JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 18
·9537-9546
·
IF 4.4
Wang Yiming,Li Cui,Liu Hui,Ma Lili,Jiang Dayong,Wen Xin,Tang Tao
Abstract As a promising biodegradable polymer, poly(butylene succinate) (PBS) is limited by its inherent flammable and melt-dripping nature. In this study, the effect of molecular sieve 4A (MS4A) as synergist on thermal stability and flame retardancy of PBS/piperazine pyrophosphate (PAPP) composites was investigated. TGA results showed that the addition of MS4A could effectively improve the thermal stability of PBS/PAPP composites both in nitrogen and air atmospheres. Compared to PBS/20PAPP, PBS/17PAPP-3MS4A exhibited the optimal flame retardancy with limited oxygen index of 29.8%, V0 rating in UL-94 vertical burning test, and 86.6% reduction on the peak of heat release rate in cone calorimeter test. According to the analysis for char morphology and microstructure, the combination of PPAP/MS4A mainly imparted its flame retardancy through condensed phase. The enhancement mechanism was ascribed to their catalytic carbonization effect and the migration of MS4A to construct stronger char layer in out interface during combustion. This work provides a new intumescent flame-retardant system with high efficiency and low toxicity, which will greatly promote the widely applications of PBS composites. Graphical abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 21
·19541-19551
·
IF 2.195
Xiang Di,Hou Ying,Zhu Jiaqi,Yang Ming
In this study, we report a facile cation-exchange method to synthesize three different metal@dual sulfide hybrid nanostructures with enhanced photocatalytic properties. Starting from clusters of Au@Ag 2 S with a poorly crystalline shell, excess amounts of Cd 2+ , Zn 2+ and Pb 2+ are used to promote the thermodynamically unfavored cation-exchange under elevated temperature. The change of shell compositions accompanies the disassembly of Au@Ag 2 S clusters into monodisperse ternary core–shell nanostructures with modulated optical properties. Interestingly, it is found that Au@Ag 2 S–CdS outperforms Au@Ag 2 S–ZnS and Au@Ag 2 S–PbS in the visible-light-driven photodegradation of methylene blue, which can be largely attributed to the improved shell crystallinity, enhanced visible light absorption and appropriate band alignment for charge transfer.
研究领域:
材料科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Xiaowei Liu,Yuan Ai,Qian Chen,Sheng Liu
Lead sulfide (PbS) has drawn research interest due to its excellent optical, thermoelectric, and other physical properties. Various methods have been developed to synthesize PbS nanoparticles (NPs) for application in a variety of fields. However, most of these methods either require complex experimental conditions or are inefficient. Here, a highly efficient approach to synthesize PbS NPs, inspired by using 2,3-dimercaptosuccinic acid (DMSA) as a heavy metal chelator to treat lead, mercury, and arsenic poisoning, is reported. DMSA can attach to protein-based materials, such as human hair, using disulfide bonds (–SS–) as reaction sites. DMSA tethered to the protein-based materials can further chelate with Pb 2+ to assist in the formation of PbS NPs. Characterization of the synthesized PbS NPs demonstrated clear crystallization and uniform distribution. Furthermore, the new method is much more efficient than those previously reported, which can greatly improve the production of PbS NPs for a broad range of applications. Moreover, detailed analysis shows that all protein-based materials can function as templates for synthesizing PbS NPs due to the prevalent existence of –SS– in the natural materials.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Yanbo Li,Jinsuo Yu,Deyu Wei,Chengkai Liu,Yan Zhao,Junjia Bian,Shulin Sun,Hongwei Pan,Huili Yang,Lijing Han,Huiliang Zhang
Biodegradable materials provide protective properties comparable to conventional plastics while diminishing reliance on nonrenewable resources. Environmentally friendly polymer blends were prepared by melting poly(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate) (PHBHHx) with poly (butylene succinate) (PBS). PBS was synthesized through esterification and polycondensation using 1,4-butanediol and succinic acid, with tetrabutyltitanate as the catalyst. The PHBHHx is supplied by Bulepha®PHA Company of China, model number BP330. The effects of PHBHHx content on thermal behavior, compatibility, and thermal stability of PBS/PHBHHx blends were systematically investigated. Differential scanning calorimetry (DSC) results indicated that the addition of PHBHHx influenced the crystallization behavior, the crystallization temperature ( T c ) of PBS decreased meanwhile, the crystallization half-time of PBS is reduced to 1.5 min compared with neat PBS (5 min) after isothermal is crystallized at 95°C. Polarized Optical Microscopy (POM) images also revealed that crystallization rate accelerated in the blend with increasing PHBHHx content. Rheological and Scanning Electron Microscopy (SEM) analysis demonstrated that incorporating a significant content of PHBHHx reduced compatibility between PBS and PHBHHx. Mechanical property testing indicates that the addition of PHBHHx reduced the toughness of blends. Additionally, the addition of a small amount of PHBHHx imparts a higher crystallinity (56%) and heat resistance of the PBS/PHBHHx blends (78°C) was higher than neat PBS (74°C). Highlights Laboratory synthesis of high molecular weight PBS. Optimal ratios improved crystallinity and thermal stability of blends. A systematic study of the crystallization properties of blends.
