CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yubin Huang,Saihua Jiang,Runcan Liang,Ping Sun,Yun Hai,Lei Zhang
The use of intumescent flame-retardant (IFR) coatings is one of the most highly effective methods for polymeric materials to improve their fire safety. However, organic IFR coatings show “negative effect” in a large amount of heat and smoke release during the char-forming process. Developing nanocomposite coatings that can reduce their “negative effect” and simultaneously enhance the barrier effect of fireproof char layer is particularly desirable. Herein, a novel UV-curable IFR/MXene nanocomposite coating was developed by incorporation of surface-modified MXene nanosheets in the IFR coating system, and then constructed on the surface of rigid polyurethane (RPU) foam to fabricate coated RPU foams via spray-coating and UV-cured process. The IFR/MXene coated RPU foams show a fast self-extinguished behavior and a remarked decrease in heat and smoke production, indicating the great improvement of RPU fire safety in building. The fireproof layers combined with expanded char and MXene jammed networks generated rapidly during combustion can serve as physical shield to effectively delay the release of heat and volatile products, protecting the underlying substrate from further burning. Moreover, the mechanical properties and dispersion are enhanced due to the co-cross-linking networks between the IFR coating and MXene nanosheets. As a new member of the 2D nanomaterials, MXene nanosheets have potential to be a new choice for developing high-performance nanocomposite coating for polymers to reduce their risk of fire hazard.
研究领域:
材料科学
·
消防安全
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Xinjie Luo,Pengfei Zheng,Ke Gao,Bing Wei,Yujun Feng
Water-alternating-CO 2 gas (WAG) flooding is a common technique to enhance oil recovery via improving CO 2 sweep efficiency, but serious gas channeling may still occur, especially in reservoirs with strong heterogeneity, due to a poor blocking capacity of aqueous slugs to the “channeling” pathway induced by their low viscosity. Herein, a copolymer whose aqueous solution viscosity can be increased by both heat and CO 2 was developed and added into the aqueous slug to control gas channeling and increase oil recovery during enhanced WAG processes. The copolymer was synthesized by grafting poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) onto the triblock copolymer, Pluronic F127, PEO 100 -PPO 65 -PEO 100 . The aqueous copolymer solutions can be thickened/gelled by heating due to the formation of micelles as the physical cross-link and their entanglements even at a concentration as low as 0.2 wt%, and viscosified by bubbling CO 2 thanks to expanded copolymer coils caused by electrostatic repulsion-induced chain extension of protonated PDMAEMA chains. Notably, thermo- and CO 2 -triggered viscosifying can work synergistically and they are completely reversible upon cyclically heating/cooling the copolymer solutions and bubbling/removing CO 2 into/from the aqueous phase, respectively. In WAG flooding tests using two parallel cores, gas channeling was mitigated by blocking high-permeability cores due to in-situ thermo-induced gelation and CO 2 -triggered thickening of copolymer slugs, thus diverting chase fluids into unswept low-permeability cores and enhancing 21–22% total oil recovery than the conventional and HAPM-enhanced WAG modes. Importantly, owing to the characteristics of low initial viscosity, single component, and thermo-gelation, this dually-responsive copolymer possesses high injectivity and satisfactory gelation control. This work could enlighten the design of novel dual/multiple stimuli-thickening polymers used for channeling control and enhanced oil recovery.
