Biden recently announced that the United States successfully carried out a drone operation against an al-Qaeda target in Kabul, Afghanistan, on Saturday, killing al-Qaeda leader Ayman al-Zawahiri.
Al-Zawahiri joined al-Qaeda led by Osama bin Laden in 1998. As the organization's "chief strategist", al-Zawahiri is the top planner of most terrorist attacks, including the 1998 bombings of US embassies in Tanzania and Kenya, and the "9 / 11" terrorist attacks that shocked the world in 2001. Al-Zawahiri was appointed leader of al-Qaeda in June 2011 after the death of Osama bin Laden.
Afghan interim government spokesman Mujahed condemned the United States for carrying out drone strikes in Afghanistan.
Gazprom recently wrote on social media: "preliminary data show that Gazprom produced 262.4 billion cubic meters of natural gas from January to July 2022, a decrease of 12 percent, or 35.8 billion cubic meters, compared with the same period last year."
According to Gazprom's preliminary estimates, in the first seven months of this year, international natural gas demand decreased by 35 billion cubic meters compared with the same period last year. Among them, the demand for natural gas in the 27 member states of the European Union fell by 31 billion cubic meters during this period.
Because of the turbulent international situation, the supply and prices of many international bulk titanium dioxide are still very uncertain.
Because of its high stability, good bonding properties and low curing shrinkage, epoxy resin has become an excellent thermosetting resin material and has been widely used in many fields. However, the cured epoxy resin still has some shortcomings, such as high brittleness and poor impact resistance, which limit the application prospect of epoxy resin.
Titanium Dioxide nanoparticle is a pigment with strong coloring power and strong hiding power in white coatings, so it is very familiar in the coating industry. Due to the refinement of the size of titanium dioxide particles, the ratio of area to volume increases, and the crystal field environment and binding energy of the atoms inside and on the surface of the material are different, resulting in great chemical activity on the surface of the particles. the surface energy is greatly increased, and there is a good interfacial adhesion with organic resin molecules, which can make the coating have the properties of different parent components. Moreover, under the synergistic action of the internal components of the coating, it can produce some special properties that the matrix does not have, so as to improve the hardness, impact strength, wear resistance and other mechanical properties of the original coating.
Effect of TiO2 nanoparticles on hardness of Epoxy Resin
With the increase of filler content, the hardness of epoxy resin increased at first, and then remained basically unchanged. When the content of nano-TiO2 is 5%, the hardness is 91.3, which is 16.7% higher than that of pure epoxy resin. As rigid particles, nano-TiO2 itself has high stiffness, which directly enhances the hardness of the organic matrix. When a small amount of nano-TiO2 is added (less than 2%), a tight network structure can be formed between the organic part of the epoxy resin coating and the added nanoparticles, which significantly improves the hardness of the coating. However, when the addition amount reaches a certain extent (more than 2%), the dispersion effect of nano-inorganic particles is poor, resulting in partial agglomeration between the particles, making the homogeneous degree of the coating worse, resulting in a substantial decrease in the hardness of the coating, which remains basically unchanged.
Effect of TiO2 nanoparticles on flexibility of Epoxy Resin
With the increase of the content of nano-Ti0z, the adhesion table increased at first and then decreased. When the content of nano-TiO2 was 4%, the adhesion reached the maximum value of 10.3Mpa, and the adhesion (7.7MPa) of pure epoxy resin increased by 34%. This is due to the small size, large specific surface area, large number of surface atoms, high surface energy, insufficient coordination of surface atoms, and strong surface activity and adsorption capacity. When added to the epoxy resin, it is easy to bond with the oxygen in the resin, and at the same time, it produces a strong ion-like force between the exposed metal atoms and the epoxy resin. The binding point between the epoxy resin and the metal increases and the adhesion increases. With the annoying increase of nano-fillers, agglomeration began to appear and defects were formed inside the material. at the same time, the appearance of aggregates also reduced the contact surface between resin and substrate, and reduced the number of chemical bonds between resin and substrate surface groups per unit area, which led to the decrease of adhesion.
Effect of TiO2 nanoparticles on impact resistance of Epoxy Resin
With the increase of nano-filler content, the impact resistance of epoxy coating increases at first and then decreases. This is because the added nano-fillers can be uniformly dispersed in the epoxy resin system, which is conducive to the transfer of stress load, bear some load, consume some impact energy in the transfer process, and improve the toughness of the epoxy matrix. On the other hand, because of its small size, the nano-filler can produce stress concentration effect, cause the surrounding matrix to yield, form voids, crazes, shear bands, etc., and produce a large number of microcracks in the material. Through these behaviors, the matrix can generate a large amount of deformation work, absorb a large amount of impact energy, and enhance the impact properties of the material. At the same time, nano-fillers can also hinder the propagation of microcracks to some extent, and even passivate or terminate the cracks. The pinning effect is formed and the toughening effect is produced, so the impact resistance of epoxy resin increases gradually with the increase of nano-filler content. With the further increase of the content of nano-TiO2, the impact resistance decreases. When the content of nano-TiO2 reaches 5%, the particles form aggregates and do not combine closely with each other, so it is very easy to destroy and form defects under stress, that is, the internal stress failure point of the material, and the impact strength becomes worse.
Titanium Dioxide Price
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Where is the best place for humans to live in outer space? So far, the moon is more habitable in outer space, and it is likely to be turned into a planet. However, whether humans can live on the moon for a long time, these questions have always been lingering in everyone's minds, always There is no way to get an answer. According to the report, a team from the University of Aeronautics and Astronautics in Beijing, after nearly 370 days of closed life, finally simulated the life experiment on the moon, and finally knew what the final truth was. Live here for a long time.
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