ratio range of 3:1 to 2:1 (MAPP/CPCFA). After water soaking for 72 h, a UL-94 V-0 rating was still achievable.
研究领域:
高分子材料
·
阻燃化学
·
材料科学
·
热稳定性分析
·
功能材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Can Wu,Xiaodong Wang,Junying Zhang,Jue Cheng,Ling Shi
A novel type of microencapsulated ammonium polyphosphate (MAPP) with a triallyl cyanurate (TAC)/SiO2 double-layered shell was synthesized through in-situ polymerization, followed by the thiol–ene photograted reaction. With a double bond in the TAC outer shell, MAPP could be utilized as a highly efficient flame retardant for intumescent flame-retarded natural rubber (NR). The chemical structure, morphology, and performance of MAPP were characterized by X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, water contact angle (WCA), scanning electron microscopy, and thermogravimetric analysis. MAPP exhibited a hydrophobic feature with a WCA of 101° because of its organic outer shell, which made MAPP well dispersed in the NR matrix as well as enhanced the compatibility between the MAPP and NR matrix. The resulting intumescent flame-retardant NR compounds not only achieved excellent flame-retardant performance but also obtain improved mechanical properties because of the presence of 3D-cross-linking networks between the MAPP and NR matrix. The NR/MAPP compounds also presented good water resistance because of the microencapsulation of APP with an SiO2 inner shell, which provided a waterproof barrier for APP. Based on the cone calorimetric results, the NR/MAPP compounds also presented a decline in total heat release and heat release rate but an improvement in ignition time due to the fact that both the SiO2 inner layer and TAC outer shell could enhance the formation of a high-strength thermally stable char layer during combustion, thus preventing heat transmission and diffusion. The significant enhancement in flame-retardant performance was principally ascribed to the synergistic char-forming effect derived from the APP core and TAC/SiO2 shell. This work provides a new idea for development of APP-based flame-retardant additives and also explores their potential applications in intumescent flame-retardant polymeric systems.
研究领域:
高分子材料科学
·
阻燃化学
·
功能材料
·
纳米复合材料
·
表面工程
·
热稳定性分析
·
聚合物改性
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）