研究领域:
材料科学
·
高分子科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yan Lei,Ruijuan Qi,Longyan Gu,Haodan Guo,Xiangrong Li,Yanyan Fang,Dongmei Xie,Zhi Zheng,Yuan Lin
Colloidal quantum dots (CQDs) are promising materials for building next-generation solution-processed, high-performance, and low-cost optoelectronic devices. The photoelectric properties of the resulting films are not only determined by the intrinsic characteristics of the CQDs but are also significantly affected by the electrical coupling between them. However, enhancing the electrical coupling in CQD-based films is still a big challenge. In this work, a two-step ligand exchange strategy has been conducted to solve the above issue, where the InZnP@PbS CQDs have been used as the case. First, the Meerwein salt (Et 3 OBF 4 ) solution in N, N -dimethylformamide (DMF) has been employed to peel off the native ligands that are strongly capped on the surface of oil-soluble CQDs, resulting in a neat surface. Second, iodide ions are linked to the neat surface of the CQDs to narrow the distance between them and passivate their defects, establishing strong electrical coupling. Transient surface photovoltage (TSPV) and photo-conductance tests confirm that the resulting InZnP@PbS–I CQDs films possess good photoelectric properties and stability. In the fabricated solid-state solar cells, 3.1 % of the photoelectric conversion efficiency (PCE) has been achieved under 1 sun. The current results are outstanding for III-V group CQD-based all solid-state solar cells.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Libo Yu,Zhen Li,Weiqiang Qiao,Junke Wang,Chengshuang Zhao
Light harvesting plays crucial role for high photovoltaic performance of quantum dots sensitized solar cell (QDSSC). However, there are still issues need to be tackled, such as enlarging light response range and enhancing light scattering capability. In this work, TiO 2 eggshell hollow microspheres (EHMS) were synthesized by carbonaceous microspheres (CMS) template method and co-sensitized by CdS/CdSe/PbS quantum dots (QDs) for application in QDSSC . Compared with QDSSC based on TiO 2 nanoparticles (NP) and TiO 2 hollow microspheres (HMS), the TiO 2 EHMS based QDSSC showed a remarkable increase of short-circuit current density (J sc ) to 24.81 mA cm −2 with a power conversion efficiency (PCE) of 4.07 %. Photoelectrochemical analysis of QDSSC indicate that CdS/CdSe/PbS QDs can enlarge the light response range, and the TiO 2 EHMS improve the light scattering, leading to the improvement of light harvesting efficiency. Charges dynamics tests results proved that a larger charges recombination resistance at photoanode/electrolyte interface and longer electron lifetime can be achieved with TiO 2 EHMS, contributing to the boost of J sc . The presented study introduces a simple strategy for researchers interested in designing photoanode for various photoelectrochemical applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-7
·
IF 5.705
Wang Panpan,Cao Ling,Wu Ying,Di Junwei
Under visible-light irradiation, a cathodic photoelectrochemical (PEC) sensor is presented for highly sensitive determination of Cr(VI) at a potential of −0.25 V (vs SCE). PbS quantum dots (QDs) were capped with mercaptoacetic acid and assembled on the surface of an indium tin oxide (ITO) electrode via the linker poly(diallyl dimethyl ammonium chloride) providing a photoactive sensor. Cr(VI) accepts the photoelectrons generated by the PbS QDs. This promotes the separation of electron holes and enhances the cathodic photocurrent generated by a 470-nm LED. The sensor has 10 pM detection limit and a linear working range from 0.02 nM to 2 μM of chromate. The method was successfully applied to the determination of Cr(VI) and total chromium in spiked environmental water samples.
