REACTIVE & FUNCTIONAL POLYMERS
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2023
·
IF 5.1
Xiaoyan Sun,Wangxing Lu,Huimin Liu,LiSha Deng,Ru Zhou,Lian X. Liu,Chi-Min Shu,Juncheng Jiang
High-impact polystyrene is a widely-used construction material due to its superior comprehensive performance, but its susceptibility to fire can lead to the production of toxic and harmful gases. To address this issue, a novel, environmentally-friendly microencapsulated nitrogen‑phosphorus‑silicon flame retardant for high-impact polystyrene was prepared in this study. SiO 2 , produced by the hydrolysis condensation of tetraethyl orthosilicate , was used as the wall material, while melamine cyanurate was used as the core material. The microencapsulated nitrogen‑phosphorus‑silicon flame retardant was compounded with high-impact polystyrene and aluminum hypophosphite , and the composites were evaluated for their performance in terms of fire behavior, thermal stability, and morphology of the resulting carbon residues. When melamine cyanurate@SiO 2 and aluminum hypophosphite were added in a 1:4 ratio, the UL-94 rating of L5 reached V -0, and the LOI value increased to 27.0%. The conical calorimeter test results showed that the peak heat release rate of the L5 composite decreased by 78.7% compared to pure HIPS, and the corresponding total heat release rate decreased by 45.7%. Thermogravimetric analysis results illustrated that the amount of carbon residue increased significantly, from 2.46% to 22.26% of pure high-impact polystyrene. These findings indicate that the prepared microencapsulated nitrogen‑phosphorus‑silicon flame retardant is multifunctional, highly efficient, and can be applied to high-impact polystyrene.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Lan Luo,Fenghua Zhang,Linlin Wang,Yanju Liu,Jinsong Leng
Achieving high thermal conductivity in rigid liquid crystal-based units without compromising their superflexibility is challenging. A strategy tacking synergistic enhancement of hydrogen bonds and liquid crystal main chains to form a multidimensional cross-linking network structure is proposed. An intrinsically thermally conductive shape memory polymers with ultra-high strength, ultra-high toughness, low-temperature resistance and wear resistance were obtained. It can lift up to 10,000 times its own weight (10 kg), has a bending radius of even 0.99 mm and remains super-flexible at −190 °C, achieving an unprecedented damage tolerance for thermosetting resins and laying the foundation for its foldability. We regulate the spherical crystal size by the solvent-induced self-assembly method, achieving an intrinsic thermal conductivity of 1.2 W/m·K. We took inspiration from the bionic structure of earwig wings combined with a crease vanishing function to apply high-aspect-ratio deployment structures in aerospace, achieving compatibility between deformation and load bearing.
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Advanced Photonics Research
·
2023
·
IF 3.7
Yaoyu Liu,Tianyu Wang,Zongshuai Ji,Guanfeng Liu,Yunhe Chen,Xin Ding,Bing Teng,Shaohua Ji
Cs 3 Cu 2 Cl 5 is unstable owing to ionic migration and lattice decomposition in the atmosphere. In addition, obtaining large bulk single crystals of Cs 3 Cu 2 Cl 5 is challenging. Herein, a novel strategy is proposed for synthesizing a Cs 3 Cu 2 Cl 5 single crystal that exhibits excellent crystallinity and photoluminescence (PL) properties using an antisolvent-assisted method. Na + is doped into the Cs 3 Cu 2 Cl 5 lattice to replenish the lattice defects caused by chlorine vacancies, thus leading to stronger chemical interactions between Cu + and Cl − ions. Moreover, Na + doping circumvents ionic migration and lattice decomposition, thereby enhancing the PL intensity and maintaining the long-term stability of Cs 3 Cu 2 Cl 5 in the atmosphere. Incorporating 10% Na + into the Cs 3 Cu 2 Cl 5 lattice enhances the PL intensity by 18%, and the high-stability PL can maintain more than 48.5% of the PL intensity after 90 d in an atmospheric environment. In addition, a white light-emitting device (LED) is fabricated using the 10% Na + -doped Cs 3 Cu 2 Cl 5 crystal powder and it exhibits a high color-rendering index (93.7) and correlated color temperature (7120 K). Additionally, it exhibits superior stability, even at a high temperature of 120 °C. Thus, the excellent high-temperature stability of Cs 3 Cu 2 Cl 5 can promote its practical application in LED.
