resist.total: Calculate overall pipette tip resistance In breakage: SICM pipette tip geometry estimation

Description

Calculates the resistance of a pipette tip, as the sum of its internal conical resistance and external access resistance. Pipette geometry is specified in terms of length, tip radius and half-cone angle.

Usage

 `1` ```resist.total(r, l, theta, rho = 51) ```

Arguments

 `r` Pipette tip (inner) radius, in microns. `l` Pipette length, in microns. Note that resistance contribution falls of markedly away from the tip, so the exact length may not be crucially important. `theta` Pipette internal half-cone angle, in radians. `rho` Resistivity of the pipette filler medium, in ohm centimetres. The default value of 51 ohm cm corresponds to a 150 mM solution of KCl.

Value

The calculated total resistance, in ohms.

Author(s)

Matthew Caldwell

`resist.access`, `resist.cone`, `resist.breakage`

Examples

 ```1 2 3 4``` ```# total resistance for a 30 micron long pipette tip with a half-cone angle of 4 degrees # and a tip radius of 50nm, with a filler/bath resistivity of 64 ohm cm # converting result from ohms to megohms for readability resist.total(r=0.05, l=30, theta=4*pi/180, rho=64) * 1e-6 ```

Example output

```Loading required package: Imap
[1] 60.10974
```

breakage documentation built on May 1, 2019, 11:30 p.m.