INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Aili Niyazi,Chaoqun Mu,Ting Wang,Wangsheng Ye,Lvling Zhong,Zhixian He,Haoyang Xu,Zhiqiang Zhang,Liang Zhang
In this work, temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) and the guanylthiourea (GLA) were used to modify chitosan (CS) to prepare a novel PNIPAM/GLA/CS adsorbent for Ag(I) ions. Temperature variations near the lower critical solution temperature (LCST) facilitate the adjustment of functional group distribution within the composite material, thereby influencing its adsorption performance for silver ions. The characteristics of this composite material were confirmed using a variety of techniques, including scanning electron microscopy (SEM), variable-temperature ultraviolet-visible near-infrared spectroscopy, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Studies on the adsorption of Ag(I) ions by the PNIPAM/GLA/CS adsorbent indicated that the optimal pH for adsorption is 6.0. The adsorption kinetics were best described by the pseudo-second order kinetic model, while the equilibrium adsorption data aligned more closely with the Langmuir adsorption isotherm model, achieving a maximum adsorption capacity of 336.33 mg/g at 40°C. Experimental results demonstrated that higher adsorption amounts were observed above the LCST, while desorption of target ions was more favorable below the LCST. This research provides valuable insights for the design of new structural adsorbents.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Jianfeng Hu,Jianbin He,Yanping He,Xiaoming Fang,Zhengguo Zhang
Encapsulated phase change materials (MPCMs) can be used to address thermal runaway issues in electronic devices and battery systems in small spaces or flexible requirements. In this work, polyurea microcapsules incorporating h-BN and encapsulating n-eicosane were successfully synthesized. The h-BN was embedded to enhance the microcapsules' thermal conductivity. Comprehensive characterizations revealed that the microcapsules' area change rates before and after phase transition were approximately 3 %. Among the various microcapsules, h/MC-2 exhibited the best performance, with an enthalpy value of 184.37 J/g, an encapsulation efficiency of 79.72 %, and a high thermal storage efficiency of up to 99 %. Moreover, the thermal conductivity coefficient increased by 51.24 % to 0.3297 W/(m·K) due to the addition of h-BN. Mechanical properties testing was conducted on individual h/MC-2 microcapsules, revealing an average nominal rupture tension of 46.31 ± 2.09 N/m and an average Young's modulus of 0.17 ± 0.01 GPa. Furthermore, the h/MC-2 microcapsules were combined with silicone gel to prepare composites, incorporating h-BN to enhance thermal conductivity. The composites were found to reduce the simulative chip temperature by 15.90 %, demonstrating their potential application in thermal management.
研究领域:
材料科学
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热物理学
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机械工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zhichao He,Tao You,Fan Wu,Yingchun Li,Li Liu,Fei Wang,Yudong Huang
Thanks to the high affinity, adsorbents with sulfur-containing groups are usually used to recover Au ions, but neglect of the availability and utilization of introduced groups often makes the effort wasted, limiting the practical application of adsorbents severely. Here, we designed and fabricated two ANF-based aerogels with free and anchored thiourea groups respectively, and the adsorption performance and key influence factors were investigated by combining experiments and MD simulations. The experimental results showed that two aerogels exhibited distinct performance of adsorbing Au ions. And MD simulations results disclosed the structure difference of thiourea groups on the surface of two aerogels. The one with better performance had freer sulfur-containing groups, and these groups were easy to change their conformation, resulting in easier interaction with Au ions. However, groups on the surface of the other one were anchored. This difference in structure and resultant performance indicated that the freedom of functional groups play a critical role in the process of adsorption. As a result, the calculated maximum adsorption capacity of aerogels with free thiourea groups is as high as 719.42 mg/g, and although the reusability of adsorbents decreases with the increase of recycle times, caused by the generation of Au (0) during adsorption process, its adsorption capacity is till as high as 461.9 mg/g. Alternatively, incineration is also a feasible approach, especially after several recycle times, because of the low cost of fabricated adsorbents. Therefore, aerogels prepared by structural design have advantages in the field of gold recovery, and the superior performance also demonstrates the significance of utilization of introduced functional groups in the designed adsorbents.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
