scholarly journals Versatile fabrication of a superhydrophobic and ultralight cellulose-based aerogel for oil spillage clean-up

2016 ◽  
Vol 18 (40) ◽  
pp. 28297-28306 ◽  
Author(s):  
Hui Zhang ◽  
Yuqi Li ◽  
Yaoguang Xu ◽  
Zexiang Lu ◽  
Lihui Chen ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Plasma Treatment ◽  
Low Density ◽  
High Mechanical Strength ◽  
Marine Oil ◽  
Highly Efficient ◽  
Modification Process ◽  
Physical Chemical ◽  
Oil Spillage ◽  
Silane Modification

To deal with marine oil spillage and chemical leakage issues, a highly efficient absorbent (cellulose based aerogel) with a low density (ρ < 0.034 g cm−3, φ > 98.5%) and high mechanical strength was fabricated via a novel physical–chemical foaming method, plasma treatment and subsequent silane modification process.

Silicate–CoNi–carbon triple shell sandwich structured composite hollow microspheres with low density boosted microwave absorption and high mechanical strength

2021 ◽  
Author(s):  
Zhenguo An ◽  
Jingjie Zhang
Keyword(s):  
Mechanical Strength ◽  
Microwave Absorption ◽  
Large Scale ◽  
Hollow Microspheres ◽  
Electromagnetic Properties ◽  
Low Density ◽  
High Mechanical Strength

Low density silicate–CoNi–carbon triple shell hollow microspheres with high mechanical strength and controllable electromagnetic properties were prepared on a large scale.

scholarly journals Altered Volcanic Tuffs from Los Frailes Caldera. A Study of Their Pozzolanic Properties

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5348
Author(s):  
Jorge Costafreda ◽  
Domingo Martín ◽  
Leticia Presa ◽  
José Parra
Keyword(s):  
Electrical Conductivity ◽  
Portland Cement ◽  
Mechanical Strength ◽  
Iberian Peninsula ◽  
Volcanic Glass ◽  
Petrographic Analysis ◽  
High Mechanical Strength ◽  
Physical Chemical ◽  
Strength Tests ◽  
Pozzolanic Properties

This work presents the results of the study of the physical, chemical, mineralogical and pozzolanic properties of the altered volcanic tuffs (AVT) that lie in the Los Frailes caldera, south of the Iberian Peninsula, and demonstrates their qualities as pozzolans for the manufacturing of mortars and pozzolanic cements of high mechanical strength. The main objective of this research is to show to what extent the AVTs can replace portland cement (PC) in mortars, with standardised proportions of 75:25% and 70:30% (PC-AVT). To achieve these objectives, three AVT samples were studied by a petrographic analysis of thin section (PATS), DRX, FRX and MEB. The pozzolanic properties were determined by three methods: electrical conductivity (ECT), chemical pozzolanicity tests (CPT) at 8 and 15 days and mechanical strength tests (MS) of the specimens at 2, 7, 28 and 90 days. Studies of a PATS, DRX, FRX and MEB showed that the AVT samples’ constitutions are complex where smectite (montmorillonite), mordenite, quartz, halloysite, illite, kaolinite, volcanic glass and lithic fragments coexist. The results of the ECT and CPT tests confirmed the pozzolanic properties of the samples analysed and proved an increase in mechanical strength from 2 to 90 days of testing.

Low-density graphene/carbon composite aerogels prepared at ambient pressure with high mechanical strength and low thermal conductivity

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 5197-5204 ◽  
Author(s):  
Kang Guo ◽  
Zijun Hu ◽  
Huaihe Song ◽  
Xian Du ◽  
Liang Zhong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Strength ◽  
Compression Strength ◽  
Ambient Pressure ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Low Density ◽  
High Mechanical Strength ◽  
Low Thermal Conductivity ◽  
Composite Aerogels

SEM and TEM pictures show that GNSs can be well-dispersed in a carbon matrix. The resultant composite CAs exhibited high compression strength and extremely low thermal conductivity of 0.028 W m−1 K−1.

scholarly journals CARACTERIZAÇÃO ANATÔMICA E DESCRIÇÃO FÍSICO-QUÍMICA E MECÂNICA DA MADEIRA DE Mimosa schomburgkii

FLORESTA ◽  
2017 ◽  
Vol 47 (4) ◽  
pp. 383 ◽  
Author(s):  
Luciano Junqueira Costa ◽  
Camila Batista da Silva Lopes ◽  
Matheus Fernandes de Carvalho Reis ◽  
Welliton Lelis Cândido ◽  
Bruno De Freitas Homem de Faria ◽  
...  
Keyword(s):  
Specific Gravity ◽  
Mechanical Strength ◽  
Basic Density ◽  
Raw Material ◽  
Mechanical Resistance ◽  
Extractive Content ◽  
Anisotropy Coefficient ◽  
High Mechanical Strength ◽  
Physical Chemical ◽  
Vessel Elements

