ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Liang Shao,Ying Li,Zhonglei Ma,Yang Bai,Jie Wang,Peiyun Zeng,Pin Gong,Fuxiong Shi,Zhanyou Ji,Yang Qiao,Ran Xu,Juanjuan Xu,Guohong Zhang,Caiyun Wang,Jianzhong Ma
Conductive hydrogel-based wearable strain sensors with tough, stretchable, self-recoverable, and highly sensitive properties are highly demanded for applications in electronic skin and human–machine interface. However, currently, hydrogel-based strain sensors put forward higher requirements on their biocompatibility, mechanical strength, and sensitivity. Herein, we report a poly(vinyl alcohol)/phytic acid/amino-polyhedral oligomeric silsesquioxane (PVA/PA/NH2-POSS) conductive composite hydrogel prepared via a facile freeze–thaw cycle method. Within this hydrogel, PA acts as a cross-linking agent and ionizes hydrogen ions to endow the material with ionic conductivity, while NH2-POSS acts as a second cross-linking agent by increasing the cross-linking density of the three-dimensional network structure. The effect of the content of NH2-POSS is investigated, and the composite hydrogel with 2 wt % NH2-POSS displays a uniform and dense three-dimensional (3D) network microporous structure, high conductivity of 2.41 S/m, and tensile strength and elongation at break of 361 kPa and 363%, respectively. This hydrogel is biocompatible and has demonstrated the application as a strain sensor monitoring different human movements. The assembled sensor is stretchable, self-recoverable, and highly sensitive with fast response time (220 ms) and excellent sensitivity (GF = 3.44).
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 9
·4820-4826
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IF 0
Yixun Gao,Wei Xu,Defeng Zhu,Lei Chen,Yanyan Fu,Qingguo He,Huimin Cao,Jiangong Cheng
Compared with nitroaromatic explosive detection, nitrate ester explosive detection has not received considerable attention possibly due to the absence of an aromatic ring and their difficulty in being detected. An eight triphenylamino-pyrenyl substituted POSS (P8PT) was designed as a sensory material. POSS was chosen as the skeleton due to its nano structure, multiple reactive sites, structural similarity with nitrate esters and high thermal stability, which will contribute to large surface area induced high sensitivity, tunable sensory units number, stronger interaction force with nitrate esters and high stability. For comparison, triphenylamino-pyrene (Py-TPA) (without POSS), one and three Py-TPA substituted POSS were also synthesized and characterized. Their chemical structures, photophysical and electrochemical properties show that P8PT has a 3-D symmetrical spatial conformation, higher molar extinction coefficient, higher area-to-volume ratio, multiple exciton transfer path, and matched energy level with nitrate ester explosives, which will all contribute to highly efficient sensing performance and efficient selectivity for the detection of nitrate ester explosives such as nitroglycerin (NG). The fluorescence of the P8PT film is 63% quenched upon exposure to a saturated vapor of NG for 50 s and 92% quenched for 300 s at room temperature due to photoinduced electron transfer between the probe and NG. These results reveal that P8PT is suitable for preparing a highly sensitive and efficient thin-film device for detecting nitrate esters.
研究领域:
材料科学
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化学传感器
·
爆炸物检测
✓ 已验证
DOI
POLYMERS & POLYMER COMPOSITES
·
2015
·
IF 0.271
Xiaojing Zhang,Chong Li,Yuelei Hu,Jiashu Sun,Shaoming Fang
In this paper, a series of star-shaped poly(lactide-co-glycolide)s (sPLGA) with different block ratios were prepared by the ring-opening copolymerization of D,L-lactide (LA) and glycolide (GA) with multi-hydroxyl polyhedral oligomeric silsesquioxane core as an initiator and tin (II) 2-ethylhexanoate (Sn(Oct)2) as the catalyst. The products were characterized by NMR, FT-IR, GPC, XRD, DSC, TGA and viscosity measurements. The results show that the contents of PLA and PGA segments in sPLGA can be controlled by the feed ratios of the copolymerization. The glass transition temperature and crystallinity of sPLGA decrease and the crystalline sPLGA becomes amorphous with increasing the molar feed ratio between GA and LA from 10:90 to 50:50. The drug-loaded sPLGA microspheres were prepared by an emulsion solvent evaporation method. The morphology and the drug release property were investigated by SEM, dynamic light scattering (DLS) and ultraviolet spectrophotometry (UV). The results indicate that the sPLGA80 microsphere surface was smooth and the mean diameter was about 1.27μm. The sPLGA80 microspheres showed good drug loading and release properties.
