Possibly yes. Certainly not just mix of H2O molecules with a few molecules split into H+ and -OH ions.
From:
http://www.sciforums.com/showpost.php?p=1900272&postcount=98 (18June2008):
"
Here are a few words to help you (and others) understand water better:
Water is really xH2O where x is a distribution of small integers. This is because both the hydrogens are on the same side (separated by 105 degree) of the oxygen. Their electrons spend much more time near the O than near the H, which are basically just positive proton "bumps" electrostatically bound to the now negative O ion.
Two H2O can thus easily join in a chain with the O ion of one "nestled" between the two proton "bumps" of the other. In this case, x = 2. This x= 2chain can grow and x > 10 occurs until the water is very hot. The average value of x increases with cooling as the thermal collisions with sufficient energy to break the longer chains are less frequent. I.e. at low temperatures the average x of the distribution of x is larger. I am nearly sure "vigorous shaking" of (or passing very high frequency sound waves thru) water would change the distribution of x while this "non-thermal" energy source is available to break the longer (x >10) chains into two shorter ones. I.e. shift the distribution of x to that corresponding to a higher temperature than the true temperature. Once this non-thermal energy source is terminated, then in less than a second, the distribution of x would return to be than corresponding to the true temperature.
Below 4 degrees, the chains are so long that as they are jumbled together significant voids occur. These voids occupy an increasing percent of the volume of the container. So the water stops contracting with temperature and begins to expand as the temperature decreases below 4 C. I forget the correct value for the density of 0 degree water, but it is more than that of ice but less than that 4 degree C water. - Water's densest temperature."
And below is from:
http://www.sciforums.com/showpost.php?p=1900470&postcount=104 (same day)
H2O not only forms short chains of various length but can disassociate into positive protons, +, and hydroxyl radicals, -OH. If I remember correctly the pH of pure water is 7 where pH is the negative log of the hydrogen ion (proton) concentration. I think that 7 means that in pure water the percent that is protons is 10^-7. By logic and assuming that is correctly remembered, then when you add something to water that also liberates protons , for example H2SO4, the there will be more free protons. If 100 times more, then the concentration would climb top 10^-5 and the pH would be 5. (I can never remember if less than 7 is an acidic or a base, but working it out from the definition is easy and hopefully correct here.)
I assume that a few of the xH2O chains do tend to have a net positive charge, a proton, weakly bound on the "head of the chain." i.e. the leading O ion has an extra proton bound to it for a total of 3, on rare occasions. {Added now: Or be negative with a -OH ion instead of the negative O end of another H2O molecules "nestled" between the two proton bumps. It is also possilbe that both happen and the chain is neutral and not be as "Polar."}
I do not know if it actually happens but if x is great enough, as water is polar (for reasons explained in my prior post {98 above now}) I would also suppose that there could briefly be bent chains that close on themselves to form very small loops or circles. Never have heard / read of this, but it does seem possible. As they would be self-stressed by the curvature there is probably a minimum x for this to be possible and they would break with collisions more easily that the open ended chain of the same x value, I would think.
{Inserted now: When I wrote this I was only "thinking in 2D." I now realize that each of the positive proton "bumps" of one H2O molecule could have its own negative O of another (pair) of H2O molecules attached electrostatically, IF these two had their triangular planes roughly parallel and both were roughly orthogonal to the first H2O molecule (the one “owning” the two H protons). I.e. not only 2D chains but very complex 3D structures with two different H2Os joined to the same H2O are possible (and likely). Some of these shapes may be relatively stable thermicly. Some of these shapes may mimic the shape of molecules with therapeutic properties.
It is well accepted that on cell surfaces there are many different selective sites and that they mainly select by shape, not what the 3D molecule that has "their shape" happens to be made of. For example, most of the drugs block heroin do so by having the same shape and occupying sites the heroin would. Likewise many drugs in development have a shape to fit some specific site, found only on cancerous cells, with perhaps a toxin attached to that shape, etc. Shape is more important than chemistry in some biological processes. Thus, homeopathic medicine may not be “pure nonsense” if water can be induced to take certain desired AND STABLE shapes.)}
If I were to search experimentally for evidence of these “tiny water donuts,” it would be in water at about 1 degree C or less. Perhaps a careful study of the scattering or absorption of sound would show a slight inflection in the value (of absorption or scattering coefficients) as a function of sound wave length nears a wavelength that resonates with the smallest possible closed loop? Also interesting to think about is possible enhancement of the “anti-stokes” line in laser scattering from water subject to strong sound waves with wave lengths in this region. Perhaps something resembling NMR (now called MRI, as the word “nuclear” in the original name, scared people) could be used to observe these tiny donuts. Perhaps even just very careful measurement of the AC dielectric constant as a function of frequency would show their effect. The nice thing about all of these attempts is the effect, if any is observed should weaken as the temperature is increased and these tiny donuts are destroyed by collisions. "
SUMMARY & COMMENTS:
Pure Water is a VERY COMPLEX SUBSTANCE containing many dynamically changing molecules of various molecular weights. I strongly doubt it, but it is even possible that by adding molecular scale substrate to bias the size and form of the molecules that do form, some new stable shapes could assemble on these surfaces.
I.e. homeopathic ideas may not be entirely nonsense, but the idea that the homeopathic therapeutic strength INCREASES with dilution surely is; however that is mainly a misunderstanding of how "homeopathic dilution" is achieved. (They do NOT just add more water. - I will not go into more details, which are easy to find, as that could give the impression I am somehow supporting homeopathic medicine, which I am not. -I know of no serious scientific evidence that it has more than placebo effect.)