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Meiqi Tang,Yitao Wu,Shunni Dong,Jingjing Nie,Binyang Du
Information encryption is essential for information security. However, constructing a collaborative multiple-information encryption system with elaborate design and intuitionistic displays is challenging. In recent years, owing to their wide applications in sensing, intelligent switch, and information encryption, stimuli-responsive fluorescent materials have attracted the attention of scientists. Inspired by the multi-component collaborative step-by-step strategy from biology, we designed and synthesized a collaborative “dual-step” stimuli-responsive fluorescent copolymer poly(NIPAm-co-1-vinylimidazole-co-Rh-2) (PNVRh-2) with high color contrast and good reversibility (>10 cycles) after treatment by multiple stimuli. Using this strategy, we introduced rhodamine units with an acid-induced ring-opening effect and an electron-rich imidazole side chain into poly(N-isopropylacrylamide) (PNIPAm). By combining these components, the conventional one-step acid-induced luminescence process was transformed into a dual-step luminescence process triggered by acid and heat. The fluorescence rate and intensity of PNVRh-2 could be manipulated by adjusting the pH and temperature. Contactless thermoprinting and erasable imaging were achieved. Furthermore, the great potential of PNVRh-2 in programmatic temperature-controlled information display and information encryption was illustrated, which offers a perspective for designing and optimizing high-performance information encryption materials.
研究领域:
材料科学
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信息加密
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 46
·26119-26126
·
IF 12.732
Boyang Yu,Wei Yang,Jia Li,Wenke Xie,Hongrun Jin,Rong Liu,Hui Wang,Xinyan Zhuang,Bei Qi,Shiyou Liu,Liang Huang,Bin Hu,Jiangjiang Duan,Jun Zhou
Harvesting heat from fire itself to power wireless sensor networks has the potential to realize effective detection and alarm for forest fires. Thermocells based on the thermogalvanic effect offer an inexpensive and scalable way for heat-to-electricity conversion but challenged by their low performance. We demonstrate a boosted thermogalvanic effect by introducing concentration gradients into a thermocell, achieving a one order magnitude enhancement of output up to 45.9 W m−2. Using a heat-triggered membrane as the start switch, a thermocell which can hibernate in peacetime and awaken when fire occurs, is further obtained. A proof-of-concept device integrated from five units successfully detects precombustion and open fire to synchronously generate a high voltage of ∼2 V for driving an alarm. This system shows promise for combating the globally increasing forest fires.
研究领域:
能源材料学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Biophotonics
·
2017
·Vol. 10
·期 12
·1607-1616
·
IF 4.328
Zhihao Han,Liwei Lv,Yi Ma,Zhaohui Wang,Yuxi Liu,Min Zhang,Siwen Li,Yueqing Gu
It is an emerging focus to explore controlled release drug delivery systems for simultaneous cancer imaging and therapy. Herein, we synthesized a photothermal sensitive multifunctional nano-liposome drug delivery system, with doxorubicin wrapped in the hydropholic layer as the therapeutical agent and cypate doped in the hydrophobic layer as the diagnostic agent. A series of in vitro and in vivo characterization demonstrated the stability of synthesized liposome, as the DL% was 9 ± 1.5 and the EE% was 82.7 ± 2.1. And the liposome achieved the functions of target-delivery, enhanced photochemical internalized drug release, and simultaneous chemotherapy and thermal therapy, indicating that this multifunctional nano-liposome is a promising drug delivery system for tumor diagnosis and targeting therapy.
研究领域:
药剂学
·
肿瘤学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yaxuan Cao,Xin Liu,Xuan Du,Xiuyan Ren,Fei Jia,Guanghui Gao
Adhesives have received extensive attention in flexible bioelectronics, wearable electronic medical devices, and biofuel cells. However, it is a challenge to achieve late regulation of performance once polymer-based gels are formed. Here, a double-network organogel composed of a hydrophilic and hydrophobic polymer network and a polyamide acid network was successfully prepared. In diverse liquid environments (including isopropyl alcohol, glycerol, epichlorohydrin, n-propanol, dichloromethane, triethanolamine, ethanol absolute, hydrogen peroxide, and ethyl acetate), the organogel adhesive demonstrated remarkable properties. It exhibits a strong tensile strength of 200 kPa, a high fracture strain reaching 560%, and an impressive adhesion strength of 38 kPa. In addition, the organogel demonstrates exceptional adhesive properties toward polytetrafluoroethylene, plastics, metals, rubber, and glass. Note that the organogel could also regulate adhesive and tough performance by thermally triggering a cyclization reaction even after the organogel has been formed. The strategy provides a new idea for designing soft materials with post-tunability.
