CARBON
·
2019
·
IF 7.466
Sishi Long,Yunchao Feng,Faliang He,Shuaishuai He,Huachi Hong,Xuerui Yang,Lingling Zheng,Jian Liu,Lihui Gan,Minnan Long
Compressible and ultralight carbon aerogels are attractive due to its compressibility , elasticity and conductivity. However, it is still a great challenge to enrich the properties of carbon aerogel to meet various requirements. Herein, we report an untralight, supercompressible, fatigue resistant, superhydrophobic and fire-resistant and multifunctional CNF-GO/glucose-kaolin carbon aerogel (C-NGGK) carbon aerogel. To achieve such excellent performances, calcined GO , CNFs , glucose and kaolin are used for forming low-density and continuous wave-shape rGO layers, reinforcing the mechanical strength of carbon layers , realizing superelasticity and fatigue resistance and resulting in a superhydrophobic surface for C-NGGK, respectively. The as-prepared C-NGGK demonstrates excellent superhydrophobicity with the water contact angle (WCA) of 124.9°, and the absorption efficiency of the C-NGGK samples for different oils and organic solvents are 75–255 times their own weight. These advantages show that the C-NGGK can be an ideal candidate for oil/water separation. In addition, there is also the prospect to be used for pressure sensors , while other potential applications include three-dimensional electrode materials for supercapacitors and batteries , catalyst carriers and various wearable devices .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Asian Ceramic Societies
·
2020
·
IF 2.653
Mengmeng Yang,Jijia Li,Yiran Man,Zijun Peng,Xiaofang Zhang,Xudong Luo
A three-dimensional mullite-whiskers network ceramic with ultra-light weight and high-strength was obtained by the foaming gel-casting method with active mulllite powders and NH4F. Ultrafine active mullite powder was used as the raw material and SDS (sodium dodecyl sulfate) as a pore-forming agent. The effects of sintering temperature on the microstructure, flexural strength and thermal conductivity of the porous ceramics were systematically investigated. The mullite-whisker network porous ceramic has a fibrous-framework structure composed of interweaving mullite-whiskers. Because the pore-walls are composed of interlacing whiskers and the pores are filled with whiskers, the porous ceramics exhibited good mechanical properties and low thermal conductivity. The flexural strength of the obtained mullite-whisker porous ceramic sintered at 1500°C was up to 1.45 Mpa, while the porosity was as high as 89%. In addition, the thermal conductivity of the porous ceramic at room temperature was as low as 0.045 W/m⋅K.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 8
·490
·
IF 5
Minjie Hou,Qi Wang,Shunyu Wang,Zeze Yang,Xuefeng Deng,Hailong Zhao
Cellulose nanofibers (NF) were extracted from kapok fibers using TEMPO oxidation, followed by a combination of mechanical grinding and ultrasonic processing. The TEMPO-mediated oxidation significantly impacted the mechanical disintegration behavior of the kapok fibers, resulting in a high NF yield of 98%. This strategy not only improved the fibrillation efficiency but also reduced overall energy consumption during NF preparation. An ultralight and highly porous NF-based aerogel was successfully prepared using a simple ice-templating technique. It had a low density in the range of 3.5–11.2 mg cm−3, high compressional strength (160 kPa), and excellent thermal insulation performance (0.024 W m−1K−1). After silane modification, the aerogel displayed an ultralow density of 7.9 mg cm−3, good hydrophobicity with a water contact angle of 128°, and excellent mechanical compressibility with a high recovery of 92% at 50% strain. Benefiting from the silene support structure, it showed a high oil absorptive capacity (up to 71.4 g/g for vacuum pump oil) and a remarkable oil recovery efficiency of 93% after being reused for 10 cycles. These results demonstrate that our strategy endows nanocellulose-based aerogels with rapid shape recovery and high liquid absorption capabilities.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 16
·7930-7938
·
IF 3.3
Lingyun Wu,Liang Gao,JiaMing Li,Tianyu Wu,Dongli Chen,Zhou Manxi,Gang Sui
Adsorbent materials with high absorption capacity, stable mechanical properties, greenness and economy are highly desirable for efficient removal and recovery of oil from wastewater. Herein, an ultralight, low-cost and reusable hydrophobic aerogel of cellulose acetate/polyethylene oxide hybrid nanofibers was developed through thermal crosslinking and organosilicon modification. Through thermal crosslinking and an ice crystal template, a hierarchical pore structure was obtained which endowed the aerogel with mechanical stability and oil-absorption capacity. In addition, the structure was further strengthened after chemical vapor deposition of methyl trichlorosilane and good hydrophobicity (contact angle of 135.5°) can be realized. The surface-modified aerogel presented an ultralow density (8.74 mg cm−3), excellent resilience (completely recover to its original height after 50 compression cycles), high absorption capacity (weight gain of 63–128 g g−1) and reusability. Therefore, nanofibrous aerogels with outstanding compressive resilience and reusability make it promising to meet the increasing demand in the field of oil pollution cleaning.
