Coatings made with water dispersions of different nano-particles of photocatalytic additives (titania and titania doped with iron and vanadium) were …
The presence of different polymers or other additives such as plasticizers causes a modification on the photo-degradation rate (for instance polyvinyl siloxane was more slowly degraded when having o-dioctyl phthalate (Horikoshi et al., 1998)) and thus this should be taken in consideration for the plastic synthesis and treatment processes ...
A detailed rheological study of aqueous solutions of methylhydroxyethylcellulose has been carried out in the presence of different acrylate-based graft polymer used as additive contents. Both polymer components are used in cement formulations to improve the flow performances of the concretes, but no physicochemical …
Titanium dioxide (TiO2) is the mostly commonly used photocatalytic additive in the range of 3–10% by cement weight. The review found that the photocatalytic concrete …
The photocatalytic property in concrete is achieved by the addition of photocatalytic material/additives such as titanium dioxide (TiO 2), zinc oxide (ZnO), …
Preparation method of cement-based photocatalytic materials. The incorporation of photocatalytic particles in concrete is still a challenge. Here, the main goal is the introduction of the maximum amount of catalyst at the material surface, …
Photocatalytic oxidation is one of the most active research areas related to the purification of environmental pollutants, mainly in the gas phase. This …
In HMC cements the presence of hydromagnesite, artinite, or dypingite as nucleation agent has been reported to increase the early reaction of MgO from slightly to considerably depending on the ...
The effects of elevated temperatures (140, 185, and 300°F. [60, 85, and 149°C]) at elevated pressure (up to appr oximately. 15 ksi [100 MPa]), as well as the effect of nanomaterial addition ...
1 Introduction. As the main energy source delivered from the extraterrestrial space, solar energy promises to surpass the annual global energy demand by a large margin. 1 Given the long predicted lifetime of the Sun, solar energy is also considered the ultimate renewable source that we can harvest on the planet of Earth. 2 The diurnal and …
There are two main types of Photocatalysis: a. Homogeneous Photocatalysis. b. Heterogeneous Photocatalysis. A. Homogeneous Photocatalysis. The homogeneous photocatalysis, involves the …
Abstract. Important developments in additive manufacturing of concrete (AMoC) have been achieved in the past decades. Like other additive manufacturing processes, interdependence between material design, process effects, and part performance exists in AMoC. In this chapter, material design of various cement-based …
Mortars with two different binders (Portland cement (PC) and high alumina cement (HAC)) were modified upon the bulk incorporation of nano-structured photocatalytic additives (bare TiO₂, and TiO₂ doped with either iron (Fe-TiO₂) or vanadium (V-TiO₂)). Plastic and hardened state properties of these mo …
COMBINED ADDITIVE EFFECTS ON PV OF 13 PPG SLURRY YP of 13 ppg cement slurries are show in Fig. 7. Fig. 7 shows that the YP readings were increasing with the addition of 1%Wt fluid loss control ...
It is shown that photocatalytic methods can significantly increase the speed and depth (up to complete mineralization) of decomposition processes of toxicants. The use of photocatalysis (PC) in the creation of low-power water treatment technologies is a promising direction in addressing environmental problems of the hydrosphere. 1. …
Furthermore, phosphorylated chitosan was reported to provide osteoinductivity to polymeric scaffolds [22] and even when used in low amount as an additive to bone cements [13]. The elaborated CCs–P composite material combining mainly calcium carbonate cement with some phosphorylated chitosan should be …
The current commercial technologies, such as TX Active ® and TioCem ® photocatalytic cement, containing TiO 2 particles can effectively remove various pollutants, including NO X, SO X, NH 3, CO, …
A cement sample prepared by adding 10% calcined dolomite (sedimentary rock associated with limestone) to a mixture of 87% clinker and 3% micronized TiO2 …
Calcium phosphate cements are currently receiving a great deal of interest especially for the hard tissue repair, augmentation, and regeneration applications due to their attractive ...
Photocatalysis represents a unique class of chemical transformations. It utilizes the energy delivered by light and drives reactions that are difficult, sometimes even impossible, to carry out in dark. When used for thermodynamically uphill reactions such as photosynthesis, photocatalysis promises a sustainable solution to large scale solar …
Among them, calcium phosphate cements, which are composed of a powder and a liquid that are mixed to obtain a moldable paste, are widely used. ... Wang X, Ma J, Wang Y, et al. Structural characterization of phosphorylated chitosan and their applications as effective additives of calcium phosphate cements. Biomaterials 2001; …
Photocatalysis is an important field of research and there are many practical applications including the use self-cleaning glass mentioned in Box 13.5.The topic of photocatalysis as applied to the removal of trace contaminant from water has been comprehensively reviewed by S. Malato, P. Fernández-Ibáñez, M.I. Maldonado, J. Blanco, and W. Gemjak, …
1. Introduction. The use of plastics brings great convenience to modern human life. As a type of man-made materials, plastics have the advantages of low cost, durability, light weight and wide applicability [1], resulting in the continuous growth of plastics demand and production in the past decades.Nowadays, more than 300 million tons of …
Bone cement, or polymethylmethacrylate (PMMA), has been used in surgical fixation of artificial joints for over 50 years. The primary function of bone cement is to transfer forces from bone to prosthesis. This review explores the development of bone cements, the role of bone cement additives, identifies applications and discusses future …
Summary. Visible light photocatalysis has become a powerful tool in organic synthesis that uses photons as traceless, sustainable reagents. Most of the activities in the field focus on the development of new reactions via common photoredox cycles, but recently a number of exciting new concepts and strategies entered less charted territories.
Photocatalysis, as a powerful tool for synthetic transformations, has the potential to impact industrial applications. In this commentary, we discuss the challenges and requirements with respect ...
Combination of photo- and organocatalysis for the activation of organic chlorides was developed using Ru (bpy) 3 Cl 2 ( 2a) and 4-methoxypyridine to carry out oxidation of benzyl halides (bromides ...
Photocatalysis is an ecofriendly technique that emerged as a promising alternative for the degradation of many organic pollutants. The weaknesses of the present photocatalytic system which limit their industrial applications include low-usage of visible light, fast charge recombination, and low migration ability of the photo-generated …
STANDARDS, PRACTICES and MANUALS ON ADDITIVE MATERIALS IN CEMENT CONCRETE. ACI PRC-130-19: Report on the Role of Materials in Sustainable Concrete Construction. ACI PRC-440-07 Report on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures. ACI PRC-229R-13 (22) Report on Controlled …
2. Dispersion of Nanomaterials in CBMS. The type and dosage of nanomaterials and the associated nanotechnology investigated in academic literature may differ from the realities in practice [].A main issue that hinders the application of nanomaterials in CBMS is their dispersion, which is crucial for the effectiveness of …