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2021
·Vol. 188
·期 11
·1-9
·
IF 5.833
Ren Hong-Xin,Qian Zhi-Juan,Li Min,Peng Chi-Fang,Wang Zhou-Ping,Wei Xin-Lin,Xu Jian-Guo
A core–shell QDs@mSiO 2 @y-AuNCs nanoprobe was prepared, and a new ratiometric fluorescent sensor for thiram detection was developed. The mechanism of thiram sensing was investigated using FTIR, surface-enhanced Raman, XPS spectra, etc. The sensing of thiram was mainly ascribed to the formation of Au–S bonds between thiram and Au atoms on y-AuNCs surface, resulting in the dissociation of 11-MUA ligand from the y-AuNCs surface and the charge transfer between thiram and y-AuNCs. In the ratiometric fluorescence detection of thiram based on QDs@mSiO 2 @y-AuNCs, a linear range of 0.5–60 ng/mL was obtained with a LOD of 0.19 ng/mL. Compared with the fluorescence detection based on y-AuNCs, the ratiometric fluorescence detection of thiram demonstrated 3-fold enhanced sensitivity. The improvement was ascribed to two aspects: the fluorescence emission of y-AuNCs was enhanced after they were loaded onto the QDs@mSiO 2 nanoparticles; the ratiometric detection mode provided more precise sensing. The detection of thiram can be completed immediately after mixing the nanoprobe with thiram. Good recoveries of thiram in apple and pear samples were achieved. All the above results demonstrated the high potential of this method in practical applications. Graphical abstract
研究领域:
分析化学
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食品安全
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纳米材料科学
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DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
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2016
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IF 1.947
Yong Zhu,Zhi-Shan Bai,Hua-Lin Wang
An improved biosorbent of thiourea modified chitosan microsphere (TMCM) with high specific surface, favorable mechanical strength and excellent adsorption performance had been synthesized via microfluidic technology. Polyethylene glycol was used as a significant component added in aqueous solution of chitosan to produce such microspheres through droplets forming, chemical crosslinking and pores creating. For the improvement of adsorption capacity, thiourea was considered as an excellent choice in increasing amino functional group by graft modification. The SEM, FTIR and EDS were employed to detect distinct features of TMCM. Copper(II) was used to test the adsorption performance of TMCM. The experimental results indicated that TMCM exhibited higher adsorption capacity ( q e = 60.6 mg g −1 ) and faster adsorption rate than that non-modified chitosan microsphere (NMCM). The adsorption kinetic was described well by the pseudo -second order kinetic model, which suggested that chemical adsorption along with electrons transferring was dominant in adsorption process.
研究领域:
环境科学
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材料科学
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生物工程
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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 15
·8866-8878
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IF 3.108
Ri-Zhen Huang,Bin Zhang,Xiao-Chao Huang,Gui-Bin Liang,Jian-Mei Qin,Ying-Ming Pan,Zhi-Xin Liao,Heng-Shan Wang
A series of antitumor agents based on terminal functionalized dipeptide derivatives containing the thiourea moiety were synthesized and evaluated for antiproliferative activity using a panel of cancer cell lines, and the effects and mechanism of apoptosis induction were determined. These compounds exhibited significant selectivity to different cancer cell lines with IC50 values at micromolar concentrations. In particular, compound I-11 appeared to be the most potent compound, with an IC50 = 4.85 ± 1.44 μM against the NCI-H460 cell line, at least partly, by the induction of apoptosis. Mechanistically, compound I-11 induced the activation of caspase-12 and CHOP, which triggered apoptotic signalling via the ROS-dependent endoplasmic reticulum pathway and arrested the cell cycle at the S phase. Thus, we concluded that dipeptide derivatives containing the thiourea moiety terminally functionalized by electron-withdrawing substituents may be potential antitumor agents for further investigation.