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Cui Yande,Hu Jianhua,Dong Ziyang,Li Bing,Chang Chunyu
Pneumatic artificial muscles have been widely used in the field of robotics because of their large output force and fast actuation, however, the accompanying bulky compressors and pumps limit their miniaturized applications. Despite current untethered pneumatic artificial muscles can be driven by adjusting the internal pressure, it is challenging to structurally mimic natural muscles with high water content. Here, we propose untethered pneumatic artificial muscles comprising a hydrogel actuator with snap-through instability and an air storage chamber. These hydrogel actuators can realize the conversion from hydrophobic association of octyl acrylate moieties to host-guest interaction between β -cyclodextrin and octyl acrylate under thermal stimuli, leading to the decrease of their moduli. The inflated hydrogel actuators exhibit rapid actuation with a radial expansion speed of 200% s −1 , which are powered by snap-through instability, thermal expansion of the gas inside the hydrogel actuator, and evaporation of water on its internal surface. With the pneumatic artificial muscles miniaturized, we demonstrate diving and rolling robots, exemplifying bionic robots able to adapt to and modify the environment. We expect that the design of hydrogel actuator in miniaturized pneumatic artificial muscles will facilitate rapid locomotion for future bionic robotic platforms.
研究领域:
软体机器人
·
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2015
·Vol. 33
·期 1
·53-62
·
IF 3.081
Zhenglin Li,Ying Hu,Tingting Jiang,Kenneth A. Howard,Yonggang Li,Xuelei Fan,Ye Sun,Flemming Besenbacher,Miao Yu
Constructing novel multimodal antitumor therapeutic nanoagents has attracted tremendous recent attention. In this work, a new drug-delivery vehicle based on human-serum-albumin (HSA)-coated Prussian blue nanoparticles (PB NPs) is synthesized. It is demonstrated that doxorubicin (DOX)/HSA is successfully loaded after in situ polymerization of dopamine onto PB NPs, and the PB@PDA/DOX/HSA NPs are highly compatible and stable in various physiological solutions. The NPs possess strong near-infrared (NIR) absorbance, and excellent capability and stability of photothermal conversion for highly efficient photothermal therapy applications. Furthermore, a bimodal on-demand drug release sensitively triggered by pH or NIR irradiation has been realized, resulting in a significant chemotherapeutic effect due to the preferential uptake and internalization of the NPs by cancer cells. Importantly, the thermochemotherapy efficacy of the NPs has been examined by a cell viability assay, revealing a remarkably superior synergistic anticancer effect over either monotherapy. Such multifunctional drug-delivery systems composed of approved materials may have promising biomedical applications for antitumor therapy.
研究领域:
纳米医学
·
肿瘤学
·
药物递送
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 44
·2206201
·
IF 19.924
Xuejing Cheng,Lin Li,Lei Yang,Quan Huang,Yiwen Li,Yiyun Cheng
All-small-molecule smart hydrogels fabricated by naturally occurring and commercially available small molecular building blocks have attracted increasing interest due to their unique features such as biofunction integration and multi-stimuli responsiveness. While a few examples have been well-explored, the further development of additional kinds of all-small-molecule smart hydrogels is severely hindered by the lack of enough commensurate building blocks from nature and market. Therefore, it is crucial to seek new strategies to expand the scope of all-small-molecule dynamic covalent hydrogels using well-established natural and commercial chemicals. Herein, this issue is addressed by introducing a bifunctional adapter bearing an aldehyde group and a boronic acid group to construct a novel all-small-molecule smart hydrogel through the dynamical covalent cross-linking with naturally occurring building blocks (e.g., tobramycin and tannic acid). The prepared hydrogel presents several promising features including tunable mechanical property, multi-stimuli responsiveness, controlled drug release profiles, and excellent in vitro and in vivo antibacterial performances. This study provides a new strategy to efficiently expand the scope of the all-small-molecule smart hydrogels via the integration of the naturally occurring building blocks and the bifunctional adapters.
