ACS Omega
·
2020
·
IF 2.87
Ling Chen,Weidong He,Jie Liu
Benefiting from the sol–gel technology and vacuum freeze-drying technology, a novel nanoenergetic composite material nitrated bacterial cellulose (NBC)/CL-20 (hexanitrohexaazaisowurtzitane) has been fabricated. The thermal decomposition kinetic and mechanism have been studied by thermogravimetric analysis–differential scanning calorimetry (TG–DSC) under nonisothermal conditions in a nitrogen atmosphere at multiple heating rates; the process and mechanism of thermal decomposition of NBC/CL-201:1 have also been probed by TG–DSC–IR. The kinetic and thermodynamic parameters, such as activation energy (Ea), per-exponent factor (ln AK), rate constant (k), activation heat (ΔH⧧), activation free energy (ΔG⧧), and activation entropy (ΔS⧧) are calculated. The results indicate that NBC/CL-20 presents much lower activation energy than both of raw NBC and raw NC, and NBC/CL-201:1 exhibits superior thermal performance of heat release and Ea. Moreover, there the existence mechanism has also been probed between NBC and CL-20 during the process of thermal decomposition. The structure and composition have been characterized by a series of characterization methods and indicate that CL-20 has been embedded homogenously in the NBC gel matrix with a prominent porous cross-linked network structure. The impact and friction sensitivities have also been decreased. The whole process effectively avoids high temperatures, and thus ensures operational safety.
研究领域:
材料科学
·
热力学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Junchen Liu,Kai Yang,Yudi Mo,Shuanjin Wang,Dongmei Han,Min Xiao,Yuezhong Meng
As a pivotal part of lithium-ion batteries, separator is supposed to have high strength , thermal stability and excellent wettability . In this study, polyformaldehyde/cellulose nanofibers blend separators are firstly prepared via thermally induced phase separation to improve the performance, especially the safety of LIBs. The polyformaldehyde/cellulose blend separators show considerable tensile strength (116 MPa) and Young's modulus (6.07 GPa) owing to the high crystallinity and high performance of polyformaldehyde and cellulose . In particular, benefiting from their abundant polar groups and highly porous structure , the polyformaldehyde/cellulose blend separators possess high electrolyte uptake (412%) and small contact angle (19°) as compare to the commercial polyethylene separator (115%, 58°). Moreover, the thermal treatment tests indicate that the polyformaldehyde/cellulose blend separators are thermally stable at as high temperature as 180 °C. And the polyformaldehyde/cellulose blend separators show higher ionic conductivity (1.39 mS cm −1 ) and lower interface resistance (49.5 Ω) than polyethylene separator (0.76 mS cm −1 , 136.4Ω). As expected, the LiFePO 4 /Li cell with polyformaldehyde-20-cellulose blend separators exhibit the best stable cycling performance and improved rate performance than PE separator, especially at high rate. In summary, the polyformaldehyde/cellulose blend separators are promising new kind of separator for LIBs with high safety and enhanced performance.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 28
·16850-16858
·
IF 10.733
Juan Wang,Kelong Ai,Lehui Lu
Appropriate disposal of radioactive iodine in spent nuclear fuel reprocessing represents an acknowledged challenging topic. Currently, most solid sorbents for radioactive iodine treatment are suffering from the risk of fire and explosion due to the presence of nitrogen oxides in the exhaust stream. Herein, we reported for the first time the use of porous hexagonal boron nitride (porous BN) to capture radioactive iodine and further studied its practicability and iodine-removal performance. A series of tests, such as flammability, acid leaching durability and so on, revealed the excellent thermal stability, acid-resistance, anti-oxidation activity and hydrophobic properties of porous BN. It should be highlighted that porous BN exhibits outstanding flame-retardant ability, which is superior to that of well-studied MOF and POP iodine-removal materials. These merits will enormously reduce the risk of fire and explosion in the exhaust stream and endow this material with great potential in practical radioactive waste reprocessing. Benefiting from the porous properties and Lewis acid–base interaction, porous BN demonstrated 213 wt% adsorption capacity for iodine vapor, which is a considerably high value among inorganic materials. The iodine removal performance of porous BN was further demonstrated by a column test under simulated reprocessing. Combining its superb physicochemical properties with iodine removal capacity, porous BN is thereby a promising iodine sorbent for safe and effective radioactive iodine capture in practical applications.