研究领域:
材料科学
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药剂学
✓ 已验证
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 5
·770
·
IF 3.164
Benben Liu,Huiling Wang,Xiaoyan Guo,Rongjie Yang,Xiangmei Li
A novel organic-inorganic hybrid containing allyl benzoxazine and polyhedral oligomeric silsesquioxane (POSS) was synthesized by the thiol-ene (click) reaction. The benzoxazine (BOZ)-containing POSS (SPOSS-BOZ) copolymerized with benzoxazine/epoxy resin was used to prepare composites of SPOSS-PBZ-E nanocomposites(NPs). The polymerization behavior was monitored by FTIR and non-isothermal differential scanning calorimetry (DSC), which showed that the composites had completely cured with multiple polymerization mechanisms according to the oxazine ring-opening and epoxy resin (EP) polymerization. The thermal properties of the organic–inorganic polybenzoxazine (PBZ) nanocomposites were analyzed by DSC and thermogravimetric analysis (TGA). Furthermore, the X-ray diffraction analysis and the scanning electron microscopy (SEM) micrographs of the SPOSS-PBZ-E nanocomposites indicated that SPOSS was chemically incorporated into the hybrid nanocomposites in the size range of 80–200 nm. The flame retardancy of the benzoxazine epoxy resin composites was investigated by limiting oxygen index (LOI), UL 94 vertical burn test, and cone calorimeter tests. When the amount of SPOSS reached 10% or more, the vertical burning rating of the curing system arrived at V-1, and when the SPOSS-BOZ content reached 20 wt %, the thermal stability and flame retardancy of the material were both improved. Moreover, in the cone calorimeter testing, the addition of SPOSS-BOZ hindered the decomposition of the composites and led to a reduction in the peak heat release rate (pHRR), the average heat release rate (aHRR), and the total heat release (THR) values by about 20%, 25%, and 25%, respectively. The morphologies of the chars were also studied by SEM and energy dispersive X-ray spectroscopy (EDX), and the flame-retardant mechanism of POSS was mainly a condensed-phase flame retardant. The ceramic layer was formed by the enrichment of silicon on the char surface. When there are enough POSS nanoparticles, it can effectively protect the combustion of internal polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Jinqi Chen,Cong Luo,Yanhua Niu,Guangxian Li
Gel polymer electrolyte (GPE) is one of the promising candidates to overcome the defects of liquid and solid electrolyte for lithium metal batteries (LMBs). The obstacle for the practical application of GPEs lies in achieving a balance between ion transport, mechanical properties and interface stability. In this work, a star shaped polymer matrix polyhedral oligomeric silsesquioxane-polymethyl methacrylate (POSS-PMMA) is successfully synthesized with POSS as the core via atom transfer radical polymerization (ATRP) method. 1-ethyl-3-methylimidazole bis(trifluoromethanesulfon)imide ([EMIM][TFSI]) and bistrifluoromethanesulfonimide lithium salt (LiTFSI) are blended with the matrix to increase ionic conductivity. Attributed to the star structure and the lithium ion migration channel provided by POSS, the synthesized GPE possesses excellent balanced mechanical and electrochemical properties. To further stabilize the Li/GPE interface, a polymer and plastic crystalline electrolyte (PPCE) is coated as interface modification layer on both sides of GPE. Benefitting from the design, the synthesized GPE reaches a highly stable Li striping/plating cycling for 1000 h at 0.1 mA cm −2 with ionic conductivity of 3.5 × 10 −4 S cm −1 , Li + transference number of 0.35, and electrochemical stability window of 4.9 V. Furthermore, the Li||POSS-PMMA-PPCE||LiFePO 4 (LFP) full cell shows a high capacity retention of 99.5 % after 100 cycles at 0.2 C under room temperature (RT), and the high voltage Li||POSS-PMMA-PPCE||LiNi 1-x-y MnxCo y O 2 (NCM811) cell shows a high capacity retention of 88.3 % after 50 cycles at 0.1 C under RT. This work opens up a new frontier to stabilize the Li/GPE interface and enables safe operation of room temperature lithium metal batteries.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 47