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Polymers
·
2023
·Vol. 15
·期 21
·4331
·
IF 5
Gang Wang,Wanjun Li,Shixin Qiu,Jitong Liu,Zhiting Ou,Xiaogang Li,Fei Ji,Liang Zhang,Shanshan Liu,Lili Yang,Guancheng Jiang
When drilling into a reservoir, the drilling fluid containing bentonite is prone to solid phase invasion, causing serious damage to the reservoir, and the conventional API barite suspension stability is poor, which makes it easy to cause sedimentation and blockage. Therefore, in order to avoid accidents, we use ultrafine barite to obtain a good suspension stability. More importantly, the method of modifying zwitterionic polymers on the surface of nano-silica is used to develop a temperature-resistant and salt-resistant fluid loss reducer FATG with a core-shell structure, and it is applied to ultra-fine clay-free water-based drilling fluid (WBDF). The results show that the filtration loss of clay-free drilling fluid containing FATG can be reduced to 8.2 mL, and AV can be reduced to 22 mPa·s. Although the viscosity is reduced, FATG can reduce the filter loss by forming a dense mud cake. The clay-free drilling fluid system obtained by further adding sepiolite can reduce the filtration loss to 3.8 mL. After aging at 220 °C for 15 d, it still has significant salt tolerance, the filtration loss is only 9 mL, the viscosity does not change much, a thinner and denser mud cake is formed, and the viscosity coefficient of the mud cake is smaller. The linear expansion test and permeability recovery evaluation were carried out. The hydration expansion inhibition rate of bentonite can reach 72.5%, and the permeability recovery rate can reach 77.9%, which can meet the long-term drilling fluid circulation work in the actual drilling process. This study can provide guidance for technical research in related fields such as reservoir protection.Keywords:clay-free;drilling fluid;filtration control agent;salt resistance
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 20
·7136
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IF 4.6
Zaizhong Ni,Jinting Li,Xinyi Qian,Yidan Yong,Mengmeng Wu,Yanan Wang,Wendi Lv,Simeng Zhang,Yifei Zhang,Ying Shao,Anhui Chen
Gut microbiota dysbiosis has been reported as a risk factor in the development of type 2 diabetes mellitus (T2DM). Polysaccharides fromPhellinus igniarius(P. igniarius) possess various properties that help manage metabolic diseases; however, their underlying mechanism of action remains unclear. Therefore, in this study, we aimed to evaluate the effect ofP. igniariuspolysaccharides (SH-P) on improving hyperglycemia in mice with T2DM and clarified its association with the modulation of gut microbiota and their metabolites using 16S rDNA sequencing and liquid chromatography–mass spectrometry. Fecal microbiota transplantation (FMT) was used to verify the therapeutic effects of microbial remodeling. SH-P supplementation alleviated hyperglycemia symptoms in T2DM mice, ameliorated gut dysbiosis, and significantly increased the abundance ofLactobacillusin the gut. Pathway enrichment analysis indicated that SH-P treatment altered metabolic pathways associated with the occurrence and development of diabetes. Spearman’s correlation analysis revealed that changes in the dominant bacterial genera were significantly correlated with metabolite levels closely associated with hyperglycemia. Additionally, FMT significantly improved insulin sensitivity and antioxidative capacity and reduced inflammation and tissue injuries, indicating improved glucose homeostasis. These results indicate that the ameliorative effects of SH-P on hyperglycemia are associated with the modulation of gut microbiota composition and its metabolites.Keywords:Phellinus igniarius;polysaccharide;hypoglycemia;gut microbiota;metabolites;fetal microbiota transplantation
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GREEN CHEMISTRY
·
2023
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IF 9.8
Guangxu Yang,Zhenggang Gong,Bei Zhou,Xiaolin Luo,Jing Liu,Guanben Du,Chengke Zhao,Li Shuai
Lignin is a phenolic polymer, making it a sustainable alternative to phenol for synthesizing lignin–phenol–formaldehyde (LPF) adhesives. However, technical lignins produced in pulping or biorefining processes are generally highly condensed and have low reactivity, limiting their uses in synthesizing phenolic-based adhesives. Herein, we report a two-step strategy to produce lignin-based wood adhesives with industrially available technical lignins through hydrodeoxygenation followed by acid-mediated methylolation of aromatic C2/6 positions to improve the flowability, water resistance, and crosslinking ability of lignins. We demonstrated that this biobased lignin–formaldehyde adhesive had a lighter color and far better adhesion performance compared to traditional LPF resins prepared from base-mediated methylolation of lignins. Mechanistic investigation suggests that the chemical crosslinking of methylolated lignin to form diarylmethane structures and the physical interlocking interaction at the interfaces of wood veneers contribute to the strength of plywood.
