OPTICAL MATERIALS
·
2023
·
IF 3.9
Lifang Wu,Jun Wang,Wenzhi Wu
In this work, photoluminescence (PL) intensity and stability of CsPbBr 3 /PbBrOH powders synthesized by one-pot method are enhanced through the encapsulation of poly (vinyl acetate) (PVA) in water. Understanding the function of PbBrOH and PVA matrix for photogenerated transition can be achieved through temperature-dependent steady-state and time-resolved PL. The enhanced PL quantum yield (65.9%) and longer lifetime indicate the strengthened structural stability and a significant reduction in nonradiative recombination of CsPbBr 3 . Negative thermal quenching can be observed and interpreted using a multilevel PL transition model. Through nanosecond time-resolved PL spectra under femtosecond laser excitation, it is revealed that the PL position shows a redshift (∼8 nm) with time delay due to the reduction of band-filling effect during the recombination of photoexcited carriers. PVA further encapsulates CsPbBr 3 /PbBrOH powders to form a flexible film, which exhibits excellent thermal and water stability due to the dual protective effects of PVA and PbBrOH. The experimental investigation demonstrates that CsPbBr 3 encapsulated by PbBrOH and PVA possesses excellent luminescent and water-resistant characteristics, making it a new choice for practical applications in LEDs and screen printing.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Jiali Yu,Jixiang Zhang,Wei Han,Bianhua Liu,Wei Guo,Liuyue Li,Nian Li,Zhenyang Wang,Jun Zhao
In cryopreservation of biological samples such as cells, the formation, growth and recrystallization of ice crystals can cause fatal mechanical damage to cells. Therefore, how to effectively regulate and inhibit ice crystals, reduce freezing damage, and improve cryopreservation efficiency is a critical scientific problem that needs to be addressed in the current cryopreservation field. In this paper, a series of PVA grafted single-layer graphite oxide (PVA-g-GO nanocomposites) with different degrees of polymerization and different proportions was ingeniously engineered by a one-step esterification reaction method to study their ice crystal control effect. The obtained PVA 17 -g-GO nanocomposite could effectively reduce the ice crystal size during the recrystallization process at low concentration by adsorption and lattice matching. The nanocomposite with a 10:1 mass ratio of PVA and GO exhibited the best ice control effect, which could reduce the ice crystal size to only 17 % of that of pure water. Surprisingly, the modification of PVA significantly enhanced the absorption value of GO in Visible and Near-Infrared light (380 nm–980 nm), giving it excellent photothermal conversion efficiency (39.7 %), accelerating ice thawing rate, and thus synergistically reducing the mechanical damage caused by ice recrystallization. Finally, using the prepared PVA 17 -g-GO as cryoprotectants (CPA), the cryopreservation experiments on Hela cells and A549 cells demonstrated that this material at low concentration of 20 μg/ml could achieve high cell survival efficiency (>85 %). The preparation and development of this efficient ice-recrystallization-inhibiting nanomaterial with bidirectional synergy can provide new ideas and methods for the safety and progress of current cryopreservation technology.
研究领域:
材料科学
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生物医学工程
·
低温生物学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 42
·14826-14833
·
IF 7.059
Sijia Ren,Jiachun Feng
Water-responsive actuators have been of increasing interest in various applications. In this work, water-responsive actuators based on the bilayer composite film were prepared using commercialized PVA and SBS by a two-step solution casting method. In order to improve the adhesion between the PVA layer and SBS layer, SBS was firstly epoxidized to improve the polarity. Immediately after a thin film was formed on the surface of the epoxidized-SBS (E-SBS)/tetrahydrofuran solution, the PVA aqueous solution was poured onto the film and dried. It was found that the adhesive property between the two layers was improved and the adhesion strength reached 1005 kPa. The resultant bilayer film displayed the water-responsive two-way shape memory effect and exhibited excellent cyclic performance in five cycles. Flower-like and claw-like actuators based on the bilayer composite film were prepared and the actuation performance was demonstrated, suggesting their potential for applications in the fields of biomedicine and sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Yiwen Zhang,Miaomiao Jiang,Yuqing Zhang,Qiping Cao,Xing Wang,Ying Han,Guangwei Sun,Yao Li,Jinghui Zhou
Although PVA–chitosan composite hydrogel has excellent biocompatibility and antibacterial ability, its poor mechanical strength limits its application for wound dressings. Furthermore, PVA–chitosan composite hydrogel cannot satisfy the requirements of wound dressing as an environmental conditioner to accelerate wound healing. In this work, a novel lignin–chitosan–PVA composite hydrogel was prepared as wound dressing. The introduction of lignin effectively improved the mechanical strength (tensile stress is up to 46.87 MPa), protein adsorption capacity, and wound environmental regulation ability of the hydrogel. In a murine wound model, the lignin–chitosan–PVA composite hydrogel significantly accelerated wound healing. The developed hydrogel provides new opportunities for highly efficient skin wound care and management.
