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You are here: Home / Archives for refractive index

Measurement of Concentration Dependence of Refractive Index to Enhance Gel Permeation Chromatography for Polymer Characterization

Measurement of Concentration Dependence of Refractive Index to Enhance Gel Permeation Chromatography for Polymer Characterization Author: Gabor Kiss Date: October 2019 Background: One of the workhorse techniques for polymer characterization is Gel Permeation Chromatography (GPC) which is used to measure molecular weight, molecular weight distribution, degree of branching, radius of gyration, solvent power, etc. The […]

Filed Under: Uncategorized, White Papers Tagged With: dn/dc, dndc, Gel Permeation Chromatography, GPC, refractive index

Refractive Index – RI Measurement of Solids & Films

RI Measurement of Solids and Films. RI measurement of solids and semi-solids is useful in labs for monitoring quality to insure consistency of transparency, pigmentation, or batch quality. RI might be measured on incoming materials or finished products. Highly accurate measurements are possible with the right refractometer and a method to measure the material. Instrument: […]

Filed Under: White Papers Tagged With: Films, glass, Plastic, R/I, refractive index, refractometer, resins, Semi-solids, silicone, Solids, Tape

Refractometer Uses in Industry and Selection

Refractometer Uses in Industry and Selection By Angelo DePalma, PHD A refractometer characterizes fluids based on their refractive index –the refraction occurs due to the change in the speed of light as it travels through a material of one density to one of different density. By definition a vacuum has a refractive index of 1, […]

Filed Under: White Papers Tagged With: Brix, laboratory, R/I, refractive index, refractometer, refractometers, refractometry

Refractometer Calibration – 2 Point Method

Refractometer Calibration, 2 point method, Rudolph Research J157 – Video Transcript Refractometer Calibration resource – for laboratory refractometer users utilizing a Rudolph Research Automatic Refractometer. Hi, I am John Ciccarella, Service manager of the most innovative line of refractometer instruments made today from Rudolph Research Analytical.   John Ciccarella , Rudolph Research, Service Manager with a […]

Filed Under: Uncategorized, White Papers Tagged With: calibrate, calibration, calibration fluid, digital, laboratory, R/I, refractive index, refractometer, refractometer calibration, refractometers

Refractometer Temperature Correction Vs Control

Refractometer Temperature Correction & Control Peter Marriott – Refractometer Product Manager Rudolph Research Analytical Also see video: Refractometer, Temperature Correction & Control with a Rudolph J457 We are going to look at the effects of changing temperature on refractive index measurement and if Temperature Correction can compensate for temperature variances or if actual temperature control […]

Filed Under: White Papers Tagged With: ABBE, Automatic, benchtop, beverage, Brix, chemical, cosmetics, digital, electronic, essential oils, flavor, food, industry, laboratory, oil, petro chemicals, petroleum, pharmacuetical, R/I, refractive index, refractometer, refractometers, sugar, Temperature Correction

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