A method is provided for determining the surface viscosity of a liquid in which a thread is formed from a drop of the liquid. The thread is lengthened and its minimum radius h.sub.0 is determined at multiple times between the thread formation and thread pinch-off. The minimum radius and associated time values are used to determine a linear relationship of minimum radius and time, with the coefficient of the linear relationship, or the slope X of the line in the linear relationship, corresponding to the surface viscosity μ.sub.s of the liquid according to one of the following equations:

[00001]$\begin{array}{cc}x=\frac{0.0709}{1+5B_{\mathrm{s0}/3h_0}},& \left(1\right)\end{array}$

where B.sub.s0=μ.sub.s/μR in which h.sub.0 is defined as above, R is the dimension of the feature on which the drop is provided and μ is the bulk viscosity of the liquid, or

[00002]$\begin{array}{cc}x=\frac{0.0304}{\mathrm{Oh}\left(1+5b_{\mathrm{s0}/3h_0}\right)},& \left(2\right)\end{array}$

in which Oh=μ/√{square root over (ρRσ)}, where μ and R are as defined above, ρ is the density of the liquid, and σ is the surface tension of the liquid without surfactants.

A method for determining interfacial tension of a hydrocarbon in a brine fluid, the method including injecting a first brine fluid into a test cell, the first brine fluid having an initial ionic composition, injecting a hydrocarbon fluid into the test cell, contacting the hydrocarbon fluid with the first brine fluid, forming a droplet, measuring the interfacial tension of the hydrocarbon fluid in contact with the first brine fluid, at least partially displacing the first brine fluid with an inert gas, measuring a ionic composition salinity of the displaced first brine fluid in an ionic chromatograph, and comparing the measured ionic composition salinity to the initial ionic composition.

A contact angle measurement system includes a housing that can hold a volume of a first fluid having a first density, an adjustable rock sample holder positioned within the housing, a fluid dropper attached to the housing, an image capturing a device, and a computer system. The holder can support a rock sample. An orientation of the holder relative to the housing is adjustable such that an outer surface of the rock sample is at a non-zero angle relative to a lower wall of the housing. When the orientation of the holder relative to the housing is such that the outer surface of the rock sample is at the non-zero angle relative to the lower wall, the fluid droplet traverses the outer surface of the rock sample. The image capturing device can capture images of the fluid droplet as the fluid droplet traverses the outer surface of the rock sample.

A method for determining interfacial tension of a hydrocarbon in a brine fluid, the method including injecting a first brine fluid into a test cell, the first brine fluid having an initial ionic composition, injecting a hydrocarbon fluid into the test cell, contacting the hydrocarbon fluid with the first brine fluid, forming a droplet, measuring the interfacial tension of the hydrocarbon fluid in contact with the first brine fluid, at least partially displacing the first brine fluid with an inert gas, measuring a ionic composition salinity of the displaced first brine fluid in an ionic chromatograph, and comparing the measured ionic composition salinity to the initial ionic composition.

A measurement system includes a detector configured to detect a contact state of a bubble with respect to a wall, the bubble being included in a fluid that is in contact with a wall, and a controller configured to acquire the state of at least one of the wall, the fluid, and the bubble based on the contact state of the bubble with respect to the wall.

A device for determining a position and/or an extension of a drop in a position determination space, where the device has a camera having an objective and a beam splitter in the recording area of the camera, and the device is designed in such a way that light coming from the position determination space can enter the objective of the camera along a first light path as well as along a second light path, where light along the first light path can be reflected at a first reflector element in the direction of the beam splitter and can be transmitted through the beam splitter towards the objective, and where light along the second light path can be reflected at a second reflector element in the direction of the beam splitter and can be reflected at the beam splitter towards the objective.

The present invention includes a needle connected to a urine container; a side of the needle is connected to the urine container, and the other side is a blunt end; a holder is mounted on a base, and the urine container is detachably mounted on the holder; a camera unit is mounted on the base, aiming at the blunt end; a light source is mounted on the base, emitting a detection beam; a processor unit is electrically connected to the camera unit; wherein when a sample urine in the urine container drips through the needle and forms a drop of urine, the detection beam passes through the drop of urine and travels into the camera unit; the processor unit receives an image of the drop of urine through the camera unit, and the processor unit instantly calculates a protein concentration of the drop of urine from the image.

A contact angle measurement system includes a housing, a rock sample holder positioned within the housing, a fluid dropper attached to the housing, and a sonicator attached to the housing. The holder can support a rock sample whose contact angle is to be measured. The fluid dropper is positioned relative to the holder to drop a fluid droplet on the rock sample when the rock sample is supported by the holder. The housing can transmit the sound wave to the fluid droplet on the rock sample, and the sound wave can sonically remove the fluid droplet from the rock sample.

Systems, methods, and computer program products for measurement of surface properties using a mobile device are described, the surface properties including interfacial (surface) tension, contact angle (static, advancing, or receding), solid surface energy, and rolling or sliding angle on an inclined surface. The system has a support adapted to receive a mobile device with a camera and a processor. A structure is coupled to the support that is adapted to removably receive measurement components. The measurement components are configurable to place a droplet or a bubble within a field of view of the camera. Software on the mobile device is configured to operate the camera to take an image of the droplet or the bubble within the field of view of the camera, and to determine one or more physical properties of the droplet or the bubble based on an analysis of the image.

The present invention relates to a method for determining the disintegration time of a film-shaped pharmaceutical dosage form and a disintegration testing device for use in such a method.