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 ENGINEERING AND PERFORMANCE
·
2024
·
IF 2.2
Yang Wenqiang,Han Shanyu,Yin Yakun,Wang Zelong,Shi Wen,An Juan,Wang Hongdan,Xia Wentang
The production of ultralight copper powder (UCP) remains challenging due to the requisite ultralow apparent density coupled with a well-developed dendritic morphology, which greatly constrain the modulation and optimization of process parameters. In this study, we conducted a comprehensive investigation to gain deeper insights into the impact of these parameters on the performance of deposited UCPs. Our findings revealed the limitations of relying solely on conventional electrolytic parameters for tailored UCP production. To overcome this challenge, the introduction of hydrochloric acid into the electrolyte system was proposed. Upon which, remarkable improvements in UCP production were observed, including optimized dendritic morphology, enhanced current efficiency and reduced power consumption. By adjusting the amount of chloride addition, UCPs with tunable particle sizes and apparent densities were obtained. Under the benchmark factory process condition, the chloride-treated UCP exhibited an ultralow apparent density (0.47 g cm −3 ) and particle size (19.96 μm), considerably surpassing the corresponding figures for industrial copper powder (1.79 g cm −3 and 64.10 μm) and even the optimum values achieved by GGP Metalpowder AG for their UCP products (0.55 g cm −3 and < 63 μm), with 22.5% of the particles exhibiting simultaneously ultralight and ultrafine properties.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 31
·期 2
·637-647
·
IF 4.705
Li Dan,Liu Huipeng,Wang Ziwen,Zhang Zeqian,Wang Chengzhong,Zhao Biao,Pan Kai
Constructing 3-D nanomaterial-based adsorbents with good mechanical properties has attracted increasing attention. This paper reports a simple strategy to prepare ultralight and superelastic 3-D aerogels as efficient adsorbents for heavy metal Cr(VI) in wastewater by in-situ loading of polypyrrole on cellulose acetate nanofibers followed by freeze-drying method. The obtained aerogel possesses obvious 3-D porous and cross-linked structure, in which polypyrrole is uniformly coated on the nanofiber surface. Besides, the aerogel shows good mechanical properties with high compressive strength of 14.49 kPa, and can be processed into any desired shape. Especially, due to the presence of large specific surface area and high porosity, the obtained nanofiber aerogel shows significant Cr(VI) adsorption with maximum adsorption capacity of 244.65 mg/g. The present work proposes a high-quality nanofiber aerogel for efficiently adsorbing Cr(VI).
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
ADVANCED MATERIALS
·
2025
·
IF 26.8
Yanling Liu,Xinghai Pan,Zisong Zhou,Yuhang Xiao,Hao Mei,Sen Lin,Junhong Pu,Haolun Wang,Hui Wu
Flexible thermal protection is of great significance in fields facing various environments such as aerospace and electric vehicles. Elastic aerogels with micro-nanofibers as the base unit effectively solve the force-thermal compatibility, optimized the contradiction between mechanical strength and thermal insulation performance, and solves the risk of fragile aerogel. In order to develop elastic aerogels with lower density and better thermal insulation properties. Here, the first one-step preparation of ultralight polyimide microtube aerogel sponges (PMAS) using airflow-induced spinning is reported. PMAS consists of a large number of structurally controllable microtube, resulting in ultralight density (≈50 mg cm −3 ), ultralow thermal conductivity (37 mW m −1 ·K at 25 °C), and excellent elasticity and fatigue resistance, with no significant attenuation of the maximum stress after 1000 cycles of compression at 80% strain. In addition, PMAS has temperature-invariant dynamic mechanical stability and an operating temperature range from 77 to 573 K. These superior properties enable PMAS to be ideal choice for thermal insulation in extreme environments, thermal runaway in batteries, adsorption and gas filling. Airflow-induced spinning fills the gap in the industrial-scale preparation and material compatibility of microtube, while also providing a promising solution for the universal preparation of microtube structures.