O uso de madeira de espécies alternativas na construção civil é uma alternativa para reduzir a utilização concentrada em poucas espécies e evitar a falta de matéria prima no mercado. Diante do exposto, o objetivo deste estudo foi avaliar propriedades físicas, químicas, anatômicas e mecânicas da madeira de Mimosa schomburgkii visando identificar o seu potencial para o uso na construção civil. Foi utilizada a madeira de Mimosa schomburgkii, com idade de 33 anos. As características anatômicas avaliadas foram as dimensões dos elementos de vasos (diâmetro e frequência), dos raios (altura e largura) e das fibras (comprimento, largura total, espessura de parede e de lume). Foi determinada a constituição química com a quantificação do teor de extrativo, lignina e holocelulose.  Para a caracterização físico-mecânica, foram avaliadas a densidade básica e aparente, contrações, o coeficiente de anisotropia, a resistência à flexão estática, à compressão paralela às fibras, à tração paralela às fibras, ao cisalhamento e a dureza Janka (paralela e perpendicular às fibras). A madeira possui fibras libriformes, com comprimento médio de 1180 μm, sendo classificadas como curtas. A densidade básica da madeira é em média 0,80 g.cm-3 (alta densidade), o coeficiente de anisotropia, em média 1,74. A madeira apresenta elevada resistência mecânica, sendo classificada como pertencente à classe C 60. Pelos resultados obtidos no estudo, a madeira de jurema (Mimosa schomburgkii) apresenta aspectos estéticos atrativos e elevada resistência mecânica, sendo, portanto, indicada para uso na construção civil.Palavras–chave: Propriedades da madeira, construção civil, elevada resistência mecânica, alta densidade básica. AbstractAnatomical characterization and physical-chemical and mechanical description of Mimosa schomburgkii wood. The use of wood of alternative species in civil construction has been an option to reduce the concentrated use of few species and to avoid the lack of raw material in the market. The objective of this study was to evaluate the physical, chemical, anatomical and mechanical properties of Mimosa schomburgkii wood, in order to identify its potential use in civil construction. Mimosa schomburgkii wood, at the age of 33 years, was used. The anatomical characteristics evaluated were the dimensions of vessel elements (diameter and frequency), rays (height and width) and fibers (length, width, wall thickness and lumen thickness). The chemical constitution was determined with the quantification of extractive content, lignin and holocellulose. For the physical-mechanical characterization, it was evaluated the specific gravity and apparent density, contractions, anisotropy coefficient, static bending strength, compression strength parallel to grain, traction strength parallel to grain, shear strength and Janka hardness (parallel and perpendicular to grain). The wood has libriform fibers, average length of 1180 μm, and it is classified as short. The wood basic density is on average of 0.80 g.cm-3 (high density). The anisotropy coefficient is on average of 1.74. The wood presents high mechanical strength, being classified as C 60 class. From the results obtained in this study, the Mimosa schomburgkii wood presents attractive aesthetic aspects and high mechanical resistance. Therefore, this wood is indicated for use in civil construction.Keywords: Wood properties, civil construction, high mechanical strength, high specific gravity.

Multiscale bio-inspired honeycomb structure material with high mechanical strength and low density

2012 ◽  
Vol 22 (21) ◽  
pp. 10883 ◽  
Author(s):  
Xun Xu ◽  
Liping Heng ◽  
Xiaojuan Zhao ◽  
Jie Ma ◽  
Ling Lin ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Honeycomb Structure ◽  
Low Density ◽  
High Mechanical Strength

DMV 59

Alloy Digest ◽  
2009 ◽  
Vol 58 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract DMV 59 is the material of choice for a wide variety of applications where significant corrosion resistance and high mechanical strength is necessary. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-672. Producer or source: Mannesmann DMV Stainless USA Inc.

BOFORS 2RM2

Alloy Digest ◽  
1965 ◽  
Vol 14 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Low Temperature ◽  
Mechanical Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Cast Steel ◽  
Heat Treating ◽  
High Mechanical Strength ◽  
Temperature Performance

Abstract BOFORS 2RM2 is a hardenable stainless cast steel having good weldability, high mechanical strength and improved corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance and corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: SS-169. Producer or source: Aktiebolaget Bofors.

scholarly journals Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3574
Author(s):  
Pejman Heidarian ◽  
Hossein Yousefi ◽  
Akif Kaynak ◽  
Mariana Paulino ◽  
Saleh Gharaie ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Strain Sensors ◽  
Self Healing ◽  
Nano Materials ◽  
Strain Sensing ◽  
Ferric Ions ◽  
Research Activity ◽  
Adhesion Properties ◽  
High Mechanical Strength ◽  
The Moment

Electroconductive hydrogels with stimuli-free self-healing and self-recovery (SELF) properties and high mechanical strength for wearable strain sensors is an area of intensive research activity at the moment. Most electroconductive hydrogels, however, consist of static bonds for mechanical strength and dynamic bonds for SELF performance, presenting a challenge to improve both properties into one single hydrogel. An alternative strategy to successfully incorporate both properties into one system is via the use of stiff or rigid, yet dynamic nano-materials. In this work, a nano-hybrid modifier derived from nano-chitin coated with ferric ions and tannic acid (TA/Fe@ChNFs) is blended into a starch/polyvinyl alcohol/polyacrylic acid (St/PVA/PAA) hydrogel. It is hypothesized that the TA/Fe@ChNFs nanohybrid imparts both mechanical strength and stimuli-free SELF properties to the hydrogel via dynamic catecholato-metal coordination bonds. Additionally, the catechol groups of TA provide mussel-inspired adhesion properties to the hydrogel. Due to its electroconductivity, toughness, stimuli-free SELF properties, and self-adhesiveness, a prototype soft wearable strain sensor is created using this hydrogel and subsequently tested.

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