研究领域:
药理学
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肿瘤学
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细胞生物学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2021
·
IF 5.161
Man Lu,Chunmei Song,Bo Wan
Hydrophobically Modified Ethoxylated Urethanes (HEURs) were synthesized by a step growth polymerization of polyethylene glycol (PEG, M n = 4000, 6000, 8000) with isophorone diisocyanate (IPDI). The thickeners were produced with different sizes of the hydrophilic section by changing the molar ratios of reactants. The hydrophobic ends, 1-tetradecanol (C14), was constant for all prepared samples. The structure, molecular weight and polymer dispersity index (PDI) of HEUR were characterized by 1 H NMR, IR and GPC respectively. The rheological behavior of the HEUR-thickened latex (Latex/HEUR) was determined by oscillatory and flow experiments. Dramatic increases in viscosity of Latex/HEUR are obtained. Under flow conditions the Latex/HEUR fits the Cross model, showing two regions, a Newtonian and a shear thinning one. Broad thixotropy are observed in hysteresis tests and three interval thixotropy test (3ITT) with decreasing molecular weight of the prepolymer, which was analyzed using a second-order kinetic equation. The results of atomic force microscopy (AFM) and the flow-levelling performance tests for Latex/HEUR films show smoother surface and better levelling with the increase of the hydrophilic component size.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Kunpeng Song,Xue Bi,Chuang Yu,Ye-Tang Pan,Henri Vahabi,Vera Realinho,Jiyu He,Rongjie Yang
Up to now, metal–organic frameworks (MOFs) with open nanostructures have shown outstanding capabilities in trapping smoke particles compared to the original MOFs. However, only a few MOF-based strategies have been reported to synthesize hierarchical porous cages thus far, which are mainly restricted to environmentally unfriendly wet-chemical liquid methods. Herein, as a proof-of-concept, a gas-steamed metal–organic framework approach was designed to fabricate a series of cheeselike open cages with hierarchical porosity. Briefly, zeolitic imidazolate framework-67 (ZIF-67) and phytic acid were employed as precursor and etchant, respectively. Abandoning the conventional wet-chemical method, the coordination bond of ZIF-67 was cleaved by acidic steam, forming an open framework with a high specific surface area and a hierarchical porous structure. The universality of this method was also confirmed by the selection of different etchants. Impressively, they also show outstanding fume-toxic adsorption capability and labyrinth effects based on abundant and complex porous channels. At only 5 wt % loading, Co3O4@open ZIF-67 cage-2 (Co3O4@OZC-2) imparted polyurea (PUA) composites with a 21.2% limiting oxygen index, and the peak of heat release rate, total heat release, and total smoke production were reduced by around 37.5, 25.5, and 40.4%, respectively, compared to neat PUA. This work will shed light on the advanced structural design of polymer composites with high fire safety, especially smoke suppression performance, so as to obtain more feasible applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaobo Xu,Tiwei Xiao,Jingpeng Wen,Jiehua Li,Yongqian Chen,Ai Lu,Hong Tan,Changyu Tang
In this study, a two-step chemical reaction is designed in 3D printing process for fabricating polysiloxane-based polyurethane-polyurea (PSURA) 3D products with a high strength and ductility. First, an acrylic and –NCO groups-containing polysiloxane-based polyurethane (PSUA) prepolymer with good flowability is synthesized and printed into the desired 3D structure under UV irradiation. Subsequently, the residual –NCO groups in UV-crosslinked PSUA react with chain extender, resulting in the chemical growth of the crosslinked polymer network. This process significantly reinforces and toughens the printed products by increasing their molecular weight and introducing multiple hydrogen bonds. The tensile strength and elongation at break of the cured PSUA ink can be significantly increased by 330% and 60%, respectively. Due to hydrogen bond dissipation of matrix and buckling of cellular structure under compression, the printed foam with desirable structure exhibits a large energy dissipation for reducing the impact force by 68.9%, which surpasses commercial protective materials.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2012
