Effect of Alkyl Benzene Sulfonate Surfactant on Morphology and Structure of Calcium Silicate Hydrate †

doi:10.7503/cjcu20190205

Abstract

Abstract:

The effects of the concentrations of SDBS, Ca ²⁺ and Si $O 3 2 -$ ions, stirring and reaction time on the dispersibility and morphology of calcium silicate hydrate(CSH) using sodium dodecylbenzene sulfonate(SDBS) as template were investigated, the formation mechanism of different CSH spherical shell morphology features was prpposed. The results showed that the crystallinity and polymerization degree of CSH increased and the relative content of Q ² structure increased with the increase of Na₂SiO₃ 9H₂O concentration, SDBS concentration and reaction time, the concentration of Na₂SiO₃ 9H₂O and SDBS were the main controlling factors. The spherical micelles formed by SDBS in solution have a strong template action, which effectively changes the crystal growth mode of CSH. By adjusting the concentration of SDBS and the ratio of calcium to silicon and appropriately prolonging the growth time of CSH, the CSH product with complete spherical shell, good disper-sibility and high stability can be obtained.

Key words: Calcium silicate hydrate, Spherical shell, Morphology, Dispersibility, Sodium dodecylbenzene sulfonate(SDBS)

CLC Number:

O614
O647

TrendMD:

WANG Yue, GUO Xiaohong, ZHOU Guangdong, CHENG Tiexin. Effect of Alkyl Benzene Sulfonate Surfactant on Morphology and Structure of Calcium Silicate Hydrate ^†[J]. Chem. J. Chinese Universities, 2019, 40(9): 1795.

Figures/Tables 11

Group	Name of the product	$c Ca (N O 3) 2$ /(mmol·L^-1)	$c N a 2 Si O 3$ /(mmol·L^-1)	c_SDBS/(mmol·L^-1)	Reaction time/d	Stirring or not
1	#Si4	5.0	4.0	2.0	1	Yes
	#Si5	5.0	5.0	2.0	1	Yes
	#Si6	5.0	6.0	2.0	1	Yes
	#Si8	5.0	8.0	2.0	1	Yes
	#Si10	5.0	10.0	2.0	1	Yes
2	#SDBS2	0.005	12.5	2.0	10	Yes
	#SDBS4	0.005	12.5	4.0	10	Yes
	#SDBS6	0.005	12.5	6.0	10	Yes
	#SDBS10	0.005	12.5	10.0	10	Yes
3	#t1	5.0	5.0	2.0	1	Yes
	#t2	5.0	5.0	2.0	2	Yes
	#t4	5.0	5.0	2.0	4	Yes
	#t20	5.0	5.0	2.0	20	Yes
4	#r1	5.0	5.0	2.0	1	Yes
	#r2	5.0	5.0	2.0	1	No
	#r3	5.0	5.0	3.0	1	Yes
	#r4	5.0	5.0	3.0	1	No

Group	Name of the product	$c Ca (N O 3) 2$ /(mmol·L^-1)	$c N a 2 Si O 3$ /(mmol·L^-1)	c_SDBS/(mmol·L^-1)	Reaction time/d	Stirring or not
1	#Si4	5.0	4.0	2.0	1	Yes
	#Si5	5.0	5.0	2.0	1	Yes
	#Si6	5.0	6.0	2.0	1	Yes
	#Si8	5.0	8.0	2.0	1	Yes
	#Si10	5.0	10.0	2.0	1	Yes
2	#SDBS2	0.005	12.5	2.0	10	Yes
	#SDBS4	0.005	12.5	4.0	10	Yes
	#SDBS6	0.005	12.5	6.0	10	Yes
	#SDBS10	0.005	12.5	10.0	10	Yes
3	#t1	5.0	5.0	2.0	1	Yes
	#t2	5.0	5.0	2.0	2	Yes
	#t4	5.0	5.0	2.0	4	Yes
	#t20	5.0	5.0	2.0	20	Yes
4	#r1	5.0	5.0	2.0	1	Yes
	#r2	5.0	5.0	2.0	1	No
	#r3	5.0	5.0	3.0	1	Yes
	#r4	5.0	5.0	3.0	1	No

Fig.1 XRD patterns of CSH prepared under different experimental conditions (A) Standard pattern of CSH; (B) a. #Si4, b. #Si5, c. #Si6, d. #Si8, e. #Si10; (C) a. #SDBS2, b. #SDBS4, c. #SDBS6, d. #SDBS10; (D) a. #t1, b. #t2, c. #t4, d. #t20; (E) a. #r1, b. #r2, c. #r3, d. #r4.

Fig.2 Schematic diagram of structure model of CSH[29]

$ν ˙$ /cm^-1	Assignment	$ν ˙$ /cm^-1	Assignment
455-463	δ(Si-O-Si)	816-818	ν(Si-O)Q¹
652-667	ν_s(Si-O-Si)	970-984	ν(Si-O)Q²

$ν ˙$ /cm^-1	Assignment	$ν ˙$ /cm^-1	Assignment
455-463	δ(Si-O-Si)	816-818	ν(Si-O)Q¹
652-667	ν_s(Si-O-Si)	970-984	ν(Si-O)Q²

Fig.3 FTIR spectra of CSH under different experimental conditions (A) a. #Si4, b. #Si5, c. #Si6, d. #Si8, e. #Si10; (B) a. #SDBS2, b. #SDBS4, c. #SDBS6, d. #SDBS10; (C) a. #t1, b. #t2, c. #t4, d. #t20; (D) a. #r1, b. #r2, c. #r3, d. #r4.

Fig.4 SEM images[(A1-E1), (A2-E2)] and EDS patterns(A3-E3) of CSH prepared with different Na2SiO3·9H2O concentrations (A1)-(A3) #Si4; (B1)-(B3) #Si5; (C1)-(C3) #Si6; (D1)-(D3) #Si8; (E1)-(E3) #Si10.

Fig.5 SEM images[(A1-D1), (A2-D2)] and EDS patterns(A3-D3) of CSH prepared with different SDBS concentrations (A1)-(A3) #SDBS2; (B1)-(B3) #SDBS4; (C1)-(C3) #SDBS6; (D1)-(D3) #SDBS10.

Fig.6 SEM images(A1, B1) and EDS patterns(A2, B2) of CSH prepared with different reaction time (A1), (A2) #t4; (B1), (B2) #t20.

Fig.7 SEM images[(A1-D1), (A2-D2)] and EDS patterns(A3-D3) of CSH prepared with stirring or not (A1)-(A3) #r1; (B1)-(B3) #r2; (C1)-(C3) #r3; (D1)-(D3) #r4.

Fig.8 SEM images(A1, A2) and EDS patterns(A3) of CSH prepared without SDBS

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