研究领域:
材料科学
·
生物医学工程
·
伤口护理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COMPOSITE MATERIALS
·
2020
·
IF 1.972
Chang Xu,Dong Zhang
Multifunctional structural supercapacitor based on the structural electrolyte of cement/PVA-KOH composite and the structural electrode of highly electrically graphene was fabricated with sandwich structure. A bicontinuous microstructure composed of PVA and hardened cement paste is formed. Flexible PVA in cement/PVA-KOH composite increases ions’ accessibility with graphene at the interface between the structural electrode and the structural electrolyte. The addition of KOH changes the structure of PVA from crystalline state to amorphous state. So PVA can complex and discomplex with KOH to realize ionic conduction. The effects of PVA’s content, polymerization degree and hydrolysis degree on the electrochemical properties and mechanical properties were analyzed. The composite’s ionic conductivity increases with PVA’s content and hydrolysis degree, and it shows a tendency of decreasing after increasing with PVA’s polymerization degree. Similarly, the specific capacitance of the structural supercapacitor also increases with PVA’s content and hydrolysis degree, but decreases with PVA’s polymerization degree. Compared with the polymerization degree, the hydrolysis degree plays a more prominent part in affecting the specific capacitance of the structural supercapacitors. For mechanical properties of cement/PVA-KOH composite, the compressive strength is mostly improved by PVA at a content of 2%. It decreases with PVA’s polymerization degree and increases with PVA’s hydrolysis degree. The conflict between the power density and energy density in structural energy storage is eased remarkably and the electrical and mechanical properties can be improved simultaneously. The two chief obstacles are tackled in the PVA1799-based structural supercapacitor.
研究领域:
材料科学
·
电化学工程
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Huanghe Zeng,Lingling Tang,Li Huang,Na Yang,Xingyue Chen,Xi Peng,Zhengxian Chen,Jianxiu Guo,Jie Weng,Tailin Guo
The development of multifunctional antibacterial hydrogel dressings with enhanced mechanical properties and biological activity is essential for advancing wound healing strategies. In this study, we report the design and synthesis of a novel multifunctional hydrogel (PVA-Alg/FP), developed by integrating Fe 3+ , protocatechualdehyde (PA), polyvinyl alcohol (PVA), and sodium alginate (Alg). The hydrogel was crosslinked via multiple dynamic bonds and hydrogen bonds, avoiding the use of toxic crosslinking agents and eliminating the need for additional modification or purification steps. This approach enables the straightforward and efficient preparation of the hydrogel. The resulting hydrogel exhibits outstanding mechanical properties, with a tensile strength of 88.2 kPa. More importantly, compared with conventional PVA-Alg hydrogels crosslinked by glutaraldehyde or epichlorohydrin, our PVA-Alg/FP hydrogel demonstrates a diverse range of functional characteristics, including a high self-healing efficiency of 87.4 % within 10 min, as well as plasticity, ductility, adhesion, Deferoxamine mesylate (DFO)-responsive removal, and near-infrared (NIR) photothermal properties. Additionally, it demonstrates outstanding biocompatibility and a broad spectrum of biological activities, including antioxidant, anti-inflammatory, and antibacterial effects, as well as promoting cell migration. Furthermore, the hydrogel accelerates full-thickness skin wound healing in a Staphylococcus aureus ( S.aureus) -infected rat model, providing compelling evidence of its potential as a therapeutic material for infection-induced wounds.