Schematic illustration of the photocurrent enhancement response of ITO/PbS toward chromium(VI). In the presence of Cr(VI) (red line), Cr(VI) accepts the photoelectrons generated by the PbS QDs under 470-nm LED irradiation, resulting in improved photocurrent of ITO/PbS.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Ke-Lei Zu,Hai-Liang Long,Ji-Xiong Zhao,Jun-Tao Hu,Deng-Ke Wang,Nan Chen,Yin-Fen Ma,Jian Xu,Jun-Liang Li,Qi Zhan,Feng Qiu,Bin Xu,Chang-Sheng Shi,Mei Leng,Yong-Biao Zhao,Zheng-Hong Lu
PbS colloidal quantum dots (CQDs) have attracted significant attention as light sources and photodetectors in the second near-infrared (NIR-II) window for optical communication, bioimaging, and night vision. Recently, a room-temperature direct synthesis of PbS CQD inks has been developed, enabling low-cost and large-scale fabrication of QD optoelectronic devices. However, the synthesis of high-quality large-sized CQDs with photoluminescence (PL) peaks beyond 1550 nm remains challenging. In this work, we developed a novel room-temperature cation-exchange synthesis strategy in a polar solvent system. Distinct from existing approaches, the strategy employs ZnS nanoseeds as the sulfur precursor, enabling tunable PL peaks in the range of 1050–1650 nm by precisely controlling the reaction kinetics. The in situ passivation by Zn cations and acetate anions effectively reduces surface defects on the nonpolar (100) facets. Based on this strategy, we fabricated near-infrared II (NIR-II) light-emitting diodes (LEDs) exhibiting a maximum radiance of 22.15 W sr −1 m −2 , together with a record-breaking critical current density for external quantum efficiency (EQE) roll-off ( J 1/2EQE = 3.4 A cm −2 ). Furthermore, NIR-II photodetectors demonstrate a high photoresponsivity of 0.68 A W −1 and a specific detectivity of 1.12 × 10 11 Jones at 1490 nm.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Jin Xu,Yanfei Chen,Yuanfang Tian,Zhaojie Yang,Zhixin Zhao,Wenhao Du,Xi Zhang
As a promising biodegradable resin, poly (butylene succinate) (PBS) is often blended with starch to reduce the cost. In this paper, 1-buyl-3-methylimidazolium halide pre-plasticized corn starch (CS) was blended with PBS to prepare PBS/corn starch blend material modified by ionic liquid (PBS/CS-IL). Ionic liquid (IL) acted as plasticizer and compatibilizer, and the effects of 1-butyl-3-methylimidazolium halide with different halogen anion on PBS/Starch blends were explored. The effects of IL on the structure and tensile property of PBS/Starch blends were evaluated by FTIR, SEM, DSC , TGA and XRD, respectively. Test results showed that the addition of IL significantly reduced the crystallinity of PBS/Starch blends, and the size of starch particles in the PBS matrix was also effectively reduced. IL also acted as a compatibilizer of starch and PBS, and induced the morphology of the blends to change from “sea-island” structure to homogeneous phase. The results of the tensile test showed that compared with the PBS/Starch blend without IL, the elongation at break of PBS/CS-IL increased from 22% to 93%. This study provided a simple and feasible method for the preparation of low-cost PBS bio-composite materials, and provided theoretical support for future industrial production.