研究领域:
材料科学
·
航空航天工程
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2022
·
IF 11.958
Zhenxing Du,Wenqiang Zuo,Penggang Wang,Wei She
Bubble-templated advanced cellular materials with ultralight and superior thermal insulation properties have shown great potential in energy-saving related applications. However, insufficient bubble stability severely limits the generation of such highly porous structures . Herein, we present an efficient method to produce ultra-stable aqueous foams by combing the amphiphilic Janus nanoparticle (Janus-SiO 2 ) with the surface-active polymer (hydroxypropyl methylcellulose). The life of aqueous foams is dramatically increased from 4 h to over 5 days with 5 wt% Janus-SiO 2 concentration. The dense adsorbed layer formed by the efficient adsorption of Janus-SiO 2 on the bubble film is the main factor for the outstanding foam stability. Owing to the greatly enhanced foam stability, we successfully produce ultralight cellular cement with hierarchical cellular structures and a density as low as 80 kg/m 3 . The ultralight cellular cement exhibits superior mechanical strength , robust fire resistance and excellent thermal insulation with a thermal conductivity as low as 0.038 W·m −1 ·K −1 . This work provides a practical approach for fabricating various advanced porous materials that employ bubbles as templates.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 90
·49000-49005
·
IF 3.708
Xun Song,Siwei Yang,Lin He,Shuai Yan,Fang Liao
In this paper, ultra-flyweight hydrophobic poly(m-phenylenediamine) aerogel (PmPDA) was fabricated via a simple two step approach from a poly(m-phenylenediamine) micro-spherical shell (PmPDMS). The PmPDA was first formed by freeze-drying and then cross-linked via the oxidative polymerization of surface groups following an annealing process. The PmPDA is hydrophilic before the annealing process and becomes hydrophobic (the contact angle is 103.7°) after it is annealed in air. Moreover, the obtained ultra-flyweight PmPDA (ρ = 0.8 mg cm−3) has a large surface area (338 m2 g−1), low thermal conductivity (0.0125 W m−1 K−1 at 25 °C) and excellent mechanical properties. Finally, the regenerated aerogels retain their original shape and ultrahigh absorption capability after more than 10 cycles, making PmPDA an ideal candidate for practical application in the absorption or removal of organics, particularly in environmental protection and pollution control.
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 ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Meng Zhou,Meng Yuan,Fangli Wu,Zhuowei Zhao,Heqing Fu
To expand the application range of electromagnetic interference (EMI) shielding materials, it has become an urgent issue to achieve the excellent shielding effectiveness (SE) in extreme environment. In this paper, an ultralight, compressible and superhydrophobic foam composed of melamine foam (MF), Ti 3 C 2 T x MXene and polydimethylsiloxane (PDMS) was constructed via the facile dipping and vacuum-assisted impregnation method. The MF as a skeleton can provide coated substrate for MXene sheets to realize the 3D conductive network. Meanwhile, the PDMS layer of MF/MXene/PDMS (MFMP) foam can enhance the stability and durability of its structure and capability. The obtained MFMP foam possesses the very low reduction (less than 10%) of compressive stress at a high strain of 60% after 200th compression cycles. More importantly, the MFMP foam also shows an ultrahigh absolute SE of 29088 dB cm 2 g −1 due to its excellent SE of 44.66 dB and ultralow density of 9.22 mg cm −3 . The retention rate of SE can be maintained over 85% under the different treatment of serve environment. This strategy offers a promising idea to construct the ultralight porous materials for highly efficient EMI shielding applications in damping and high humidity environment.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 28
·期 4
·1155-1165
·
IF 2.496
Liu Sha,Chen Weiwang,Zhou Xiaomeng
Polyimide (PI) aerogels with crosslinked structure are promising for diverse applications owing to their nano-porous nature and superior properties in many aspects. However, the crosslinkers used for preparing crosslinked PI aerogels are always laboriously available and expensive. The economical melamine therefore was chosen as a substitute in this study. It was proved that the use of melamine was indeed a viable strategy for effectively crosslinking PI chains. The resultant melamine-crosslinked PI (MPI) aerogels were tested to have relatively low shrinkage (as low as 9.96 vol%), ultralight bulk densities (0.084–0.116 g cm −3 ) and low thermal conductivity (< 40.0 mW m −1 K −1 ), together with considerable thermal stability (onset temperature to decompose up to 503 ℃) and acceptable compressive strength (Young’s modulus of 1.12–10.04 MPa). Meanwhile, the morphology and properties of MPI aerogels can also be tailored by regulating the proportion of hybrid diamines as well as the polymer concentration of pristine solution. Given all of these, MPI aerogels using melamine as an economical yet effective crosslinker will have a broad prospect in many fields including thermal insulation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Jian Chen,Jinbo Ouyang,Weixin Lai,Xiaohong Xing,Limin Zhou,Zhirong Liu,Wenqian Chen,Di Cai
A novel non-template method was used to prepare ultralight composite aerogel globules that were exploited for the removal of anti-inflammatory drug ketoprofen (KTP) from aqueous solution. The composite aerogel globules were synthesized by freeze-drying and characterized with FESEM, BET, FTIR, XRD and Zeta potential. Swelling behavior of these aerogel globules was strongly affected by the solution pH. The results showed that the presence of 10% activated biochar (ABC) in chitosan (CS), which was named CS-ABC2, was the most desirable aerogel globules as it had high mechanical property and remarkable sorption performance. The sorption kinetics and isotherms of KTP onto composite aerogel globules were studied in detail. In addition, the effects of ion strength and regeneration on sorption performance were investigated, indicating decent environment tolerance, complete recovery rate and excellent reusability of the composite aerogel globules. The composite aerogel globules also exhibited other outstanding advantages such as biodegradability, economy and ease of separation.
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
危险品化学品经营许可证（带存储）