研究领域:
生物材料学
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医学工程
·
药剂学
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产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 5
·1-15
·
IF 2.7
Qian Qian,Bao Shuxiang,Xia Juan,Lu Wangyang,Li Nan
Conductive hydrogel flexible sensors have attracted widespread attention in the field of wearable electronic devices, which typically possess the properties of stretch resistance, moisture retention, antifreeze, adhesion, and self-healing. Herein, a silk nanofiber–tannic acid (SNF@TA) is successfully introduced into a polyvinyl alcohol (PVA) hydrogel to prepare a rigid and adhesive PVA–SNF@TA organohydrogel, exhibiting good mechanical strength (up to 365 kPa) and excellent self-healing properties. Due to the presence of conductive ions and ethylene glycol, the PVA–SNF@TA organohydrogel presents high sensitivity and cold resistance (− 18 °C). Moreover, the PVA–SNF@TA organohydrogel maintains a good transparency of 91% and ultraviolet filtration capacity. A strain sensor made of PVA–SNF@TA organohydrogel has good adhesion and accurate sensing signals. Generally, the designed sensor can significantly monitor small deformations, such as frowning, blinking, smiling, and swallowing motions, showing an impressive sensitivity (gauge factor 1.094) and stable (1000 stretching cycles) variable sensing characteristics. More specifically, a pressure sensor consisted of a PVA–SNF@TA organohydrogel cylinder keeps good sensing stability, thereby desirably detecting different large movements of the human body (finger pressing, walking and running). Our work can offer a broad avenue for the advanced architecture of functional hydrogel materials, which has great potential in the field of human exercise and health monitoring. Graphical abstract
研究领域:
材料科学
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生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Meirong Xu,Siqun Liu,Jiaxin Wen,Bingyang Wang,Huifang Wang,Xiaojie Lian,Xianghua Gao,Baolong Niu,Wenfeng Li
Silver-metal organic framework (Ag@MOF) has exhibited outstanding antimicrobial activity in antimicrobial applications, and reducing the biotoxicity associated with silver has become a research priority. In this study, Ag@MOF was initially modified with sodium alginate (SA) to form SA-Ag@MOF. The results showed that SA could control the release of Ag + , reducing the release by about 8% at 24 h, and the biotoxicity was significantly reduced. Finally, SA-Ag@MOF was applied as an antimicrobial agent in citric acid-modified PVA film to develop a novel composite antimicrobial film. When added at 2 MIC , the CA3-M2 film can effectively inhibit the growth of E. coli and S. aureus , and the inhibition rate has reached 98%. For white radish packaging applications, CA3-M2 film inhibited the growth of surface microorganisms, while ensuring moisture and tissue hardness to extend shelf-life up to 7 days. Overall, the strategy conceived here can be a theoretical basis for novel antimicrobial packaging .
研究领域:
材料科学
·
生物学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Fucheng Guan,Zheng Li,Jun Tian,Yihang Zhang,Jianbing Sun,Jing Guo,Yuanfa Liu
Biomass-based aerogel fibers have attracted increasing attention due to their renewable nature. However, their disadvantages, such as low mechanical strength, poor long-range order, and easy combustion, are still significant challenges. Herein, a directed freezing-assisted forced stretching strategy is developed to fabricate sheath-core structured Ca-alginate/polyvinyl alcohol (Ca-A/PVA) aerogel fibers with Long-range-ordered pores. The Ca-A/PVA aerogel fibers (3:2 m/m) exhibit the best comprehensive mechanical properties in terms of low thermal conductivity of 0.0524 W·m −1 ·K −1 , a density of 0.1614 g·cm −3 , a porosity of 89.9 %, a tensile strength of 8.72 MPa, a tensile modulus of 249.7 MPa, a toughness of 1.98 MJ∙m −3 , and a self-extinguishing time from the fire of <1.2 s. The Ca-A/PVA fabrics showed a maximum absolute temperature difference of 11.4 °C at −20 °C and 14.0 °C at 60 °C compared to the plate temperature. The presented strategy is generalizable to other alginate-based aerogel fibers (e.g., alginate/guar gum).
