Hectorite clay

R. B. Carpenter, J. B. Bloys, and D. L. Johnson. Cement composition containing synthetic hectorite clay. Patent WO 9902464,1999. 

Jaynes WF, Vance GF (1999) Sorption of benzene, toluene, ethylbenzene and xylene (BTEX) compounds by hectorite clays exchanged with aromatic organic cations. Clays Clay Miner 47 358-365 Johnston CT, De Oliveira MF, Teppen BJ, Sheng G, Boyd SA (2001) Spectroscopic study of nitroaromatic-smectite sorption mechanisms. Environ Sci Technol 35 4767-4772... 

Other mineral additives have been used for many years as functional extenders and fillers in adhesives and sealants. These include kaolin (hydrated aluminum silicate), bentonite (hectorite clay), talc (magnesium silicate), and attapulgite (hydrated magnesium aluminum silicate) additives.1213 Kaolin and talc are considered to be viscosity thickeners whereas attapulgite is more of a conventional thixotrope. They are considered to be very cost-effective rheological additives. 

Visible light-induced cleavage of water has been reported for a mixed colloidal clay system consisting of a mixture of sepiolite clay-Ru02-Ru(bpy)3 + colloid (for O2 production) and Al,cEui (OH)3-Pt colloid (for H2 production) [165]. A turnover number of 20 with respect to the sensitizer, Ru(bpy)3 +, was observed. It was reported that the gas (H2 + O2) evolution displayed a damped oscillatory behavior. Photo-oxidation of water by tran5-diaqabis-(2,2 -bipyridine)ruthenium(2- -) adsorbed on the surface of hectorite clay has also been reported [166]. 

Bentonite and hectorite clays consist primarily of hydrated aluminum and magnesium silicates, respectively. Bentonite is recognized for its swelling capacity one gram can absorb up to 11 ml of water. A commonly used smectite clay is aluminum magnesium... 

Laponite, a synthetic hectorite clay, when suspended in water, forms disclike particles with a thickness of 1 nm, a diameter of about 25 nm, and a negative surface charge density stabilizing dispersions in water. Formation of a cross-linked polymer network using a small amount of Laponite indicates that these nanoparticles act as a multifunctional cross-linker with a large effective functionality (Okay and Oppermann 2007). 

Percbem . [Akzo] Montmorillonite or hectorite clays riieological additives, gellant, antiset g agent, viscosifier. 

Furukawa, T. and G. W. Brindley. 1973. Adsorption and oxidation of benzidine and aniline by montmorillonite and hectorite. Clays Clay Min. 21 279-288. 

Figure 18. XPS survey scan of titania/PVA expanded hectorite clay.

CAS 12173-47-6 EINECS/ELINCS 235-340-0 Synonyms Hector clay Hectorite clay... 

Trade Names Containing Bentone EW Bentone LT Hectorite clay. See Hectorite... 

Hectorite clay. See Hectorite Hedeoma oil Hedeoma pulegiodes Hedeoma pulegiodes oil. See Pennyroyal (Hedeoma pulegiodes) oil... 

Most commercial organoclays are made from mont-morillonite or hectorite. Clays are also referred to as bentonites. This is actually the name given to the ore from which the smectites are extracted. 

An alkylaryl ammonium hectorite clay, from the BENTONE series may be also used as additive. The clay provides excellent mechanical strength, flame retardancy and highly improved gas barrier properties (32). 

Moncada, E., Quijada, R., and Retuert, J. 2007. Comparative effect of metallocene and Ziegler-Natta polypropylene on the exfoliation of montmorillonite and hectorite clays to obtain nanocomposites. Journal of Applied Polymer Science 103 698-706. 

Chemical Description Reaction product of hectorite clay and stearalkonium chloride Trade Name Bentone 27... 

Pinnavaia et al. described the bonding of the pillars to the hectorite clay sheets, upon calcination, as a layer cross-linking mechanism [57]. Si and Al MAS-NMR data on Al-pillared smectite clays indicated the existence of two mechanisms for the linking of the pillars to the clay sheets. It was shown that the layer composition of the host clay plays a very important role in determining the layer reactivity upon heating. 

Whorlow (1992) published a book on rheological techniques that inctudes dynamic tests and wave propagation tests. In the appendix, he listed a number of rheologicat inves-tigahon equipment manufacturers. Some of the techniques appiy more to polymers and are not relevant to our discussion. Dynamic vibration tests have been extended to fresh concrete (Teixera et at., 1998). Concord and Tassin (1998) described a method to use rheo-ophcs for the study of thixotropy in synthetic clay suspensions. A rheometer optical analyzer was used on laponite, a synthetic hectorite clay. Laponite was mixed with water and tests were conducted at various intervals for up to 100 days. Rheo-ophcs seems to be... 

Walls, H. J., M. W. Riley, R. R., Singhal, R. J. Spontak, P. S. Fedwik, and S. A. Khan, 2003. Nanocomposite electrolytes with fumed silica and hectorite clay networks Passive versus active filters. Adv Func Mater 13 710-17. 

Xiong, L., Hu, X., Liu, X., Tong, Z., 2008. Network chain density and relaxation of in situ synthesized polyaciylamide/hectorite clay nanocomposite hydrogels with ultrahigh tensi-hility. Polymer 49, 5064—5071. 

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