·18601-18610
·
IF 3.069
Siwen Xia,Yu Yang,Changli Lü
Functionalized two-dimensional graphene oxide sheets and their inorganic–organic nanohybrids have aroused great interest because of their excellent synergetic effect on metal-based nanocatalyst PdNPs supported on highly hydrophilic quaternized polyhedral oligomeric silsesquioxane (QPOSS) functionalized reduced graphene oxide (rGO) and were successfully constructed as a nanohybrid catalyst for efficient heterogeneous catalytic reactions. Octaammonium POSS (OAPOSS) was first covalently grafted to carboxylated GO nanosheets through an amidation reaction, and then the OAPOSS decorated on rGO nanosheets was quaternized with glycidyltrimethylammonium chloride (GDTMAC) via an epoxide ring-opening reaction to obtain a highly functional hydrophilic QPOSS@rGO hybrid. Finally, the PdNPs were loaded onto QPOSS@rGO nanosheets through an in situ reduction route. The quaternary ammonium groups on QPOSS@rGO can strongly coordinate with PdNPs, making it particularly advantageous for stabilizing PdNPs and preventing the leaching of Pd metals. Compared to the PdNPs@rGO catalyst without modification with hydrophilic QPOSS, the low-dose PdNPs@QPOSS@rGO nanocatalysts exhibited outstanding catalytic efficiency in the reduction of methylene blue and nitrophenols. In addition, the as-designed nanocatalysts also showed high catalytic activity for the Suzuki coupling reaction when utilizing pure water as a green solvent. It was proved that QPOSS and rGO can synergistically catalyze and promote the diffusion of reactants. In particular, the PdNPs@QPOSS@rGO nanohybrid catalyst showed no significant loss of catalytic activity after reusing it five times. Our results demonstrated that highly hydrophilic QPOSS endows the resulting PdNPs@QPOSS@rGO nanohybrid with good dispersibility and stability in water, which remarkably further improves the catalytic activity of the nanocatalyst.
研究领域:
材料科学
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催化化学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 9
·6403-6413
·
IF 2.993
Guo Danyi,Hou Kun,Xu Shouping,Lin Yingguang,Li Li,Wen Xiufang,Pi Pihui
Superhydrophobic–superoleophilic meshes with hierarchical structures were fabricated by spraying a POSS hybrid acrylic polymer on stainless steel mesh for oil–water separation in this paper. Fourier transform infrared spectroscopy, nuclear magnetic resonance ( 1 H NMR), and thermogravimetric analyses were used to verify the chemical composition and thermostability of the POSS hybrid acrylic polymer, which was synthesized via a free radical solution polymerization. The obtained mesh was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and optical contact angle meter to confirm the morphology, composition, and wettability of the film surface. The coated mesh, with a static water contact angle of 153° and a sliding angle of 4.5°, was applied to separate a series of oil–water mixtures, such as n -hexane, isooctane, petroleum ether, kerosene, and vegetable oil, with separation efficiency nearly 99%. In addition, the coated mesh still kept separation efficiency approximately 99% even after 25 separation cycles for n -hexane/water mixture. After 20 abrasion cycles, the water contact angle of the mesh remained 145°, and separation efficiency for n -hexane/water mixture is approximately 99%, indicating the coated mesh possessed good mechanical stability. The as-prepared mesh will be a promising material in oil–water separation, due to the simple, low-cost, and easily scalable fabrication method and the excellent separation performance in radical oil–water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2018
·
IF 2.751