研究领域:
材料科学
·
生物降解材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Xiaopeng Yue,Panpan Cao,Miaoxiu Yang,Chaofan Li,Zhiwei Wang
A modified intumescent flame retardants/montmorillonite synergist with highly fire resistance and smoke suppression efficiency, based on the surface and interfacial modification of tannin , including bistratal microencapsulated ammonium polyphosphate particles (TFR), and Fe 3+ chelated tannin exfoliated montmorillonite nanoparticles (TM), was fabricated and used to prepare PBS based composites. TM exhibited excellent flame retardant and smoke suppression efficiency. With the incorporation of 5 wt% TM (95P/5TM), 30.8 % of limited oxygen index (LOI) value and UL-94 V-1 rating of composite could be achieved, and the total smoke production (TSP) of 95P/5TM decreased by 77.4 % compared with pure PBS, indicating its excellent smoke suppression effect. When the TFR and TM loadings were 24 wt% and 1 wt%, respectively, 36.8 % of LOI value and UL-94 V-0 rating of composite (75P/24TR/1TM) could be achieved, as well as 62.9 % lowered TSP compared with pure PBS. Tannin participated in both the condensed phase and gaseous phase reactions, and improved the carbon forming capacity during combustion. The enhanced flame retardant and smoke suppression efficiency for synergist were a combined result of catalytic, synergistic and physical shielding effects. This work offers a novel routing for fabricating polymer composites with excellent flame retardant and smoke suppression efficiency with the incorporation of natural polyphenols.
研究领域:
材料科学
·
阻燃材料
✓ 已验证
产品关联
DOI
高影响因子
Environmental Progress & Sustainable Energy
·
2025
·
IF 2.3
Zhengxiong Jiang,Zhitao Han
With the aim to develop wet denitration process for marine application, it is still challenging to simultaneously achieve high-efficiency NO x removal from flue gas and low nitrate concentration in scrubbed solution. Herein a novel two-step method was proposed to solve this issue: phosphate buffer solution (PBS) with organic additive was used to absorb NO x efficiently from flue gas, and in next step, Na 2 SO 3 as a reductant was added in the scrubbed solution to reduce NO x off-line. Five typical organic additives were chosen to compose with PBS. The tetrabutylammonium bromide and phosphate buffer solution (TBAB/PBS) composite solution exhibited superior NO x absorption performance. Furthermore, the effects of TBAB concentration, NO x oxidation degree, solution pH, temperature and O 2 concentration on NO x absorption performance of TBAB/PBS composite solution were investigated systematically, and a high NO x absorption efficiency of >90% could be achieved. It was mainly attributed to a physical complex between PBS and NO 2 , N O 3 − $$ N{O}_3^{-} $$ , N O 2 − $$ N{O}_2^{-} $$ , together with a mass transfer enhancement by TBAB. A long-run test showed that nitrate concentration was much lower than the limit value of IMO. Cyclic absorption and regeneration tests confirmed that Na 2 SO 3 could effectively regenerate the scrubbed solution in the absence of O 2 .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SUPERLATTICES AND MICROSTRUCTURES
·
2016
·
IF 2.117
Jingni Wang,Kai Yao,Zhenrong Jia,Xiaofeng Wang,Fan Li
Microstructure control is critical to achieve thin film-based devices with high performance. The surface properties of the substrates on which thin films grow are expected to greatly influence the morphology and the resulting performance. Generally, homogeneous, dense and highly crystalline films are required. However, “island” like structures are usually obtained mainly due to the non-uniform nucleation. In this article, the self-assembling monolayer (SAM) strategy was applied to efficiently realize the uniform nucleation and modulate the microstructure of lead sulfide (PbS) thin films, which were fabricated on the modified ZnO-coated substrates with 3-mercaptopropionic acid (MPA) SAM via in-situ thermal decomposition of lead xanthate precursors. The results showed that PbS thin films with reduced pin-holes and uniform crystalline grains were fabricated with the incorporation of MPA SAM. More importantly, PbS thin films modulated by MPA showed better photoelectric response.
研究领域:
材料科学
·
薄膜技术
·
纳米材料
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）