·
IF 4.601
Yu-Peng Zhou,Mei Zhang,Yu-Hao Li,Qi-Rui Guan,Fang Wang,Zhuo-Jia Lin,Chi-Keung Lam,Xiao-Long Feng,Hsiu-Yi Chao
A series of mononuclear gold(I) acetylide complexes with urea moiety, R′3PAuC≡CC6H4-4-NHC(O)NHC6H4-4-R (R′ = cyclohexyl, R = NO2 (2a), CF3 (2b), Cl (2c), H (2d), CH3 (2e), tBu (2f), OCH3 (2g); R′ = phenyl, R = NO2 (3a), OCH3 (3b); R′ = 4-methoxyphenyl, R = H (4a), OCH3 (4b)), have been synthesized and characterized. The crystal structures of Ph3PAuC≡CC6H4-4-NHC(O)NHC6H4-4-NO2 (3a) and (4-CH3OC6H4)3PAuC≡CC6H4-4-NHC(O)NHC6H5 (4a) have been determined by X-ray diffraction. Complexes 2a–2g, 3b, and 4a–4b show intense luminescence both in the solid state and in degassed THF solution at 298 K. Anion binding properties of complexes 2a–2g, 3a–3b, and 4a–4b have been studied by UV–vis and 1H NMR titration experiments. In general, the log K values of 2a–2g with the same anion in THF depend on the substituent R on the acetylide ligand of 2a–2g: R = NO2 (2a) > CF3 (2b) ≥ Cl (2c) > H (2d) > CH3 (2e) ≈ tBu (2f) ≥ OCH3 (2g). Complex 2a with NO2 group shows the dramatic color change toward F– in DMSO, which provides an access of naked eye detection of F–.
研究领域:
无机化学
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材料化学
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分析化学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 5
·2754-2759
·
IF 3.591
Long Cao,Han-Ling Guo,Rui-Lian Lin,Zhi-Hua Zhang,Li-Fei Tian,Jing-Xin Liu,Zhu Tao
Using multiple techniques, this work studied the binding behaviors of decamethylcucurbit[5]uril (Me10Q[5]) with o-, m- and p-phenylenediamine (PDA) isomers both in the solid state and in aqueous solution. Experimental data indicate that Me10Q[5] forms exclusion complexes with the three PDA isomers, but their binding affinities are significantly different. Their different binding interactions provided an effective method to separate the three PDA isomers by using Me10Q[5]: when p-phenylenediamine interacts with Me10Q[5] in acidic medium (3.0 mol L−1 HCl), they precipitated immediately and quantitatively; m-phenylenediamine can continuously form microcrystals with Me10Q[5] after a period of time; however, o-phenylenediamine cannot form solid substances with Me10Q[5] under the same conditions.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Can Cui,Danyan Xie,Ping Lin,Haihua Hu,Siyuan Che,Ke Xiao,Peng Wang,Lingbo Xu,Deren Yang,Xuegong Yu
High-quality perovskite films with uniform coverage and large grains are indispensable to enhance the performance of perovskite solar cells with high efficiency and stability. However, solution-processed perovskite films usually possess small grains associated with abundant grain boundaries, which induce high trap state density and then seriously degrade the device performance. In this paper, the volatile Lewis base, thioacetamide (TAA), is employed as an additive to fabricate high-quality methylammonium lead iodide (MAPbI 3 ) films. The average grain size of perovskite films increases continuously with increasing TAA content and reaches a maximum value of 960 nm in the sample with 1.0% TAA. However, the average gain size drops dramatically to the value of samples without TAA when TAA content increases to 2.0%, and then the average gain size keeps nearly unchanged upon further increasing TAA content up to 10%. This unusual grain size variation tendency is attributed to the volatility of additive, and a mechanism is proposed based on various characterizations to illustrate how volatile TAA improves perovskite film crystallization. Furthermore, the device based on the MAPbI 3 film with 1.0% TAA shows a superior PCE of 18.9% and improved stability that the device with 1.0% TAA retains 88.9% of its initial performance after aging 816 h in the air with 25–35% relative humidity. The results strongly suggest that the TAA-modified MAPbI 3 films as absorber layers can significantly enhance the performance of the perovskite solar cell due to large grains, high crystallization and reduced trap state density of the high quality TAA-modified MAPbI 3 films.
研究领域:
材料科学
·
太阳能电池技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）