Dapeng Shang,Jifang Fu,Qi Lu,Liya Chen,Jintao Yin,Xing Dong,Yufeng Xu,Rongrong Jia,Shuai Yuan,Yi Chen,Wei Deng
A series of novel imidazolium-based polyhedral oligomeric silsesquioxane ionic liquids (POSS-ILs) have been successfully synthesized and used to develop new solid polymer electrolytes with high ionic conductivity and wide electrochemical windows. The POSS-ILs are added to the solid polymer electrolytes (SPEs) based on blend of polyethylene oxide (PEO), poly(vinylidene fluoride-hexafluoro propylene) (P(VDF-HFP)), propylene carbonate (PC) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) to alter the morphology, ionic conductivity , electrochemical windows properties. The results from scanning electron microscope (SEM), energy-dispersive x-ray spectrometry (EDXS) mapping and X-ray diffraction (XRD) indicate that POSS-ILs are uniformly distributed in the SPEs and form amorphous area by significantly inhibiting the crystallization of host polymer. The electrochemical studies indicate that the addition of POSS-ILs increases the ionic conductivity up to 3.9 × 10 −4 S cm −1 at 22 °C and 1.5 × 10 −3 S cm −1 at 62 °C. The electrochemical windows of POSS-ILs based SPEs are stable up to 5.0 V. As a result, the lithium-ion battery cell prepared using the POSS-ILs-SPE showed a good cycle performance and reversible capacity recovery behavior. These indicate POSS-ILs based SPEs would be good candidate to replace the conventional organic liquid electrolytes for lithium ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Lin Yang,Xueling Liu,Bingyue Song,Sixian Yang,Xiaojie Zhang,Chong Zhao,Yixiao Wu,Lei Zhang,Yanjun Huang
Effective and selective recovery of precious metal silver (Ag(I)) from wastewater can promote resource recycling and mitigate environmental pollution. In this study, dimercaptosuccinic acid (DMSA) functionalized polyhedral oligomeric silsesquioxane (POSS)-based hybrid polymer (DPHP) was synthesized and employed for the adsorption of Ag(I) from aqueous solution. The obtained adsorbent was characterized using SEM-EDS, XPS, solid-state 13 C NMR, and 29 Si NMR spectra. Batch adsorption experiments were conducted to evaluate the adsorption performance of DPHP for Ag(I). The results revealed that the maximum adsorption capacity of DPHP for Ag(I) was 494.65 mg g −1 at pH 4, and the adsorption process could be well described by pseudo-second-order and Sips models. Thermodynamic studies implied the adsorption of Ag(I) was an endothermic and spontaneous adsorption process in nature. Adsorption and desorption experiments demonstrated that the regeneration efficiency of DPHP remained above 83 % after five cycles and the preconcentration factor of DPHP was determined to be 125. Furthermore, DPHP exhibited selectivity to Ag(I) in solutions containing a variety of competitive metal ions and simulated industrial wastewater. Based on density functional theory (DFT) calculations, as well as XPS, FTIR, and Raman analyses, the interaction between Ag(I) and DPHP involved electrostatic attraction, ion exchange, and coordination, with the coordination mainly between thioether and carboxy groups and Ag(I) ions. Overall, DPHP is a promising adsorbent for the recovery of Ag(I) from aqueous solutions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Yawei Liu,Chao Liu,Xin Fu,Oukai Lin,Ziqiao Wang,Chao Wang,Chunhua Zhang
Improvement of anti-chlorine and anti-bacterial properties of membranes has been a major challenge in desalinating process. In this paper, zero-dimension cage-like structure polyhedral oligomeric silsesquioxane (POSS) was in situ armored on the surface of polyamide (PA) membrane and acted as ‘armors’ to prevent active chlorine corrosion and bacterial fouling. PA/POSS hybrid membranes could be easily achieved through a simple two-step interfacial polymerization. Anti-chlorine and anti-bacterial properties of PA/POSS hybrid membranes significantly improved during desalination by tuning the content of POSS ‘armors’. Salt rejection reached approximately 98% after immersing PA/POSS hybrid membranes in the active chlorine solution for 24 h, which showed excellent anti-chlorine property. In addition, the anti-bacterial property of PA reverse osmosis (RO) membranes extremely enhanced after armoring with POSS nanoparticles . This finding demonstrated that the structure and chemical inert nature of POSS enabled PA/POSS membranes to block active chlorine and bacteria. PA/POSS membranes provided a promising approach to improve membrane desalination.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 15