研究领域:
核化学与技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Wei Wang,Anthony Chun Yin Yuen,Yao Yuan,Can Liao,Ao Li,Imrana I. Kabir,Yongchun Kan,Yuan Hu,Guan Heng Yeoh
Lithium metal anode has attracted wide attention due to the highest theoretical specific capacity, the lowest anode potential, and low gravimetric density. Nevertheless, the uncontrollable growth of lithium dendrites during the cycling process may pierce through polymer separator and induce safety concerns extremely restricting the further application. In this work, nano architectured halloysite nanotubes (NHNTs) are employed to fabricate high performance poly (vinyl alcohol) composite separator (OPVA/NHNTs separator) that can effectively enhance the electrochemical performance and safety of lithium metal batteries. The results indicate that, compared to Celgard and control OPVA separators, OPVA/NHNTs separator exhibits both high Young's modulus and ion conductivity, which can efficiently retard the growth of lithium dendrites and maintain the electrochemical properties. Additionally, from the comparison between OPVA/HNTs OPVA/NHNTs separator, it can be revealed that in contrast to Monroe-Newman theory, composite separator with only high Young's modulus can hardly retard the growth of lithium dendrites, as high ion conductivity also plays a crucial role in promoting the even distribution of lithium ions, which can effectively suppress the germination of lithium whiskers. This work verifies the importance of nanomaterials in suppressing lithium dendrites and provides a new idea to employ nano science to design and fabricate high-performance polymer composite separators that can meet the electrochemical performance and safety performance of lithium metal batteries.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yuanyuan Zhu,Yunqiang Zhang,Shihang Jin,Mei Li,Hui Zhao,Jiaxi Cui,Laiying Jing
Lithium–sulfur batteries (LSBs) have broad application prospects in high density energy storage. Nevertheless, LSBs present serious safety concerns and rapid capacity decay due to the flammability and contractility of commercial separators at high temperatures and lithium polysulfide (LiPSs) dissolution. In view of this, a multifunctional modified separator is developed by combining a commercial polypropylene (PP) separator with a polyimide (PI)-Super P functional coating and a rigid nonflammable PI matrix. This PI/PP/PI-Super P separator provides multiple advantages: (i) strong physical blocking and chemical trapping/conversion ability for LiPSs, (ii) high flame-retardancy and dimensional stability, and (iii) superior electrolyte wettability and high efficiency lithium dendritic growth inhibition. As a result, the LSBs assembled with PI/PP/PI-Super P separators and pure sulfur cathodes exhibit an ultrahigh discharge specific capacity of 1611.8 mAh/g and excellent cycling performance (the average capacity attenuation within 100 cycles at 1 C is 0.469%) at 80 °C, which exceed the advanced results reported previously. More importantly, even when sulfur and organic electrolyte are adsorbed on PI/PP/PI-Super P, the modified separator still shows good flame retardancy. Additionally, this modified separator is also suitable for LSBs with high sulfur loading. This work offers an innovative design concept for safe and high-performance LSBs.
研究领域:
能量存储
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材料科学
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电池技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lin-Yun Jiang,Zhi Li,Ya-Min Liang,Qing-Qing Bi,Song Tian,Shao-Yu Lin,Zhi Hu,Yu Zheng,Jose Hobson,De-Yi Wang
It is a considerable challenge to synchronically attain a pronounced fire safety of polymers with reinforced multifunctions solely via a simple catalysis manipulation. The host–guest complex (CD@Ferr) was relatively greenly elaborated to concurrently incorporate atomic-level catalysis and bio-based flexible charring precursor. A delayed release of ferrocene to above 150 °C was evidenced due to a weak trapping effect. 2 wt% CD@Ferr ( i.e. , an unprecedentedly low iron loading of 0.008 wt%) endowed epoxy with UL-94V-0 rating and limiting oxygen index of 28.3%, together with a reduced total smoke production by 20.3%. Through a systematic mechanism investigation, a portion of ferrocene generated iron radicals to participate in a condensed-phase macro-radical quenching. The resultant atomic-level irons vigorously catalyzed a polyaromatic reaction of rigid-flexible epoxy/cyclodextrin precursors. In parallel, some ferrocene released into vapor phase was conversed to iron radicals for quenching H·/HO·. The evolved atomic-level iron compounds remarkably catalyzed the thermal oxidation of soot in the vapor phase. Intriguingly, a synchronically enhanced tensile strength and impact toughness by respective 30.4% and 85.8% were observed with an increased glass transition temperature by 24 °C owing to the weak hydrogen-bond interplay between β-CD and epoxy. Prospectively, a P/N/Si-free dual-phase successive atomic-level catalysis exploits a novel roadmap towards high-efficient fire safety and multifunctionality.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Hengrui Wang,Yue Jiang,Zhewen Ma,Yongqian Shi,Yanjun Zhu,Ruizhe Huang,Yuezhan Feng,Zubin Wang,Min Hong,Jiefeng Gao,Long-Cheng Tang,Pingan Song
