قارن الطرق

	تشتت الضوء الديناميكي	التحليل الوزني الحراري
المجال	علم المواد	علم المواد
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1964	1960s
صاحب الطريقة	Robert Pecora	William W. Wendlandt
النوع	Measurement method	Characterization method
المصدر التأسيسي	Pecora, R. (1964). Spectral distribution of scattered light from a suspension of particles. Physica, 30(11), 2055-2070.	Wendlandt, W. W. (1986). Thermal Analysis (3rd ed.). John Wiley & Sons.
الأسماء البديلة	DLS, photon correlation spectroscopy, particle size measurement	TGA, thermal gravimetry, thermogravimetry
ذات صلة	3	3
الملخص	Dynamic Light Scattering (DLS), also known as Photon Correlation Spectroscopy (PCS), is an analytical technique for determining the size and size distribution of particles suspended in fluids by analyzing the time-dependent intensity fluctuations of scattered laser light. Developed by Robert Pecora in 1964, DLS exploits the Brownian motion of particles: smaller particles move faster, causing faster intensity fluctuations; larger particles move slower, causing slower fluctuations. By correlating intensity over time, particle size is deduced. DLS is rapid, non-destructive, and requires minimal sample volume, making it the standard technique for characterizing nanoparticles, proteins, colloids, and emulsions.	Thermogravimetric Analysis (TGA) is a thermal characterization technique that continuously measures mass loss or gain of a material as a function of temperature (or time at constant temperature). Developed systematically by William Wendlandt and colleagues in the 1960s, TGA identifies thermal transitions (evaporation, decomposition, oxidation, reduction) and quantifies composition of polymers, pharmaceuticals, ceramics, and other materials. The derivative signal (DTG) highlights transition temperatures. When combined with gas analysis (MS, FTIR), decomposition products are identified.