研究领域:
材料科学
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Xinkuo Li,Ke Sun,Jiajia Wu,Yi Liu,Linhan Li,Zhu Xiao,Zhou Li,Xiaofeng Liu,Beibei Xu,Jianrong Qiu,Dezhi Tan
Flexible regulation of bandgap of perovskite nanocrystals (PNCs) is fundamentally critical for desirable optoelectronic functions and applications. Here, regulating chemical composition and emission wavelength of PNCs in glass by a simple heat-treatment process are reported, which is established to rely on the thermal-trigger phase separation and ion exchange. The first principle calculations are overall performed to reveal the mechanism of bandgap engineering and optimization of emission performance. The PNCs exhibit excellent stability against thermal, ultraviolet irradiation, and organic molecules. The bandgap of PNCs in the heat-treated glass can also be re-modulated by ultrafast laser irradiation. Ultrafast laser direct writing of multi-color patterns and holographic dynamic displays are achieved, which hold great potential in the application of encryption-decryption and emissive devices.
研究领域:
材料科学
·
光学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 44
·2304109
·
IF 19
Yanyan Lin,Ningbo Cheng,Na Meng,Chao Wang,Xianfeng Wang,Jianyong Yu,Bin Ding
Developing dynamic moisture management of textiles is of great significance for smart clothing. However, the current pore-actuated fabric suffers from macro-dimensional deformation in response. Moreover, the fabric is limited in its ability to control the direction and speed of sweat transfer. Herein, a patterned cotton fabric (PCF) is proposed by constructing thermal-triggered transmission channels on the knitted hydrophobic cotton. The resultant fabric can switch the mode of channels spontaneously depending on ambient temperature. When PCF is exposed to the cold environment, the channels are “closed”, which prevents the intrusion of rainwater, reducing moisture permeability (12.1% lower than cotton) and maintaining human body temperature (0.8 °C higher than cotton). When the weather gets hot, channels are “open”, allowing for efficient transportation of water vapor (18.0% higher than cotton) and directional sweat transportation. This design allows adaptive water vapor gating to synergistically occur with directional liquid transport, maximizing personal warming (when cold and raining) and cooling (when hot and sweating).
研究领域:
材料科学
·
纺织工程
·
智能服装
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xiaoli Lin,Panke Zhou,Yiqun Gao,Tao Li,Xiong Chen,Haohong Li,Rong Jiang,Zhirong Chen,Huidong Zheng
Polysulfide-based multilevel memorizers are promising as novel memorizers, in which the occurrence of Sn2– relaxation is key for their multilevel memory. However, the effects of crystal packing and the side group of organic ligands on Sn2– relaxation are still ambiguous. In this work, ionic [Zn(S6)2·Zn2(Bipy)2SO4 (1), Zn(S6)2·Zn(Pmbipy)3 (2)] and neutral [ZnS6(Ombipy) (3), ZnS6(Phen)2 (4)] Zn/polysulfide/organic complexes with different packing modes and structures of organic ligands have been synthesized and were fabricated as memory devices. In both ionic and neutral Zn complexes, the S62– relaxation will be blocked by steric hindrances due to the packing of counter-cations and hydrogen-bond restrictions. Consequently, only the binary memory performances can be seen in FTO/1/Ag, FTO/2/Ag, and FTO/4/Ag, which originate from the more condensed packing of conjugated ligands upon electrical stimulus. Interestingly, FTO/3/Ag illustrates the unique thermally triggered reversible binary–ternary switchable memory performance. In detail, after introducing a methyl group on the 6′-position of bipyridine in ZnS6(Ombipy) (3), the ring-to-chain relaxation of S62– anions at room temperature will be inhibited, but it can happen at a higher temperature of 120 °C, which has been verified by elongated S–S lengths and the strengthened C–H···S hydrogen bond upon heating. The rules drawn in this work will provide a useful guide for the design of stimulus-responsive memorizers that can be applied in special industries such as automobile, oil, and gas industries.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）