MXene aerogels have shown great potential for many important functional applications, in particular electromagnetic interference (EMI) shielding. However, it has been a grand challenge to create mechanically hyperelastic, air-stable, and durable MXene aerogels for enabling effective EMI protection at low concentrations due to the difficulties in achieving tailorable porous structures, excellent mechanical elasticity, and desired antioxidation capabilities of MXene in air. Here, a facile strategy for fabricating MXene composite aerogels by co-assembling MXene and cellulose nanofibers during freeze-drying followed by surface encapsulation with fire-retardant thermoplastic polyurethane (TPU) is reported. Because of the maximum utilization of pore structures of MXene, and conductive loss enhanced by multiple internal reflections, as-prepared aerogel with 3.14 wt% of MXene exhibits an exceptionally high EMI shielding effectiveness of 93.5 dB, and an ultra-high MXene utilization efficiency of 2977.71 dB g g −1 , tripling the values in previous works. Owing to the presence of multiple hydrogen bonding and the TPU elastomer, the aerogel exhibits a hyperelastic feature with additional strength, excellent stability, superior durability, and high fire safety. This study provides a facile strategy for creating multifunctional aerogels with great potential for applications in EMI protection, wearable devices, thermal management, pressure sensing, and intelligent fire monitoring.
研究领域:
材料科学
·
电子工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xiaoqing Wang,Chengjiang Qian,Wenjie Pan
Extended utilization of polypropylene (PP) is compromised by its high flammability. Owing to the merits of easy preparation and abundance in raw materials, graphitic-like carbon nitride (g-C3N4, denoted as CN) is favored as flame retardant for PP. Nevertheless, it is hard to acquire the satisfying flame retardancy efficiency when CN dosage is low. Here, the interfacial assembly strategy is utilized to obtain the micro–nano structure of phosphorus-doped CN/CoMoO4 (PCN–Co) as flame retardant for PP. When using 2.0 wt % PCN–Co, the decomposition temperatures are markedly enhanced, confirming the delayed thermal degradation. Peak heat release rate and total heat release values are impaired by 33.6 and 12.0%, implying the inhibited release of heat. Peak smoke production rate and total smoke production values are dampened by 45.1 and 34.9%, signifying hindered emission of smoke. In short, this work provides inspiration for the design of CN-based nanostructures, mining their potentials in polymer composite fields.
研究领域:
材料科学
·
聚合物工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
You Gao,Ying-Ying Zhang,Gang Wu,Xiu-Li Wang,Yu-Zhong Wang
Polyolefin separators, such as polypropylene (PP) and polyethylene (PE) separators, are the commonly used separators for lithium batteries, which have good mechanical properties and chemical/electrochemical stability, but their high-temperature dimensional stability is poor and Li + transference number ( t Li + ) is low. Recently, much attention has been paid to developing separators with new substrates, but so far there is no separator to replace the polyolefin separator for large-scale application. Therefore, the surface modification of the polyolefin separator to enhance its functionality is a simple and effective method. Among many modified layers, the porous modified layer can store the electrolyte and provide enough space for ion transport. In this work, a hollow mesoporous silica nanosphere (mSiO 2 ) is prepared for the PP separator multifunctional coating to improve the electrochemical performance and high-temperature safety of the PP separator. The experimental and theoretical results show that the mSiO 2 coating can not only improve the electrolyte wettability and high-temperature dimensional stability of the PP separator, but also promote the Li + transport, so that the mSiO 2 /PP separator exhibits high ionic conductivity (2.35 mS cm −1 ) and high t Li + (0.63). As a result, Li//LiFePO 4 cells using mSiO 2 /PP separators exhibit excellent cycling performance, rate performance, and high-temperature safety.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanomedicine
·
2023
·
IF 8
Conglian Yang,Tingting Wu,Yuting Qin,Yan Qi,Yu Sun,Miao Kong,Xue Jiang,Xianya Qin,Yaqi Shen,Zhiping Zhang
Background Doxorubicin (DOX) is an effective chemotherapeutic agent but severe side effects limit its clinical application. Nanoformulations can reduce the toxicity while still have various limitations, such as complexity, low drug loading capability and excipient related concerns.Methods An amphiphilic conjugate, doxorubicin-dichloroacetate, was synthesized and the corresponding nanoparticles were prepared. The in vitro cytotoxicity and intracellular uptake, in vivo imaging, antitumor effects and systemic toxicities of nanoparticles were carried out to evaluate the therapeutic efficiency of tumor.Results Doxorubicin-dichloroacetate conjugate can self-assemble into nanoparticles with small amount of DSPE-PEG2000, leading to high drug loading (71.8%, w/w) and diminished excipient associated concerns. The nanoparticles exhibited invisible systemic toxicity and high maximum tolerated dose of 75 mg DOX equiv./kg, which was 15-fold higher than that of free DOX. It also showed good tumor targeting capability and enhanced antitumor efficacy in murine melanoma model.Conclusion This work provides a promising strategy to simplify the drug preparation process, increase drug loading content, reduce systemic toxicity as well as enhance antitumor efficiency.