研究领域:
材料科学
·
生物质材料
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Wuqi Cai,Dongpu Hu,Huying Li,He Wen,Yimeng Shi,Jing Wang,Ziwen Dai,Wenbo Yu,Sha Liang,Jiakuan Yang,Shushan Yuan
Membrane-based methods offer a promising alternative for phosphoric acid concentration, addressing the limitations of conventional techniques. In this study, we employ a pervaporation system to achieve phosphoric acid concentration, evaluating its efficiency and stability under industrial-relevant conditions. Composite PVA-COF membranes were successfully prepared through vacuum filtration of TpPa-SO 3 H nanosheets and PVA on hydrophilic polytetrafluoroethylene (PTFE) support membranes and the followed crosslinking with glutaraldehyde. The incorporation of PVA effectively eliminates boundary defects and enhances the mechanical and operational stability of the composite membrane. The optimum COF-PVA composite membrane exhibits excellent rejection of NaCl (99.9 %) and an ultrafast water flux of 268.6 kg m −2 h −1 . The water flux surpasses that of most reported membranes. Moreover, the membrane exhibited outstanding acid resistance and durability in phosphoric acid concentration tests, maintaining stable operation for 420 min at 40 °C with no phosphorus leakage detected in permeate. The membrane demonstrated notable concentration efficiency, achieving an increase in phosphoric acid concentration from 20 % to 25 % during a sustained 180-min operational period at 70 °C. This work helps to explore the prospects for the application of pervaporation membranes in the fields of seawater desalination and phosphorus chemical industry. Synopsis The hybrid membrane composed of poly (vinyl alcohol) and covalent organic framework, which is characterized by high permeate flux, salt rejection rate and acid stability.
研究领域:
材料科学
·
化学工程
·
膜技术
·
分离过程
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Yun-Fei Zhang,Ming-Ming Guo,Ya Zhang,Chak Yin Tang,Can Jiang,Yuqing Dong,Wing-Cheung Law,Fei-Peng Du
Stretchable conductive hydrogels have received significant attention due to their possibility of being utilized in wearable electronics and healthcare devices. In this work, a semi-interpenetrating polymer network (SIPN) strategy was employed to fabricate a set of flexible, stretchable and conductive composite hydrogels composed of polyvinyl alcohol (PVA) in the presence of glutaraldehyde as the crosslinker, HCl as the catalyst and poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) as the conductive medium. The results from FTIR, Raman, SEM and TGA indicate that a chemical crosslinking network and interactions of PVA and PEDOT:PSS exist in the SIPN hydrogels. The swelling ratio of hydrogels decreased with increasing content of PEDOT:PSS. Due to the chemical crosslinking network and interactions of PVA and PEDOT:PSS, PVA networks semi-interpenetrated with PEDOT:PSS exhibited excellent tensile and compression properties. The tensile strength and elongation at breakage of the composite hydrogels with 0.14 wt% PEDOT:PSS were 70 KPa and 239%, respectively. The compression stress of the composite hydrogels with 0.14 wt% PEDOT:PSS at a strain of 50% was about 216 KPa. The electrical conductivity of the hydrogels increased with increasing PEDOT:PSS content. The flexible, stretchable and conductive properties endow the composite hydrogel sensor with a superior gauge factor of up to 4.4 (strain: 100%). Coupling the strain sensing capability to the flexibility, good mechanical properties and high electrical conductivity, we consider that the designed PVA/PEDOT:PSS composite hydrogels have promising applications in wearable devices , such as flexible electronic skin and sensitive strain sensors.
研究领域:
材料科学
·
生物医学工程
·
电子皮肤
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Fanghua Luo,Min Zhang,Songlin Chen,Jianfeng Xu,Chen Ma,Guohua Chen
Highly thermally conductive polymer composites are desirable for the thermal management of modern electronic devices. Although the thermal conductivity issue has been improved effectively with many methods, it always fails in maintaining the electrical insulation performance at the same time, which has become another great challenge. Here the sandwich-structured PVA/PVA-rGO/PVA (recorded as PVA/rGO) composite films simultaneously owning high thermal conductivity, excellent electrical insulation and outstanding flexibility were designed and prepared through self-construction strategy. The obtained results show that the prepared composite films achieved a high in-plane thermal conductivity of 4.00 W m −1 K −1 with only 5 wt% rGO loading, which was about 970% higher than that of pure PVA (0.413 W m −1 K −1 ). The high thermal conductivity is attributed to the formation of the homogeneous intermediate layer of PVA-rGO. In addition, the low filler loading makes the composite film remain excellent mechanical flexibility, and the PVA in the upper and lower layers of the composite film keeps good electrical insulation (volume resistivity beyond 10 9 Ω cm). The prepared composite films not only have great potential applications in the field of thermal management and flexible electronic devices but also have the possibility to conduct the mass production of polymer composites.
研究领域:
材料科学
·
热管理
·
聚合物复合材料
✓ 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）