·期 6
·544-552
·
IF 4.6
Fuyue Tian,Jing Hu,Yanyan Song,Nanying Ning,Bing Yu,Ming Tian
TPU/MVQ blends are widely used in biomedical electronic equipment, intelligent wearable materials, and other fields. As they are immiscible systems, compatibilization of TPU/MVQ blends is required. Several types of compatibilizers have been developed to enhance the compatibility between TPU and MVQ, but some challenges still exist such as poor amphiphilicity and difficulties in controlling their structures. In this study, modified POSS nanoparticles (NPs) with an octahedral cage structure and reactive functional groups were used as the matrix. POSS nanoparticles with stable amphiphilicity and easily controllable structures were successfully synthesized through grafting of polydimethylsiloxane (PDMS) chains and chain segments similar to polyurethane (PU). The compatibility with silicone rubber is enhanced by the physical entanglement between PDMS chains and MVQ, while PU analogues enhance the interfacial interaction with TPU through the combined effect of physical entanglement and hydrogen bonding. After compatibilization, the average diameter (Dn) of the dispersed phase with 10 wt% compatibilizers is only ∼1/5 compared with that without a compatibilizer, and the interface thickness is 4.1 times compared with that without a compatibilizer. Moreover, due to the Pickering effect, the obtained system is stable even after annealing at 180 °C, with the Dn value of the dispersed phase only increased by 7.5%, while the Dn value of the dispersed phase increased by 45.1% when using a commercial compatibilizer (silane modified polyurethane, abbreviated as V-165). The amphiphilic POSS nanoparticles not only provide an effective compatibilization solution for the industrial development of TPU/MVQ thermoplastic vulcanizates (TPVs), but also open up new avenues for the preparation of other incompatible blend materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Hailong Liu,Ming Liu,Pengbo Zhang,Kangle Xue,Tongjie Yao,Li Liu,Yudong Huang
As an important material candidate for automotive, aviation, and aerospace, the wide application of carbon fiber-reinforced epoxy resin composites (CFRPs) was important. However, restricted by the low toughness. Herein, octaaminopropyl cage polysilsesquioxane-polyurethane prepolymer (POSS-PU) was synthesized by in-situ polymerization of PU on the POSS, and then employed as the modifier for epoxy resin (EP). Compared to pristine EP, the toughness of the 7.5 wt% POSS 0.5 -PU/EP was increased by 115.3 % without compromising the tensile strength and T g . The unnotched impact strength , interlaminar shear strength (ILSS), and flexural strength of the CFRPs prepared from the modified EP were increased by 73.5 %, 7.5 %, and 42.4 %, compared to CF/EP. Additionally, the mechanical properties of CFRPs maintained a substantial improvement under low-temperature, and the CF/7.5 wt% POSS 0.5 -PU/EP was increased by 72.9 % (impact strength) and 21.7 % (ILSS), compared to those of CF/EP. Compared to the improvement in the toughness of CFRPs at room temperature , the retention rate of toughness enhancement at low temperature was approximately 100 %. CFRPs prepared by POSS x -PU/EP offered outstanding mechanical properties and hence showed great potential for future industrial applications.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）