研究领域:
药剂学
·
肿瘤学
·
纳米医学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 6
·1546-1556
·
IF 6.331
Junmei Tang,Sihao Liu,Yuemei Han,Rui Wang,Jiayi Xia,Hao Chen,Quankui Lin
Posterior capsular opacification (PCO) is an emerging complication in cataract phacoemulsification and intraocular lens (IOL) implantation surgery, mainly stemming from the adhesion, proliferation, and trans-differentiation of the post-surgery residual lens epithelial cells (LECs). Previous investigations have shown that an anti-proliferative drug eluting coating on the IOL surface provides an effective way to inhibit PCO. However, due to the undesirable elution of the anti-proliferative drug, the safety of such modification is one of the important issues to be solved. In this investigation, photodynamic coating was introduced into IOL surface modification. The photosensitizer chlorin e6 grafted α-cyclodextrin (α-CD-Ce6) was synthesized and self-assembled onto the poly(poly(ethylene glycol) methacrylate) (PPEGMA) brush established IOL surface via the supramolecular interaction between α-CD and poly(ethylene glycol) chains. The results of investigation into its optical properties, including transmittance, refractive index, and surface morphology, showed no obvious alterations after photodynamic coating modification on the IOL surface. The in vitro LEC behaviour investigation optimized the photodynamic therapy parameters when light illumination was used for the cell elimination on the photodynamic coating modified IOL. The results have also shown that this functional coating modification effectively eliminates the cells on the surface of the IOL material when treated with light illumination, whereas it keeps excellent cytocompatibility in the absence of light illumination. The investigation of the cell elimination mechanism shows that this kind of functional coating eliminates the adherent cells by ROS induced apoptosis. The in vivo implantation result confirms the excellent PCO inhibition effect, as well as their safety and biocompatibility to the surrounding tissues. As a result, the proposed photodynamic coating provides a safer and effective alternative of IOL modification for preventing PCO.
研究领域:
眼科学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2017
·Vol. 13
·期 46
·1702903
·
IF 8.643
Chunfu Lin,Shengjue Deng,David J. Kautz,Zhihao Xu,Tao Liu,Jianbao Li,Ning Wang,Feng Lin
Ti–Nb–O binary oxide materials represent a family of promising intercalating anode materials for lithium-ion batteries. In additional to their excellent capacities (388–402 mAh g –1 ), these materials show excellent safety characteristics, such as an operating potential above the lithium plating voltage and minimal volume change. Herein, this study reports a new member in the Ti–Nb–O family, Ti 2 Nb 14 O 39 , as an advanced anode material. Ti 2 Nb 14 O 39 porous spheres (Ti 2 Nb 14 O 39 -S) exhibit a defective shear ReO 3 crystal structure with a large unit cell volume and a large amount of cation vacancies (0.85% vs all cation sites). These morphological and structural characteristics allow for short electron/Li + -ion transport length and fast Li + -ion diffusivity. Consequently, the Ti 2 Nb 14 O 39 -S material delivers significant pseudocapacitive behavior and excellent electrochemical performances, including high reversible capacity (326 mAh g −1 at 0.1 C), high first-cycle Coulombic efficiency (87.5%), safe working potential (1.67 V vs Li/Li + ), outstanding rate capability (223 mAh g –1 at 40 C) and durable cycling stability (only 0.032% capacity loss per cycle over 200 cycles at 10 C). These impressive results clearly demonstrate that Ti 2 Nb 14 O 39 -S can be a promising anode material for fast-charging, high capacity, safe and stable lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）