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AAPS PHARMSCITECH
·
2023
·Vol. 24
·期 8
·1-16
·
IF 3.3
Ma Lin,Mao HeYing,Xu Jing,Piao Jingshu,Piao Mingguan
Nimodipine (NMD) is a 1,4-dihydropyridine calcium antagonist that is effective in the prevention and treatment of cerebral arterial vasospasm and cerebral ischemic injury caused by subarachnoid hemorrhage. Since the drug itself is highly insoluble in water and has low oral bioavailability, while injectable formulations may cause pain and inflammation, the blood–brain barrier (BBB) prevents the effective delivery of therapeutic agents to the brain tissue. Therefore, in the present study, NMD liposomes were prepared by ethanol injection and innovatively lyophilised and loaded into temperature-sensitive in situ gels for intranasal administration as sprays to deliver drugs to brain tissues bypassing the blood–brain barrier. The optimal gel formulation was obtained by screening in which liposomes were divided into lecithin, cholesterol, and NMD in the ratio of 40:10: 1; Pluronic P407, Pluronic P188, Tween 80, polyvinyl ketone and ethyl nipagin in the ratio of (180:20:3:1:1); Pluronic P407, Pluronic P188, Tween 80, polyvinyl ketone, and ethyl nipagin in the ratio of (180:20:3:1:1). The prepared flow gel can form a solidified gel after a temperature of 31.07–32.07°C and a time of 58.51–59.89 s. Meanwhile, the NMD liposome gel formulation achieved sustained release over 56 h. The pharmacokinetic results of the developed NMD liposomal temperature-sensitive in situ gel and NMD temperature-sensitive in situ gel showed that liposomal nasal mucosal in situ gel is a more effective brain-targeted drug delivery system for NMD. Graphical Abstract
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Miao Miao Zhao,Lei Meng,Yi Yang Xu,Na Du,Fei Yen
While all of the polymorphs of NH4I and NH4Br are nonpolar, a reversible electric polarization is established in the ordered γ phases of (NH4)0.73(ND4)0.27I and (NH4)0.84(ND4)0.16Br (where D is 2H) via dc electric fields. The presence of two groups of orbital magnetic moments appears to be responsible for the asymmetric lattice distortions. Our findings provide an alternative pathway for hydrogen-based materials to potentially add a ferroelectric functionality.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Jihong Dong,Jiabang Li,Yu Huang,Jingyu Zhong,Kai Dun,Min Wu,Lijuan Zhang,Quan Chen,Bo Pan
The lack of understanding on the environmental fate and implications of heavy metals in coal gangue (CG) has restrained its utilization. Conventional extraction methods provide empirical measures of heavy metal speciation, lacking a detailed description of bound strength, which limits long-term risk assessment. In this study, the releasing and migrating behavior of six heavy metals (Cd, As, Pb, Ni, Cu, and Cr) were investigated through an approach by combining experimental and computational investigations. The corresponding mechanisms and risks were understood and discussed on a molecular level. The results suggested that CG is primarily a natural kaolinite α-quartz and anatase mineral. The sequence extraction results showed that heavy metals in CG are mainly distributed in stable silicate and iron manganese oxide-bound states. The toxicity characteristic leaching procedure test advised Cu, Cr, Ni, and Pb had a high toxic level and thus required long-term monitoring and controlling. A quantum chemical calculation demonstrated that the heavy metals were more likely to be embedded in silicate minerals with high binding energy than those binding on the anatase surface. The findings of this research provide a promising approach to comprehensively evaluate the stability mechanism and potential long-term risks of heavy metals in solid waste.
