ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Weijun Ke,Guojia Fang,Jing Wang,Pingli Qin,Hong Tao,Hongwei Lei,Qin Liu,Xin Dai,Xingzhong Zhao
A perovskite solar cell with a thin TiO2 compact film prepared by thermal oxidation of sputtered Ti film achieved a high efficiency of 15.07%. The thin TiO2 film prepared by thermal oxidation is very dense and inhibits the recombination process at the interface. The optimum thickness of the TiO2 compact film prepared by thermal oxidation is thinner than that prepared by spin-coating method. Also, the TiO2 compact film and the TiO2 porous film can be sintered at the same time. This one-step sintering process leads to a lower dark current density, a lower series resistance, and a higher recombination resistance than those of two-step sintering. Therefore, the perovskite solar cell with the TiO2 compact film prepared by thermal oxidation has a higher short-circuit current density and a higher fill factor.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2014
·
IF 2.613
Runnan Zhang,Jinming Peng,Yanlei Su,Xiaochen Fan,Zhongyi Jiang,Xueting Zhao,Jiazhen Liu,Yafei Li,Jiaojiao Zhao
In this study, a green approach to prepare both porous and dense antifouling membranes was developed through solvent-free bulk polymerization of the casting solution containing 2-hydroxyethyl methacrylate (HEMA) and pre-dispersed silica nanoparticles in two glass sheets under pressure. Porous polyHEMA membranes were prepared via removing the silica nanoparticles embedded in the polymer matrix . Dense poly(HEMA/MAA)/SiO 2 membranes were fabricated by adding methacrylic acid (MAA) as co-monomer without removing the silica nanoparticles . Membrane thickness could be conveniently controlled by varying the distance between the two slide glasses. Field emission scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and water contact angle measurement were employed to characterize the morphology and surface chemical composition of the resultant membranes. The porous polyHEMA membranes exhibited high efficiency in purification of bovine serum albumin (BSA) from BSA/yeast solution while the dense poly(HEMA/MAA)/SiO 2 membranes exhibited high rejection of orange GII. Both porous membranes and dense membranes exhibited strong hydrophilicity as a result of hydrophilic monomer HEMA, leading to good antifouling properties.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Leiming Guo,Yazhi Yang,Yong Wang
Ultrafiltration membranes with relatively small pores are highly expected in various separation cases. As a flexible manner to efficiently tighten the pores, post modification provides a robust platform for preparing the desired membranes. However, the endeavor to pursue high permselectivity of the membranes has been made by paying close attention to the modification layers while the effects of the substrate membranes are generally overlooked. In this work, tight membranes with ultrahigh permeance were produced by coating polyethylenimine (PEI) on gradient nanoporous phenolic substrates. Cationic PEI was tightly deposited on the negatively charged phenolics via electrostatic deposition, thus reducing the effective pore sizes to ∼2.6 nm through a single-step coating. The gradient porous nanostructures still remained after PEI coating in the phenolic membranes. The coated membranes exhibited ∼4–45 times higher permeance than counterparts with similar rejections. As the cationic PEI was distributed on the membrane surface and pore wall after coating, the positively charged membranes thus produced were able to efficiently separate cationic dyes from water.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hongyu Yin,Zhoujun Wang,Xiang Zhang,Weifeng Zhao,Ran Wei,Changsheng Zhao
Chronic liver failure (CLF) and chronic renal failure (CRF) lead to toxins accumulation, severely impairing organ functions. To address this challenge, a Janus polyethersulfone (PES)-based architecture integrated dense membrane with porous monolith is developed, pioneering an approach for simultaneous plasma separation and toxins adsorption. The porous monolith, featuring high porosity about 83.3 % and substantial specific surface area about 102.06 m 2 /g, is prepared using the freezing-induced phase separation (FIPS) technique. The porous monolith is composed of polymer networks of PES and amphiphilic copolymer of poly (vinyl pyrrolidone-co-methyl methacrylate) (VM), as well as activated carbon. Among the various monolith, the PES 18 VM 5 C 2 exhibits the optimal balance of adsorption and anti-protein adhesion. The PES-VM-incorporated dense membrane with a controlled submicron pore size is constructed atop the PES 18 VM 5 C 2 . The dense membrane effectively blocks hemocytes and the porous monolith efficiently adsorbs toxins. Together, the Janus architecture PES 18 VM 5 C 2 @M 16 allows over 85 % of bovine serum albumin (BSA) to permeate, showcasing its selective permeability. After being integrated into a custom 3D-printed supporting device, the PES 18 VM 5 C 2 @M 16 achieves significant clearance in creatinine (67.6 %), uric acid (87.4 %), and bilirubin (89.1 %) during 2-hour plasma adsorption test, with minimal impact on essential plasma components such as total protein, albumin, and cholesterol. This work presents a “Janus Interface Architecture” as next-generation platform for plasma separation and toxins adsorption, offering a promising strategy for wearable artificial liver systems.
研究领域:
生物医学工程
·
材料科学
·
血液透析
·
血浆分离技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Tianrui Yang,Yu Liu,Jingyi Chen,Junsheng Liu,Shan Jiang,Xiaoxue Zhang,Chunyu Ji
Lead(II) is a potential carcinogen of heavy-metal ions (HIs). With the wide application of Pb-bearing products including lead alloy products, and new-energy lead-ion batteries, lead pollution has become a tricky problem. To solve such a difficulty, novel ultrathin MoS 2 -vinyl hybrid membranes (MVHMs) with a “spring” effect were synthesized via co-polymerization of acrylic acid, styrene and molybdenum disulfide (MoS 2 ) and their adsorptions for HIs were explored. The “spring” effect derived from the interaction between the tendency of the short polyacrylic acid (PAA) chain connected with MoS 2 to spread outward and the coulomb force between layers from MoS 2 (s-MoS 2 ), which enlarge the spacing of MoS 2 layers without changing the number of layers after membrane formation, which changes the swelling membrane to a dense membrane and reduces the original thickness from 0.5 cm to 0.011 mm in the thickness direction. The adsorption experiment revealed that these MVHMs had super adsorption performance and high selectivity for Pb 2+ by comparison with other five metal ions: Cu 2+ , Cd 2+ , Ni 2+ , Cr 3+ and Zn 2+ . Especially, the adsorption quantity of MVHMs for Pb 2+ could approach 2468 mg/g and the maximum adsorption ratio of q e [Pb 2+ ]/q e [Cu 2+ ] can reach 10.909. These values were much larger than the data obtained with the adsorbents reported in the last decade. A variety of models are applied to evaluate the effect of ionic groups. It was confirmed that –COOH plays a key role in adsorption of HIs and s-MoS 2 also has a certain contribution. Conversely, ion exchange plays only a minor role during the period of adsorption process. Effective diffusion coefficient (D eff ) of Pb(II) had the largest values among these metal ions. Hence, these hybrid membranes are promising adsorbents for the removal of Pb 2+ from water containing various ions.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 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）