根据依数性计算碳点的分子量及其在估算表面吸附量上的应用

doi:10.3969/j.issn.2097-2806.2025.04.003

Abstract

Abstract:

Since the discovery of carbon dots （CDs） in 2004, the unique photoluminescence phenomenon of CDs has attracted widespread attention. However, the molecular weight of CDs has not been adequately quantified at present, due to CDs are atomically imprecise and their molecular weight distribution is broad. In this paper, a series of Pluronic-modified CDs were prepared and the structure of the CDs was briefly analyzed. Subsequently, a molecular weight measurement method based on colligative properties was developed, and the correction coefficient in the algorithm was briefly analyzed. The calculated molecular weight was applied to the determination of surface adsorption capacity. This work provided a method for averaging the molecular weight of atomically imprecise particulate materials, which is expected to provide new opportunities in related fields.

Key words: carbon dots, molecular weight, colligative properties, surface adsorption capacity

CLC Number:

TQ423

Ting Sun, Xinzhi Liang, Minghao Pang, Xia Xin, Ning Feng, Hongguang Li. The molecular weight of carbon dots calculated from colligative properties and their application in estimating surface adsorption capacity[J].China Surfactant Detergent & Cosmetics, 2025, 55(4): 422-429.

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References 30

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	d m/d t	p^s	p^m
40 ℃	0.171 12	1 253
50 ℃	0.297 65	1 733	1 765
55 ℃	0.398 17	2 000	2 112
60 ℃	0.534 64	2 533

	d m/d t	M_w	p^m	k
F127	0.469 95	12 400	2 340	408 177
F68	0.446 87	8 400	2 268	379 146
P123	0.464 72	5 800	2 324	206 862

	d m/d t	p^m	k	M_eq
F127-CDs	0.476 75	2 361	408 177	13 902
F68-CDs	0.463 39	2 319	379 146	10 425
P123-CDs	0.483 21	2 380	206 862	7 856

Samples	cmc/ （mol/L）	γ_cmc/ （mN/m）	pc₂₀	Γ_m/ （μmol/m²）	A_min/ nm²
F127-CDs	3.81×10^-5	32.89	3.32	0.78	2.12
F127	6.86×10^-4	36.50	2.63	0.54	3.08
F68-CDs	3.18×10^-4	39.89	2.52	0.65	2.56
F68	1.44×10^-4	46.31	1.92	0.33	5.07
P123-CDs	4.20×10^-7	35.54	3.34	3.70	0.45
P123	6.55×10^-7	36.44	3.56	2.16	0.77

The molecular weight of carbon dots calculated from colligative properties and their application in estimating surface adsorption capacity

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