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ACS Applied Polymer Materials
·
2023
·
IF 5
Yuanyuan Chen,Hanqing Dai,Yukun Yan,Zhiyan Piao,Hanxu Lu,Zhe Hu,Wei Wei,Guoqi Zhang,Wanlu Zhang,Ruiqian Guo
In recent years, various functional fabrics capable of responding to multistimuli have been widely recognized as promising wearable devices. However, the obtained composite functional fabrics have only been applied in a few scenarios, rendering the achievement of multifunctional wearable application scenarios a difficult goal. Therefore, there is an urgent need to expand the diversity of wearable applications for functional fabrics. Herein, we design hydrogel composite fabrics capable of responding to multiple stimuli, including vibration, temperature, strain, and pressure, to enable wearable multiapplication scenarios. The hydrogel composite fabrics, based on nylon fabrics (NFs), are fabricated with polyacrylamide (PAM)–poly(vinyl alcohol) (PVA)–sodium alginate (SA)–reduced graphene oxide (rGO)/NFs (PAM–PVA–SA–rGO/NFs). The PAM–PVA–SA–rGO/NFs exhibit a higher elastic stiffness coefficient (2.79 N cm–1) than the blank NFs (1.76 N cm–1), good temperature sensitivity in the range of 30–80 °C, and excellent detecting ability for urine presence with a threshold of unit area of 2.55 × 10–3 mL cm–2. The PAM–PVA–SA–rGO/NFs can not only respond to multiple stimuli but also be integrated into clothing for wearable multiapplication scenarios, such as detecting human speaking and breathing, intelligent sleeves, and diaper alarms. Additionally, the mechanisms of the above phenomena are revealed. These results indicate that the PAM–PVA–SA–rGO/NFs will provide inspiration for the development of intelligence systems, feedback devices, soft robotics, wearable devices, etc.
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CARBON
·
2023
·
IF 10.9
Shenquan Yang,Lu Tang,Hanjun Wei,Jimei Xue,Zhijun Wang,Qingyuan Wang,Feng Zhao
Creating porous structures is a practical method for enhancing the impedance matching and interfacial polarization of dielectric materials , which in turn leads to improved electromagnetic (EM) wave absorption performance . However, the use of nanoparticles , nanorods , and two-dimensional materials to construct a simple porous structure typically has a minor effect on the EM parameters and interface polarization. To improve impedance matching and reduce the reflection of EM waves while simultaneously enhancing interfacial polarization, a more rational structure for dielectric materials is desired. Herein, a ytterbium oxide/reduced graphene oxide (Yb 2 O 3 /rGO) composite with a volcanic rock-like structure is proposed to exhibit outstanding impedance matching and loss capacity and achieve high EM wave performance. The addition of Yb 2 O 3 is utilized to induce the formation of porous structures with varying morphologies. Yb 2 O 3 not only significantly improves the polarization loss but also facilitates volcanic rock-like structure construction, thus improving the EM wave performance. As a result, the Yb 2 O 3 /rGO composites with a volcanic rock-like structure exhibit outstanding EM absorption performance, including three-band absorption (C, X, and Ku bands), as evidenced by their minimum reflection loss (RL min ) of −57.2 dB (equivalent to 99.9999% effective absorption) at 11.6 GHz when the matched thickness is 2.1 mm and an effective absorption bandwidth (EAB) of 4.2 GHz. Simulations in the CST microwave studio further validate the benefits of the composite's unique structure, which shows a radar cross-section (RCS) reduction value of up to 38.1 dB m 2 . This work offers valuable insights for the development of next-generation EM wave absorption materials through the implementation of a well-designed and distinctive structure.
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Advanced Science
·
2023
·Vol. 10
·期 31
·2304121
·
IF 15.1
Shengshun Duan,Xiao Wei,Fangzhi Zhao,Huiying Yang,Ye Wang,Pinzhen Chen,Jianlong Hong,Shengxin Xiang,Minzhou Luo,Qiongfeng Shi,Guozhen Shen,Jun Wu
As key interfaces for the disabled, optimal prosthetics should elicit natural sensations of skin touch or proprioception, by unambiguously delivering the multimodal signals acquired by the prosthetics to the nervous system, which still remains challenging. Here, a bioinspired temperature-pressure electronic skin with decoupling capability (TPD e-skin), inspired by the high-low modulus hierarchical structure of human skin, is developed to restore such functionality. Due to the bionic dual-state amplifying microstructure and contact resistance modulation, the MXene TPD e-skin exhibits high sensitivity over a wide pressure range and excellent temperature insensitivity (91.2% reduction). Additionally, the high-low modulus structural configuration enables the pressure insensitivity of the thermistor. Furthermore, a neural model is proposed to neutrally code the temperature-pressure signals into three types of nerve-acceptable frequency signals, corresponding to thermoreceptors, slow-adapting receptors, and fast-adapting receptors. Four operational states in the time domain are also distinguished after the neural coding in the frequency domain. Besides, a brain-like machine learning-based fusion process for frequency signals is also constructed to analyze the frequency pattern and achieve object recognition with a high accuracy of 98.7%. The TPD neural system offers promising potential to enable advanced prosthetic devices with the capability of multimodality-decoupling sensing and deep neural integration.
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